from __future__ import annotations

import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parent
DEPS_DIR = ROOT / ".deps"
if DEPS_DIR.exists():
    sys.path.insert(0, str(DEPS_DIR))

import asyncio
import hashlib
import json
import logging
import os
import queue
import re
import secrets
import shutil
import tempfile
import threading
import uuid
from datetime import datetime, timezone
from threading import Lock
from typing import Any, AsyncIterator, Mapping
from urllib.parse import quote

from dotenv import load_dotenv
from fastapi import Depends, FastAPI, File, Form, HTTPException, Query, Request, Response, UploadFile
from fastapi.responses import FileResponse, JSONResponse, StreamingResponse
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel

import log_preanalysis


load_dotenv(ROOT / ".env")
DATA_DIR = ROOT / "data"
UPLOAD_DIR = DATA_DIR / "uploads"
AGENT_DIR = DATA_DIR / "agent_workspaces"
DB_FILE = DATA_DIR / "db.json"
STATIC_DIR = ROOT / "static"
db_lock = Lock()
logger = logging.getLogger("helpomatica")
AGENT_TIMEOUT_SECONDS = 180
SESSION_COOKIE = "helpomatica_session"
SESSION_DAYS = 30
PBKDF2_ITERATIONS = 200_000

# Parallel local agents: different chat_ids may run bridges concurrently.
# Per-chat still single-flight — one active run + at most one waiting request.
# (Optional future: CURSOR_USE_CLOUD=1 → Cloud Agents API for remote parallel runs.)
agent_status_lock = Lock()
active_runs: dict[str, dict[str, Any]] = {}
chat_queue_lock = Lock()
# chat_id -> {"running": bool, "waiting": int, "turn": threading.Event}
chat_queues: dict[str, dict[str, Any]] = {}


class CursorStartupError(RuntimeError):
    pass


def format_agent_error(error: Exception) -> str:
    message = str(error).strip()
    if message:
        return message
    return f"{error.__class__.__name__}: проверьте CURSOR_API_KEY и запуск через .\\run.ps1"


def now() -> str:
    return datetime.now(timezone.utc).isoformat()


def empty_db() -> dict:
    return {
        "users": [],
        "sessions": [],
        "projects": [],
        "chats": [],
        "messages": [],
        "files": [],
        "analysis_cache": [],
    }


def hash_password(password: str, salt: str | None = None) -> str:
    salt = salt or secrets.token_hex(16)
    digest = hashlib.pbkdf2_hmac(
        "sha256",
        password.encode("utf-8"),
        salt.encode("utf-8"),
        PBKDF2_ITERATIONS,
    )
    return f"{salt}${digest.hex()}"


def verify_password(password: str, stored: str) -> bool:
    try:
        salt, digest = stored.split("$", 1)
    except ValueError:
        return False
    candidate = hashlib.pbkdf2_hmac(
        "sha256",
        password.encode("utf-8"),
        salt.encode("utf-8"),
        PBKDF2_ITERATIONS,
    ).hex()
    return secrets.compare_digest(candidate, digest)


def public_user(user: dict) -> dict:
    return {
        "id": user["id"],
        "username": user["username"],
        "display_name": user["display_name"],
        "role": user["role"],
        "created_at": user["created_at"],
    }


def default_model() -> str:
    return os.getenv("CURSOR_MODEL", "auto").strip() or "auto"


def migrate_db(data: dict) -> dict:
    changed = False
    for key in ("users", "sessions", "projects", "chats", "messages", "files", "analysis_cache"):
        if key not in data or not isinstance(data[key], list):
            data[key] = []
            changed = True

    if not data["users"]:
        username = os.getenv("ADMIN_USERNAME", "admin").strip() or "admin"
        password = os.getenv("ADMIN_PASSWORD", "admin")
        admin = {
            "id": uuid.uuid4().hex,
            "username": username,
            "display_name": "Admin",
            "password_hash": hash_password(password),
            "role": "admin",
            "created_at": now(),
        }
        data["users"].append(admin)
        changed = True
        logger.info("Bootstrap admin user created: %s", username)
    else:
        admin = next((u for u in data["users"] if u.get("role") == "admin"), data["users"][0])

    admin_id = admin["id"]
    admin_name = admin.get("display_name") or admin.get("username") or "Admin"

    for project in data["projects"]:
        if "model" not in project:
            project["model"] = default_model()
            changed = True
        if "created_by" not in project:
            project["created_by"] = admin_id
            changed = True

    for chat in data["chats"]:
        if "created_by" not in chat:
            chat["created_by"] = admin_id
            changed = True
        if "updated_by" not in chat:
            chat["updated_by"] = admin_id
            changed = True

    chats_missing_order = [chat for chat in data["chats"] if "sort_order" not in chat]
    if chats_missing_order:
        by_project: dict[str, list[dict]] = {}
        for chat in data["chats"]:
            by_project.setdefault(chat["project_id"], []).append(chat)
        for project_chats in by_project.values():
            ordered = sorted(
                project_chats,
                key=lambda item: item.get("updated_at") or item.get("created_at") or "",
                reverse=True,
            )
            for index, chat in enumerate(ordered):
                if chat.get("sort_order") != index:
                    chat["sort_order"] = index
                    changed = True

    for message in data["messages"]:
        if "user_id" not in message:
            if message.get("role") == "user":
                message["user_id"] = admin_id
                message["author_name"] = admin_name
            else:
                message["user_id"] = None
                message["author_name"] = "Помощник"
            changed = True
        elif "author_name" not in message:
            if message.get("role") == "assistant":
                message["author_name"] = "Помощник"
            else:
                message["author_name"] = admin_name
            changed = True

    for file_entry in data["files"]:
        chat_id = file_entry.get("chat_id") or None
        if chat_id == "":
            chat_id = None
        scope = str(file_entry.get("scope") or "").strip().lower()
        if scope not in ("project", "chat"):
            # Legacy uploads had no chat_id: keep them global within the project.
            scope = "chat" if chat_id else "project"
        if scope == "chat" and not chat_id:
            scope = "project"
        if scope == "project":
            chat_id = None
        if file_entry.get("scope") != scope:
            file_entry["scope"] = scope
            changed = True
        if "chat_id" not in file_entry or file_entry.get("chat_id") != chat_id:
            file_entry["chat_id"] = chat_id
            changed = True

    if changed:
        save_db(data)
    return data


def load_db() -> dict:
    DATA_DIR.mkdir(exist_ok=True)
    UPLOAD_DIR.mkdir(exist_ok=True)
    if not DB_FILE.exists():
        save_db(empty_db())
    with db_lock:
        data = json.loads(DB_FILE.read_text(encoding="utf-8"))
    return migrate_db(data)


def save_db(data: dict) -> None:
    DATA_DIR.mkdir(exist_ok=True)
    with db_lock:
        temp_file = DB_FILE.with_suffix(".tmp")
        temp_file.write_text(
            json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8"
        )
        temp_file.replace(DB_FILE)


def find(items: list[dict], item_id: str, label: str) -> dict:
    item = next((entry for entry in items if entry["id"] == item_id), None)
    if not item:
        raise HTTPException(status_code=404, detail=f"{label} не найден")
    return item


def resolve_session(session_id: str | None) -> dict | None:
    if not session_id:
        return None
    data = load_db()
    session = next((s for s in data["sessions"] if s["id"] == session_id), None)
    if not session:
        return None
    user = next((u for u in data["users"] if u["id"] == session["user_id"]), None)
    return user


def get_current_user(request: Request) -> dict:
    user = getattr(request.state, "user", None)
    if not user:
        raise HTTPException(status_code=401, detail="Требуется вход")
    return user


def require_admin(user: dict = Depends(get_current_user)) -> dict:
    if user.get("role") != "admin":
        raise HTTPException(status_code=403, detail="Только для администратора")
    return user


# Cap workspace copies so a huge upload library cannot fill the temp disk.
MAX_WORKSPACE_FILE_BYTES = 40 * 1024 * 1024
MAX_WORKSPACE_TOTAL_BYTES = 80 * 1024 * 1024
_INVALID_WIN_NAME = re.compile(r'[<>:"/\\|?*\x00-\x1f]')
_RESERVED_WIN_NAMES = {
    "con", "prn", "aux", "nul",
    *(f"com{i}" for i in range(1, 10)),
    *(f"lpt{i}" for i in range(1, 10)),
}


def sanitize_workspace_filename(name: str) -> str:
    """Keep the original basename, including rotated logs like ``*.log.1``."""
    base = Path(name or "file").name.strip().replace("\x00", "")
    base = _INVALID_WIN_NAME.sub("_", base).strip(" .")
    if not base:
        base = "file"
    first, dot, rest = base.partition(".")
    if first.lower() in _RESERVED_WIN_NAMES:
        base = f"_{first}{dot}{rest}"
    if len(base) > 180:
        base = base[:180]
    return base


def unique_workspace_name(desired: str, used: set[str]) -> str:
    if desired.lower() not in used:
        used.add(desired.lower())
        return desired
    stem = Path(desired).stem
    suffix = Path(desired).suffix
    index = 2
    while True:
        candidate = f"{stem}_{index}{suffix}"
        if candidate.lower() not in used:
            used.add(candidate.lower())
            return candidate
        index += 1


def rank_files_for_workspace(
    files: list[dict],
    query: str,
    attachment_ids: list[str] | None = None,
) -> list[dict]:
    """Prefer message attachments, then files named in the query, then recent."""
    lowered = query.lower()
    keywords = {word for word in re.findall(r"[\w\u0400-\u04FF.+-]+", lowered) if len(word) > 2}
    attach_set = {fid for fid in (attachment_ids or []) if fid}

    def sort_key(entry: dict) -> tuple:
        attached = 1 if entry.get("id") in attach_set else 0
        name = entry.get("name", "").lower()
        mentioned = 1 if any(token in name for token in keywords) else 0
        created = entry.get("created_at") or ""
        return (attached, mentioned, created)

    return sorted(files, key=sort_key, reverse=True)


def _windows_long_path(path_text: str) -> str:
    """Expand Win32 8.3 short names (INWORK~1) to the real long path."""
    try:
        import ctypes
        from ctypes import wintypes

        get_long = ctypes.windll.kernel32.GetLongPathNameW
        get_long.argtypes = [wintypes.LPCWSTR, wintypes.LPWSTR, wintypes.DWORD]
        get_long.restype = wintypes.DWORD
        buf = ctypes.create_unicode_buffer(32768)
        n = get_long(path_text, buf, 32768)
        if n and n < 32768 and buf.value:
            return buf.value
    except Exception:  # noqa: BLE001
        pass
    return path_text


def agent_workspace_cwd(workspace: Path | str) -> str:
    """Absolute long-path cwd for Cursor bridge/agent (avoid Win32 8.3 short paths)."""
    try:
        resolved = Path(workspace).resolve()
    except OSError:
        resolved = Path(os.path.abspath(str(workspace)))
    text = str(resolved)
    if sys.platform == "win32":
        text = _windows_long_path(text)
    return text


def file_scope_of(entry: dict) -> str:
    scope = str(entry.get("scope") or "").strip().lower()
    if scope in ("project", "chat"):
        return scope
    return "chat" if entry.get("chat_id") else "project"


def iter_scoped_files(
    data: dict,
    project_id: str,
    chat_id: str | None = None,
) -> list[dict]:
    """Project-scoped files plus this chat's files. Unique by file id."""
    visible: list[dict] = []
    seen_ids: set[str] = set()
    for entry in data.get("files", []):
        if entry.get("project_id") != project_id:
            continue
        scope = file_scope_of(entry)
        if scope == "project":
            include = True
        elif scope == "chat" and chat_id and entry.get("chat_id") == chat_id:
            include = True
        else:
            include = False
        if not include:
            continue
        fid = entry.get("id") or ""
        if fid:
            if fid in seen_ids:
                continue
            seen_ids.add(fid)
        visible.append(entry)
    return visible


_ATTACHED_NAMES_RE = re.compile(
    r"\[Прикреплённые файлы проекта:\s*([^\]]+)\]",
    re.IGNORECASE,
)


def message_attachment_ids(messages: list[dict]) -> list[str]:
    ids: list[str] = []
    seen: set[str] = set()
    for message in reversed(messages):
        if message.get("role") != "user":
            continue
        for ref in message.get("attachments") or []:
            fid = str((ref or {}).get("id") or "").strip()
            if fid and fid not in seen:
                seen.add(fid)
                ids.append(fid)
    return ids


def message_attachment_names(messages: list[dict]) -> list[str]:
    names: list[str] = []
    seen: set[str] = set()
    for message in reversed(messages or []):
        if message.get("role") != "user":
            continue
        for ref in message.get("attachments") or []:
            name = str((ref or {}).get("name") or "").strip()
            key = name.lower()
            if name and key not in seen:
                seen.add(key)
                names.append(name)
        content = str(message.get("content") or "")
        match = _ATTACHED_NAMES_RE.search(content)
        if not match:
            continue
        for raw in match.group(1).split(","):
            name = raw.strip()
            key = name.lower()
            if name and key not in seen:
                seen.add(key)
                names.append(name)
    return names


def resolve_message_attachments(
    data: dict,
    project_id: str,
    chat_id: str | None,
    messages: list[dict] | None = None,
    attachment_ids: list[str] | None = None,
) -> list[dict]:
    """Resolve attached files by id, then by original basename (any scope)."""
    files = [
        entry
        for entry in data.get("files", [])
        if entry.get("project_id") == project_id
    ]
    by_id = {str(entry.get("id") or ""): entry for entry in files if entry.get("id")}
    found: list[dict] = []
    seen: set[str] = set()

    def add(entry: dict | None) -> None:
        if not entry:
            return
        fid = str(entry.get("id") or "")
        key = fid or str(entry.get("name") or "").lower()
        if not key or key in seen:
            return
        seen.add(key)
        found.append(entry)

    for fid in attachment_ids or []:
        add(by_id.get(str(fid)))
    for fid in message_attachment_ids(messages or []):
        add(by_id.get(str(fid)))
    for name in message_attachment_names(messages or []):
        key = name.lower()
        match = next(
            (
                entry
                for entry in files
                if str(entry.get("name") or "").lower() == key
                and (
                    file_scope_of(entry) == "project"
                    or not chat_id
                    or entry.get("chat_id") == chat_id
                )
            ),
            None,
        )
        add(match)
    return found


def dedupe_workspace_files(files: list[dict]) -> list[dict]:
    """Keep first occurrence per file id and per original basename."""
    seen_ids: set[str] = set()
    seen_names: set[str] = set()
    unique: list[dict] = []
    for entry in files:
        fid = entry.get("id") or ""
        if fid and fid in seen_ids:
            continue
        aliases = _workspace_name_aliases(entry)
        key = (aliases[0] if aliases else "file").lower()
        if key in seen_names:
            continue
        if fid:
            seen_ids.add(fid)
        seen_names.add(key)
        unique.append(entry)
    return unique


_UUID_PREFIX = re.compile(r"^[0-9a-f]{32}_", re.IGNORECASE)


def _strip_upload_uuid_prefixes(name: str) -> str:
    """Peel ``{32hex}_`` prefixes from upload storage names."""
    current = Path(name or "file").name
    while True:
        stripped = _UUID_PREFIX.sub("", current, count=1)
        if stripped == current:
            return current
        current = stripped


def _workspace_name_aliases(entry: dict) -> list[str]:
    """Prefer original/UI basename; if metadata is hashed-only, also expose bare name."""
    raw_name = str(entry.get("name") or entry.get("stored_name") or "file")
    preferred = sanitize_workspace_filename(_strip_upload_uuid_prefixes(raw_name))
    display = sanitize_workspace_filename(raw_name)
    ordered = [preferred]
    # When UI/db name is still ``{uuid}_file.gz``, keep that name as a secondary alias.
    if display.lower() != preferred.lower():
        ordered.append(display)
    return ordered or ["file"]


def _link_or_copy(source: Path, dest: Path) -> None:
    if dest.exists():
        return
    try:
        os.link(source, dest)
    except OSError:
        shutil.copy2(source, dest)


def prepare_agent_workspace(
    project: dict,
    data: dict | None = None,
    query: str = "",
    chat_id: str | None = None,
    attachment_ids: list[str] | None = None,
    messages: list[dict] | None = None,
) -> Path:
    """Create an isolated cwd and copy scoped uploads into it.

    The Cursor agent runs on the Helpomatica server machine. Client-PC paths
    are never available; only files from data/uploads/ for this project that
    are in scope (project-wide, or this chat) are placed under ./ and ./files/
    so tools can open them by relative name.

    Message attachments and chat-scoped files are always copied (no 40/80MB
    cap, no extension filter). Project-wide extras still use the size cap.
    Always return a resolved absolute long path so bridge/shell cwd is not an
    8.3 short path (e.g. ``C:\\Users\\INWORK~1\\...``), which confuses agents
    into leaving the temp workspace.
    """
    isolated_root = Path(agent_workspace_cwd(Path(tempfile.gettempdir()) / "helpomatica-agent"))
    isolated_root.mkdir(parents=True, exist_ok=True)
    # mkdtemp may return a short 8.3 path on Windows — resolve to long path.
    workspace = Path(
        agent_workspace_cwd(
            tempfile.mkdtemp(prefix=f"hlp-{project['id'][:8]}-", dir=isolated_root)
        )
    )
    files_dir = workspace / "files"
    files_dir.mkdir(exist_ok=True)

    if data is None:
        _write_workspace_hints(workspace, [], [])
        return workspace

    attachments = resolve_message_attachments(
        data, project["id"], chat_id, messages=messages, attachment_ids=attachment_ids
    )
    attach_ids = {str(entry.get("id") or "") for entry in attachments if entry.get("id")}
    attach_ids.update(str(fid) for fid in (attachment_ids or []) if fid)
    scoped = iter_scoped_files(data, project["id"], chat_id)
    others = [
        entry
        for entry in rank_files_for_workspace(scoped, query, list(attach_ids))
        if str(entry.get("id") or "") not in attach_ids
    ]
    # Attachments first (must land), then remaining chat-scoped, then project.
    chat_rest = [entry for entry in others if file_scope_of(entry) == "chat"]
    project_rest = [entry for entry in others if file_scope_of(entry) != "chat"]
    ordered = dedupe_workspace_files(attachments + chat_rest + project_rest)

    used_names: set[str] = {
        "readme.md",
        "project_files.md",
        "agents.md",
        "workspace_root.txt",
        ".cursorignore",
        "preanalysis.md",
    }
    copied_ids: set[str] = set()
    listing: list[str] = []
    notes: list[str] = []
    total_bytes = 0

    def place_copy(source: Path | None, primary: str, aliases: list[str]) -> None:
        dest_nested = files_dir / primary
        dest_flat = workspace / primary
        if source is None:
            stub = (
                f"# MISSING UPLOAD\n"
                f"Recorded as `{primary}` but the bytes are not on disk. "
                "Ask the user to re-upload this file.\n"
            )
            dest_nested.write_text(stub, encoding="utf-8")
        else:
            _link_or_copy(source, dest_nested)
        _link_or_copy(dest_nested, dest_flat)
        for alias in aliases[1:]:
            alias_name = unique_workspace_name(alias, used_names)
            _link_or_copy(dest_nested, files_dir / alias_name)
            _link_or_copy(dest_nested, workspace / alias_name)
            listing.append(f"- ./files/{alias_name} (also ./{alias_name})")

    for entry in ordered:
        fid = str(entry.get("id") or "")
        if fid and fid in copied_ids:
            continue
        is_required = (
            fid in attach_ids
            or file_scope_of(entry) == "chat"
            or log_preanalysis.is_log_filename(str(entry.get("name") or ""))
        )
        name_aliases = _workspace_name_aliases(entry)
        primary = unique_workspace_name(name_aliases[0], used_names)
        source = UPLOAD_DIR / str(entry.get("stored_name") or "")
        if not source.exists() or not source.is_file():
            logger.warning(
                "workspace file missing on disk: name=%s stored=%s chat=%s",
                entry.get("name"),
                entry.get("stored_name"),
                chat_id,
            )
            notes.append(
                f"- ./files/{primary} (also ./{primary}) — MISSING on disk "
                f"(stored_name={entry.get('stored_name')}). Re-upload this file."
            )
            try:
                place_copy(None, primary, name_aliases)
            except OSError as error:
                logger.warning("workspace stub failed for %s: %s", primary, error)
                used_names.discard(primary.lower())
                continue
            listing.append(
                f"- ./files/{primary} (also ./{primary}) — MISSING on disk, stub only"
            )
            if fid:
                copied_ids.add(fid)
            continue
        try:
            size = source.stat().st_size
        except OSError as error:
            logger.warning("workspace stat failed for %s: %s", entry.get("name"), error)
            notes.append(
                f"- ./files/{primary} — could not read size ({error})"
            )
            continue
        if not is_required:
            if size > MAX_WORKSPACE_FILE_BYTES:
                logger.warning(
                    "skip workspace copy (too large): %s (%s bytes)",
                    entry.get("name"),
                    size,
                )
                notes.append(
                    f"- ./files/{primary} — SKIPPED, too large ({size} bytes)"
                )
                continue
            if total_bytes + size > MAX_WORKSPACE_TOTAL_BYTES:
                logger.warning(
                    "skip workspace copy (total cap): %s",
                    entry.get("name"),
                )
                notes.append(
                    f"- ./files/{primary} — SKIPPED, workspace total size cap"
                )
                continue
        try:
            place_copy(source, primary, name_aliases)
        except OSError as error:
            logger.warning("workspace copy failed for %s: %s", entry.get("name"), error)
            used_names.discard(primary.lower())
            notes.append(f"- ./files/{primary} — COPY FAILED ({error})")
            continue
        if fid:
            copied_ids.add(fid)
        total_bytes += size
        listing.append(f"- ./files/{primary} (also ./{primary})")
        logger.info(
            "workspace copy %s (%s bytes) required=%s chat=%s",
            primary,
            size,
            is_required,
            chat_id,
        )

    _write_workspace_hints(workspace, listing, notes)
    return workspace


def _write_workspace_hints(
    workspace: Path,
    listing: list[str],
    notes: list[str] | None = None,
) -> None:
    note_block = ""
    if notes:
        note_block = (
            "\n## Warnings\n\n"
            + "\n".join(notes)
            + "\n"
        )
    (workspace / "PROJECT_FILES.md").write_text(
        (
            "# Files in this workspace\n\n"
            "These are the only uploaded materials for this run. Read them from "
            "this folder only. Do not search parent directories, Helpomatica, "
            "Downloads, or invent client-PC paths. Names match the UI chips "
            "(for example `line_u_codes.log.1`), not hashed storage names.\n\n"
            f"{chr(10).join(listing) or '(no files copied)'}\n"
            f"{note_block}"
        ),
        encoding="utf-8",
    )
    (workspace / "README.md").write_text(
        (
            "# Helpomatica agent workspace\n\n"
            "This directory **is** your working directory (`cwd`). Files are "
            "already here under `./` and `./files/`.\n\n"
            "- FORBIDDEN: saying you left the workspace, that Shell is not in "
            "the workspace, or `cd` to Helpomatica / «папка проекта» / home / "
            "Downloads / parent folders.\n"
            "- Work only here. If a file is missing from `./` or `./files/`, "
            "say so — do not search elsewhere.\n"
            "- For `*.gz` logs: decompress with gzip/Python **only** on files "
            "inside this workspace (e.g. `./line_u.log.3.gz`).\n"
            "- If `./PREANALYSIS.md` exists, read it first. Do not re-scan whole logs "
            "unless those numbers look wrong. Cite log lines as `:15231:line_u_codes.log.1`.\n"
        ),
        encoding="utf-8",
    )
    (workspace / "WORKSPACE_ROOT.txt").write_text(
        f"{workspace}\n",
        encoding="utf-8",
    )
    (workspace / ".cursorignore").write_text(
        (
            "# Isolated agent workspace. Do not treat the Helpomatica git repo\n"
            "# or parent folders as part of this project.\n"
        ),
        encoding="utf-8",
    )
    cursor_dir = workspace / ".cursor"
    cursor_dir.mkdir(exist_ok=True)
    (cursor_dir / "workspace.md").write_text(
        (
            "# cwd constraint\n\n"
            "Working directory is this temp workspace. Never leave it. Never "
            "say you left it. All in-scope uploads are in ./ and ./files/.\n"
        ),
        encoding="utf-8",
    )
    (workspace / "AGENTS.md").write_text(
        (
            "# Agent instructions\n\n"
            "Your shell cwd is this workspace. FORBIDDEN to `cd` to Helpomatica, "
            "home, or «папка проекта». Use only ./ and ./files/. If a file is "
            "missing, report that — do not search parent dirs. "
            "If PREANALYSIS.md is present, use it first.\n"
        ),
        encoding="utf-8",
    )


READABLE_EXTENSIONS = {
    ".csv", ".json", ".log", ".md", ".py", ".sql", ".txt", ".xml", ".yaml", ".yml"
}
MAX_PROMPT_FILE_BYTES = 2 * 1024 * 1024
DEFAULT_QUERY_KEYWORDS = (
    "code", "codes", "insert", "create", "table", "barcode", "gtin", "баз", "код"
)
SQL_FOCUS_PATTERNS = (
    r"CREATE\s+FUNCTION[^\n]*codes_input_insert",
    r"CREATE\s+FUNCTION[^\n]*codes_input",
    r"CREATE\s+TABLE[^\n]*\bcodes\b",
    r"INSERT\s+INTO\s+codes\b",
    r"codes_input_meta",
    r"codes_output_insert",
)


def is_gzip_name(name: str) -> bool:
    return str(name or "").lower().endswith(".gz")


def is_prompt_readable_name(name: str) -> bool:
    """Rotated logs like ``.log.1`` are text; ``.gz`` is not inlined."""
    lower = str(name or "").lower()
    if is_gzip_name(lower):
        return False
    suffix = Path(lower).suffix
    if suffix in READABLE_EXTENSIONS:
        return True
    return bool(re.search(r"\.log(\.\d+)?$", lower))


def decode_text(raw: bytes) -> str:
    for encoding in ("utf-8-sig", "utf-16", "cp1251"):
        try:
            return raw.decode(encoding)
        except UnicodeDecodeError:
            continue
    return ""


def query_keywords(query: str) -> set[str]:
    words = {word.lower() for word in re.findall(r"[\w\u0400-\u04FF]+", query.lower()) if len(word) > 2}
    words.update(DEFAULT_QUERY_KEYWORDS)
    return words


def extract_relevant_excerpt(text: str, query: str, max_chars: int) -> str:
    if len(text) <= max_chars:
        return text

    lines = text.splitlines()
    keywords = query_keywords(query)
    ranges: list[tuple[int, int, int]] = []

    for pattern in SQL_FOCUS_PATTERNS:
        for match in re.finditer(pattern, text, flags=re.IGNORECASE):
            start_line = text[: match.start()].count("\n")
            ranges.append((10, max(0, start_line - 5), min(len(lines), start_line + 80)))

    for index, line in enumerate(lines):
        lower = line.lower()
        score = sum(1 for keyword in keywords if keyword in lower)
        if score:
            ranges.append((score, max(0, index - 10), min(len(lines), index + 25)))

    selected: list[str] = []
    used = 0
    header = "\n".join(lines[:30])
    if header:
        selected.append(header)
        used += len(header)

    for _, start, end in sorted(ranges, key=lambda item: item[0], reverse=True):
        chunk = "\n".join(lines[start:end])
        if not chunk or chunk in selected:
            continue
        if used + len(chunk) > max_chars:
            remaining = max_chars - used
            if remaining < 400:
                break
            chunk = chunk[:remaining]
        selected.append(chunk)
        used += len(chunk)
        if used >= max_chars:
            break

    if not selected:
        return text[:max_chars] + "\n[Файл сокращён]"

    excerpt = "\n\n".join(selected)
    if len(excerpt) < len(text):
        excerpt += "\n[Показаны только релевантные фрагменты файла]"
    return excerpt[:max_chars]


def select_project_files(
    data: dict,
    project_id: str,
    query: str,
    chat_id: str | None = None,
    attachment_ids: list[str] | None = None,
) -> list[dict]:
    files = iter_scoped_files(data, project_id, chat_id)
    lowered = query.lower()
    if any(token in lowered for token in ("базов", "base")):
        filtered = [entry for entry in files if "base" in entry["name"].lower()]
        if filtered:
            files = filtered
    elif "2.10" in lowered:
        filtered = [entry for entry in files if "2.10" in entry["name"]]
        if filtered:
            files = filtered
    ranked = rank_files_for_workspace(files, query, attachment_ids)
    return dedupe_workspace_files(ranked)


def build_sql_summary(text: str, query: str, max_chars: int) -> str:
    lines = text.splitlines()
    keywords = query_keywords(query)
    tables = [
        line.strip()
        for line in lines
        if "CREATE TABLE" in line.upper() and any(keyword in line.lower() for keyword in keywords)
    ][:8]
    if not tables:
        tables = [
            line.strip()
            for line in lines
            if "CREATE TABLE" in line.upper() and "codes" in line.lower()
        ][:8]
    functions = [
        line.strip()
        for line in lines
        if "CREATE FUNCTION" in line.upper() and any(keyword in line.lower() for keyword in keywords)
    ][:6]
    triggers = [
        line.strip()
        for line in lines
        if "TRIGGER" in line.upper() and any(keyword in line.lower() for keyword in keywords)
    ][:6]
    snippets: list[str] = []
    for pattern in SQL_FOCUS_PATTERNS:
        for match in re.finditer(pattern, text, flags=re.IGNORECASE):
            start_line = text[: match.start()].count("\n")
            snippet = "\n".join(lines[start_line : start_line + 35]).strip()
            if snippet and snippet not in snippets:
                snippets.append(snippet[:700])
            if len(snippets) >= 2:
                break
        if len(snippets) >= 2:
            break
    summary_parts = []
    if tables:
        summary_parts.append("Таблицы:\n" + "\n".join(tables))
    if functions:
        summary_parts.append("Функции:\n" + "\n".join(functions))
    if triggers:
        summary_parts.append("Триггеры:\n" + "\n".join(triggers))
    if snippets:
        summary_parts.append("Фрагменты SQL:\n" + "\n\n---\n\n".join(snippets))
    summary = "\n\n".join(summary_parts) or text[:max_chars]
    return summary[:max_chars]


def build_file_context(
    data: dict,
    project_id: str,
    query: str = "",
    chat_id: str | None = None,
    attachment_ids: list[str] | None = None,
) -> tuple[str, list[str]]:
    parts: list[str] = []
    selected = select_project_files(
        data, project_id, query, chat_id=chat_id, attachment_ids=attachment_ids
    )
    # Unique names for UI context chips (no eight copies of the same gz).
    used_names = [entry["name"] for entry in selected]
    remaining = 2_500
    per_file = 1_200
    for entry in selected:
        source = UPLOAD_DIR / entry["stored_name"]
        safe = sanitize_workspace_filename(entry["name"])
        workspace_hint = f"Рабочая копия: ./files/{safe} и ./{safe}"
        exists = source.exists() and source.is_file()
        size = 0
        if exists:
            try:
                size = source.stat().st_size
            except OSError:
                exists = False
        readable = is_prompt_readable_name(entry["name"])
        if not exists or not readable:
            gz_hint = (
                " Это .gz — распакуйте gzip/Python gzip только внутри workspace."
                if is_gzip_name(entry["name"])
                else ""
            )
            missing = "" if exists else " Файл не найден на диске сервера."
            parts.append(
                f"--- {entry['name']} ---\n"
                f"[Бинарный/нетекстовый файл: текст не встроен. {workspace_hint} — "
                f"откройте этот путь в workspace, не ищите файл на ПК пользователя."
                f"{gz_hint}{missing}]"
            )
            continue
        if size > MAX_PROMPT_FILE_BYTES:
            parts.append(
                f"--- {entry['name']} ---\n"
                f"[Файл большой ({size} байт), текст не встроен в промпт. "
                f"{workspace_hint} — читайте его из workspace.]"
            )
            continue
        if remaining <= 0:
            parts.append(
                f"--- {entry['name']} ---\n"
                f"[Файл есть в проекте, текст не включён из‑за лимита контекста. "
                f"{workspace_hint}]"
            )
            continue
        text = decode_text(source.read_bytes())
        if not text:
            parts.append(
                f"--- {entry['name']} ---\n"
                f"[Не удалось определить кодировку. {workspace_hint}]"
            )
            continue
        budget = min(per_file, remaining)
        if str(entry["name"]).lower().endswith(".sql"):
            excerpt = build_sql_summary(text, query, budget)
        else:
            excerpt = extract_relevant_excerpt(text, query, budget)
        remaining -= len(excerpt)
        parts.append(f"--- {entry['name']} ---\n{workspace_hint}\n{excerpt}")
    return ("\n\n".join(parts) or "[Файлы не добавлены]", used_names)


def _file_chip(entry: dict) -> dict:
    return {"id": entry.get("id") or "", "name": entry.get("name") or "файл"}


def dedupe_file_chips(items: list[dict]) -> list[dict]:
    seen_ids: set[str] = set()
    seen_names: set[str] = set()
    unique: list[dict] = []
    for item in items:
        fid = str((item or {}).get("id") or "")
        name = str((item or {}).get("name") or "").strip()
        key = name.lower()
        if fid and fid in seen_ids:
            continue
        if key and key in seen_names:
            continue
        if fid:
            seen_ids.add(fid)
        if key:
            seen_names.add(key)
        unique.append({"id": fid, "name": name or "файл"})
    return unique


def build_context_chip_groups(
    data: dict,
    project_id: str,
    chat_id: str | None,
    messages: list[dict],
) -> dict:
    last_user = next(
        (message for message in reversed(messages) if message.get("role") == "user"),
        {},
    )
    attachments = dedupe_file_chips(
        [
            {
                "id": str((ref or {}).get("id") or ""),
                "name": str((ref or {}).get("name") or "файл"),
            }
            for ref in last_user.get("attachments") or []
        ]
    )
    attach_ids = {item["id"] for item in attachments if item["id"]}
    attach_names = {item["name"].lower() for item in attachments if item["name"]}
    chat_files: list[dict] = []
    project_files: list[dict] = []
    for entry in iter_scoped_files(data, project_id, chat_id):
        chip = _file_chip(entry)
        if chip["id"] in attach_ids or chip["name"].lower() in attach_names:
            continue
        if file_scope_of(entry) == "chat":
            chat_files.append(chip)
        else:
            project_files.append(chip)
    return {
        "attachments": attachments,
        "chat_files": dedupe_file_chips(chat_files),
        "project_files": dedupe_file_chips(project_files),
    }


def _sdk_attr(obj: Any, *names: str, default: Any = "") -> Any:
    if obj is None:
        return default
    if isinstance(obj, Mapping):
        for name in names:
            if name in obj and obj[name] is not None:
                return obj[name]
        return default
    for name in names:
        if hasattr(obj, name):
            value = getattr(obj, name)
            if value is not None:
                return value
    return default


def _assistant_text_from_sdk(message: Any) -> str:
    payload = _sdk_attr(message, "message", default=None)
    content = _sdk_attr(payload, "content", default=()) or ()
    parts: list[str] = []
    for block in content:
        text = _sdk_attr(block, "text", default="")
        if text:
            parts.append(str(text))
    return "".join(parts)


def _emit_text_chunk(
    parts: list[str],
    text: str,
    *,
    snapshot: bool = False,
) -> tuple[str, bool]:
    incoming = str(text or "")
    if not incoming:
        return "", False
    current = "".join(parts)
    if snapshot:
        if incoming == current:
            return "", False
        if incoming.startswith(current):
            chunk = incoming[len(current) :]
            if chunk:
                parts.append(chunk)
            return chunk, False
        parts.clear()
        parts.append(incoming)
        return incoming, True
    parts.append(incoming)
    return incoming, False


_JUNK_STATUS_TOKENS = {
    "finished",
    "running",
    "done",
    "completed",
    "complete",
    "success",
    "ok",
    "ready",
    "idle",
    "завершено",
    "готово",
}

_PROMPT_LEFTOVER_RE = re.compile(
    r"^\s*(на русском языке\.?\s*)+",
    re.IGNORECASE,
)
_FINISHED_TOKEN_RE = re.compile(r"(?i)\b(FINISHED|RUNNING)\b")

_TOOL_TITLES = {
    "read": "Читаю файл",
    "readfile": "Читаю файл",
    "shell": "Команда",
    "bash": "Команда",
    "command": "Команда",
    "grep": "Поиск",
    "rg": "Поиск",
    "glob": "Поиск файлов",
    "write": "Запись файла",
    "edit": "Правка",
    "delete": "Удаление",
    "ls": "Список файлов",
    "readlints": "Проверка",
    "mcp": "Инструмент",
    "semsearch": "Семантический поиск",
    "createplan": "План",
    "updatetodos": "Задачи",
    "task": "Задача",
    "generateimage": "Изображение",
    "recordscreen": "Запись экрана",
}


def _is_junk_status(text: str) -> bool:
    normalized = re.sub(r"[^a-zа-яё]+", "", (text or "").strip().lower())
    return normalized in _JUNK_STATUS_TOKENS


def _clean_thinking_chunk(text: str) -> str:
    value = str(text or "")
    kept: list[str] = []
    for line in value.splitlines(keepends=True):
        stripped = line.strip()
        if _is_junk_status(stripped):
            continue
        kept.append(_FINISHED_TOKEN_RE.sub("", line))
    value = "".join(kept)
    value = _PROMPT_LEFTOVER_RE.sub("", value)
    if _is_junk_status(value):
        return ""
    return value


def _suffix_prefix_overlap(current: str, incoming: str) -> int:
    max_n = min(len(current), len(incoming))
    for length in range(max_n, 0, -1):
        if current.endswith(incoming[:length]):
            return length
    return 0


def _append_thinking_chunk(parts: list[str], text: str, *, snapshot: bool = False) -> str:
    """Append thinking text. Never replace previously accumulated history."""
    incoming = _clean_thinking_chunk(text)
    if not incoming:
        return ""
    current = "".join(parts)
    if snapshot:
        if not current:
            chunk = incoming
        elif incoming == current or current.endswith(incoming):
            return ""
        elif incoming.startswith(current):
            chunk = incoming[len(current) :]
        elif incoming in current:
            return ""
        else:
            overlap = _suffix_prefix_overlap(current, incoming)
            if overlap == len(incoming):
                return ""
            if overlap > 0:
                chunk = incoming[overlap:]
            else:
                sep = "" if current.endswith("\n") else "\n"
                chunk = f"{sep}{incoming}"
    else:
        chunk = incoming
    if not chunk:
        return ""
    parts.append(chunk)
    return chunk


def _as_dict(value: Any) -> dict[str, Any]:
    if isinstance(value, Mapping):
        return dict(value)
    return {}


def _short_path(value: str) -> str:
    text = str(value or "").strip().replace("\\", "/")
    if not text:
        return ""
    return text.rstrip("/").rsplit("/", 1)[-1] or text


def _normalize_tool_type(value: str) -> str:
    key = re.sub(r"[^a-zA-Z]", "", str(value or "")).lower()
    return key or "tool"


def _tool_title(tool_type: str) -> str:
    return _TOOL_TITLES.get(_normalize_tool_type(tool_type), "Инструмент")


def _truncate_detail(text: str, limit: int = 4000) -> str:
    value = str(text or "").strip()
    if len(value) <= limit:
        return value
    return value[:limit].rstrip() + "\n…"


def _tool_detail(tool_type: str, args: Any) -> str:
    payload = _as_dict(args)
    kind = _normalize_tool_type(tool_type)
    if kind in {"read", "readfile", "write", "edit", "delete"}:
        return _short_path(
            str(
                payload.get("path")
                or payload.get("file")
                or payload.get("target_file")
                or ""
            )
        )
    if kind in {"shell", "bash", "command"}:
        return str(payload.get("command") or payload.get("cmd") or "").strip()
    if kind in {"grep", "rg"}:
        pattern = str(payload.get("pattern") or payload.get("query") or "").strip()
        path = _short_path(str(payload.get("path") or payload.get("glob") or ""))
        return f"{pattern}  {path}".strip() if path else pattern
    if kind == "glob":
        return str(
            payload.get("globPattern")
            or payload.get("glob_pattern")
            or payload.get("pattern")
            or ""
        ).strip()
    if kind == "ls":
        return str(payload.get("path") or payload.get("targetDirectory") or "").strip()
    if kind == "semsearch":
        return str(payload.get("query") or payload.get("pattern") or "").strip()
    if kind == "mcp":
        name = str(payload.get("toolName") or payload.get("name") or "").strip()
        server = str(payload.get("server") or payload.get("provider") or "").strip()
        return f"{server}/{name}".strip("/") if server or name else ""
    if kind == "task":
        return str(payload.get("description") or payload.get("prompt") or "").strip()
    for key in ("path", "command", "pattern", "query", "name", "message"):
        item = payload.get(key)
        if item:
            return str(item).strip()
    return ""


def _describe_tool(tool_call: Any, name_fallback: str = "") -> tuple[str, str, str]:
    payload = _as_dict(tool_call)
    tool_type = str(
        payload.get("type")
        or payload.get("name")
        or name_fallback
        or "tool"
    )
    args = payload.get("args")
    if args is None:
        args = payload
    title = _tool_title(tool_type)
    if title == "Инструмент" and name_fallback:
        title = _tool_title(name_fallback)
        if title == "Инструмент":
            title = str(name_fallback).strip() or "Инструмент"
    detail = _truncate_detail(_tool_detail(tool_type, args), 1200)
    return _normalize_tool_type(tool_type) or "tool", title, detail


def _activity_transcript(activity: list[dict[str, Any]]) -> str:
    lines: list[str] = []
    for step in activity:
        kind = str(step.get("type") or "")
        title = str(step.get("title") or "").strip()
        detail = str(step.get("detail") or "").strip()
        if kind == "thinking":
            if detail:
                lines.append(detail)
            continue
        if title and detail:
            lines.append(f"{title}: {detail}")
        elif title:
            lines.append(title)
        elif detail:
            lines.append(detail)
    return "\n".join(lines).strip()


def _coalesce_thinking_steps(activity: list[dict[str, Any]]) -> list[dict[str, Any]]:
    merged: list[dict[str, Any]] = []
    for step in activity:
        kind = str(step.get("type") or "")
        detail = str(step.get("detail") or "")
        if kind in {"thinking", "status"} and _is_junk_status(detail):
            continue
        last = merged[-1] if merged else None
        if kind == "thinking" and last is not None and str(last.get("type") or "") == "thinking":
            prev = str(last.get("detail") or "")
            if detail:
                if detail == prev or prev.endswith(detail) or detail in prev:
                    pass
                elif detail.startswith(prev):
                    last["detail"] = detail
                else:
                    last["detail"] = prev + detail
            last["status"] = step.get("status") or last.get("status")
            if step.get("title"):
                last["title"] = step.get("title")
            continue
        merged.append(dict(step))
    return merged


def _trim_activity(activity: list[dict[str, Any]]) -> list[dict[str, Any]]:
    coalesced = _coalesce_thinking_steps(activity)
    trimmed: list[dict[str, Any]] = []
    for step in coalesced[-240:]:
        entry = {
            "id": step.get("id"),
            "type": step.get("type"),
            "title": step.get("title"),
            "detail": _truncate_detail(str(step.get("detail") or ""), 8000),
            "status": step.get("status"),
        }
        trimmed.append(entry)
    return trimmed


def build_chat_prompt(
    project: dict,
    file_context: str,
    history: str,
    extra: str = "",
) -> str:
    extra_block = f"\n{extra.strip()}\n\n" if (extra or "").strip() else ""
    return (
        f"Проект: {project['name']}\n"
        f"Описание: {project['description']}\n"
        f"Инструкции: {project['instructions'] or 'Нет'}\n\n"
        f"Материалы:\n{file_context}\n\n"
        f"История:\n{history}\n\n"
        "Правила платформы Helpomatica:\n"
        "- Текущая рабочая директория (cwd) УЖЕ является изолированным "
        "workspace агента. Файлы УЖЕ лежат в cwd: ./имя_файла и ./files/имя_файла "
        "(см. PROJECT_FILES.md). PREANALYSIS.md и логи тоже в `./`. "
        "Работай только там.\n"
        "- ЗАПРЕЩЕНО: писать, что Shell/cwd «не в workspace», что ты «уходишь "
        "из workspace», «переходишь к рабочей папке проекта», делаешь `cd` в "
        "Helpomatica, домашнюю папку, Downloads или родительские каталоги. "
        "Не выполняй `cd` вообще. cwd уже правильный. Никогда не пиши, что "
        "shell покинул workspace.\n"
        "- Если файла нет в ./ или ./files/ — скажи, что его нет среди "
        "загруженных материалов. НЕ ищи в родительских папках, в git-репозитории "
        "Helpomatica, на диске сервера и на ПК пользователя "
        "(Downloads, C:\\Users\\..., /home/...). Не выдумывай абсолютные пути.\n"
        "- Имена файлов совпадают с чипами в UI (например line_u.log.3.gz), "
        "а не с hashed stored_name. Пользователь мог открыть Helpomatica с "
        "другого ПК по LAN — путей с его компьютера не существует.\n"
        "- Для логов *.gz / *.log.*.gz: распаковывай и читай только файлы "
        "внутри workspace (gzip, Python gzip на ./файл.gz).\n"
        "- Если есть ./PREANALYSIS.md — прочитай его ПЕРВЫМ. Не сканируй "
        "логи целиком, если цифры выглядят правдоподобно. Цитируй строки как "
        "`:15231:line_u_codes.log.1` или `::log:line_u_codes.log.1:15231::`.\n"
        "- Генерация изображений недоступна: в Helpomatica нет image API и нет "
        "инструмента создания картинок. Не утверждай, что сгенерировал, нарисовал "
        "или сохранил изображение. Не вставляй markdown-изображения без реального "
        "доступного URL. Если пользователь просит картинку — честно скажи, что "
        "генерация изображений недоступна, и предложи текстовое описание или "
        "mermaid-диаграмму.\n"
        "- Отвечай только полезным текстом/markdown/mermaid по существу вопроса.\n\n"
        f"{extra_block}"
        "Ответь кратко и по делу на последнее сообщение пользователя."
    )


def normalize_analysis_question(text: str) -> str:
    value = _ATTACHED_NAMES_RE.sub("", str(text or ""))
    value = re.sub(r"\s+", " ", value).strip().lower()
    return value


def analysis_file_signature(files: list[dict]) -> str:
    parts = [
        f"{entry.get('id')}:{entry.get('size', 0)}"
        for entry in sorted(files, key=lambda item: str(item.get("id") or ""))
        if entry.get("id")
    ]
    return hashlib.sha256("|".join(parts).encode("utf-8")).hexdigest()


def analysis_cache_key(files: list[dict], question: str) -> str:
    raw = f"{analysis_file_signature(files)}|{normalize_analysis_question(question)}"
    return hashlib.sha256(raw.encode("utf-8")).hexdigest()


def lookup_analysis_cache(
    data: dict,
    project_id: str,
    files: list[dict],
    question: str,
) -> dict | None:
    cache = data.get("analysis_cache") or []
    key = analysis_cache_key(files, question)
    for entry in reversed(cache):
        if entry.get("project_id") == project_id and entry.get("key") == key:
            return entry
    job_id = log_preanalysis.detect_job_id(question)
    file_sig = analysis_file_signature(files)
    if not job_id or not file_sig:
        return None
    for entry in reversed(cache):
        if (
            entry.get("project_id") == project_id
            and entry.get("file_sig") == file_sig
            and entry.get("job_id") == job_id
        ):
            near = dict(entry)
            near["near_match"] = True
            return near
    return None


def store_analysis_cache(
    project_id: str,
    files: list[dict],
    question: str,
    answer: str,
    preanalysis: str = "",
    summary: str = "",
) -> None:
    answer = (answer or "").strip()
    if not answer:
        return
    data = load_db()
    entry = {
        "key": analysis_cache_key(files, question),
        "file_sig": analysis_file_signature(files),
        "project_id": project_id,
        "job_id": log_preanalysis.detect_job_id(question) or "",
        "question": normalize_analysis_question(question)[:500],
        "answer": answer[:8000],
        "preanalysis": (preanalysis or "")[:80_000],
        "summary": (summary or "")[:2000],
        "created_at": now(),
    }
    cache = [
        item
        for item in (data.get("analysis_cache") or [])
        if not (
            item.get("project_id") == project_id and item.get("key") == entry["key"]
        )
    ]
    cache.append(entry)
    data["analysis_cache"] = cache[-80:]
    save_db(data)


def _prompt_extra_from_cache_and_scan(
    cache_hit: dict | None,
    preanalysis_md: str,
) -> str:
    parts: list[str] = []
    if preanalysis_md:
        parts.append(
            "В cwd уже лежит ./PREANALYSIS.md — используй его первым, "
            "не перечитывай логи целиком."
        )
    if cache_hit and (cache_hit.get("answer") or cache_hit.get("summary")):
        if cache_hit.get("near_match"):
            parts.append(
                "Похожий предыдущий разбор по тем же файлам (не пересчитывай "
                "с нуля, уточни если вопрос уже):\n"
                f"{(cache_hit.get('summary') or '')}\n\n"
                f"{(cache_hit.get('answer') or '')[:6000]}"
            )
        else:
            parts.append(
                "Предыдущий разбор (не пересчитывай с нуля, уточни если вопрос уже):\n"
                f"{(cache_hit.get('summary') or '')}\n\n"
                f"{(cache_hit.get('answer') or '')[:6000]}\n\n"
                "Вопрос совпадает — ответь короче, без полного пересчёта."
            )
    return "\n\n".join(parts)


def resolve_upload_path(entry: dict) -> Path:
    return UPLOAD_DIR / str(entry.get("stored_name") or "")


def log_display_name(entry: dict) -> str:
    return sanitize_workspace_filename(
        _strip_upload_uuid_prefixes(str(entry.get("name") or "log"))
    )


def file_in_user_scope(data: dict, stored_file: dict) -> bool:
    """Any authenticated user can see project files; chat-scoped files stay in-project."""
    if not stored_file:
        return False
    project_id = stored_file.get("project_id")
    if not project_id:
        return False
    return any(item.get("id") == project_id for item in data.get("projects") or [])


def snippet_around(text: str, needle: str, radius: int = 70) -> str:
    raw = str(text or "").replace("\n", " ")
    lowered = raw.lower()
    index = lowered.find(needle.lower())
    if index < 0:
        return raw[: radius * 2]
    start = max(0, index - radius)
    end = min(len(raw), index + len(needle) + radius)
    snippet = raw[start:end].strip()
    if start > 0:
        snippet = "…" + snippet
    if end < len(raw):
        snippet = snippet + "…"
    return snippet


def attachment_filename(filename: str, fallback: str = "download") -> str:
    name = (filename or fallback).replace("\r", " ").replace("\n", " ").strip() or fallback
    ascii_name = re.sub(r"[^A-Za-z0-9._-]+", "_", name).strip("._") or fallback
    return f"attachment; filename=\"{ascii_name}\"; filename*=UTF-8''{quote(name)}"


def export_chat_markdown(chat: dict, project: dict, messages: list[dict]) -> str:
    title = chat.get("title") or "Чат"
    lines = [
        f"# {title}",
        "",
        f"- Проект: {project.get('name') or ''}",
        f"- Обновлён: {chat.get('updated_at') or ''}",
        "",
    ]
    for message in messages:
        role = "Помощник" if message.get("role") == "assistant" else (
            message.get("author_name") or "Пользователь"
        )
        created = message.get("created_at") or ""
        lines.append(f"## {role}")
        if created:
            lines.append(f"*{created}*")
        lines.append("")
        attachments = message.get("attachments") or []
        if attachments:
            names = ", ".join(
                str(item.get("name") or item.get("id") or "файл") for item in attachments
            )
            lines.append(f"Вложения: {names}")
            lines.append("")
        lines.append(str(message.get("content") or "").strip() or "_(пусто)_")
        lines.append("")
    return "\n".join(lines).rstrip() + "\n"


def sse_format(event: str, data: dict) -> str:
    return f"event: {event}\ndata: {json.dumps(data, ensure_ascii=False)}\n\n"


def _put_event(out: queue.Queue, event_type: str, **payload: Any) -> None:
    out.put({"type": event_type, **payload})


def _stream_cursor_agent_threaded(
    prompt: str,
    workspace: Path,
    model: str,
    chat_id: str,
    out: queue.Queue,
    cancel_event: threading.Event,
) -> None:
    if sys.platform == "win32":
        asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())

    async def _run() -> None:
        from cursor_sdk import (
            AgentOptions,
            AsyncAgent,
            AsyncClient,
            CursorAgentError,
            LocalAgentOptions,
        )

        api_key = os.getenv("CURSOR_API_KEY", "").strip()
        if not api_key:
            raise RuntimeError(
                "CURSOR_API_KEY не настроен. Добавьте ключ в файл .env и перезапустите сервер."
            )

        loop = asyncio.get_running_loop()
        with agent_status_lock:
            entry = active_runs.get(chat_id)
            if entry is not None:
                entry["loop"] = loop

        answer_parts: list[str] = []
        thinking_parts: list[str] = []
        activity_log: list[dict[str, Any]] = []
        thinking_ms: int | None = None
        cancelled = False
        activity_seq = 0
        current_thinking_id: str | None = None
        tool_activity_ids: dict[str, str] = {}
        seen_tool_keys: set[tuple[str, str]] = set()

        def emit_thinking(text: str) -> None:
            if not text:
                return
            _put_event(out, "thinking", text=text, replace=False)

        def append_thinking_transcript(text: str) -> None:
            chunk = _append_thinking_chunk(thinking_parts, text, snapshot=False)
            if chunk:
                emit_thinking(chunk)

        def emit_answer(text: str, *, replace: bool = False) -> None:
            if not text and not replace:
                return
            _put_event(out, "delta", text=text, replace=replace)

        def emit_activity(step: dict[str, Any]) -> dict[str, Any]:
            nonlocal activity_seq
            payload = dict(step)
            if not payload.get("id"):
                activity_seq += 1
                payload["id"] = f"a{activity_seq}"
            existing = next(
                (item for item in activity_log if item.get("id") == payload["id"]),
                None,
            )
            if existing is not None:
                if payload.get("append") and payload.get("detail"):
                    existing["detail"] = str(existing.get("detail") or "") + str(
                        payload.get("detail") or ""
                    )
                    payload["detail"] = existing["detail"]
                    payload.pop("append", None)
                else:
                    for key, value in payload.items():
                        if value is not None:
                            existing[key] = value
                payload = dict(existing)
            else:
                payload.pop("append", None)
                activity_log.append(payload)
            _put_event(out, "activity", step=payload)
            return payload

        def handle_thinking_text(text: str, *, snapshot: bool = False) -> None:
            nonlocal current_thinking_id
            chunk = _append_thinking_chunk(
                thinking_parts, text, snapshot=snapshot
            )
            if not chunk:
                return
            emit_thinking(chunk)
            if not current_thinking_id:
                last = activity_log[-1] if activity_log else None
                if last is not None and str(last.get("type") or "") == "thinking":
                    current_thinking_id = str(last.get("id") or "") or None
            if current_thinking_id:
                emit_activity(
                    {
                        "id": current_thinking_id,
                        "type": "thinking",
                        "title": "Размышления",
                        "detail": chunk,
                        "status": "running",
                        "append": True,
                    }
                )
            else:
                step = emit_activity(
                    {
                        "type": "thinking",
                        "title": "Размышления",
                        "detail": chunk,
                        "status": "running",
                    }
                )
                current_thinking_id = str(step["id"])

        def close_thinking_step(*, end_phase: bool = True) -> None:
            nonlocal current_thinking_id
            if not current_thinking_id:
                return
            emit_activity(
                {
                    "id": current_thinking_id,
                    "type": "thinking",
                    "title": "Размышления",
                    "status": "completed",
                }
            )
            if end_phase:
                current_thinking_id = None

        def handle_answer_text(text: str, *, snapshot: bool | None = False) -> None:
            incoming = str(text or "")
            if not incoming:
                return
            current = "".join(answer_parts)
            use_snapshot = snapshot
            if snapshot is None:
                if not current:
                    use_snapshot = False
                elif incoming == current:
                    return
                elif incoming.startswith(current):
                    use_snapshot = True
                elif current.startswith(incoming):
                    return
                else:
                    use_snapshot = False
            chunk, replace = _emit_text_chunk(
                answer_parts, incoming, snapshot=bool(use_snapshot)
            )
            if chunk or replace:
                emit_answer(chunk, replace=replace)

        def flush_answer_to_thinking() -> None:
            text = "".join(answer_parts).strip()
            if not text:
                return
            close_thinking_step()
            emit_activity(
                {
                    "type": "narration",
                    "title": "Заметка",
                    "detail": _truncate_detail(text, 4000),
                    "status": "completed",
                }
            )
            append_thinking_transcript(f"{text}\n")
            answer_parts.clear()
            emit_answer("", replace=True)

        def handle_tool_event(
            tool_call: Any,
            *,
            name: str = "",
            status: str = "",
            call_id: str = "",
        ) -> None:
            state = (status or "running").strip().lower()
            if state in ("complete", "success"):
                state = "completed"
            ident = str(call_id or _sdk_attr(tool_call, "call_id", "callId", default="") or "")
            already = bool(ident) and (ident, state) in seen_tool_keys
            if ident:
                seen_tool_keys.add((ident, state))
            kind, title, detail = _describe_tool(tool_call, name)
            if not ident:
                for item in reversed(activity_log[-12:]):
                    if (
                        item.get("title") == title
                        and (item.get("detail") or "") == (detail or "")
                        and (item.get("status") or "") == (state or "running")
                    ):
                        return
            step_id = tool_activity_ids.get(ident) if ident else None
            if already and state == "running":
                if step_id and detail:
                    emit_activity(
                        {
                            "id": step_id,
                            "type": kind,
                            "title": title,
                            "detail": detail,
                            "status": "running",
                        }
                    )
                return

            flush_answer_to_thinking()
            close_thinking_step()
            if state == "running" or not step_id:
                step = emit_activity(
                    {
                        "id": step_id,
                        "type": kind,
                        "title": title,
                        "detail": detail,
                        "status": state or "running",
                    }
                )
                if ident:
                    tool_activity_ids[ident] = str(step["id"])
                if not already:
                    line = f"{title}" + (f": {detail}" if detail else "")
                    append_thinking_transcript(f"{line}\n")
                return
            emit_activity(
                {
                    "id": step_id,
                    "type": kind,
                    "title": title,
                    "detail": detail or None,
                    "status": state,
                }
            )

        def handle_status_event(status: str, message: str = "") -> None:
            label = str(message or status or "").strip()
            if not label or _is_junk_status(label) or _is_junk_status(status):
                return
            close_thinking_step()
            emit_activity(
                {
                    "type": "status",
                    "title": "Статус",
                    "detail": label,
                    "status": "completed",
                }
            )
            append_thinking_transcript(f"{label}\n")

        def handle_shell_output(payload: Any) -> None:
            data = _as_dict(payload)
            chunk = str(
                data.get("stdout")
                or data.get("text")
                or data.get("data")
                or data.get("output")
                or ""
            )
            if not chunk:
                return
            last_shell = next(
                (
                    item
                    for item in reversed(activity_log)
                    if item.get("type") in {"shell", "bash", "command"}
                ),
                None,
            )
            if last_shell is None:
                return
            emit_activity(
                {
                    "id": last_shell.get("id"),
                    "type": last_shell.get("type"),
                    "title": last_shell.get("title") or "Команда",
                    "detail": chunk,
                    "status": last_shell.get("status") or "running",
                    "append": True,
                }
            )

        # Same resolved absolute long path for bridge --workspace AND
        # LocalAgentOptions.cwd (and Agent.create local=). Short 8.3 paths
        # make the agent think the shell left the workspace.
        # The SDK bridge subprocess inherits the server cwd (Helpomatica repo)
        # unless we set it explicitly — patch create_subprocess_exec for launch.
        workspace_cwd = agent_workspace_cwd(workspace)
        local_opts = LocalAgentOptions(cwd=workspace_cwd)
        logger.info("agent launch workspace=%s", workspace_cwd)
        import cursor_sdk._async_bridge as _async_bridge

        orig_exec = _async_bridge.asyncio.create_subprocess_exec

        async def _exec_in_workspace(*args: Any, **kwargs: Any):
            kwargs.setdefault("cwd", workspace_cwd)
            return await orig_exec(*args, **kwargs)

        _async_bridge.asyncio.create_subprocess_exec = _exec_in_workspace
        try:
            bridge_client = await AsyncClient.launch_bridge(
                workspace=workspace_cwd,
                local=local_opts,
            )
        finally:
            _async_bridge.asyncio.create_subprocess_exec = orig_exec
        try:
            async with bridge_client as client:
                await asyncio.sleep(0.75)
                agent = await AsyncAgent.create(
                    AgentOptions(
                        api_key=api_key,
                        model=model or default_model(),
                        local=local_opts,
                    ),
                    client=client,
                )
                try:
                    run = await agent.send(prompt)
                    with agent_status_lock:
                        entry = active_runs.get(chat_id)
                        if entry is not None:
                            entry["run"] = run

                    async for event in run.events():
                        if cancel_event.is_set():
                            cancelled = True
                            try:
                                if run.supports("cancel"):
                                    await run.cancel()
                            except Exception as cancel_error:  # noqa: BLE001
                                logger.warning("cancel failed: %s", cancel_error)
                            break

                        update = getattr(event, "interaction_update", None)
                        if update is not None:
                            utype = str(_sdk_attr(update, "type", default=""))
                            nested = _sdk_attr(update, "update", default=None)
                            if utype == "thinking-delta":
                                handle_thinking_text(
                                    str(_sdk_attr(update, "text", default="") or ""),
                                    snapshot=False,
                                )
                            elif utype == "thinking-completed":
                                close_thinking_step(end_phase=False)
                                duration = _sdk_attr(
                                    update,
                                    "thinking_duration_ms",
                                    "thinkingDurationMs",
                                    default=None,
                                )
                                if duration is not None:
                                    try:
                                        thinking_ms = int(duration)
                                    except (TypeError, ValueError):
                                        pass
                            elif utype == "text-delta":
                                handle_answer_text(
                                    str(_sdk_attr(update, "text", default="") or ""),
                                    snapshot=False,
                                )
                            elif utype in (
                                "tool-call-started",
                                "tool-call-completed",
                                "partial-tool-call",
                            ):
                                tool_call = _sdk_attr(update, "tool_call", default={})
                                name = str(
                                    _sdk_attr(tool_call, "type", "name", default="")
                                    or _sdk_attr(update, "name", default="")
                                )
                                status = (
                                    "running"
                                    if utype in ("tool-call-started", "partial-tool-call")
                                    else "completed"
                                )
                                handle_tool_event(
                                    tool_call,
                                    name=name,
                                    status=status,
                                    call_id=str(
                                        _sdk_attr(
                                            update, "call_id", "callId", default=""
                                        )
                                        or ""
                                    ),
                                )
                            elif utype == "shell-output-delta":
                                handle_shell_output(
                                    _sdk_attr(update, "event", default={})
                                )
                            elif utype == "summary":
                                summary = str(
                                    _sdk_attr(update, "summary", default="") or ""
                                ).strip()
                                if summary:
                                    close_thinking_step()
                                    emit_activity(
                                        {
                                            "type": "status",
                                            "title": "Сводка",
                                            "detail": _truncate_detail(summary, 2000),
                                            "status": "completed",
                                        }
                                    )
                                    append_thinking_transcript(f"{summary}\n")
                            elif utype in (
                                "token-delta",
                                "step-started",
                                "step-completed",
                                "turn-ended",
                                "user-message-appended",
                                "summary-started",
                                "summary-completed",
                            ):
                                pass
                            elif isinstance(nested, Mapping):
                                nested_type = str(nested.get("type") or utype)
                                nested_text = str(nested.get("text") or "")
                                if nested_type == "thinking-delta" and nested_text:
                                    handle_thinking_text(nested_text, snapshot=False)
                                elif nested_type == "text-delta" and nested_text:
                                    handle_answer_text(nested_text, snapshot=False)
                                elif nested_type in (
                                    "tool-call-started",
                                    "tool-call-completed",
                                    "partial-tool-call",
                                ):
                                    handle_tool_event(
                                        nested.get("toolCall")
                                        or nested.get("tool_call")
                                        or nested,
                                        name=str(nested.get("name") or ""),
                                        status=(
                                            "completed"
                                            if nested_type == "tool-call-completed"
                                            else "running"
                                        ),
                                        call_id=str(
                                            nested.get("callId")
                                            or nested.get("call_id")
                                            or ""
                                        ),
                                    )
                            elif utype:
                                detail = str(
                                    _sdk_attr(update, "text", "message", default="")
                                    or ""
                                ).strip()
                                if detail and not _is_junk_status(detail):
                                    close_thinking_step()
                                    emit_activity(
                                        {
                                            "type": "status",
                                            "title": utype,
                                            "detail": _truncate_detail(detail, 800),
                                            "status": "running",
                                        }
                                    )

                        message = getattr(event, "sdk_message", None)
                        if message is not None:
                            mtype = str(_sdk_attr(message, "type", default=""))
                            if mtype == "thinking":
                                handle_thinking_text(
                                    str(_sdk_attr(message, "text", default="") or ""),
                                    snapshot=True,
                                )
                                duration = _sdk_attr(
                                    message,
                                    "thinking_duration_ms",
                                    "thinkingDurationMs",
                                    default=None,
                                )
                                if duration is not None:
                                    try:
                                        thinking_ms = int(duration)
                                    except (TypeError, ValueError):
                                        pass
                                close_thinking_step(end_phase=False)
                            elif mtype == "assistant":
                                handle_answer_text(
                                    _assistant_text_from_sdk(message),
                                    snapshot=None,
                                )
                            elif mtype == "tool_call":
                                handle_tool_event(
                                    {
                                        "type": _sdk_attr(message, "name", default=""),
                                        "args": _sdk_attr(message, "args", default={}),
                                    },
                                    name=str(_sdk_attr(message, "name", default="")),
                                    status=str(
                                        _sdk_attr(message, "status", default="")
                                    ),
                                    call_id=str(
                                        _sdk_attr(
                                            message, "call_id", "callId", default=""
                                        )
                                        or ""
                                    ),
                                )
                            elif mtype in ("status", "task"):
                                handle_status_event(
                                    str(_sdk_attr(message, "status", default="") or ""),
                                    str(
                                        _sdk_attr(
                                            message, "message", "text", default=""
                                        )
                                        or ""
                                    ),
                                )

                        step = getattr(event, "step", None)
                        if step is not None:
                            stype = str(_sdk_attr(step, "type", default=""))
                            step_message = _sdk_attr(step, "message", default=None)
                            if stype == "thinkingMessage":
                                handle_thinking_text(
                                    str(
                                        _sdk_attr(step_message, "text", default="")
                                        or ""
                                    ),
                                    snapshot=True,
                                )
                                duration = _sdk_attr(
                                    step_message,
                                    "thinking_duration_ms",
                                    "thinkingDurationMs",
                                    default=None,
                                )
                                if duration is not None:
                                    try:
                                        thinking_ms = int(duration)
                                    except (TypeError, ValueError):
                                        pass
                                close_thinking_step(end_phase=False)
                            elif stype == "assistantMessage":
                                handle_answer_text(
                                    str(
                                        _sdk_attr(step_message, "text", default="")
                                        or ""
                                    ),
                                    snapshot=None,
                                )
                            elif stype == "toolCall":
                                handle_tool_event(
                                    step_message,
                                    name=str(
                                        _sdk_attr(step_message, "name", "type", default="")
                                    ),
                                    status=str(
                                        _sdk_attr(step_message, "status", default="")
                                    ),
                                    call_id=str(
                                        _sdk_attr(
                                            step_message,
                                            "call_id",
                                            "callId",
                                            default="",
                                        )
                                        or ""
                                    ),
                                )

                    if not cancelled:
                        result = await run.wait()
                        if str(result.status).lower().endswith("error"):
                            raise RuntimeError(
                                f"Cursor Agent завершил работу с ошибкой (run: {result.id})."
                            )
                        if not answer_parts and (result.result or "").strip():
                            handle_answer_text(
                                (result.result or "").strip(), snapshot=True
                            )
                finally:
                    try:
                        await agent.close()
                    except Exception:  # noqa: BLE001
                        pass
        except (CursorAgentError, OSError) as error:
            raise CursorStartupError(format_agent_error(error)) from error

        close_thinking_step()
        answer = "".join(answer_parts).strip()
        activity = _trim_activity(activity_log)
        thinking = "".join(thinking_parts).strip() or _activity_transcript(activity)
        if thinking_ms is not None:
            _put_event(out, "thinking_done", duration_ms=thinking_ms)
        if cancelled:
            _put_event(
                out,
                "cancelled",
                text=answer,
                thinking=thinking,
                thinking_duration_ms=thinking_ms,
                activity=activity,
            )
            return
        if not answer:
            raise RuntimeError("Cursor Agent не вернул текстовый ответ.")
        _put_event(
            out,
            "done",
            text=answer,
            thinking=thinking,
            thinking_duration_ms=thinking_ms,
            activity=activity,
        )

    try:
        from cursor_sdk import AsyncClient  # noqa: F401
    except ImportError as error:
        _put_event(
            out,
            "error",
            detail="Пакет cursor-sdk не найден. Запустите сервер через .\\run.ps1",
        )
        return

    try:
        asyncio.run(_run())
    except CursorStartupError as error:
        _put_event(out, "error", detail=f"Cursor Agent не запустился: {error}", status=502)
    except Exception as error:  # noqa: BLE001
        _put_event(out, "error", detail=format_agent_error(error), status=503)
    finally:
        out.put(None)


def claim_chat_slot(chat_id: str) -> tuple[str, threading.Event]:
    """Return ('run'|'wait', turn_event). Raise 409 if queue full."""
    with chat_queue_lock:
        state = chat_queues.setdefault(
            chat_id,
            {"running": False, "waiting": 0, "turn": threading.Event()},
        )
        if "turn" not in state:
            state["turn"] = threading.Event()
        if not state["running"]:
            state["running"] = True
            state["turn"].clear()
            return "run", state["turn"]
        if int(state["waiting"]) >= 1:
            raise HTTPException(
                status_code=409,
                detail="В этом чате уже есть запрос в очереди. Дождитесь ответа.",
            )
        state["waiting"] = 1
        return "wait", state["turn"]


def abandon_waiting_slot(chat_id: str) -> None:
    with chat_queue_lock:
        state = chat_queues.get(chat_id)
        if not state:
            return
        state["waiting"] = max(0, int(state["waiting"]) - 1)


def release_running_slot(chat_id: str) -> None:
    with chat_queue_lock:
        state = chat_queues.get(chat_id)
        if not state:
            return
        if int(state["waiting"]) > 0:
            state["waiting"] = 0
            # Promote waiter: keep running=True and signal turn.
            state["turn"].set()
            return
        state["running"] = False
        state["turn"].set()


async def wait_chat_turn(
    turn_event: threading.Event,
    cancel_event: threading.Event,
    request: Request,
) -> bool:
    while not turn_event.is_set():
        if cancel_event.is_set() or await request.is_disconnected():
            return False
        await asyncio.sleep(0.15)
    return not cancel_event.is_set()


def register_active_run(chat_id: str, cancel_event: threading.Event, user_id: str) -> None:
    with agent_status_lock:
        active_runs[chat_id] = {
            "cancel_event": cancel_event,
            "run": None,
            "loop": None,
            "thread": None,
            "user_id": user_id,
        }


def unregister_active_run(chat_id: str, cancel_event: threading.Event) -> None:
    with agent_status_lock:
        entry = active_runs.get(chat_id)
        if entry is not None and entry.get("cancel_event") is cancel_event:
            active_runs.pop(chat_id, None)


def sdk_available() -> bool:
    try:
        import cursor_sdk  # noqa: F401

        return True
    except ImportError:
        return False


class LoginRequest(BaseModel):
    username: str
    password: str


class UserCreate(BaseModel):
    username: str
    password: str
    display_name: str = ""
    role: str = "user"


class ProjectCreate(BaseModel):
    name: str
    description: str = ""
    instructions: str = ""
    icon: str = "✦"
    model: str | None = None


class ProjectUpdate(BaseModel):
    name: str | None = None
    description: str | None = None
    instructions: str | None = None
    icon: str | None = None
    model: str | None = None


class ChatCreate(BaseModel):
    project_id: str
    title: str = "Новый чат"


class ChatUpdate(BaseModel):
    title: str | None = None


class ChatOrderUpdate(BaseModel):
    chat_ids: list[str]


class AttachmentRef(BaseModel):
    id: str
    name: str = ""


class MessageCreate(BaseModel):
    role: str = "user"
    content: str
    attachments: list[AttachmentRef] = []


class BindFilesPayload(BaseModel):
    file_ids: list[str] = []


app = FastAPI(title="Helpomatica", version="1.1.0")
app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")


@app.middleware("http")
async def auth_middleware(request: Request, call_next):
    path = request.url.path
    if path.startswith("/api/") and path != "/api/auth/login":
        user = resolve_session(request.cookies.get(SESSION_COOKIE))
        if not user:
            return JSONResponse(status_code=401, content={"detail": "Требуется вход"})
        request.state.user = user
    return await call_next(request)


@app.on_event("startup")
def configure_logging() -> None:
    logging.basicConfig(level=logging.INFO)
    load_db()
    api_key = os.getenv("CURSOR_API_KEY", "").strip()
    if not api_key:
        logger.warning("CURSOR_API_KEY не задан в .env")
    else:
        logger.info("CURSOR_API_KEY загружен (%s..., len=%s)", api_key[:8], len(api_key))
    try:
        import cursor_sdk

        logger.info("cursor_sdk: %s", cursor_sdk.__file__)
    except ImportError as error:
        logger.error("cursor_sdk недоступен: %s", error)


@app.get("/")
def index() -> FileResponse:
    return FileResponse(STATIC_DIR / "index.html")


@app.post("/api/auth/login")
def login(payload: LoginRequest, response: Response) -> dict:
    username = payload.username.strip()
    password = payload.password
    if not username or not password:
        raise HTTPException(status_code=422, detail="Введите логин и пароль")
    data = load_db()
    user = next(
        (entry for entry in data["users"] if entry["username"].lower() == username.lower()),
        None,
    )
    if not user or not verify_password(password, user["password_hash"]):
        raise HTTPException(status_code=401, detail="Неверный логин или пароль")
    session_id = secrets.token_urlsafe(32)
    data["sessions"].append(
        {
            "id": session_id,
            "user_id": user["id"],
            "created_at": now(),
        }
    )
    # Keep sessions list bounded.
    if len(data["sessions"]) > 200:
        data["sessions"] = data["sessions"][-200:]
    save_db(data)
    response.set_cookie(
        key=SESSION_COOKIE,
        value=session_id,
        httponly=True,
        samesite="lax",
        max_age=SESSION_DAYS * 24 * 60 * 60,
        path="/",
    )
    return public_user(user)


@app.post("/api/auth/logout")
def logout(request: Request, response: Response) -> dict:
    session_id = request.cookies.get(SESSION_COOKIE)
    if session_id:
        data = load_db()
        data["sessions"] = [s for s in data["sessions"] if s["id"] != session_id]
        save_db(data)
    response.delete_cookie(SESSION_COOKIE, path="/")
    return {"ok": True}


@app.get("/api/auth/me")
def me(user: dict = Depends(get_current_user)) -> dict:
    return public_user(user)


@app.get("/api/users")
def list_users(_: dict = Depends(require_admin)) -> list[dict]:
    data = load_db()
    return [public_user(user) for user in sorted(data["users"], key=lambda u: u["created_at"])]


@app.post("/api/users", status_code=201)
def create_user(payload: UserCreate, _: dict = Depends(require_admin)) -> dict:
    username = payload.username.strip()
    password = payload.password
    display_name = (payload.display_name or username).strip()
    role = payload.role if payload.role in ("admin", "user") else "user"
    if not username or not password:
        raise HTTPException(status_code=422, detail="Логин и пароль обязательны")
    if len(password) < 4:
        raise HTTPException(status_code=422, detail="Пароль слишком короткий")
    data = load_db()
    if any(u["username"].lower() == username.lower() for u in data["users"]):
        raise HTTPException(status_code=409, detail="Пользователь уже существует")
    user = {
        "id": uuid.uuid4().hex,
        "username": username,
        "display_name": display_name or username,
        "password_hash": hash_password(password),
        "role": role,
        "created_at": now(),
    }
    data["users"].append(user)
    save_db(data)
    return public_user(user)


@app.get("/api/agent/status")
def agent_status(user: dict = Depends(get_current_user)) -> dict:
    api_key = bool(os.getenv("CURSOR_API_KEY", "").strip())
    with agent_status_lock:
        # Exclude wait:* placeholders — only real running agents.
        active_chat_ids = [
            key for key in active_runs.keys() if not str(key).startswith("wait:")
        ]
        busy = len(active_chat_ids) > 0
    with chat_queue_lock:
        queued = {
            chat_id: {"running": bool(state["running"]), "waiting": int(state["waiting"])}
            for chat_id, state in chat_queues.items()
            if state["running"] or int(state["waiting"]) > 0
        }
    return {
        "key_ok": api_key,
        "sdk_ok": sdk_available(),
        "busy": busy,
        "state": "busy" if busy else "idle",
        "active_chats": active_chat_ids,
        "active_count": len(active_chat_ids),
        "queues": queued,
        "model_default": default_model(),
        "user_id": user["id"],
    }


@app.get("/api/projects")
def list_projects(_: dict = Depends(get_current_user)) -> list[dict]:
    data = load_db()
    projects = []
    for project in data["projects"]:
        enriched = project.copy()
        enriched["chat_count"] = sum(
            chat["project_id"] == project["id"] for chat in data["chats"]
        )
        enriched["file_count"] = sum(
            file["project_id"] == project["id"] for file in data["files"]
        )
        projects.append(enriched)
    return sorted(projects, key=lambda item: item["updated_at"], reverse=True)


@app.post("/api/projects", status_code=201)
def create_project(payload: ProjectCreate, user: dict = Depends(get_current_user)) -> dict:
    name = payload.name.strip()
    if not name:
        raise HTTPException(status_code=422, detail="Введите название проекта")
    data = load_db()
    timestamp = now()
    project = {
        "id": uuid.uuid4().hex,
        "name": name,
        "description": payload.description.strip(),
        "instructions": payload.instructions.strip(),
        "icon": payload.icon or "✦",
        "model": (payload.model or default_model()).strip() or default_model(),
        "created_by": user["id"],
        "created_at": timestamp,
        "updated_at": timestamp,
    }
    data["projects"].append(project)
    save_db(data)
    return project


@app.patch("/api/projects/{project_id}")
def update_project(
    project_id: str,
    payload: ProjectUpdate,
    _: dict = Depends(get_current_user),
) -> dict:
    data = load_db()
    project = find(data["projects"], project_id, "Проект")
    for key, value in payload.model_dump(exclude_none=True).items():
        project[key] = value.strip() if isinstance(value, str) else value
    if not project["name"]:
        raise HTTPException(status_code=422, detail="Название не может быть пустым")
    if not project.get("model"):
        project["model"] = default_model()
    project["updated_at"] = now()
    save_db(data)
    return project


@app.delete("/api/projects/{project_id}", status_code=204)
def delete_project(project_id: str, _: dict = Depends(get_current_user)) -> None:
    data = load_db()
    find(data["projects"], project_id, "Проект")
    chat_ids = {
        chat["id"] for chat in data["chats"] if chat["project_id"] == project_id
    }
    for stored_file in [
        file for file in data["files"] if file["project_id"] == project_id
    ]:
        (UPLOAD_DIR / stored_file["stored_name"]).unlink(missing_ok=True)
    data["projects"] = [
        project for project in data["projects"] if project["id"] != project_id
    ]
    data["chats"] = [
        chat for chat in data["chats"] if chat["project_id"] != project_id
    ]
    data["messages"] = [
        message for message in data["messages"] if message["chat_id"] not in chat_ids
    ]
    data["files"] = [
        file for file in data["files"] if file["project_id"] != project_id
    ]
    save_db(data)
    shutil.rmtree(
        Path(tempfile.gettempdir()) / "helpomatica-agent" / project_id,
        ignore_errors=True,
    )
    shutil.rmtree(AGENT_DIR / project_id, ignore_errors=True)


@app.get("/api/projects/{project_id}/chats")
def list_chats(project_id: str, _: dict = Depends(get_current_user)) -> list[dict]:
    data = load_db()
    find(data["projects"], project_id, "Проект")
    chats = [chat for chat in data["chats"] if chat["project_id"] == project_id]
    chats.sort(key=lambda item: item.get("updated_at") or "", reverse=True)
    chats.sort(key=lambda item: int(item.get("sort_order", 10**9)))
    return chats


@app.put("/api/projects/{project_id}/chats/order")
def reorder_chats(
    project_id: str,
    payload: ChatOrderUpdate,
    user: dict = Depends(get_current_user),
) -> list[dict]:
    data = load_db()
    find(data["projects"], project_id, "Проект")
    project_chats = {
        chat["id"]: chat
        for chat in data["chats"]
        if chat["project_id"] == project_id
    }
    if not payload.chat_ids:
        raise HTTPException(status_code=422, detail="Передайте упорядоченный список чатов")
    if len(payload.chat_ids) != len(set(payload.chat_ids)):
        raise HTTPException(status_code=422, detail="Список чатов содержит дубликаты")
    if set(payload.chat_ids) != set(project_chats):
        raise HTTPException(status_code=422, detail="Список чатов не совпадает с проектом")
    timestamp = now()
    for index, chat_id in enumerate(payload.chat_ids):
        chat = project_chats[chat_id]
        chat["sort_order"] = index
        chat["updated_by"] = user["id"]
    project = find(data["projects"], project_id, "Проект")
    project["updated_at"] = timestamp
    save_db(data)
    return sorted(
        [project_chats[chat_id] for chat_id in payload.chat_ids],
        key=lambda item: item.get("sort_order", 0),
    )


@app.post("/api/chats", status_code=201)
def create_chat(payload: ChatCreate, user: dict = Depends(get_current_user)) -> dict:
    data = load_db()
    project = find(data["projects"], payload.project_id, "Проект")
    timestamp = now()
    project_orders = [
        int(chat.get("sort_order", 0))
        for chat in data["chats"]
        if chat["project_id"] == payload.project_id
    ]
    next_order = (min(project_orders) - 1) if project_orders else 0
    chat = {
        "id": uuid.uuid4().hex,
        "project_id": payload.project_id,
        "title": payload.title.strip() or "Новый чат",
        "sort_order": next_order,
        "created_by": user["id"],
        "updated_by": user["id"],
        "created_at": timestamp,
        "updated_at": timestamp,
    }
    data["chats"].append(chat)
    project["updated_at"] = timestamp
    save_db(data)
    return chat


@app.patch("/api/chats/{chat_id}")
def update_chat(
    chat_id: str,
    payload: ChatUpdate,
    user: dict = Depends(get_current_user),
) -> dict:
    data = load_db()
    chat = find(data["chats"], chat_id, "Чат")
    if payload.title is not None:
        title = payload.title.strip()
        if not title:
            raise HTTPException(status_code=422, detail="Название не может быть пустым")
        chat["title"] = title
    chat["updated_by"] = user["id"]
    chat["updated_at"] = now()
    save_db(data)
    return chat


@app.delete("/api/chats/{chat_id}", status_code=204)
def delete_chat(chat_id: str, _: dict = Depends(get_current_user)) -> None:
    data = load_db()
    find(data["chats"], chat_id, "Чат")
    data["chats"] = [chat for chat in data["chats"] if chat["id"] != chat_id]
    data["messages"] = [
        message for message in data["messages"] if message["chat_id"] != chat_id
    ]
    leftover: list[dict] = []
    for stored_file in data["files"]:
        if file_scope_of(stored_file) == "chat" and stored_file.get("chat_id") == chat_id:
            (UPLOAD_DIR / stored_file["stored_name"]).unlink(missing_ok=True)
            continue
        leftover.append(stored_file)
    data["files"] = leftover
    save_db(data)


@app.get("/api/chats/{chat_id}/messages")
def list_messages(chat_id: str, _: dict = Depends(get_current_user)) -> list[dict]:
    data = load_db()
    find(data["chats"], chat_id, "Чат")
    return [
        message for message in data["messages"] if message["chat_id"] == chat_id
    ]


@app.get("/api/chats/{chat_id}/export")
def export_chat(chat_id: str, _: dict = Depends(get_current_user)) -> Response:
    data = load_db()
    chat = find(data["chats"], chat_id, "Чат")
    project = find(data["projects"], chat["project_id"], "Проект")
    messages = [message for message in data["messages"] if message["chat_id"] == chat_id]
    markdown = export_chat_markdown(chat, project, messages)
    title = re.sub(r'[<>:"/\\|?*]+', "_", str(chat.get("title") or "chat"))[:80] or "chat"
    return Response(
        content=markdown.encode("utf-8"),
        media_type="text/markdown; charset=utf-8",
        headers={"Content-Disposition": attachment_filename(f"{title}.md", "chat.md")},
    )


@app.post("/api/chats/{chat_id}/messages", status_code=201)
def create_message(
    chat_id: str,
    payload: MessageCreate,
    user: dict = Depends(get_current_user),
) -> dict:
    data = load_db()
    chat = find(data["chats"], chat_id, "Чат")
    content = payload.content.strip()
    if not content:
        raise HTTPException(status_code=422, detail="Сообщение не может быть пустым")
    timestamp = now()
    role = payload.role if payload.role in ("user", "assistant") else "user"
    attachments: list[dict] = []
    if role == "user" and payload.attachments:
        project_files = {
            entry["id"]: entry
            for entry in data["files"]
            if entry.get("project_id") == chat["project_id"]
        }
        seen: set[str] = set()
        for ref in payload.attachments:
            file_id = (ref.id or "").strip()
            if not file_id or file_id in seen:
                continue
            entry = project_files.get(file_id)
            if not entry:
                continue
            seen.add(file_id)
            other_chat = entry.get("chat_id")
            if (
                file_scope_of(entry) == "chat"
                and other_chat
                and other_chat != chat_id
            ):
                continue
            if file_scope_of(entry) != "chat" or entry.get("chat_id") != chat_id:
                entry["scope"] = "chat"
                entry["chat_id"] = chat_id
            attachments.append({"id": entry["id"], "name": entry["name"]})
    message = {
        "id": uuid.uuid4().hex,
        "chat_id": chat_id,
        "role": role,
        "content": content,
        "attachments": attachments,
        "user_id": user["id"] if role == "user" else None,
        "author_name": (
            user.get("display_name") or user.get("username")
            if role == "user"
            else "Помощник"
        ),
        "created_at": timestamp,
    }
    data["messages"].append(message)
    if chat["title"] == "Новый чат" and role == "user":
        title_source = re.sub(
            r"\n\n\[Прикреплённые файлы проекта:\s*[^\]]+\]\s*$",
            "",
            content,
        ).strip() or content
        chat["title"] = title_source[:55] + ("…" if len(title_source) > 55 else "")
    chat["updated_at"] = timestamp
    chat["updated_by"] = user["id"]
    project = find(data["projects"], chat["project_id"], "Проект")
    project["updated_at"] = timestamp
    save_db(data)
    return message


def save_assistant_message(
    chat_id: str,
    content: str,
    thinking: str = "",
    thinking_duration_ms: int | None = None,
    activity: list[dict] | None = None,
) -> dict | None:
    content = (content or "").strip()
    if not content:
        return None
    data = load_db()
    chat = find(data["chats"], chat_id, "Чат")
    timestamp = now()
    thinking_text = (thinking or "").strip()
    if len(thinking_text) > 80_000:
        thinking_text = thinking_text[:80_000] + "\n…"
    message = {
        "id": uuid.uuid4().hex,
        "chat_id": chat_id,
        "role": "assistant",
        "content": content,
        "thinking": thinking_text,
        "thinking_duration_ms": thinking_duration_ms,
        "activity": _trim_activity(activity or []),
        "user_id": None,
        "author_name": "Помощник",
        "created_at": timestamp,
    }
    data["messages"].append(message)
    chat["updated_at"] = timestamp
    project = find(data["projects"], chat["project_id"], "Проект")
    project["updated_at"] = timestamp
    save_db(data)
    return message


@app.post("/api/chats/{chat_id}/respond")
async def generate_response(
    chat_id: str,
    request: Request,
    user: dict = Depends(get_current_user),
) -> StreamingResponse:
    data = load_db()
    chat = find(data["chats"], chat_id, "Чат")
    project = find(data["projects"], chat["project_id"], "Проект")
    messages = [
        message for message in data["messages"] if message["chat_id"] == chat_id
    ]
    if not messages or messages[-1]["role"] != "user":
        raise HTTPException(status_code=409, detail="Сначала отправьте сообщение")

    slot, turn_event = claim_chat_slot(chat_id)
    cancel_event = threading.Event()
    out: queue.Queue = queue.Queue()
    if slot == "run":
        register_active_run(chat_id, cancel_event, user["id"])
    else:
        # Queued request is cancellable via its own cancel_event stored lightly.
        with agent_status_lock:
            active_runs.setdefault(
                f"wait:{chat_id}",
                {
                    "cancel_event": cancel_event,
                    "run": None,
                    "loop": None,
                    "thread": None,
                    "user_id": user["id"],
                },
            )

    async def event_stream() -> AsyncIterator[str]:
        became_runner = slot == "run"
        try:
            if slot == "wait":
                yield sse_format("status", {"state": "queued", "detail": "В очереди…"})
                got_turn = await wait_chat_turn(turn_event, cancel_event, request)
                with agent_status_lock:
                    active_runs.pop(f"wait:{chat_id}", None)
                if not got_turn:
                    yield sse_format("cancelled", {"text": ""})
                    return
                became_runner = True
                register_active_run(chat_id, cancel_event, user["id"])

            # No global agent lock: each chat launches its own local bridge.
            yield sse_format("status", {"state": "starting", "detail": "Запуск…"})

            fresh = load_db()
            fresh_chat = find(fresh["chats"], chat_id, "Чат")
            fresh_project = find(fresh["projects"], fresh_chat["project_id"], "Проект")
            fresh_messages = [
                message for message in fresh["messages"] if message["chat_id"] == chat_id
            ]
            if not fresh_messages or fresh_messages[-1]["role"] != "user":
                yield sse_format("error", {"detail": "Сначала отправьте сообщение"})
                return

            deduplicated: list[dict] = []
            for message in fresh_messages:
                if (
                    deduplicated
                    and deduplicated[-1]["role"] == message["role"]
                    and deduplicated[-1]["content"] == message["content"]
                ):
                    continue
                deduplicated.append(message)
            history = "\n\n".join(
                f"{'Пользователь' if message['role'] == 'user' else 'Ассистент'}: "
                f"{message['content']}"
                for message in deduplicated[-30:]
            )
            query = deduplicated[-1]["content"]
            attachment_ids = message_attachment_ids(fresh_messages)
            scoped_files = iter_scoped_files(fresh, fresh_project["id"], chat_id)
            file_context, context_files = build_file_context(
                fresh,
                fresh_project["id"],
                query,
                chat_id=chat_id,
                attachment_ids=attachment_ids,
            )
            model = (fresh_project.get("model") or default_model()).strip() or default_model()
            workspace = prepare_agent_workspace(
                fresh_project,
                fresh,
                query,
                chat_id=chat_id,
                attachment_ids=attachment_ids,
                messages=fresh_messages,
            )

            chip_groups = build_context_chip_groups(
                fresh, fresh_project["id"], chat_id, fresh_messages
            )
            yield sse_format(
                "context",
                {**chip_groups, "files": context_files, "model": model},
            )

            log_entries = log_preanalysis.rank_log_files(scoped_files)
            log_names = [str(entry.get("name") or "") for entry in log_entries]
            run_preanalysis = bool(
                log_entries and log_preanalysis.looks_like_log_job(query, log_names)
            )
            cache_hit = lookup_analysis_cache(
                fresh, fresh_project["id"], scoped_files, query
            )
            preanalysis_md = ""
            preanalysis_summary = ""
            pre_activity: list[dict] = []
            if run_preanalysis:
                if cache_hit and cache_hit.get("preanalysis"):
                    preanalysis_md = str(cache_hit.get("preanalysis") or "")
                    preanalysis_summary = str(cache_hit.get("summary") or "")
                    yield sse_format(
                        "progress",
                        {
                            "phase": "cache",
                            "message": "Есть предыдущий разбор",
                            "percent": 100,
                        },
                    )
                    pre_step = {
                        "id": "pre-scan",
                        "type": "status",
                        "title": "Логи",
                        "detail": preanalysis_summary or "Кэш предыдущего разбора",
                        "status": "completed",
                    }
                    pre_activity.append(pre_step)
                    yield sse_format("activity", pre_step)
                else:
                    yield sse_format(
                        "status",
                        {"state": "scanning", "detail": "Читаю лог… 0%"},
                    )
                    prog_q: queue.Queue = queue.Queue()

                    def on_progress(info: dict) -> None:
                        prog_q.put(("p", info))

                    scan_files = [
                        (resolve_upload_path(entry), log_display_name(entry))
                        for entry in log_entries
                    ]

                    def run_scan() -> None:
                        try:
                            result = log_preanalysis.preanalyze_logs(
                                scan_files,
                                query,
                                on_progress=on_progress,
                                cancel=cancel_event.is_set,
                            )
                            prog_q.put(("done", result))
                        except Exception as error:  # noqa: BLE001
                            logger.exception("preanalysis failed")
                            prog_q.put(("err", format_agent_error(error)))

                    threading.Thread(target=run_scan, daemon=True).start()
                    scan_result: dict | None = None
                    while True:
                        kind, payload = await asyncio.to_thread(prog_q.get)
                        if kind == "p":
                            yield sse_format("progress", payload)
                            detail = str(payload.get("message") or "Читаю лог…")
                            yield sse_format(
                                "status",
                                {"state": "scanning", "detail": detail},
                            )
                            step = {
                                "id": "pre-scan",
                                "type": "status",
                                "title": "Логи",
                                "detail": detail,
                                "status": "running",
                            }
                            if not pre_activity:
                                pre_activity.append(step)
                            else:
                                pre_activity[0].update(step)
                            yield sse_format("activity", step)
                        elif kind == "done":
                            scan_result = payload if isinstance(payload, dict) else None
                            break
                        else:
                            logger.warning("preanalysis error: %s", payload)
                            break
                    if scan_result:
                        preanalysis_md = str(scan_result.get("markdown") or "")
                        preanalysis_summary = str(scan_result.get("summary") or "")
                    if pre_activity:
                        pre_activity[0]["status"] = "completed"
                        pre_activity[0]["detail"] = (
                            preanalysis_summary or pre_activity[0].get("detail") or "Готово"
                        )
                        yield sse_format("activity", pre_activity[0])
                if preanalysis_md:
                    try:
                        log_preanalysis.write_preanalysis_md(workspace, preanalysis_md)
                    except OSError as error:
                        logger.warning("PREANALYSIS.md write failed: %s", error)

            extra = _prompt_extra_from_cache_and_scan(cache_hit, preanalysis_md)
            prompt = build_chat_prompt(fresh_project, file_context, history, extra=extra)
            yield sse_format(
                "progress",
                {
                    "phase": "agent",
                    "message": "Думаю…",
                    "percent": None,
                },
            )
            yield sse_format("status", {"state": "streaming", "detail": "Думаю…"})

            thread = threading.Thread(
                target=_stream_cursor_agent_threaded,
                args=(prompt, workspace, model, chat_id, out, cancel_event),
                daemon=True,
            )
            with agent_status_lock:
                entry = active_runs.get(chat_id)
                if entry is not None:
                    entry["thread"] = thread
            thread.start()

            final_text = ""
            thinking_text = ""
            thinking_ms = None
            activity_items: list[dict] = list(pre_activity)
            terminal = None
            while True:
                item = await asyncio.to_thread(out.get)
                if item is None:
                    break
                event_type = item.get("type", "status")
                if event_type == "thinking":
                    chunk = item.get("text") or ""
                    thinking_text += chunk
                    yield sse_format("thinking", {"text": chunk, "replace": False})
                elif event_type == "activity":
                    payload = item.get("step") or {
                        k: v for k, v in item.items() if k != "type"
                    }
                    existing = next(
                        (
                            step
                            for step in activity_items
                            if payload.get("id") and step.get("id") == payload.get("id")
                        ),
                        None,
                    )
                    if existing is not None:
                        existing.update({k: v for k, v in payload.items() if v is not None})
                    else:
                        activity_items.append(payload)
                    yield sse_format("activity", payload)
                elif event_type == "thinking_done":
                    duration = item.get("duration_ms")
                    if duration is not None:
                        try:
                            thinking_ms = int(duration)
                        except (TypeError, ValueError):
                            pass
                    yield sse_format("thinking_done", {"duration_ms": thinking_ms})
                elif event_type == "delta":
                    chunk = item.get("text") or ""
                    if item.get("replace"):
                        final_text = chunk
                    else:
                        final_text += chunk
                    yield sse_format(
                        "delta",
                        {"text": chunk, "replace": bool(item.get("replace"))},
                    )
                elif event_type == "done":
                    final_text = item.get("text") or final_text
                    thinking_text = item.get("thinking") or thinking_text
                    if item.get("thinking_duration_ms") is not None:
                        thinking_ms = item.get("thinking_duration_ms")
                    if item.get("activity"):
                        activity_items = _trim_activity(
                            list(pre_activity) + (item.get("activity") or [])
                        )
                    terminal = "done"
                    message = save_assistant_message(
                        chat_id,
                        final_text,
                        thinking=thinking_text,
                        thinking_duration_ms=thinking_ms,
                        activity=activity_items,
                    )
                    try:
                        store_analysis_cache(
                            fresh_project["id"],
                            scoped_files,
                            query,
                            final_text,
                            preanalysis=preanalysis_md,
                            summary=preanalysis_summary,
                        )
                    except Exception as cache_error:  # noqa: BLE001
                        logger.warning("analysis cache store failed: %s", cache_error)
                    yield sse_format("done", {"text": final_text, "message": message})
                elif event_type == "cancelled":
                    final_text = item.get("text") or final_text
                    thinking_text = item.get("thinking") or thinking_text
                    if item.get("thinking_duration_ms") is not None:
                        thinking_ms = item.get("thinking_duration_ms")
                    if item.get("activity"):
                        activity_items = _trim_activity(item.get("activity") or [])
                    terminal = "cancelled"
                    message = save_assistant_message(
                        chat_id,
                        final_text,
                        thinking=thinking_text,
                        thinking_duration_ms=thinking_ms,
                        activity=activity_items,
                    )
                    yield sse_format(
                        "cancelled",
                        {"text": final_text, "message": message},
                    )
                elif event_type == "error":
                    terminal = "error"
                    yield sse_format(
                        "error",
                        {"detail": item.get("detail", "Ошибка агента")},
                    )
                else:
                    yield sse_format(event_type, {k: v for k, v in item.items() if k != "type"})

            if terminal is None and final_text:
                message = save_assistant_message(
                    chat_id,
                    final_text,
                    thinking=thinking_text,
                    thinking_duration_ms=thinking_ms,
                    activity=activity_items,
                )
                try:
                    store_analysis_cache(
                        fresh_project["id"],
                        scoped_files,
                        query,
                        final_text,
                        preanalysis=preanalysis_md,
                        summary=preanalysis_summary,
                    )
                except Exception as cache_error:  # noqa: BLE001
                    logger.warning("analysis cache store failed: %s", cache_error)
                yield sse_format("done", {"text": final_text, "message": message})
            elif terminal is None and cancel_event.is_set():
                yield sse_format("cancelled", {"text": ""})
        except HTTPException as error:
            yield sse_format("error", {"detail": error.detail})
        except Exception as error:  # noqa: BLE001
            logger.exception("respond failed chat=%s", chat_id)
            yield sse_format("error", {"detail": format_agent_error(error)})
        finally:
            unregister_active_run(chat_id, cancel_event)
            with agent_status_lock:
                wait_entry = active_runs.get(f"wait:{chat_id}")
                if wait_entry and wait_entry.get("cancel_event") is cancel_event:
                    active_runs.pop(f"wait:{chat_id}", None)
            if became_runner:
                release_running_slot(chat_id)
            elif slot == "wait":
                abandon_waiting_slot(chat_id)

    return StreamingResponse(
        event_stream(),
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "Connection": "keep-alive",
            "X-Accel-Buffering": "no",
        },
    )


@app.post("/api/chats/{chat_id}/cancel")
async def cancel_response(
    chat_id: str,
    _: dict = Depends(get_current_user),
) -> dict:
    with agent_status_lock:
        entry = active_runs.get(chat_id) or active_runs.get(f"wait:{chat_id}")
        if not entry:
            raise HTTPException(status_code=404, detail="Нет активной генерации")
        entry["cancel_event"].set()
        run = entry.get("run")
        loop = entry.get("loop")
    if run is not None and loop is not None:
        try:
            fut = asyncio.run_coroutine_threadsafe(run.cancel(), loop)
            fut.result(timeout=5)
        except Exception as error:  # noqa: BLE001
            logger.warning("cancel_run chat=%s: %s", chat_id, error)
    return {"ok": True, "chat_id": chat_id}


@app.get("/api/search")
def search_chats(q: str = "", _: dict = Depends(get_current_user)) -> list[dict]:
    needle = (q or "").strip()
    if len(needle) < 2:
        return []
    needle_l = needle.lower()
    data = load_db()
    projects_by_id = {item["id"]: item for item in data.get("projects") or []}
    chats_by_id = {item["id"]: item for item in data.get("chats") or []}
    results: list[dict] = []

    def add_result(
        chat: dict,
        *,
        match_in: str,
        snippet: str,
        message_id: str = "",
    ) -> None:
        if len(results) >= 30:
            return
        project = projects_by_id.get(chat.get("project_id") or "")
        results.append(
            {
                "chat_id": chat["id"],
                "project_id": chat.get("project_id") or "",
                "project_name": (project or {}).get("name") or "",
                "chat_title": chat.get("title") or "Чат",
                "message_id": message_id,
                "match_in": match_in,
                "snippet": snippet[:240],
            }
        )

    for chat in sorted(
        data.get("chats") or [],
        key=lambda item: item.get("updated_at") or "",
        reverse=True,
    ):
        title = str(chat.get("title") or "")
        if needle_l in title.lower():
            add_result(chat, match_in="title", snippet=title)
        if len(results) >= 30:
            return results

    for message in reversed(data.get("messages") or []):
        if len(results) >= 30:
            break
        content = str(message.get("content") or "")
        if needle_l not in content.lower():
            continue
        chat = chats_by_id.get(message.get("chat_id") or "")
        if not chat:
            continue
        add_result(
            chat,
            match_in="message",
            snippet=snippet_around(content, needle),
            message_id=str(message.get("id") or ""),
        )
    return results[:30]


@app.get("/api/projects/{project_id}/files")
def list_files(
    project_id: str,
    chat_id: str | None = None,
    _: dict = Depends(get_current_user),
) -> list[dict]:
    data = load_db()
    find(data["projects"], project_id, "Проект")
    bound_chat_id = (chat_id or "").strip() or None
    if bound_chat_id:
        chat = find(data["chats"], bound_chat_id, "Чат")
        if chat["project_id"] != project_id:
            raise HTTPException(status_code=400, detail="Чат не принадлежит проекту")
        return iter_scoped_files(data, project_id, bound_chat_id)
    return [
        file
        for file in data["files"]
        if file["project_id"] == project_id and file_scope_of(file) == "project"
    ]


@app.post("/api/projects/{project_id}/files", status_code=201)
def upload_file(
    project_id: str,
    request: Request,
    file: UploadFile = File(...),
    label: str = Form(default=""),
    chat_id: str | None = Form(default=None),
    file_scope: str | None = Form(default=None, alias="scope"),
    _: dict = Depends(get_current_user),
) -> dict:
    data = load_db()
    project = find(data["projects"], project_id, "Проект")
    query_chat = (request.query_params.get("chat_id") or "").strip() or None
    query_scope = (request.query_params.get("scope") or "").strip().lower()
    bound_chat_id = (chat_id or "").strip() or query_chat
    requested_scope = ((file_scope or "").strip().lower() or query_scope)
    if requested_scope == "chat" and not bound_chat_id:
        raise HTTPException(
            status_code=400,
            detail="Для файлов чата нужен chat_id",
        )
    stored_scope = "project"
    if bound_chat_id:
        chat = find(data["chats"], bound_chat_id, "Чат")
        if chat["project_id"] != project_id:
            raise HTTPException(status_code=400, detail="Чат не принадлежит проекту")
        stored_scope = "chat"
    original_name = Path(file.filename or "file").name
    stored_name = f"{uuid.uuid4().hex}_{original_name}"
    destination = UPLOAD_DIR / stored_name
    with destination.open("wb") as output:
        shutil.copyfileobj(file.file, output)
    entry = {
        "id": uuid.uuid4().hex,
        "project_id": project_id,
        "chat_id": bound_chat_id,
        "scope": stored_scope,
        "name": original_name,
        "label": label.strip(),
        "stored_name": stored_name,
        "content_type": file.content_type or "application/octet-stream",
        "size": destination.stat().st_size,
        "created_at": now(),
    }
    data["files"].append(entry)
    project["updated_at"] = now()
    save_db(data)
    logger.info(
        "upload file project=%s scope=%s chat_id=%s name=%s",
        project_id,
        stored_scope,
        bound_chat_id,
        original_name,
    )
    return entry


@app.post("/api/chats/{chat_id}/files/bind")
def bind_files_to_chat(
    chat_id: str,
    payload: BindFilesPayload,
    _: dict = Depends(get_current_user),
) -> list[dict]:
    data = load_db()
    chat = find(data["chats"], chat_id, "Чат")
    bound: list[dict] = []
    seen: set[str] = set()
    for file_id in payload.file_ids:
        fid = (file_id or "").strip()
        if not fid or fid in seen:
            continue
        seen.add(fid)
        entry = next(
            (
                item
                for item in data["files"]
                if item.get("id") == fid and item.get("project_id") == chat["project_id"]
            ),
            None,
        )
        if not entry:
            continue
        other_chat = entry.get("chat_id")
        if file_scope_of(entry) == "chat" and other_chat and other_chat != chat_id:
            continue
        entry["scope"] = "chat"
        entry["chat_id"] = chat_id
        bound.append(entry)
    chat["updated_at"] = now()
    save_db(data)
    return bound


@app.get("/api/files/{file_id}")
def download_file(file_id: str, _: dict = Depends(get_current_user)) -> FileResponse:
    data = load_db()
    stored_file = find(data["files"], file_id, "Файл")
    if not file_in_user_scope(data, stored_file):
        raise HTTPException(status_code=404, detail="Файл не найден")
    path = UPLOAD_DIR / stored_file["stored_name"]
    if not path.exists():
        raise HTTPException(status_code=404, detail="Файл не найден на диске")
    original_name = stored_file.get("name") or path.name
    return FileResponse(
        path,
        filename=original_name,
        media_type=stored_file.get("content_type") or "application/octet-stream",
        content_disposition_type="attachment",
    )


@app.get("/api/files/{file_id}/excerpt")
def download_file_excerpt(
    file_id: str,
    start: int | None = Query(default=None, ge=1),
    end: int | None = Query(default=None, ge=1),
    line: int | None = Query(default=None, ge=1),
    window: int = Query(default=25, ge=1, le=200),
    from_line: int | None = Query(default=None, alias="from", ge=1),
    to_line: int | None = Query(default=None, alias="to", ge=1),
    _: dict = Depends(get_current_user),
) -> Response:
    data = load_db()
    stored_file = find(data["files"], file_id, "Файл")
    if not file_in_user_scope(data, stored_file):
        raise HTTPException(status_code=404, detail="Файл не найден")
    path = UPLOAD_DIR / stored_file["stored_name"]
    if not path.exists():
        raise HTTPException(status_code=404, detail="Файл не найден на диске")
    start_line = start or from_line
    end_line = end or to_line
    if line is not None:
        start_line = max(1, line - window)
        end_line = line + window
    if start_line is None:
        start_line = 1
    if end_line is None:
        end_line = start_line + window
    if end_line < start_line:
        start_line, end_line = end_line, start_line
    if end_line - start_line > 500:
        end_line = start_line + 500
    try:
        text, _encoding = log_preanalysis.excerpt_lines(path, start_line, end_line)
    except OSError as error:
        raise HTTPException(status_code=500, detail=f"Не удалось прочитать лог: {error}") from error
    original = stored_file.get("name") or path.name
    filename = f"{Path(original).name}.{start_line}-{end_line}.txt"
    return Response(
        content=text.encode("utf-8"),
        media_type="text/plain; charset=utf-8",
        headers={"Content-Disposition": attachment_filename(filename, "excerpt.txt")},
    )


@app.delete("/api/files/{file_id}", status_code=204)
def delete_file(file_id: str, _: dict = Depends(get_current_user)) -> None:
    data = load_db()
    stored_file = find(data["files"], file_id, "Файл")
    (UPLOAD_DIR / stored_file["stored_name"]).unlink(missing_ok=True)
    data["files"] = [file for file in data["files"] if file["id"] != file_id]
    save_db(data)