"""Документация оборудования (Nextcloud): настройки и проверка (администратор портала), проводник для привязки папок
(администратор и модератор), просмотр документов машины (кто видит машину), индекс и поиск для AI-помощника."""
import asyncio
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query
from fastapi.responses import FileResponse
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from .. import docs_index as DI, nextcloud as nc, scope, settings_store as ss
from ..db import SessionLocal, get_db
from ..models import DocIndex, Equipment, User
from ..security import current_user, require_manager, require_portal_admin
from .catalog import commit, get_or_404

router = APIRouter(tags=["docs"])
SECRETS = ("nc_password", "onlyoffice_jwt")
NOSNIFF = {"X-Content-Type-Options": "nosniff", "Cache-Control": "private, max-age=300"}


class DocsConfigIn(BaseModel):
    nc_url: Optional[str] = Field(default=None, max_length=300)
    nc_user: Optional[str] = Field(default=None, max_length=200)
    nc_password: Optional[str] = Field(default=None, max_length=500)       # пустая строка — удалить; null — не менять
    nc_root: Optional[str] = Field(default=None, max_length=500)
    onlyoffice_url: Optional[str] = Field(default=None, max_length=300)
    onlyoffice_jwt: Optional[str] = Field(default=None, max_length=500)
    portal_internal_url: Optional[str] = Field(default=None, max_length=300)
    docs_ai: Optional[bool] = None


class LinkIn(BaseModel):
    path: str = Field(default="", max_length=500)  # пусто — отвязать


def public_cfg(db: Session) -> dict:
    out = {k: ss.get(db, k) for k in ("nc_url", "nc_user", "nc_root", "onlyoffice_url", "portal_internal_url", "docs_index_at")}
    out.update({k + "_set": bool(ss.get(db, k)) for k in SECRETS})
    out["docs_ai"] = DI.enabled(db)
    out["index"] = {**DI.state, "files": db.query(DocIndex).count(), "linked": db.query(Equipment).filter(Equipment.docs_path != "").count()}
    return out


def _fail(e: nc.DocsError):
    msg = str(e)
    code = 502 if any(w in msg for w in ("недоступен", "ответил", "отклонил", "не отдал", "не смог")) else 404 if "не найден" in msg else 422
    raise HTTPException(code, msg)


@router.get("/docs/config")
def get_config(db: Session = Depends(get_db), _: User = Depends(require_portal_admin)):
    return public_cfg(db)


@router.put("/docs/config")
def put_config(data: DocsConfigIn, db: Session = Depends(get_db), _: User = Depends(require_portal_admin)):
    d = data.model_dump(exclude_unset=True)
    for k in ("nc_url", "onlyoffice_url", "portal_internal_url"):
        if d.get(k) and not d[k].strip().lower().startswith(("https://", "http://")):
            raise HTTPException(422, "Адрес должен начинаться с http:// или https://")
    try:
        if d.get("nc_root") is not None:
            d["nc_root"] = nc.clean(d["nc_root"])
    except nc.DocsError as e:
        raise HTTPException(422, str(e))
    for k, v in d.items():
        if v is None:
            continue
        if isinstance(v, bool):
            v = "1" if v else "0"
        ss.set_(db, k, v.strip().rstrip("/") if k.endswith("url") else v.strip())
    commit(db)
    return public_cfg(db)


@router.post("/docs/test")
def test(db: Session = Depends(get_db), _: User = Depends(require_portal_admin)):
    try:
        return nc.check(nc.conf(db))
    except nc.DocsError as e:
        _fail(e)


@router.get("/docs/browse")
def browse(path: str = "", db: Session = Depends(get_db), _: User = Depends(require_manager)):
    """Проводник по документации для привязки папок к машинам: только папки и сколько в папке файлов."""
    try:
        rel = nc.clean(path)
        items = nc.listdir(nc.conf(db), rel)
    except nc.DocsError as e:
        _fail(e)
    linked: dict[str, list[str]] = {}
    for name, p in db.query(Equipment.name, Equipment.docs_path).filter(Equipment.docs_path != ""):
        linked.setdefault(p, []).append(name)
    return {"path": rel, "items": [{**x, "linked": linked.get(x["path"], [])} for x in items if x["is_dir"]],
            "files": sum(not x["is_dir"] for x in items)}


@router.put("/equipment/{id}/docs")
def link(id: int, data: LinkIn, db: Session = Depends(get_db), _: User = Depends(require_manager)):
    eq = get_or_404(db, Equipment, id)
    try:
        rel = nc.clean(data.path)
        if rel:
            nc.listdir(nc.conf(db), rel)  # папка должна существовать
    except nc.DocsError as e:
        _fail(e)
    if rel != eq.docs_path:
        db.query(DocIndex).filter(DocIndex.equipment_id == id).delete()
    eq.docs_path = rel
    commit(db)
    return {"id": eq.id, "docs_path": eq.docs_path}


def _equipment(db: Session, u: User, id: int) -> Equipment:
    eq = get_or_404(db, Equipment, id)
    if not scope.user_sees(db, u, eq):
        raise HTTPException(404, "Не найдено")
    if not eq.docs_path:
        raise HTTPException(404, "К машине не привязана папка документации")
    return eq


@router.get("/equipment/{id}/docs")
def equipment_docs(id: int, sub: str = "", db: Session = Depends(get_db), u: User = Depends(current_user)):
    """Содержимое папки документации машины (sub — вложенная папка)."""
    eq = _equipment(db, u, id)
    base = nc.clean(eq.docs_path)
    try:
        sub = nc.clean(sub)
        items = nc.listdir(nc.conf(db), nc.join(base, sub))
    except nc.DocsError as e:
        _fail(e)
    return {"equipment_id": eq.id, "folder": base.rsplit("/", 1)[-1], "sub": sub,
            "items": [{**x, "path": x["path"][len(base):].strip("/")} for x in items]}


@router.get("/equipment/{id}/docs/file")
def equipment_file(id: int, path: str = Query(min_length=1, max_length=1000), view: bool = False,
                   db: Session = Depends(get_db), u: User = Depends(current_user)):
    """Файл документации. view=1 — для просмотра: PDF, картинки и текст как есть, Office — PDF через ONLYOFFICE."""
    eq = _equipment(db, u, id)
    c = nc.conf(db)
    try:
        info = nc.stat(c, nc.join(eq.docs_path, nc.clean(path, allow_empty=False)))
        if info["is_dir"]:
            raise nc.DocsError("Это папка, а не файл")
        k = info["kind"]
        if view and k == "office":
            return FileResponse(nc.to_pdf(c, info), media_type="application/pdf", headers=NOSNIFF,
                                filename=info["name"].rsplit(".", 1)[0] + ".pdf", content_disposition_type="inline")
        f = nc.fetch(c, info)
    except nc.DocsError as e:
        _fail(e)
    inline = view and k in ("pdf", "image", "text")
    media = {"pdf": "application/pdf", "text": "text/plain; charset=utf-8"}.get(k) or nc.IMAGES.get(nc.ext_of(info["name"]))
    return FileResponse(f, media_type=media if inline else "application/octet-stream", filename=info["name"], headers=NOSNIFF,
                        content_disposition_type="inline" if inline else "attachment")


@router.get("/docs/raw/{token}", include_in_schema=False)
def raw(token: str):
    """Исходник для ONLYOFFICE по короткой подписанной ссылке (без входа)."""
    try:
        f = nc.check_raw_token(token)
    except nc.DocsError as e:
        raise HTTPException(404, str(e))
    return FileResponse(f, media_type="application/octet-stream", headers={"X-Content-Type-Options": "nosniff"})


# ---------- индекс и поиск (опция «Работа с документацией») ----------
def _rebuild_bg():
    with SessionLocal() as db:
        DI.rebuild(db)


@router.post("/docs/reindex", status_code=202)
async def reindex(db: Session = Depends(get_db), _: User = Depends(require_portal_admin)):
    if not DI.enabled(db):
        raise HTTPException(422, "Сначала включите «Работа с документацией»")
    if not DI.state["running"]:
        asyncio.get_running_loop().run_in_executor(None, _rebuild_bg)
    return {"started": True}


@router.get("/docs/search")
def search(q: str = Query(min_length=2, max_length=200), db: Session = Depends(get_db), u: User = Depends(current_user)):
    if not DI.enabled(db):
        raise HTTPException(404, "Работа с документацией выключена")
    return DI.search(db, u, q)