#!/usr/bin/env python3
"""
Sincroniza metadatos Jellyfin (descripción, género, valoración, duración, carátulas)
y enlaces M3U → Dispatcharr para películas y series + episodios.

Ejecución: **dentro del LXC Dispatcharr** (usa ORM Django; la API pública VOD es solo lectura).

Ejemplo:
  set -a; source /opt/dispatcharr/.env; set +a
  # Opcional: DISPATCHARR_JELLYFIN_API_KEY en /etc/dispatcharr-jellyfin.env (se carga sola)
  cd /opt/dispatcharr && .venv/bin/python /opt/dispatcharr/scripts/jellyfin_vod_sync_dispatcharr.py

Opciones:
  --dry-run
  --movies-only / --series-only
  --m3u-account "Biblioteca Jellyfin (sandbox)"
  --movie-category / --series-category nombres de VODCategory existentes (se crean si no existen)
"""

from __future__ import annotations

import argparse
import os
import sys
from pathlib import Path
from typing import Any, Optional

import httpx

# --- Django bootstrap ---
_REPO = Path("/opt/dispatcharr")
if str(_REPO) not in sys.path:
    sys.path.insert(0, str(_REPO))
os.chdir(_REPO)
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "dispatcharr.settings")


def _load_env_file(path: Path) -> None:
    if not path.is_file():
        return
    for raw in path.read_text().splitlines():
        line = raw.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        k, v = line.split("=", 1)
        k, v = k.strip(), v.strip().strip('"').strip("'")
        os.environ.setdefault(k, v)


_load_env_file(Path("/opt/dispatcharr/.env"))
_load_env_file(Path("/etc/dispatcharr-jellyfin.env"))

import django  # noqa: E402

django.setup()

from django.db import transaction  # noqa: E402
from django.utils import timezone  # noqa: E402

from apps.m3u.models import M3UAccount  # noqa: E402
from apps.vod.models import (  # noqa: E402
    Episode,
    M3UEpisodeRelation,
    M3UMovieRelation,
    M3USeriesRelation,
    M3UVODCategoryRelation,
    Movie,
    Series,
    VODCategory,
    VODLogo,
)


class JellyfinSyncClient:
    def __init__(self, base_url: str, api_key: str, *, user_id: Optional[str] = None):
        self.base_url = base_url.rstrip("/")
        self.api_key = api_key
        self.user_id = user_id
        self._c = httpx.Client(timeout=120.0)

    def close(self) -> None:
        self._c.close()

    def _h(self) -> dict[str, str]:
        return {"X-Emby-Token": self.api_key}

    def resolve_user_id(self) -> str:
        if self.user_id:
            return self.user_id
        r = self._c.get(f"{self.base_url}/Users", headers=self._h())
        r.raise_for_status()
        users = r.json()
        for u in users:
            if u.get("Policy", {}).get("IsAdministrator") and u.get("Id"):
                return u["Id"]
        if users and users[0].get("Id"):
            return users[0]["Id"]
        raise RuntimeError("Sin usuario Jellyfin")

    def get_item(self, uid: str, item_id: str) -> dict[str, Any]:
        r = self._c.get(
            f"{self.base_url}/Users/{uid}/Items/{item_id}",
            headers=self._h(),
            params={
                "Fields": (
                    "Overview,Genres,ProductionYear,PremiereDate,RunTimeTicks,"
                    "CommunityRating,OfficialRating,ParentIndexNumber,IndexNumber,"
                    "SeasonId,SeriesId,Type,Name,ImageTags,MediaSources,Container,IsFolder"
                )
            },
        )
        r.raise_for_status()
        return r.json()

    def primary_image_url(self, item_id: str, image_tags: Optional[dict[str, str]]) -> Optional[str]:
        from urllib.parse import quote

        tags = image_tags or {}
        tag = tags.get("Primary")
        q = "maxHeight=600&quality=90"
        if tag:
            q += f"&tag={tag}"
        key_q = quote(self.api_key, safe="")
        return f"{self.base_url}/Items/{item_id}/Images/Primary?{q}&api_key={key_q}"

    def iter_movies(self, uid: str, *, page_size: int = 100):
        start = 0
        fields = (
            "Overview,Genres,ProductionYear,PremiereDate,RunTimeTicks,"
            "CommunityRating,OfficialRating,Container,ImageTags,Name"
        )
        while True:
            r = self._c.get(
                f"{self.base_url}/Users/{uid}/Items",
                headers=self._h(),
                params={
                    "Recursive": "true",
                    "IncludeItemTypes": "Movie",
                    "Limit": page_size,
                    "StartIndex": start,
                    "Fields": fields,
                },
            )
            r.raise_for_status()
            data = r.json()
            items = data.get("Items") or []
            yield from items
            total = data.get("TotalRecordCount") or 0
            start += len(items)
            if start >= total or not items:
                break

    def iter_series(self, uid: str, *, page_size: int = 50):
        start = 0
        fields = (
            "Overview,Genres,ProductionYear,PremiereDate,RunTimeTicks,"
            "CommunityRating,OfficialRating,ImageTags,Name,ChildCount"
        )
        while True:
            r = self._c.get(
                f"{self.base_url}/Users/{uid}/Items",
                headers=self._h(),
                params={
                    "Recursive": "true",
                    "IncludeItemTypes": "Series",
                    "Limit": page_size,
                    "StartIndex": start,
                    "Fields": fields,
                },
            )
            r.raise_for_status()
            data = r.json()
            items = data.get("Items") or []
            yield from items
            total = data.get("TotalRecordCount") or 0
            start += len(items)
            if start >= total or not items:
                break

    def iter_episodes(self, uid: str, series_id: str, *, page_size: int = 100):
        start = 0
        fields = (
            "Overview,PremiereDate,RunTimeTicks,CommunityRating,OfficialRating,"
            "Container,ImageTags,Name,ParentIndexNumber,IndexNumber,SeasonId,SeriesId,"
            "Type,IsFolder"
        )
        while True:
            r = self._c.get(
                f"{self.base_url}/Users/{uid}/Items",
                headers=self._h(),
                params={
                    "ParentId": series_id,
                    "IncludeItemTypes": "Episode",
                    "Recursive": "true",
                    "Limit": page_size,
                    "StartIndex": start,
                    "Fields": fields,
                },
            )
            r.raise_for_status()
            data = r.json()
            items = data.get("Items") or []
            yield from items
            total = data.get("TotalRecordCount") or 0
            start += len(items)
            if start >= total or not items:
                break


def ticks_to_secs(ticks: Any) -> Optional[int]:
    if ticks is None:
        return None
    try:
        return int(ticks) // 10_000_000
    except (TypeError, ValueError):
        return None


def genres_str(genres: Any) -> Optional[str]:
    if not genres:
        return None
    parts: list[str] = []
    if isinstance(genres, list):
        for g in genres:
            if isinstance(g, dict):
                n = g.get("Name") or g.get("Id")
                if n:
                    parts.append(str(n))
            else:
                parts.append(str(g))
    else:
        parts.append(str(genres))
    out = ", ".join(parts)
    return out[:255] if out else None


def rating_str(item: dict[str, Any]) -> Optional[str]:
    cr = item.get("CommunityRating")
    if cr is not None:
        try:
            return f"{float(cr):.1f}"[:10]
        except (TypeError, ValueError):
            pass
    off = item.get("OfficialRating")
    if off:
        return str(off)[:10]
    return None


def year_from_item(item: dict[str, Any]) -> Optional[int]:
    y = item.get("ProductionYear")
    if y is not None:
        try:
            return int(y)
        except (TypeError, ValueError):
            pass
    pd = item.get("PremiereDate")
    if pd and isinstance(pd, str) and len(pd) >= 4:
        try:
            return int(pd[:4])
        except ValueError:
            pass
    return None


def merge_cp(existing: Optional[dict], jellyfin_id: str) -> dict:
    base = dict(existing or {})
    base["jellyfin_id"] = jellyfin_id
    base["jellyfin_sync_at"] = timezone.now().isoformat()
    return base


def upsert_logo(url: Optional[str], *, short_id: str, dry_run: bool) -> Optional[VODLogo]:
    if not url:
        return None
    name = f"JF-{short_id}"[:255]
    if dry_run:
        print(f"  [dry-run] VODLogo name={name!r} url={url[:80]}...")
        return None
    logo, _ = VODLogo.objects.get_or_create(url=url, defaults={"name": name})
    if logo.name != name:
        logo.name = name
        logo.save(update_fields=["name"])
    return logo


def ensure_category_relation(acc: M3UAccount, cat: VODCategory, *, dry_run: bool) -> None:
    if dry_run:
        return
    rel, _ = M3UVODCategoryRelation.objects.get_or_create(m3u_account=acc, category=cat)
    if not rel.enabled:
        rel.enabled = True
        rel.save(update_fields=["enabled"])


def sync_movie(
    detail: dict[str, Any],
    *,
    acc: M3UAccount,
    cat: VODCategory,
    jf: JellyfinSyncClient,
    dry_run: bool,
) -> str:
    jid = detail["Id"]
    short = jid[:12]
    if not detail.get("Overview"):
        # lista incompleta
        uid = jf.resolve_user_id()
        detail = jf.get_item(uid, jid)

    logo_url = jf.primary_image_url(jid, detail.get("ImageTags"))
    logo = upsert_logo(logo_url, short_id=short, dry_run=dry_run)

    desc = (detail.get("Overview") or "").strip() or None
    year = year_from_item(detail)
    genre = genres_str(detail.get("Genres"))
    rating = rating_str(detail)
    duration_secs = ticks_to_secs(detail.get("RunTimeTicks"))
    container = (detail.get("Container") or "mp4").lower().lstrip(".")[:10]
    title = (detail.get("Name") or "Sin título").strip()[:255]

    movie = Movie.objects.filter(custom_properties__jellyfin_id=jid).first()
    if not movie:
        mq = Movie.objects.filter(name=title)
        if year is not None:
            movie = mq.filter(year=year).first()
        else:
            movie = mq.first()

    action = "skip"

    if dry_run:
        print(f"MOVIE {jid} {title!r} year={year} logo={'yes' if logo_url else 'no'}")
        return "dry"

    if movie:
        movie.name = title
        movie.description = desc
        movie.year = year
        movie.genre = genre
        movie.rating = rating
        movie.duration_secs = duration_secs
        movie.custom_properties = merge_cp(movie.custom_properties, jid)
        if logo:
            movie.logo = logo
        movie.save()
        action = "updated"
    else:
        movie = Movie.objects.create(
            name=title,
            description=desc,
            year=year,
            genre=genre,
            rating=rating,
            duration_secs=duration_secs,
            logo=logo,
            custom_properties=merge_cp(None, jid),
        )
        action = "created"

    M3UMovieRelation.objects.update_or_create(
        m3u_account=acc,
        stream_id=jid,
        defaults={
            "movie": movie,
            "category": cat,
            "container_extension": container,
            "custom_properties": {"source": "jellyfin_sync"},
            "last_seen": timezone.now(),
        },
    )
    return action


def jellyfin_item_is_episode_row(ed: dict[str, Any]) -> bool:
    """Descarta carpetas de temporada (Type Season / IsFolder) que Jellyfin puede mezclar en listados."""
    if ed.get("IsFolder"):
        return False
    return ed.get("Type") == "Episode"


def sync_series_tree(
    row: dict[str, Any],
    *,
    acc: M3UAccount,
    cat: VODCategory,
    jf: JellyfinSyncClient,
    uid: str,
    dry_run: bool,
) -> tuple[int, int]:
    """Devuelve (episodios_procesados, episodios_nuevos_o_actualizados)."""
    jid = row["Id"]
    detail = row if row.get("Overview") is not None else jf.get_item(uid, jid)
    logo_url = jf.primary_image_url(jid, detail.get("ImageTags"))
    logo = upsert_logo(logo_url, short_id=jid[:12], dry_run=dry_run)

    desc = (detail.get("Overview") or "").strip() or None
    year = year_from_item(detail)
    genre = genres_str(detail.get("Genres"))
    rating = rating_str(detail)
    title = (detail.get("Name") or "Sin título").strip()[:255]

    if dry_run:
        print(f"SERIES {jid} {title!r} episodes≈{detail.get('ChildCount')} logo={'yes' if logo_url else 'no'}")
        ep_count = 0
        for ep in jf.iter_episodes(uid, jid):
            eid = ep["Id"]
            tl = ep.get("Type")
            if tl not in (None, "Episode"):
                continue
            if tl is None or ep.get("Overview") is None:
                ed = jf.get_item(uid, eid)
            else:
                ed = ep
            if not jellyfin_item_is_episode_row(ed):
                continue
            ep_count += 1
            if ep_count <= 3:
                print(f"  ep {eid[:8]} S{ed.get('ParentIndexNumber')}E{ed.get('IndexNumber')} {ed.get('Name')!r}")
        return ep_count, ep_count

    series_obj = Series.objects.filter(custom_properties__jellyfin_id=jid).first()
    if not series_obj:
        sq = Series.objects.filter(name=title)
        if year is not None:
            series_obj = sq.filter(year=year).first()
        else:
            series_obj = sq.first()

    if series_obj:
        series_obj.name = title
        series_obj.description = desc
        series_obj.year = year
        series_obj.genre = genre
        series_obj.rating = rating
        series_obj.custom_properties = merge_cp(series_obj.custom_properties, jid)
        if logo:
            series_obj.logo = logo
        series_obj.save()
    else:
        series_obj = Series.objects.create(
            name=title,
            description=desc,
            year=year,
            genre=genre,
            rating=rating,
            logo=logo,
            custom_properties=merge_cp(None, jid),
        )

    sr, _ = M3USeriesRelation.objects.update_or_create(
        m3u_account=acc,
        external_series_id=jid,
        defaults={
            "series": series_obj,
            "category": cat,
            "last_seen": timezone.now(),
        },
    )

    processed = 0
    touched = 0
    synced_stream_ids: set[str] = set()
    for ep in jf.iter_episodes(uid, jid):
        eid = ep["Id"]
        tl = ep.get("Type")
        if tl not in (None, "Episode"):
            continue
        # Detalle si falta Type en lista o Overview (Season suele venir sin overview de episodio).
        if tl is None or ep.get("Overview") is None:
            ed = jf.get_item(uid, eid)
        else:
            ed = ep
        if not jellyfin_item_is_episode_row(ed):
            continue

        synced_stream_ids.add(eid)
        processed += 1
        season = ed.get("ParentIndexNumber")
        epnum = ed.get("IndexNumber")
        if season is None:
            season = 0
        if epnum is None:
            epnum = 0
        name = (ed.get("Name") or f"E{eid[:6]}").strip()[:255]
        ep_desc = (ed.get("Overview") or "").strip() or None
        dur = ticks_to_secs(ed.get("RunTimeTicks"))
        rating_ep = rating_str(ed)
        air_raw = ed.get("PremiereDate")
        air_date = None
        if air_raw and isinstance(air_raw, str) and len(air_raw) >= 10:
            air_date = air_raw[:10]

        container = (ed.get("Container") or "mp4").lower().lstrip(".")[:10]

        episode_obj, ep_created = Episode.objects.update_or_create(
            series=series_obj,
            season_number=season,
            episode_number=epnum,
            defaults={
                "name": name,
                "description": ep_desc,
                "duration_secs": dur,
                "rating": rating_ep,
                "air_date": air_date,
                "custom_properties": merge_cp(None, eid),
            },
        )

        _, rel_created = M3UEpisodeRelation.objects.update_or_create(
            m3u_account=acc,
            stream_id=eid,
            defaults={
                "episode": episode_obj,
                "series_relation": sr,
                "container_extension": container,
                "custom_properties": {"source": "jellyfin_sync"},
                "last_seen": timezone.now(),
            },
        )
        if ep_created or rel_created:
            touched += 1

    # Quitar relaciones que ya no son episodios reales en Jellyfin (p. ej. nodos Season sincronizados antes).
    existing_stream_ids = set(
        M3UEpisodeRelation.objects.filter(m3u_account=acc, series_relation=sr).values_list("stream_id", flat=True)
    )
    for sid in existing_stream_ids - synced_stream_ids:
        try:
            meta = jf.get_item(uid, sid)
        except httpx.HTTPStatusError as ex:
            if ex.response.status_code != 404:
                raise
            meta = None
        delete_fake = meta is None or meta.get("Type") != "Episode" or meta.get("IsFolder")
        if not delete_fake:
            continue
        for rel in M3UEpisodeRelation.objects.filter(m3u_account=acc, series_relation=sr, stream_id=sid):
            ep_row = rel.episode
            rel.delete()
            if not ep_row.m3u_relations.exists():
                ep_row.delete()

    # Evita que xc_get_series_info llame a refresh_series_episodes (API Xtream): borraría
    # las relaciones Jellyfin como «stale». Ver apps/output/views.py xc_get_series_info.
    cp_sr = dict(sr.custom_properties or {})
    cp_sr["source"] = "jellyfin_sync"
    cp_sr["episodes_fetched"] = True
    cp_sr["detailed_fetched"] = True
    sr.custom_properties = cp_sr
    sr.last_episode_refresh = timezone.now()
    sr.save(update_fields=["custom_properties", "last_episode_refresh"])

    return processed, touched


def main() -> int:
    p = argparse.ArgumentParser(description="Sync Jellyfin → Dispatcharr VOD (ORM)")
    p.add_argument("--dry-run", action="store_true")
    p.add_argument("--movies-only", action="store_true")
    p.add_argument("--series-only", action="store_true")
    p.add_argument("--m3u-account", default=os.environ.get("JELLYFIN_SYNC_M3U_ACCOUNT", "Biblioteca Jellyfin (sandbox)"))
    p.add_argument("--movie-category", default=os.environ.get("JELLYFIN_SYNC_MOVIE_CAT", "Biblioteca propia (sandbox)"))
    p.add_argument("--series-category", default=os.environ.get("JELLYFIN_SYNC_SERIES_CAT", "Biblioteca propia series (sandbox)"))
    p.add_argument("--max-movies", type=int, default=0, help="0 = sin límite")
    p.add_argument("--max-series", type=int, default=0, help="0 = sin límite")
    args = p.parse_args()

    acc = M3UAccount.objects.filter(name=args.m3u_account).first()
    if not acc:
        print(
            f"No existe cuenta M3U {args.m3u_account!r}; sincronización omitida "
            f"(crea la cuenta o define JELLYFIN_SYNC_M3U_ACCOUNT / --m3u-account).",
            file=sys.stderr,
        )
        return 0

    base = os.environ.get("JELLYFIN_SYNC_URL") or os.environ.get("JELLYFIN_BASE_URL")
    if not base and acc.server_url:
        base = str(acc.server_url).rstrip("/")
    key = os.environ.get("JELLYFIN_SYNC_API_KEY") or os.environ.get("DISPATCHARR_JELLYFIN_API_KEY") or os.environ.get(
        "JELLYFIN_API_KEY"
    )
    if not base or not key:
        print("Falta URL Jellyfin (JELLYFIN_SYNC_URL / server_url de la cuenta M3U) y/o API key.", file=sys.stderr)
        print("Clave: JELLYFIN_SYNC_API_KEY, DISPATCHARR_JELLYFIN_API_KEY (p. ej. /etc/dispatcharr-jellyfin.env).", file=sys.stderr)
        return 1

    cat_movie, _ = VODCategory.objects.get_or_create(
        name=args.movie_category,
        defaults={"category_type": "movie"},
    )
    cat_series, _ = VODCategory.objects.get_or_create(
        name=args.series_category,
        defaults={"category_type": "series"},
    )

    jf = JellyfinSyncClient(base, key)
    uid = jf.resolve_user_id()
    print(f"Jellyfin user={uid[:8]}… cuenta_m3u={acc.name!r}")

    try:
        do_movies = not args.series_only
        do_series = not args.movies_only

        if do_movies:
            ensure_category_relation(acc, cat_movie, dry_run=args.dry_run)
            stats = {"movie_created": 0, "movie_updated": 0}
            n = 0
            for row in jf.iter_movies(uid):
                det = row if row.get("Overview") is not None else jf.get_item(uid, row["Id"])
                act = sync_movie(det, acc=acc, cat=cat_movie, jf=jf, dry_run=args.dry_run)
                if act == "created":
                    stats["movie_created"] += 1
                elif act == "updated":
                    stats["movie_updated"] += 1
                n += 1
                if args.max_movies and n >= args.max_movies:
                    break
            print("Películas:", stats)

        if do_series:
            ensure_category_relation(acc, cat_series, dry_run=args.dry_run)
            total_eps = 0
            total_touch = 0
            ns = 0
            for row in jf.iter_series(uid):
                with transaction.atomic():
                    pe, pt = sync_series_tree(row, acc=acc, cat=cat_series, jf=jf, uid=uid, dry_run=args.dry_run)
                total_eps += pe
                total_touch += pt
                ns += 1
                if args.max_series and ns >= args.max_series:
                    break
            print(f"Series episodios procesados={total_eps} relaciones tocadas≈{total_touch}")

    finally:
        jf.close()

    return 0


if __name__ == "__main__":
    raise SystemExit(main())