"""Favorites — ulubione performerki + studia + liczenie nowych scen.

Single-user (brak users), więc API zwraca/operuje na global zbiorze. Multi-user
można dodać dorzuceniem `user_id` query/header bez breaking change.

Endpointy (performers — `/favorites/...` zostawione żeby nie łamać starego mobile):
  GET    /favorites                         — lista ulubionych performerek
  POST   /favorites/{performer_id}          — dodaj (idempotent)
  DELETE /favorites/{performer_id}          — usuń
  POST   /favorites/{performer_id}/seen     — mark-as-seen (zeruje badge)

Endpointy (studios):
  GET    /favorites/studios                 — lista ulubionych studiów
  POST   /favorites/studios/{studio_id}     — dodaj
  DELETE /favorites/studios/{studio_id}     — usuń
  POST   /favorites/studios/{studio_id}/seen — mark-as-seen

"Nowa scena" = scena której Scene.created_at > favorite.last_seen_at:
  - dla performerki: ScenePerformer.performer_id = X
  - dla studio: Scene.studio_id = X
"""
from __future__ import annotations

import uuid
from datetime import UTC, datetime
from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException, status
from pydantic import BaseModel
from sqlalchemy import select
from sqlalchemy.orm import Session

from app.api.device import get_device_id
from app.auth import require_api_key
from app.db import get_session
from app.models.favorite_movie import FavoriteMovie
from app.models.favorite_performer import FavoritePerformer
from app.models.favorite_studio import FavoriteStudio
from app.models.movie import Movie
from app.models.performer import Performer
from app.models.playback_source import PlaybackSource
from app.models.scene import Scene, ScenePerformer, SceneTag
from app.models.studio import Studio

router = APIRouter(
    prefix="/favorites", tags=["favorites"], dependencies=[Depends(require_api_key)]
)

# Licznik "+N nowych" MUSI liczyć to samo, co user zobaczy po wejściu na listę scen
# performerki/studia — inaczej pokazuje +6 a lista ma 0 (report: „+6 a nic nowego").
# Rozjazdy które to powodowały: (1) licznik nie nakładał blacklist device (gay-filter/
# ukryte tagi) którą lista nakłada, (2) nie ograniczał do pierwszej strony listy
# (per_page=200, sort release_date desc) — nowa scena o starej dacie wydania wpadała
# poza top-200 albo w ogóle poza to co widać, (3) dla studiów nie odsiewał stub-scen.
# Poniższe replikuje filtry i okno listy (app/api/scenes.py list_scenes, domyślne paramy
# mobile: has_playback=true, include_stubs=false). Trzymane ręcznie w zgodzie z tamtym.
_FAVORITES_PAGE_CAP = 200  # == per_page w PerformerScenesScreen/StudioScenesScreen


def _visible_scene_clauses(session: Session, device_id: str, *, apply_stub: bool) -> list:
    """Klauzule WHERE = filtry widoczności listy scen: żywy playback_source +
    blacklisty device + (opcjonalnie) odsianie stub-scen. Aplikowane na zapytanie
    z Scene w FROM."""
    from sqlalchemy import exists

    clauses = [
        exists(
            select(1).where(
                PlaybackSource.scene_id == Scene.id,
                PlaybackSource.dead_at.is_(None),
            )
        )
    ]
    from app.api.scenes import _blacklists_empty

    if not _blacklists_empty(session, device_id):
        from app.models.blacklist import (
            BlacklistedPerformer,
            BlacklistedStudio,
            BlacklistedTag,
        )

        clauses.append(
            ~exists(
                select(1)
                .select_from(ScenePerformer)
                .join(
                    BlacklistedPerformer,
                    (BlacklistedPerformer.performer_id == ScenePerformer.performer_id)
                    & (BlacklistedPerformer.device_id == device_id),
                )
                .where(ScenePerformer.scene_id == Scene.id)
            )
        )
        clauses.append(
            ~Scene.studio_id.in_(
                select(BlacklistedStudio.studio_id).where(
                    BlacklistedStudio.device_id == device_id
                )
            )
        )
        clauses.append(
            ~exists(
                select(1)
                .select_from(SceneTag)
                .join(
                    BlacklistedTag,
                    (BlacklistedTag.tag_id == SceneTag.tag_id)
                    & (BlacklistedTag.device_id == device_id),
                )
                .where(SceneTag.scene_id == Scene.id)
            )
        )
    if apply_stub:
        # Stub = tube-only scena bez release_date AND bez canonical (TPDB/StashDB) AND
        # bez performera. Dla widoku performerki nigdy nie zachodzi (ma performera), więc
        # apply_stub=False tam; dla studiów tak. Lustro scenes.py:348-367.
        from app.models.scene import SceneExternalRef
        from app.models.source import Source, SourceKind

        canonical_exists = exists(
            select(1)
            .select_from(SceneExternalRef)
            .join(Source, Source.id == SceneExternalRef.source_id)
            .where(SceneExternalRef.scene_id == Scene.id)
            .where(Source.kind.in_([SourceKind.tpdb, SourceKind.stashdb]))
        )
        has_performer = exists(select(1).where(ScenePerformer.scene_id == Scene.id))
        clauses.append(
            Scene.release_date.is_not(None) | canonical_exists | has_performer
        )
    return clauses


class FavoriteOut(BaseModel):
    performer_id: uuid.UUID
    canonical_name: str
    slug: str | None
    scene_count: int
    new_count: int  # sceny od last_seen_at
    last_seen_at: datetime
    created_at: datetime


class FavoriteListOut(BaseModel):
    items: list[FavoriteOut]
    total: int
    new_total: int  # suma new_count po wszystkich — dla badge w toolbar


@router.get("", response_model=FavoriteListOut)
def list_favorites(
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> FavoriteListOut:
    rows = session.execute(
        select(FavoritePerformer, Performer)
        .join(Performer, Performer.id == FavoritePerformer.performer_id)
        .where(FavoritePerformer.device_id == device_id)
        .order_by(Performer.canonical_name)
    ).all()
    if not rows:
        return FavoriteListOut(items=[], total=0, new_total=0)

    perf_ids = [perf.id for _, perf in rows]
    last_seen_by_perf = {fav.performer_id: fav.last_seen_at for fav, _ in rows}

    # scene_count: czytamy zdenormalizowany Performer.scene_count (refresh w tle przez
    # _job_refresh_taxonomy_counts) — ta sama definicja co przed (sceny z żywym
    # playback). Wcześniej grouped count z EXISTS playback per-request. Migracja 0019.
    scene_counts: dict = {perf.id: perf.scene_count for _, perf in rows}

    # new_count per performer = sceny created_at > last_seen_at, ale liczone TYLKO wśród
    # tych, które user faktycznie zobaczy na liście: te same filtry (żywy playback +
    # blacklist) i to samo okno (top-_FAVORITES_PAGE_CAP pod release_date desc) co
    # PerformerScenes. apply_stub=False — widok performerki i tak ma performera (nie-stub).
    new_counts: dict = {}
    if perf_ids:
        from sqlalchemy import func

        clauses = _visible_scene_clauses(session, device_id, apply_stub=False)
        rn = func.row_number().over(
            partition_by=ScenePerformer.performer_id,
            order_by=(Scene.release_date.desc().nullslast(), Scene.created_at.desc()),
        ).label("rn")
        inner = (
            select(
                ScenePerformer.performer_id.label("gid"),
                Scene.created_at.label("created_at"),
                rn,
            )
            .join(Scene, Scene.id == ScenePerformer.scene_id)
            .where(ScenePerformer.performer_id.in_(perf_ids))
            .where(*clauses)
            .subquery()
        )
        for gid, created_at in session.execute(
            select(inner.c.gid, inner.c.created_at).where(inner.c.rn <= _FAVORITES_PAGE_CAP)
        ):
            ls = last_seen_by_perf.get(gid)
            if created_at is not None and ls is not None and created_at > ls:
                new_counts[gid] = new_counts.get(gid, 0) + 1

    items: list[FavoriteOut] = []
    new_total = 0
    for fav, perf in rows:
        nc = new_counts.get(perf.id, 0)
        new_total += nc
        items.append(
            FavoriteOut(
                performer_id=perf.id,
                canonical_name=perf.canonical_name,
                slug=perf.slug,
                scene_count=scene_counts.get(perf.id, 0),
                new_count=nc,
                last_seen_at=fav.last_seen_at,
                created_at=fav.created_at,
            )
        )
    return FavoriteListOut(items=items, total=len(items), new_total=new_total)


class FavoriteAddOut(BaseModel):
    performer_id: uuid.UUID
    created: bool


@router.post(
    "/{performer_id}",
    response_model=FavoriteAddOut,
    status_code=status.HTTP_200_OK,
)
def add_favorite(
    performer_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> FavoriteAddOut:
    perf = session.get(Performer, performer_id)
    if perf is None:
        raise HTTPException(status_code=404, detail="performer not found")
    existing = session.get(FavoritePerformer, (device_id, performer_id))
    if existing is not None:
        return FavoriteAddOut(performer_id=performer_id, created=False)
    session.add(FavoritePerformer(device_id=device_id, performer_id=performer_id))
    session.commit()
    return FavoriteAddOut(performer_id=performer_id, created=True)


@router.delete("/{performer_id}", status_code=status.HTTP_204_NO_CONTENT)
def remove_favorite(
    performer_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> None:
    fav = session.get(FavoritePerformer, (device_id, performer_id))
    if fav is None:
        # idempotent — brak ulubionego = nie ma nic do usunięcia, success
        return
    session.delete(fav)
    session.commit()


class SeenOut(BaseModel):
    performer_id: uuid.UUID
    last_seen_at: datetime


@router.post("/{performer_id}/seen", response_model=SeenOut)
def mark_seen(
    performer_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> SeenOut:
    fav = session.get(FavoritePerformer, (device_id, performer_id))
    if fav is None:
        raise HTTPException(status_code=404, detail="not in favorites")
    fav.last_seen_at = datetime.now(UTC)
    session.commit()
    return SeenOut(performer_id=performer_id, last_seen_at=fav.last_seen_at)


# ---------- Studios ----------

class FavoriteStudioOut(BaseModel):
    studio_id: uuid.UUID
    name: str
    slug: str
    network: str | None = None
    scene_count: int
    new_count: int
    last_seen_at: datetime
    created_at: datetime


class FavoriteStudioListOut(BaseModel):
    items: list[FavoriteStudioOut]
    total: int
    new_total: int


@router.get("/studios", response_model=FavoriteStudioListOut)
def list_favorite_studios(
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> FavoriteStudioListOut:
    rows = session.execute(
        select(FavoriteStudio, Studio)
        .join(Studio, Studio.id == FavoriteStudio.studio_id)
        .where(FavoriteStudio.device_id == device_id)
        .order_by(Studio.name)
    ).all()
    if not rows:
        return FavoriteStudioListOut(items=[], total=0, new_total=0)

    studio_ids = [st.id for _, st in rows]
    last_seen_by_studio = {fav.studio_id: fav.last_seen_at for fav, _ in rows}

    # scene_count: zdenormalizowany Studio.scene_count (refresh w tle, migracja 0019).
    scene_counts: dict = {st.id: st.scene_count for _, st in rows}

    # new_count per studio — jak dla performerów (patrz list_favorites): te same filtry
    # + okno co lista StudioScenes. apply_stub=True: studio-scena bez performera/release/
    # canonical to stub który lista odsiewa, więc licznik też musi.
    new_counts: dict = {}
    if studio_ids:
        from sqlalchemy import func

        clauses = _visible_scene_clauses(session, device_id, apply_stub=True)
        rn = func.row_number().over(
            partition_by=Scene.studio_id,
            order_by=(Scene.release_date.desc().nullslast(), Scene.created_at.desc()),
        ).label("rn")
        inner = (
            select(
                Scene.studio_id.label("gid"),
                Scene.created_at.label("created_at"),
                rn,
            )
            .where(Scene.studio_id.in_(studio_ids))
            .where(*clauses)
            .subquery()
        )
        for gid, created_at in session.execute(
            select(inner.c.gid, inner.c.created_at).where(inner.c.rn <= _FAVORITES_PAGE_CAP)
        ):
            ls = last_seen_by_studio.get(gid)
            if created_at is not None and ls is not None and created_at > ls:
                new_counts[gid] = new_counts.get(gid, 0) + 1

    items: list[FavoriteStudioOut] = []
    new_total = 0
    for fav, st in rows:
        nc = new_counts.get(st.id, 0)
        new_total += nc
        items.append(
            FavoriteStudioOut(
                studio_id=st.id,
                name=st.name,
                slug=st.slug,
                network=st.network,
                scene_count=scene_counts.get(st.id, 0),
                new_count=nc,
                last_seen_at=fav.last_seen_at,
                created_at=fav.created_at,
            )
        )
    return FavoriteStudioListOut(items=items, total=len(items), new_total=new_total)


class FavoriteStudioAddOut(BaseModel):
    studio_id: uuid.UUID
    created: bool


@router.post(
    "/studios/{studio_id}",
    response_model=FavoriteStudioAddOut,
    status_code=status.HTTP_200_OK,
)
def add_favorite_studio(
    studio_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> FavoriteStudioAddOut:
    st = session.get(Studio, studio_id)
    if st is None:
        raise HTTPException(status_code=404, detail="studio not found")
    existing = session.get(FavoriteStudio, (device_id, studio_id))
    if existing is not None:
        return FavoriteStudioAddOut(studio_id=studio_id, created=False)
    session.add(FavoriteStudio(device_id=device_id, studio_id=studio_id))
    session.commit()
    return FavoriteStudioAddOut(studio_id=studio_id, created=True)


@router.delete("/studios/{studio_id}", status_code=status.HTTP_204_NO_CONTENT)
def remove_favorite_studio(
    studio_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> None:
    fav = session.get(FavoriteStudio, (device_id, studio_id))
    if fav is None:
        return
    session.delete(fav)
    session.commit()


class SeenStudioOut(BaseModel):
    studio_id: uuid.UUID
    last_seen_at: datetime


@router.post("/studios/{studio_id}/seen", response_model=SeenStudioOut)
def mark_studio_seen(
    studio_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> SeenStudioOut:
    fav = session.get(FavoriteStudio, (device_id, studio_id))
    if fav is None:
        raise HTTPException(status_code=404, detail="not in favorites")
    fav.last_seen_at = datetime.now(UTC)
    session.commit()
    return SeenStudioOut(studio_id=studio_id, last_seen_at=fav.last_seen_at)


# ── Favorite movies ────────────────────────────────────────────────────────
# Movies nie mają child scenes per-favorite (jak performerki/studia), więc
# `last_seen_at` nie jest tu używany do NEW count — tylko jako tracking ostatniego
# wglądu przez usera. Mobile używa NEW badge w liście /movies przez OSOBNY
# globalny last_seen z AsyncStorage (client-side, brak backendowego state).


class FavoriteMovieOut(BaseModel):
    movie_id: uuid.UUID
    title: str
    slug: str | None
    poster_url: str | None
    release_year: int | None
    studio_name: str | None
    last_seen_at: datetime
    created_at: datetime


class FavoriteMovieListOut(BaseModel):
    items: list[FavoriteMovieOut]
    total: int


@router.get("/movies", response_model=FavoriteMovieListOut)
def list_favorite_movies(
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> FavoriteMovieListOut:
    rows = session.execute(
        select(FavoriteMovie, Movie, Studio)
        .join(Movie, Movie.id == FavoriteMovie.movie_id)
        .outerjoin(Studio, Studio.id == Movie.studio_id)
        .where(FavoriteMovie.device_id == device_id)
        .order_by(Movie.title)
    ).all()
    items = [
        FavoriteMovieOut(
            movie_id=movie.id,
            title=movie.title,
            slug=movie.slug,
            poster_url=movie.poster_url,
            release_year=movie.release_year,
            studio_name=studio.name if studio else None,
            last_seen_at=fav.last_seen_at,
            created_at=fav.created_at,
        )
        for fav, movie, studio in rows
    ]
    return FavoriteMovieListOut(items=items, total=len(items))


class FavoriteMovieAddOut(BaseModel):
    movie_id: uuid.UUID
    created: bool


@router.post(
    "/movies/{movie_id}",
    response_model=FavoriteMovieAddOut,
    status_code=status.HTTP_200_OK,
)
def add_favorite_movie(
    movie_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> FavoriteMovieAddOut:
    movie = session.get(Movie, movie_id)
    if movie is None:
        raise HTTPException(status_code=404, detail="movie not found")
    existing = session.get(FavoriteMovie, (device_id, movie_id))
    if existing is not None:
        return FavoriteMovieAddOut(movie_id=movie_id, created=False)
    session.add(FavoriteMovie(device_id=device_id, movie_id=movie_id))
    session.commit()
    return FavoriteMovieAddOut(movie_id=movie_id, created=True)


@router.delete("/movies/{movie_id}", status_code=status.HTTP_204_NO_CONTENT)
def remove_favorite_movie(
    movie_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> None:
    fav = session.get(FavoriteMovie, (device_id, movie_id))
    if fav is None:
        return
    session.delete(fav)
    session.commit()


class SeenMovieOut(BaseModel):
    movie_id: uuid.UUID
    last_seen_at: datetime


@router.post("/movies/{movie_id}/seen", response_model=SeenMovieOut)
def mark_movie_seen(
    movie_id: uuid.UUID,
    session: Annotated[Session, Depends(get_session)],
    device_id: Annotated[str, Depends(get_device_id)],
) -> SeenMovieOut:
    fav = session.get(FavoriteMovie, (device_id, movie_id))
    if fav is None:
        raise HTTPException(status_code=404, detail="not in favorites")
    fav.last_seen_at = datetime.now(UTC)
    session.commit()
    return SeenMovieOut(movie_id=movie_id, last_seen_at=fav.last_seen_at)