"""Plex people: cast/crew filter-chip cards + a single person's filmography page."""

from fastapi import APIRouter, Depends
from sqlalchemy import func, or_, select
from sqlalchemy.orm import Session

from app.auth import current_user
from app.db import get_db
from app.models import (
    PlexItem,
    PlexPerson,
    PlexShow,
    PlexState,
    User,
)
from app.plex import rollup
from app.plex.cards import movie_card, show_card
from app.plex.query import split_csv
from app.routes.plex._shared import _content_libs

router = APIRouter(prefix="/api/plex", tags=["plex"])


@router.get("/people/cards")
def people_cards(
    names: str,
    scope: str = "both",
    user: User = Depends(current_user),
    db: Session = Depends(get_db),
) -> dict:
    """Cards for the actor filter-chips currently applied: each name + its cached headshot + how many
    movies/shows (in the given scope) feature them. Photos come from the plex_people cache (populated
    as items are rich-fetched — info-page view + the rich re-sync); counts are live against cast_names.
    A name with no cached photo yet still returns a card (the UI shows a placeholder)."""
    wanted = split_csv(names)[:16]
    if not wanted:
        return {"people": []}
    movie_lib_ids, show_lib_ids = _content_libs(db)
    want_movies = scope in ("movie", "both") and bool(movie_lib_ids)
    want_shows = scope in ("show", "both") and bool(show_lib_ids)
    photos = {
        p.name: p.photo_thumb
        for p in db.execute(
            select(PlexPerson).where(PlexPerson.name.in_(wanted))
        ).scalars()
    }
    out = []
    for nm in wanted:
        count = 0
        if want_movies:
            count += (
                db.scalar(
                    select(func.count(PlexItem.id)).where(
                        PlexItem.kind == "movie",
                        PlexItem.library_id.in_(movie_lib_ids),
                        PlexItem.cast_names.contains([nm]),
                    )
                )
                or 0
            )
        if want_shows:
            count += (
                db.scalar(
                    select(func.count(PlexShow.id)).where(
                        PlexShow.library_id.in_(show_lib_ids),
                        PlexShow.cast_names.contains([nm]),
                    )
                )
                or 0
            )
        out.append({"name": nm, "photo": photos.get(nm), "count": count})
    return {"people": out}


# Cap each filmography section — a prolific person shouldn't return an unbounded list the client then
# mounts a card per row for (the grid paginates at PAGE; this page renders all at once). Ample for a
# personal library; the most-recent titles win via the year-desc order.
_PERSON_SECTION_MAX = 200


@router.get("/person/{name}")
def person_detail(
    name: str,
    user: User = Depends(current_user),
    db: Session = Depends(get_db),
) -> dict:
    """One cast/crew member's filmography: their cached headshot + the movies and shows (in the enabled
    libraries) whose cast OR directors include this name — the inverse of the cast-name → library-filter
    link. The name string is the identity key (Plex cast carries no stable per-person id), so distinct
    people who share a name share a page. Each section is capped at _PERSON_SECTION_MAX. An unknown name
    simply returns empty sections."""
    photo = db.scalar(select(PlexPerson.photo_thumb).where(PlexPerson.name == name))
    movie_lib_ids, show_lib_ids = _content_libs(db)

    movies: list[dict] = []
    if movie_lib_ids:
        items = db.execute(
            select(PlexItem)
            .where(
                PlexItem.kind == "movie",
                PlexItem.library_id.in_(movie_lib_ids),
                or_(
                    PlexItem.cast_names.contains([name]),
                    PlexItem.directors.contains([name]),
                ),
            )
            .order_by(PlexItem.year.desc().nullslast(), func.lower(PlexItem.title))
            .limit(_PERSON_SECTION_MAX)
        ).scalars().all()
        item_ids = [it.id for it in items]
        states = {
            s.item_id: s
            for s in db.execute(
                select(PlexState).where(
                    PlexState.user_id == user.id,
                    PlexState.item_id.in_(item_ids or [0]),
                )
            ).scalars()
        }
        movies = [movie_card(it, states.get(it.id)) for it in items]

    shows: list[dict] = []
    if show_lib_ids:
        show_rows = db.execute(
            select(PlexShow)
            .where(
                PlexShow.library_id.in_(show_lib_ids),
                or_(
                    PlexShow.cast_names.contains([name]),
                    PlexShow.directors.contains([name]),
                ),
            )
            .order_by(PlexShow.year.desc().nullslast(), func.lower(PlexShow.title))
            .limit(_PERSON_SECTION_MAX)
        ).scalars().all()
        statuses = rollup.state_map(db, user.id, [s.id for s in show_rows])
        shows = [show_card(sh, statuses.get(sh.id, "new")) for sh in show_rows]

    return {"name": name, "photo": photo, "movies": movies, "shows": shows}