"""E5 S4: the Plex Discover rail-surface. GET /api/plex/discover returns the consolidated rail
payload (continue watching / recently added / genre tiles / because-you-watched) served from the DB,
and GET /api/plex/surprise returns a scope-bounded random sample. DB lane (`db` fixture) — skipped
without Postgres.
"""
from datetime import datetime, timedelta, timezone

from fastapi.testclient import TestClient

import app.state as state
from app.auth import current_user
from app.db import get_db
from app.main import app
from app.models import PlexItem, PlexLibrary, PlexShow, PlexState, User

NOW = datetime(2024, 6, 1, tzinfo=timezone.utc)


def _seed(db):
    """A movie + show library. m1 is a watched, TMDB-enriched anchor whose one recommendation is m2
    (in library by guid); m3 is a movie in-progress; sh1 is a show with an in-progress episode."""
    lib_m = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
    lib_s = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
    db.add_all([lib_m, lib_s])
    db.flush()

    m1 = PlexItem(
        rating_key="m1", library_id=lib_m.id, kind="movie", title="Anchor Movie",
        guid="tmdb:111", genres=["Drama"], year=2001,
        added_at=NOW - timedelta(days=1),
        tmdb_enriched_at=NOW - timedelta(days=1),
        recommendations=[
            {"tmdb_id": 555, "title": "Rec Movie", "poster_path": None, "media_type": "movie"}
        ],
    )
    m2 = PlexItem(
        rating_key="m2", library_id=lib_m.id, kind="movie", title="Rec Movie",
        guid="tmdb:555", genres=["Comedy"], year=2002,
        added_at=NOW - timedelta(days=2),
    )
    m3 = PlexItem(
        rating_key="m3", library_id=lib_m.id, kind="movie", title="Half-Watched Movie",
        guid="tmdb:333", genres=["Drama"], year=2003, duration_s=6000,
        added_at=NOW - timedelta(days=3),
    )
    sh1 = PlexShow(rating_key="sh1", library_id=lib_s.id, title="A Show", child_count=1,
                   added_at=NOW - timedelta(hours=1))  # newest → leads recently-added
    db.add_all([m1, m2, m3, sh1])
    db.flush()
    ep1 = PlexItem(
        rating_key="sh1e1", library_id=lib_s.id, kind="episode", title="Ep 1",
        show_id=sh1.id, season_number=1, episode_number=1,
    )
    ep2 = PlexItem(
        rating_key="sh1e2", library_id=lib_s.id, kind="episode", title="Ep 2",
        show_id=sh1.id, season_number=1, episode_number=2,
    )
    db.add_all([ep1, ep2])

    user = User(email="discover@example.com")
    db.add(user)
    db.flush()

    db.add_all([
        # m1 watched most recently → the because-you-watched anchor.
        PlexState(user_id=user.id, item_id=m1.id, status="watched", watched_at=NOW),
        # m3 in-progress → continue watching.
        PlexState(user_id=user.id, item_id=m3.id, status="new", position_seconds=1200,
                  progress_updated_at=NOW - timedelta(hours=1)),
        # sh1's ep1 in-progress → the show is in continue watching.
        PlexState(user_id=user.id, item_id=ep1.id, status="new", position_seconds=300,
                  progress_updated_at=NOW - timedelta(minutes=30)),
    ])
    db.commit()
    return user


def _get(db, user, monkeypatch, path):
    monkeypatch.setattr(state, "_configured_cache", True)
    app.dependency_overrides[get_db] = lambda: db
    app.dependency_overrides[current_user] = lambda: user
    try:
        client = TestClient(app)  # no context manager: skip lifespan
        return client.get(path)
    finally:
        app.dependency_overrides.clear()


def _ids(cards):
    return [c["id"] for c in cards]


def test_discover_shape_and_recently_added_order(db, monkeypatch):
    user = _seed(db)
    resp = _get(db, user, monkeypatch, "/api/plex/discover?scope=both")
    assert resp.status_code == 200, resp.text
    d = resp.json()
    assert set(d) >= {"continue_watching", "recently_added", "genres", "because_you_watched"}
    # Recently added is newest-first; the show (added 1d ago) leads, then m1, m2, m3.
    assert _ids(d["recently_added"])[:4] == ["sh1", "m1", "m2", "m3"]
    # Genre tiles carry counts; Drama (m1 + m3) outweighs Comedy (m2).
    genres = {g["value"]: g["count"] for g in d["genres"]}
    assert genres.get("Drama") == 2 and genres.get("Comedy") == 1


def test_continue_watching_movies_and_shows(db, monkeypatch):
    user = _seed(db)
    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both").json()
    ids = _ids(d["continue_watching"])
    # The in-progress movie and the show with an in-progress episode are both present; the watched
    # anchor movie (m1) is not. Order is most-recently-progressed first (the show's ep beats m3).
    assert ids == ["sh1", "m3"]
    assert "m1" not in ids


def test_continue_watching_null_status_in_hidden_out(db, monkeypatch):
    # A started movie whose PlexState.status is NULL is still "in progress": `NULL NOT IN (...)` is NULL
    # (not TRUE), so a bare notin_ would wrongly drop it — the or_(is_(None), notin_) branch keeps it.
    # A hidden started movie must be excluded.
    lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
    db.add(lib)
    db.flush()
    m_null = PlexItem(rating_key="mn", library_id=lib.id, kind="movie", title="Null Status", guid="tmdb:1")
    m_hidden = PlexItem(rating_key="mh", library_id=lib.id, kind="movie", title="Hidden", guid="tmdb:2")
    db.add_all([m_null, m_hidden])
    db.flush()
    user = User(email="cw-null@example.com")
    db.add(user)
    db.flush()
    db.add_all([
        PlexState(user_id=user.id, item_id=m_null.id, status=None, position_seconds=500,
                  progress_updated_at=NOW),
        PlexState(user_id=user.id, item_id=m_hidden.id, status="hidden", position_seconds=500,
                  progress_updated_at=NOW - timedelta(hours=1)),
    ])
    db.commit()

    ids = _ids(_get(db, user, monkeypatch, "/api/plex/discover?scope=movie").json()["continue_watching"])
    assert "mn" in ids  # NULL-status started movie IS in progress
    assert "mh" not in ids  # hidden is excluded


def test_continue_watching_excludes_fully_watched_show(db, monkeypatch):
    # A show whose every episode is watched is DONE, not in-progress: the `watched < total` guard must
    # keep it off the Continue-watching rail (a bare `watched > 0` would wrongly resurface it).
    lib_s = PlexLibrary(plex_key="2", title="Shows", kind="show", enabled=True)
    db.add(lib_s)
    db.flush()
    sh = PlexShow(rating_key="shw", library_id=lib_s.id, title="All Watched", child_count=1)
    db.add(sh)
    db.flush()
    ep = PlexItem(rating_key="shwe1", library_id=lib_s.id, kind="episode", title="E1",
                  show_id=sh.id, season_number=1, episode_number=1)
    db.add(ep)
    db.flush()
    user = User(email="fullywatched@example.com")
    db.add(user)
    db.flush()
    db.add(PlexState(user_id=user.id, item_id=ep.id, status="watched", position_seconds=0,
                     progress_updated_at=NOW))
    db.commit()

    ids = _ids(_get(db, user, monkeypatch, "/api/plex/discover?scope=show").json()["continue_watching"])
    assert "shw" not in ids  # fully watched → excluded from continue-watching


def test_because_you_watched_resolves_in_library_recs(db, monkeypatch):
    user = _seed(db)
    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both").json()
    bw = d["because_you_watched"]
    assert bw is not None
    assert bw["anchor"]["id"] == "m1" and bw["anchor"]["title"] == "Anchor Movie"
    # m1's single recommendation (tmdb:555) is m2 in our library → it becomes the one rail card.
    assert _ids(bw["items"]) == ["m2"]


def test_because_you_watched_null_without_history(db, monkeypatch):
    _seed(db)
    fresh = User(email="fresh-discover@example.com")
    db.add(fresh)
    db.commit()
    d = _get(db, fresh, monkeypatch, "/api/plex/discover?scope=both").json()
    # A user with no watched-and-enriched movie gets no recommendation rail.
    assert d["because_you_watched"] is None
    assert d["continue_watching"] == []


def test_surprise_scope_and_bound(db, monkeypatch):
    user = _seed(db)
    resp = _get(db, user, monkeypatch, "/api/plex/surprise?scope=movie&limit=2")
    assert resp.status_code == 200, resp.text
    items = resp.json()["items"]
    assert len(items) <= 2
    assert all(c["type"] == "movie" for c in items)  # scope=movie excludes shows


def test_discover_scope_movie_excludes_shows(db, monkeypatch):
    user = _seed(db)
    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=movie").json()
    assert all(c["type"] == "movie" for c in d["recently_added"])
    # The show drops out of continue watching under the movie scope.
    assert _ids(d["continue_watching"]) == ["m3"]


def test_filters_narrow_every_discover_rail(db, monkeypatch):
    # The sidebar filters constrain the Discover rails just like the Browse grid (ask 3). A genre=Drama
    # filter keeps only the Drama titles across every rail; the genre-less show and the Comedy rec drop.
    user = _seed(db)
    d = _get(db, user, monkeypatch, "/api/plex/discover?scope=both&genres=Drama").json()
    # Recently-added: m1 + m3 (Drama) survive; Comedy m2 and the genre-less show sh1 are filtered out.
    assert set(_ids(d["recently_added"])) == {"m1", "m3"}
    # Continue-watching: only the in-progress Drama movie remains (the show has no genres → excluded).
    assert _ids(d["continue_watching"]) == ["m3"]
    # Genre tiles reflect the filtered set — only Drama, count 2 (m1 + m3).
    assert {g["value"]: g["count"] for g in d["genres"]} == {"Drama": 2}
    # Because-you-watched: the anchor m1 is watched, but its only rec (m2) is Comedy → filtered → no rail.
    assert d["because_you_watched"] is None


def test_filters_narrow_surprise(db, monkeypatch):
    user = _seed(db)
    items = _get(
        db, user, monkeypatch, "/api/plex/surprise?scope=movie&genres=Comedy"
    ).json()["items"]
    # Only the one Comedy movie qualifies under the filter.
    assert _ids(items) == ["m2"]