"""E5 S6: HU-overlay language serving. When ?lang=hu, the unified library, facets, genre filter and
detail endpoints serve the Hungarian `*_hu` columns (falling back to EN where a row has no HU twin);
?lang=en (the default) serves English. Also covers the imdb_rating IMDb-only / audience-score split.
DB lane (`db` fixture) — skipped without Postgres.
"""

from datetime import datetime, 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 import sysconfig
from app.plex.cards import display_summary, display_title
from app.models import (
    PlexCollection,
    PlexItem,
    PlexLibrary,
    PlexPlaylist,
    PlexPlaylistItem,
    PlexSeason,
    PlexShow,
    PlexState,
    User,
)


def _seed(db):
    """One EN movie library with a single movie that has both EN and HU metadata, plus a second movie
    that is EN-only (no HU twin) to prove the coalesce fallback."""
    lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
    db.add(lib)
    db.flush()
    m1 = PlexItem(
        rating_key="m1",
        library_id=lib.id,
        kind="movie",
        title="English Title",
        title_hu="Magyar Cím",
        summary="English summary.",
        summary_hu="Magyar összefoglaló.",
        genres=["Drama"],
        genres_hu=["Dráma", "Akció"],
        tagline="English tagline.",
        tagline_hu="Magyar mottó.",
        rating=6.5,
        imdb_rating=None,
        year=2001,
        added_at=datetime(2024, 1, 1, tzinfo=timezone.utc),
        people_enriched_at=datetime(
            2024, 1, 1, tzinfo=timezone.utc
        ),  # serve from row, skip live enrich
    )
    m2 = PlexItem(
        rating_key="m2",
        library_id=lib.id,
        kind="movie",
        title="EN Only",
        summary="English only.",
        tagline="English only tagline.",
        genres=["Comedy"],  # no HU twin, never reached by a sync since: no genres_hu
        year=2002,
        added_at=datetime(2024, 1, 2, tzinfo=timezone.utc),
        people_enriched_at=datetime(2024, 1, 2, tzinfo=timezone.utc),
    )
    db.add_all([m1, m2])
    user = User(email="plexlang@example.com")
    db.add(user)
    db.commit()
    return user


def _get(db, user, monkeypatch, override_dep, path):
    monkeypatch.setattr(
        state, "_configured_cache", True
    )  # the request gate 503s an unconfigured app
    override_dep(get_db, db.info["request"])
    override_dep(current_user, lambda: user)
    client = TestClient(app)  # no context manager: skip lifespan
    return client.get(path)


def _titles(resp):
    return {i["title"] for i in resp.json()["items"]}


def test_library_serves_active_language_titles(db, monkeypatch, override_dep):
    user = _seed(db)
    hu = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu")
    en = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=en")
    # HU serves the twin's Hungarian title; the EN-only row falls back to its English title.
    assert _titles(hu) == {"Magyar Cím", "EN Only"}
    assert _titles(en) == {"English Title", "EN Only"}


def test_facets_vocabulary_is_language_specific(db, monkeypatch, override_dep):
    user = _seed(db)
    hu = _get(db, user, monkeypatch, override_dep, "/api/plex/facets?scope=movie&lang=hu")
    en = _get(db, user, monkeypatch, override_dep, "/api/plex/facets?scope=movie&lang=en")
    hu_genres = {g["value"] for g in hu.json()["genres"]}
    en_genres = {g["value"] for g in en.json()["genres"]}
    assert "Dráma" in hu_genres and "Drama" not in hu_genres
    assert "Drama" in en_genres and "Dráma" not in en_genres


def test_genre_filter_matches_active_language_vocabulary(db, monkeypatch, override_dep):
    user = _seed(db)
    # The HU genre chip filters the HU column; the same string against the EN column matches nothing.
    hit = _get(
        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu&genres=Dráma"
    )
    miss = _get(
        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=en&genres=Dráma"
    )
    assert _titles(hit) == {"Magyar Cím"}
    assert miss.json()["items"] == []


def test_a_genre_filter_saved_in_english_still_matches_in_hungarian(db, monkeypatch, override_dep):
    """E30: the HU column holds one Hungarian word per genre. A filter saved while the HU list still
    offered "Action" is read through the same map, so it finds the "Akció" title instead of nothing."""
    user = _seed(db)
    resp = _get(
        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu&genres=Action"
    )
    assert _titles(resp) == {"Magyar Cím"}


def test_a_genre_the_hungarian_list_offers_in_english_still_matches(db, monkeypatch, override_dep):
    """E30 review: a row the sync has not given Hungarian genres yet is listed under its English word
    (the facets read coalesce(genres_hu, genres)); filtering by that word must find it."""
    user = _seed(db)
    facets = _get(db, user, monkeypatch, override_dep, "/api/plex/facets?scope=movie&lang=hu")
    assert "Comedy" in {g["value"] for g in facets.json()["genres"]}
    resp = _get(
        db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu&genres=Comedy"
    )
    assert _titles(resp) == {"EN Only"}


def test_a_title_without_a_hungarian_twin_reads_in_english(db, monkeypatch, override_dep):
    user = _seed(db)
    body = _get(db, user, monkeypatch, override_dep, "/api/plex/item/m2?lang=hu").json()
    assert (body["title"], body["summary"], body["tagline"]) == (
        "EN Only",
        "English only.",
        "English only tagline.",
    )
    row = PlexItem(title="T", summary="S")
    assert (display_title(row, "hu"), display_summary(row, "hu")) == ("T", "S")
    row.title_hu, row.summary_hu = "HT", "HS"
    assert (display_title(row, "hu"), display_summary(row, "hu")) == ("HT", "HS")
    assert (display_title(row, "en"), display_summary(row, "en")) == ("T", "S")


def test_item_detail_language_and_rating_split(db, monkeypatch, override_dep):
    user = _seed(db)
    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/item/m1?lang=hu")
    body = resp.json()
    assert body["title"] == "Magyar Cím"
    assert body["summary"] == "Magyar összefoglaló."
    assert body["tagline"] == "Magyar mottó."  # E30: the HU overlay's tagline
    en = _get(db, user, monkeypatch, override_dep, "/api/plex/item/m1").json()
    assert en["tagline"] == "English tagline."
    # imdb_rating is IMDb-only (None here); the audience score is served separately as `rating`.
    assert body["imdb_rating"] is None
    assert body["rating"] == 6.5


def test_hu_search_still_finds_en_only_titles(db, monkeypatch, override_dep):
    user = _seed(db)
    # m2 ("EN Only") has no HU twin, so search_vector_hu carries no title tokens for it. HU-mode search
    # must still match it via the EN vector (vector_match's union) — findable by its English title.
    resp = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&lang=hu&q=Only")
    assert "EN Only" in _titles(resp)


def test_rating_filter_prefers_imdb_over_audience(db, monkeypatch, override_dep):
    lib = PlexLibrary(plex_key="1", title="Movies", kind="movie", enabled=True)
    db.add(lib)
    db.flush()
    # imdb 8.0 but audience 4.0 → a rating_min of 7 must MATCH (filter the displayed best score,
    # IMDb preferred), where filtering the raw audience column (4.0) would wrongly exclude it.
    db.add(
        PlexItem(
            rating_key="r1",
            library_id=lib.id,
            kind="movie",
            title="High IMDb",
            imdb_rating=8.0,
            rating=4.0,
            year=2001,
            added_at=datetime(2024, 1, 1, tzinfo=timezone.utc),
            people_enriched_at=datetime(2024, 1, 1, tzinfo=timezone.utc),
        )
    )
    user = User(email="rating@example.com")
    db.add(user)
    db.commit()
    hit = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&rating_min=7")
    assert "High IMDb" in _titles(hit)
    miss = _get(db, user, monkeypatch, override_dep, "/api/plex/library?scope=movie&rating_min=9")
    assert "High IMDb" not in _titles(miss)


def _seed_rails(db):
    """`_seed` plus what every card rail reads: a HU-overlaid show with a HU-overlaid episode in
    progress, a cast name, a collection, and a playlist holding the movie and the episode."""
    user = _seed(db)
    m1 = db.query(PlexItem).filter_by(rating_key="m1").one()
    m1.cast_names = ["Anna"]
    m1.collection_keys = ["c1"]
    db.add(PlexCollection(rating_key="c1", library_id=m1.library_id, title="Coll"))
    tv = PlexLibrary(plex_key="2", title="TV Shows", kind="show", enabled=True)
    db.add(tv)
    db.flush()
    show = PlexShow(
        rating_key="s1",
        library_id=tv.id,
        title="English Show",
        title_hu="Magyar Sorozat",
        added_at=datetime(2024, 1, 3, tzinfo=timezone.utc),
    )
    db.add(show)
    db.flush()
    season = PlexSeason(rating_key="s1s1", show_id=show.id, title="Season 1", season_number=1)
    db.add(season)
    db.flush()
    ep = PlexItem(
        rating_key="e1",
        library_id=tv.id,
        kind="episode",
        show_id=show.id,
        season_id=season.id,
        title="Pilot",
        title_hu="Kezdet",
        season_number=1,
        episode_number=1,
        duration_s=3000,
    )
    db.add(ep)
    db.flush()
    db.add(
        PlexState(
            user_id=user.id,
            item_id=ep.id,
            status="in_progress",
            position_seconds=600,
            progress_updated_at=datetime(2024, 2, 1, tzinfo=timezone.utc),
        )
    )
    pl = PlexPlaylist(user_id=user.id, title="Mix")
    db.add(pl)
    db.flush()
    db.add_all(
        [
            PlexPlaylistItem(playlist_id=pl.id, item_id=m1.id, position=0),
            PlexPlaylistItem(playlist_id=pl.id, item_id=ep.id, position=1),
        ]
    )
    # TMDB extras: m2 recommends m1 (held) and a title we lack; m1, watched, anchors the recs rail.
    m1.guid = "tmdb:1"
    m1.tmdb_enriched_at = datetime(2024, 1, 1, tzinfo=timezone.utc)
    m1.recommendations = [{"tmdb_id": 2, "title": "EN Only", "media_type": "movie"}]
    m2 = db.query(PlexItem).filter_by(rating_key="m2").one()
    m2.guid = "tmdb:2"
    m2.tmdb_enriched_at = datetime(2024, 1, 1, tzinfo=timezone.utc)
    m2.recommendations = [
        {"tmdb_id": 1, "title": "English Title", "media_type": "movie"},
        {"tmdb_id": 77, "title": "Elsewhere", "media_type": "movie"},
    ]
    db.add(
        PlexState(
            user_id=user.id,
            item_id=m1.id,
            status="watched",
            watched_at=datetime(2024, 3, 1, tzinfo=timezone.utc),
        )
    )
    sysconfig.set_value(db, "plex_enabled", True)
    db.commit()
    return user, pl.id


def test_every_card_rail_serves_the_readers_language(db, monkeypatch, override_dep):
    """E30: the grid spoke Hungarian, but every other card surface (Discover rails, show page,
    search, collection, person page, playlist, Home) served the English title to a HU reader."""
    user, pid = _seed_rails(db)

    def get(path):
        return _get(db, user, monkeypatch, override_dep, path).json()

    def titles(cards):
        return {c["title"] for c in cards}

    rails = get("/api/plex/discover?scope=both&lang=hu")
    assert {"Magyar Cím", "Magyar Sorozat"} <= titles(rails["recently_added"])
    assert "Magyar Sorozat" in titles(rails["continue_watching"])
    assert titles(get("/api/plex/show/s1?lang=hu")["seasons"][0]["episodes"]) == {"Kezdet"}
    found = get("/api/plex/library?scope=both&lang=hu&q=Kezdet")["episodes"]
    assert [(e["title"], e["show_title"]) for e in found] == [("Kezdet", "Magyar Sorozat")]
    assert titles(get("/api/plex/collections/c1?lang=hu")["items"]) == {"Magyar Cím"}
    assert titles(get("/api/plex/person/Anna?lang=hu")["movies"]) == {"Magyar Cím"}
    items = get(f"/api/plex/playlists/{pid}?lang=hu")["items"]
    assert [(c["title"], c.get("show_title")) for c in items] == [
        ("Magyar Cím", None),
        ("Kezdet", "Magyar Sorozat"),
    ]
    # A recommendation we hold is named as the library names it; the rail's anchor too.
    recs = get("/api/plex/item/m2?lang=hu")["tmdb"]["recommendations"]
    assert [(r["title"], r["in_library"]) for r in recs] == [
        ("Magyar Cím", True),
        ("Elsewhere", False),
    ]
    byw = get("/api/plex/discover?scope=both&lang=hu")["because_you_watched"]
    assert byw["anchor"]["title"] == "Magyar Cím"
    home = get("/api/discover?lang=hu")["continue_watching"]
    plex = [c for c in home if c["source"] == "plex"]
    assert [c["title"] for c in plex] == ["Magyar Sorozat"]
    assert plex[0]["next"]["title"] == "Kezdet"
    # EN (the default) still serves English on the same rails.
    items = get(f"/api/plex/playlists/{pid}")["items"]
    assert [(c["title"], c.get("show_title")) for c in items] == [
        ("English Title", None),
        ("Pilot", "English Show"),
    ]