import "./setup";

import assert from "node:assert/strict";
import test, { after, before, beforeEach } from "node:test";

import { installTmdbStub, SERIES_ID, MOVIE_ID } from "./fixtures/tmdb";
import { prisma } from "../src/lib/db";
import { importMovie, importSeries } from "../src/lib/catalog";
import {
  addToLibrary,
  getNextEpisode,
  getProgress,
  getWatchedEpisodeIds,
  markEpisodesWatched,
  markMovieWatched,
  markSeasonWatched,
  markUpTo,
  moveToTrash,
  restoreFromTrash,
  setStatus,
  startRewatch,
  undoWatches,
  unmarkEpisodes,
  updateEntryDetails,
  watchNextEpisode,
} from "../src/lib/library";

/**
 * Prüft das Kern-Tracking: Aufnehmen, Abhaken, Fortschritt, Rewatch.
 * Läuft gegen die Entwicklungsdatenbank mit eigenem Testkonto und
 * nachgebildeten TMDB-Daten.
 */

const stub = installTmdbStub();
const TEST_EMAIL = "test-library@flimmer.invalid";
const OTHER_EMAIL = "test-library-other@flimmer.invalid";

let userId: string;
let seriesTitleId: string;
let movieTitleId: string;

async function cleanup() {
  await prisma.user.deleteMany({ where: { email: { in: [TEST_EMAIL, OTHER_EMAIL] } } });
  await prisma.title.deleteMany({ where: { tmdbId: { gte: 999000, lt: 1000000 } } });
}

before(async () => {
  await cleanup();
  const user = await prisma.user.create({
    data: { email: TEST_EMAIL, name: "Testkonto", region: "DE" },
    select: { id: true },
  });
  userId = user.id;

  seriesTitleId = (await importSeries(SERIES_ID, { region: "DE" })).id;
  movieTitleId = (await importMovie(MOVIE_ID, "DE")).id;
});

beforeEach(async () => {
  // Jeder Test startet mit einer leeren Bibliothek, aber demselben Katalog.
  await prisma.watch.deleteMany({ where: { userId } });
  await prisma.libraryEntry.deleteMany({ where: { userId } });
});

after(async () => {
  await cleanup();
  stub.restore();
  await prisma.$disconnect();
});

/** Alle regulären Episoden der Testserie, in Reihenfolge. */
async function regularEpisodes() {
  return prisma.episode.findMany({
    where: { titleId: seriesTitleId, seasonNumber: { gt: 0 } },
    orderBy: [{ seasonNumber: "asc" }, { episodeNumber: "asc" }],
    select: { id: true, seasonNumber: true, episodeNumber: true, runtime: true },
  });
}

test("Titel aufnehmen ist wiederholbar und schlägt den Streamingdienst vor", async () => {
  const first = await addToLibrary(userId, seriesTitleId, "WATCHLIST");
  const second = await addToLibrary(userId, seriesTitleId, "WATCHING");

  assert.equal(first.id, second.id, "kein zweiter Eintrag für denselben Titel");
  assert.equal(first.status, "WATCHLIST");
  assert.equal(
    first.whereToWatch,
    "Netflix",
    "der erste Abo-Dienst der Region wird als Startwert übernommen",
  );
});

test("Papierkorb behält den Fortschritt", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();
  await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);

  await moveToTrash(userId, entry.id);
  const trashed = await prisma.libraryEntry.findUniqueOrThrow({ where: { id: entry.id } });
  assert.ok(trashed.deletedAt, "liegt im Papierkorb statt gelöscht zu sein");

  // Erneutes Aufnehmen belebt denselben Eintrag wieder.
  const revived = await addToLibrary(userId, seriesTitleId);
  assert.equal(revived.id, entry.id);
  assert.equal(revived.deletedAt, null);

  const progress = await getProgress(userId, entry.id);
  assert.equal(progress.watched, 1, "die Sichtung hat den Umweg überlebt");

  await moveToTrash(userId, entry.id);
  await restoreFromTrash(userId, entry.id);
  const restored = await prisma.libraryEntry.findUniqueOrThrow({ where: { id: entry.id } });
  assert.equal(restored.deletedAt, null);
});

test("Fortschritt zählt Specials nicht mit", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const progress = await getProgress(userId, entry.id);

  assert.equal(progress.total, 5, "5 reguläre Episoden, die Weihnachtsfolge zählt nicht");
  assert.equal(progress.watched, 0);
  assert.equal(progress.percent, 0);

  const special = await prisma.episode.findFirstOrThrow({
    where: { titleId: seriesTitleId, seasonNumber: 0 },
  });
  await markEpisodesWatched(userId, entry.id, [special.id]);

  const after = await getProgress(userId, entry.id);
  assert.equal(after.watched, 0, "ein Special bewegt den Fortschrittsbalken nicht");
  assert.ok(after.minutesWatched > 0, "die Schauzeit wird trotzdem gezählt");
});

test("nächste Episode folgt der Reihenfolge und überspringt Specials", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);

  const first = await getNextEpisode(userId, entry.id);
  assert.equal(first?.seasonNumber, 1);
  assert.equal(first?.episodeNumber, 1);

  await watchNextEpisode(userId, entry.id);
  const second = await getNextEpisode(userId, entry.id);
  assert.equal(second?.episodeNumber, 2);

  // Über die Staffelgrenze hinweg
  await markSeasonWatched(
    userId,
    entry.id,
    (await prisma.season.findFirstOrThrow({ where: { titleId: seriesTitleId, seasonNumber: 1 } }))
      .id,
  );
  const third = await getNextEpisode(userId, entry.id);
  assert.equal(third?.seasonNumber, 2, "nach Staffel 1 kommt Staffel 2");
  assert.equal(third?.episodeNumber, 1);
});

test("Status ergibt sich aus den Sichtungen", async () => {
  const entry = await addToLibrary(userId, seriesTitleId, "WATCHLIST");
  const episodes = await regularEpisodes();

  const afterFirst = await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);
  assert.equal(afterFirst.status, "WATCHING", "die erste Episode startet die Serie");

  const afterAll = await markEpisodesWatched(
    userId,
    entry.id,
    episodes.map((episode) => episode.id),
  );
  assert.equal(afterAll.status, "COMPLETED", "die letzte Episode schließt sie ab");

  const completed = await prisma.libraryEntry.findUniqueOrThrow({ where: { id: entry.id } });
  assert.ok(completed.startedAt && completed.finishedAt);

  await unmarkEpisodes(userId, entry.id, [episodes[0]!.id]);
  const reopened = await prisma.libraryEntry.findUniqueOrThrow({ where: { id: entry.id } });
  assert.equal(reopened.status, "WATCHING", "eine zurückgenommene Episode öffnet sie wieder");
  assert.equal(reopened.finishedAt, null);
});

test("Pausiert und Abgebrochen bleiben stehen", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();

  await setStatus(userId, entry.id, "PAUSED");
  const result = await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);
  assert.equal(result.status, "PAUSED", "eine Sichtung hebt die Pause nicht selbsttätig auf");

  await setStatus(userId, entry.id, "DROPPED");
  const dropped = await markEpisodesWatched(userId, entry.id, [episodes[1]!.id]);
  assert.equal(dropped.status, "DROPPED");
});

test("„bis hierhin gesehen\" hakt alles davor ab", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();

  // Staffel 2, Episode 1 → alles aus Staffel 1 plus diese eine
  const target = episodes.find((e) => e.seasonNumber === 2 && e.episodeNumber === 1)!;
  const result = await markUpTo(userId, entry.id, target.id);

  assert.equal(result.watchIds.length, 4, "3 aus Staffel 1 und die Zielepisode");
  const progress = await getProgress(userId, entry.id);
  assert.equal(progress.watched, 4);
  assert.equal(progress.percent, 80);
});

test("doppeltes Abhaken legt keine zweite Sichtung an", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();

  await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);
  const again = await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);

  assert.equal(again.watchIds.length, 0);
  const count = await prisma.watch.count({ where: { userId, episodeId: episodes[0]!.id } });
  assert.equal(count, 1);
});

test("Rückgängig entfernt genau die eben angelegten Sichtungen", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();

  await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);
  const season = await markSeasonWatched(
    userId,
    entry.id,
    (await prisma.season.findFirstOrThrow({ where: { titleId: seriesTitleId, seasonNumber: 1 } }))
      .id,
  );

  assert.equal(season.watchIds.length, 2, "die bereits gesehene Episode ist nicht dabei");

  await undoWatches(userId, entry.id, season.watchIds);
  const progress = await getProgress(userId, entry.id);
  assert.equal(progress.watched, 1, "die erste Episode bleibt gesehen");
});

test("Rewatch setzt den Fortschritt zurück, behält aber die Schauzeit", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();
  await markEpisodesWatched(
    userId,
    entry.id,
    episodes.map((episode) => episode.id),
  );

  const firstRun = await getProgress(userId, entry.id);
  assert.equal(firstRun.percent, 100);

  await startRewatch(userId, entry.id);
  const secondRun = await getProgress(userId, entry.id);
  assert.equal(secondRun.watched, 0, "der neue Durchlauf beginnt bei null");
  assert.equal(secondRun.minutesWatched, 0);

  const total = await prisma.watch.aggregate({ where: { userId }, _sum: { minutes: true } });
  assert.equal(
    total._sum.minutes,
    firstRun.minutesWatched,
    "die Sichtungen des ersten Durchlaufs bleiben für die Statistik erhalten",
  );

  // Dieselbe Episode lässt sich im neuen Durchlauf erneut abhaken.
  const result = await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);
  assert.equal(result.watchIds.length, 1);
  const watched = await getWatchedEpisodeIds(userId, entry.id);
  assert.deepEqual([...watched], [episodes[0]!.id], "die Häkchen zeigen nur den aktuellen Durchlauf");
});

test("verbleibende Laufzeit schrumpft mit dem Fortschritt", async () => {
  const entry = await addToLibrary(userId, seriesTitleId);
  const episodes = await regularEpisodes();

  const before = await getProgress(userId, entry.id);
  const sum = episodes.reduce((total, episode) => total + (episode.runtime ?? 0), 0);
  assert.equal(before.minutesLeft, sum);

  await markEpisodesWatched(userId, entry.id, [episodes[0]!.id]);
  const after = await getProgress(userId, entry.id);
  assert.equal(after.minutesLeft, sum - (episodes[0]!.runtime ?? 0));
  assert.equal(after.minutesWatched, episodes[0]!.runtime);
});

test("Filme: gesehen, Rewatch und Laufzeit", async () => {
  const entry = await addToLibrary(userId, movieTitleId, "WATCHLIST");

  const result = await markMovieWatched(userId, entry.id);
  assert.equal(result.status, "COMPLETED");
  assert.equal(result.watchIds.length, 1);

  const progress = await getProgress(userId, entry.id);
  assert.equal(progress.percent, 100);
  assert.equal(progress.minutesWatched, 118);
  assert.equal(progress.minutesLeft, 0);

  const again = await markMovieWatched(userId, entry.id);
  assert.equal(again.watchIds.length, 0, "zweimal im selben Durchlauf zählt nicht doppelt");

  await startRewatch(userId, entry.id);
  await markMovieWatched(userId, entry.id);
  const runs = await prisma.watch.count({ where: { userId, entryId: entry.id } });
  assert.equal(runs, 2, "der zweite Durchlauf wird eigenständig gezählt");
});

test("Bewertung, Notiz und Fundort lassen sich pflegen", async () => {
  const entry = await addToLibrary(userId, movieTitleId);

  const updated = await updateEntryDetails(userId, entry.id, {
    rating: 9,
    notes: "  Zweimal gesehen, beim zweiten Mal besser.  ",
    whereToWatch: "Blu-ray",
    favorite: true,
  });

  assert.equal(updated.rating, 9);
  assert.equal(updated.notes, "Zweimal gesehen, beim zweiten Mal besser.", "Rand wird beschnitten");
  assert.equal(updated.whereToWatch, "Blu-ray");
  assert.equal(updated.favorite, true);

  await assert.rejects(
    () => updateEntryDetails(userId, entry.id, { rating: 11 }),
    /zwischen 1 und 10/,
  );
});

test("fremde Einträge sind nicht erreichbar", async () => {
  const other = await prisma.user.create({
    data: { email: OTHER_EMAIL, name: "Andere" },
    select: { id: true },
  });
  const entry = await addToLibrary(userId, movieTitleId);

  await assert.rejects(
    () => updateEntryDetails(other.id, entry.id, { rating: 1 }),
    /gehört nicht zu deiner Bibliothek/,
  );

  await prisma.user.delete({ where: { id: other.id } });
});