import { createMockTmdb, HEART_SIGNAL_FIXTURE, type MockTmdb, TMDB_FIXTURES } from "@umt/testkit";
import { afterEach, describe, expect, it } from "vitest";
import {
  createTmdbClient,
  fetchRichDetail,
  fetchRichSeason,
  isPlaceholderEpisodeName,
  overviewLanguages,
  parseAltTitles,
  parseTranslations,
  pickChineseTitle,
  pickText,
  pickTitle,
} from "./index.ts";

let mock: MockTmdb | null = null;
afterEach(async () => {
  await mock?.close();
  mock = null;
});

async function setup() {
  mock = await createMockTmdb({ fixtures: [...TMDB_FIXTURES, HEART_SIGNAL_FIXTURE] });
  const tmdb = createTmdbClient({ baseUrl: `${mock.url}/3`, apiKey: "test-tmdb-key", retries: 0, timeoutMs: 1000 });
  return { mock, tmdb };
}

const CHAIN = ["zh-CN", "zh-SG", "zh-TW", "zh-HK", "en-US"];

describe("语言回退链(纯函数)", () => {
  const translations = parseTranslations(
    {
      translations: [
        { iso_639_1: "zh", iso_3166_1: "CN", data: { name: "", overview: "简中简介" } },
        { iso_639_1: "zh", iso_3166_1: "TW", data: { name: "人生切割術", overview: "繁中簡介" } },
        { iso_639_1: "en", iso_3166_1: "US", data: { name: "", overview: "English" } },
      ],
    },
    "name",
  );
  const altTitles = parseAltTitles({
    results: [
      { iso_3166_1: "CN", title: "Severance CN", type: "" },
      { iso_3166_1: "CN", title: "人生切割术", type: "" },
      { iso_3166_1: "HK", title: "生活割離術", type: "" },
    ],
  });
  const src = { translations, altTitles, originalTitle: "Severance", originalLanguage: "en", primary: "Severance" };

  it("zh-CN 译名为空时取 CN 地区的中文别名(对照 MP __update_tmdbinfo_cn_title)", () => {
    expect(pickTitle(CHAIN, src)).toEqual({ value: "人生切割术", language: "zh-CN", via: "alternative_title" });
    expect(pickChineseTitle(CHAIN, src)?.value).toBe("人生切割术");
  });

  it("没有 CN 别名时按链落到 zh-TW 译名;链只有英文时英文原名", () => {
    const noCn = { ...src, altTitles: altTitles.filter((a) => a.region !== "CN") };
    expect(pickTitle(CHAIN, noCn)).toMatchObject({ value: "人生切割術", language: "zh-TW", via: "translation" });
    expect(pickTitle(["en-US"], noCn)).toMatchObject({ value: "Severance", language: "en-US", via: "original" });
    expect(pickTitle(["ja-JP"], { ...noCn, originalLanguage: "ko" })).toMatchObject({ via: "primary" });
  });

  it("简介按链取第一个非空值", () => {
    expect(pickText(CHAIN, translations, "overview")).toMatchObject({ value: "简中简介", language: "zh-CN" });
    expect(pickText(["zh-HK", "en-US"], translations, "overview")).toMatchObject({ value: "English" });
    expect(pickText(["ja-JP"], translations, "overview", { value: null, language: null })).toBeNull();
  });

  it("MD-2 简介链:缺省只到中文变体;排在中文前面的语言保留;链里没有中文或允许回退时原链", () => {
    expect(overviewLanguages(CHAIN)).toEqual(["zh-CN", "zh-SG", "zh-TW", "zh-HK"]);
    expect(overviewLanguages(CHAIN, true)).toEqual(CHAIN);
    expect(overviewLanguages(["en-US", "zh-CN", "ja-JP"])).toEqual(["en-US", "zh-CN"]);
    expect(overviewLanguages(["ja-JP", "en-US"])).toEqual(["ja-JP", "en-US"]);
    expect(overviewLanguages(["zh", "en-US"])).toEqual(["zh"]);
  });

  it("MD-2 简介只有英文:按中文链取不到就为空;标题仍回退到英文", () => {
    const enOnly = parseTranslations(
      {
        translations: [
          { iso_639_1: "zh", iso_3166_1: "CN", data: { name: "", overview: "" } },
          { iso_639_1: "en", iso_3166_1: "US", data: { name: "Heart Signal", overview: "English only" } },
        ],
      },
      "name",
    );
    expect(pickText(overviewLanguages(CHAIN), enOnly, "overview")).toBeNull();
    expect(pickText(CHAIN, enOnly, "overview")).toMatchObject({ value: "English only", language: "en-US" });
    // 请求语言下的原值其实是英文译文(TMDB 回退):不当作 zh-CN
    expect(
      pickText(overviewLanguages(CHAIN), enOnly, "overview", { value: "English only", language: "zh-CN" }),
    ).toBeNull();
    expect(pickTitle(CHAIN, { translations: enOnly, primary: null })).toMatchObject({
      value: "Heart Signal",
      language: "en-US",
    });
  });

  it("占位集名识别", () => {
    expect(isPlaceholderEpisodeName("第 3 集", 3)).toBe(true);
    expect(isPlaceholderEpisodeName("Episode 3", 3)).toBe(true);
    expect(isPlaceholderEpisodeName("第3話")).toBe(true);
    expect(isPlaceholderEpisodeName("第 3 集", 4)).toBe(false);
    expect(isPlaceholderEpisodeName("有关地狱的好消息", 1)).toBe(false);
    expect(isPlaceholderEpisodeName("")).toBe(true);
  });
});

describe("fetchRichDetail / fetchRichSeason(mock TMDB)", () => {
  it("Severance:标题取 CN 别名,中文名 zh-CN,简介 zh-CN,主创与外部 ID", async () => {
    const { tmdb, mock } = await setup();
    const d = await fetchRichDetail(tmdb, "tv", 95396, CHAIN);
    expect(d.title).toBe("人生切割术");
    expect(d.titleLanguage).toBe("zh-CN");
    expect(d.titleZh).toBe("人生切割术");
    expect(d.overview).toBe("故事发生在一家名为卢蒙的超级大公司内。");
    expect(d.overviewLanguage).toBe("zh-CN");
    expect(d.genres).toEqual(["剧情", "悬疑", "Sci-Fi & Fantasy"]);
    expect(d.voteAverage).toBe(8.4);
    expect(d.status).toBe("Returning Series");
    expect(d.networks).toEqual(["Apple TV"]);
    expect(d.cast[0]).toEqual({
      id: 4495,
      name: "亚当·斯科特",
      originalName: null,
      role: "Mark Scout",
      profilePath: "/adam.jpg",
    });
    expect(d.crew[0]).toMatchObject({ name: "丹·埃里克森", role: "Creator" });
    expect(d.externalIds).toEqual({ imdb: "tt11280740", tvdb: "371980", wikidata: null });
    expect(d.seasons.map((s) => s.seasonNumber)).toEqual([1, 2]);
    // 一次请求(credits 等随 append_to_response)
    expect(mock.calls.filter((r) => r.path === "/3/tv/95396")).toHaveLength(1);
  });

  it("链首 en-US:英文原名、英文简介,中文名仍按中文链取", async () => {
    const { tmdb } = await setup();
    const d = await fetchRichDetail(tmdb, "tv", 95396, ["en-US"]);
    expect(d.title).toBe("Severance");
    expect(d.overview).toBe("Mark leads a team of office workers.");
    expect(d.titleZh).toBe("人生切割术");
  });

  it("季集:首选语言缺标题 / 简介的已播集按链补拉;未播出的集不触发补拉", async () => {
    const { tmdb, mock } = await setup();
    const s = await fetchRichSeason(tmdb, 95396, 1, CHAIN, { now: new Date("2026-01-01") });
    expect(s.name).toBe("第 1 季");
    expect(s.overview).toContain("卢蒙");
    const [e1, e2, e3] = s.episodes;
    expect(e1).toMatchObject({
      name: "有关地狱的好消息",
      nameLanguage: "zh-CN",
      overview: "马克升职成为部门主管。",
      runtime: 59,
      stillPath: "/sev-101.jpg",
      voteAverage: 8.2,
      voteCount: 171,
    });
    expect(e2).toMatchObject({ name: "半循環", nameLanguage: "zh-TW", overview: "馬克帶領新員工參觀。" });
    // 链走完仍没有中文名:en-US 标题;简介各语言都空
    expect(e3).toMatchObject({ name: "In Perpetuity", nameLanguage: "en-US", overview: null });
    expect(s.fetchedLanguages).toEqual(CHAIN);
    const perLang = mock.calls.filter((r) => r.path === "/3/tv/95396/season/1").map((r) => r.query.language);
    expect(perLang).toEqual(CHAIN);

    mock.calls.length = 0;
    const s2 = await fetchRichSeason(tmdb, 95396, 2, CHAIN, { now: new Date("2026-01-01") });
    expect(s2.episodes[0]).toMatchObject({ name: "第 1 集", nameLanguage: null });
    expect(s2.fetchedLanguages).toEqual(["zh-CN"]);
  });

  it("MD-2《心动的信号》:作品与每集简介只有英文 → 留空;标题照常回退;允许非中文时恢复英文", async () => {
    const { tmdb, mock } = await setup();
    const d = await fetchRichDetail(tmdb, "tv", 103147, CHAIN);
    expect(d.title).toBe("心动的信号");
    expect(d.overview).toBeNull();
    expect(d.overviewLanguage).toBeNull();
    const s = await fetchRichSeason(tmdb, 103147, 1, CHAIN, { now: new Date("2026-01-01") });
    const [e1, e2, e3] = s.episodes;
    expect(e1).toMatchObject({ name: "心动不如行动，大胆亮出底牌！", nameLanguage: "zh-CN", overview: null });
    expect(e1!.overviewLanguage).toBeNull();
    // 标题:zh-CN 是占位名,回退到 en-US;简介仍不回退
    expect(e2).toMatchObject({ name: "Who Is the One?", nameLanguage: "en-US", overview: null });
    expect(e3).toMatchObject({ name: "约会之夜", overview: "約會之夜。", overviewLanguage: "zh-TW" });
    // 补拉 en-US 只为了标题
    expect(s.fetchedLanguages).toEqual(CHAIN);

    const any = await fetchRichSeason(tmdb, 103147, 1, CHAIN, {
      now: new Date("2026-01-01"),
      overviewNonChineseFallback: true,
    });
    expect(any.episodes[0]).toMatchObject({
      overview: "If Your Heart Skips a Beat, Play Your Cards Openly!",
      overviewLanguage: "en-US",
    });
    const anyD = await fetchRichDetail(tmdb, "tv", 103147, CHAIN, { overviewNonChineseFallback: true });
    expect(anyD).toMatchObject({ overview: "A Chinese dating reality show.", overviewLanguage: "en-US" });
    expect(mock.calls.length).toBeGreaterThan(0);
  });

  it("MD-2 标题都齐、只缺简介时,中文变体走完就停,不为简介补拉英文", async () => {
    const fx = {
      ...HEART_SIGNAL_FIXTURE,
      seasons: [
        {
          ...HEART_SIGNAL_FIXTURE.seasons![0]!,
          overviews: { "zh-CN": "第一季。" },
          episodes: [HEART_SIGNAL_FIXTURE.seasons![0]!.episodes[0]!],
        },
      ],
    };
    mock = await createMockTmdb({ fixtures: [fx] });
    const tmdb = createTmdbClient({ baseUrl: `${mock.url}/3`, apiKey: "test-tmdb-key", retries: 0, timeoutMs: 1000 });
    const s = await fetchRichSeason(tmdb, 103147, 1, CHAIN, { now: new Date("2026-01-01") });
    expect(s.episodes[0]!.overview).toBeNull();
    expect(s.fetchedLanguages).toEqual(["zh-CN", "zh-SG", "zh-TW", "zh-HK"]);
  });

  it("补拉走请求缓存:同一季第二次不再请求", async () => {
    const { tmdb, mock } = await setup();
    await fetchRichSeason(tmdb, 95396, 1, CHAIN, { now: new Date("2026-01-01") });
    const n = mock.calls.length;
    await fetchRichSeason(tmdb, 95396, 1, CHAIN, { now: new Date("2026-01-01") });
    expect(mock.calls.length).toBe(n);
  });
});