/**
 * 身份匹配差分(ID-2):憨憨真实标题 → parseRelease → TMDB 候选召回(recallTmdbCandidates)→ resolveIdentity,
 * 与 MoviePilot(MetaInfo + TheMovieDbModule 名称识别链,见 gen-identity-mp.py)逐条比对。
 *
 * 数据在 packages/domain/test/differential/identity/:
 *   samples.json        输入标题(用户栈只读导出)
 *   mp.json             MP 侧期望(gen-identity-mp.py 生成)
 *   tmdb-fixtures.json  我们侧用到的 TMDB 响应(脱敏裁剪,测试离线回放)
 *   deviations.json     逐条归因(mp_defect / intentional / known_gap)
 *   poisoned-local.json 真机误识别:含分类词别名的本地作品(回归「电视剧」别名把 15 条资源并入一部剧)
 * 重新录制:identity-differential.run.ts(走本地 TMDB 缓存代理)。
 */
import { readFileSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
import { recallTmdbCandidates, TmdbClient } from "@umt/adapters";
import { type IdentityCandidate, type IdentityResolution, parseRelease, resolveIdentity } from "@umt/domain";
import { localIdentityCandidate } from "@umt/mapping";
import { tmdbRecallInput, tmdbToCandidate } from "../../src/modules/sources-identity/service/tmdb-candidate.ts";

export const DATA_DIR = join(
  dirname(fileURLToPath(import.meta.url)),
  "../../../../packages/domain/test/differential/identity",
);

export interface Sample {
  id: string;
  work: string;
  kind: string;
  title: string;
  subtitle: string | null;
}
export interface MpResult {
  meta?: Record<string, unknown>;
  names?: string[];
  match: { tmdbId: number; type: "movie" | "tv"; title: string; year: number | null; by: string } | null;
  error?: string;
}
export type Verdict = "consistent" | "ours_missed" | "ours_wrong" | "ours_extra";
export interface Deviation {
  kind: "mp_defect" | "intentional" | "known_gap";
  expect?: string | null;
  note: string;
}
export interface Row {
  id: string;
  title: string;
  parsed: { titleCn?: string; titleEn?: string; altTitles?: string[]; year?: number; season?: number };
  mp: string | null;
  ours: string | null;
  status: IdentityResolution["status"];
  reason: string;
  best: string | null;
  bestEvidence: string[];
  verdict: Verdict;
  deviation?: Deviation;
}

const readJson = <T>(f: string): T => JSON.parse(readFileSync(join(DATA_DIR, f), "utf8")) as T;

export function loadData() {
  return {
    samples: readJson<{ samples: Sample[] }>("samples.json").samples,
    mp: readJson<{ results: Record<string, MpResult> }>("mp.json").results,
    deviations: readJson<{ deviations: Record<string, Deviation> }>("deviations.json").deviations,
  };
}

/** TMDB 请求的缓存键:路径 + 排序后的参数(去掉凭证) */
export function fixtureKey(url: string): string {
  const u = new URL(url);
  const params = [...u.searchParams.entries()].filter(([k]) => k !== "api_key").sort(([a], [b]) => a.localeCompare(b));
  return `${u.pathname.replace(/^\/3/, "")}?${new URLSearchParams(params).toString()}`;
}

const pick = (o: Record<string, unknown>, keys: string[]) =>
  Object.fromEntries(keys.filter((k) => o[k] !== undefined && o[k] !== null).map((k) => [k, o[k]]));
const BRIEF = [
  "id",
  "media_type",
  "title",
  "name",
  "original_title",
  "original_name",
  "original_language",
  "release_date",
  "first_air_date",
  "popularity",
  "origin_country",
];

/** 只留识别用到的字段(标题、日期、别名、译名标题、外部 ID、季列表) */
export function trimTmdb(body: unknown): unknown {
  const b = body as Record<string, unknown>;
  if (Array.isArray(b.results)) {
    return { results: (b.results as Record<string, unknown>[]).map((r) => pick(r, BRIEF)) };
  }
  const out = pick(b, BRIEF);
  const alt = b.alternative_titles as Record<string, unknown[]> | undefined;
  if (alt) {
    const list = (alt.titles ?? alt.results ?? []) as Record<string, unknown>[];
    out.alternative_titles = { [alt.titles ? "titles" : "results"]: list.map((a) => pick(a, ["title", "iso_3166_1"])) };
  }
  const tr = (b.translations as { translations?: Record<string, unknown>[] } | undefined)?.translations;
  if (tr) {
    out.translations = {
      translations: tr
        .map((t) => ({
          iso_639_1: t.iso_639_1,
          iso_3166_1: t.iso_3166_1,
          data: pick((t.data ?? {}) as Record<string, unknown>, ["title", "name"]),
        }))
        .filter((t) => Object.keys(t.data).length),
    };
  }
  const ext = b.external_ids as Record<string, unknown> | undefined;
  if (ext) out.external_ids = pick(ext, ["imdb_id", "tvdb_id"]);
  if (Array.isArray(b.seasons))
    out.seasons = (b.seasons as Record<string, unknown>[]).map((s) =>
      pick(s, ["season_number", "air_date", "episode_count", "name"]),
    );
  return out;
}

/** 离线回放:按键取录制的响应;没录到的请求直接报错(说明召回逻辑变了,需要重新录制) */
export function fixtureFetch(fixtures: Record<string, unknown>): typeof fetch {
  return (async (input: string | URL | Request) => {
    const url = typeof input === "string" ? input : input instanceof URL ? input.href : input.url;
    const key = fixtureKey(url);
    if (!(key in fixtures)) throw new Error(`TMDB 回放缺少请求 ${key}(召回逻辑变化,需重新录制)`);
    const body = fixtures[key] as { __status?: number };
    const status = body.__status ?? 200;
    return new Response(JSON.stringify(status === 200 ? body : { status_message: "not found" }), {
      status,
      headers: { "content-type": "application/json" },
    });
  }) as typeof fetch;
}

export function tmdbFor(fetchImpl: typeof fetch, baseUrl = "http://tmdb.fixture/3"): TmdbClient {
  return new TmdbClient({ apiKey: "x", baseUrl, fetch: fetchImpl, retries: 0 });
}

const keyOf = (c: { entityType: string; externalId: string } | undefined) =>
  c ? `${c.entityType}:${c.externalId}` : null;

/** 单条:解析 → 召回 → 打分(local = 额外的本地候选,例如真机误识别场景) */
export async function resolveSample(tmdb: TmdbClient, s: Sample, local: IdentityCandidate[] = []) {
  const parsed = parseRelease(s.title, s.subtitle ? { subtitle: s.subtitle } : {});
  const remote = await recallTmdbCandidates(tmdb, tmdbRecallInput(parsed));
  const resolution = resolveIdentity(parsed, [...local, ...remote.map(tmdbToCandidate)]);
  return { parsed, resolution };
}

export async function runDifferential(tmdb: TmdbClient): Promise<Row[]> {
  const { samples, mp, deviations } = loadData();
  const rows: Row[] = [];
  for (const s of samples) {
    const { parsed, resolution } = await resolveSample(tmdb, s);
    const m = mp[s.id]?.match ?? null;
    const mpKey = m ? `${m.type}:${m.tmdbId}` : null;
    const best = resolution.best?.candidate;
    const ours = resolution.status === "auto" ? keyOf(best) : null;
    const verdict: Verdict =
      mpKey === ours ? "consistent" : !ours ? "ours_missed" : !mpKey ? "ours_extra" : "ours_wrong";
    rows.push({
      id: s.id,
      title: s.title,
      parsed: {
        ...(parsed.titleCn ? { titleCn: parsed.titleCn } : {}),
        ...(parsed.titleEn ? { titleEn: parsed.titleEn } : {}),
        ...(parsed.altTitles ? { altTitles: parsed.altTitles } : {}),
        ...(parsed.year !== undefined ? { year: parsed.year } : {}),
        ...(parsed.season !== undefined ? { season: parsed.season } : {}),
      },
      mp: mpKey,
      ours,
      status: resolution.status,
      reason: resolution.reason,
      best: best ? `${keyOf(best)} ${best.titles[0] ?? ""} ${best.year ?? ""}`.trim() : null,
      bestEvidence: resolution.best ? [`level:${resolution.best.level}`, ...resolution.best.evidence] : [],
      verdict,
      ...(deviations[s.id] ? { deviation: deviations[s.id] } : {}),
    });
  }
  return rows;
}

/** 汇总:非故意偏离项的一致率(MP 缺陷且我们正确的计为一致) */
export function summarize(rows: Row[]) {
  const scored = rows.filter((r) => r.deviation?.kind !== "intentional");
  const ok = scored.filter(
    (r) => r.verdict === "consistent" || (r.deviation?.kind === "mp_defect" && r.ours === (r.deviation.expect ?? null)),
  );
  const count = (v: Verdict) => rows.filter((r) => r.verdict === v).length;
  return {
    samples: rows.length,
    works: new Set(loadData().samples.map((s) => s.work)).size,
    consistent: count("consistent"),
    oursMissed: count("ours_missed"),
    oursWrong: count("ours_wrong"),
    oursExtra: count("ours_extra"),
    intentional: rows.length - scored.length,
    mpDefect: rows.filter((r) => r.deviation?.kind === "mp_defect").length,
    rate: scored.length ? ok.length / scored.length : 1,
  };
}

export interface PoisonedCase {
  title: string;
  subtitle: string | null;
  /** 正确的 TMDB 身份 type:id,或 not_local = 不得自动并入被污染的本地作品 */
  expect: string;
}

/** 真机误识别回归:带「电视剧」等错误站点别名的本地作品 + 被误并入的资源,重新识别的结果 */
export async function runPoisoned(tmdb: TmdbClient) {
  const d = readJson<{
    entity: { id: string; kind: "series"; title: string; originalTitle: string; year: number };
    aliases: string[];
    identities: { provider: string; externalId: string; status: "accepted" }[];
    cases: PoisonedCase[];
  }>("poisoned-local.json");
  const local = localIdentityCandidate(d.entity, d.aliases, d.identities)!;
  const out: { c: PoisonedCase; status: string; best: string | null; local: boolean; ok: boolean }[] = [];
  for (const c of d.cases) {
    const s: Sample = { id: "poisoned", work: "", kind: "", title: c.title, subtitle: c.subtitle };
    const { resolution } = await resolveSample(tmdb, s, [local]);
    const best = resolution.best?.candidate;
    const auto = resolution.status === "auto";
    // 本地作品已映射 tmdb:312027:自动并入本地作品等价于识别为该 TMDB 身份
    const key = !auto || !best ? null : best.provider === "local" ? "local" : keyOf(best);
    const effective = key === "local" ? "tv:312027" : key;
    const ok = c.expect === "not_local" ? key !== "local" : effective === c.expect;
    out.push({ c, status: resolution.status, best: key, local: key === "local", ok });
  }
  return out;
}