/**
 * 标题识别差分:把 MP MetaInfo 输出与我们的 ParsedRelease 映射到同一"规范形",逐字段比较。
 * 规范化只抹平表示差异(大小写、分隔符、同义写法),不抹平语义差异;语义差异登记在 meta-deviations.json。
 */
import { readFileSync } from "node:fs";
import { type ParsedRelease, parseRelease, parseReleasePath } from "../../src/release-parser/index.ts";

export interface MetaSample {
  id: string;
  kind: "title" | "path";
  input: string;
  subtitle?: string;
  source: string;
  ourNote?: string;
}

export type MpMeta = Record<string, string | number | null> & { error?: string };

export type DeviationKind = "intentional" | "missing" | "our_bug" | "mp_bug" | "representation";
export interface Deviation {
  kind: DeviationKind;
  mp: string | null;
  ours: string | null;
  note: string;
}

/** 参与比较的字段(media_id = find_metainfo 显式 ID 标签;edition = resource_type + resource_effect,由这两项覆盖;customization 双方均未配置) */
export const FIELDS = [
  "name",
  "cn_name",
  "en_name",
  "year",
  "type",
  "begin_season",
  "end_season",
  "begin_episode",
  "end_episode",
  "resource_pix",
  "resource_type",
  "resource_effect",
  "video_encode",
  "audio_encode",
  "resource_team",
  "part",
  "web_source",
  "media_id",
] as const;
export type Field = (typeof FIELDS)[number];
export type Canon = Record<Field, string | null>;

const readJson = <T>(name: string): T => JSON.parse(readFileSync(new URL(`./${name}`, import.meta.url), "utf8")) as T;

export function loadMeta() {
  const samples = readJson<{ samples: MetaSample[] }>("meta-samples.json").samples;
  const mp = readJson<{ python: Record<string, MpMeta>; rustMismatch: Record<string, unknown> }>("meta-mp.json");
  const deviations = readJson<{ deviations: Record<string, Partial<Record<Field, Deviation>>> }>(
    "meta-deviations.json",
  ).deviations;
  return { samples, mp, deviations };
}

const str = (v: unknown): string | null => (v === null || v === undefined || v === "" ? null : String(v));
/** 名称:忽略大小写与标点/空白(MP 英文名做 Title Case,我们保留原大小写) */
const canonName = (v: unknown) => {
  const s = str(v);
  return s === null
    ? null
    : s
        .normalize("NFKC")
        .toLowerCase()
        .replace(/[\s._\-:：·'’!！?？,，&]+/g, "") || null;
};

function canonSource(v: string | null): string | null {
  if (!v) return null;
  const u = v.toUpperCase();
  const cls = /REMUX/.test(u)
    ? "REMUX"
    : /BLURAY|BDRIP|\bBD\b|BLU/.test(u)
      ? "BluRay"
      : /WEB-?DL|^WEB$|\bWEB\b(?!RIP)/.test(u)
        ? "WEB-DL"
        : /WEBRIP/.test(u)
          ? "WEBRip"
          : /HDTV|UHDTV/.test(u)
            ? "HDTV"
            : /HDRIP/.test(u)
              ? "HDRip"
              : /DVD/.test(u)
                ? "DVD"
                : /HDDVD/.test(u)
                  ? "HDDVD"
                  : null;
  const uhd = /\bUHD\b/.test(u.replace(/UHDTV/g, "")) ? "UHD " : "";
  return `${uhd}${cls ?? `?${u}`}`.trim();
}

const HDR_CANON: Record<string, string> = {
  HDR: "HDR10",
  HDR10: "HDR10",
  "HDR10+": "HDR10+",
  HDR10PLUS: "HDR10+",
  HDR10P: "HDR10+",
  DV: "DV",
  DOVI: "DV",
  HLG: "HLG",
  HDRVIVID: "HDR Vivid",
  VIVID: "HDR Vivid",
  "HDR VIVID": "HDR Vivid",
};
function canonHdrList(tokens: string[]): string | null {
  const set = new Set<string>();
  for (const t of tokens) {
    const k = t.toUpperCase().replace(/\s+/g, "");
    set.add(HDR_CANON[k] ?? HDR_CANON[t.toUpperCase()] ?? `?${t}`);
  }
  return set.size ? [...set].sort().join(",") : null;
}

function canonCodec(v: string | null): string | null {
  if (!v) return null;
  const u = v.toUpperCase().replace(/[\s.]/g, "");
  if (/265|HEVC/.test(u)) return "H.265";
  if (/264|AVC/.test(u)) return "H.264";
  if (/AV1/.test(u)) return "AV1";
  if (/VC-?1/.test(u)) return "VC-1";
  if (/MPEG-?2/.test(u)) return "MPEG-2";
  if (/XVID/.test(u)) return "XVID";
  if (/DIVX/.test(u)) return "DIVX";
  return `?${u}`;
}

const canonAudio = (v: string | null) =>
  v
    ? v
        .toUpperCase()
        .replace(/DD\+/g, "DDP")
        .replace(/[\s\-_.]/g, "") || null
    : null;

const canonGroups = (v: string | null) =>
  v
    ? v
        .split(/[@&]/)
        .map((g) => g.trim().toLowerCase())
        .filter(Boolean)
        .sort()
        .join("@")
    : null;

function canonPix(v: string | null): string | null {
  if (!v) return null;
  const u = v.toLowerCase();
  return ({ "4k": "2160p", "8k": "4320p", "2k": "1440p" } as Record<string, string>)[u] ?? u;
}

const canonPart = (v: string | null) => (v ? v.toUpperCase().replace(/[\s._-]/g, "") : null);
const canonType = (v: string | null) =>
  v === "电视剧" ? "tv" : v === "电影" ? "movie" : v === "未知" || v === null ? "unknown" : v;

export function canonMp(m: MpMeta): Canon {
  const effect = str(m.resource_effect);
  const hdrTokens = effect ? effect.split(/\s+/).filter((t) => /^(HDR|DV|DOVI|HLG|VIVID|HDRVIVID)/i.test(t)) : [];
  return {
    name: canonName(m.name),
    cn_name: canonName(m.cn_name),
    en_name: canonName(m.en_name),
    year: str(m.year),
    type: canonType(str(m.type)),
    begin_season: str(m.begin_season),
    end_season: str(m.end_season),
    begin_episode: str(m.begin_episode),
    end_episode: str(m.end_episode),
    resource_pix: canonPix(str(m.resource_pix)),
    resource_type: canonSource(str(m.resource_type)),
    resource_effect: canonHdrList(hdrTokens),
    video_encode: canonCodec(str(m.video_encode)),
    audio_encode: canonAudio(str(m.audio_encode)),
    resource_team: canonGroups(str(m.resource_team)),
    part: canonPart(str(m.part)),
    web_source: canonName(m.web_source),
    media_id: m.media_id ? `${m.media_source}:${m.media_id}` : null,
  };
}

const PROVIDER: Record<string, string> = {
  tmdb: "themoviedb",
  douban: "douban",
  imdb: "imdb",
  tvdb: "tvdb",
  bangumi: "bangumi",
  anilist: "anilist",
};

export function oursParse(s: MetaSample): ParsedRelease {
  return s.kind === "path"
    ? parseReleasePath(s.input)
    : parseRelease(s.input, s.subtitle ? { subtitle: s.subtitle } : {});
}

export function canonOurs(r: ParsedRelease): Canon {
  const src = r.source
    ? `${r.uhd ? "UHD " : ""}${r.source === "BluRay-Disc" ? "BluRay" : r.source === "DVDRip" ? "DVD" : r.source}`
    : r.uhd
      ? "UHD ?"
      : null;
  const eps = r.episodes;
  return {
    name: canonName(r.title),
    cn_name: canonName(r.titleCn),
    en_name: canonName(r.titleEn),
    year: str(r.year),
    type: r.mediaTypeHint,
    begin_season: str(r.season),
    end_season: str(r.seasonEnd),
    begin_episode: str(eps?.start),
    end_episode: eps && eps.end !== eps.start ? String(eps.end) : null,
    resource_pix: canonPix(str(r.resolution)),
    resource_type: src,
    resource_effect: r.hdr.length ? canonHdrList(r.hdr) : null,
    video_encode: canonCodec(str(r.videoCodec)),
    audio_encode: r.audio.length ? canonAudio(r.audio.join(" ")) : null,
    resource_team: canonGroups(str(r.releaseGroup?.name)),
    part: canonPart(str(r.part)),
    web_source: canonName(r.webSource),
    media_id: r.explicitIds[0] ? `${PROVIDER[r.explicitIds[0].provider]}:${r.explicitIds[0].id}` : null,
  };
}

/** 逐字段差异(规范形不等) */
export function diffSample(
  s: MetaSample,
  mp: MpMeta,
): Partial<Record<Field, { mp: string | null; ours: string | null }>> {
  const a = canonMp(mp);
  const b = canonOurs(oursParse(s));
  const out: Partial<Record<Field, { mp: string | null; ours: string | null }>> = {};
  for (const f of FIELDS) if (a[f] !== b[f]) out[f] = { mp: a[f], ours: b[f] };
  return out;
}