class AniCrush {
  constructor() {
    this.type = "anime-streaming";
    this.version = "1.0.1";
    this.baseUrl = "https://anicrush.to";
    this.apiBase = "https://api.anicrush.to";
  }

  getSettings() {
    return {
      episodeServers: ["Southcloud-1", "Southcloud-2", "Southcloud-3"],
      supportsSub: true,
      supportsDub: true,
      supportsHls: true
    };
  }

  _nativeFetch(url, method, headers, body) {
    const raw = Native.fetch(
      String(url),
      method || "GET",
      JSON.stringify(headers || {}),
      body == null ? "" : String(body)
    );
    try {
      return JSON.parse(raw || "{}");
    } catch (e) {
      return { ok: false, status: 0, headers: {}, body: "" };
    }
  }

  _getText(url, headers) {
    const res = this._nativeFetch(url, "GET", headers, "");
    return String(res.body || "");
  }

  _getJson(url, headers) {
    const res = this._nativeFetch(url, "GET", headers, "");
    try {
      return JSON.parse(String(res.body || "{}"));
    } catch (e) {
      return {};
    }
  }

  _safeStr(v) {
    return typeof v === "string" ? v : (v == null ? "" : String(v));
  }

  _headers() {
    return {
      "User-Agent": "Mozilla/5.0",
      "Accept": "application/json",
      "Referer": this.baseUrl + "/",
      "Origin": this.baseUrl,
      "X-Site": "anicrush"
    };
  }

  _parseQuery(q) {
    if (typeof q === "string") {
      const s = q.trim();
      if (s.startsWith("{") || s.startsWith("[")) {
        try { return JSON.parse(s); } catch (e) { return { query: s }; }
      }
      return { query: s };
    }
    return q || {};
  }

  _stripYearHints(raw) {
    const s = this._safeStr(raw).trim();
    if (!s) return "";
    return s
      .replace(/\((?:19|20)\d{2}\)/g, " ")
      .replace(/\b(?:19|20)\d{2}\b/g, " ")
      .replace(/\s+/g, " ")
      .trim();
  }

  _normalize(title) {
    return (this._safeStr(this._stripYearHints(title)))
      .toLowerCase()
      .replace(/(season|cour|part)/g, "")
      .replace(/\d+(st|nd|rd|th)/g, (m) => m.replace(/st|nd|rd|th/, ""))
      .replace(/[^a-z0-9]+/g, "")
      .replace(/(?<!i)ii(?!i)/g, "2");
  }

  _normalizeTitle(title) {
    return (this._safeStr(this._stripYearHints(title)))
      .toLowerCase()
      .replace(/(season|cour|part|uncensored)/g, "")
      .replace(/\d+(st|nd|rd|th)/g, (m) => m.replace(/st|nd|rd|th/, ""))
      .replace(/[^a-z0-9]+/g, "");
  }

  _normalizeDate(dateStr) {
    const s = this._safeStr(dateStr);
    if (!s) return null;
    const months = {
      Jan: "01", Feb: "02", Mar: "03", Apr: "04",
      May: "05", Jun: "06", Jul: "07", Aug: "08",
      Sep: "09", Oct: "10", Nov: "11", Dec: "12"
    };
    const m = s.match(/([A-Za-z]+)\s+\d{1,2},\s*(\d{4})/);
    if (!m) return null;
    const mm = months[m[1]];
    if (!mm) return null;
    return { year: parseInt(m[2], 10), month: parseInt(mm, 10) };
  }

  _levSim(a, b) {
    a = this._safeStr(a);
    b = this._safeStr(b);
    const lenA = a.length;
    const lenB = b.length;
    if (!lenA && !lenB) return 1;
    if (!lenA || !lenB) return 0;

    const dp = [];
    for (let i = 0; i <= lenA; i++) {
      dp[i] = [];
      dp[i][0] = i;
    }
    for (let j = 0; j <= lenB; j++) dp[0][j] = j;

    for (let i = 1; i <= lenA; i++) {
      for (let j = 1; j <= lenB; j++) {
        if (a[i - 1] === b[j - 1]) dp[i][j] = dp[i - 1][j - 1];
        else dp[i][j] = 1 + Math.min(dp[i - 1][j], dp[i][j - 1], dp[i - 1][j - 1]);
      }
    }

    const distance = dp[lenA][lenB];
    const maxLen = Math.max(lenA, lenB);
    return 1 - distance / maxLen;
  }

  search(query) {
    query = this._parseQuery(query);

    const q = this._safeStr(query.query).trim();
    if (!q) return [];

    const media = query.media || {};
    const start = (media.startDate || {});
    const targetNormJP = this._normalize(media.romajiTitle);
    const targetNorm = media.englishTitle ? this._normalize(media.englishTitle) : targetNormJP;

    const url = `${this.apiBase}/shared/v2/movie/list?keyword=${encodeURIComponent(q)}&limit=48&page=1`;
    const json = this._getJson(url, this._headers());

    const movies = (((json || {}).result || {}).movies) || [];
    if (!Array.isArray(movies) || !movies.length) return [];

    let matches = movies.map((movie) => {
      const id = movie && movie.id != null ? String(movie.id) : "";
      const slug = movie && movie.slug ? String(movie.slug) : "";
      if (!id || !slug) return null;

      const titleJP = movie && movie.name ? String(movie.name) : "";
      const titleEN = movie && movie.name_english ? String(movie.name_english) : "";
      const title = titleEN || titleJP || "Unknown";

      return {
        id,
        pageUrl: slug,
        title,
        titleJP,
        normTitleJP: this._normalize(titleJP),
        normTitle: this._normalize(title),
        dub: !!(movie && movie.has_dub),
        startDate: this._normalizeDate(movie && movie.aired_from ? String(movie.aired_from) : "")
      };
    }).filter(Boolean);

    if (query.dub) matches = matches.filter(m => m.dub);

    let filtered = matches.filter(m => {
      const titleMatch = (m.normTitle === targetNorm) || (m.normTitleJP === targetNormJP);
      const dateMatch =
        (m.startDate && m.startDate.year === start.year) &&
        (m.startDate && m.startDate.month === start.month);
      return titleMatch && dateMatch;
    });

    if (!filtered.length) {
      filtered = matches.filter(m => {
        const titleMatch = (m.normTitle === targetNorm) || (m.normTitleJP === targetNormJP);
        const dateMatch = (m.startDate && m.startDate.year === start.year);
        return titleMatch && dateMatch;
      });
    }

    if (!filtered.length) {
      filtered = matches.filter(m => {
        const titleMatch =
          m.normTitle.includes(targetNorm) ||
          m.normTitleJP.includes(targetNormJP) ||
          targetNorm.includes(m.normTitle) ||
          targetNormJP.includes(m.normTitleJP) ||
          this._levSim(m.normTitle, targetNorm) > 0.7 ||
          this._levSim(m.normTitleJP, targetNormJP) > 0.7;

        const dateMatch =
          (m.startDate && m.startDate.year === start.year) &&
          (m.startDate && m.startDate.month === start.month);

        return titleMatch && dateMatch;
      });
    }

    if (!filtered.length) {
      filtered = matches.filter(m => {
        const titleMatch =
          m.normTitle.includes(targetNorm) ||
          m.normTitleJP.includes(targetNormJP) ||
          targetNorm.includes(m.normTitle) ||
          targetNormJP.includes(m.normTitleJP) ||
          this._levSim(m.normTitle, targetNorm) > 0.7 ||
          this._levSim(m.normTitleJP, targetNormJP) > 0.7;

        const dateMatch = (m.startDate && m.startDate.year === start.year);
        return titleMatch && dateMatch;
      });
    }

    let results = filtered.map(m => ({
      id: `${m.id}/${query.dub ? "dub" : "sub"}`,
      title: m.title,
      url: `${this.baseUrl}/detail/${m.pageUrl}.${m.id}`,
      subOrDub: query.dub ? "dub" : "sub"
    }));

    if (!media.startDate || !media.startDate.year) {
      const qn = this._normalizeTitle(q);
      filtered = matches.filter(m => {
        const a = this._normalizeTitle(m.title);
        const aj = this._normalizeTitle(m.titleJP);
        return (
          a === qn || aj === qn ||
          a.includes(qn) || aj.includes(qn) ||
          qn.includes(a) || qn.includes(aj)
        );
      });

      filtered.sort((a, b) => {
        const A = this._normalizeTitle(a.title);
        const B = this._normalizeTitle(b.title);
        if (A.length !== B.length) return A.length - B.length;
        return A.localeCompare(B);
      });

      results = filtered.map(m => ({
        id: `${m.id}/${query.dub ? "dub" : "sub"}`,
        title: m.title,
        url: `${this.baseUrl}/detail/${m.pageUrl}.${m.id}`,
        subOrDub: query.dub ? "dub" : "sub"
      }));
    }

    return results;
  }

  findEpisodes(Id) {
    const parts = String(Id || "").split("/");
    const id = parts[0];
    const subOrDub = parts[1] || "sub";
    if (!id) throw new Error("Missing id");

    const url = `${this.apiBase}/shared/v2/episode/list?_movieId=${encodeURIComponent(id)}`;
    const epJson = this._getJson(url, this._headers());
    const episodeGroups = (epJson && epJson.result) ? epJson.result : {};

    const episodes = [];
    const keys = Object.keys(episodeGroups || {});
    for (let i = 0; i < keys.length; i++) {
      const group = episodeGroups[keys[i]];
      if (!Array.isArray(group)) continue;
      for (let j = 0; j < group.length; j++) {
        const ep = group[j] || {};
        const num = Number(ep.number);
        if (!Number.isFinite(num)) continue;
        episodes.push({
          id: `${id}/${subOrDub}`,
          number: num,
          title: ep.name_english ? String(ep.name_english) : (ep.name ? String(ep.name) : `Episode ${num}`),
          url: ""
        });
      }
    }

    episodes.sort((a, b) => (a.number || 0) - (b.number || 0));
    return episodes;
  }

  findEpisodeServer(episode, _server) {
    if (typeof episode === "string") {
      try { episode = JSON.parse(episode); } catch (e) {}
    }
    episode = episode || {};

    const parts = String(episode.id || "").split("/");
    const id = parts[0];
    const subOrDub = parts[1] || "sub";
    if (!id) throw new Error("Missing id");

    const epNum = Number(episode.number);
    if (!Number.isFinite(epNum)) throw new Error("Missing episode number");

    let server = String(_server || "").trim();
    if (!server || server === "default") server = "Southcloud-1";

    if (server === "HD-1") server = "Southcloud-1";
    if (server === "HD-2") server = "Southcloud-2";
    if (server === "HD-3") server = "Southcloud-3";

    const serverMap = { "Southcloud-1": 4, "Southcloud-2": 1, "Southcloud-3": 6 };
    const sv = serverMap[server] != null ? serverMap[server] : 4;

    const encryptedLinkUrl =
      `${this.apiBase}/shared/v2/episode/sources?_movieId=${encodeURIComponent(id)}` +
      `&ep=${encodeURIComponent(String(epNum))}` +
      `&sv=${encodeURIComponent(String(sv))}` +
      `&sc=${encodeURIComponent(String(subOrDub))}`;

    const json = this._getJson(encryptedLinkUrl, this._headers());
    const encryptedIframe = (((json || {}).result || {}).link) ? String(json.result.link) : "";
    if (!encryptedIframe) {
      throw new Error(`Missing encrypted iframe link (server=${server} sv=${sv} sc=${subOrDub})`);
    }

    let decryptData = null;
    let requiredHeaders = null;

    try {
      decryptData = this.extractMegaCloudSync(encryptedIframe);
      requiredHeaders = decryptData && decryptData.headersProvided ? decryptData.headersProvided : null;
    } catch (e) {}

    if (!decryptData) {
      decryptData = this._getJson(
        `https://ac-api.ofchaos.com/api/anime/embed/convert/v2?embedUrl=${encodeURIComponent(encryptedIframe)}`,
        {}
      );
      requiredHeaders = {
        Referer: "https://megacloud.club/",
        Origin: "https://megacloud.club",
        "User-Agent":
          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36",
        "X-Requested-With": "XMLHttpRequest"
      };
    }

    if (!decryptData || !decryptData.sources) throw new Error("No video sources from any decrypter");

    const sources = decryptData.sources || [];
    const streamSource =
      sources.find((s) => s && s.type === "hls") ||
      sources.find((s) => s && s.type === "mp4");

    if (!streamSource || !streamSource.file) throw new Error("No valid stream file found");

    const subtitles = (decryptData.tracks || [])
      .filter((t) => t && t.kind === "captions" && t.file)
      .map((track, index) => ({
        id: `sub-${index}`,
        language: track.label || "Unknown",
        url: track.file,
        isDefault: !!track.default
      }));

    const outType = (String(streamSource.type || "") === "hls") ? "m3u8" : "mp4";

    return {
      server: server,
      headers: requiredHeaders || {},
      videoSources: [
        {
          url: streamSource.file,
          type: outType,
          quality: "auto",
          subtitles
        }
      ]
    };
  }

  extractMegaCloudSync(embedUrl) {
    const s = String(embedUrl || "");
    const mm = s.match(/^(https?):\/\/([^\/]+)(\/.*)?$/i);
    if (!mm) throw new Error("Invalid embedUrl");

    const protocol = mm[1].toLowerCase();
    const host = mm[2];
    const baseDomain = `${protocol}://${host}/`;

    const headers = {
      Accept: "*/*",
      "X-Requested-With": "XMLHttpRequest",
      Referer: baseDomain,
      Origin: `${protocol}://${host}`,
      "User-Agent":
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36"
    };

    const html = this._getText(embedUrl, headers);

    const fileIdMatch = html.match(/<title>\s*File\s+#([a-zA-Z0-9]+)\s*-/i);
    if (!fileIdMatch) throw new Error("file_id not found in embed page");
    const fileId = fileIdMatch[1];

    let nonce = null;
    const match48 = html.match(/\b[a-zA-Z0-9]{48}\b/);
    if (match48) nonce = match48[0];
    else {
      const match3x16 = [];
      const re = /["']([A-Za-z0-9]{16})["']/g;
      let m;
      while ((m = re.exec(html)) !== null) match3x16.push(m[1]);
      if (match3x16.length >= 3) nonce = match3x16[0] + match3x16[1] + match3x16[2];
    }
    if (!nonce) throw new Error("nonce not found");

    const sourcesJson = this._getJson(
      `${baseDomain}embed-2/v3/e-1/getSources?id=${fileId}&_k=${nonce}`,
      headers
    );

    return {
      sources: sourcesJson.sources || [],
      tracks: sourcesJson.tracks || [],
      intro: sourcesJson.intro || null,
      outro: sourcesJson.outro || null,
      server: sourcesJson.server || null,
      headersProvided: headers
    };
  }
}

module.exports = new AniCrush();