class HiAnime {
  constructor() {
    this.type = "anime-streaming";
    this.version = "1.0.4";
    this.baseUrl = "https://hianime.to";
  }

  getSettings() {
    return {
      episodeServers: ["HD-1", "HD-2", "HD-3", "HD-4"],
      supportsDub: 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, "");
    const body = String(res.body || "");
    try {
      return JSON.parse(body || "{}");
    } catch (e) {
      return { _raw: body };
    }
  }

  safeString(str) {
    return (typeof str === "string" ? str : "");
  }

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

  _decodeHtml(str) {
    return String(str || "")
      .replace(/\\u0026/g, "&")
      .replace(/&#(\d+);?/g, (m, dec) => {
        const n = parseInt(dec, 10);
        if (!isFinite(n)) return m;
        return String.fromCharCode(n);
      })
      .replace(/"/g, '"')
      .replace(/'/g, "'")
      .replace(/&/g, "&")
      .replace(/&lt;/g, "<")
      .replace(/&gt;/g, ">")
      .replace(/&#x2F;/g, "/");
  }

  _headers() {
    return {
      "User-Agent": "Mozilla/5.0",
      "Accept": "*/*",
      "Referer": this.baseUrl + "/",
      "Origin": this.baseUrl,
      "X-Requested-With": "XMLHttpRequest"
    };
  }

  _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 || {};
  }

  _wantTrackFromEpisode(ep) {
    const e = ep || {};
    if (typeof e.dub === "boolean") return e.dub ? "dub" : "sub";

    const sod = String(e.subOrDub || "").toLowerCase();
    if (sod === "dub" || sod === "sub") return sod;

    const tr = String(e.track || "").toLowerCase();
    if (tr === "dub" || tr === "sub") return tr;

    const id = String(e.id || "");
    const parts = id.split("/");
    const last = (parts.length >= 2 ? parts[parts.length - 1] : "").toLowerCase();
    if (last === "dub" || last === "sub") return last;

    return "sub";
  }

  _extractWatchIdFromUrl(url) {
    const s = String(url || "");
    const m = s.match(/\/watch\/[^\/]+-(\d+)/i);
    return m ? m[1] : "";
  }

  search(a1) {
    const query = this._parseQuery(a1);

    const normalize = (str) =>
      this.safeString(str).toLowerCase().replace(/[^a-z0-9]+/g, "");

    const media = query.media || {};
    const start = media.startDate || {};
    const q = this.safeString(query.query || "").trim();
    if (!q) return "[]";

    const url = `${this.baseUrl}/search?keyword=${encodeURIComponent(q)}&sy=${encodeURIComponent(String(start.year || ""))}&sm=${encodeURIComponent(String(start.month || ""))}&sort=default`;
    const html = this._getText(url, {
      "User-Agent": "Mozilla/5.0",
      "Accept": "text/html",
      "Referer": this.baseUrl + "/",
      "Origin": this.baseUrl
    });

    const regex = /<a href="\/watch\/([^"]+)"[^>]+title="([^"]+)"[^>]+data-id="(\d+)"/g;

    const matches = [];
    let m;
    while ((m = regex.exec(html)) !== null) {
      const id = m[3];
      const pageUrl = m[1];
      const title = this._decodeHtml(m[2]);

      const jnameRegex = new RegExp(
        `<h3 class="film-name">[\\s\\S]*?<a[^>]+href="\\/${pageUrl}[^"]*"[^>]+data-jname="([^"]+)"`,
        "i"
      );
      const jnameMatch = html.match(jnameRegex);
      const jname = jnameMatch ? this._decodeHtml(jnameMatch[1]) : "";

      const imageRegex = new RegExp(
        `<a href="/watch/${pageUrl.replace(/\//g, "\\/")}"[\\s\\S]*?<img[^>]+data-src="([^"]+)"`,
        "i"
      );
      const imageMatch = html.match(imageRegex);
      const image = imageMatch ? String(imageMatch[1]) : "";

      matches.push({
        id,
        pageUrl,
        title,
        image,
        normTitleJP: normalize(this.normalizeSeasonParts(jname)),
        normTitle: normalize(this.normalizeSeasonParts(title))
      });
    }

    if (matches.length === 0) return "[]";

    const wantTrack = query.dub ? "dub" : "sub";

    const out = matches.map(x => ({
      id: String(x.id),
      title: String(x.title || ""),
      image: String(x.image || ""),
      url: `${this.baseUrl}/watch/${x.pageUrl}`,
      subOrDub: wantTrack
    }));

    return JSON.stringify(out);
  }

  findEpisodes(animeId) {
    const raw = String(animeId || "").trim();
    if (!raw) return "[]";

    const parts = raw.split("/");
    const id = parts[0];
    const subOrDub = (parts[1] && (parts[1] === "dub" || parts[1] === "sub")) ? parts[1] : "sub";

    const json = this._getJson(`${this.baseUrl}/ajax/v2/episode/list/${encodeURIComponent(id)}`, {
      "X-Requested-With": "XMLHttpRequest"
    });

    const html = this._decodeHtml(String(json.html || json.result || ""));
    const episodes = [];

    const regex = /<a[^>]*class="[^"]*\bep-item\b[^"]*"[^>]*data-number="(\d+)"[^>]*data-id="(\d+)"[^>]*href="([^"]+)"[\s\S]*?<div class="ep-name[^"]*"[^>]*title="([^"]+)"/g;

    let match;
    while ((match = regex.exec(html)) !== null) {
      episodes.push({
        id: `${match[2]}/${subOrDub}`,
        number: parseInt(match[1], 10),
        url: this.baseUrl + match[3],
        title: this._decodeHtml(match[4] || "")
      });
    }

    return JSON.stringify(episodes);
  }

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

    const idParts = String(episode.id || "").split("/");
    const episodeId = idParts[0];
    if (!episodeId) throw new Error("Missing episode id");

    const wantTrack = this._wantTrackFromEpisode(episode);

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

    if (serverName === "HD-4") {
      throw new Error("HD-4 not implemented");
    }

    const serverJson = this._getJson(
      `${this.baseUrl}/ajax/v2/episode/servers?episodeId=${encodeURIComponent(episodeId)}`,
      { "X-Requested-With": "XMLHttpRequest" }
    );

    const serverHtml = this._decodeHtml(String(serverJson.html || serverJson.result || ""));
    if (!serverHtml) throw new Error("Empty server list");

    const esc = (s) => String(s || "").replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
    const strictRe = new RegExp(
      `<div[^>]*class="item\\s+server-item"[^>]*data-type="${esc(wantTrack)}"[^>]*data-id="(\\d+)"[^>]*>[\\s\\S]*?<a[^>]*>[\\s\\S]*?${esc(serverName)}[\\s\\S]*?<\\/a>`,
      "i"
    );

    let m = strictRe.exec(serverHtml);
    let serverId = m ? String(m[1] || "").trim() : "";

    if (!serverId) {
      const trackAnyRe = new RegExp(
        `<div[^>]*class="item\\s+server-item"[^>]*data-type="${esc(wantTrack)}"[^>]*data-id="(\\d+)"`,
        "i"
      );
      m = trackAnyRe.exec(serverHtml);
      serverId = m ? String(m[1] || "").trim() : "";
    }

    if (!serverId) {
      const anyRe = /data-id="(\d+)"/i;
      const mm = anyRe.exec(serverHtml);
      serverId = mm ? String(mm[1] || "").trim() : "";
    }

    if (!serverId) throw new Error(`Server id not found (track=${wantTrack} server=${serverName})`);

    const sourcesJson = this._getJson(
      `${this.baseUrl}/ajax/v2/episode/sources?id=${encodeURIComponent(serverId)}`,
      { "X-Requested-With": "XMLHttpRequest" }
    );

    const embedUrl = sourcesJson && sourcesJson.link ? String(sourcesJson.link) : "";
    if (!embedUrl) throw new Error("No embed link returned");

    let decryptData = null;
    let requiredHeaders = {};

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

    if (!decryptData) {
      decryptData = this._getJson(
        `https://ac-api.ofchaos.com/api/anime/embed/convert/v2?embedUrl=${encodeURIComponent(embedUrl)}`,
        {}
      );
      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 && String(s.type || "").toLowerCase() === "hls" && s.file) ||
      sources.find((s) => s && String(s.type || "").toLowerCase() === "mp4" && s.file) ||
      sources.find((s) => s && s.file);

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

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

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

    return JSON.stringify({
      server: serverName,
      headers: requiredHeaders || {},
      _debug: { scUsed: wantTrack, serverId: serverId },
      videoSources: [{
        url: String(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(
      `${baseDomain}embed-2/v3/e-1/getSources?id=${encodeURIComponent(fileId)}&_k=${encodeURIComponent(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 HiAnime();