class HiAnime {
  constructor() {
    this.type = "anime-streaming";
    this.version = "1.0.5";
    this.baseUrl = "https://hianime.to";
  }

  getSettings() {
    return {
      episodeServers: ["HD-1", "HD-2", "HD-3", "HD-4"],
      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));
  }

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

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

  _decodeHtml(s) {
    const str = this._safeStr(s);
    if (!str) return "";
    return str
      .replace(/&/g, "&")
      .replace(/"/g, '"')
      .replace(/'/g, "'")
      .replace(/&lt;/g, "<")
      .replace(/&gt;/g, ">")
      .replace(/&#(\d+);/g, (_, n) => {
        const code = parseInt(n, 10);
        return isFinite(code) ? String.fromCharCode(code) : "";
      });
  }

  _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 || {};
  }

  _getSubOrDubFromAny(obj) {
    const e = obj || {};
    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] : "";
  }

  _bestTitle(obj) {
    if (!obj) return "";
    const t = obj.title;
    if (typeof t === "string") return t;
    if (t && typeof t === "object") {
      return String(t.english || t.romaji || t.native || t.userPreferred || "");
    }
    return String(obj.name || obj.english || obj.romaji || "");
  }

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

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

    const subOrDub = this._getSubOrDubFromAny(arg);

    const url = `${this.baseUrl}/ajax/search/suggest?keyword=${encodeURIComponent(q)}`;
    const j = this._getJson(url, this._headersJson());

    let results = [];
    if (j && Array.isArray(j.results)) {
      results = j.results
        .map((x) => {
          const title = this._bestTitle(x) || String(x.name || "");
          const u = x.url ? String(x.url) : "";
          const full = u.startsWith("http") ? u : (u ? (this.baseUrl + u) : "");
          const id = x.id ? String(x.id) : this._extractWatchIdFromUrl(full);
          return { id, title, url: full };
        })
        .filter((x) => x.id && x.url);
    }

    if (!results.length) {
      const url2 = `${this.baseUrl}/search?keyword=${encodeURIComponent(q)}`;
      const html = this._getText(url2, this._headersHtml());

      const out = [];
      const re = /href="(\/watch\/[^"]+)"/gi;
      const seen = {};
      let m;
      while ((m = re.exec(html)) !== null) {
        const href = String(m[1] || "");
        const full = href.startsWith("http") ? href : (this.baseUrl + href);
        const id = this._extractWatchIdFromUrl(full);
        if (!id || seen[id]) continue;
        seen[id] = true;
        out.push({ id, title: q, url: full });
        if (out.length >= 20) break;
      }
      results = out;
    }

    const mapped = results.map((r) => ({
      id: `${r.id}/${subOrDub}`,
      title: this._decodeHtml(r.title || ""),
      url: r.url,
      subOrDub
    }));

    return JSON.stringify(mapped);
  }

  findEpisodes(animeId) {
    const parts = String(animeId || "").split("/");
    const id = parts[0];
    const subOrDub = parts[1] || "sub";
    if (!id) return "[]";

    const j = this._getJson(
      `${this.baseUrl}/ajax/v2/episode/list/${encodeURIComponent(id)}`,
      this._headersJson()
    );

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

    const re = /data-number="([^"]+)"[^>]*data-id="([^"]+)"/gi;
    let m;
    while ((m = re.exec(html)) !== null) {
      const numRaw = String(m[1] || "").trim();
      const epId = String(m[2] || "").trim();
      const num = parseFloat(numRaw);
      if (!epId || !isFinite(num)) continue;
      episodes.push({
        id: `${epId}/${subOrDub}`,
        number: num,
        title: "",
        url: ""
      });
    }

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

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

    const epIdRaw = this._safeStr(ep && ep.id ? ep.id : "").trim();
    if (!epIdRaw) throw new Error("Missing episode id");

    const parts = epIdRaw.split("/");
    const epId = parts[0];
    const subOrDub = (parts[1] || "sub").toLowerCase();

    const server = String(serverName || "").trim() || "HD-1";
    if (server === "HD-4") return "null";

    const j = this._getJson(
      `${this.baseUrl}/ajax/v2/episode/servers?episodeId=${encodeURIComponent(epId)}`,
      this._headersJson()
    );

    const html = this._decodeHtml(String(j.html || j.result || ""));

    const escapedServer = server.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
    const reExact = new RegExp(
      `class="item server-item"[^>]*data-type="${subOrDub}"[^>]*data-id="([^"]+)"[^>]*>[\\s\\S]*?>\\s*${escapedServer}\\s*<`,
      "i"
    );
    const mmExact = reExact.exec(html);

    let serverId = mmExact ? String(mmExact[1] || "").trim() : "";

    if (!serverId) {
      const reFirst = new RegExp(`class="item server-item"[^>]*data-type="${subOrDub}"[^>]*data-id="([^"]+)"`, "i");
      const mmFirst = reFirst.exec(html);
      if (mmFirst) serverId = String(mmFirst[1] || "").trim();
    }

    if (!serverId) throw new Error(`No server id found for track=${subOrDub}`);

    const sourcesJson = this._getJson(
      `${this.baseUrl}/ajax/v2/episode/sources?id=${encodeURIComponent(serverId)}`,
      this._headersJson()
    );

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

    let decryptData = null;
    let requiredHeaders = {};

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

    if (!decryptData) {
      const fb = this._getJson(
        `https://ac-api.ofchaos.com/api/anime/embed/convert/v2?embedUrl=${encodeURIComponent(embed)}`,
        { "User-Agent": "Mozilla/5.0", "Accept": "application/json" }
      );
      decryptData = fb || {};
      requiredHeaders = {
        "Referer": "https://megacloud.club/",
        "Origin": "https://megacloud.club",
        "User-Agent": "Mozilla/5.0",
        "X-Requested-With": "XMLHttpRequest"
      };
    }

    const sources = Array.isArray(decryptData.sources) ? decryptData.sources : [];
    const tracks = Array.isArray(decryptData.tracks) ? decryptData.tracks : [];

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

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

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

    const out = {
      server: server,
      headers: requiredHeaders,
      videoSources: [
        {
          url: String(streamSource.file),
          type: String(streamSource.type || "").toLowerCase() === "hls" ? "m3u8" : "mp4",
          quality: "auto",
          subtitles: subtitles
        }
      ]
    };

    return JSON.stringify(out);
  }

  extractMegaCloudSync(embedUrl) {
    const url = new URL(String(embedUrl));
    const baseDomain = `${url.protocol}//${url.host}/`;

    const headers = {
      "Accept": "*/*",
      "X-Requested-With": "XMLHttpRequest",
      "Referer": baseDomain,
      "Origin": `${url.protocol}//${url.host}`,
      "User-Agent": "Mozilla/5.0"
    };

    const html = this._getText(String(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];

    if (!nonce) {
      const match3x16 = [...html.matchAll(/["']([A-Za-z0-9]{16})["']/g)];
      if (match3x16.length >= 3) {
        nonce = match3x16[0][1] + match3x16[1][1] + match3x16[2][1];
      }
    }

    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 = HiAnime;