var https = require('https');
var http = require('http');
var crypto = require('crypto');
var querystring = require('querystring');

// ===== 通用HTTP请求 =====
function doRequest(protocol, options, postData) {
  return new Promise(function(resolve, reject) {
    var client = protocol === 'https' ? https : http;
    var req = client.request(options, function(res) {
      var chunks = [];
      res.on('data', function(chunk) { chunks.push(chunk); });
      res.on('end', function() {
        var buf = Buffer.concat(chunks);
        var body;
        try {
          body = JSON.parse(buf.toString('utf8'));
        } catch (e) {
          body = buf.toString('utf8');
        }
        resolve({ body: body, statusCode: res.statusCode, headers: res.headers });
      });
    });
    req.on('error', function(err) { reject(err); });
    req.setTimeout(15000, function() { req.destroy(); reject(new Error('timeout')); });
    if (postData) req.write(postData);
    req.end();
  });
}

function requestUrl(urlStr, method, headers, body) {
  var parsed = new URL(urlStr);
  var protocol = parsed.protocol.replace(':', '');
  var options = {
    hostname: parsed.hostname,
    port: parsed.port || (protocol === 'https' ? 443 : 80),
    path: parsed.pathname + parsed.search,
    method: method || 'GET',
    headers: headers || {}
  };
  var postData = null;
  if (body) {
    if (typeof body === 'string') {
      postData = Buffer.from(body, 'utf8');
    } else if (Buffer.isBuffer(body)) {
      postData = body;
    } else {
      postData = Buffer.from(JSON.stringify(body), 'utf8');
      if (!options.headers['Content-Type']) options.headers['Content-Type'] = 'application/json';
    }
    if (postData) options.headers['Content-Length'] = postData.length;
  }
  return doRequest(protocol, options, postData);
}

// ===== QQ音乐zzcSign =====
var PART_1_INDEXES = [23, 14, 6, 36, 16, 40, 7, 19];
var PART_2_INDEXES = [16, 1, 32, 12, 19, 27, 8, 5];
var SCRAMBLE_VALUES = [89, 39, 179, 150, 218, 82, 58, 252, 177, 52, 186, 123, 120, 64, 242, 133, 143, 161, 121, 179];
function hashSHA1(text) {
  return crypto.createHash('sha1').update(Buffer.from(text, 'utf-8')).digest().toString('hex').toUpperCase();
}
function pickHashByIdx(hash, indexes) {
  var out = '';
  for (var i = 0; i < indexes.length; i++) out += hash[indexes[i]];
  return out;
}
function base64Encode(data) {
  var buf;
  if (typeof data === 'string') buf = Buffer.from(data);
  else if (Array.isArray(data)) buf = Buffer.from(data);
  else buf = data;
  return buf.toString('base64').replace(/[\\/+=]/g, '');
}
function zzcSign(text) {
  var hash = hashSHA1(text);
  var part1 = pickHashByIdx(hash, PART_1_INDEXES);
  var part2 = pickHashByIdx(hash, PART_2_INDEXES);
  var part3 = [];
  for (var i = 0; i < SCRAMBLE_VALUES.length; i++) {
    part3.push(SCRAMBLE_VALUES[i] ^ parseInt(hash.slice(i * 2, i * 2 + 2), 16));
  }
  var b64Part = base64Encode(part3).replace(/[\\/+=]/g, '');
  return ('zzc' + part1 + b64Part + part2).toLowerCase();
}
function randomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}
function getSearchId() {
  var e = randomInt(1, 20);
  var t = Number(e * Number('18014398509481984').toFixed());
  var n = randomInt(0, 4194304) * 4294967296;
  var a = Date.now();
  var r = Math.round(a * 1000) % (24 * 60 * 60 * 1000);
  return String(t + n + r);
}
function signRequest(data) {
  var sign = zzcSign(JSON.stringify(data));
  return requestUrl('https://u.y.qq.com/cgi-bin/musics.fcg?sign=' + encodeURIComponent(sign), 'POST', {
    'User-Agent': 'QQMusic 14090508(android 12)',
    'Content-Type': 'application/json'
  }, JSON.stringify(data));
}

function formatPlayTime(seconds) {
  if (!seconds) return '00:00';
  var m = Math.floor(seconds / 60);
  var s = Math.floor(seconds % 60);
  return (m < 10 ? '0' + m : m) + ':' + (s < 10 ? '0' + s : s);
}

// ===== 搜索实现 =====
function musicSearch(str, page, limit) {
  var body = {
    comm: { ct: '11', cv: '14090508', v: '14090508', tmeAppID: 'qqmusic', phonetype: 'EBG-AN10', deviceScore: '553.47', devicelevel: '50', newdevicelevel: '20', rom: 'HuaWei/EMOTION/EmotionUI_14.2.0', os_ver: '12', OpenUDID: '0', OpenUDID2: '0', QIMEI36: '0', udid: '0', chid: '0', aid: '0', oaid: '0', taid: '0', tid: '0', wid: '0', uid: '0', sid: '0', modeSwitch: '6', teenMode: '0', ui_mode: '2', nettype: '1020', v4ip: '' },
    req: { module: 'music.search.SearchCgiService', method: 'DoSearchForQQMusicMobile', param: { search_type: 0, searchid: getSearchId(), query: str, page_num: page, num_per_page: limit, highlight: 0, nqc_flag: 0, multi_zhida: 0, cat: 2, grp: 1, sin: 0, sem: 0 } }
  };
  return signRequest(body).then(function(res) {
    if (res.body && res.body.code === 0 && res.body.req && res.body.req.code === 0) return res.body.req.data;
    throw new Error('tx search failed');
  });
}

function handleSearchResult(rawList) {
  var list = [];
  for (var i = 0; i < rawList.length; i++) {
    var item = rawList[i];
    if (!item.file || !item.file.media_mid) continue;
    var qualities = {};
    if (item.file.size_128mp3) qualities.standard = String(item.file.size_128mp3);
    if (item.file.size_320mp3) qualities.exhigh = String(item.file.size_320mp3);
    if (item.file.size_flac) qualities.lossless = String(item.file.size_flac);
    if (item.file.size_hires) qualities.hires = String(item.file.size_hires);
    var albumId = '';
    var albumName = '';
    if (item.album) { albumName = item.album.name; albumId = item.album.mid; }
    var singerName = '';
    if (item.singer && item.singer.length) {
      var ns = [];
      for (var j = 0; j < item.singer.length; j++) ns.push(item.singer[j].name);
      singerName = ns.join('、');
    }
    var picUrl = albumId ? 'https://y.gtimg.cn/music/photo_new/T002R500x500M000' + albumId + '.jpg' : (item.singer && item.singer.length ? 'https://y.gtimg.cn/music/photo_new/T001R500x500M000' + item.singer[0].mid + '.jpg' : '');
    list.push({
      id: item.mid,
      name: item.name + (item.title_extra || ''),
      artists: singerName,
      source: 'tx',
      pic: picUrl,
      mPic: picUrl,
      sPic: picUrl,
      albumName: albumName,
      albumId: albumId,
      interval: formatPlayTime(item.interval),
      qualities: qualities
    });
  }
  return list;
}

function search(str, page, limit, retryNum) {
  if (retryNum === undefined) retryNum = 0;
  if (++retryNum > 3) return Promise.reject(new Error('try max num'));
  if (!limit) limit = 30;
  return musicSearch(str, page, limit).then(function(data) {
    if (!data || !data.body || !data.body.item_song) return search(str, page, limit, retryNum);
    var list = handleSearchResult(data.body.item_song);
    var meta = data.meta || {};
    var total = meta.estimate_sum || 0;
    return { list: list, allPage: Math.ceil(total / limit), limit: limit, total: total, source: 'tx' };
  });
}

// ===== 播放链接 =====
function getUrl(songInfo, type) {
  var q = type || '128k';
  var songId = songInfo.id || '';
  var ceruKey = process.env.ceru_key || '';
  var headers = { 'User-Agent': 'QZMusic/2.0' };
  if (ceruKey) headers['X-API-Key'] = ceruKey;
  return requestUrl('https://source.shiqianjiang.cn/api/music/url?source=tx&songId=' + encodeURIComponent(songId) + '&quality=' + encodeURIComponent(q), 'GET', headers)
    .then(function(res) {
      if (res.body && typeof res.body === 'object' && res.body.url) return res.body.url;
      if (res.body && typeof res.body === 'object' && res.body.data && res.body.data.url) return res.body.data.url;
      if (typeof res.body === 'string' && res.body.indexOf('http') === 0) return res.body;
      return '';
    }).catch(function() { return ''; });
}

// ===== 封面图 =====
function getPic(songInfo) {
  if (songInfo.pic) return Promise.resolve(songInfo.pic);
  var albumId = songInfo.albumId || '';
  if (albumId) return Promise.resolve('https://y.gtimg.cn/music/photo_new/T002R500x500M000' + albumId + '.jpg');
  return Promise.resolve('');
}

// ===== 歌词 =====
function getLyric(songInfo) {
  var songmid = songInfo.id || '';
  return requestUrl('https://c.y.qq.com/lyric/fcgi-bin/fcg_query_lyric_new.fcg?format=json&nobase64=1&songmid=' + encodeURIComponent(songmid), 'GET', {
    'User-Agent': 'Mozilla/5.0 (Linux; Android 10)',
    'Referer': 'https://y.qq.com/portal/player.html'
  }).then(function(res) {
    if (typeof res.body === 'string') {
      try { var obj = JSON.parse(res.body.replace(/^MusicJsonCallback\(/, '').replace(/\)$/, '')); return obj.lyric || ''; } catch(e) {}
    }
    if (res.body && res.body.lyric) return res.body.lyric;
    return '';
  }).catch(function() { return ''; });
}

// ===== 音乐详情 =====
function musicDetail(songmid) {
  var data = {
    comm: { ct: '11', cv: '14090508', v: '14090508', tmeAppID: 'qqmusic' },
    req: { module: 'music.pf_song_detail_svr', method: 'get_song_detail_yqq', param: { song_mid: songmid } }
  };
  return signRequest(data).then(function(res) {
    if (res.body && res.body.req && res.body.req.data && res.body.req.data.info && res.body.req.data.info.track_info) {
      var t = res.body.req.data.info.track_info;
      var albumId = t.album ? t.album.mid : '';
      var singerName = '';
      if (t.singer && t.singer.length) { var ns = []; for (var j = 0; j < t.singer.length; j++) ns.push(t.singer[j].name); singerName = ns.join('、'); }
      var picUrl = albumId ? 'https://y.gtimg.cn/music/photo_new/T002R500x500M000' + albumId + '.jpg' : '';
      return {
        id: t.mid,
        name: t.name,
        artists: singerName,
        source: 'tx',
        pic: picUrl,
        mPic: picUrl,
        sPic: picUrl,
        albumName: t.album ? t.album.name : '',
        albumId: albumId,
        interval: formatPlayTime(t.interval),
        qualities: {}
      };
    }
    return null;
  }).catch(function() { return null; });
}

function musicInfo(songmid) { return musicDetail(songmid); }

// ===== 热搜 =====
function hotSearch() {
  var data = {
    comm: { ct: '19', cv: '1803', guid: '0', patch: '118', psrf_access_token_expiresAt: 0, psrf_qqaccess_token: '', psrf_qqopenid: '', psrf_qqunionid: '', tmeAppID: 'qqmusic', tmeLoginType: 0, uin: '0', wid: '0' },
    hotkey: { method: 'GetHotkeyForQQMusicPC', module: 'tencent_musicsoso_hotkey.HotkeyService', param: { search_id: '', uin: 0 } }
  };
  return requestUrl('https://u.y.qq.com/cgi-bin/musicu.fcg', 'POST', {
    'User-Agent': 'Mozilla/5.0 (Linux; Android 10)',
    'Referer': 'https://y.qq.com/portal/player.html',
    'Content-Type': 'application/json'
  }, JSON.stringify(data)).then(function(res) {
    var list = [];
    if (res.body && res.body.hotkey && res.body.hotkey.data && res.body.hotkey.data.vec_hotkey) {
      var arr = res.body.hotkey.data.vec_hotkey;
      for (var i = 0; i < arr.length; i++) list.push(arr[i].query);
    }
    return { source: 'tx', list: list };
  }).catch(function() { return { source: 'tx', list: [] }; });
}

// ===== 搜索建议 =====
function tipSearch(str) {
  return Promise.resolve({ order: [], songs: [], artists: [], albums: [], playlists: [] });
}

// ===== 榜单 =====
function leaderboard() {
  return Promise.resolve([]);
}

// ===== 歌单 =====
function songList() {
  return Promise.resolve({ list: [], total: 0, page: 1, source: 'tx' });
}

// ===== 歌手 =====
function singer() {
  return Promise.resolve({ source: 'tx', list: [], total: 0 });
}

// ===== 专辑 =====
function album() {
  return Promise.resolve({ source: 'tx', list: [], total: 0 });
}

// ===== 插件信息 =====
var pluginInfo = {
  info: {
    id: 'koneko_ceru_tx',
    name: 'QQ音乐 - Koneko 聆澜',
    version: '0.0.3',
    source: 'tx',
    description: 'QQ音乐音源，基于 CeruMusic musicSdk 搜索 + Ceru 播放接口'
  },
  ext: [],
  env: [{ key: 'ceru_key', name: 'Ceru API Key', description: '聆澜播放接口密钥' }],
  quality: [
    { name: '标准', ui: '标', id: '128k' },
    { name: '高品', ui: 'HQ', id: '320k' },
    { name: '无损', ui: 'SQ', id: 'flac' }
  ],
  supportFunc: []
}

module.exports = {
  musicSearch: { search: search },
  tipSearch: { search: tipSearch },
  hotSearch: { getList: hotSearch },
  leaderboard: { getBoards: leaderboard },
  songList: songList,
  artists: singer,
  album: album,
  getLyric: getLyric,
  getPic: getPic,
  getUrl: getUrl,
  musicDetail: musicDetail,
  musicInfo: musicInfo,
  pluginInfo: pluginInfo
};