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);
}

// ===== 网易云eapi加密 =====
var EAPI_KEY = 'e82ckenh8dichen8';
function aesEncryptEapi(text) {
  var cipher = crypto.createCipheriv('aes-128-ecb', EAPI_KEY, '');
  var encrypted = cipher.update(text, 'utf8', 'base64');
  encrypted += cipher.final('base64');
  return encrypted;
}
function eapi(url, params) {
  var payload = JSON.stringify({
    method: 'POST',
    url: url,
    params: params
  });
  return { params: aesEncryptEapi(payload) };
}

// ===== weapi加密（简化版，用于歌词等） =====
var WEAPI_IV = '0102030405060708';
var WEAPI_PRESET_KEY = '0CoJUm6Qyw8W8jud';
var WEAPI_RSA_PUBKEY = '010001';
var WEAPI_RSA_MODULUS = '00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7';
function aesEncryptWeapi(text, key) {
  var cipher = crypto.createCipheriv('aes-128-cbc', key, WEAPI_IV);
  var encrypted = cipher.update(text, 'utf8', 'base64');
  encrypted += cipher.final('base64');
  return encrypted;
}
function rsaEncryptWeapi(text) {
  var reversed = text.split('').reverse().join('');
  var input = Buffer.from(reversed, 'utf8').toString('hex');
  var bigInput = BigInt('0x' + input);
  var bigExp = BigInt('0x' + WEAPI_RSA_PUBKEY);
  var bigMod = BigInt('0x' + WEAPI_RSA_MODULUS);
  var bigResult = 1n;
  var e = bigExp;
  var b = bigInput;
  while (e > 0n) {
    if (e % 2n === 1n) bigResult = (bigResult * b) % bigMod;
    b = (b * b) % bigMod;
    e = e / 2n;
  }
  var result = bigResult.toString(16).padStart(256, '0');
  return result;
}
function weapi(params) {
  var text = JSON.stringify(params);
  var secretKey = '';
  for (var i = 0; i < 16; i++) secretKey += String.fromCharCode(97 + Math.floor(Math.random() * 25));
  var encrypted = aesEncryptWeapi(aesEncryptWeapi(text, WEAPI_PRESET_KEY), secretKey);
  var encSecKey = rsaEncryptWeapi(secretKey);
  return { params: encrypted, encSecKey: encSecKey };
}

// ===== 格式化辅助 =====
function formatPlayTime(seconds) {
  var m = Math.floor(seconds / 60);
  var s = Math.floor(seconds % 60);
  return (m < 10 ? '0' + m : m) + ':' + (s < 10 ? '0' + s : s);
}

function formatSingerName(arr, key) {
  if (!arr || !arr.length) return '';
  var names = [];
  for (var i = 0; i < arr.length; i++) names.push(arr[i][key] || arr[i]);
  return names.join('、');
}

// ===== 搜索实现 =====
function musicSearch(str, page, limit) {
  var form = eapi('/api/search/song/list/page', {
    keyword: str,
    needCorrect: '1',
    channel: 'typing',
    offset: limit * (page - 1),
    scene: 'normal',
    total: page == 1,
    limit: limit
  });
  return requestUrl('http://interface3.music.163.com/eapi/search/song/list/page', 'POST', {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36',
    'Origin': 'https://music.163.com',
    'Content-Type': 'application/x-www-form-urlencoded'
  }, querystring.stringify(form)).then(function(res) {
    return res.body;
  });
}

function handleSearchResult(rawList) {
  if (!rawList) return [];
  var list = [];
  for (var i = 0; i < rawList.length; i++) {
    var item = rawList[i];
    if (!item.baseInfo || !item.baseInfo.simpleSongData) continue;
    var s = item.baseInfo.simpleSongData;
    var types = [];
    var _types = {};
    if (s.h && s.h.br >= 320000) { types.push({ type: '320k', size: '' }); _types['320k'] = { size: '' }; }
    else if (s.m && s.m.br >= 192000) { types.push({ type: '192k', size: '' }); _types['192k'] = { size: '' }; }
    else if (s.l) { types.push({ type: '128k', size: '' }); _types['128k'] = { size: '' }; }
    if (s.sq) { types.push({ type: 'flac', size: '' }); _types.flac = { size: '' }; }
    if (s.hr) { types.push({ type: 'hires', size: '' }); _types.hires = { size: '' }; }
    list.push({
      singer: formatSingerName(s.ar, 'name'),
      name: s.name,
      albumName: s.al && s.al.name ? s.al.name : '',
      albumId: s.al && s.al.id ? s.al.id : '',
      source: 'wy',
      interval: formatPlayTime((s.dt || 0) / 1000),
      songmid: s.id,
      img: s.al && s.al.picUrl ? s.al.picUrl : '',
      lrc: null,
      types: types,
      _types: _types,
      typeUrl: {}
    });
  }
  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(result) {
    if (!result || result.code !== 200) return search(str, page, limit, retryNum);
    var list = handleSearchResult(result.data && result.data.resources ? result.data.resources : []);
    if (!list || list.length === 0) return search(str, page, limit, retryNum);
    var total = result.data && result.data.totalCount ? result.data.totalCount : 0;
    return {
      list: list,
      allPage: Math.ceil(total / limit),
      limit: limit,
      total: total,
      source: 'wy'
    };
  });
}

// ===== 播放链接 =====
function getUrl(songInfo, type) {
  var q = type || '128k';
  var songId = songInfo.songmid || 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=wy&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.img) return Promise.resolve(songInfo.img);
  return requestUrl('https://music.163.com/weapi/v3/song/detail', 'POST', {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36',
    'Referer': 'https://music.163.com/song?id=' + songInfo.songmid,
    'Origin': 'https://music.163.com',
    'Content-Type': 'application/x-www-form-urlencoded'
  }, querystring.stringify(weapi({ c: '[{"id":' + songInfo.songmid + '}]', ids: '[' + songInfo.songmid + ']' })))
    .then(function(res) {
      if (res.body && res.body.songs && res.body.songs.length) return res.body.songs[0].al.picUrl;
      return '';
    })
    .catch(function() { return ''; });
}

// ===== 歌词 =====
function getLyric(songInfo) {
  var songmid = songInfo.songmid || '';
  return requestUrl('https://music.163.com/api/song/lyric?id=' + songmid + '&lv=1&kv=1&tv=-1', 'GET', {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36',
    'Referer': 'https://music.163.com/song?id=' + songmid
  }).then(function(res) {
    if (res.body && res.body.lrc && res.body.lrc.lyric) return res.body.lrc.lyric;
    return '';
  }).catch(function() { return ''; });
}

// ===== 音乐详情 =====
function musicDetail(songmid) {
  return requestUrl('https://music.163.com/weapi/v3/song/detail', 'POST', {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36',
    'Origin': 'https://music.163.com',
    'Content-Type': 'application/x-www-form-urlencoded'
  }, querystring.stringify(weapi({ c: '[{"id":' + songmid + '}]', ids: '[' + songmid + ']' })))
    .then(function(res) {
      if (res.body && res.body.songs && res.body.songs.length) {
        var s = res.body.songs[0];
        return {
          singer: formatSingerName(s.ar, 'name'),
          name: s.name,
          albumName: s.al && s.al.name ? s.al.name : '',
          albumId: s.al && s.al.id ? s.al.id : '',
          source: 'wy',
          interval: formatPlayTime((s.dt || 0) / 1000),
          songmid: s.id,
          img: s.al && s.al.picUrl ? s.al.picUrl : '',
          lrc: null,
          types: [],
          _types: {},
          typeUrl: {}
        };
      }
      return null;
    })
    .catch(function() { return null; });
}

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

// ===== 热搜 =====
function hotSearch() {
  return requestUrl('https://music.163.com/weapi/search/hot', 'POST', {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36',
    'Origin': 'https://music.163.com',
    'Content-Type': 'application/x-www-form-urlencoded'
  }, querystring.stringify(weapi({ type: 1111 })))
    .then(function(res) {
      var list = [];
      if (res.body && res.body.result && res.body.result.hots) {
        for (var i = 0; i < res.body.result.hots.length; i++) list.push(res.body.result.hots[i].first);
      }
      return { source: 'wy', list: list };
    })
    .catch(function() { return { source: 'wy', list: [] }; });
}

// ===== 搜索建议 =====
function tipSearch(str) {
  return requestUrl('https://music.163.com/weapi/search/suggest/web', 'POST', {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36',
    'Origin': 'https://music.163.com',
    'Content-Type': 'application/x-www-form-urlencoded'
  }, querystring.stringify(weapi({ s: str, limit: 10 })))
    .then(function(res) {
      var result = { order: [], songs: [], artists: [], albums: [], playlists: [] };
      if (res.body && res.body.result) {
        var r = res.body.result;
        if (r.songs) { result.order.push('songs'); result.songs = r.songs.map(function(s) { return { name: s.name, id: s.id, source: 'wy' }; }); }
        if (r.artists) { result.order.push('artists'); result.artists = r.artists.map(function(a) { return { name: a.name, id: a.id, source: 'wy' }; }); }
      }
      return result;
    })
    .catch(function() { return { 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: 'wy' });
}

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

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

// ===== 插件信息 =====
module.exports = {
  info: { id: 'koneko_ceru_wy', name: '网易云音乐 - Koneko 聆澜', version: '0.0.3', source: 'wy', description: '网易云音乐音源，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: ['musicSearch', 'tipSearch', 'hotSearch', 'leaderboard', 'songList', 'singer', 'album', 'getLyric', 'getPic', 'getUrl', 'musicDetail', 'musicInfo'],
  musicSearch: { search: search },
  tipSearch: { search: tipSearch },
  hotSearch: { getList: hotSearch },
  leaderboard: { getBoards: leaderboard },
  songList: { search: songList, getTags: function() { return Promise.resolve({ tags: [], hotTag: [], source: 'wy' }); }, getList: songList },
  singer: { getInfo: singer, getSongList: singer, getAlbumList: singer },
  album: { getInfo: album, getSongList: album },
  getLyric: getLyric,
  getPic: getPic,
  getUrl: getUrl,
  musicDetail: musicDetail,
  musicInfo: musicInfo
};