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);
}

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);
}

// ===== Git音源配置 =====
var GITCODE_CONFIG = { owner: 'ikun_0014', repo: 'music', token: 'WzsER9knWNgC_4tjeJCtHKcN' };
function getGitcodeUrl() {
  return 'https://api.gitcode.com/api/v5/repos/' + GITCODE_CONFIG.owner + '/' + GITCODE_CONFIG.repo + '/raw/audio_database.json?access_token=' + GITCODE_CONFIG.token;
}
var cachedList = null;
var cacheTime = 0;
var CACHE_TTL = 5 * 60 * 1000;

function fetchAllGitMusic() {
  var now = Date.now();
  if (cachedList && now - cacheTime < CACHE_TTL) return Promise.resolve(cachedList);
  return requestUrl(getGitcodeUrl(), 'GET', { 'User-Agent': 'Mozilla/5.0' }).then(function(res) {
    var body = Array.isArray(res.body) ? res.body : [];
    var list = [];
    for (var i = 0; i < body.length; i++) list.push(formatGitItem(body[i]));
    cachedList = list;
    cacheTime = now;
    return list;
  });
}

function formatGitItem(item) {
  var types = [];
  var _types = {};
  var fmt = (item.format || '').toLowerCase();
  if (fmt === 'flac') { types.push({ type: 'flac', size: item.filesize || '' }); _types.flac = { size: item.filesize || '' }; }
  else if (fmt === 'mp3') { types.push({ type: '320k', size: item.filesize || '' }); _types['320k'] = { size: item.filesize || '' }; }
  else { types.push({ type: '128k', size: item.filesize || '' }); _types['128k'] = { size: item.filesize || '' }; }
  return {
    singer: item.artist || '未知歌手',
    name: item.title || item.filename || '',
    albumName: item.album || '未知专辑',
    albumId: '',
    songmid: item.relative_path || '',
    source: 'git',
    interval: '',
    img: item.img || '',
    lrc: item.lyrics || null,
    types: types, _types: _types, typeUrl: {},
    _gitcodeData: item
  };
}

// ===== 搜索实现 =====
function musicSearch(str, page, limit) {
  return fetchAllGitMusic().then(function(list) {
    var regexStr = str.split('').map(function(c) { return c.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); }).join('.*');
    var regex = new RegExp(regexStr, 'i');
    var filtered = [];
    for (var i = 0; i < list.length; i++) {
      var item = list[i];
      if (regex.test(item.singer) || regex.test(item.name) || regex.test(item.albumName)) filtered.push(item);
    }
    var start = (page - 1) * limit;
    return { data: filtered.slice(start, start + limit), total: filtered.length };
  });
}

function handleSearchResult(result) {
  return result.data || [];
}

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) {
    var list = handleSearchResult(result);
    return { list: list, allPage: Math.ceil(result.total / limit), limit: limit, total: result.total, source: 'git' };
  });
}

// ===== 播放链接 =====
function getUrl(songInfo, type) {
  var q = type || '128k';
  var songId = songInfo.songmid || '';
  if (!songId) return Promise.resolve('');
  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=git&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 Promise.resolve('');
}

// ===== 歌词 =====
function getLyric(songInfo) {
  if (songInfo.lrc) return Promise.resolve(songInfo.lrc);
  return Promise.resolve('');
}

// ===== 音乐详情 =====
function musicDetail(songmid) {
  return Promise.resolve(null);
}
function musicInfo(songmid) { return musicDetail(songmid); }

// ===== 热搜 =====
function hotSearch() { return Promise.resolve({ source: 'git', 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: 'git' }); }

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

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

// ===== 插件信息 =====
var pluginInfo = {
  id: 'koneko_ceru_git',
  name: 'GIT音源 - Koneko 聆澜',
  version: '0.0.3',
  source: 'git',
  description: 'GIT音源，基于 CeruMusic musicSdk 搜索 + Ceru 播放接口'
};

module.exports = {
  pluginInfo: pluginInfo,
  musicSearch: { search: search },
  tipSearch: { search: tipSearch },
  hotSearch: { getList: hotSearch },
  leaderboard: { getBoards: leaderboard },
  songList: { search: songList, getTags: function() { return Promise.resolve({ tags: [], hotTag: [], source: 'git' }); }, getList: songList },
  singer: { getInfo: singer, getSongList: singer, getAlbumList: singer },
  album: { getInfo: album, getSongList: album },
  getLyric: getLyric,
  getPic: getPic,
  getUrl: getUrl,
  musicDetail: musicDetail,
  musicInfo: musicInfo
};