/**
 * 插件格式自动检测模块
 * 支持检测: Lx Music / QZV2 / MusicFree 三种插件格式
 */

const PLATFORMS = {
  LX: 'lx',
  QZV2: 'qzv2',
  MUSICFREE: 'musicfree',
  UNKNOWN: 'unknown'
};

const PLATFORM_LABELS = {
  lx: '落雪音乐 (Lx Music)',
  qzv2: '清泽音乐 (QZV2)',
  musicfree: 'MusicFree',
  unknown: '未知格式'
};

/** 所有支持的平台信息（用于前端展示） */
const ALL_PLATFORMS = [
  {
    id: 'lx',
    name: '落雪音乐',
    fullName: 'Lx Music',
    format: 'JavaScript 脚本',
    qualities: ['128k', '192k', '320k', 'flac', 'flac24bit', 'master'],
    features: ['musicUrl', 'lyric', 'pic'],
    sources: ['kw', 'kg', 'tx', 'wy', 'mg', 'local'],
    detectionHints: ['globalThis.lx', 'EVENT_NAMES', '@name 注释头'],
    docUrl: 'https://lxmusic.toside.cn/desktop/custom-source'
  },
  {
    id: 'qzv2',
    name: '清泽音乐',
    fullName: 'QZ Music v2',
    format: 'JS 模块 (ZIP/JS)',
    qualities: ['low', 'standard', 'exhigh', 'high', 'lossless', 'hires', 'master'],
    features: ['search', 'getUrl', 'getLyric', 'getPlaylist', 'getAlbum'],
    sources: ['自定义'],
    detectionHints: ['pluginInfo', 'getUrl', 'supportFunc'],
    docUrl: 'https://music.qz.shiqianjiang.cn/'
  },
  {
    id: 'musicfree',
    name: 'MusicFree',
    fullName: 'MusicFree',
    format: 'CommonJS 模块',
    qualities: ['low', 'standard', 'high', 'super', 'hires', 'master'],
    features: ['search', 'getMediaSource', 'getMusicInfo', 'getLyric', 'getAlbumInfo', 'getMusicSheetInfo', 'getArtistWorks', 'getTopLists', 'getRecommendSheetTags', 'getMusicComments'],
    sources: ['自定义'],
    detectionHints: ['platform:', 'getMediaSource', 'supportedSearchType'],
    docUrl: 'https://musicfree.catcat.work/plugin/protocol.html'
  }
];

/**
 * 检测插件格式
 */
function detectPlatform(code, filename = '') {
  const scores = { lx: 0, qzv2: 0, musicfree: 0 };

  // === Lx Music ===
  if (/\/\*\*[\s\S]*?@name\s+/m.test(code)) scores.lx += 2;
  if (/globalThis\.lx\b/.test(code)) scores.lx += 3;
  if (/EVENT_NAMES/.test(code)) scores.lx += 2;
  if (/send\s*\(\s*EVENT_NAMES\.inited/.test(code)) scores.lx += 3;
  if (/lx\.(request|on|send)\b/.test(code)) scores.lx += 2;
  if (/['"`]128k['"`]|['"`]320k['"`]|['"`]flac24bit['"`]/.test(code)) scores.lx += 1;
  if (/sources\s*:\s*\{/.test(code) && /qualitys/.test(code)) scores.lx += 2;

  // === QZV2 ===
  if (/pluginInfo\s*[:?]/.test(code)) scores.qzv2 += 3;
  if (/getUrl\s*[:(]/.test(code)) scores.qzv2 += 2;
  if (/supportFunc/.test(code)) scores.qzv2 += 2;
  if (/getPlay(list|List)\s*[:(]/.test(code)) scores.qzv2 += 2;
  if (/musicSearch/.test(code)) scores.qzv2 += 2;
  if (/info\s*:\s*\{[\s\S]*?id\s*:/.test(code) && /info\s*:\s*\{[\s\S]*?name\s*:/.test(code)) scores.qzv2 += 1;
  if (/allPage/.test(code)) scores.qzv2 += 1;

  // === MusicFree ===
  if (/platform\s*:\s*["'`]/.test(code)) scores.musicfree += 2;
  if (/getMediaSource\s*[:(]/.test(code)) scores.musicfree += 3;
  if (/getMusicInfo\s*[:(]/.test(code)) scores.musicfree += 2;
  if (/getAlbumInfo|getMusicSheetInfo/.test(code)) scores.musicfree += 2;
  if (/supportedSearchType/.test(code)) scores.musicfree += 2;
  if (/cacheControl/.test(code)) scores.musicfree += 1;
  if (/srcUrl/.test(code)) scores.musicfree += 1;
  if (/primaryKey/.test(code)) scores.musicfree += 1;
  if (/getTopLists|getRecommendSheetTags/.test(code)) scores.musicfree += 2;

  // 排除规则
  if (scores.musicfree >= 3 && scores.qzv2 > 0) {
    if (/getMediaSource/.test(code) && !/pluginInfo/.test(code)) {
      scores.qzv2 = Math.max(0, scores.qzv2 - 2);
    }
  }

  let bestPlatform = PLATFORMS.UNKNOWN;
  let bestScore = 0;
  for (const [platform, score] of Object.entries(scores)) {
    if (score > bestScore) { bestScore = score; bestPlatform = platform; }
  }
  if (bestScore < 2) bestPlatform = PLATFORMS.UNKNOWN;

  const metadata = extractMetadata(code, bestPlatform, filename);
  return { platform: bestPlatform, platformLabel: PLATFORM_LABELS[bestPlatform], metadata, confidence: bestScore, scores };
}

function extractMetadata(code, platform, filename) {
  const metadata = {
    name: '', version: '', author: '', description: '', homepage: '',
    quality: [], features: [], sources: [], apiUrls: []
  };

  const urlMatches = code.match(/https?:\/\/[^\s"'`<>)}\]]+/g) || [];
  metadata.apiUrls = [...new Set(urlMatches)].slice(0, 20);

  if (platform === 'lx') {
    const nameMatch = code.match(/@name\s+(.+)/); if (nameMatch) metadata.name = nameMatch[1].trim();
    const descMatch = code.match(/@description\s+(.+)/); if (descMatch) metadata.description = descMatch[1].trim();
    const versionMatch = code.match(/@version\s+(.+)/); if (versionMatch) metadata.version = versionMatch[1].trim();
    const authorMatch = code.match(/@author\s+(.+)/); if (authorMatch) metadata.author = authorMatch[1].trim();
    const homeMatch = code.match(/@homepage\s+(.+)/); if (homeMatch) metadata.homepage = homeMatch[1].trim();

    const qualitySet = new Set();
    if (/['"`]128k['"`]/.test(code)) qualitySet.add('128k');
    if (/['"`]192k['"`]/.test(code)) qualitySet.add('192k');
    if (/['"`]320k['"`]/.test(code)) qualitySet.add('320k');
    if (/['"`]flac24bit['"`]/.test(code)) qualitySet.add('flac24bit');
    if (/['"`]flac['"`]/.test(code)) qualitySet.add('flac');
    if (/['"`]hires['"`]/.test(code)) qualitySet.add('hires');
    if (/['"`]master['"`]/.test(code)) qualitySet.add('master');
    metadata.quality = [...qualitySet];

    if (/musicUrl/.test(code)) metadata.features.push('musicUrl');
    if (/lyric/.test(code)) metadata.features.push('lyric');
    if (/pic/.test(code)) metadata.features.push('pic');

    const sourcePattern = /\b(kw|kg|tx|wy|mg|local)\b\s*:/g;
    let match; const sourceSet = new Set();
    while ((match = sourcePattern.exec(code)) !== null) sourceSet.add(match[1]);
    metadata.sources = [...sourceSet];

  } else if (platform === 'qzv2') {
    const nameMatch = code.match(/name\s*:\s*["'`]([^"'`]+)["'`]/); if (nameMatch) metadata.name = nameMatch[1];
    const idMatch = code.match(/id\s*:\s*["'`]([^"'`]+)["'`]/); if (idMatch) metadata.description = `ID: ${idMatch[1]}`;
    const descMatch = code.match(/description\s*:\s*["'`]([^"'`]+)["'`]/); if (descMatch) metadata.description = descMatch[1];
    const versionMatch = code.match(/version\s*:\s*["'`]?(["'`]?)([\d.]+)/); if (versionMatch) metadata.version = versionMatch[2];

    const qualityMatch = code.match(/quality\s*:\s*\[([^\]]+)\]/);
    if (qualityMatch) {
      const qItems = qualityMatch[1].match(/["'`]([^"'`]+)["'`]/g);
      if (qItems) metadata.quality = qItems.map(q => q.replace(/["'`]/g, ''));
    }

    const supportFuncMatch = code.match(/supportFunc\s*:\s*\[([^\]]+)\]/);
    if (supportFuncMatch) {
      const fItems = supportFuncMatch[1].match(/["'`]([^"'`]+)["'`]/g);
      if (fItems) metadata.features = fItems.map(f => f.replace(/["'`]/g, ''));
    }
    if (/getUrl/.test(code) && !metadata.features.includes('getUrl')) metadata.features.push('getUrl');
    if (/getLyric/.test(code) && !metadata.features.includes('getLyric')) metadata.features.push('getLyric');
    if (/search/.test(code) && !metadata.features.includes('search')) metadata.features.push('search');

  } else if (platform === 'musicfree') {
    const platformMatch = code.match(/platform\s*:\s*["'`]([^"'`]+)["'`]/); if (platformMatch) metadata.name = platformMatch[1];
    const versionMatch = code.match(/version\s*:\s*["'`]([^"'`]+)["'`]/); if (versionMatch) metadata.version = versionMatch[1];
    const authorMatch = code.match(/author\s*:\s*["'`]([^"'`]+)["'`]/); if (authorMatch) metadata.author = authorMatch[1];
    const srcUrlMatch = code.match(/srcUrl\s*:\s*["'`]([^"'`]+)["'`]/); if (srcUrlMatch) metadata.homepage = srcUrlMatch[1];

    const qualitySet = new Set();
    if (/['"`]low['"`]/.test(code)) qualitySet.add('low');
    if (/['"`]standard['"`]/.test(code)) qualitySet.add('standard');
    if (/['"`]high['"`]/.test(code)) qualitySet.add('high');
    if (/['"`]super['"`]/.test(code)) qualitySet.add('super');
    if (/['"`]hires['"`]/.test(code)) qualitySet.add('hires');
    if (/['"`]master['"`]/.test(code)) qualitySet.add('master');
    metadata.quality = [...qualitySet];

    const featureMap = [
      ['search', 'search'], ['getMediaSource', 'getMediaSource'], ['getMusicInfo', 'getMusicInfo'],
      ['getLyric', 'getLyric'], ['getAlbumInfo', 'getAlbumInfo'], ['getMusicSheetInfo', 'getMusicSheetInfo'],
      ['getArtistWorks', 'getArtistWorks'], ['importMusicItem', 'importMusicItem'],
      ['importMusicSheet', 'importMusicSheet'], ['getTopLists', 'getTopLists'],
      ['getTopListDetail', 'getTopListDetail'], ['getRecommendSheetTags', 'getRecommendSheetTags'],
      ['getRecommendSheetsByTag', 'getRecommendSheetsByTag'], ['getMusicComments', 'getMusicComments']
    ];
    for (const [pattern, label] of featureMap) {
      if (new RegExp(pattern).test(code)) metadata.features.push(label);
    }
  }

  if (!metadata.name && filename) metadata.name = filename.replace(/\.(js|zip)$/i, '');
  return metadata;
}

module.exports = { detectPlatform, PLATFORMS, PLATFORM_LABELS, ALL_PLATFORMS };