/**
 * Koneko 音源测试平台 - 服务器 v3.0
 * 端口: 1255
 * 支持 SSE 实时日志推送
 * 支持 .qz/.zip/.js 文件上传和自动解压
 */

const express = require('express');
const path = require('path');
const fs = require('fs');
const multer = require('multer');
const { testPlugin } = require('./lib/tester');
const { ALL_PLATFORMS, MUSIC_SOURCES } = require('./lib/detector');

const app = express();
const PORT = 1255;

// 文件上传配置
const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 50 * 1024 * 1024 } // 50MB
});

app.use(express.json({ limit: '50mb' }));
app.use(express.urlencoded({ extended: true, limit: '50mb' }));
app.use(express.static(path.join(__dirname, 'public')));

/**
 * 获取所有支持的平台信息
 */
app.get('/api/platforms', (req, res) => {
  res.json({ success: true, platforms: ALL_PLATFORMS, musicSources: MUSIC_SOURCES });
});

/**
 * 文件上传接口
 * 支持 .js / .qz / .zip 文件
 */
app.post('/api/upload', upload.array('files', 20), async (req, res) => {
  try {
    if (!req.files || req.files.length === 0) {
      return res.status(400).json({ error: '未收到文件' });
    }

    const plugins = [];

    for (const file of req.files) {
      const filename = file.originalname;
      const ext = path.extname(filename).toLowerCase();
      const buffer = file.buffer;

      if (ext === '.qz' || ext === '.zip') {
        // 尝试解压 ZIP 文件
        const extracted = extractZipFile(buffer, filename);
        if (extracted.length > 0) {
          for (const item of extracted) {
            plugins.push({
              code: item.code,
              filename: item.filename,
              url: ''
            });
          }
        } else {
          // 解压失败，直接用原始内容
          plugins.push({
            code: buffer.toString('utf-8'),
            filename: filename,
            url: ''
          });
        }
      } else if (ext === '.js') {
        plugins.push({
          code: buffer.toString('utf-8'),
          filename: filename,
          url: ''
        });
      } else {
        // 尝试当作 JS 文件处理
        plugins.push({
          code: buffer.toString('utf-8'),
          filename: filename,
          url: ''
        });
      }
    }

    res.json({ success: true, plugins, count: plugins.length });
  } catch (err) {
    console.error('上传处理出错:', err);
    res.status(500).json({ error: '文件处理失败: ' + err.message });
  }
});

/**
 * 从 ZIP/QZ 文件中提取 JS 文件
 */
function extractZipFile(buffer, originalName) {
  const results = [];
  try {
    const AdmZip = require('adm-zip');
    const zip = new AdmZip(buffer);
    const entries = zip.getEntries();

    for (const entry of entries) {
      if (entry.isDirectory) continue;
      const entryName = entry.entryName;
      if (entryName.endsWith('.js')) {
        const code = entry.getData().toString('utf-8');
        if (code && code.length > 100) { // 过滤太小的文件
          const baseName = path.basename(originalName, path.extname(originalName));
          const jsName = path.basename(entryName);
          results.push({
            code: code,
            filename: `${baseName}/${jsName}`
          });
        }
      }
    }
  } catch (err) {
    console.error('解压失败:', err.message);
    // 尝试用 unzip 命令行
    try {
      const tmpDir = `/tmp/koneko_${Date.now()}`;
      const tmpFile = `${tmpDir}.zip`;
      fs.writeFileSync(tmpFile, buffer);
      const { execSync } = require('child_process');
      fs.mkdirSync(tmpDir, { recursive: true });
      execSync(`unzip -o -q "${tmpFile}" -d "${tmpDir}"`, { timeout: 10000 });

      const files = findJsFiles(tmpDir);
      for (const f of files) {
        const code = fs.readFileSync(f, 'utf-8');
        if (code && code.length > 100) {
          const baseName = path.basename(originalName, path.extname(originalName));
          const jsName = path.basename(f);
          results.push({ code, filename: `${baseName}/${jsName}` });
        }
      }

      // 清理临时文件
      fs.unlinkSync(tmpFile);
      fs.rmSync(tmpDir, { recursive: true, force: true });
    } catch (err2) {
      console.error('命令行解压也失败:', err2.message);
    }
  }
  return results;
}

function findJsFiles(dir) {
  let results = [];
  const items = fs.readdirSync(dir);
  for (const item of items) {
    const fullPath = path.join(dir, item);
    const stat = fs.statSync(fullPath);
    if (stat.isDirectory()) {
      results = results.concat(findJsFiles(fullPath));
    } else if (item.endsWith('.js')) {
      results.push(fullPath);
    }
  }
  return results;
}

/**
 * SSE 流式测试接口
 * POST /api/test/stream
 * body: { plugins: [{ url, code, filename }] }
 * 返回: text/event-stream
 */
app.post('/api/test/stream', async (req, res) => {
  try {
    const { plugins } = req.body;
    if (!plugins || !Array.isArray(plugins) || plugins.length === 0) {
      return res.status(400).json({ error: '请提供至少一个插件链接或文件' });
    }
    if (plugins.length > 50) {
      return res.status(400).json({ error: '单次最多测试 50 个插件' });
    }

    // SSE headers
    res.writeHead(200, {
      'Content-Type': 'text/event-stream',
      'Cache-Control': 'no-cache',
      'Connection': 'keep-alive',
      'X-Accel-Buffering': 'no',
      'Access-Control-Allow-Origin': '*'
    });

    const send = (event, data) => {
      res.write(`event: ${event}\n`);
      res.write(`data: ${JSON.stringify(data)}\n\n`);
    };

    send('start', { total: plugins.length, time: new Date().toISOString() });

    const concurrencyLimit = 3;
    let completed = 0;

    for (let i = 0; i < plugins.length; i += concurrencyLimit) {
      const batch = plugins.slice(i, i + concurrencyLimit);
      const batchResults = await Promise.all(
        batch.map(async (p, batchIdx) => {
          const globalIdx = i + batchIdx;
          send('plugin_start', { index: globalIdx, url: p.url || '', filename: p.filename || '' });

          const logger = (level, message, data) => {
            send('log', {
              index: globalIdx,
              level,
              message,
              data: data || null,
              time: new Date().toISOString()
            });
          };

          try {
            const result = await testPlugin(p.url || '', p.code || null, p.filename || '', logger);
            send('plugin_done', { index: globalIdx, result });
            return result;
          } catch (err) {
            const errorResult = {
              url: p.url || p.filename, filename: p.filename || '',
              platform: 'unknown', platformLabel: '未知格式',
              metadata: {}, downloadInfo: { success: false, error: err.message },
              latencyTests: [], qualityTests: [], overallStatus: 'failed',
              summary: { score: 0, details: { error: err.message } },
              testedAt: new Date().toISOString()
            };
            send('log', { index: globalIdx, level: 'error', message: `测试异常: ${err.message}`, time: new Date().toISOString() });
            send('plugin_done', { index: globalIdx, result: errorResult });
            return errorResult;
          }
        })
      );

      completed += batchResults.length;
      send('progress', { completed, total: plugins.length, percent: Math.round((completed / plugins.length) * 100) });
    }

    send('done', { total: plugins.length, time: new Date().toISOString() });
    res.end();
  } catch (err) {
    console.error('测试出错:', err);
    if (!res.headersSent) {
      res.status(500).json({ error: '服务器内部错误: ' + err.message });
    } else {
      res.end();
    }
  }
});

/**
 * 兼容旧接口 - 批量测试（非流式）
 */
app.post('/api/test', async (req, res) => {
  try {
    const { plugins } = req.body;
    if (!plugins || !Array.isArray(plugins) || plugins.length === 0) {
      return res.status(400).json({ error: '请提供至少一个插件链接或文件' });
    }
    const results = [];
    const concurrencyLimit = 5;
    for (let i = 0; i < plugins.length; i += concurrencyLimit) {
      const batch = plugins.slice(i, i + concurrencyLimit);
      const batchResults = await Promise.all(
        batch.map(p => testPlugin(p.url || '', p.code || null, p.filename || '').catch(err => ({
          url: p.url || p.filename, filename: p.filename || '', platform: 'unknown',
          platformLabel: '未知格式', metadata: {}, downloadInfo: { success: false, error: err.message },
          latencyTests: [], qualityTests: [], overallStatus: 'failed',
          summary: { score: 0, details: { error: err.message } }, testedAt: new Date().toISOString()
        })))
      );
      results.push(...batchResults);
    }
    res.json({ success: true, count: results.length, results, testedAt: new Date().toISOString() });
  } catch (err) {
    res.status(500).json({ error: '服务器内部错误: ' + err.message });
  }
});

/**
 * 导出 Markdown 表格
 */
app.post('/api/export/md', (req, res) => {
  try {
    const { results } = req.body;
    if (!results || !Array.isArray(results)) return res.status(400).json({ error: '无效的测试结果' });
    res.json({ success: true, markdown: generateMarkdownTable(results) });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

app.get('/api/health', (req, res) => {
  res.json({ status: 'ok', service: 'Koneko 音源测试平台', version: '3.0.0', time: new Date().toISOString() });
});

function generateMarkdownTable(results) {
  const lines = [];
  lines.push('# Koneko 音源测试平台 - 测试报告');
  lines.push('');
  lines.push(`> 测试时间: ${new Date().toLocaleString('zh-CN')}`);
  lines.push(`> 测试数量: ${results.length}`);
  lines.push('');
  lines.push('## 测试概览');
  lines.push('');
  lines.push('| # | 插件名称 | 音乐平台 | 插件格式 | 版本 | 音质 | QZ API | 平均延时(ms) | 成功率 | 评分 | 等级 | 状态 |');
  lines.push('|---|---------|---------|---------|------|------|--------|------------|--------|------|------|------|');
  results.forEach((r, i) => {
    const name = r.metadata?.name || r.filename || r.url || '未知';
    const musicPlatform = r.metadata?.musicPlatformName || '未知';
    const platform = r.platform === 'unknown' ? '未知' : r.platform.toUpperCase();
    const version = r.metadata?.version || '-';
    const quality = (r.qualityTests?.map(q => q.quality).join(', ')) || '-';
    const qzApi = r.summary?.details?.qzApiStatus ? 'OK' : (r.metadata?.qzApiEndpoint?.apiUrl ? '不通' : 'N/A');
    const avgLatency = r.summary?.details?.avgLatency ?? '-';
    const successRate = r.summary?.details?.successRate ?? '-';
    const score = r.summary?.score ?? 0;
    const grade = r.summary?.details?.grade ?? '-';
    const status = r.overallStatus === 'passed' ? '通过' : (r.overallStatus === 'warning' ? '警告' : '失败');
    lines.push(`| ${i + 1} | ${name} | ${musicPlatform} | ${platform} | ${version} | ${quality} | ${qzApi} | ${avgLatency} | ${successRate} | ${score} | ${grade} | ${status} |`);
  });
  lines.push('');
  lines.push('## 详细信息');
  lines.push('');
  results.forEach((r, i) => {
    const name = r.metadata?.name || r.filename || r.url || '未知';
    lines.push(`### ${i + 1}. ${name}`);
    lines.push('');
    lines.push(`- **插件链接**: ${r.url || '文件上传'}`);
    lines.push(`- **音乐平台**: ${r.metadata?.musicPlatformName || '未知'} (${r.metadata?.musicPlatform || 'N/A'})`);
    lines.push(`- **插件格式**: ${r.platformLabel}`);
    if (r.metadata?.isObfuscated) lines.push(`- **混淆代码**: 是`);
    lines.push(`- **版本**: ${r.metadata?.version || '未指定'}`);
    lines.push(`- **作者**: ${r.metadata?.author || '未知'}`);
    lines.push(`- **描述**: ${r.metadata?.description || '无'}`);
    if (r.metadata?.qzApiEndpoint?.apiUrl) {
      lines.push(`- **QZ API 端点**: ${r.metadata.qzApiEndpoint.apiUrl}`);
      if (r.metadata.qzApiEndpoint.apiKey) lines.push(`- **API Key**: ${r.metadata.qzApiEndpoint.apiKey.substring(0, 8)}...`);
    }
    lines.push(`- **音质支持**: ${r.qualityTests?.map(q => `${q.quality}(${q.label || ''})${q.tested ? `[${q.testStatus === 'pass' ? 'PASS' : 'FAIL'}]` : ''}`).join(', ') || '无'}`);
    lines.push(`- **音质通过率**: ${r.summary?.details?.qualityPassRate || '0/0'}`);
    lines.push(`- **功能列表**: ${r.metadata?.features?.join(', ') || '无'}`);
    lines.push(`- **评分**: ${r.summary?.score || 0}/100 (${r.summary?.details?.grade || 'D'})`);
    lines.push('');
    if (r.latencyTests?.length > 0) {
      lines.push('#### 延时测试');
      lines.push('');
      lines.push('| 端点 | 类型 | 状态码 | 延时(ms) | 状态 |');
      lines.push('|------|------|--------|---------|------|');
      for (const t of r.latencyTests) {
        const status = t.success ? '成功' : `失败(${t.error || ''})`;
        const type = t.isQzApi ? (t.quality === 'basic' ? 'QZ API' : `QZ-${t.quality}`) : (t.isPluginUrl ? '插件源' : '直连');
        const displayUrl = t.url.length > 60 ? t.url.substring(0, 57) + '...' : t.url;
        lines.push(`| ${displayUrl} | ${type} | ${t.status} | ${t.latency} | ${status} |`);
      }
      lines.push('');
    }
    lines.push('---');
    lines.push('');
  });
  return lines.join('\n');
}

app.listen(PORT, '0.0.0.0', () => {
  console.log(`Koneko 音源测试平台 v3.0 已启动`);
  console.log(`服务地址: http://0.0.0.0:${PORT}`);
  console.log(`测试时间: ${new Date().toLocaleString('zh-CN')}`);
});