// 内存监控工具
const MemoryMonitor = (() => {
  let monitorInterval = null;
  let isMonitoring = false;
  
  const formatBytes = (bytes) => {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return (bytes / Math.pow(k, i)).toFixed(2) + ' ' + sizes[i];
  };
  
  const getMemoryInfo = () => {
    if (performance.memory) {
      return {
        used: performance.memory.usedJSHeapSize,
        total: performance.memory.totalJSHeapSize,
        limit: performance.memory.jsHeapSizeLimit,
        usedFormatted: formatBytes(performance.memory.usedJSHeapSize),
        totalFormatted: formatBytes(performance.memory.totalJSHeapSize),
        limitFormatted: formatBytes(performance.memory.jsHeapSizeLimit),
        percentage: ((performance.memory.usedJSHeapSize / performance.memory.jsHeapSizeLimit) * 100).toFixed(2)
      };
    }
    return null;
  };
  
  const start = (interval = 5000) => {
    if (isMonitoring) return;
    
    isMonitoring = true;
    console.log('[内存监控] 开始监控，间隔:', interval, 'ms');
    
    monitorInterval = setInterval(() => {
      const info = getMemoryInfo();
      if (info) {
        console.log(`[内存监控] 使用: ${info.usedFormatted} / ${info.limitFormatted} (${info.percentage}%)`);
        
        // 如果内存使用超过70%，发出警告
        if (parseFloat(info.percentage) > 70) {
          console.warn('[内存警告] 内存使用率超过70%，建议清理资源');
        }
      }
    }, interval);
  };
  
  const stop = () => {
    if (monitorInterval) {
      clearInterval(monitorInterval);
      monitorInterval = null;
      isMonitoring = false;
      console.log('[内存监控] 已停止');
    }
  };
  
  const logCurrent = () => {
    const info = getMemoryInfo();
    if (info) {
      console.log('[内存状态]', info);
    } else {
      console.log('[内存状态] 浏览器不支持 performance.memory API');
    }
  };
  
  return {
    start,
    stop,
    getMemoryInfo,
    logCurrent
  };
})();

// 开发环境下自动启动监控
if (window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1') {
  // 延迟启动，避免影响页面加载
  setTimeout(() => {
    MemoryMonitor.start(10000); // 每10秒监控一次
  }, 3000);
}

window.MemoryMonitor = MemoryMonitor;