import React, { useState, useEffect } from 'react';
import {
  ResponsiveContainer, LineChart, Line,
  XAxis, YAxis, Tooltip, CartesianGrid, Legend
} from 'recharts';
import { fetchSysCost, fetchGpuUsage } from '../api/posts_trm';

function PerformanceLogs({ userId }) {
  const [data, setData] = useState([]);
  const [gpuData, setGpuData] = useState([]);
  const [loading, setLoading] = useState(true);
  const [unauthorized, setUnauthorized] = useState(false);

  useEffect(() => {
    setLoading(true);
    
    // 获取系统性能数据
    const fetchSystemData = fetchSysCost(userId)
      .then(result => {
        // 检查是否是权限错误
        if (typeof result === 'string' && result.startsWith('<!DOCTYPE')) {
          // 返回的是 HTML，说明未登录或接口错误
          setUnauthorized(true);
          setData([]);
          return;
        }
        if (result && result.status === 'error' && result.message === 'Unauthorized') {
          setUnauthorized(true);
          setData([]);
          return;
        }
        
        // 确保数据是数组格式
        let list = [];
        if (Array.isArray(result)) {
          list = result;
        } else if (Array.isArray(result.data)) {
          list = result.data;
        } else if (Array.isArray(result.syscost)) {
          list = result.syscost;
        }
        
        const msList = list.map(item => ({
          ...item,
          elapsed_time: item.elapsed_time * 1000,
          cpu_user: item.cpu_user * 1000,
          cpu_system: item.cpu_system * 1000,
          memory_rss: item.memory_rss / (1024 * 1024*8), // convert bytes to MB
          record_time_ts: new Date(item.record_time).getTime()    // add numeric timestamp
        }));
        console.log('Converted data:', msList[0]); // debug first item
        setData(msList);
        setUnauthorized(false);
      })
      .catch(err => {
        console.error('fetchSysCost error:', err);
        if (err.message === 'Unauthorized') {
          setUnauthorized(true);
          setData([]);
        }
      });

    // 获取GPU数据
    const fetchGpuData = fetchGpuUsage(100)
      .then(result => {
        if (typeof result === 'string' && result.startsWith('<!DOCTYPE')) {
          // 返回的是 HTML，说明未登录或接口错误
          setGpuData([]);
          return;
        }
        console.log('GPU data:', result);
        const processedData = processGpuData(result);
        setGpuData(processedData);
      })
      .catch(err => {
        console.error('fetchGpuUsage error:', err);
      });

    Promise.all([fetchSystemData, fetchGpuData])
      .finally(() => setLoading(false));
  }, [userId]);

  // 处理GPU数据，按时间戳分组
  const processGpuData = (rawData) => {
    const timeMap = new Map();
    
    rawData.forEach(record => {
      const timestamp = new Date(record.timestamp).getTime();
      if (!timeMap.has(timestamp)) {
        timeMap.set(timestamp, { timestamp });
      }
      const timeEntry = timeMap.get(timestamp);
      timeEntry[`gpu${record.gpu_id}_usage`] = record.gpu_usage;
      timeEntry[`gpu${record.gpu_id}_memory`] = record.gpu_memory_usage;
    });
    
    return Array.from(timeMap.values()).sort((a, b) => a.timestamp - b.timestamp);
  };

  // 获取GPU颜色
  const getGpuColors = () => {
    return ['#8884d8', '#82ca9d', '#ffc658', '#ff7300', '#8dd1e1', '#d084d0', '#ffb347', '#87ceeb'];
  };

  // 获取唯一的GPU ID列表
  const getGpuIds = () => {
    const ids = new Set();
    gpuData.forEach(entry => {
      Object.keys(entry).forEach(key => {
        if (key.includes('gpu') && key.includes('_usage')) {
          const gpuId = key.replace('_usage', '').replace('gpu', '');
          ids.add(gpuId);
        }
      });
    });
    return Array.from(ids).sort((a, b) => parseInt(a) - parseInt(b));
  };

  if (loading) {
    return (
      <section className="dashboard-performance">
        <div style={{ 
          display: 'flex', 
          justifyContent: 'center', 
          alignItems: 'center', 
          height: '400px',
          flexDirection: 'column'
        }}>
          <div style={{
            border: '4px solid #f3f3f3',
            borderTop: '4px solid #3498db',
            borderRadius: '50%',
            width: '50px',
            height: '50px',
            animation: 'spin 1s linear infinite'
          }}></div>
          <p style={{ marginTop: '20px', color: '#666' }}>加载中...</p>
          <style>{`
            @keyframes spin {
              0% { transform: rotate(0deg); }
              100% { transform: rotate(360deg); }
            }
          `}</style>
        </div>
      </section>
    );
  }

  if (unauthorized) {
    return (
      <section className="dashboard-performance">
        <div style={{ 
          display: 'flex', 
          justifyContent: 'center', 
          alignItems: 'center', 
          height: '400px',
          flexDirection: 'column',
          textAlign: 'center'
        }}>
          <div style={{ 
            fontSize: '18px',
            color: '#ff4d4f',
            marginBottom: '10px'
          }}>
            权限不足，无法访问性能监控数据
          </div>
          <div style={{ 
            fontSize: '14px',
            color: '#666'
          }}>
            请联系管理员获取相应权限
          </div>
        </div>
      </section>
    );
  }

  return (
    <section className="dashboard-performance">
      {/* GPU使用率图表 */}
      <div style={{ marginBottom: '30px' }}>
        <h3>GPU 使用率</h3>
        <ResponsiveContainer width="100%" height={300}>
          <LineChart data={gpuData} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
            <CartesianGrid strokeDasharray="3 3" />
            <XAxis
              dataKey="timestamp"
              type="number"
              domain={['dataMin', 'dataMax']}
              tickFormatter={ts => new Date(ts).toLocaleTimeString()}
            />
            <YAxis domain={[0, 100]} label={{ value: '使用率 (%)', angle: -90, position: 'insideLeft' }} />
            <Tooltip 
              formatter={(val, name) => [`${val != null && typeof val === 'number' ? val.toFixed(2) : val}%`, name]}
              labelFormatter={ts => new Date(ts).toLocaleString()}
            />
            <Legend />
            {getGpuIds().map((gpuId, index) => (
              <Line
                key={`gpu${gpuId}_usage`}
                type="monotone"
                dataKey={`gpu${gpuId}_usage`}
                stroke={getGpuColors()[index % getGpuColors().length]}
                name={`GPU ${gpuId} 使用率`}
                connectNulls={false}
              />
            ))}
          </LineChart>
        </ResponsiveContainer>
      </div>

      {/* GPU内存占用图表 */}
      <div style={{ marginBottom: '30px' }}>
        <h3>GPU 内存占用</h3>
        <ResponsiveContainer width="100%" height={300}>
          <LineChart data={gpuData} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
            <CartesianGrid strokeDasharray="3 3" />
            <XAxis
              dataKey="timestamp"
              type="number"
              domain={['dataMin', 'dataMax']}
              tickFormatter={ts => new Date(ts).toLocaleTimeString()}
            />
            <YAxis domain={[0, 'auto']} label={{ value: '内存 (MB)', angle: -90, position: 'insideLeft' }} />
            <Tooltip 
              formatter={(val, name) => [`${val != null && typeof val === 'number' ? val.toFixed(2) : val} MB`, name]}
              labelFormatter={ts => new Date(ts).toLocaleString()}
            />
            <Legend />
            {getGpuIds().map((gpuId, index) => (
              <Line
                key={`gpu${gpuId}_memory`}
                type="monotone"
                dataKey={`gpu${gpuId}_memory`}
                stroke={getGpuColors()[index % getGpuColors().length]}
                name={`GPU ${gpuId} 内存`}
                connectNulls={false}
              />
            ))}
          </LineChart>
        </ResponsiveContainer>
      </div>

      {/* 响应时间图表 */}
      <div style={{ marginBottom: '30px' }}>
        <h3>响应时间</h3>
        <ResponsiveContainer width="100%" height={300}>
          <LineChart data={data} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
            <CartesianGrid strokeDasharray="3 3" />
            <XAxis
              dataKey="record_time_ts"
              type="number"
              domain={['dataMin', 'dataMax']}
              tickFormatter={ts => new Date(ts).toLocaleTimeString()}
            />
            <YAxis domain={[0, 'auto']} label={{ value: '时间 (ms)', angle: -90, position: 'insideLeft' }} />
            <Tooltip formatter={(val) => typeof val === 'number' ? `${val.toFixed(2)} ms` : val} />
            <Legend />
            <Line type="monotone" dataKey="elapsed_time" stroke="#8884d8" name="响应时间 (ms)" />
          </LineChart>
        </ResponsiveContainer>
      </div>

      {/* CPU时间图表 */}
      <div style={{ marginBottom: '30px' }}>
        <h3>CPU 使用时间</h3>
        <ResponsiveContainer width="100%" height={300}>
          <LineChart data={data} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
            <CartesianGrid strokeDasharray="3 3" />
            <XAxis
              dataKey="record_time_ts"
              type="number"
              domain={['dataMin', 'dataMax']}
              tickFormatter={ts => new Date(ts).toLocaleTimeString()}
            />
            <YAxis domain={[0, 'auto']} label={{ value: '时间 (ms)', angle: -90, position: 'insideLeft' }} />
            <Tooltip formatter={(val) => typeof val === 'number' ? `${val.toFixed(2)} ms` : val} />
            <Legend />
            <Line type="monotone" dataKey="cpu_user" stroke="#82ca9d" name="CPU 用户时间 (ms)" />
            <Line type="monotone" dataKey="cpu_system" stroke="#ffc658" name="CPU 系统时间 (ms)" />
          </LineChart>
        </ResponsiveContainer>
      </div>

      {/* 内存图表 */}
      <div style={{ marginBottom: '30px' }}>
        <h3>内存使用</h3>
        <ResponsiveContainer width="100%" height={300}>
          <LineChart data={data} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
            <CartesianGrid strokeDasharray="3 3" />
            <XAxis
              dataKey="record_time_ts"
              type="number"
              domain={['dataMin', 'dataMax']}
              tickFormatter={ts => new Date(ts).toLocaleTimeString()}
            />
            <YAxis domain={[0, 'auto']} label={{ value: '内存 (MB)', angle: -90, position: 'insideLeft' }} />
            <Tooltip formatter={(val) => typeof val === 'number' ? `${val.toFixed(2)} MB` : val} />
            <Legend />
            <Line type="monotone" dataKey="memory_rss" stroke="#ff7300" name="内存 RSS" />
          </LineChart>
        </ResponsiveContainer>
      </div>
    </section>
  );
}

export default PerformanceLogs;