import React, { useState, useEffect } from 'react';

interface PathAnalyticsProps {
  startTime: string;
  endTime: string;
  linkId?: string;
}

interface PathData {
  path: string;
  count: number;
  percentage: number;
}

const PathAnalytics: React.FC<PathAnalyticsProps> = ({ startTime, endTime, linkId }) => {
  const [loading, setLoading] = useState(true);
  const [pathData, setPathData] = useState<PathData[]>([]);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (!linkId) {
      setLoading(false);
      return;
    }
    
    const fetchPathData = async () => {
      try {
        const params = new URLSearchParams({
          startTime,
          endTime,
          linkId
        });
        
        const response = await fetch(`/api/events/path-analytics?${params.toString()}`);
        
        if (!response.ok) {
          throw new Error('Failed to fetch path analytics data');
        }
        
        const result = await response.json();
        
        if (result.success && result.data) {
          // 自定义处理路径数据，根据是否有子路径来分组
          const rawData = result.data;
          const pathMap = new Map<string, number>();
          let totalClicks = 0;
          
          rawData.forEach((item: PathData) => {
            const urlPath = item.path;
            totalClicks += item.count;
            
            // 解析路径，检查是否有子路径
            const pathParts = urlPath.split('?')[0].split('/').filter(Boolean);
            
            // 基础路径（例如/5seaii）或者带有查询参数但没有子路径的路径视为同一个路径
            // 子路径（例如/5seaii/bbbbb）单独统计
            const groupKey = pathParts.length > 1 ? urlPath : `/${pathParts[0]}`;
            
            const currentCount = pathMap.get(groupKey) || 0;
            pathMap.set(groupKey, currentCount + item.count);
          });
          
          // 转换回数组并排序
          const groupedPathData = Array.from(pathMap.entries())
            .map(([path, count]) => ({
              path,
              count,
              percentage: totalClicks > 0 ? count / totalClicks : 0,
            }))
            .sort((a, b) => b.count - a.count);
          
          setPathData(groupedPathData);
        } else {
          setError(result.error || 'Failed to load path analytics');
        }
      } catch (err) {
        setError(err instanceof Error ? err.message : 'An error occurred');
      } finally {
        setLoading(false);
      }
    };
    
    fetchPathData();
  }, [startTime, endTime, linkId]);
  
  if (loading) {
    return <div className="py-8 flex justify-center">
      <div className="animate-spin rounded-full h-8 w-8 border-t-2 border-b-2 border-blue-500" />
    </div>;
  }
  
  if (error) {
    return <div className="py-4 text-red-500">{error}</div>;
  }
  
  if (!linkId) {
    return <div className="py-4 text-gray-500">Select a specific link to view path analytics.</div>;
  }
  
  if (pathData.length === 0) {
    return <div className="py-4 text-gray-500">No path data available for this link.</div>;
  }
  
  return (
    <div>
      <div className="text-sm text-gray-500 mb-4">
        Note: Paths are grouped by subpath. URLs with different query parameters but the same base path (without subpath) are grouped together.
      </div>
      <div className="overflow-x-auto">
        <table className="min-w-full divide-y divide-gray-200">
          <thead>
            <tr>
              <th className="px-6 py-3 bg-gray-50 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Path</th>
              <th className="px-6 py-3 bg-gray-50 text-right text-xs font-medium text-gray-500 uppercase tracking-wider">Clicks</th>
              <th className="px-6 py-3 bg-gray-50 text-right text-xs font-medium text-gray-500 uppercase tracking-wider">Percentage</th>
            </tr>
          </thead>
          <tbody className="bg-white divide-y divide-gray-200">
            {pathData.map((item, index) => (
              <tr key={index} className={index % 2 === 0 ? 'bg-white' : 'bg-gray-50'}>
                <td className="px-6 py-4 whitespace-nowrap text-sm font-medium text-gray-900">{item.path}</td>
                <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-500 text-right">{item.count}</td>
                <td className="px-6 py-4 whitespace-nowrap text-right">
                  <div className="flex items-center justify-end">
                    <span className="text-sm text-gray-500 mr-2">{(item.percentage * 100).toFixed(1)}%</span>
                    <div className="w-32 bg-gray-200 rounded-full h-2.5">
                      <div className="bg-blue-600 h-2.5 rounded-full" style={{ width: `${item.percentage * 100}%` }}></div>
                    </div>
                  </div>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  );
};

export default PathAnalytics;