'use client';

import { useEffect, useState, useRef } from 'react';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { RefreshCw, Download, Search, Pause, Play } from 'lucide-react';

interface LogViewerProps {}

export function LogViewer() {
  const [logs, setLogs] = useState<string[]>([]);
  const [loading, setLoading] = useState(true);
  const [autoRefresh, setAutoRefresh] = useState(true);
  const [filter, setFilter] = useState('');
  const filteredLogsRef = useRef<string[]>([]);

  const fetchLogs = async () => {
    try {
      const response = await fetch('/api/logs?lines=200');
      const data = await response.json();
      setLogs(data.logs || []);
    } catch (error) {
      console.error('Failed to fetch logs:', error);
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    fetchLogs();
    let interval: NodeJS.Timeout;
    if (autoRefresh) {
      interval = setInterval(fetchLogs, 3000); // Refresh every 3s
    }
    return () => clearInterval(interval);
  }, [autoRefresh]);

  const toggleAutoRefresh = () => {
    setAutoRefresh(!autoRefresh);
  };

  const handleDownload = () => {
    const content = logs.join('\n');
    const blob = new Blob([content], { type: 'text/plain' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `openclaw-logs-${new Date().toISOString()}.log`;
    a.click();
    URL.revokeObjectURL(url);
  };

  // Filter logs
  const filteredLogs = filter
    ? logs.filter((log) =>
        log.toLowerCase().includes(filter.toLowerCase())
      )
    : logs;

  filteredLogsRef.current = filteredLogs;

  // Parse log level for styling
  const getLogStyle = (log: string) => {
    if (log.toLowerCase().includes('error') || log.toLowerCase().includes('failed'))
      return 'text-red-400';
    if (log.toLowerCase().includes('warn'))
      return 'text-yellow-400';
    if (log.toLowerCase().includes('info'))
      return 'text-blue-400';
    return 'text-zinc-300';
  };

  return (
    <div className="space-y-4">
      {/* Controls */}
      <div className="flex flex-wrap gap-2 items-center">
        <Button
          variant="outline"
          onClick={fetchLogs}
          disabled={loading}
          className="border-zinc-700 hover:bg-zinc-800"
        >
          <RefreshCw className={`w-4 h-4 mr-2 ${loading ? 'animate-spin' : ''}`} />
          Refresh
        </Button>
        <Button
          variant={autoRefresh ? 'default' : 'outline'}
          onClick={toggleAutoRefresh}
          className={autoRefresh ? 'bg-orange-500 hover:bg-orange-600' : 'border-zinc-700 hover:bg-zinc-800'}
        >
          {autoRefresh ? (
            <>
              <Pause className="w-4 h-4 mr-2" />
              Auto-refresh On
            </>
          ) : (
            <>
              <Play className="w-4 h-4 mr-2" />
              Auto-refresh Off
            </>
          )}
        </Button>
        <Button
          variant="outline"
          onClick={handleDownload}
          className="border-zinc-700 hover:bg-zinc-800"
        >
          <Download className="w-4 h-4 mr-2" />
          Export
        </Button>
        <div className="flex-1 min-w-[200px]">
          <div className="relative">
            <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-zinc-500" />
            <Input
              placeholder="Filter logs..."
              value={filter}
              onChange={(e) => setFilter(e.target.value)}
              className="pl-10 bg-zinc-900/50 border-zinc-700 focus:border-orange-500"
            />
          </div>
        </div>
      </div>

      {/* Log Display */}
      <Card className="bg-zinc-900/50 border-zinc-800">
        <CardHeader>
          <CardTitle className="flex items-center justify-between">
            <span>Gateway Logs</span>
            <span className="text-sm font-normal text-zinc-400">
              {filteredLogs.length} entries
            </span>
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="h-[600px] overflow-auto rounded-lg bg-black/50 p-4 font-mono text-xs">
            {loading && logs.length === 0 ? (
              <div className="flex items-center justify-center h-full">
                <RefreshCw className="w-8 h-8 animate-spin text-orange-400" />
              </div>
            ) : filteredLogs.length === 0 ? (
              <div className="flex items-center justify-center h-full text-zinc-500">
                {filter ? 'No logs match your filter' : 'No logs available'}
              </div>
            ) : (
              <div className="space-y-1">
                {filteredLogs.map((log, index) => (
                  <div
                    key={index}
                    className={`whitespace-pre-wrap break-words ${getLogStyle(log)}`}
                  >
                    {log}
                  </div>
                ))}
              </div>
            )}
          </div>
        </CardContent>
      </Card>

      <div className="text-sm text-zinc-500">
        <p>ℹ️ Logs refresh automatically every 3 seconds when auto-refresh is enabled.</p>
      </div>
    </div>
  );
}