import { useState, useEffect } from "react";
import { BACKEND_URL, APP_CONFIG } from "../config/constants";

interface BackendHealthCheckProps {
  backendUrl?: string;
  checkInterval?: number;
}

export function BackendHealthCheck({ 
  checkInterval = APP_CONFIG.HEALTH_CHECK_INTERVAL
}: BackendHealthCheckProps) {
  // Only render in development mode
  if (import.meta.env.PROD) {
    return null;
  }

  const [backendStatus, setBackendStatus] = useState<'loading' | 'online' | 'offline'>('loading');
  const [showTooltip, setShowTooltip] = useState(false);
  const [copied, setCopied] = useState(false);
  const healthCheckUrl = `${BACKEND_URL}/api/health`;

  useEffect(() => {
    const checkBackendHealth = async () => {
      try {
        const response = await fetch(healthCheckUrl);
        if (response.ok) {
          const data = await response.json();
          if (data.status === 'ok') {
            setBackendStatus('online');
          } else {
            setBackendStatus('offline');
          }
        } else {
          setBackendStatus('offline');
        }
      } catch (error) {
        setBackendStatus('offline');
      }
    };

    checkBackendHealth();
    
    // Check health at specified interval
    const interval = setInterval(checkBackendHealth, checkInterval);
    
    return () => clearInterval(interval);
  }, [healthCheckUrl, checkInterval]);

  const handleCopyCode = async () => {
    const codeText = `cd backend/\nmake install\nmake backend`;
    try {
      await navigator.clipboard.writeText(codeText);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch (err) {
      console.error('Failed to copy text: ', err);
    }
  };

  const getStatusColor = () => {
    switch (backendStatus) {
      case 'online':
        return 'bg-green-500';
      case 'offline':
        return 'bg-red-500';
      case 'loading':
        return 'bg-yellow-500';
      default:
        return 'bg-gray-500';
    }
  };

  const getStatusText = () => {
    switch (backendStatus) {
      case 'online':
        return 'Backend Online';
      case 'offline':
        return 'Backend Offline';
      case 'loading':
        return 'Checking Backend...';
      default:
        return 'Unknown Status';
    }
  };

  return (
    <div className="absolute top-4 right-4">
      <div 
        className="relative flex items-center space-x-2 bg-gray-800 rounded-lg px-3 py-2 cursor-pointer hover:bg-gray-700 transition-colors"
        onMouseEnter={() => backendStatus === 'offline' && setShowTooltip(true)}
        onMouseLeave={() => setShowTooltip(false)}
      >
        <div className={`w-3 h-3 rounded-full ${getStatusColor()} animate-pulse`}></div>
        <span className="text-sm font-medium">{getStatusText()}</span>
        
        {/* Info icon when backend is offline */}
        {backendStatus === 'offline' && (
                <svg className="w-5 h-5 text-red-400" fill="currentColor" viewBox="0 0 20 20">
                <path fillRule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7 4a1 1 0 11-2 0 1 1 0 012 0zm-1-9a1 1 0 00-1 1v4a1 1 0 102 0V6a1 1 0 00-1-1z" clipRule="evenodd" />
              </svg>
        )}
        
        {/* Tooltip for offline backend */}
        {showTooltip && backendStatus === 'offline' && (
          <div 
            className="absolute top-full right-0 mt-2 w-fit bg-gray-900 text-white rounded-lg p-4 shadow-xl border border-gray-700 z-50"
            onMouseEnter={() => setShowTooltip(true)}
            onMouseLeave={() => setShowTooltip(false)}
          >
            <div className="flex items-start space-x-3">
              <div className="flex-1 min-w-0">
                <h3 className="text-sm font-semibold text-400 mb-3 text-left">Start the server with:</h3>
                <div className="relative">
                  <code className="text-xs bg-gray-800 text-green-400 px-3 py-2 rounded font-mono block w-fit overflow-x-auto text-left pr-12">
                    cd backend/<br/>
                    make install<br/>
                    make backend
                  </code>
                  <button
                    onClick={handleCopyCode}
                    className="absolute top-1 right-1 p-1 bg-gray-700 hover:bg-gray-600 rounded text-gray-300 hover:text-white transition-colors"
                    title="Copy to clipboard"
                  >
                    {copied ? (
                      <svg className="w-4 h-4 text-green-400" fill="currentColor" viewBox="0 0 20 20">
                        <path fillRule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clipRule="evenodd" />
                      </svg>
                    ) : (
                      <svg className="w-4 h-4" fill="currentColor" viewBox="0 0 20 20">
                        <path d="M8 3a1 1 0 011-1h2a1 1 0 110 2H9a1 1 0 01-1-1z" />
                        <path d="M6 3a2 2 0 00-2 2v11a2 2 0 002 2h8a2 2 0 002-2V5a2 2 0 00-2-2 3 3 0 01-3 3H9a3 3 0 01-3-3z" />
                      </svg>
                    )}
                  </button>
                </div>
              </div>
            </div>
            {/* Arrow pointing up */}
            <div className="absolute bottom-full right-4 w-0 h-0 border-l-4 border-r-4 border-b-4 border-transparent border-b-gray-900"></div>
          </div>
        )}
      </div>
    </div>
  );
}