web/src/components/ChessTimer.tsx

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

interface ChessTimerProps {
  isWhiteTurn: boolean;
  gameActive: boolean;
}

const ChessTimer: React.FC<ChessTimerProps> = ({ isWhiteTurn, gameActive }) => {
  const [whiteTime, setWhiteTime] = useState<number>(600); // 10 minutes in seconds
  const [blackTime, setBlackTime] = useState<number>(600); // 10 minutes in seconds
  
  useEffect(() => {
    let interval: NodeJS.Timeout | null = null;
    
    if (gameActive) {
      interval = setInterval(() => {
        if (isWhiteTurn) {
          setWhiteTime(prev => Math.max(0, prev - 1));
        } else {
          setBlackTime(prev => Math.max(0, prev - 1));
        }
      }, 1000);
    }
    
    return () => {
      if (interval) clearInterval(interval);
    };
  }, [isWhiteTurn, gameActive]);
  
  // Format time as mm:ss
  const formatTime = (seconds: number): string => {
    const mins = Math.floor(seconds / 60);
    const secs = seconds % 60;
    return `${mins.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`;
  };
  
  return (
    <div className="mb-4">
      <h3 className="text-lg font-medium mb-2">Time Control</h3>
      
      <div className="flex justify-between">
        <div className={`p-2 rounded ${isWhiteTurn && gameActive ? 'bg-blue-100 border-l-4 border-blue-500' : ''}`}>
          <div className="flex items-center">
            <div className="w-4 h-4 bg-white border border-gray-300 rounded-full mr-2"></div>
            <span className="font-medium">White:</span>
            <span className={`ml-2 ${whiteTime < 60 ? 'text-red-600' : ''}`}>
              {formatTime(whiteTime)}
            </span>
          </div>
        </div>
        
        <div className={`p-2 rounded ${!isWhiteTurn && gameActive ? 'bg-blue-100 border-l-4 border-blue-500' : ''}`}>
          <div className="flex items-center">
            <div className="w-4 h-4 bg-black rounded-full mr-2"></div>
            <span className="font-medium">Black:</span>
            <span className={`ml-2 ${blackTime < 60 ? 'text-red-600' : ''}`}>
              {formatTime(blackTime)}
            </span>
          </div>
        </div>
      </div>
    </div>
  );
};

export default ChessTimer;