interface SkeletonLoaderProps {
  className?: string;
  variant?: 'text' | 'rect' | 'circle';
}

export function SkeletonLoader({ className = '', variant = 'rect' }: SkeletonLoaderProps) {
  const baseClasses = 'animate-pulse bg-gradient-to-r from-gray-200 via-gray-300 to-gray-200 bg-[length:200%_100%]';

  const variantClasses = {
    text: 'h-4 rounded',
    rect: 'rounded-lg',
    circle: 'rounded-full'
  };

  return (
    <div className={`${baseClasses} ${variantClasses[variant]} ${className}`} />
  );
}

export function PatternCanvasSkeleton() {
  return (
    <div className="bg-white p-6 rounded-lg shadow-md">
      <div className="flex items-center justify-between mb-4 pb-2 border-b-2 border-gray-300">
        <SkeletonLoader className="h-7 w-40" variant="text" />
      </div>
      <div className="relative w-full h-[600px] border border-gray-300 rounded bg-gray-50 overflow-hidden">
        <div className="flex items-center justify-center h-full">
          <div className="text-center space-y-4">
            <div className="relative w-24 h-24 mx-auto">
              <SkeletonLoader className="w-24 h-24" variant="circle" />
              <div className="absolute inset-0 flex items-center justify-center">
                <svg className="w-12 h-12 text-gray-400 animate-spin" fill="none" viewBox="0 0 24 24">
                  <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                  <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                </svg>
              </div>
            </div>
            <div className="space-y-2">
              <SkeletonLoader className="h-5 w-48 mx-auto" variant="text" />
              <SkeletonLoader className="h-4 w-64 mx-auto" variant="text" />
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

export function PatternInfoSkeleton() {
  return (
    <div className="mt-4">
      <SkeletonLoader className="h-6 w-40 mb-4" variant="text" />
      <div className="bg-gray-50 p-4 rounded-lg space-y-3">
        {[1, 2, 3, 4].map((i) => (
          <div key={i} className="flex justify-between">
            <SkeletonLoader className="h-4 w-24" variant="text" />
            <SkeletonLoader className="h-4 w-32" variant="text" />
          </div>
        ))}
      </div>
    </div>
  );
}

export function MachineConnectionSkeleton() {
  return (
    <div className="bg-white p-6 rounded-lg shadow-md">
      <div className="flex items-center justify-between mb-4 pb-2 border-b-2 border-gray-300">
        <SkeletonLoader className="h-7 w-48" variant="text" />
      </div>
      <div className="space-y-4">
        <div className="flex items-center justify-between">
          <SkeletonLoader className="h-4 w-16" variant="text" />
          <SkeletonLoader className="h-8 w-32 rounded-lg" />
        </div>
        <div className="bg-gray-50 p-4 rounded-lg space-y-2">
          <div className="flex justify-between">
            <SkeletonLoader className="h-4 w-20" variant="text" />
            <SkeletonLoader className="h-4 w-24" variant="text" />
          </div>
          <div className="flex justify-between">
            <SkeletonLoader className="h-4 w-24" variant="text" />
            <SkeletonLoader className="h-4 w-32" variant="text" />
          </div>
        </div>
      </div>
    </div>
  );
}