import React from 'react';

interface ButtonProps {
  children: React.ReactNode;
  variant?: 'primary' | 'secondary' | 'outline' | 'ghost';
  size?: 'small' | 'medium' | 'large';
  disabled?: boolean;
  loading?: boolean;
  onClick?: () => void;
  type?: 'button' | 'submit' | 'reset';
  className?: string;
}

/**
 * Button Atom - Reusable button component
 * Example atom component - feel free to modify or delete
 */
export const Button: React.FC<ButtonProps> = ({
  children,
  variant = 'primary',
  size = 'medium',
  disabled = false,
  loading = false,
  onClick,
  type = 'button',
  className = ''
}) => {
  const baseClasses = 'font-medium rounded-lg transition-colors focus:outline-none focus:ring-2';
  
  const variantClasses = {
    primary: 'bg-blue-600 text-white hover:bg-blue-700 focus:ring-blue-500',
    secondary: 'bg-gray-600 text-white hover:bg-gray-700 focus:ring-gray-500',
    outline: 'border-2 border-blue-600 text-blue-600 hover:bg-blue-50 focus:ring-blue-500',
    ghost: 'text-blue-600 hover:bg-blue-50 focus:ring-blue-500'
  };

  const sizeClasses = {
    small: 'px-3 py-1.5 text-sm',
    medium: 'px-4 py-2 text-base',
    large: 'px-6 py-3 text-lg'
  };

  const classes = [
    baseClasses,
    variantClasses[variant],
    sizeClasses[size],
    disabled || loading ? 'opacity-50 cursor-not-allowed' : 'cursor-pointer',
    className
  ].join(' ');

  return (
    <button
      type={type}
      className={classes}
      onClick={onClick}
      disabled={disabled || loading}
    >
      {loading ? (
        <div className="flex items-center">
          <svg className="animate-spin -ml-1 mr-2 h-4 w-4" xmlns="http://www.w3.org/2000/svg" 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>
          Loading...
        </div>
      ) : (
        children
      )}
    </button>
  );
};