/**
 * Button Component
 * Reusable button with multiple variants and sizes
 */

import React, { ButtonHTMLAttributes, ReactNode } from 'react';

export interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: 'primary' | 'secondary' | 'ghost' | 'danger';
  size?: 'sm' | 'md' | 'lg';
  loading?: boolean;
  icon?: ReactNode;
  children: ReactNode;
}

export const Button: React.FC<ButtonProps> = ({
  variant = 'primary',
  size = 'md',
  loading = false,
  icon,
  children,
  disabled,
  className = '',
  ...props
}) => {
  const baseStyles = 'inline-flex items-center justify-center font-semibold rounded-lg transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2';
  
  const variantStyles = {
    primary: 'bg-gradient-to-r from-purple-600 to-pink-600 text-white hover:from-purple-700 hover:to-pink-700 focus:ring-purple-500',
    secondary: 'bg-gray-800 text-gray-100 border border-gray-700 hover:bg-gray-700 focus:ring-gray-600',
    ghost: 'bg-transparent text-gray-300 hover:bg-gray-800 focus:ring-gray-700',
    danger: 'bg-red-600 text-white hover:bg-red-700 focus:ring-red-500',
  };
  
  const sizeStyles = {
    sm: 'px-3 py-1.5 text-sm',
    md: 'px-4 py-2 text-base',
    lg: 'px-6 py-3 text-lg',
  };
  
  const disabledStyles = 'opacity-50 cursor-not-allowed';
  
  return (
    <button
      className={`
        ${baseStyles}
        ${variantStyles[variant]}
        ${sizeStyles[size]}
        ${(disabled || loading) ? disabledStyles : ''}
        ${className}
      `}
      disabled={disabled || loading}
      {...props}
    >
      {loading && (
        <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"
          />
          <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"
          />
        </svg>
      )}
      {icon && !loading && <span className="mr-2">{icon}</span>}
      {children}
    </button>
  );
};