import React from 'react';
import { cn, commonClasses } from '@/lib/utils';

interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: 'primary' | 'discord' | 'auth' | 'secondary' | 'ghost' | 'outline';
  size?: 'sm' | 'md' | 'lg';
  fullWidth?: boolean;
  leftIcon?: React.ReactNode;
  rightIcon?: React.ReactNode;
  loading?: boolean;
  children: React.ReactNode;
}

// Factorisation des classes de taille et de variante
const sizeClasses = {
  sm: 'px-4 py-2 text-sm',
  md: 'px-6 py-3 text-base',
  lg: 'px-8 py-4 text-lg',
} as const;

const variantClasses = {
  primary: 'bg-gradient-to-r from-blue-600 to-blue-500 text-white shadow-lg hover:shadow-xl hover:from-blue-700 hover:to-blue-600 border-2 border-blue-600/20',
  discord: 'bg-gradient-to-r from-indigo-600 to-purple-600 text-white shadow-lg hover:shadow-xl hover:from-indigo-700 hover:to-purple-700 border-2 border-indigo-600/20',
  auth: 'bg-gradient-to-r from-blue-500 to-blue-400 text-white shadow-lg hover:shadow-xl hover:from-blue-600 hover:to-blue-500 border-2 border-blue-500/20',
  secondary: 'bg-white text-blue-700 border-2 border-blue-600 shadow-md hover:shadow-lg hover:bg-blue-50',
  outline: 'bg-transparent text-gray-700 border-2 border-gray-300 hover:bg-gray-50 hover:border-gray-400',
  ghost: 'bg-transparent text-gray-700 hover:bg-gray-100',
} as const;

// Composant loading spinner réutilisable
const LoadingSpinner = () => (
  <svg className="animate-spin -ml-1 mr-3 h-5 w-5" 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>
);

export const Button: React.FC<ButtonProps> = ({
  variant = 'primary',
  size = 'md',
  fullWidth = false,
  leftIcon,
  rightIcon,
  loading = false,
  children,
  className = '',
  disabled,
  ...props
}) => {
  const isDisabled = disabled || loading;

  return (
    <button
      className={cn(
        commonClasses.buttonBase,
        commonClasses.transition,
        commonClasses.hoverScale,
        'focus:ring-4 focus:ring-blue-300',
        sizeClasses[size],
        variantClasses[variant],
        fullWidth && 'w-full',
        isDisabled && 'opacity-50 cursor-not-allowed transform-none',
        className
      )}
      disabled={isDisabled}
      {...props}
    >
      {loading && <LoadingSpinner />}
      {leftIcon && !loading && <span className="mr-2">{leftIcon}</span>}
      {children}
      {rightIcon && !loading && <span className="ml-2">{rightIcon}</span>}
    </button>
  );
};