import React, { ReactNode, MouseEventHandler, ButtonHTMLAttributes, forwardRef } from 'react';
import { Stack } from './Stack';
import { Box, BoxProps } from './Box';
import { Loader2 } from 'lucide-react';
import { Icon } from './Icon';

interface ButtonProps extends Omit<ButtonHTMLAttributes<HTMLButtonElement>, 'as' | 'onMouseEnter' | 'onMouseLeave' | 'onSubmit'>, Omit<BoxProps<'button'>, 'as' | 'onClick' | 'onSubmit'> {
  children: ReactNode;
  onClick?: MouseEventHandler<HTMLButtonElement>;
  className?: string;
  variant?: 'primary' | 'secondary' | 'danger' | 'ghost' | 'race-final' | 'discord';
  size?: 'sm' | 'md' | 'lg';
  disabled?: boolean;
  isLoading?: boolean;
  type?: 'button' | 'submit' | 'reset';
  icon?: ReactNode;
  fullWidth?: boolean;
  as?: 'button' | 'a';
  href?: string;
  target?: string;
  rel?: string;
}

export const Button = forwardRef<HTMLButtonElement, ButtonProps>(({ 
  children, 
  onClick, 
  className = '',
  variant = 'primary',
  size = 'md',
  disabled = false,
  isLoading = false,
  type = 'button',
  icon,
  fullWidth = false,
  as = 'button',
  href,
  target,
  rel,
  ...props
}, ref) => {
  const baseClasses = 'inline-flex items-center justify-center rounded-none transition-all duration-150 ease-smooth focus-visible:outline focus-visible:outline-1 focus-visible:outline-offset-2 active:opacity-80 uppercase tracking-widest font-bold';
  
  const variantClasses = {
    primary: 'bg-primary-accent text-white hover:bg-primary-accent/90 focus-visible:outline-primary-accent shadow-[0_0_15px_rgba(25,140,255,0.3)] hover:shadow-[0_0_25px_rgba(25,140,255,0.5)]',
    secondary: 'bg-panel-gray text-white border border-border-gray hover:bg-border-gray/50 focus-visible:outline-primary-accent',
    danger: 'bg-critical-red text-white hover:bg-critical-red/90 focus-visible:outline-critical-red',
    ghost: 'bg-transparent text-gray-400 hover:text-white hover:bg-white/5 focus-visible:outline-gray-400',
    'race-final': 'bg-success-green text-graphite-black hover:bg-success-green/90 focus-visible:outline-success-green',
    discord: 'bg-[#5865F2] text-white hover:bg-[#4752C4] focus-visible:outline-[#5865F2]',
  };
  
  const sizeClasses = {
    sm: 'min-h-[32px] px-3 py-1 text-xs font-medium',
    md: 'min-h-[40px] px-4 py-2 text-sm font-medium',
    lg: 'min-h-[48px] px-6 py-3 text-base font-medium'
  };
  
  const disabledClasses = (disabled || isLoading) ? 'opacity-40 cursor-not-allowed' : 'cursor-pointer';
  const widthClasses = fullWidth ? 'w-full' : '';
  
  const classes = [
    baseClasses,
    variantClasses[variant],
    sizeClasses[size],
    disabledClasses,
    widthClasses,
    className
  ].filter(Boolean).join(' ');
  
  const content = (
    <Stack direction="row" align="center" gap={2} center={fullWidth}>
      {isLoading && <Icon icon={Loader2} size={size === 'sm' ? 3 : 4} animate="spin" />}
      {!isLoading && icon}
      {children}
    </Stack>
  );

  if (as === 'a') {
    return (
      <Box
        as="a"
        href={href}
        target={target}
        rel={rel}
        className={classes}
        {...props}
      >
        {content}
      </Box>
    );
  }

  return (
    <Box 
      as="button"
      ref={ref}
      type={type}
      className={classes}
      onClick={onClick}
      disabled={disabled || isLoading}
      {...props}
    >
      {content}
    </Box>
  );
});

Button.displayName = 'Button';