import { ButtonHTMLAttributes, forwardRef } from 'react'
import { cn } from '@/lib/utils'

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

export const Button = forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant = 'primary', size = 'md', loading, disabled, children, ...props }, ref) => {
    const baseStyles = 'inline-flex items-center justify-center font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 disabled:opacity-50 disabled:pointer-events-none'
    const variants = {
      primary: 'bg-indigo-600 text-white hover:bg-indigo-700 focus-visible:ring-indigo-500 dark:bg-indigo-500 dark:hover:bg-indigo-600',
      secondary: 'bg-gray-100 text-gray-900 hover:bg-gray-200 focus-visible:ring-gray-500 dark:bg-gray-800 dark:text-gray-100 dark:hover:bg-gray-700',
      outline: 'border border-gray-300 bg-transparent hover:bg-gray-100 focus-visible:ring-gray-500 dark:border-gray-600 dark:hover:bg-gray-800',
      ghost: 'bg-transparent hover:bg-gray-100 focus-visible:ring-gray-500 dark:hover:bg-gray-800',
      danger: 'bg-red-600 text-white hover:bg-red-700 focus-visible:ring-red-500',
    }
    const sizes = {
      sm: 'h-8 px-3 text-sm gap-1.5',
      md: 'h-10 px-4 text-sm gap-2',
      lg: 'h-12 px-6 text-base gap-2',
    }

    return (
      <button
        ref={ref}
        className={cn(baseStyles, variants[variant], sizes[size], className)}
        disabled={disabled || loading}
        {...props}
      >
        {loading && (
          <svg className="animate-spin h-4 w-4" viewBox="0 0 24 24">
            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" fill="none" />
            <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>
        )}
        {children}
      </button>
    )
  }
)

Button.displayName = 'Button'