import { forwardRef, type ButtonHTMLAttributes, type ReactNode } from 'react';
import { cn } from '../utils/cn';
import { Spinner } from './Spinner';

export type ButtonVariant = 'primary' | 'secondary' | 'ghost' | 'danger';
export type ButtonSize = 'sm' | 'md' | 'lg';

interface Props extends ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: ButtonVariant;
  size?: ButtonSize;
  loading?: boolean;
  leftIcon?: ReactNode;
  rightIcon?: ReactNode;
  fullWidth?: boolean;
}

const VARIANT_STYLES: Record<ButtonVariant, string> = {
  primary:
    'bg-brand-600 text-white hover:bg-brand-700 active:bg-brand-800 focus-visible:ring-brand-500 disabled:bg-brand-300',
  secondary:
    'bg-white text-slate-900 border border-slate-300 hover:bg-slate-50 active:bg-slate-100 focus-visible:ring-brand-500 disabled:bg-slate-50 disabled:text-slate-400',
  ghost:
    'bg-transparent text-slate-700 hover:bg-slate-100 active:bg-slate-200 focus-visible:ring-brand-500 disabled:text-slate-400',
  danger:
    'bg-red-600 text-white hover:bg-red-700 active:bg-red-800 focus-visible:ring-red-500 disabled:bg-red-300',
};

const SIZE_STYLES: Record<ButtonSize, string> = {
  sm: 'h-8 px-3 text-xs gap-1.5',
  md: 'h-10 px-4 text-sm gap-2',
  lg: 'h-12 px-6 text-base gap-2',
};

export const Button = forwardRef<HTMLButtonElement, Props>(function Button(
  {
    variant = 'primary',
    size = 'md',
    loading = false,
    leftIcon,
    rightIcon,
    fullWidth,
    className,
    disabled,
    children,
    type = 'button',
    ...rest
  },
  ref,
) {
  const isDisabled = disabled || loading;
  return (
    <button
      ref={ref}
      type={type}
      disabled={isDisabled}
      aria-busy={loading || undefined}
      className={cn(
        'inline-flex items-center justify-center rounded-md font-semibold transition-colors',
        'focus:outline-none focus-visible:ring-2 focus-visible:ring-offset-2',
        'disabled:cursor-not-allowed',
        VARIANT_STYLES[variant],
        SIZE_STYLES[size],
        fullWidth && 'w-full',
        className,
      )}
      {...rest}
    >
      {loading ? (
        <Spinner size={size === 'lg' ? 'md' : 'sm'} />
      ) : (
        leftIcon && <span aria-hidden>{leftIcon}</span>
      )}
      {children}
      {!loading && rightIcon && <span aria-hidden>{rightIcon}</span>}
    </button>
  );
});