import * as React from 'react';

import { cn } from '@/lib/utils';

const buttonBase =
  'inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0';

const variantClass: Record<'default' | 'destructive' | 'outline' | 'secondary' | 'ghost' | 'link', string> = {
  default: 'bg-primary text-primary-foreground shadow hover:bg-primary/90',
  destructive: 'bg-destructive text-destructive-foreground shadow-sm hover:bg-destructive/90',
  outline: 'border border-border bg-background shadow-sm hover:bg-accent hover:text-accent-foreground',
  secondary: 'bg-secondary text-secondary-foreground shadow-sm hover:bg-secondary/80',
  ghost: 'hover:bg-accent hover:text-accent-foreground',
  link: 'text-primary underline-offset-4 hover:underline',
};

const sizeClass: Record<'default' | 'sm' | 'lg' | 'icon', string> = {
  default: 'h-9 px-4 py-2',
  sm: 'h-8 rounded-md px-3 text-xs',
  lg: 'h-10 rounded-md px-8',
  icon: 'size-9',
};

export type ButtonVariant = keyof typeof variantClass;
export type ButtonSize = keyof typeof sizeClass;

export function buttonVariants(opts?: {
  variant?: ButtonVariant;
  size?: ButtonSize;
  className?: string;
}) {
  const variant = opts?.variant ?? 'default';
  const size = opts?.size ?? 'default';
  return cn(buttonBase, variantClass[variant], sizeClass[size], opts?.className);
}

export interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: ButtonVariant;
  size?: ButtonSize;
}

const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant = 'default', size = 'default', ...props }, ref) => (
    <button ref={ref} className={buttonVariants({ variant, size, className })} {...props} />
  ),
);
Button.displayName = 'Button';

export { Button };