'use client';

import * as React from 'react';
import { Slot } from 'radix-ui';
import { cva, type VariantProps } from '@/lib/cva';

import { cn } from '@/lib/utils';
import { disabledState, focusRing, iconSizing, invalidState } from '@/lib/cva-presets';

const buttonVariants = cva(
  cn(
    "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium shrink-0",
    'transition-[color,box-shadow,background-color] duration-(--ui-duration-fast) ease-(--ui-ease-standard)',
    focusRing,
    disabledState,
    invalidState,
    iconSizing
  ),
  {
    variants: {
      variant: {
        /** Primary call to action. One per view, ideally. */
        default: 'bg-primary text-primary-foreground shadow-xs hover:bg-primary/90',
        /** Irreversible or data-losing actions. */
        destructive:
          'bg-destructive text-destructive-foreground shadow-xs hover:bg-destructive/90 focus-visible:ring-destructive/40',
        /** Secondary action that still needs an obvious hit area. */
        outline:
          'border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:hover:bg-input/50',
        /** Neutral action sitting next to a primary one. */
        secondary: 'bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/80',
        /** Low-emphasis action inside dense UI (toolbars, table rows). */
        ghost: 'hover:bg-accent hover:text-accent-foreground',
        /** Reads as a link but behaves as a button. */
        link: 'text-primary underline-offset-4 hover:underline',
      },
      size: {
        sm: 'h-8 gap-1.5 rounded-md px-3 has-[>svg]:px-2.5',
        md: 'h-9 px-4 py-2 has-[>svg]:px-3',
        lg: 'h-10 rounded-md px-6 has-[>svg]:px-4',
        /** Square button for a lone icon — always pair with `aria-label`. */
        icon: 'size-9 rounded-md',
      },
    },
    defaultVariants: {
      variant: 'default',
      size: 'md',
    },
  }
);

export interface ButtonProps
  extends React.ComponentProps<'button'>,
    VariantProps<typeof buttonVariants> {
  /**
   * Render the child element instead of a `<button>`, forwarding all styling
   * and behaviour to it. Use it to make a router `<Link>` look like a button
   * without nesting an anchor inside a button.
   */
  asChild?: boolean;
}

/**
 * The kit's primary interactive control.
 *
 * ```tsx
 * <Button variant="outline" size="sm">Cancel</Button>
 * <Button asChild><Link to="/docs">Docs</Link></Button>
 * ```
 */
function Button({ className, variant, size, asChild = false, ...props }: ButtonProps) {
  const Comp = asChild ? Slot.Root : 'button';

  return (
    <Comp
      data-slot="button"
      className={cn(buttonVariants({ variant, size }), className)}
      {...props}
    />
  );
}

export { Button, buttonVariants };