import * as React from 'react';
import { Slot } from '@radix-ui/react-slot';
import { cva, type VariantProps } from 'class-variance-authority';
import { cn } from '../utils/cn';
import { Loader2 } from 'lucide-react';

const buttonVariants = cva(
  '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-[var(--accent)] focus-visible:ring-offset-2 focus-visible:ring-offset-[var(--background)] disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
  {
    variants: {
      variant: {
        default:
          'bg-[var(--accent)] text-[var(--accent-foreground)] hover:bg-[var(--accent-hover)]',
        destructive:
          'bg-[var(--error)] text-white hover:bg-[var(--error)]/90',
        outline:
          'border border-[var(--border)] bg-transparent hover:bg-[var(--surface-100)] hover:border-[var(--border-hover)]',
        secondary:
          'bg-[var(--surface-200)] text-[var(--text-primary)] hover:bg-[var(--surface-300)]',
        ghost:
          'hover:bg-[var(--surface-100)] hover:text-[var(--text-primary)]',
        link: 'text-[var(--accent)] underline-offset-4 hover:underline',
      },
      size: {
        default: 'h-9 px-4 py-2',
        sm: 'h-8 rounded-md px-3 text-xs',
        lg: 'h-10 rounded-md px-8',
        icon: 'h-9 w-9',
      },
    },
    defaultVariants: {
      variant: 'default',
      size: 'default',
    },
  }
);

export interface ButtonProps
  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
    VariantProps<typeof buttonVariants> {
  asChild?: boolean;
  loading?: boolean;
}

const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant, size, asChild = false, loading, children, disabled, ...props }, ref) => {
    const Comp = asChild ? Slot : 'button';
    return (
      <Comp
        className={cn(buttonVariants({ variant, size, className }))}
        ref={ref}
        disabled={disabled || loading}
        {...props}
      >
        {loading && <Loader2 className="animate-spin" />}
        {children}
      </Comp>
    );
  }
);
Button.displayName = 'Button';

export { Button, buttonVariants };