import * as React from "react";
import { cn } from "@/lib/utils";

type Variant = "primary" | "secondary" | "outline" | "ghost" | "danger";
type Size = "sm" | "md" | "lg" | "icon";

const variants: Record<Variant, string> = {
  primary:
    "inline-flex items-center justify-center gap-2 rounded-lg bg-indigo-600 px-4 py-2 text-sm font-medium text-white shadow-sm transition-colors hover:bg-indigo-500 disabled:pointer-events-none disabled:opacity-50",
  secondary:
    "inline-flex items-center justify-center gap-2 rounded-lg bg-muted px-4 py-2 text-sm font-medium text-foreground transition-colors hover:bg-muted/80 disabled:pointer-events-none disabled:opacity-50",
  outline:
    "inline-flex items-center justify-center gap-2 rounded-lg border border-border bg-card px-4 py-2 text-sm font-medium text-foreground transition-colors hover:bg-muted disabled:pointer-events-none disabled:opacity-50",
  ghost:
    "inline-flex items-center justify-center gap-2 rounded-lg px-4 py-2 text-sm font-medium text-muted-foreground transition-colors hover:bg-muted hover:text-foreground disabled:pointer-events-none disabled:opacity-50",
  danger:
    "inline-flex items-center justify-center gap-2 rounded-lg bg-red-600 px-4 py-2 text-sm font-medium text-white shadow-sm transition-colors hover:bg-red-500 disabled:pointer-events-none disabled:opacity-50",
};

const sizes: Record<Size, string> = {
  sm: "h-8 px-3 text-xs",
  md: "h-10",
  lg: "h-12 px-6 text-base",
  icon: "h-10 w-10 px-0",
};

export interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: Variant;
  size?: Size;
  loading?: boolean;
}

export const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant = "primary", size = "md", loading, children, disabled, ...props }, ref) => (
    <button
      ref={ref}
      className={cn(variants[variant], sizes[size], className)}
      disabled={disabled || loading}
      {...props}
    >
      {loading ? <Spinner /> : children}
    </button>
  )
);
Button.displayName = "Button";

export function Spinner({ className }: { className?: string }) {
  return (
    <span
      className={cn(
        "inline-block h-4 w-4 animate-spin rounded-full border-2 border-current border-t-transparent",
        className
      )}
    />
  );
}