import { type ReactElement, type ComponentProps, forwardRef } from "react";
import { cva, type VariantProps } from "class-variance-authority";
import { Loader2 } from "lucide-react";
import { cn } from "@/lib/utils";
import { Slot } from "@/lib/slot";

/**
 * Button — WealthX Design System
 * Figma: https://www.figma.com/design/9V9F0NGVsif8LGmEhVjOcT/Design-System---shadcn?node-id=72-2719
 *
 * Base: official shadcn new-york button (npx shadcn\@latest add button)
 * WealthX overrides: variants, square corners, font-sans, loading state
 */
const buttonVariants = cva(
  "inline-flex shrink-0 cursor-pointer items-center justify-center gap-2 font-sans text-button whitespace-nowrap transition-all active:scale-[0.98] outline-none focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 disabled:pointer-events-none disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
  {
    variants: {
      variant: {
        default:
          "bg-primary text-primary-foreground shadow-xs hover:bg-primary/90",
        secondary:
          "bg-brand-secondary text-brand-secondary-foreground shadow-xs hover:bg-brand-secondary/80 focus-visible:ring-brand-secondary/30",
        destructive:
          "bg-destructive text-destructive-foreground shadow-xs hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:bg-destructive/60 dark:focus-visible:ring-destructive/40",
        outline:
          "border border-input bg-background shadow-xs hover:bg-accent hover:text-accent-foreground focus-visible:border-border focus-visible:ring-border/50 dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
        "outline-primary":
          "border border-primary text-foreground bg-transparent shadow-xs hover:bg-primary/5 focus-visible:ring-primary/50",
        "outline-secondary":
          "border border-brand-secondary text-brand-secondary bg-transparent shadow-xs hover:bg-brand-secondary/10 focus-visible:border-brand-secondary focus-visible:ring-brand-secondary/30",
        ghost:
          "hover:bg-accent hover:text-accent-foreground hover:shadow-xs focus-visible:ring-border/50 dark:hover:bg-accent/50",
        link: "text-primary underline-offset-4 hover:underline",
      },
      size: {
        default: "h-9 px-4 py-2 has-[>svg]:px-3",
        xs: "h-6 gap-1 px-2 text-button-xs has-[>svg]:px-1.5 [&_svg:not([class*='size-'])]:size-3",
        sm: "h-8 gap-1.5 px-3 has-[>svg]:px-2.5",
        lg: "h-10 px-6 has-[>svg]:px-4",
        icon: "size-9",
        "icon-xs": "size-6 [&_svg:not([class*='size-'])]:size-3",
        "icon-sm": "size-8",
        "icon-lg": "size-10",
      },
    },
    defaultVariants: {
      variant: "default",
      size: "default",
    },
  },
);

export type ButtonProps = ComponentProps<"button"> &
  VariantProps<typeof buttonVariants> & {
    asChild?: boolean;
    /** Shows spinner and disables the button. Icon-only sizes hide the icon. */
    loading?: boolean;
  };

const Button = forwardRef<HTMLButtonElement, ButtonProps>(function Button(
  {
    className,
    variant,
    size,
    asChild = false,
    loading = false,
    disabled,
    type = "button",
    children,
    ...props
  },
  ref,
): ReactElement {
  const Comp = asChild ? Slot : "button";
  const isIconOnly =
    size === "icon" ||
    size === "icon-xs" ||
    size === "icon-sm" ||
    size === "icon-lg";

  return (
    <Comp
      className={cn(buttonVariants({ variant, size, className }))}
      data-size={size}
      data-slot="button"
      data-variant={variant}
      disabled={loading || disabled}
      ref={ref}
      type={type}
      {...props}
    >
      {loading ? (
        <>
          <Loader2 aria-hidden="true" className="animate-spin" />
          {!isIconOnly && children}
        </>
      ) : (
        children
      )}
    </Comp>
  );
});

export { Button, buttonVariants };