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

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

const buttonVariants = cva(
  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all duration-200 cursor-pointer disabled:pointer-events-none disabled:opacity-50 disabled:cursor-not-allowed [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive active:scale-[0.98]",
  {
    variants: {
      variant: {
        default:
          "bg-primary text-primary-foreground shadow-sm hover:bg-primary/90 hover:shadow-md hover:shadow-primary/25",
        destructive:
          "bg-destructive text-white shadow-sm hover:bg-destructive/90 hover:shadow-md hover:shadow-destructive/25 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
        outline:
          "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50",
        secondary:
          "bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/80",
        ghost:
          "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
        link: "text-primary underline-offset-4 hover:underline active:scale-100",
        "animated-outline":
          "relative overflow-hidden rounded-xl hover:bg-transparent shadow-none",
      },
      size: {
        default: "h-9 px-4 py-2 has-[>svg]:px-3",
        sm: "h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5",
        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
        icon: "size-9",
        "icon-sm": "size-8",
        "icon-lg": "size-10",
      },
    },
    defaultVariants: {
      variant: "default",
      size: "default",
    },
  }
);

// Loading spinner component
function ButtonSpinner({ className }: { className?: string }) {
  return (
    <Loader2
      className={cn("size-4 animate-spin", className)}
      aria-hidden="true"
    />
  );
}

function Button({
  className,
  variant,
  size,
  asChild = false,
  loading = false,
  disabled,
  children,
  ...props
}: React.ComponentProps<"button"> &
  VariantProps<typeof buttonVariants> & {
    asChild?: boolean;
    loading?: boolean;
  }) {
  const isDisabled = disabled || loading;

  // Special handling for animated-outline variant
  if (variant === "animated-outline" && !asChild) {
    return (
      <button
        className={cn(
          buttonVariants({ variant, size }),
          "p-[1px]", // Force 1px padding for the gradient border
          className
        )}
        data-slot="button"
        disabled={isDisabled}
        {...props}
      >
        {/* Animated rotating gradient border - smoother animation */}
        <span className="absolute inset-[-1000%] animate-[spin_3s_linear_infinite] animated-outline-gradient opacity-75 transition-opacity duration-300 group-hover:opacity-100" />

        {/* Inner content container */}
        <span
          className={cn(
            "animated-outline-inner inline-flex h-full w-full cursor-pointer items-center justify-center gap-2 rounded-[10px] px-4 py-1 text-sm font-medium backdrop-blur-3xl transition-all duration-200",
            size === "sm" && "px-3 text-xs gap-1.5",
            size === "lg" && "px-8",
            size === "icon" && "p-0 gap-0"
          )}
        >
          {loading && <ButtonSpinner />}
          {children}
        </span>
      </button>
    );
  }

  const Comp = asChild ? Slot : "button";

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

export { Button, buttonVariants };