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";
import { breadcrumb } from "@/lib/errorBreadcrumbs";

const buttonVariants = cva(
  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0",
  {
    variants: {
      variant: {
        default: "bg-accent text-accent-foreground hover:bg-accent/90",
        destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
        outline: "border border-input bg-background hover:bg-accent hover:text-accent-foreground",
        secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
        ghost: "hover:bg-accent hover:text-accent-foreground",
        link: "text-primary underline-offset-4 hover:underline",
      },
      size: {
        default: "h-10 px-4 py-2",
        sm: "h-9 rounded-md px-3",
        lg: "h-11 rounded-md px-8",
        icon: "h-10 w-10",
      },
    },
    defaultVariants: {
      variant: "default",
      size: "default",
    },
  },
);

export interface ButtonProps
  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
    VariantProps<typeof buttonVariants> {
  asChild?: boolean;
  trackingLabel?: string; // Optional label for breadcrumb tracking
  loading?: boolean; // Show loading state with spinner
  loadingText?: string; // Optional text to display during loading
}

const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ 
    className, 
    variant, 
    size, 
    asChild = false, 
    onClick, 
    trackingLabel, 
    loading = false,
    loadingText,
    children,
    disabled,
    ...props 
  }, ref) => {
    const Comp = asChild ? Slot : "button";
    
    const handleClick = (e: React.MouseEvent<HTMLButtonElement>) => {
      // Prevent clicks while loading
      if (loading) {
        e.preventDefault();
        return;
      }
      
      // Add breadcrumb for button click
      if (trackingLabel) {
        breadcrumb.userAction('clicked', trackingLabel);
      }
      
      // Call original onClick handler
      onClick?.(e);
    };
    
    return (
      <Comp 
        className={cn(buttonVariants({ variant, size, className }))} 
        ref={ref} 
        onClick={handleClick}
        disabled={disabled || loading}
        {...props}
      >
        {loading ? (
          <>
            <Loader2 className="mr-2 h-4 w-4 animate-spin" />
            {loadingText || children}
          </>
        ) : (
          children
        )}
      </Comp>
    );
  },
);
Button.displayName = "Button";

export { Button, buttonVariants };
