import * as React from "react";
import { cn } from "../lib/utils";
import { X } from "lucide-react";
import { cva } from "class-variance-authority";
import { Progress } from "./progress";


/* Toast Components */
const ToastProvider = ({ children }: { children: React.ReactNode }) => {
  return <div className="toast-provider">{children}</div>;
};

const ToastViewport = React.forwardRef<
  HTMLDivElement,
  React.HTMLAttributes<HTMLDivElement>
>(({ className, ...props }, ref) => (
  <div
    ref={ref}
    className={cn(
      `fixed z-[40] flex flex-col-reverse gap-2 right-4 
      top-4 w-auto max-w-sm `, 
      className
    )}
    {...props}
  />
));

ToastViewport.displayName = "ToastViewport";

const toastVariants = cva(
  `group relative flex w-96 items-center justify-between overflow-hidden rounded-md border   p-4 pr-8 shadow-lg transition-all 
  bg-background text-foreground`,
  {
    variants: {
      variant: {
        default: "border bg-background text-foreground",
        destructive: "border-red-500 bg-red-100 text-red-800",
        success: "border-green-500 bg-green-100 text-green-800",
        warning: "border-yellow-500 bg-yellow-100 text-yellow-800",
        info: "border-blue-500 bg-blue-100 text-blue-800",
      },
    },
    defaultVariants: {
      variant: "default",
    },
  }
);

export interface ToastProps extends React.HTMLAttributes<HTMLDivElement> {
  variant?: "default" | "destructive" | "success" | "warning" | "info";
  duration?: number;
  onClose?: () => void;
}

const Toast = React.forwardRef<HTMLDivElement, ToastProps>(
  ({ className, variant = "default", duration = 5000, onClose, ...props }, ref) => {
    const [progress, setProgress] = React.useState(0);
    const [isOpen, setIsOpen] = React.useState(true);
    const intervalRef = React.useRef<ReturnType<typeof setInterval> | null>(null);

    React.useEffect(() => {
      if (!isOpen) return;
      
      const startTime = Date.now();
      const endTime = startTime + duration;

      if (intervalRef.current) clearInterval(intervalRef.current);

      setProgress(0);

      intervalRef.current = setInterval(() => {
        const now = Date.now();
        const timeLeft = Math.max(0, endTime - now);
        const newProgress = 100 - (timeLeft / duration) * 100;

        setProgress(newProgress);

        if (newProgress >= 100) {
          clearInterval(intervalRef.current!);
          setTimeout(() => {
            setIsOpen(false);
            onClose?.();
          }, 100);
        }
      }, 10);

      return () => {
        if (intervalRef.current) clearInterval(intervalRef.current);
      };
    }, [isOpen, duration, onClose]);

    if (!isOpen) return null;

    return (
      <div
        ref={ref}
        className={cn(
          toastVariants({ variant }), 
          "relative z-50 pb-2",  // Removed fixed positioning for better stacking
          className
        )}
        style={{ 
          marginBottom: '8px',  // Add spacing between toasts
          zIndex: 51  // Ensure proper stacking
        }}
        {...props}
      >
        <div className="w-full min-h-8">
          {props.children}
          {/* Bottom Progress Bar */}
          <div className="absolute bottom-0 left-0 right-0 h-1">
            <Progress 
              value={progress} 
              className="h-1 rounded-none"
              indicatorClassName={cn(
                variant === "destructive" ? "bg-red-600" : 
                variant === "success" ? "bg-green-600" : 
                variant === "warning" ? "bg-yellow-600" : 
                variant === "info" ? "bg-blue-600" : 
                "bg-gray-600"
              )}
            />
          </div>
        </div>

        {/* Close Button */}
        <ToastClose onClick={() => {
          setIsOpen(false);
          onClose?.();
        }} />
      </div>
    );
  }
);
Toast.displayName = "Toast";

const ToastClose = React.forwardRef<
  HTMLButtonElement,
  React.ButtonHTMLAttributes<HTMLButtonElement>
>(({ className, ...props }, ref) => (
  <button
    ref={ref}
    className={cn(
      "absolute right-2 top-2 rounded-md p-1 text-foreground/70 opacity-70 transition-opacity hover:text-foreground hover:opacity-100",
      className
    )}
    aria-label="Close toast"
    {...props}
  >
    <X className="h-4 w-4" />
  </button>
));
ToastClose.displayName = "ToastClose";

const ToastTitle = React.forwardRef<
  HTMLHeadingElement,
  React.HTMLAttributes<HTMLHeadingElement>
>(({ className, ...props }, ref) => (
  <h2
    ref={ref}
    className={cn("text-sm font-semibold", className)}
    {...props}
  />
));
ToastTitle.displayName = "ToastTitle";

const ToastDescription = React.forwardRef<
  HTMLParagraphElement,
  React.HTMLAttributes<HTMLParagraphElement>
>(({ className, ...props }, ref) => (
  <p
    ref={ref}
    className={cn("text-sm opacity-90", className)}
    {...props}
  />
));
ToastDescription.displayName = "ToastDescription";

export {
  ToastProvider,
  ToastViewport,
  Toast,
  ToastTitle,
  ToastDescription,
  ToastClose,
};