"use client";

import { useEffect, useState, useRef } from "react";
import { clientFetch } from "@/lib/api";
import { toast } from "sonner";
import { Package, Bell } from "lucide-react";
import { useRouter } from "next/navigation";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";

interface Order {
  _id: string;
  orderId: string;
  status: string;
  totalPrice: number;
  orderDate: string;
  items?: Array<{ name: string; quantity: number }>;
  customerName?: string;
}

export default function OrderNotifications() {
  const router = useRouter();
  const [newOrders, setNewOrders] = useState<Order[]>([]);
  const [loading, setLoading] = useState(true);
  const seenOrderIds = useRef<Set<string>>(new Set());
  const isInitialFetch = useRef(true);
  const audioRef = useRef<HTMLAudioElement | null>(null);

  useEffect(() => {
    audioRef.current = new Audio('/hohoho.mp3');
    
    // Fallback if hohoho.mp3 doesn't exist
    audioRef.current.addEventListener('error', () => {
      audioRef.current = null;
    });
    
    return () => {
      if (audioRef.current) {
        audioRef.current = null;
      }
    };
  }, []);
  
  // Function to play notification sound
  const playNotificationSound = () => {
    if (audioRef.current) {
      audioRef.current.currentTime = 0;
      const playPromise = audioRef.current.play();
      if (playPromise !== undefined) {
        playPromise.catch(err => {
          console.log('Error playing sound:', err);
          // Fallback to simple beep if audio file fails
          try {
            const context = new (window.AudioContext || (window as any).webkitAudioContext)();
            const oscillator = context.createOscillator();
            oscillator.type = 'sine';
            oscillator.frequency.setValueAtTime(800, context.currentTime);
            oscillator.connect(context.destination);
            oscillator.start();
            oscillator.stop(context.currentTime + 0.2);
          } catch (e) {
            console.error('Could not play fallback audio', e);
          }
        });
      }
    }
  };

  useEffect(() => {
    // Only run this on dashboard pages
    if (typeof window === 'undefined' || !window.location.pathname.includes("/dashboard")) return;

    const checkForNewOrders = async () => {
      try {
        // Get orders from the last 24 hours with a more efficient query
        const yesterday = new Date();
        yesterday.setDate(yesterday.getDate() - 1);
        const timestamp = yesterday.toISOString();
        
        // Use orderDate parameter instead of 'after' to avoid backend casting errors
        // The error logs show that the 'after' parameter is being interpreted as 'orderId' incorrectly
        const orderData = await clientFetch(`/orders?status=paid&limit=10&orderDate[gte]=${timestamp}`);
        const orders: Order[] = orderData.orders || [];

        // If this is the first fetch, just store the orders without notifications
        if (isInitialFetch.current) {
          orders.forEach(order => seenOrderIds.current.add(order._id));
          isInitialFetch.current = false;
          setLoading(false);
          return;
        }

        // Check for new paid orders that haven't been seen before
        const latestNewOrders = orders.filter(order => !seenOrderIds.current.has(order._id));
        
        // Show notifications for new orders
        if (latestNewOrders.length > 0) {
          // Update the seen orders set
          latestNewOrders.forEach(order => seenOrderIds.current.add(order._id));
          
          // Show a notification for each new order
          latestNewOrders.forEach(order => {
            toast.success(
              <div className="flex flex-col">
                <p className="font-semibold">New Paid Order!</p>
                <p className="text-sm">Order #{order.orderId}</p>
                <p className="text-sm font-semibold">£{order.totalPrice.toFixed(2)}</p>
              </div>,
              {
                duration: 8000,
                icon: <Package className="h-5 w-5" />,
                action: {
                  label: "View",
                  onClick: () => window.open(`/dashboard/orders/${order._id}`, "_blank")
                }
              }
            );
          });
          
          // Play notification sound
          playNotificationSound();
          
          // Update the state with new orders for the dropdown
          setNewOrders(prev => [...latestNewOrders, ...prev].slice(0, 10));
        }

        setLoading(false);
      } catch (error) {
        console.error("Error checking for new orders:", error);
        setLoading(false);
      }
    };

    // Check immediately on component mount (with a small delay)
    const initialTimeout = setTimeout(() => {
      checkForNewOrders();
    }, 2000);

    // Set up polling interval (every 60 seconds)
    const interval = setInterval(checkForNewOrders, 60000);

    // Clean up
    return () => {
      clearTimeout(initialTimeout);
      clearInterval(interval);
    };
  }, []);

  const handleOrderClick = (orderId: string) => {
    router.push(`/dashboard/orders/${orderId}`);
  };

  const clearNotifications = () => {
    setNewOrders([]);
  };

  // Format the price as currency
  const formatPrice = (price: number) => {
    return `£${price.toFixed(2)}`;
  };

  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="ghost" size="icon" className="relative" disabled={loading}>
          <Package className="h-5 w-5" />
          {newOrders.length > 0 && (
            <Badge 
              variant="destructive" 
              className="absolute -top-1 -right-1 px-1.5 py-0.5 text-xs"
            >
              {newOrders.length}
            </Badge>
          )}
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end" className="w-72">
        <div className="p-2 border-b flex justify-between items-center">
          <h3 className="font-medium">New Paid Orders</h3>
          {newOrders.length > 0 && (
            <Button 
              variant="ghost" 
              size="sm" 
              onClick={clearNotifications}
              className="h-7 text-xs"
            >
              Clear
            </Button>
          )}
        </div>
        
        {newOrders.length === 0 ? (
          <div className="p-4 flex items-center justify-center">
            <p className="text-sm text-muted-foreground">No new paid orders</p>
          </div>
        ) : (
          <>
            <div className="max-h-80 overflow-y-auto">
              {newOrders.map((order) => (
                <DropdownMenuItem 
                  key={order._id} 
                  className="p-3 cursor-pointer"
                  onClick={() => handleOrderClick(order._id)}
                >
                  <div className="flex items-center justify-between w-full">
                    <div>
                      <p className="font-medium">Order #{order.orderId}</p>
                      <p className="text-sm text-muted-foreground">
                        {formatPrice(order.totalPrice)}
                      </p>
                    </div>
                    <Badge className="bg-green-500 hover:bg-green-600">Paid</Badge>
                  </div>
                </DropdownMenuItem>
              ))}
            </div>
            <div className="p-2 border-t">
              <Button 
                variant="outline" 
                className="w-full"
                onClick={() => router.push('/dashboard/orders')}
              >
                View All Orders
              </Button>
            </div>
          </>
        )}
      </DropdownMenuContent>
    </DropdownMenu>
  );
} 