"use client";

import React, { useState, useEffect, useCallback, useRef } from "react";
import { Package, ShoppingBag, Info, ExternalLink, Loader2, AlertTriangle } from "lucide-react";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from "@/components/ui/tooltip";
import { getCookie } from "@/lib/api";
import axios from "axios";
import { useRouter } from "next/navigation";
import { cacheUtils } from "@/lib/api-client";

interface Order {
  _id: string;
  orderId: number;
  status: string;
  totalPrice: number;
  orderDate: string;
  products: Array<{
    productId: string;
    quantity: number;
    pricePerUnit: number;
    totalItemPrice: number;
  }>;
  underpaid?: boolean;
  underpaymentAmount?: number;
  lastBalanceReceived?: number;
  cryptoTotal?: number;
}

interface BuyerOrderInfoProps {
  buyerId: string;
  chatId: string;
}

export default function BuyerOrderInfo({ buyerId, chatId }: BuyerOrderInfoProps) {
  const router = useRouter();
  const [loading, setLoading] = useState(false);
  const [orders, setOrders] = useState<Order[]>([]);
  const [hasOrders, setHasOrders] = useState<boolean | null>(null);
  const [isTooltipOpen, setIsTooltipOpen] = useState(false);
  const lastFetchedRef = useRef<number>(0);
  const isFetchingRef = useRef<boolean>(false);
  const tooltipDelayRef = useRef<NodeJS.Timeout | null>(null);
  const [refreshTrigger, setRefreshTrigger] = useState(0);
  
  // Add order refresh subscription
  useEffect(() => {
    const unsubscribe = cacheUtils.onOrderRefresh(() => {
      console.log("Order refresh triggered in BuyerOrderInfo");
      setRefreshTrigger(prev => prev + 1);
    });

    return unsubscribe;
  }, []);
  
  // Fetch data without unnecessary dependencies to reduce render cycles
  const fetchBuyerOrders = useCallback(async (force = false) => {
    // Prevent multiple simultaneous fetches
    if (isFetchingRef.current) return;
    
    // Don't fetch if we already know there are no orders
    if (hasOrders === false && !force) return;
    
    // Don't fetch if we already have orders and data was fetched less than 10 seconds ago
    const now = Date.now();
    if (!force && !refreshTrigger && orders.length > 0 && now - lastFetchedRef.current < 10000) return;
    
    // Only continue if we have a chatId
    if (!chatId) return;
    
    isFetchingRef.current = true;
    setLoading(true);
    
    try {
      const authToken = getCookie("Authorization");
      
      if (!authToken) {
        console.error("No auth token found for buyer orders");
        setHasOrders(false);
        return;
      }
      
      const authAxios = axios.create({
        baseURL: process.env.NEXT_PUBLIC_API_URL,
        headers: {
          Authorization: `Bearer ${authToken}`
        }
      });
      
      // Use the new endpoint that works with sub-users
      const response = await authAxios.get(`/chats/${chatId}/orders?limit=10`); // Limit to fewer orders for faster response
      
      if (response.data && response.data.orders) {
        setOrders(response.data.orders);
        setHasOrders(response.data.orders.length > 0);
      } else {
        setHasOrders(false);
      }
      
      lastFetchedRef.current = Date.now();
    } catch (error: any) {
      console.error("Error fetching buyer orders:", error);
      
      if (error.response?.status === 404) {
        console.log("No orders found for this buyer");
        setOrders([]);
        setHasOrders(false);
      } else {
        console.error("API error:", error.response?.data || error.message);
        setHasOrders(null);
      }
    } finally {
      setLoading(false);
      isFetchingRef.current = false;
    }
  }, [chatId, refreshTrigger]); // Add refreshTrigger as dependency
  
  // Start fetching immediately when component mounts
  useEffect(() => {
    if (chatId) {
      // Immediately attempt to fetch in the background
      fetchBuyerOrders();
    }
    
    return () => {
      // Clean up any pending timeouts
      if (tooltipDelayRef.current) {
        clearTimeout(tooltipDelayRef.current);
      }
    };
  }, [chatId, fetchBuyerOrders]);
  
  const handleViewOrder = (orderId: string) => {
    router.push(`/dashboard/orders/${orderId}`);
  };
  
  // Handle hover with immediate tooltip opening
  const handleButtonMouseEnter = () => {
    // Start fetching data, but don't wait for it to complete
    if (!isFetchingRef.current) {
      queueMicrotask(() => {
        fetchBuyerOrders();
      });
    }
  };
  
  // Handle tooltip state change
  const handleTooltipOpenChange = (open: boolean) => {
    setIsTooltipOpen(open);
    if (open && !isFetchingRef.current) {
      queueMicrotask(() => {
        fetchBuyerOrders();
      });
    }
  };
  
  // Format the price as currency
  const formatPrice = (price: number) => {
    return `£${price.toFixed(2)}`;
  };
  
  // Helper function to check if order is underpaid (improved)
  const isOrderUnderpaid = (order: Order) => {
    return order.underpaid === true && 
           order.underpaymentAmount && 
           order.underpaymentAmount > 0 &&
           order.status !== "paid" &&
           order.status !== "completed" &&
           order.status !== "shipped" &&
           order.status !== "cancelled";
  };

  // Helper function to get underpaid percentage
  const getUnderpaidPercentage = (order: Order) => {
    if (!isOrderUnderpaid(order)) return 0;
    
    const received = order.lastBalanceReceived || 0;
    const required = order.cryptoTotal || 0;
    
    return required > 0 ? ((received / required) * 100) : 0;
  };
  
  // If we know there are no orders, don't show the component at all
  if (hasOrders === false) {
    return null;
  }
  
  // Precompute product count for button display (only if we have orders)
  const productCount = orders.length > 0 
    ? orders.reduce((total, order) => {
        return total + order.products.reduce((sum, product) => sum + product.quantity, 0);
      }, 0)
    : 0;
  
  return (
    <TooltipProvider>
      <Tooltip onOpenChange={handleTooltipOpenChange}>
        <TooltipTrigger asChild>
          <Button 
            variant="outline" 
            size="sm" 
            className="ml-2 flex items-center gap-1.5"
            onMouseEnter={handleButtonMouseEnter}
          >
            <ShoppingBag className="h-4 w-4" />
            <span className="text-xs font-medium">
              {orders.length > 0 ? `${orders.length} Orders` : "Orders"}
            </span>
            {productCount > 0 && (
              <Badge variant="secondary" className="text-[10px] px-1.5 py-0 ml-1">
                {productCount} items
              </Badge>
            )}
            {orders.some(order => isOrderUnderpaid(order)) && (
              <AlertTriangle className="h-3 w-3 text-red-500" />
            )}
          </Button>
        </TooltipTrigger>
        <TooltipContent side="left" className="p-0 max-w-xs">
          {loading ? (
            <div className="p-3 flex items-center gap-2">
              <Loader2 className="h-4 w-4 animate-spin" />
              <span className="text-sm">Loading orders...</span>
            </div>
          ) : orders.length === 0 ? (
            <div className="p-3">
              <span className="text-sm text-muted-foreground">No orders found</span>
            </div>
          ) : (
            <>
              <div className="p-3 border-b">
                <h4 className="font-medium text-sm">Customer Orders</h4>
                <p className="text-xs text-muted-foreground">
                  {orders.length} {orders.length === 1 ? 'order' : 'orders'} ÔÇó Total: {formatPrice(
                    orders.reduce((sum, order) => sum + order.totalPrice, 0)
                  )}
                </p>
              </div>
              
              <div className="max-h-64 overflow-y-auto divide-y divide-border">
                {orders.map((order) => (
                  <div 
                    key={order._id} 
                    className="px-3 py-2 hover:bg-accent/50 cursor-pointer"
                    onClick={() => handleViewOrder(order._id)}
                  >
                    <div className="flex items-center justify-between mb-1">
                      <div className="flex items-center gap-2">
                        <Package className="h-3.5 w-3.5" />
                        <span className="text-xs font-medium">Order #{order.orderId}</span>
                        {isOrderUnderpaid(order) && (
                          <AlertTriangle className="h-3 w-3 text-red-500" />
                        )}
                      </div>
                      <div className="flex items-center gap-1">
                        <Badge variant={
                          order.status === "paid" ? "paid" : 
                          order.status === "unpaid" ? "unpaid" :
                          order.status === "shipped" ? "shipped" :
                          order.status === "completed" ? "completed" :
                          "secondary"
                        } className="text-[10px] h-5 px-1.5">
                          {order.status.toUpperCase()}
                        </Badge>
                        {isOrderUnderpaid(order) && (
                          <Badge variant="destructive" className="text-[10px] h-5 px-1.5">
                            {getUnderpaidPercentage(order).toFixed(0)}% PAID
                          </Badge>
                        )}
                      </div>
                    </div>
                    
                    <div className="flex justify-between items-center text-xs text-muted-foreground pl-5">
                      <div className="flex gap-1">
                        <span>{order.products.length} {order.products.length === 1 ? 'product' : 'products'}</span>
                        <span>•</span>
                        <span>{formatPrice(order.totalPrice)}</span>
                        {isOrderUnderpaid(order) && (
                          <>
                            <span>•</span>
                            <span className="text-red-500">Underpaid</span>
                          </>
                        )}
                      </div>
                      <span className="text-[10px]">{new Date(order.orderDate).toLocaleDateString()}</span>
                    </div>
                  </div>
                ))}
              </div>
            </>
          )}
        </TooltipContent>
      </Tooltip>
    </TooltipProvider>
  );
}