'use client';

import { Button } from "@/components/ui/Button";
import { useAppDispatch, useAppSelector } from "@/lib/redux/hooks";
import { clearBox, selectBoxItems, selectEditingBoxGroupId } from "@/lib/redux/slices/boxSlice";
import { addItem, removeItem } from "components/cart/actions";
import { useCart } from "components/cart/cart-context";
import { Product, ProductVariant } from "lib/shopify/types";
import { useRouter } from "next/navigation";
import { useEffect, useState } from "react";

export function AddBoxToCartClient() {
  const [isLoading, setIsLoading] = useState(false);
  const [isLoadingProducts, setIsLoadingProducts] = useState(true);
  const [allProducts, setAllProducts] = useState<Product[]>([]);
  const [boxProducts, setBoxProducts] = useState<Product[]>([]);
  const items = useAppSelector(selectBoxItems);
  const editingBoxGroupId = useAppSelector(selectEditingBoxGroupId);
  const { addCartItem, cart } = useCart();
  const dispatch = useAppDispatch();
  const router = useRouter();

  // Fetch products on mount
  useEffect(() => {
    async function fetchProducts() {
      setIsLoadingProducts(true);
      try {
        // Fetch regular products
        const regularResponse = await fetch('/api/products');
        const regularData = await regularResponse.json();
        
        // Fetch box products
        const boxesResponse = await fetch('/api/products?type=boxes');
        const boxesData = await boxesResponse.json();
        
        if (regularData.products) setAllProducts(regularData.products);
        if (boxesData.products) setBoxProducts(boxesData.products);
      } catch (error) {
        console.error("Failed to fetch products:", error);
      } finally {
        setIsLoadingProducts(false);
      }
    }
    
    fetchProducts();
  }, []);

  // Check if we have a box
  const boxItems = items.filter(item => item.variantId === 'box-container');
  const productItems = items.filter(item => item.variantId !== 'box-container');
  
  const isEnabled = boxItems.length > 0 && !isLoadingProducts;

  const handleAddToCart = async () => {
    if (isLoading || !isEnabled) return;
    
    setIsLoading(true);
    
    try {
      // Save the current box state to localStorage for potential editing later
      try {
        const boxState = {
          boxItems: boxItems,
          productItems: productItems,
          boxGroupId: `box-${Date.now()}`
        };
        localStorage.setItem('lastBoxState', JSON.stringify(boxState));
      } catch (error) {
        console.error("Failed to save box state:", error);
      }
      
      // Generate a unique box ID to group all items together
      const boxGroupId = `box-${Date.now()}`;
      
      // Ako je ovo uređivanje postojećeg boxa, prvo ukloni stari box i sve njegove proizvode
      if (editingBoxGroupId && cart) {
        // Pronađi sve proizvode i kontejner koji pripadaju ovom boxu
        const itemsToRemove = cart.lines.filter(line => {
          const attrs = line.attributes || [];
          const itemBoxGroupId = attrs.find(attr => attr.key === 'box_group_id')?.value;
          return itemBoxGroupId === editingBoxGroupId;
        });
        
        // Ukloni sve pronađene proizvode
        for (const item of itemsToRemove) {
          if (item.id && item.merchandise.id) {
            await removeItem(null, item.merchandise.id, item.id);
          }
        }
      }
      
      // Add box items first
      for (const boxItem of boxItems) {
        // Find the actual box product from our pre-loaded products
        const boxProduct = boxProducts.find(p => p.id === boxItem.id);
        
        if (boxProduct) {
          // Get the variant to use
          const boxVariant = boxProduct.variants[0];
          
          if (boxVariant) {
            // Add box with attribute marking it as a box container and the box group ID
            await addItem(
              null, 
              boxVariant.id, 
              boxItem.quantity,
              [
                { key: "_box_type", value: "container" },
                { key: "_box_group_id", value: boxGroupId }
              ]
            );
            
            // Update local cart state
            addCartItem(boxVariant, boxProduct, boxItem.quantity);
          }
        }
      }
      
      // Add product items
      for (const productItem of productItems) {
        // Find the actual product from our pre-loaded products
        const product = allProducts.find(p => p.id === productItem.id);
        
        if (product) {
          // Find the variant
          let selectedVariant: ProductVariant | undefined;
          
          if (productItem.variantId && productItem.variantId !== 'undefined') {
            selectedVariant = product.variants.find(v => v.id === productItem.variantId);
          }
          
          // If no variant found, use the first one (exactly like AddToCartButton.tsx)
          if (!selectedVariant) {
            selectedVariant = product.variants[0];
          }
          
          if (selectedVariant && selectedVariant.id) {
            // Add product with attribute marking it as a box item and the box group ID
            await addItem(
              null, 
              selectedVariant.id, 
              productItem.quantity,
              [
                { key: "_box_type", value: "item" },
                { key: "_box_group_id", value: boxGroupId }
              ]
            );
            
            // Update local cart state
            addCartItem(selectedVariant, product, productItem.quantity);
          }
        }
      }
      
      dispatch(clearBox());
    } catch (error) {
      console.error("Failed to add box to cart:", error);
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <Button
      onClick={handleAddToCart}
      disabled={isLoading || !isEnabled}
      variant="primary"
      className="w-full py-3"
    >
      {isLoading ? "Dodaje se..." : isLoadingProducts ? "Učitavanje..." : "Dodaj u košaricu"}
    </Button>
  );
}