qty shouldn't be larger than selectedSize.qty (if there is any size) or selectedColor.qty (if there is any color)
disable the plus sign...
also if the qty is 0, show out of stock for selected size or selected color.
'use client';

import React, { useState, useEffect, useCallback, useMemo } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { Minus, Plus, ShoppingCart } from 'lucide-react';
import { useNotification } from '@/components/NotificationContext';
import '@/components/NotificationStyles.css';
import Link from 'next/link';

const formatPrice = (price) => {
    if (price == null || price === Infinity) return 'N/A';
    const formattedPrice = price >= 10000 ? price.toLocaleString() : price.toString();
    return `${formattedPrice} IQD`;
};

const ProductModal = ({ isOpen, onClose, productData }) => {
    const [selectedSize, setSelectedSize] = useState(null);
    const [quantity, setQuantity] = useState(1);
    const [isInCart, setIsInCart] = useState(false);
    const { addNotification } = useNotification();

    const product = productData.product;

    // Compute total price dynamically
    const totalPrice = useMemo(() => {
        return selectedSize ? parseFloat(selectedSize.price) * quantity : 0;
    }, [selectedSize, quantity]);

    // Check if the product is in the cart
    const checkIfInCart = useCallback(() => {
        try {
            const cart = JSON.parse(localStorage.getItem('cart')) || [];
            const isItemInCart = cart.some(
                (item) =>
                    item.product_id === product.id &&
                    item.size_id === selectedSize?.id
            );
            setIsInCart(isItemInCart);
        } catch (error) {
            console.error('Error accessing localStorage:', error);
            setIsInCart(false);
        }
    }, [product.id, selectedSize]);

    // Set default selected size on product change
    useEffect(() => {
        if (product?.sizes?.length > 0) {
            setSelectedSize(product.sizes[0]);
        }
    }, [product]);

    // Check if the product is in the cart whenever selectedSize changes
    useEffect(() => {
        checkIfInCart();
    }, [selectedSize, checkIfInCart]);

    // Handle adding product to cart
    const handleAddToCart = useCallback(() => {
        if (!selectedSize) return;

        const cartItem = {
            product_id: product.id,
            size_id: selectedSize.id,
            qty: quantity,
            price: selectedSize.price,
        };

        try {
            const cart = JSON.parse(localStorage.getItem('cart')) || [];
            const existingItemIndex = cart.findIndex(
                (item) =>
                    item.product_id === cartItem.product_id &&
                    item.size_id === cartItem.size_id
            );

            if (existingItemIndex > -1) {
                cart[existingItemIndex].qty += quantity;
            } else {
                cart.push(cartItem);
            }

            localStorage.setItem('cart', JSON.stringify(cart));
            setIsInCart(true);
            addNotification('success', 'Added to cart successfully');
        } catch (error) {
            console.error('Error updating cart:', error);
            addNotification('error', 'Failed to add to cart');
        }
    }, [product.id, selectedSize, quantity, addNotification]);

    if (!isOpen || !product) return null;

    return (
        <AnimatePresence>
            <motion.div
                initial={{ opacity: 0 }}
                animate={{ opacity: 1 }}
                exit={{ opacity: 0 }}
                className="fixed inset-0 bg-black bg-opacity-30 flex items-end justify-center z-50"
                onClick={onClose}
                aria-modal="true"
                role="dialog"
            >
                <motion.div
                    initial={{ y: '100%' }}
                    animate={{ y: 0 }}
                    exit={{ y: '100%' }}
                    transition={{ type: 'spring', damping: 25, stiffness: 500 }}
                    className="bg-white rounded-t-3xl w-full p-6 relative"
                    onClick={(e) => e.stopPropagation()}
                >
                    <div className="w-9 h-1 bg-[#00003C] opacity-70 rounded-full mx-auto mb-6" />

                    <h2 className="text-xl mb-4 font-sans">{product.name}</h2>

                    {product.has_size && (
                        <div className="mb-4">
                            <label htmlFor="size-select" className="sr-only">
                                Select Size
                            </label>
                            <select
                                id="size-select"
                                value={selectedSize ? selectedSize.id : ''}
                                onChange={(e) =>
                                    setSelectedSize(
                                        product.sizes.find(
                                            (size) => size.id.toString() === e.target.value
                                        )
                                    )
                                }
                                className="w-44 p-2 border border-[rgba(105,92,92,0.5)] rounded-lg font-serif text-lg focus:outline-none focus:ring-2 focus:ring-blue-500"
                            >
                                <option value="" disabled>
                                    Select a Size
                                </option>
                                {product.sizes.map((size) => (
                                    <option key={size.id} value={size.id}>
                                        {size.name}
                                    </option>
                                ))}
                            </select>
                            {!selectedSize && (
                                <p className="text-[#C91C1C] text-xs mt-2 font-sans">
                                    Please choose Size
                                </p>
                            )}
                        </div>
                    )}

                    {product.has_color && product.colors && product.colors.length > 0 && (
                        <div className="mb-6">
                            <h3 className="text-xl font-medium mb-2 font-sans">Color</h3>
                            <div className="flex space-x-5 mb-2">
                                {product.colors.map((color) => (
                                    <button
                                        key={color.id}
                                        className={`w-20 h-20 rounded-full border-2 ${
                                            selectedSize && selectedSize.color_id === color.id
                                                ? 'border-[rgba(105,92,92,0.5)]'
                                                : 'border-transparent'
                                        } flex items-center justify-center focus:outline-none focus:ring-2 focus:ring-blue-500`}
                                        aria-label={`Select color ${color.name}`}
                                        onClick={() => {
                                            // Assuming color selection affects selectedSize
                                            // If not, consider adding a separate state for selectedColor
                                        }}
                                    >
                                        <div
                                            className="w-15 h-15 rounded-full"
                                            style={{ backgroundColor: color.hex }}
                                        />
                                    </button>
                                ))}
                            </div>
                            <div className="flex justify-between px-2">
                                {product.colors.map((color) => (
                                    <span key={color.id} className="text-sm font-serif">
                                        {color.name}
                                    </span>
                                ))}
                            </div>
                        </div>
                    )}

                    <div className="flex font-serif justify-between items-center mb-6">
                        <p className="text-lg font-medium">{formatPrice(totalPrice)}</p>
                        <div className="flex items-center space-x-4">
                            <button
                                className="w-8 h-8 rounded-full border border-gray-300 flex items-center justify-center focus:outline-none focus:ring-2 focus:ring-blue-500 disabled:opacity-50"
                                onClick={() => setQuantity((prev) => Math.max(1, prev - 1))}
                                disabled={quantity <= 1}
                                aria-label="Decrease quantity"
                            >
                                <Minus className="w-4 h-4 text-[#3B5345]" />
                            </button>
                            <span className="text-lg">{quantity}</span>
                            <button
                                className="w-8 h-8 rounded-full border border-gray-300 flex items-center justify-center focus:outline-none focus:ring-2 focus:ring-blue-500"
                                onClick={() => setQuantity((prev) => prev + 1)}
                                aria-label="Increase quantity"
                            >
                                <Plus className="w-4 h-4 text-[#3B5345]" />
                            </button>
                        </div>
                    </div>

                    <div className="flex font-serif space-x-4">
                        {isInCart ? (
                            <Link
                                href="/cart"
                                prefetch={false}
                                className="flex-1 font-serif bg-[rgba(59,83,69,0.05)] text-[#3B5345] py-3 rounded-lg font-medium text-base md:text-lg flex items-center justify-center transition duration-300 border border-[#3B5345] hover:bg-[rgba(59,83,69,0.1)]"
                            >
                                <ShoppingCart className="mr-2" />
                                Buy Now
                            </Link>
                        ) : (
                            <button
                                className={`flex-1 ${
                                    selectedSize
                                        ? 'bg-[#3B5345] text-white hover:bg-[#2d4233]'
                                        : 'bg-gray-300 text-gray-500 cursor-not-allowed'
                                } py-3 rounded-lg font-medium text-base md:text-lg flex items-center justify-center transition duration-300`}
                                onClick={handleAddToCart}
                                disabled={!selectedSize}
                                aria-label="Add to cart"
                            >
                                <ShoppingCart className="mr-2" />
                                Add To Cart
                            </button>
                        )}
                        <button
                            className="flex-1 bg-gray-200 text-gray-800 py-3 rounded-lg font-medium text-base md:text-lg hover:bg-gray-300 transition duration-300"
                            onClick={onClose}
                            aria-label="Close modal"
                        >
                            Close
                        </button>
                    </div>
                </motion.div>
            </motion.div>
        </AnimatePresence>
    );
};

export default React.memo(ProductModal);