// Shared JavaScript across all pages
console.log('قالی شهاب - App loaded');

// Initialize Feather Icons
document.addEventListener('DOMContentLoaded', function() {
    if (typeof feather !== 'undefined') {
        feather.replace();
    }
});

// Mobile menu functionality
function toggleMobileMenu() {
    const mobileMenu = document.getElementById('mobile-menu');
    if (mobileMenu) {
        mobileMenu.classList.toggle('hidden');
    }
}

// Product filtering and search
function filterProducts(category = 'all') {
    const products = document.querySelectorAll('.product-item');
    products.forEach(product => {
        if (category === 'all' || product.dataset.category === category) {
            product.style.display = 'block';
        } else {
            product.style.display = 'none';
        }
    });
}

// Search functionality
function searchProducts(query) {
    const products = document.querySelectorAll('.product-item');
    products.forEach(product => {
        const title = product.querySelector('h3').textContent.toLowerCase();
        const description = product.querySelector('p').textContent.toLowerCase();
        const searchTerm = query.toLowerCase();
        
        if (title.includes(searchTerm) || description.includes(searchTerm)) {
            product.style.display = 'block';
        } else {
            product.style.display = 'none';
        }
    });
}

// Add to cart functionality
function addToCart(productId, productName, price) {
    let cart = JSON.parse(localStorage.getItem('cart')) || [];
    const existingItem = cart.find(item => item.id === productId);
    
    if (existingItem) {
        existingItem.quantity += 1;
    } else {
        cart.push({
            id: productId,
            name: productName,
            price: price,
            quantity: 1
        });
    }
    
    localStorage.setItem('cart', JSON.stringify(cart));
    updateCartCount();
    showNotification('محصول به سبد خرید اضافه شد');
}

// Update cart count in navbar
function updateCartCount() {
    const cart = JSON.parse(localStorage.getItem('cart')) || [];
    const totalItems = cart.reduce((sum, item) => sum + item.quantity, 0);
    const cartCountElements = document.querySelectorAll('.cart-count');
    
    cartCountElements.forEach(element => {
        element.textContent = totalItems;
        if (totalItems > 0) {
            element.classList.remove('hidden');
        } else {
            element.classList.add('hidden');
        }
    });
}

// Show notification
function showNotification(message) {
    const notification = document.createElement('div');
    notification.className = 'fixed top-4 left-4 bg-green-500 text-white px-6 py-3 rounded-lg shadow-lg z-50';
    notification.textContent = message;
    
    document.body.appendChild(notification);
    
    setTimeout(() => {
        notification.remove();
    }, 3000);
}

// Initialize cart count on page load
document.addEventListener('DOMContentLoaded', function() {
    updateCartCount();
});

// Form validation
function validateContactForm() {
    const name = document.getElementById('name').value;
    const email = document.getElementById('email').value;
    const message = document.getElementById('message').value;
    
    if (!name || !email || !message) {
        showNotification('لطفاً تمام فیلدهای ضروری را پر کنید');
        return false;
    }
    
    if (!isValidEmail(email)) {
        showNotification('لطفاً یک ایمیل معتبر وارد کنید');
        return false;
    }
    
    return true;
}

function isValidEmail(email) {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
}

// Image lazy loading
document.addEventListener('DOMContentLoaded', function() {
    const lazyImages = document.querySelectorAll('img[data-src]');
    
    const imageObserver = new IntersectionObserver((entries, observer) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const img = entry.target;
                img.src = img.dataset.src;
                img.removeAttribute('data-src');
                observer.unobserve(img);
            }
        });
    });
    
    lazyImages.forEach(img => imageObserver.observe(img));
});