// Configuration
const API_BASE_URL = 'https://bdwewiveuzpakrzphljo.supabase.co/functions/v1';
let API_KEY = '';
let cart = [];
let currentPage = 1;
let products = [];
let orders = [];

// Page Navigation
function showPage(pageId) {
    document.querySelectorAll('.page').forEach(page => page.classList.remove('active'));
    document.getElementById(pageId).classList.add('active');
    
    if (pageId === 'customer-page') {
        loadProducts();
        loadCategories();
    } else if (pageId === 'admin-page') {
        loadAdminProducts();
        loadAdminOrders();
    }
}

// Admin Login
function adminLogin(event) {
    event.preventDefault();
    const apiKey = document.getElementById('api-key-input').value;
    
    if (apiKey) {
        API_KEY = apiKey;
        showPage('admin-page');
    } else {
        alert('Please enter a valid API key');
    }
}

function logout() {
    API_KEY = '';
    showPage('landing-page');
}

// API Helper
async function apiRequest(endpoint, method = 'GET', body = null) {
    const options = {
        method,
        headers: {
            'Content-Type': 'application/json'
        }
    };
    
    if (API_KEY) {
        options.headers['x-api-key'] = API_KEY;
    }
    
    if (body) {
        options.body = JSON.stringify(body);
    }
    
    try {
        const response = await fetch(`${API_BASE_URL}${endpoint}`, options);
        if (!response.ok) {
            throw new Error(`API Error: ${response.statusText}`);
        }
        return await response.json();
    } catch (error) {
        console.error('API Request failed:', error);
        alert('Request failed: ' + error.message);
        throw error;
    }
}

// Customer Functions - Products
async function loadProducts(page = 1) {
    try {
        const search = document.getElementById('product-search').value;
        const category = document.getElementById('category-filter').value;
        
        let endpoint = `/products?page=${page}&limit=12`;
        if (search) endpoint += `&search=${encodeURIComponent(search)}`;
        if (category) endpoint += `&category=${encodeURIComponent(category)}`;
        
        const data = await apiRequest(endpoint);
        products = data.data || [];
        currentPage = page;
        
        renderProducts(products);
        renderPagination(data.total, data.page, data.limit);
    } catch (error) {
        document.getElementById('products-grid').innerHTML = 
            '<div class="empty-state">Failed to load products</div>';
    }
}

function renderProducts(products) {
    const grid = document.getElementById('products-grid');
    
    if (!products || products.length === 0) {
        grid.innerHTML = '<div class="empty-state"><div class="empty-state-icon">📦</div><p>No products found</p></div>';
        return;
    }
    
    grid.innerHTML = products.map(product => `
        <div class="product-card" onclick="showProductDetails('${product.id}')">
            <div class="product-image">
                ${product.variants?.[0]?.image_url ? 
                    `<img src="${product.variants[0].image_url}" alt="${product.name}">` : 
                    '👕'}
            </div>
            <div class="product-info">
                <h3 class="product-name">${product.name}</h3>
                <span class="product-category">${product.category || 'Uncategorized'}</span>
                <p class="product-description">${product.description || ''}</p>
                <div class="product-price">$${parseFloat(product.base_price).toFixed(2)}</div>
                ${product.variants?.length > 0 ? `<p class="mt-1">${product.variants.length} variants available</p>` : ''}
            </div>
        </div>
    `).join('');
}

function renderPagination(total, page, limit) {
    const pagination = document.getElementById('pagination');
    const totalPages = Math.ceil(total / limit);
    
    if (totalPages <= 1) {
        pagination.innerHTML = '';
        return;
    }
    
    let html = `<button onclick="loadProducts(${page - 1})" ${page <= 1 ? 'disabled' : ''}>Previous</button>`;
    
    for (let i = 1; i <= totalPages; i++) {
        if (i === 1 || i === totalPages || (i >= page - 1 && i <= page + 1)) {
            html += `<button onclick="loadProducts(${i})" ${i === page ? 'class="active"' : ''}>${i}</button>`;
        } else if (i === page - 2 || i === page + 2) {
            html += '<span>...</span>';
        }
    }
    
    html += `<button onclick="loadProducts(${page + 1})" ${page >= totalPages ? 'disabled' : ''}>Next</button>`;
    pagination.innerHTML = html;
}

async function loadCategories() {
    // Since the API doesn't have a categories endpoint, we'll populate from loaded products
    const categories = [...new Set(products.map(p => p.category).filter(Boolean))];
    const select = document.getElementById('category-filter');
    select.innerHTML = '<option value="">All Categories</option>' + 
        categories.map(cat => `<option value="${cat}">${cat}</option>`).join('');
}

function searchProducts() {
    clearTimeout(window.searchTimeout);
    window.searchTimeout = setTimeout(() => loadProducts(1), 500);
}

function filterProducts() {
    loadProducts(1);
}

async function showProductDetails(productId) {
    try {
        const product = await apiRequest(`/products/${productId}`);
        const modal = document.getElementById('product-modal');
        const details = document.getElementById('product-details');
        
        details.innerHTML = `
            <h2>${product.name}</h2>
            <span class="product-category">${product.category || 'Uncategorized'}</span>
            <p class="mt-2">${product.description || 'No description'}</p>
            <div class="product-price mt-2">$${parseFloat(product.base_price).toFixed(2)}</div>
            
            ${product.variants?.length > 0 ? `
                <div class="product-variants mt-3">
                    <h4>Select Variant:</h4>
                    <div class="variant-options">
                        ${product.variants.map(variant => `
                            <button class="variant-btn ${variant.stock_quantity === 0 ? 'out-of-stock' : ''}" 
                                    onclick="addToCart('${product.id}', '${variant.id}')"
                                    ${variant.stock_quantity === 0 ? 'disabled' : ''}>
                                ${variant.size || ''} ${variant.color || ''}
                                ${variant.price_override ? `($${parseFloat(variant.price_override).toFixed(2)})` : ''}
                                ${variant.stock_quantity === 0 ? '(Out of Stock)' : `(${variant.stock_quantity} available)`}
                            </button>
                        `).join('')}
                    </div>
                </div>
            ` : '<p class="mt-2">No variants available</p>'}
        `;
        
        modal.classList.add('active');
    } catch (error) {
        alert('Failed to load product details');
    }
}

// Cart Functions
function addToCart(productId, variantId) {
    const product = products.find(p => p.id === productId);
    if (!product) return;
    
    const variant = product.variants.find(v => v.id === variantId);
    if (!variant || variant.stock_quantity === 0) return;
    
    const existingItem = cart.find(item => item.variantId === variantId);
    
    if (existingItem) {
        if (existingItem.quantity < variant.stock_quantity) {
            existingItem.quantity++;
        } else {
            alert('Cannot add more than available stock');
            return;
        }
    } else {
        cart.push({
            productId: product.id,
            variantId: variant.id,
            productName: product.name,
            variantLabel: `${variant.size || ''} ${variant.color || ''}`.trim(),
            price: variant.price_override || product.base_price,
            quantity: 1,
            maxStock: variant.stock_quantity
        });
    }
    
    updateCartCount();
    closeModal('product-modal');
    alert('Added to cart!');
}

function updateCartCount() {
    const count = cart.reduce((sum, item) => sum + item.quantity, 0);
    document.getElementById('cart-count').textContent = count;
}

function showCart() {
    const modal = document.getElementById('cart-modal');
    const cartItems = document.getElementById('cart-items');
    
    if (cart.length === 0) {
        cartItems.innerHTML = '<div class="empty-state"><div class="empty-state-icon">🛒</div><p>Your cart is empty</p></div>';
    } else {
        cartItems.innerHTML = '<div class="cart-items">' + cart.map((item, index) => `
            <div class="cart-item">
                <div class="cart-item-info">
                    <div class="cart-item-name">${item.productName}</div>
                    <div class="cart-item-variant">${item.variantLabel}</div>
                    <div class="cart-item-quantity">
                        <button class="quantity-btn" onclick="updateCartQuantity(${index}, -1)">-</button>
                        <span>${item.quantity}</span>
                        <button class="quantity-btn" onclick="updateCartQuantity(${index}, 1)">+</button>
                        <button class="btn btn-danger" onclick="removeFromCart(${index})">Remove</button>
                    </div>
                </div>
                <div class="cart-item-price">$${(item.price * item.quantity).toFixed(2)}</div>
            </div>
        `).join('') + '</div>';
    }
    
    const subtotal = cart.reduce((sum, item) => sum + (item.price * item.quantity), 0);
    document.getElementById('cart-subtotal').textContent = `$${subtotal.toFixed(2)}`;
    
    modal.classList.add('active');
}

function updateCartQuantity(index, delta) {
    const item = cart[index];
    const newQuantity = item.quantity + delta;
    
    if (newQuantity <= 0) {
        removeFromCart(index);
    } else if (newQuantity <= item.maxStock) {
        item.quantity = newQuantity;
        updateCartCount();
        showCart();
    } else {
        alert('Cannot add more than available stock');
    }
}

function removeFromCart(index) {
    cart.splice(index, 1);
    updateCartCount();
    showCart();
}

// Checkout
function showCheckout() {
    if (cart.length === 0) {
        alert('Your cart is empty');
        return;
    }
    
    closeModal('cart-modal');
    const modal = document.getElementById('checkout-modal');
    
    const subtotal = cart.reduce((sum, item) => sum + (item.price * item.quantity), 0);
    const shippingFee = 10;
    const total = subtotal + shippingFee;
    
    document.getElementById('checkout-subtotal').textContent = `$${subtotal.toFixed(2)}`;
    document.getElementById('checkout-total').textContent = `$${total.toFixed(2)}`;
    
    modal.classList.add('active');
}

async function placeOrder(event) {
    event.preventDefault();
    
    const orderData = {
        customer_name: document.getElementById('customer-name').value,
        customer_email: document.getElementById('customer-email').value,
        customer_phone: document.getElementById('customer-phone').value,
        shipping_address: {
            address: document.getElementById('shipping-address').value
        },
        shipping_fee: 10,
        notes: document.getElementById('order-notes').value,
        items: cart.map(item => ({
            variant_id: item.variantId,
            quantity: item.quantity
        }))
    };
    
    try {
        const result = await apiRequest('/orders', 'POST', orderData);
        
        alert(`Order placed successfully! Your tracking ID is: ${result.tracking_id || 'N/A'}`);
        
        cart = [];
        updateCartCount();
        closeModal('checkout-modal');
        
        // Reset form
        document.getElementById('customer-name').value = '';
        document.getElementById('customer-email').value = '';
        document.getElementById('customer-phone').value = '';
        document.getElementById('shipping-address').value = '';
        document.getElementById('order-notes').value = '';
    } catch (error) {
        alert('Failed to place order: ' + error.message);
    }
}

// Order Tracking
async function trackOrder() {
    const trackingId = document.getElementById('tracking-input').value.trim();
    
    if (!trackingId) {
        alert('Please enter a tracking ID');
        return;
    }
    
    try {
        const data = await apiRequest(`/orders/track/${trackingId}`);
        
        const modal = document.getElementById('tracking-modal');
        const result = document.getElementById('tracking-result');
        
        result.innerHTML = `
            <div class="mt-2">
                <p><strong>Tracking ID:</strong> ${data.tracking_id}</p>
                <p><strong>Status:</strong> <span class="status-badge status-${data.status}">${data.status}</span></p>
                <p><strong>Customer:</strong> ${data.customer_name}</p>
                <p><strong>Order Date:</strong> ${new Date(data.created_at).toLocaleDateString()}</p>
                <h3 class="mt-3">Items:</h3>
                <ul>
                    ${data.items_summary?.map(item => `<li>${item}</li>`).join('') || '<li>No items</li>'}
                </ul>
            </div>
        `;
        
        modal.classList.add('active');
    } catch (error) {
        alert('Order not found or tracking ID is invalid');
    }
}

// Admin Functions - Products
async function loadAdminProducts() {
    try {
        const data = await apiRequest('/products?limit=100');
        products = data.data || [];
        renderAdminProducts(products);
    } catch (error) {
        document.getElementById('admin-products-list').innerHTML = 
            '<div class="empty-state">Failed to load products</div>';
    }
}

function renderAdminProducts(products) {
    const list = document.getElementById('admin-products-list');
    
    if (!products || products.length === 0) {
        list.innerHTML = '<div class="empty-state"><div class="empty-state-icon">📦</div><p>No products found</p></div>';
        return;
    }
    
    list.innerHTML = products.map(product => `
        <div class="admin-item">
            <div class="admin-item-info">
                <div class="admin-item-title">${product.name}</div>
                <div class="admin-item-meta">
                    ${product.category || 'Uncategorized'} • $${parseFloat(product.base_price).toFixed(2)} • 
                    ${product.variants?.length || 0} variants • 
                    ${product.is_active ? '✅ Active' : '❌ Inactive'}
                </div>
            </div>
            <div class="admin-item-actions">
                <button class="btn btn-primary" onclick="editProduct('${product.id}')">Edit</button>
                <button class="btn btn-secondary" onclick="manageVariants('${product.id}')">Variants</button>
                <button class="btn btn-danger" onclick="deleteProduct('${product.id}')">Delete</button>
            </div>
        </div>
    `).join('');
}

function searchAdminProducts() {
    const search = document.getElementById('admin-product-search').value.toLowerCase();
    const filtered = products.filter(p => 
        p.name.toLowerCase().includes(search) || 
        (p.category || '').toLowerCase().includes(search)
    );
    renderAdminProducts(filtered);
}

function showProductModal(productId = null) {
    const modal = document.getElementById('admin-product-modal');
    const title = document.getElementById('product-modal-title');
    
    if (productId) {
        title.textContent = 'Edit Product';
        const product = products.find(p => p.id === productId);
        if (product) {
            document.getElementById('edit-product-id').value = product.id;
            document.getElementById('product-name').value = product.name;
            document.getElementById('product-description').value = product.description || '';
            document.getElementById('product-price').value = product.base_price;
            document.getElementById('product-category').value = product.category || '';
            document.getElementById('product-active').checked = product.is_active;
        }
    } else {
        title.textContent = 'Add Product';
        document.getElementById('edit-product-id').value = '';
        document.getElementById('product-name').value = '';
        document.getElementById('product-description').value = '';
        document.getElementById('product-price').value = '';
        document.getElementById('product-category').value = '';
        document.getElementById('product-active').checked = true;
    }
    
    modal.classList.add('active');
}

function editProduct(productId) {
    showProductModal(productId);
}

async function saveProduct(event) {
    event.preventDefault();
    
    const productId = document.getElementById('edit-product-id').value;
    const productData = {
        name: document.getElementById('product-name').value,
        description: document.getElementById('product-description').value,
        base_price: parseFloat(document.getElementById('product-price').value),
        category: document.getElementById('product-category').value,
        is_active: document.getElementById('product-active').checked
    };
    
    try {
        if (productId) {
            await apiRequest(`/products/${productId}`, 'PUT', productData);
            alert('Product updated successfully!');
        } else {
            await apiRequest('/products', 'POST', productData);
            alert('Product created successfully!');
        }
        
        closeModal('admin-product-modal');
        loadAdminProducts();
    } catch (error) {
        alert('Failed to save product: ' + error.message);
    }
}

async function deleteProduct(productId) {
    if (!confirm('Are you sure you want to delete this product?')) return;
    
    try {
        await apiRequest(`/products/${productId}`, 'DELETE');
        alert('Product deleted successfully!');
        loadAdminProducts();
    } catch (error) {
        alert('Failed to delete product: ' + error.message);
    }
}

function manageVariants(productId) {
    alert('Variant management feature: Coming soon!\n\nUse the API directly to manage variants for now:\nPOST /variants/' + productId);
}

// Admin Functions - Orders
async function loadAdminOrders() {
    try {
        const data = await apiRequest('/orders?limit=100');
        orders = data.data || [];
        renderAdminOrders(orders);
    } catch (error) {
        document.getElementById('admin-orders-list').innerHTML = 
            '<div class="empty-state">Failed to load orders</div>';
    }
}

function renderAdminOrders(orders) {
    const list = document.getElementById('admin-orders-list');
    
    if (!orders || orders.length === 0) {
        list.innerHTML = '<div class="empty-state"><div class="empty-state-icon">📋</div><p>No orders found</p></div>';
        return;
    }
    
    list.innerHTML = orders.map(order => `
        <div class="admin-item">
            <div class="admin-item-info">
                <div class="admin-item-title">Order #${order.tracking_id || order.id.substring(0, 8)}</div>
                <div class="admin-item-meta">
                    ${order.customer_name} • ${order.customer_email || order.customer_phone} • 
                    ${order.items?.length || 0} items • 
                    $${parseFloat(order.total).toFixed(2)} • 
                    ${new Date(order.created_at).toLocaleDateString()}
                </div>
                <div class="mt-1">
                    <span class="status-badge status-${order.delivery_status}">${order.delivery_status}</span>
                </div>
            </div>
            <div class="admin-item-actions">
                <select onchange="updateOrderStatus('${order.id}', this.value)" class="input">
                    <option value="">Change Status</option>
                    <option value="pending">Pending</option>
                    <option value="processing">Processing</option>
                    <option value="shipped">Shipped</option>
                    <option value="delivered">Delivered</option>
                    <option value="cancelled">Cancelled</option>
                </select>
                <button class="btn btn-primary" onclick="viewOrderDetails('${order.id}')">View</button>
            </div>
        </div>
    `).join('');
}

function searchAdminOrders() {
    const search = document.getElementById('admin-order-search').value.toLowerCase();
    const filtered = orders.filter(o => 
        o.customer_name.toLowerCase().includes(search) || 
        (o.customer_email || '').toLowerCase().includes(search) ||
        (o.tracking_id || '').toLowerCase().includes(search)
    );
    renderAdminOrders(filtered);
}

function filterOrders() {
    const status = document.getElementById('order-status-filter').value;
    const filtered = status ? orders.filter(o => o.delivery_status === status) : orders;
    renderAdminOrders(filtered);
}

async function updateOrderStatus(orderId, newStatus) {
    if (!newStatus) return;
    
    try {
        await apiRequest(`/orders/${orderId}`, 'PATCH', { delivery_status: newStatus });
        alert('Order status updated successfully!');
        loadAdminOrders();
    } catch (error) {
        alert('Failed to update order status: ' + error.message);
    }
}

function viewOrderDetails(orderId) {
    const order = orders.find(o => o.id === orderId);
    if (!order) return;
    
    const items = order.items?.map(item => 
        `${item.product_name} (${item.variant_label}) x${item.quantity} - $${(item.unit_price * item.quantity).toFixed(2)}`
    ).join('\n') || 'No items';
    
    alert(`Order Details:\n\nTracking ID: ${order.tracking_id}\nCustomer: ${order.customer_name}\nEmail: ${order.customer_email || 'N/A'}\nPhone: ${order.customer_phone}\nStatus: ${order.delivery_status}\n\nItems:\n${items}\n\nSubtotal: $${parseFloat(order.subtotal).toFixed(2)}\nShipping: $${parseFloat(order.shipping_fee).toFixed(2)}\nTotal: $${parseFloat(order.total).toFixed(2)}`);
}

// Admin Tab Navigation
function showAdminTab(tabName) {
    document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.remove('active'));
    document.querySelectorAll('.admin-tab').forEach(tab => tab.classList.remove('active'));
    
    event.target.classList.add('active');
    document.getElementById(`admin-${tabName}`).classList.add('active');
    
    if (tabName === 'products') {
        loadAdminProducts();
    } else if (tabName === 'orders') {
        loadAdminOrders();
    }
}

// Modal Functions
function closeModal(modalId) {
    document.getElementById(modalId).classList.remove('active');
}

// Close modals when clicking outside
window.onclick = function(event) {
    if (event.target.classList.contains('modal')) {
        event.target.classList.remove('active');
    }
}

// Initialize
document.addEventListener('DOMContentLoaded', () => {
    updateCartCount();
});