/**
 * Tom's Java Jive - Main JavaScript
 */

// ================================
// Toast Notifications
// ================================
const ToastManager = {
    container: null,
    
    init() {
        if (!this.container) {
            this.container = document.createElement('div');
            this.container.className = 'toast-container';
            document.body.appendChild(this.container);
        }
    },
    
    show(message, type = 'success', duration = 3000) {
        this.init();
        
        const toast = document.createElement('div');
        toast.className = `toast ${type}`;
        toast.innerHTML = `
            <i class="fas fa-${type === 'success' ? 'check-circle' : type === 'error' ? 'exclamation-circle' : 'info-circle'}"></i>
            <span>${message}</span>
        `;
        
        this.container.appendChild(toast);
        
        setTimeout(() => {
            toast.style.animation = 'slideIn 0.3s ease reverse';
            setTimeout(() => toast.remove(), 300);
        }, duration);
    },
    
    success(message) { this.show(message, 'success'); },
    error(message) { this.show(message, 'error'); },
    info(message) { this.show(message, 'info'); }
};

// ================================
// Cart Functions
// ================================
async function addToCart(productId, quantity = 1) {
    try {
        const response = await fetch('/api/cart.php', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                action: 'add',
                product_id: productId,
                quantity: parseInt(quantity)
            })
        });
        
        const data = await response.json();
        
        if (data.error) {
            ToastManager.error(data.error);
            return;
        }
        
        // Update cart count in header
        updateCartCount(data.cart_count);
        ToastManager.success(data.message || 'Added to cart!');
        
    } catch (error) {
        console.error('Add to cart error:', error);
        ToastManager.error('Failed to add item to cart');
    }
}

async function updateCartItem(productId, quantity) {
    try {
        const response = await fetch('/api/cart.php', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                action: 'update',
                product_id: productId,
                quantity: parseInt(quantity)
            })
        });
        
        const data = await response.json();
        
        if (data.error) {
            ToastManager.error(data.error);
            return;
        }
        
        // Update cart count
        updateCartCount(data.cart_count);
        
        // Reload page if cart is now empty or update display
        if (data.cart_count === 0) {
            location.reload();
        } else if (typeof updateCartDisplay === 'function') {
            updateCartDisplay(data);
        } else {
            location.reload();
        }
        
    } catch (error) {
        console.error('Update cart error:', error);
        ToastManager.error('Failed to update cart');
    }
}

async function removeFromCart(productId) {
    try {
        const response = await fetch('/api/cart.php', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                action: 'remove',
                product_id: productId
            })
        });
        
        const data = await response.json();
        
        if (data.error) {
            ToastManager.error(data.error);
            return;
        }
        
        updateCartCount(data.cart_count);
        
        // Remove item from DOM or reload
        const cartItem = document.querySelector(`.cart-item[data-product-id="${productId}"]`);
        if (cartItem) {
            cartItem.style.animation = 'slideIn 0.3s ease reverse';
            setTimeout(() => {
                cartItem.remove();
                if (data.cart_count === 0) {
                    location.reload();
                }
            }, 300);
        } else {
            location.reload();
        }
        
        ToastManager.success('Item removed from cart');
        
    } catch (error) {
        console.error('Remove from cart error:', error);
        ToastManager.error('Failed to remove item');
    }
}

function updateCartCount(count) {
    const cartCountEl = document.querySelector('.cart-count');
    if (cartCountEl) {
        if (count > 0) {
            cartCountEl.textContent = count;
            cartCountEl.style.display = 'flex';
        } else {
            cartCountEl.style.display = 'none';
        }
    } else if (count > 0) {
        const cartLink = document.querySelector('.cart-link');
        if (cartLink) {
            const badge = document.createElement('span');
            badge.className = 'cart-count';
            badge.textContent = count;
            cartLink.appendChild(badge);
        }
    }
}

// ================================
// Quantity Selectors
// ================================
document.addEventListener('DOMContentLoaded', function() {
    // Quantity +/- buttons
    document.querySelectorAll('.qty-minus').forEach(btn => {
        btn.addEventListener('click', function() {
            const input = this.closest('.quantity-selector').querySelector('.qty-input');
            const current = parseInt(input.value) || 1;
            if (current > 1) {
                input.value = current - 1;
                input.dispatchEvent(new Event('change'));
            }
        });
    });
    
    document.querySelectorAll('.qty-plus').forEach(btn => {
        btn.addEventListener('click', function() {
            const input = this.closest('.quantity-selector').querySelector('.qty-input');
            const current = parseInt(input.value) || 1;
            const max = parseInt(input.max) || 999;
            if (current < max) {
                input.value = current + 1;
                input.dispatchEvent(new Event('change'));
            }
        });
    });
    
    // Add to cart buttons
    document.querySelectorAll('.add-to-cart-btn').forEach(btn => {
        btn.addEventListener('click', function(e) {
            if (!this.dataset.productId) return;
            
            e.preventDefault();
            const productId = this.dataset.productId;
            const qtyInput = document.querySelector('.qty-input');
            const quantity = qtyInput ? parseInt(qtyInput.value) : 1;
            
            addToCart(productId, quantity);
        });
    });
    
    // Mobile menu toggle
    const menuToggle = document.querySelector('.mobile-menu-toggle');
    const navMenu = document.querySelector('.nav-menu');
    if (menuToggle && navMenu) {
        menuToggle.addEventListener('click', function() {
            navMenu.classList.toggle('active');
            this.querySelector('i').classList.toggle('fa-bars');
            this.querySelector('i').classList.toggle('fa-times');
        });
    }
    
    // Confirm delete dialogs
    document.querySelectorAll('[data-confirm]').forEach(el => {
        el.addEventListener('click', function(e) {
            if (!confirm(this.dataset.confirm)) {
                e.preventDefault();
            }
        });
    });
    
    // Auto-hide alerts
    document.querySelectorAll('.alert').forEach(alert => {
        setTimeout(() => {
            alert.style.opacity = '0';
            alert.style.transform = 'translateY(-10px)';
            setTimeout(() => alert.remove(), 300);
        }, 5000);
    });
});

// ================================
// Form Helpers
// ================================
function serializeForm(form) {
    const formData = new FormData(form);
    const data = {};
    formData.forEach((value, key) => {
        data[key] = value;
    });
    return data;
}

async function submitForm(form, url, method = 'POST') {
    const data = serializeForm(form);
    
    try {
        const response = await fetch(url, {
            method,
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        
        return await response.json();
    } catch (error) {
        console.error('Form submit error:', error);
        throw error;
    }
}

// ================================
// Format Helpers
// ================================
function formatCurrency(amount) {
    return '$' + parseFloat(amount).toFixed(2);
}

function formatDate(date) {
    return new Date(date).toLocaleDateString('en-US', {
        year: 'numeric',
        month: 'short',
        day: 'numeric'
    });
}

// ================================
// Loading States
// ================================
function setLoading(button, isLoading) {
    if (isLoading) {
        button.dataset.originalText = button.innerHTML;
        button.innerHTML = '<span class="loading"></span> Loading...';
        button.disabled = true;
    } else {
        button.innerHTML = button.dataset.originalText || button.innerHTML;
        button.disabled = false;
    }
}

// ================================
// Image Preview
// ================================
function previewImage(input, previewId) {
    const preview = document.getElementById(previewId);
    if (!preview) return;
    
    if (input.files && input.files[0]) {
        const reader = new FileReader();
        reader.onload = function(e) {
            preview.src = e.target.result;
            preview.style.display = 'block';
        };
        reader.readAsDataURL(input.files[0]);
    }
}

// ================================
// Newsletter Subscription
// ================================
document.querySelectorAll('.newsletter-form').forEach(form => {
    form.addEventListener('submit', async function(e) {
        e.preventDefault();
        
        const email = this.querySelector('input[type="email"]').value;
        const button = this.querySelector('button');
        
        setLoading(button, true);
        
        try {
            const response = await fetch('/api/subscribe.php', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ email })
            });
            
            const data = await response.json();
            
            if (data.error) {
                ToastManager.error(data.error);
            } else {
                ToastManager.success('Thank you for subscribing!');
                this.reset();
            }
        } catch (error) {
            ToastManager.error('Subscription failed. Please try again.');
        } finally {
            setLoading(button, false);
        }
    });
});

// ================================
// Debounce Helper
// ================================
function debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
        const later = () => {
            clearTimeout(timeout);
            func(...args);
        };
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    };
}

// ================================
// Local Storage Helpers
// ================================
const Storage = {
    get(key, defaultValue = null) {
        try {
            const item = localStorage.getItem(key);
            return item ? JSON.parse(item) : defaultValue;
        } catch {
            return defaultValue;
        }
    },
    
    set(key, value) {
        try {
            localStorage.setItem(key, JSON.stringify(value));
        } catch (e) {
            console.error('Storage error:', e);
        }
    },
    
    remove(key) {
        localStorage.removeItem(key);
    }
};