/**
 * 商家后台通用脚本
 * 提供侧边栏、加载状态、交互反馈等功能
 */

// 侧边栏HTML模板
function getSidebarHTML(activePage) {
    const menuItems = [
        { href: '/merchant/dashboard.html', icon: 'bi-speedometer2', text: '首页', page: 'dashboard' },
        { href: '/merchant/products.html', icon: 'bi-box-seam', text: '商品管理', page: 'products' },
        { href: '/merchant/orders.html', icon: 'bi-receipt-cutoff', text: '订单管理', page: 'orders' },
        { href: '/merchant/inventory.html', icon: 'bi-archive', text: '库存管理', page: 'inventory' },
        { href: '/merchant/statistics.html', icon: 'bi-bar-chart', text: '数据统计', page: 'statistics' },
        { href: '/merchant/announcements.html', icon: 'bi-megaphone', text: '公告管理', page: 'announcements' },
        { href: '/merchant/messages.html', icon: 'bi-chat-dots', text: '留言管理', page: 'messages' },
        { href: '/merchant/reviews.html', icon: 'bi-star', text: '评价管理', page: 'reviews' },
        { href: '/merchant/users.html', icon: 'bi-people', text: '用户管理', page: 'users' }
    ];
    
    const menuHTML = menuItems.map(item => {
        const activeClass = item.page === activePage ? 'active' : '';
        return `
            <li class="nav-item">
                <a class="nav-link ${activeClass}" href="${item.href}" data-page="${item.page}">
                    <i class="bi ${item.icon}"></i>
                    <span class="nav-text">${item.text}</span>
                </a>
            </li>
        `;
    }).join('');
    
    return `
        <div class="sidebar" id="sidebar">
            <div class="sidebar-header">
                <div class="d-flex align-items-center">
                    <i class="bi bi-shop fs-4 me-2"></i>
                    <span class="sidebar-brand">商家后台</span>
                </div>
                <button class="btn btn-link text-white p-0 d-md-none" id="sidebarCloseBtn">
                    <i class="bi bi-x-lg"></i>
                </button>
            </div>
            <nav class="sidebar-nav">
                <ul class="nav flex-column">
                    ${menuHTML}
                </ul>
            </nav>
            <div class="sidebar-footer">
                <a href="/merchant/logout" class="btn btn-outline-light w-100">
                    <i class="bi bi-box-arrow-right"></i>
                    <span class="ms-2">退出登录</span>
                </a>
            </div>
        </div>
        <div class="sidebar-overlay" id="sidebarOverlay"></div>
        <nav class="top-navbar d-md-none">
            <div class="container-fluid d-flex align-items-center">
                <button class="btn btn-link text-white p-0" id="sidebarToggleBtn">
                    <i class="bi bi-list fs-4"></i>
                </button>
                <span class="ms-3 text-white fw-bold">商家后台</span>
            </div>
        </nav>
    `;
}

// 侧边栏CSS样式
const sidebarCSS = `
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 260px;
        height: 100vh;
        background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
        color: #fff;
        z-index: 1050;
        display: flex;
        flex-direction: column;
        transition: transform 0.3s ease;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    }
    .sidebar-header {
        padding: 1.5rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .sidebar-brand {
        font-size: 1.25rem;
        font-weight: 600;
    }
    .sidebar-nav {
        flex: 1;
        overflow-y: auto;
        padding: 1rem 0;
    }
    .sidebar-nav .nav-link {
        color: rgba(255, 255, 255, 0.8);
        padding: 0.75rem 1.5rem;
        transition: all 0.3s;
        border-left: 3px solid transparent;
        display: flex;
        align-items: center;
        text-decoration: none;
    }
    .sidebar-nav .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.1);
        color: #fff;
        border-left-color: #0d6efd;
    }
    .sidebar-nav .nav-link.active {
        background-color: rgba(13, 110, 253, 0.2);
        color: #fff;
        border-left-color: #0d6efd;
        font-weight: 600;
    }
    .sidebar-nav .nav-link i {
        width: 24px;
        font-size: 1.1rem;
        margin-right: 0.75rem;
    }
    .sidebar-nav .nav-text {
        flex: 1;
    }
    .sidebar-footer {
        padding: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    @media (max-width: 767.98px) {
        .sidebar {
            transform: translateX(-100%);
        }
        .sidebar.show {
            transform: translateX(0);
        }
        .sidebar-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1049;
            display: none;
            transition: opacity 0.3s;
        }
        .sidebar-overlay.show {
            display: block;
        }
        .top-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 56px;
            background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
            z-index: 1048;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        body {
            padding-top: 56px;
        }
    }
    @media (min-width: 768px) {
        .main-content {
            margin-left: 260px;
            min-height: 100vh;
        }
    }
    .sidebar-nav::-webkit-scrollbar {
        width: 6px;
    }
    .sidebar-nav::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.05);
    }
    .sidebar-nav::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.2);
        border-radius: 3px;
    }
    .sidebar-nav::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 255, 255, 0.3);
    }
`;

// 初始化侧边栏
function initSidebar(activePage) {
    // 添加CSS样式
    if (!document.getElementById('merchant-sidebar-styles')) {
        const style = document.createElement('style');
        style.id = 'merchant-sidebar-styles';
        style.textContent = sidebarCSS;
        document.head.appendChild(style);
    }
    
    // 替换导航栏
    const oldNav = document.querySelector('nav.navbar');
    if (oldNav) {
        oldNav.outerHTML = getSidebarHTML(activePage);
        
        // 初始化交互
        const sidebar = document.getElementById('sidebar');
        const sidebarOverlay = document.getElementById('sidebarOverlay');
        const sidebarToggleBtn = document.getElementById('sidebarToggleBtn');
        const sidebarCloseBtn = document.getElementById('sidebarCloseBtn');
        
        if (sidebarToggleBtn) {
            sidebarToggleBtn.addEventListener('click', function() {
                sidebar.classList.add('show');
                sidebarOverlay.classList.add('show');
                document.body.style.overflow = 'hidden';
            });
        }
        
        function closeSidebar() {
            sidebar.classList.remove('show');
            sidebarOverlay.classList.remove('show');
            document.body.style.overflow = '';
        }
        
        if (sidebarCloseBtn) {
            sidebarCloseBtn.addEventListener('click', closeSidebar);
        }
        
        if (sidebarOverlay) {
            sidebarOverlay.addEventListener('click', closeSidebar);
        }
        
        const navLinks = document.querySelectorAll('.sidebar-nav .nav-link');
        navLinks.forEach(link => {
            link.addEventListener('click', function() {
                if (window.innerWidth < 768) {
                    closeSidebar();
                }
            });
        });
    }
    
    // 包装主内容区域
    const container = document.querySelector('.container, .container-fluid');
    if (container && !container.closest('.main-content')) {
        const mainContent = document.createElement('div');
        mainContent.className = 'main-content';
        container.parentNode.insertBefore(mainContent, container);
        mainContent.appendChild(container);
    }
}

// 显示加载状态
function showLoading(elementId, message = '加载中...') {
    const element = document.getElementById(elementId);
    if (element) {
        element.innerHTML = `
            <div class="text-center py-5">
                <div class="spinner-border text-primary" role="status">
                    <span class="visually-hidden">${message}</span>
                </div>
                <p class="text-muted mt-3">${message}</p>
            </div>
        `;
    }
}

// 显示成功提示
function showSuccess(message, duration = 3000) {
    const toast = document.createElement('div');
    toast.className = 'toast align-items-center text-white bg-success border-0';
    toast.setAttribute('role', 'alert');
    toast.innerHTML = `
        <div class="d-flex">
            <div class="toast-body">${message}</div>
            <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
        </div>
    `;
    
    const toastContainer = document.getElementById('toastContainer') || createToastContainer();
    toastContainer.appendChild(toast);
    
    const bsToast = new bootstrap.Toast(toast);
    bsToast.show();
    
    toast.addEventListener('hidden.bs.toast', () => toast.remove());
}

// 显示错误提示
function showError(message, duration = 3000) {
    const toast = document.createElement('div');
    toast.className = 'toast align-items-center text-white bg-danger border-0';
    toast.setAttribute('role', 'alert');
    toast.innerHTML = `
        <div class="d-flex">
            <div class="toast-body">${message}</div>
            <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
        </div>
    `;
    
    const toastContainer = document.getElementById('toastContainer') || createToastContainer();
    toastContainer.appendChild(toast);
    
    const bsToast = new bootstrap.Toast(toast);
    bsToast.show();
    
    toast.addEventListener('hidden.bs.toast', () => toast.remove());
}

// 创建Toast容器
function createToastContainer() {
    const container = document.createElement('div');
    container.id = 'toastContainer';
    container.className = 'toast-container position-fixed top-0 end-0 p-3';
    container.style.zIndex = '1060';
    document.body.appendChild(container);
    return container;
}

// 检测当前页面
function detectCurrentPage() {
    const path = window.location.pathname;
    if (path.includes('products')) return 'products';
    if (path.includes('orders')) return 'orders';
    if (path.includes('inventory')) return 'inventory';
    if (path.includes('statistics')) return 'statistics';
    if (path.includes('announcements')) return 'announcements';
    if (path.includes('messages')) return 'messages';
    if (path.includes('reviews')) return 'reviews';
    if (path.includes('users')) return 'users';
    return 'dashboard';
}

// 自动初始化
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', function() {
        initSidebar(detectCurrentPage());
    });
} else {
    initSidebar(detectCurrentPage());
}