// 导航组件 - 统一管理所有页面的导航栏
(function() {
    // 检测当前页面路径，自动调整链接
    const currentPath = window.location.pathname;
    const isInPagesFolder = currentPath.includes('/pages/');
    const currentPage = currentPath.split('/').pop() || 'index.html';
    
    // 导航项配置
    const navItems = [
        { href: 'index.html', icon: 'fa-home', text: '首页', id: 'index' },
        { href: 'overview.html', icon: 'fa-info-circle', text: '展会概览', id: 'overview' },
        { href: 'exhibition.html', icon: 'fa-th-large', text: '展览内容', id: 'exhibition' },
        { href: 'marketing.html', icon: 'fa-bullhorn', text: '营销推广', id: 'marketing' },
        { href: 'operation.html', icon: 'fa-cogs', text: '运营服务', id: 'operation' },
        { href: 'budget.html', icon: 'fa-chart-pie', text: '预算分析', id: 'budget' },
        { href: 'risk.html', icon: 'fa-shield-alt', text: '风险评估', id: 'risk' }
    ];
    
    // 根据当前页面位置调整路径
    function getCorrectPath(href) {
        if (href === 'index.html') {
            return isInPagesFolder ? '../index.html' : 'index.html';
        } else {
            return isInPagesFolder ? href : `pages/${href}`;
        }
    }
    
    // 判断是否为当前激活页面
    function isActive(href) {
        return currentPage === href || 
               (currentPage === '' && href === 'index.html');
    }
    
    // 生成导航HTML
    function generateNavHTML() {
        return `
        <div class="container mx-auto px-6 py-4">
            <div class="flex items-center justify-between">
                <div class="flex items-center fade-in-left">
                    <div class="w-10 h-10 bg-gradient-to-br from-emerald-400 to-blue-500 rounded-lg flex items-center justify-center mr-3">
                        <i class="fas fa-charging-station text-white"></i>
                    </div>
                    <div>
                        <h1 class="text-lg font-bold">NEVIT 2024</h1>
                        <p class="text-xs text-gray-500">新能源汽车产业博览会</p>
                    </div>
                </div>
                <div class="hidden md:flex space-x-8">
                    ${navItems.map(item => `
                        <a href="${getCorrectPath(item.href)}" 
                           class="nav-link ${isActive(item.href) ? 'active' : ''} text-gray-700 hover:text-emerald-500 transition-colors"
                           data-nav="${item.id}">
                            <i class="fas ${item.icon} mr-2"></i>${item.text}
                        </a>
                    `).join('')}
                </div>
                <button class="md:hidden" id="mobile-menu-button">
                    <i class="fas fa-bars text-2xl text-gray-700"></i>
                </button>
            </div>
        </div>
        
        <!-- Mobile Menu -->
        <div class="hidden md:hidden fixed top-16 left-0 w-full bg-white shadow-lg" id="mobile-menu">
            <div class="px-6 py-4 space-y-3">
                ${navItems.map(item => `
                    <a href="${getCorrectPath(item.href)}" 
                       class="block py-2 px-4 rounded ${isActive(item.href) ? 'bg-emerald-50 text-emerald-500' : 'text-gray-700 hover:bg-gray-50'}"
                       data-nav="${item.id}">
                        <i class="fas ${item.icon} mr-2"></i>${item.text}
                    </a>
                `).join('')}
            </div>
        </div>`;
    }
    
    // 初始化导航
    function initNav() {
        const navElement = document.querySelector('nav') || document.getElementById('navbar');
        if (navElement) {
            // 保留原有的class和id
            const originalClasses = navElement.className;
            const originalId = navElement.id;
            
            // 更新导航内容
            navElement.innerHTML = generateNavHTML();
            
            // 恢复原有属性
            if (originalClasses) navElement.className = originalClasses;
            if (originalId) navElement.id = originalId;
            
            // 添加移动端菜单交互
            const mobileMenuButton = document.getElementById('mobile-menu-button');
            const mobileMenu = document.getElementById('mobile-menu');
            
            if (mobileMenuButton && mobileMenu) {
                mobileMenuButton.addEventListener('click', () => {
                    mobileMenu.classList.toggle('hidden');
                });
                
                // 点击菜单项后关闭移动端菜单
                mobileMenu.querySelectorAll('a').forEach(link => {
                    link.addEventListener('click', () => {
                        mobileMenu.classList.add('hidden');
                    });
                });
            }
            
            // 添加滚动效果
            let lastScrollTop = 0;
            window.addEventListener('scroll', () => {
                const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
                
                if (scrollTop > lastScrollTop && scrollTop > 100) {
                    // 向下滚动 - 隐藏导航
                    navElement.style.transform = 'translateY(-100%)';
                } else {
                    // 向上滚动 - 显示导航
                    navElement.style.transform = 'translateY(0)';
                }
                
                // 添加背景效果
                if (scrollTop > 50) {
                    navElement.classList.add('bg-white/95', 'backdrop-blur-md');
                } else {
                    navElement.classList.remove('bg-white/95', 'backdrop-blur-md');
                }
                
                lastScrollTop = scrollTop;
            });
        }
    }
    
    // DOM加载完成后初始化
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', initNav);
    } else {
        initNav();
    }
})();