// Search Functionality

// Search data structure (in production, this would come from a server)
const searchData = {
    pages: [
        { title: '关于实验室', url: 'website.html#about', content: 'DAEL Design AI Ecology Lab 跨学科研究平台' },
        { title: '研究方向', url: 'website.html#research', content: '生成式生态学 生物启发式智能 数字可持续性' },
        { title: '研究团队', url: 'website.html#team', content: 'Dr. Lin Chen Sarah Wu James Zhao Yu Zhang' },
        { title: '新闻资讯', url: 'news.html', content: '最新资讯 最新文章 热点文章' },
        { title: '成果展示', url: 'publications.html', content: '专著教材 文章目录 软件开发 学位论文' },
        { title: '资源下载', url: 'resources.html', content: '软件下载 资料下载 开源代码' },
        { title: '学术资料', url: 'academic.html', content: '软件使用 教程 文档' }
    ],
    news: [],
    publications: [],
    resources: []
};

// Simple search function
function performSearch(query) {
    if (!query || query.trim().length === 0) {
        return [];
    }

    const lowerQuery = query.toLowerCase().trim();
    const results = [];

    // Search in pages
    searchData.pages.forEach(page => {
        const titleMatch = page.title.toLowerCase().includes(lowerQuery);
        const contentMatch = page.content.toLowerCase().includes(lowerQuery);
        
        if (titleMatch || contentMatch) {
            results.push({
                type: 'page',
                title: page.title,
                url: page.url,
                snippet: page.content.substring(0, 100) + '...'
            });
        }
    });

    return results;
}

// Initialize search
function initSearch() {
    const searchInput = document.getElementById('search-input');
    const searchResults = document.getElementById('search-results');
    const searchForm = document.getElementById('search-form');

    if (!searchInput || !searchResults) return;

    // Real-time search
    let searchTimeout;
    searchInput.addEventListener('input', (e) => {
        clearTimeout(searchTimeout);
        const query = e.target.value.trim();

        if (query.length === 0) {
            searchResults.classList.remove('active');
            searchResults.innerHTML = '';
            return;
        }

        searchTimeout = setTimeout(() => {
            const results = performSearch(query);
            displaySearchResults(results, searchResults);
        }, 300);
    });

    // Handle form submission
    if (searchForm) {
        searchForm.addEventListener('submit', (e) => {
            e.preventDefault();
            const query = searchInput.value.trim();
            if (query) {
                window.location.href = `search.html?q=${encodeURIComponent(query)}`;
            }
        });
    }

    // Close search results when clicking outside
    document.addEventListener('click', (e) => {
        if (!searchInput.contains(e.target) && !searchResults.contains(e.target)) {
            searchResults.classList.remove('active');
        }
    });
}

// Display search results
function displaySearchResults(results, container) {
    if (results.length === 0) {
        container.innerHTML = '<div class="search-result-item text-gray-500 text-center py-4">未找到相关结果</div>';
        container.classList.add('active');
        return;
    }

    container.innerHTML = results.map(result => `
        <a href="${result.url}" class="search-result-item block">
            <div class="font-semibold text-sm mb-1">${result.title}</div>
            <div class="text-xs text-gray-500">${result.snippet}</div>
        </a>
    `).join('');

    container.classList.add('active');
}

// Get search query from URL
function getSearchQuery() {
    const params = new URLSearchParams(window.location.search);
    return params.get('q') || '';
}

// Initialize on page load
document.addEventListener('DOMContentLoaded', () => {
    initSearch();
    
    // If on search page, perform search
    if (window.location.pathname.includes('search.html')) {
        const query = getSearchQuery();
        const searchInput = document.getElementById('search-input');
        const resultsContainer = document.getElementById('search-results-container');
        
        if (query && searchInput) {
            searchInput.value = query;
        }
        
        if (query && resultsContainer) {
            const results = performSearch(query);
            displaySearchResults(results, resultsContainer);
        }
    }
});