// User Authentication Functions

let currentUser = null;

// Check if user is logged in
async function isLoggedIn() {
    try {
        const response = await window.DAELAPI.auth.checkAuth();
        if (response.authenticated) {
            currentUser = response.user;
            return true;
        }
        return false;
    } catch (error) {
        return false;
    }
}

// Get current user
function getCurrentUser() {
    return currentUser;
}

// Login function
async function login(username, password, remember = false) {
    try {
        const response = await window.DAELAPI.auth.login(username, password, remember);
        currentUser = response.user;
        return true;
    } catch (error) {
        console.error('Login failed:', error);
        return false;
    }
}

// Logout function
async function logout() {
    try {
        await window.DAELAPI.auth.logout();
        currentUser = null;
        window.location.href = 'website.html';
    } catch (error) {
        console.error('Logout failed:', error);
        // 即使API失败也清除本地状态
        currentUser = null;
        window.location.href = 'website.html';
    }
}

// Check protected content access
async function checkProtectedContent() {
    const loggedIn = await isLoggedIn();
    const protectedElements = document.querySelectorAll('.protected-content');
    
    if (loggedIn) {
        protectedElements.forEach(el => {
            el.classList.remove('protected-content');
        });
        
        // 加载受保护内容
        try {
            const response = await window.DAELAPI.api.getProtectedContent();
            displayProtectedContent(response);
        } catch (error) {
            console.error('Failed to load protected content:', error);
        }
    } else {
        protectedElements.forEach(el => {
            el.classList.add('protected-content');
        });
    }
}

// 显示受保护内容
async function displayProtectedContent(data) {
    // 更新受保护的文章
    const protectedArticlesContainer = document.getElementById('protected-articles');
    if (protectedArticlesContainer && data.articles && data.articles.length > 0) {
        protectedArticlesContainer.innerHTML = data.articles.map(article => `
            <div class="border-b border-gray-200 pb-6 mb-6">
                <h3 class="text-xl font-bold mb-2">${article.title}</h3>
                <p class="text-gray-500 text-sm mb-2">${article.summary || article.content.substring(0, 100) + '...'}</p>
                <div class="text-xs text-gray-400">${new Date(article.created_at).toLocaleDateString()}</div>
            </div>
        `).join('');
        protectedArticlesContainer.classList.remove('hidden');
    }
    
    // 更新受保护的资源
    const protectedResourcesContainer = document.getElementById('protected-resources');
    if (protectedResourcesContainer && data.resources && data.resources.length > 0) {
        protectedResourcesContainer.innerHTML = data.resources.map(resource => `
            <div class="border border-gray-200 p-4 mb-4">
                <h4 class="font-bold mb-2">${resource.name}</h4>
                <p class="text-sm text-gray-500 mb-2">${resource.description || ''}</p>
                <p class="text-xs text-gray-400 mb-2">大小: ${(resource.file_size / 1024 / 1024).toFixed(2)} MB</p>
                <button onclick="window.DAELAPI.api.downloadResource(${resource.id})" 
                        class="text-sm text-black border-b border-black hover:text-gray-600">
                    下载 ->
                </button>
            </div>
        `).join('');
        protectedResourcesContainer.classList.remove('hidden');
    }
    
    // 更新统计信息
    try {
        const statsResponse = await window.DAELAPI.api.getStats();
        const stats = statsResponse.stats;
        const statsContainer = document.getElementById('protected-stats');
        if (statsContainer) {
            const statElements = statsContainer.querySelectorAll('.text-3xl');
            if (statElements.length >= 4) {
                statElements[0].textContent = stats.articles || '0';
                statElements[1].textContent = stats.resources || '0';
                statElements[2].textContent = stats.team_members || '0';
                statElements[3].textContent = stats.total_downloads || '0';
            }
        }
    } catch (error) {
        console.error('Failed to load stats:', error);
    }
}

// Initialize auth on page load
document.addEventListener('DOMContentLoaded', async () => {
    // 等待API加载
    if (typeof window.DAELAPI === 'undefined') {
        console.warn('API not loaded, using fallback authentication');
        // 使用本地存储作为后备
        const localAuth = localStorage.getItem('dael_user_logged_in') === 'true';
        updateUI(localAuth);
        return;
    }
    
    await checkProtectedContent();
    await updateAuthUI();
    
    // Logout button handler
    const logoutBtn = document.getElementById('logout-btn');
    if (logoutBtn) {
        logoutBtn.addEventListener('click', async (e) => {
            e.preventDefault();
            if (confirm('确定要退出登录吗？')) {
                await logout();
            }
        });
    }
});

// 更新认证UI
async function updateAuthUI() {
    const loggedIn = await isLoggedIn();
    const loginBtn = document.getElementById('login-btn');
    const logoutBtn = document.getElementById('logout-btn');
    const adminBtn = document.getElementById('admin-btn');
    const meetingsLink = document.getElementById('meetings-link');
    const researchLink = document.getElementById('research-link');
    const userInfo = document.getElementById('user-info');
    
    if (loggedIn) {
        const user = getCurrentUser();
        if (loginBtn) loginBtn.classList.add('hidden');
        if (logoutBtn) logoutBtn.classList.remove('hidden');
        if (adminBtn && user && user.is_admin) {
            adminBtn.classList.remove('hidden');
        } else if (adminBtn) {
            adminBtn.classList.add('hidden');
        }
        // 显示组会和研究管理链接（所有登录用户）
        if (meetingsLink) meetingsLink.classList.remove('hidden');
        if (researchLink) researchLink.classList.remove('hidden');
        const mobileMeetingsLink = document.getElementById('mobile-meetings-link');
        const mobileResearchLink = document.getElementById('mobile-research-link');
        if (mobileMeetingsLink) mobileMeetingsLink.classList.remove('hidden');
        if (mobileResearchLink) mobileResearchLink.classList.remove('hidden');
        if (userInfo && user) {
            userInfo.textContent = user.username;
            userInfo.classList.remove('hidden');
        }
    } else {
        if (loginBtn) loginBtn.classList.remove('hidden');
        if (logoutBtn) logoutBtn.classList.add('hidden');
        if (adminBtn) adminBtn.classList.add('hidden');
        if (meetingsLink) meetingsLink.classList.add('hidden');
        if (researchLink) researchLink.classList.add('hidden');
        const mobileMeetingsLink = document.getElementById('mobile-meetings-link');
        const mobileResearchLink = document.getElementById('mobile-research-link');
        if (mobileMeetingsLink) mobileMeetingsLink.classList.add('hidden');
        if (mobileResearchLink) mobileResearchLink.classList.add('hidden');
        if (userInfo) userInfo.classList.add('hidden');
    }
}

// 后备UI更新函数
function updateUI(loggedIn) {
    const loginBtn = document.getElementById('login-btn');
    const logoutBtn = document.getElementById('logout-btn');
    
    if (loggedIn) {
        if (loginBtn) loginBtn.classList.add('hidden');
        if (logoutBtn) logoutBtn.classList.remove('hidden');
    } else {
        if (loginBtn) loginBtn.classList.remove('hidden');
        if (logoutBtn) logoutBtn.classList.add('hidden');
    }
}