/**
 * PerToolBox Front - 公共 JavaScript
 */

// ========== 全局变量 ==========
let currentUser = null;

// ========== 工具函数 ==========
function getToken() {
    return localStorage.getItem('token');
}

function setToken(token) {
    if (token) {
        localStorage.setItem('token', token);
    } else {
        localStorage.removeItem('token');
    }
}

function isLoggedIn() {
    return !!getToken();
}

// ========== API 请求封装 ==========
async function apiRequest(endpoint, options = {}) {
    const baseUrl = window.API_BASE || '/api/v1';
    const url = endpoint.startsWith('http') ? endpoint : `${baseUrl}${endpoint}`;
    
    // 默认 headers
    const headers = {
        ...options.headers
    };
    
    // 如果没有设置 Content-Type 且 body 是 URLSearchParams，不自动添加
    if (!options.headers || !options.headers['Content-Type']) {
        if (options.body && options.body instanceof URLSearchParams) {
            // 表单数据，不添加 JSON Content-Type
            headers['Content-Type'] = 'application/x-www-form-urlencoded';
        } else if (options.body && typeof options.body === 'string') {
            // 已经是字符串，不添加
        } else if (options.body && typeof options.body === 'object') {
            // JSON 对象
            headers['Content-Type'] = 'application/json';
            options.body = JSON.stringify(options.body);
        }
    }
    
    const token = getToken();
    if (token) {
        headers['Authorization'] = `Bearer ${token}`;
    }
    
    try {
        const response = await fetch(url, {
            ...options,
            headers
        });
        
        if (response.status === 401) {
            setToken(null);
            if (!window.location.pathname.includes('/login.php')) {
                window.location.href = '/login.php';
            }
            return null;
        }
        
        // 获取响应文本
        const text = await response.text();
        
        if (!response.ok) {
            let errorMsg;
            try {
                const errorData = JSON.parse(text);
                errorMsg = errorData.detail || errorData.message || JSON.stringify(errorData);
            } catch (e) {
                errorMsg = text || '请求失败';
            }
            throw new Error(errorMsg);
        }
        
        try {
            return JSON.parse(text);
        } catch (e) {
            return text;
        }
    } catch (error) {
        console.error('API 请求错误:', error);
        throw error;
    }
}

// ========== 热度上报 ==========
async function recordUsage(toolName) {
    try {
        await apiRequest(`/tool/usage?tool_name=${toolName}`, { method: 'POST' });
        console.log(`✅ 热度上报: ${toolName}`);
    } catch (error) {
        console.warn('热度上报失败:', error);
    }
}

// ========== 获取用户信息 ==========
async function loadUserInfo() {
    if (!isLoggedIn()) {
        updateUserUI(null);
        return null;
    }
    
    try {
        const user = await apiRequest('/user/profile');
        currentUser = user;
        updateUserUI(user);
        return user;
    } catch (error) {
        console.error('获取用户信息失败:', error);
        setToken(null);
        updateUserUI(null);
        return null;
    }
}

// ========== 更新侧边栏 UI ==========
function updateUserUI(user) {
    const userInfoDiv = document.getElementById('userInfo');
    const profileLink = document.getElementById('profileLink');
    const logoutBtn = document.getElementById('logoutBtn');
    const loginLink = document.getElementById('loginLink');
    
    if (user) {
        const displayName = user.username || user.phone || user.email || '用户';
        if (userInfoDiv) {
            userInfoDiv.innerHTML = `
                <div class="px-6 py-3 bg-blue-800 rounded-lg mx-4 mb-2">
                    <div class="text-sm text-blue-200">欢迎，</div>
                    <div class="font-semibold">${escapeHtml(displayName)}</div>
                </div>
            `;
        }
        if (profileLink) profileLink.style.display = 'flex';
        if (logoutBtn) logoutBtn.style.display = 'flex';
        if (loginLink) loginLink.style.display = 'none';
    } else {
        if (userInfoDiv) userInfoDiv.innerHTML = '';
        if (profileLink) profileLink.style.display = 'none';
        if (logoutBtn) logoutBtn.style.display = 'none';
        if (loginLink) loginLink.style.display = 'flex';
    }
}

// ========== 退出登录 ==========
function logout() {
    setToken(null);
    currentUser = null;
    updateUserUI(null);
    window.location.href = '/';
}

// ========== 侧边栏控制 ==========
function initSidebar() {
    const menuBtn = document.getElementById('menuBtn');
    const closeBtn = document.getElementById('closeSidebar');
    const sidebar = document.getElementById('sidebar');
    const overlay = document.getElementById('overlay');
    
    function openSidebar() {
        if (sidebar) sidebar.classList.add('open');
        if (overlay) overlay.classList.add('active');
        document.body.style.overflow = 'hidden';
    }
    
    function closeSidebar() {
        if (sidebar) sidebar.classList.remove('open');
        if (overlay) overlay.classList.remove('active');
        document.body.style.overflow = '';
    }
    
    if (menuBtn) menuBtn.addEventListener('click', openSidebar);
    if (closeBtn) closeBtn.addEventListener('click', closeSidebar);
    if (overlay) overlay.addEventListener('click', closeSidebar);
}

// ========== HTML 转义 ==========
function escapeHtml(text) {
    if (!text) return '';
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

// ========== 显示 Toast 消息 ==========
function showToast(message, type = 'success') {
    const toast = document.createElement('div');
    toast.className = `fixed bottom-4 right-4 z-50 px-4 py-2 rounded-lg shadow-lg text-white ${
        type === 'success' ? 'bg-green-500' : 'bg-red-500'
    }`;
    toast.textContent = message;
    document.body.appendChild(toast);
    setTimeout(() => toast.remove(), 3000);
}

// ========== 页面初始化 ==========
document.addEventListener('DOMContentLoaded', () => {
    initSidebar();
    loadUserInfo();
    
    const logoutBtn = document.getElementById('logoutBtn');
    if (logoutBtn) {
        logoutBtn.addEventListener('click', (e) => {
            e.preventDefault();
            logout();
        });
    }
});