// 全局变量
let currentPage = 'dashboard';
let currentNodesPage = 1;
let currentResultsPage = 1;
let currentNotificationsPage = 1;

// API基础URL
const API_BASE = '/api';

// 页面加载完成后初始化
document.addEventListener('DOMContentLoaded', function() {
    initializeApp();
});

// 初始化应用
async function initializeApp() {
    try {
        // 设置导航事件
        setupNavigation();
        
        // 加载仪表板数据
        await loadDashboard();
        
        // 设置定时刷新
        setInterval(loadDashboard, 30000); // 每30秒刷新一次
        
        console.log('应用初始化完成');
    } catch (error) {
        console.error('应用初始化失败:', error);
        showError('应用初始化失败: ' + error.message);
    }
}

// 设置导航
function setupNavigation() {
    const navLinks = document.querySelectorAll('[data-page]');
    navLinks.forEach(link => {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            const page = this.getAttribute('data-page');
            showPage(page);
        });
    });
}

// 显示页面
async function showPage(pageName) {
    // 隐藏所有页面
    document.querySelectorAll('.page-content').forEach(page => {
        page.style.display = 'none';
    });
    
    // 移除所有导航激活状态
    document.querySelectorAll('.nav-link').forEach(link => {
        link.classList.remove('active');
    });
    
    // 激活当前导航
    document.querySelector(`[data-page="${pageName}"]`).classList.add('active');
    
    // 显示目标页面
    const targetPage = document.getElementById(pageName + '-page');
    if (targetPage) {
        targetPage.style.display = 'block';
        targetPage.classList.add('fade-in');
    }
    
    // 加载页面数据
    switch (pageName) {
        case 'dashboard':
            await loadDashboard();
            break;
        case 'nodes':
            await loadNodes();
            break;
        case 'speed-test':
            await loadTestResults();
            break;
        case 'notifications':
            await loadNotifications();
            break;
        case 'settings':
            await loadSettings();
            break;
    }
    
    currentPage = pageName;
}

// 加载仪表板
async function loadDashboard() {
    try {
        showLoading();
        
        // 加载统计信息
        const statsResponse = await fetch(`${API_BASE}/stats`);
        const statsData = await statsResponse.json();
        
        if (statsData.success) {
            updateDashboardStats(statsData.data);
        }
        
        // 加载最近测速结果
        const resultsResponse = await fetch(`${API_BASE}/test/results?limit=5`);
        const resultsData = await resultsResponse.json();
        
        if (resultsData.success) {
            updateRecentResults(resultsData.data.results);
        }
        
        hideLoading();
    } catch (error) {
        console.error('加载仪表板失败:', error);
        hideLoading();
        showError('加载仪表板失败: ' + error.message);
    }
}

// 更新仪表板统计
function updateDashboardStats(stats) {
    document.getElementById('total-nodes').textContent = stats.nodes.total;
    document.getElementById('online-nodes').textContent = stats.nodes.online;
    document.getElementById('success-rate').textContent = stats.tests.successRate + '%';
    document.getElementById('today-tests').textContent = stats.tests.recent24h;
}

// 更新最近测速结果
function updateRecentResults(results) {
    const container = document.getElementById('recent-results');
    
    if (results.length === 0) {
        container.innerHTML = '<div class="text-center text-muted">暂无测速结果</div>';
        return;
    }
    
    const html = results.map(result => `
        <div class="result-item ${result.isSuccess ? 'result-success' : 'result-failure'}">
            <div class="result-header">
                <div class="result-node">${result.node ? result.node.name : '未知节点'}</div>
                <div class="result-time">${formatTime(result.testTime)}</div>
            </div>
            <div class="result-details">
                <div class="result-detail">
                    <i class="bi ${result.isSuccess ? 'bi-check-circle text-success' : 'bi-x-circle text-danger'}"></i>
                    状态: ${result.isSuccess ? '成功' : '失败'}
                </div>
                ${result.isSuccess ? `
                    <div class="result-detail">
                        <i class="bi bi-speedometer2"></i>
                        延迟: ${result.latency}ms
                    </div>
                ` : `
                    <div class="result-detail">
                        <i class="bi bi-exclamation-triangle"></i>
                        错误: ${result.error || '未知错误'}
                    </div>
                `}
            </div>
        </div>
    `).join('');
    
    container.innerHTML = html;
}

// 加载节点列表
async function loadNodes() {
    try {
        showLoading();
        
        const search = document.getElementById('node-search')?.value || '';
        const status = document.getElementById('status-filter')?.value || '';
        
        const params = new URLSearchParams({
            limit: 1000, // 设置一个很大的限制，获取所有节点
            ...(search && { search }),
            ...(status && { status })
        });
        
        const response = await fetch(`${API_BASE}/nodes?${params}`);
        const data = await response.json();
        
        if (data.success) {
            updateNodesList(data.data);
        }
        
        hideLoading();
    } catch (error) {
        console.error('加载节点列表失败:', error);
        hideLoading();
        showError('加载节点列表失败: ' + error.message);
    }
}

// 更新节点列表
function updateNodesList(data) {
    const container = document.getElementById('nodes-list');
    const { nodes, pagination } = data;
    
    if (nodes.length === 0) {
        container.innerHTML = '<div class="row"><div class="col-12"><div class="text-center text-muted">暂无节点</div></div></div>';
        return;
    }
    
    const html = '<div class="row">' + nodes.map((node, index) => `
        <div class="col-md-6 mb-3">
            <div class="node-item">
                <div class="node-header">
                    <div class="node-name">${node.name}</div>
                    <div class="node-status ${node.status}">${node.status === 'online' ? '在线' : '离线'}</div>
                </div>
                <div class="node-info">
                    <div class="node-info-item">
                        <i class="bi bi-hdd-network"></i>
                        类型: ${node.type}
                    </div>
                    <div class="node-info-item">
                        <i class="bi bi-geo-alt"></i>
                        服务器: ${node.server}
                    </div>
                    <div class="node-info-item">
                        <i class="bi bi-arrow-left-right"></i>
                        端口: ${node.port}
                    </div>

                    ${node.testResults && node.testResults.length > 0 ? `
                        <div class="node-info-item last-test">
                            <i class="bi bi-clock"></i>
                            最后测速: ${formatTime(node.testResults[0].testTime)}
                            ${node.testResults[0].isSuccess ? `
                                <span class="latency-separator">|</span>
                                <i class="bi bi-speedometer2"></i>
                                延迟: <span class="latency-value">${node.testResults[0].latency}ms</span>
                            ` : ''}
                        </div>
                    ` : ''}
                </div>
                <div class="mt-2">
                    <button class="btn btn-sm btn-outline-primary" onclick="viewNodeDetail(${node.id})">
                        <i class="bi bi-eye"></i> 详情
                    </button>
                    <button class="btn btn-sm btn-outline-success" onclick="testSingleNode(${node.id})">
                        <i class="bi bi-speedometer"></i> 测速
                    </button>
                </div>
            </div>
        </div>
    `).join('') + '</div>';
    
    container.innerHTML = html;
}

// 加载测速结果
async function loadTestResults() {
    try {
        showLoading();
        
        const nodeId = document.getElementById('result-node-filter')?.value || '';
        const isSuccess = document.getElementById('result-status-filter')?.value || '';
        const startDate = document.getElementById('start-date')?.value || '';
        const endDate = document.getElementById('end-date')?.value || '';
        
        const params = new URLSearchParams({
            limit: 1000, // 设置一个很大的限制，获取所有结果
            ...(nodeId && { nodeId }),
            ...(isSuccess && { isSuccess }),
            ...(startDate && { startDate }),
            ...(endDate && { endDate })
        });
        
        const response = await fetch(`${API_BASE}/test/results?${params}`);
        const data = await response.json();
        
        if (data.success) {
            updateTestResults(data.data);
        }
        
        hideLoading();
    } catch (error) {
        console.error('加载测速结果失败:', error);
        hideLoading();
        showError('加载测速结果失败: ' + error.message);
    }
}

// 更新测速结果
function updateTestResults(data) {
    const container = document.getElementById('test-results');
    const { results, pagination } = data;
    
    if (results.length === 0) {
        container.innerHTML = '<div class="row"><div class="col-12"><div class="text-center text-muted">暂无测速结果</div></div></div>';
        return;
    }
    
    const html = '<div class="row">' + results.map((result, index) => `
        <div class="col-md-6 mb-3">
            <div class="result-item ${result.isSuccess ? 'result-success' : 'result-failure'}">
                <div class="result-header">
                    <div class="result-node">${result.node ? result.node.name : '未知节点'}</div>
                    <div class="result-time">${formatTime(result.testTime)}</div>
                </div>
                <div class="result-details">
                    <div class="result-detail">
                        <i class="bi ${result.isSuccess ? 'bi-check-circle text-success' : 'bi-x-circle text-danger'}"></i>
                        状态: ${result.isSuccess ? '成功' : '失败'}
                    </div>
                    ${result.isSuccess ? `
                        <div class="result-detail">
                            <i class="bi bi-speedometer2"></i>
                            延迟: ${result.latency}ms
                        </div>
                    ` : `
                        <div class="result-detail">
                            <i class="bi bi-exclamation-triangle"></i>
                            错误: ${result.error || '未知错误'}
                        </div>
                    `}
                </div>
            </div>
        </div>
    `).join('') + '</div>';
    
    container.innerHTML = html;
}

// 加载通知记录
async function loadNotifications(page = 1) {
    try {
        showLoading();
        
        const params = new URLSearchParams({
            page: page,
            limit: 20
        });
        
        const response = await fetch(`${API_BASE}/notifications?${params}`);
        const data = await response.json();
        
        if (data.success) {
            updateNotificationsList(data.data);
            currentNotificationsPage = page;
        }
        
        hideLoading();
    } catch (error) {
        console.error('加载通知记录失败:', error);
        hideLoading();
        showError('加载通知记录失败: ' + error.message);
    }
}

// 更新通知列表
function updateNotificationsList(data) {
    const container = document.getElementById('notifications-list');
    const { notifications, pagination } = data;
    
    if (notifications.length === 0) {
        container.innerHTML = '<div class="text-center text-muted">暂无通知记录</div>';
        return;
    }
    
    const html = notifications.map(notification => `
        <div class="notification-item ${notification.isSent ? 'notification-sent' : 'notification-failed'}">
            <div class="result-header">
                <div class="result-node">${notification.type}</div>
                <div class="result-time">${formatTime(notification.createdAt)}</div>
            </div>
            <div class="result-details">
                <div class="result-detail">
                    <i class="bi ${notification.isSent ? 'bi-check-circle text-success' : 'bi-x-circle text-danger'}"></i>
                    状态: ${notification.isSent ? '已发送' : '发送失败'}
                </div>
                <div class="result-detail">
                    <i class="bi bi-chat"></i>
                    内容: ${notification.message.substring(0, 100)}${notification.message.length > 100 ? '...' : ''}
                </div>
                ${notification.node ? `
                    <div class="result-detail">
                        <i class="bi bi-hdd-network"></i>
                        节点: ${notification.node.name}
                    </div>
                ` : ''}
            </div>
        </div>
    `).join('');
    
    container.innerHTML = html;
    
    // 更新分页
    updatePagination('notifications-pagination', pagination, loadNotifications);
}

// 加载设置页面
async function loadSettings() {
    try {
        showLoading();
        
        // 加载系统状态
        const statusResponse = await fetch(`${API_BASE}/status`);
        const statusData = await statusResponse.json();
        
        if (statusData.success) {
            updateSystemStatus(statusData.data);
        }
        
        // 加载订阅状态
        const subscriptionResponse = await fetch(`${API_BASE}/subscription/status`);
        const subscriptionData = await subscriptionResponse.json();
        
        if (subscriptionData.success) {
            updateSubscriptionStatus(subscriptionData.data);
        }
        
        hideLoading();
    } catch (error) {
        console.error('加载设置失败:', error);
        hideLoading();
        showError('加载设置失败: ' + error.message);
    }
}

// 更新系统状态
function updateSystemStatus(status) {
    const container = document.getElementById('system-status');
    
    const html = `
        <div class="row">
            <div class="col-md-6">
                <h6>调度器状态</h6>
                <div class="mb-2">
                    <span class="badge ${status.isRunning ? 'bg-success' : 'bg-danger'}">
                        ${status.isRunning ? '运行中' : '已停止'}
                    </span>
                </div>
                <div class="mb-2">
                    <small class="text-muted">下次测速: ${status.nextTestTime ? formatTime(status.nextTestTime) : '未设置'}</small>
                </div>
                <div class="mb-2">
                    <small class="text-muted">测速间隔: ${status.testInterval ? Math.round(status.testInterval / 60000) + '分钟' : '未设置'}</small>
                </div>
            </div>
            <div class="col-md-6">
                <h6>系统信息</h6>
                <div class="mb-2">
                    <small class="text-muted">运行时间: ${formatUptime(status.uptime)}</small>
                </div>
                <div class="mb-2">
                    <small class="text-muted">总测速次数: ${status.totalTests || 0}</small>
                </div>
            </div>
        </div>
    `;
    
    container.innerHTML = html;
}

// 更新订阅状态
function updateSubscriptionStatus(status) {
    const container = document.getElementById('subscription-status');
    
    const html = `
        <div class="mb-2">
            <strong>订阅地址:</strong> ${status.subscriptionUrl || '未配置'}
        </div>
        <div class="mb-2">
            <strong>更新间隔:</strong> ${status.updateInterval ? Math.round(status.updateInterval / 60000) + '分钟' : '未设置'}
        </div>
        <div class="mb-2">
            <strong>自动更新:</strong> 
            <span class="badge ${status.autoUpdateEnabled ? 'bg-success' : 'bg-secondary'}">
                ${status.autoUpdateEnabled ? '已启用' : '已禁用'}
            </span>
        </div>
        ${status.lastUpdate ? `
            <div class="mb-2">
                <strong>最后更新:</strong> ${formatTime(status.lastUpdate)}
            </div>
        ` : ''}
    `;
    
    container.innerHTML = html;
}

// 开始测速
async function startSpeedTest() {
    try {
        showLoading();
        
        const response = await fetch(`${API_BASE}/test/manual`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({})
        });
        
        const data = await response.json();
        
        if (data.success) {
            showSuccess(`测速已开始，共测试 ${data.data.testedNodes} 个节点`);
            // 刷新当前页面数据
            if (currentPage === 'dashboard') {
                await loadDashboard();
            } else if (currentPage === 'speed-test') {
                await loadTestResults();
            }
        } else {
            showError('测速失败: ' + data.error);
        }
        
        hideLoading();
    } catch (error) {
        console.error('测速失败:', error);
        hideLoading();
        showError('测速失败: ' + error.message);
    }
}

// 测试通知
async function testNotification() {
    try {
        showLoading();
        
        const response = await fetch(`${API_BASE}/notifications/test`, {
            method: 'POST'
        });
        
        const data = await response.json();
        
        if (data.success) {
            showSuccess('通知测试成功');
        } else {
            showError('通知测试失败: ' + data.error);
        }
        
        hideLoading();
    } catch (error) {
        console.error('通知测试失败:', error);
        hideLoading();
        showError('通知测试失败: ' + error.message);
    }
}

// 刷新统计
async function refreshStats() {
    await loadDashboard();
    showSuccess('统计信息已刷新');
}

// 显示系统状态
async function showSystemStatus() {
    await showPage('settings');
}

// 搜索节点
function searchNodes() {
    loadNodes();
}

// 搜索结果
function searchResults() {
    loadTestResults();
}

// 导入节点
function importNodes() {
    const modal = new bootstrap.Modal(document.getElementById('importModal'));
    modal.show();
}

// 确认导入
async function confirmImport() {
    try {
        const configPath = document.getElementById('config-path').value;
        const configUrl = document.getElementById('config-url').value;
        
        if (!configPath && !configUrl) {
            showError('请提供配置文件路径或URL');
            return;
        }
        
        showLoading();
        
        const response = await fetch(`${API_BASE}/import/clash`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                configPath: configPath || undefined,
                configUrl: configUrl || undefined
            })
        });
        
        const data = await response.json();
        
        if (data.success) {
            showSuccess(`成功导入 ${data.data.imported} 个节点`);
            bootstrap.Modal.getInstance(document.getElementById('importModal')).hide();
            if (currentPage === 'nodes') {
                await loadNodes();
            }
        } else {
            showError('导入失败: ' + data.error);
        }
        
        hideLoading();
    } catch (error) {
        console.error('导入失败:', error);
        hideLoading();
        showError('导入失败: ' + error.message);
    }
}

// 更新订阅
async function updateSubscription() {
    try {
        showLoading();
        
        const response = await fetch(`${API_BASE}/subscription/update`, {
            method: 'POST'
        });
        
        const data = await response.json();
        
        if (data.success) {
            showSuccess('订阅更新成功');
            await loadSettings();
        } else {
            showError('订阅更新失败: ' + data.error);
        }
        
        hideLoading();
    } catch (error) {
        console.error('订阅更新失败:', error);
        hideLoading();
        showError('订阅更新失败: ' + error.message);
    }
}

// 查看节点详情
async function viewNodeDetail(nodeId) {
    try {
        const response = await fetch(`${API_BASE}/nodes/${nodeId}`);
        const data = await response.json();
        
        if (data.success) {
            const node = data.data;
            const modal = new bootstrap.Modal(document.getElementById('nodeDetailModal'));
            
            document.getElementById('node-detail-content').innerHTML = `
                <div class="row">
                    <div class="col-md-6">
                        <h6>基本信息</h6>
                        <table class="table table-sm">
                            <tr><td>名称:</td><td>${node.name}</td></tr>
                            <tr><td>类型:</td><td>${node.type}</td></tr>
                            <tr><td>服务器:</td><td>${node.server}</td></tr>
                            <tr><td>端口:</td><td>${node.port}</td></tr>

                            <tr><td>状态:</td><td><span class="badge ${node.status === 'online' ? 'bg-success' : 'bg-danger'}">${node.status === 'online' ? '在线' : '离线'}</span></td></tr>
                        </table>
                    </div>
                    <div class="col-md-6">
                        <h6>最近测速结果</h6>
                        ${node.testResults && node.testResults.length > 0 ? `
                            <div class="result-item ${node.testResults[0].isSuccess ? 'result-success' : 'result-failure'}">
                                <div class="result-header">
                                    <div class="result-time">${formatTime(node.testResults[0].testTime)}</div>
                                </div>
                                <div class="result-details">
                                    <div class="result-detail">
                                        <i class="bi ${node.testResults[0].isSuccess ? 'bi-check-circle text-success' : 'bi-x-circle text-danger'}"></i>
                                        状态: ${node.testResults[0].isSuccess ? '成功' : '失败'}
                                    </div>
                                    ${node.testResults[0].isSuccess ? `
                                        <div class="result-detail">
                                            <i class="bi bi-speedometer2"></i>
                                            延迟: ${node.testResults[0].latency}ms
                                        </div>
                                    ` : `
                                        <div class="result-detail">
                                            <i class="bi bi-exclamation-triangle"></i>
                                            错误: ${node.testResults[0].error || '未知错误'}
                                        </div>
                                    `}
                                </div>
                            </div>
                        ` : '<div class="text-muted">暂无测速结果</div>'}
                    </div>
                </div>
            `;
            
            modal.show();
        }
    } catch (error) {
        console.error('获取节点详情失败:', error);
        showError('获取节点详情失败: ' + error.message);
    }
}

// 测试单个节点
async function testSingleNode(nodeId) {
    try {
        showLoading();
        
        const response = await fetch(`${API_BASE}/test/manual`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ nodeIds: [nodeId] })
        });
        
        const data = await response.json();
        
        if (data.success) {
            showSuccess('节点测速已开始');
            // 刷新当前页面数据
            if (currentPage === 'nodes') {
                await loadNodes();
            } else if (currentPage === 'speed-test') {
                await loadTestResults();
            }
        } else {
            showError('节点测速失败: ' + data.error);
        }
        
        hideLoading();
    } catch (error) {
        console.error('节点测速失败:', error);
        hideLoading();
        showError('节点测速失败: ' + error.message);
    }
}

// 更新分页
function updatePagination(containerId, pagination, loadFunction) {
    const container = document.getElementById(containerId);
    
    if (pagination.pages <= 1) {
        container.innerHTML = '';
        return;
    }
    
    let html = '<ul class="pagination">';
    
    // 上一页
    if (pagination.page > 1) {
        html += `<li class="page-item"><a class="page-link" href="#" onclick="loadFunction(${pagination.page - 1})">上一页</a></li>`;
    }
    
    // 页码
    const startPage = Math.max(1, pagination.page - 2);
    const endPage = Math.min(pagination.pages, pagination.page + 2);
    
    for (let i = startPage; i <= endPage; i++) {
        html += `<li class="page-item ${i === pagination.page ? 'active' : ''}"><a class="page-link" href="#" onclick="loadFunction(${i})">${i}</a></li>`;
    }
    
    // 下一页
    if (pagination.page < pagination.pages) {
        html += `<li class="page-item"><a class="page-link" href="#" onclick="loadFunction(${pagination.page + 1})">下一页</a></li>`;
    }
    
    html += '</ul>';
    container.innerHTML = html;
}

// 工具函数
function formatTime(timeString) {
    const date = new Date(timeString);
    return date.toLocaleString('zh-CN');
}

function formatSpeed(speed) {
    if (!speed) return 'N/A';
    if (speed < 1024) return speed + ' B/s';
    if (speed < 1024 * 1024) return (speed / 1024).toFixed(1) + ' KB/s';
    if (speed < 1024 * 1024 * 1024) return (speed / (1024 * 1024)).toFixed(1) + ' MB/s';
    return (speed / (1024 * 1024 * 1024)).toFixed(1) + ' GB/s';
}

function formatUptime(seconds) {
    if (!seconds) return 'N/A';
    const hours = Math.floor(seconds / 3600);
    const minutes = Math.floor((seconds % 3600) / 60);
    return `${hours}小时${minutes}分钟`;
}

function showLoading() {
    document.getElementById('loading-overlay').style.display = 'flex';
}

function hideLoading() {
    document.getElementById('loading-overlay').style.display = 'none';
}

function showSuccess(message) {
    // 创建成功提示
    const toast = document.createElement('div');
    toast.className = 'alert alert-success alert-dismissible fade show position-fixed';
    toast.style.cssText = 'top: 20px; right: 20px; z-index: 9999; min-width: 300px;';
    toast.innerHTML = `
        ${message}
        <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
    `;
    document.body.appendChild(toast);
    
    // 3秒后自动移除
    setTimeout(() => {
        if (toast.parentNode) {
            toast.parentNode.removeChild(toast);
        }
    }, 3000);
}

function showError(message) {
    // 创建错误提示
    const toast = document.createElement('div');
    toast.className = 'alert alert-danger alert-dismissible fade show position-fixed';
    toast.style.cssText = 'top: 20px; right: 20px; z-index: 9999; min-width: 300px;';
    toast.innerHTML = `
        ${message}
        <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
    `;
    document.body.appendChild(toast);
    
    // 5秒后自动移除
    setTimeout(() => {
        if (toast.parentNode) {
            toast.parentNode.removeChild(toast);
        }
    }, 5000);
}