// dashboard.js - 仪表盘功能实现

// 全局变量
let ratioChart = null;
let dnsRequestsChart = null;
let intervalId = null;

// 初始化仪表盘
async function initDashboard() {
    try {
        // 加载初始数据
        await loadDashboardData();
        
        // 初始化图表
        initCharts();
        
        // 初始化时间范围切换
        initTimeRangeToggle();
        
        // 设置定时更新
        intervalId = setInterval(loadDashboardData, 5000); // 每5秒更新一次
    } catch (error) {
        console.error('初始化仪表盘失败:', error);
        showNotification('初始化失败: ' + error.message, 'error');
    }
}

// 加载仪表盘数据
async function loadDashboardData() {
    console.log('开始加载仪表盘数据');
    try {
        // 获取基本统计数据
        const stats = await api.getStats();
        console.log('统计数据:', stats);
        
        // 获取TOP被屏蔽域名
        const topBlockedDomains = await api.getTopBlockedDomains();
        console.log('TOP被屏蔽域名:', topBlockedDomains);
        
        // 获取最近屏蔽域名
        const recentBlockedDomains = await api.getRecentBlockedDomains();
        console.log('最近屏蔽域名:', recentBlockedDomains);
        
        // 原并行请求方式（保留以备后续恢复）
        // const [stats, topBlockedDomains, recentBlockedDomains] = await Promise.all([
        //     api.getStats(),
        //     api.getTopBlockedDomains(),
        //     api.getRecentBlockedDomains()
        // ]);
        
        // 更新统计卡片
        updateStatsCards(stats);
        
        // 尝试从stats中获取总查询数等信息
        if (stats.dns) {
            totalQueries = stats.dns.Allowed + stats.dns.Blocked + (stats.dns.Errors || 0);
            blockedQueries = stats.dns.Blocked;
            errorQueries = stats.dns.Errors || 0;
            allowedQueries = stats.dns.Allowed;
        } else {
            totalQueries = stats.totalQueries || 0;
            blockedQueries = stats.blockedQueries || 0;
            errorQueries = stats.errorQueries || 0;
            allowedQueries = stats.allowedQueries || 0;
        }
        
        // 更新新卡片数据 - 使用API返回的真实数据
        if (document.getElementById('avg-response-time')) {
            // 保留两位小数并添加单位
            const responseTime = stats.avgResponseTime ? stats.avgResponseTime.toFixed(2) + 'ms' : '---';
            const responsePercent = stats.responseTimePercent !== undefined ? stats.responseTimePercent + '%' : '---';
            document.getElementById('avg-response-time').textContent = responseTime;
            document.getElementById('response-time-percent').textContent = responsePercent;
        }
        
        if (document.getElementById('top-query-type')) {
            // 直接使用API返回的查询类型
            const queryType = stats.topQueryType || '---';
            const queryPercent = stats.queryTypePercentage !== undefined ? stats.queryTypePercentage + '%' : '---';
            document.getElementById('top-query-type').textContent = queryType;
            document.getElementById('query-type-percentage').textContent = queryPercent;
        }
        
        if (document.getElementById('active-ips')) {
            // 直接使用API返回的活跃IP数
            const activeIPs = stats.activeIPs !== undefined ? formatNumber(stats.activeIPs) : '---';
            const ipsPercent = stats.activeIPsPercent !== undefined ? stats.activeIPsPercent + '%' : '---';
            document.getElementById('active-ips').textContent = activeIPs;
            document.getElementById('active-ips-percent').textContent = ipsPercent;
        }
        
        if (document.getElementById('cpu-usage')) {
            // 保留两位小数并添加单位
            const cpuUsage = stats.cpuUsage ? stats.cpuUsage.toFixed(2) + '%' : '---';
            document.getElementById('cpu-usage').textContent = cpuUsage;
            
            // 设置CPU状态颜色
            const cpuStatusElem = document.getElementById('cpu-status');
            if (cpuStatusElem) {
                if (stats.cpuUsage !== undefined && stats.cpuUsage !== null) {
                    if (stats.cpuUsage > 80) {
                        cpuStatusElem.textContent = '警告';
                        cpuStatusElem.className = 'text-danger text-sm flex items-center';
                    } else if (stats.cpuUsage > 60) {
                        cpuStatusElem.textContent = '较高';
                        cpuStatusElem.className = 'text-warning text-sm flex items-center';
                    } else {
                        cpuStatusElem.textContent = '正常';
                        cpuStatusElem.className = 'text-success text-sm flex items-center';
                    }
                } else {
                    // 无数据时显示---
                    cpuStatusElem.textContent = '---';
                    cpuStatusElem.className = 'text-gray-400 text-sm flex items-center';
                }
            }
        }
        
        // 更新表格
        updateTopBlockedTable(topBlockedDomains);
        updateRecentBlockedTable(recentBlockedDomains);
        
        // 更新图表
        updateCharts({totalQueries, blockedQueries, allowedQueries, errorQueries});
        
        // 更新运行状态
        updateUptime();
    } catch (error) {
        console.error('加载仪表盘数据失败:', error);
        // 静默失败，不显示通知以免打扰用户
    }
}

// 更新统计卡片
function updateStatsCards(stats) {
    console.log('更新统计卡片，收到数据:', stats);
    
    // 适配不同的数据结构
    let totalQueries = 0, blockedQueries = 0, allowedQueries = 0, errorQueries = 0;
    
    // 检查数据结构，兼容可能的不同格式
    if (stats.dns) {
        // 可能的数据结构1: stats.dns.Queries等
        totalQueries = stats.dns.Queries || 0;
        blockedQueries = stats.dns.Blocked || 0;
        allowedQueries = stats.dns.Allowed || 0;
        errorQueries = stats.dns.Errors || 0;
    } else if (stats.totalQueries !== undefined) {
        // 可能的数据结构2: stats.totalQueries等
        totalQueries = stats.totalQueries || 0;
        blockedQueries = stats.blockedQueries || 0;
        allowedQueries = stats.allowedQueries || 0;
        errorQueries = stats.errorQueries || 0;
    } else if (Array.isArray(stats) && stats.length > 0) {
        // 可能的数据结构3: 数组形式
        totalQueries = stats[0].total || 0;
        blockedQueries = stats[0].blocked || 0;
        allowedQueries = stats[0].allowed || 0;
        errorQueries = stats[0].error || 0;
    }
    
    // 更新数量显示
    document.getElementById('total-queries').textContent = formatNumber(totalQueries);
    document.getElementById('blocked-queries').textContent = formatNumber(blockedQueries);
    document.getElementById('allowed-queries').textContent = formatNumber(allowedQueries);
    document.getElementById('error-queries').textContent = formatNumber(errorQueries);
    
    // 计算并更新百分比
    if (totalQueries > 0) {
        document.getElementById('blocked-percent').textContent = `${Math.round((blockedQueries / totalQueries) * 100)}%`;
        document.getElementById('allowed-percent').textContent = `${Math.round((allowedQueries / totalQueries) * 100)}%`;
        document.getElementById('error-percent').textContent = `${Math.round((errorQueries / totalQueries) * 100)}%`;
        document.getElementById('queries-percent').textContent = `100%`;
    } else {
        document.getElementById('queries-percent').textContent = '---';
        document.getElementById('blocked-percent').textContent = '---';
        document.getElementById('allowed-percent').textContent = '---';
        document.getElementById('error-percent').textContent = '---';
    }
}

// 更新Top屏蔽域名表格
function updateTopBlockedTable(domains) {
    console.log('更新Top屏蔽域名表格，收到数据:', domains);
    const tableBody = document.getElementById('top-blocked-table');
    
    let tableData = [];
    
    // 适配不同的数据结构
    if (Array.isArray(domains)) {
        tableData = domains.map(item => ({
            name: item.name || item.domain || item[0] || '未知',
            count: item.count || item[1] || 0
        }));
    } else if (domains && typeof domains === 'object') {
        // 如果是对象，转换为数组
        tableData = Object.entries(domains).map(([domain, count]) => ({
            name: domain,
            count: count || 0
        }));
    }
    
    // 如果没有有效数据，提供示例数据
    if (tableData.length === 0) {
        tableData = [
            { name: '---', count: '---' },
            { name: '---', count: '---' },
            { name: '---', count: '---' },
            { name: '---', count: '---' },
            { name: '---', count: '---' }
        ];
        console.log('使用示例数据填充Top屏蔽域名表格');
    }
    
    let html = '';
    for (const domain of tableData) {
        html += `
            <tr class="border-b border-gray-200 hover:bg-gray-50">
                <td class="py-3 px-4 text-sm">${domain.name}</td>
                <td class="py-3 px-4 text-sm text-right">${formatNumber(domain.count)}</td>
            </tr>
        `;
    }
    
    tableBody.innerHTML = html;
}

// 更新最近屏蔽域名表格
function updateRecentBlockedTable(domains) {
    console.log('更新最近屏蔽域名表格，收到数据:', domains);
    const tableBody = document.getElementById('recent-blocked-table');
    
    let tableData = [];
    
    // 适配不同的数据结构
    if (Array.isArray(domains)) {
        tableData = domains.map(item => ({
            name: item.name || item.domain || item[0] || '未知',
            timestamp: item.timestamp || item.time || Date.now()
        }));
    }
    
    // 如果没有有效数据，提供示例数据
    if (tableData.length === 0) {
        const now = Date.now();
        tableData = [
            { name: '---', timestamp: now - 5 * 60 * 1000 },
            { name: '---', timestamp: now - 15 * 60 * 1000 },
            { name: '---', timestamp: now - 30 * 60 * 1000 },
            { name: '---', timestamp: now - 45 * 60 * 1000 },
            { name: '---', timestamp: now - 60 * 60 * 1000 }
        ];
        console.log('使用示例数据填充最近屏蔽域名表格');
    }
    
    let html = '';
    for (const domain of tableData) {
        const time = formatTime(domain.timestamp);
        html += `
            <tr class="border-b border-gray-200 hover:bg-gray-50">
                <td class="py-3 px-4 text-sm">${domain.name}</td>
                <td class="py-3 px-4 text-sm text-right text-gray-500">${time}</td>
            </tr>
        `;
    }
    
    tableBody.innerHTML = html;
}

// 当前选中的时间范围
let currentTimeRange = '24h'; // 默认为24小时

// 初始化时间范围切换
function initTimeRangeToggle() {
    const timeRangeButtons = document.querySelectorAll('.time-range-btn');
    timeRangeButtons.forEach(button => {
        button.addEventListener('click', () => {
            // 移除所有按钮的激活状态
            timeRangeButtons.forEach(btn => btn.classList.remove('active'));
            // 添加当前按钮的激活状态
            button.classList.add('active');
            // 更新当前时间范围
            currentTimeRange = button.dataset.range;
            // 重新加载数据
            loadDashboardData();
            // 更新DNS请求图表
            drawDNSRequestsChart();
        });
    });
}

// 初始化图表
function initCharts() {
    // 初始化比例图表
    const ratioChartElement = document.getElementById('ratio-chart');
    if (!ratioChartElement) {
        console.error('未找到比例图表元素');
        return;
    }
    const ratioCtx = ratioChartElement.getContext('2d');
    ratioChart = new Chart(ratioCtx, {
        type: 'doughnut',
        data: {
            labels: ['正常解析', '被屏蔽', '错误'],
            datasets: [{
                data: ['---', '---', '---'],
                backgroundColor: ['#00B42A', '#F53F3F', '#FF7D00'],
                borderWidth: 0
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: {
                    position: 'bottom',
                }
            },
            cutout: '70%'
        }
    });
    
    // 初始化DNS请求统计图表
    drawDNSRequestsChart();
}

// 绘制DNS请求统计图表
function drawDNSRequestsChart() {
    const ctx = document.getElementById('dns-requests-chart');
    if (!ctx) {
        console.error('未找到DNS请求图表元素');
        return;
    }
    
    const chartContext = ctx.getContext('2d');
    let apiFunction;
    
    // 根据当前时间范围选择API函数
    switch (currentTimeRange) {
        case '7d':
            apiFunction = api.getDailyStats;
            break;
        case '30d':
            apiFunction = api.getMonthlyStats;
            break;
        default: // 24h
            apiFunction = api.getHourlyStats;
    }
    
    // 获取统计数据
    apiFunction().then(data => {
        // 创建或更新图表
        if (dnsRequestsChart) {
            dnsRequestsChart.data.labels = data.labels;
            dnsRequestsChart.data.datasets[0].data = data.data;
            dnsRequestsChart.update();
        } else {
            dnsRequestsChart = new Chart(chartContext, {
                type: 'line',
                data: {
                    labels: data.labels,
                    datasets: [{
                        label: 'DNS请求数量',
                        data: data.data,
                        borderColor: '#3b82f6',
                        backgroundColor: 'rgba(59, 130, 246, 0.1)',
                        tension: 0.4,
                        fill: true
                    }]
                },
                options: {
                    responsive: true,
                    maintainAspectRatio: false,
                    plugins: {
                        legend: {
                            display: false
                        },
                        tooltip: {
                            mode: 'index',
                            intersect: false
                        }
                    },
                    scales: {
                        y: {
                            beginAtZero: true,
                            grid: {
                                color: 'rgba(0, 0, 0, 0.1)'
                            }
                        },
                        x: {
                            grid: {
                                display: false
                            }
                        }
                    }
                }
            });
        }
    }).catch(error => {
        console.error('绘制DNS请求图表失败:', error);
    });
}

// 更新图表数据
function updateCharts(stats) {
    console.log('更新图表，收到统计数据:', stats);
    
    // 空值检查
    if (!stats) {
        console.error('更新图表失败: 未提供统计数据');
        return;
    }
    
    // 更新比例图表
    if (ratioChart) {
        let allowed = '---', blocked = '---', error = '---';
        
        // 尝试从stats数据中提取
        if (stats.dns) {
            allowed = stats.dns.Allowed || allowed;
            blocked = stats.dns.Blocked || blocked;
            error = stats.dns.Errors || error;
        } else if (stats.totalQueries !== undefined) {
            allowed = stats.allowedQueries || allowed;
            blocked = stats.blockedQueries || blocked;
            error = stats.errorQueries || error;
        }
        
        ratioChart.data.datasets[0].data = [allowed, blocked, error];
        ratioChart.update();
    }
}

// 更新运行状态
function updateUptime() {
    // 这里应该从API获取真实的运行时间
    const uptimeElement = document.getElementById('uptime');
    uptimeElement.textContent = '正常运行中';
    uptimeElement.className = 'mt-1 text-success';
}

// 格式化数字（添加千位分隔符）
function formatNumber(num) {
    return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

// 格式化时间
function formatTime(timestamp) {
    const date = new Date(timestamp);
    const now = new Date();
    const diff = now - date;
    
    // 如果是今天，显示时间
    if (date.toDateString() === now.toDateString()) {
        return date.toLocaleTimeString('zh-CN', {hour: '2-digit', minute: '2-digit'});
    }
    
    // 否则显示日期和时间
    return date.toLocaleString('zh-CN', {
        month: '2-digit',
        day: '2-digit',
        hour: '2-digit',
        minute: '2-digit'
    });
}

// 显示通知
function showNotification(message, type = 'info') {
    // 移除已存在的通知
    const existingNotification = document.getElementById('notification');
    if (existingNotification) {
        existingNotification.remove();
    }
    
    // 创建通知元素
    const notification = document.createElement('div');
    notification.id = 'notification';
    notification.className = `fixed top-4 right-4 px-6 py-3 rounded-lg shadow-lg z-50 transform transition-all duration-300 translate-y-0 opacity-0`;
    
    // 设置样式和内容
    let bgColor, textColor, icon;
    switch (type) {
        case 'success':
            bgColor = 'bg-success';
            textColor = 'text-white';
            icon = 'fa-check-circle';
            break;
        case 'error':
            bgColor = 'bg-danger';
            textColor = 'text-white';
            icon = 'fa-exclamation-circle';
            break;
        case 'warning':
            bgColor = 'bg-warning';
            textColor = 'text-white';
            icon = 'fa-exclamation-triangle';
            break;
        default:
            bgColor = 'bg-primary';
            textColor = 'text-white';
            icon = 'fa-info-circle';
    }
    
    notification.className += ` ${bgColor} ${textColor}`;
    notification.innerHTML = `
        <div class="flex items-center">
            <i class="fa ${icon} mr-3"></i>
            <span>${message}</span>
        </div>
    `;
    
    // 添加到页面
    document.body.appendChild(notification);
    
    // 显示通知
    setTimeout(() => {
        notification.classList.remove('translate-y-0', 'opacity-0');
        notification.classList.add('-translate-y-2', 'opacity-100');
    }, 10);
    
    // 自动关闭
    setTimeout(() => {
        notification.classList.add('translate-y-0', 'opacity-0');
        setTimeout(() => {
            notification.remove();
        }, 300);
    }, 3000);
}

// 页面切换处理
function handlePageSwitch() {
    const menuItems = document.querySelectorAll('nav a');
    
    menuItems.forEach(item => {
        item.addEventListener('click', (e) => {
            e.preventDefault();
            const targetId = item.getAttribute('href').substring(1);
            
            // 隐藏所有内容
            document.querySelectorAll('[id$="-content"]').forEach(content => {
                content.classList.add('hidden');
            });
            
            // 显示目标内容
            document.getElementById(`${targetId}-content`).classList.remove('hidden');
            
            // 更新页面标题
            document.getElementById('page-title').textContent = item.querySelector('span').textContent;
            
            // 更新活动菜单项
            menuItems.forEach(menuItem => {
                menuItem.classList.remove('sidebar-item-active');
            });
            item.classList.add('sidebar-item-active');
            
            // 侧边栏切换（移动端）
            if (window.innerWidth < 1024) {
                toggleSidebar();
            }
        });
    });
}

// 侧边栏切换
function toggleSidebar() {
    const sidebar = document.getElementById('sidebar');
    sidebar.classList.toggle('-translate-x-full');
}

// 响应式处理
function handleResponsive() {
    const toggleBtn = document.getElementById('toggle-sidebar');
    
    toggleBtn.addEventListener('click', toggleSidebar);
    
    // 初始状态处理
    if (window.innerWidth < 1024) {
        document.getElementById('sidebar').classList.add('-translate-x-full');
    }
    
    // 窗口大小改变时处理
    window.addEventListener('resize', () => {
        const sidebar = document.getElementById('sidebar');
        if (window.innerWidth >= 1024) {
            sidebar.classList.remove('-translate-x-full');
        }
    });
}

// 页面加载完成后初始化
window.addEventListener('DOMContentLoaded', () => {
    // 初始化页面切换
    handlePageSwitch();
    
    // 初始化响应式
    handleResponsive();
    
    // 初始化仪表盘
    initDashboard();
    
    // 页面卸载时清理定时器
    window.addEventListener('beforeunload', () => {
        if (intervalId) {
            clearInterval(intervalId);
        }
    });
});