// logs.js - 查询日志页面功能

// 全局变量
let currentPage = 1;
let totalPages = 1;
let logsPerPage = 30; // 默认显示30条记录
let currentFilter = '';
let currentSearch = '';
let logsChart = null;

// 初始化查询日志页面
function initLogsPage() {
    console.log('初始化查询日志页面');
    
    // 加载日志统计数据
    loadLogsStats();
    
    // 加载日志详情
    loadLogs();
    
    // 初始化图表
    initLogsChart();
    
    // 绑定事件
    bindLogsEvents();
    
    // 建立WebSocket连接，用于实时更新统计数据和图表
    connectLogsWebSocket();
    
    // 在页面卸载时清理资源
    window.addEventListener('beforeunload', cleanupLogsResources);
}

// 清理资源
function cleanupLogsResources() {
    // 清除WebSocket连接
    if (wsConnection) {
        wsConnection.close();
        wsConnection = null;
    }
    
    // 清除重连计时器
    if (wsReconnectTimer) {
        clearTimeout(wsReconnectTimer);
        wsReconnectTimer = null;
    }
}

// 绑定事件
function bindLogsEvents() {
    // 搜索按钮
    const searchBtn = document.getElementById('logs-search-btn');
    if (searchBtn) {
        searchBtn.addEventListener('click', () => {
            currentSearch = document.getElementById('logs-search').value;
            currentPage = 1;
            loadLogs();
        });
    }
    
    // 搜索框回车事件
    const searchInput = document.getElementById('logs-search');
    if (searchInput) {
        searchInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') {
                currentSearch = searchInput.value;
                currentPage = 1;
                loadLogs();
            }
        });
    }
    
    // 结果过滤
    const resultFilter = document.getElementById('logs-result-filter');
    if (resultFilter) {
        resultFilter.addEventListener('change', () => {
            currentFilter = resultFilter.value;
            currentPage = 1;
            loadLogs();
        });
    }
    
    // 自定义记录数量
    const perPageSelect = document.getElementById('logs-per-page');
    if (perPageSelect) {
        perPageSelect.addEventListener('change', () => {
            logsPerPage = parseInt(perPageSelect.value);
            currentPage = 1;
            loadLogs();
        });
    }
    
    // 分页按钮
    const prevBtn = document.getElementById('logs-prev-page');
    const nextBtn = document.getElementById('logs-next-page');
    
    if (prevBtn) {
        prevBtn.addEventListener('click', () => {
            if (currentPage > 1) {
                currentPage--;
                loadLogs();
            }
        });
    }
    
    if (nextBtn) {
        nextBtn.addEventListener('click', () => {
            if (currentPage < totalPages) {
                currentPage++;
                loadLogs();
            }
        });
    }
    
    // 时间范围切换
    const timeRangeBtns = document.querySelectorAll('.time-range-btn');
    timeRangeBtns.forEach(btn => {
        btn.addEventListener('click', () => {
            // 更新按钮样式
            timeRangeBtns.forEach(b => {
                b.classList.remove('bg-primary', 'text-white');
                b.classList.add('bg-gray-200', 'text-gray-700');
            });
            btn.classList.remove('bg-gray-200', 'text-gray-700');
            btn.classList.add('bg-primary', 'text-white');
            
            // 更新图表
            const range = btn.getAttribute('data-range');
            updateLogsChart(range);
        });
    });
}

// 加载日志统计数据
function loadLogsStats() {
    fetch('/api/logs/stats')
        .then(response => response.json())
        .then(data => {
            // 更新统计卡片
            document.getElementById('logs-total-queries').textContent = data.totalQueries;
            document.getElementById('logs-avg-response-time').textContent = data.avgResponseTime.toFixed(2) + 'ms';
            document.getElementById('logs-active-ips').textContent = data.activeIPs;
            
            // 计算屏蔽率
            const blockRate = data.totalQueries > 0 ? (data.blockedQueries / data.totalQueries * 100).toFixed(1) : '0';
            document.getElementById('logs-block-rate').textContent = blockRate + '%';
        })
        .catch(error => {
            console.error('加载日志统计数据失败:', error);
        });
}

// 加载日志详情
function loadLogs() {
    // 显示加载状态
    const loadingEl = document.getElementById('logs-loading');
    if (loadingEl) {
        loadingEl.classList.remove('hidden');
    }
    
    // 构建请求URL
    let url = `/api/logs/query?limit=${logsPerPage}&offset=${(currentPage - 1) * logsPerPage}`;
    
    // 添加过滤条件
    if (currentFilter) {
        url += `&result=${currentFilter}`;
    }
    
    // 添加搜索条件
    if (currentSearch) {
        url += `&search=${encodeURIComponent(currentSearch)}`;
    }
    
    fetch(url)
        .then(response => response.json())
        .then(data => {
            // 加载日志总数
            return fetch('/api/logs/count').then(response => response.json()).then(countData => {
                return { logs: data, count: countData.count };
            });
        })
        .then(result => {
            const logs = result.logs;
            const totalLogs = result.count;
            
            // 计算总页数
            totalPages = Math.ceil(totalLogs / logsPerPage);
            
            // 更新日志表格
            updateLogsTable(logs);
            
            // 更新分页信息
            updateLogsPagination();
            
            // 隐藏加载状态
            if (loadingEl) {
                loadingEl.classList.add('hidden');
            }
        })
        .catch(error => {
            console.error('加载日志详情失败:', error);
            
            // 隐藏加载状态
            if (loadingEl) {
                loadingEl.classList.add('hidden');
            }
        });
}

// 更新日志表格
function updateLogsTable(logs) {
    const tableBody = document.getElementById('logs-table-body');
    if (!tableBody) return;
    
    // 清空表格
    tableBody.innerHTML = '';
    
    if (logs.length === 0) {
        // 显示空状态
        const emptyRow = document.createElement('tr');
        emptyRow.innerHTML = `
            <td colspan="7" class="py-8 text-center text-gray-500">
                <i class="fa fa-file-text-o text-4xl mb-2 text-gray-300"></i>
                <div>暂无查询日志</div>
            </td>
        `;
        tableBody.appendChild(emptyRow);
        return;
    }
    
    // 填充表格
    logs.forEach(log => {
        const row = document.createElement('tr');
        row.className = 'border-b border-gray-100 hover:bg-gray-50 transition-colors';
        
        // 格式化时间
        const time = new Date(log.Timestamp);
        const formattedTime = time.toLocaleString('zh-CN', {
            year: 'numeric',
            month: '2-digit',
            day: '2-digit',
            hour: '2-digit',
            minute: '2-digit',
            second: '2-digit'
        });
        
        // 结果样式
        let resultClass = '';
        let resultText = '';
        switch (log.Result) {
            case 'allowed':
                resultClass = 'text-success';
                resultText = '允许';
                break;
            case 'blocked':
                resultClass = 'text-danger';
                resultText = '屏蔽';
                break;
            case 'error':
                resultClass = 'text-warning';
                resultText = '错误';
                break;
        }
        
        // 构建行内容
        row.innerHTML = `
            <td class="py-3 px-4 text-sm">${formattedTime}</td>
            <td class="py-3 px-4 text-sm">${log.ClientIP}</td>
            <td class="py-3 px-4 text-sm font-medium">${log.Domain}</td>
            <td class="py-3 px-4 text-sm">${log.QueryType}</td>
            <td class="py-3 px-4 text-sm"><span class="${resultClass}">${resultText}</span></td>
            <td class="py-3 px-4 text-sm">${log.ResponseTime}ms</td>
            <td class="py-3 px-4 text-sm text-gray-500">${log.BlockRule || '-'}</td>
        `;
        
        tableBody.appendChild(row);
    });
}

// 更新分页信息
function updateLogsPagination() {
    // 更新页码显示
    document.getElementById('logs-current-page').textContent = currentPage;
    document.getElementById('logs-total-pages').textContent = totalPages;
    
    // 更新按钮状态
    const prevBtn = document.getElementById('logs-prev-page');
    const nextBtn = document.getElementById('logs-next-page');
    
    if (prevBtn) {
        prevBtn.disabled = currentPage === 1;
    }
    
    if (nextBtn) {
        nextBtn.disabled = currentPage === totalPages;
    }
}

// 初始化日志图表
function initLogsChart() {
    const ctx = document.getElementById('logs-trend-chart');
    if (!ctx) return;
    
    // 获取24小时统计数据
    fetch('/api/hourly-stats')
        .then(response => response.json())
        .then(data => {
            // 创建图表
            logsChart = new Chart(ctx, {
                type: 'line',
                data: {
                    labels: data.labels,
                    datasets: [{
                        label: '查询数',
                        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: true,
                            position: 'top'
                        },
                        tooltip: {
                            mode: 'index',
                            intersect: false
                        }
                    },
                    scales: {
                        y: {
                            beginAtZero: true,
                            ticks: {
                                precision: 0
                            }
                        }
                    }
                }
            });
        })
        .catch(error => {
            console.error('初始化日志图表失败:', error);
        });
}

// 更新日志图表
function updateLogsChart(range) {
    if (!logsChart) return;
    
    let url = '';
    switch (range) {
        case '24h':
            url = '/api/hourly-stats';
            break;
        case '7d':
            url = '/api/daily-stats';
            break;
        case '30d':
            url = '/api/monthly-stats';
            break;
        default:
            url = '/api/hourly-stats';
    }
    
    fetch(url)
        .then(response => response.json())
        .then(data => {
            // 更新图表数据
            logsChart.data.labels = data.labels;
            logsChart.data.datasets[0].data = data.data;
            logsChart.update();
        })
        .catch(error => {
            console.error('更新日志图表失败:', error);
        });
}

// 建立WebSocket连接
function connectLogsWebSocket() {
    try {
        // 构建WebSocket URL
        const wsProtocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
        const wsUrl = `${wsProtocol}//${window.location.host}/ws/stats`;
        
        console.log('正在连接WebSocket:', wsUrl);
        
        // 创建WebSocket连接
        wsConnection = new WebSocket(wsUrl);
        
        // 连接打开事件
        wsConnection.onopen = function() {
            console.log('WebSocket连接已建立');
        };
        
        // 接收消息事件
        wsConnection.onmessage = function(event) {
            try {
                const data = JSON.parse(event.data);
                
                if (data.type === 'initial_data' || data.type === 'stats_update') {
                    console.log('收到实时数据更新');
                    // 只更新统计数据，不更新日志详情
                    updateLogsStatsFromWebSocket(data.data);
                }
            } catch (error) {
                console.error('处理WebSocket消息失败:', error);
            }
        };
        
        // 连接关闭事件
        wsConnection.onclose = function(event) {
            console.warn('WebSocket连接已关闭，代码:', event.code);
            wsConnection = null;
            
            // 设置重连
            setupLogsReconnect();
        };
        
        // 连接错误事件
        wsConnection.onerror = function(error) {
            console.error('WebSocket连接错误:', error);
        };
        
    } catch (error) {
        console.error('创建WebSocket连接失败:', error);
    }
}

// 设置重连逻辑
function setupLogsReconnect() {
    if (wsReconnectTimer) {
        return; // 已经有重连计时器在运行
    }
    
    const reconnectDelay = 5000; // 5秒后重连
    console.log(`将在${reconnectDelay}ms后尝试重新连接WebSocket`);
    
    wsReconnectTimer = setTimeout(() => {
        connectLogsWebSocket();
    }, reconnectDelay);
}

// 从WebSocket更新日志统计数据
function updateLogsStatsFromWebSocket(stats) {
    try {
        // 更新统计卡片
        if (stats.dns) {
            // 适配不同的数据结构
            const totalQueries = stats.dns.Queries || 0;
            const blockedQueries = stats.dns.Blocked || 0;
            const allowedQueries = stats.dns.Allowed || 0;
            const errorQueries = stats.dns.Errors || 0;
            const avgResponseTime = stats.dns.AvgResponseTime || 0;
            const activeIPs = stats.activeIPs || Object.keys(stats.dns.SourceIPs || {}).length;
            
            // 更新统计卡片
            document.getElementById('logs-total-queries').textContent = totalQueries;
            document.getElementById('logs-avg-response-time').textContent = avgResponseTime.toFixed(2) + 'ms';
            document.getElementById('logs-active-ips').textContent = activeIPs;
            
            // 计算屏蔽率
            const blockRate = totalQueries > 0 ? (blockedQueries / totalQueries * 100).toFixed(1) : '0';
            document.getElementById('logs-block-rate').textContent = blockRate + '%';
        }
    } catch (error) {
        console.error('从WebSocket更新日志统计数据失败:', error);
    }
}

// 定期更新日志统计数据（备用方案）
setInterval(() => {
    // 只有在查询日志页面时才更新
    if (window.location.hash === '#logs') {
        loadLogsStats();
        // 不自动更新日志详情，只更新统计数据
    }
}, 30000); // 每30秒更新一次