// 数据统计面板脚本
document.addEventListener('DOMContentLoaded', () => {
    // DOM元素
    const totalUsersEl = document.getElementById('total-users');
    const onlineUsersEl = document.getElementById('online-users');
    const todayUsersEl = document.getElementById('today-users');
    const playingUsersEl = document.getElementById('playing-users');
    const onlineUsersTable = document.getElementById('online-users-table').querySelector('tbody');
    const todayUsersTable = document.getElementById('today-users-table').querySelector('tbody');
    const refreshBtn = document.getElementById('refresh-data-btn');
    
    // 状态变量
    let refreshInterval = null;
    
    // 初始化
    loadStats();
    
    // 设置自动刷新 (每60秒)
    refreshInterval = setInterval(loadStats, 60000);
    
    // 刷新按钮事件
    refreshBtn.addEventListener('click', loadStats);
    
    // 加载统计数据
    function loadStats() {
        // 显示加载状态
        totalUsersEl.textContent = '--';
        onlineUsersEl.textContent = '--';
        todayUsersEl.textContent = '--';
        playingUsersEl.textContent = '--';
        
        onlineUsersTable.innerHTML = '<tr class="loading-row"><td colspan="4">加载中...</td></tr>';
        todayUsersTable.innerHTML = '<tr class="loading-row"><td colspan="2">加载中...</td></tr>';
        
        // 加载数据
        fetch('/api/admin/stats')
            .then(response => response.json())
            .then(data => {
                // 更新统计数字
                totalUsersEl.textContent = data.total_users || 0;
                onlineUsersEl.textContent = data.online_users_count || 0;
                todayUsersEl.textContent = data.today_users_count || 0;
                
                // 计算游戏中的用户数
                const playingUsers = (data.online_users || []).filter(user => user.status === 'playing').length;
                playingUsersEl.textContent = playingUsers;
                
                // 更新在线用户表格
                renderOnlineUsersTable(data.online_users || []);
                
                // 更新今日新注册用户表格
                renderTodayUsersTable(data.today_users || []);
            })
            .catch(error => {
                console.error('加载统计数据失败:', error);
                showError('获取数据失败，请稍后重试');
            });
    }
    
    // 渲染在线用户表格
    function renderOnlineUsersTable(users) {
        if (users.length === 0) {
            onlineUsersTable.innerHTML = '<tr><td colspan="4" class="empty-data">目前没有在线用户</td></tr>';
            return;
        }
        
        onlineUsersTable.innerHTML = '';
        
        users.forEach(user => {
            const row = document.createElement('tr');
            
            // 格式化最后活动时间
            let lastActivity = '未知';
            if (user.last_activity) {
                try {
                    const activityDate = new Date(user.last_activity);
                    lastActivity = formatDateTime(activityDate);
                } catch (e) {
                    lastActivity = user.last_activity;
                }
            }
            
            // 根据状态设置样式
            let statusClass = '';
            let statusText = user.status || '未知';
            
            if (statusText === 'playing') {
                statusClass = 'status-playing';
                statusText = '游戏中';
            } else if (statusText === 'idle') {
                statusClass = 'status-idle';
                statusText = '空闲';
            }
            
            row.innerHTML = `
                <td>${user.username}</td>
                <td><span class="status-badge ${statusClass}">${statusText}</span></td>
                <td>${user.ip_address || '未知'}</td>
                <td>${lastActivity}</td>
            `;
            
            onlineUsersTable.appendChild(row);
        });
    }
    
    // 渲染今日新注册用户表格
    function renderTodayUsersTable(users) {
        if (users.length === 0) {
            todayUsersTable.innerHTML = '<tr><td colspan="2" class="empty-data">今日暂无新注册用户</td></tr>';
            return;
        }
        
        todayUsersTable.innerHTML = '';
        
        // 按注册时间排序，最近的在前
        users.sort((a, b) => {
            return new Date(b.created_at) - new Date(a.created_at);
        });
        
        users.forEach(user => {
            const row = document.createElement('tr');
            
            // 格式化注册时间
            let createdAt = '未知';
            if (user.created_at) {
                try {
                    const createdDate = new Date(user.created_at);
                    createdAt = formatDateTime(createdDate);
                } catch (e) {
                    createdAt = user.created_at;
                }
            }
            
            row.innerHTML = `
                <td>${user.username}</td>
                <td>${createdAt}</td>
            `;
            
            todayUsersTable.appendChild(row);
        });
    }
    
    // 显示错误消息
    function showError(message) {
        // 在表格中显示错误
        onlineUsersTable.innerHTML = `<tr><td colspan="4" class="error-data">${message}</td></tr>`;
        todayUsersTable.innerHTML = `<tr><td colspan="2" class="error-data">${message}</td></tr>`;
        
        // 在统计卡片中显示错误
        totalUsersEl.textContent = 'ERR';
        onlineUsersEl.textContent = 'ERR';
        todayUsersEl.textContent = 'ERR';
        playingUsersEl.textContent = 'ERR';
    }
    
    // 格式化日期时间
    function formatDateTime(date) {
        const hours = String(date.getHours()).padStart(2, '0');
        const minutes = String(date.getMinutes()).padStart(2, '0');
        const seconds = String(date.getSeconds()).padStart(2, '0');
        const year = date.getFullYear();
        const month = String(date.getMonth() + 1).padStart(2, '0');
        const day = String(date.getDate()).padStart(2, '0');
        
        return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
    }
    
    // 页面卸载时清除刷新间隔
    window.addEventListener('beforeunload', () => {
        if (refreshInterval) {
            clearInterval(refreshInterval);
        }
    });
});

// 添加CSS样式
document.head.insertAdjacentHTML('beforeend', `
<style>
.status-badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.9rem;
    text-align: center;
}

.status-playing {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.status-idle {
    background-color: #fff8e1;
    color: #ff8f00;
}

.empty-data {
    text-align: center;
    padding: 20px;
    color: #666;
    font-style: italic;
}

.error-data {
    text-align: center;
    padding: 20px;
    color: #d32f2f;
    font-weight: 500;
}
</style>
`);