// 初始化Hosts面板
function initHostsPanel() {
    // 加载Hosts列表
    loadHosts();
    
    // 初始化事件监听器
    initHostsEventListeners();
}

// 初始化事件监听器
function initHostsEventListeners() {
    // 添加Hosts按钮
    document.getElementById('add-hosts').addEventListener('click', addHostsEntry);
    
    // Hosts过滤
    document.getElementById('hosts-filter').addEventListener('input', filterHosts);
    
    // 按Enter键添加Hosts
    document.getElementById('hosts-domain').addEventListener('keypress', function(e) {
        if (e.key === 'Enter') {
            addHostsEntry();
        }
    });
}

// 加载Hosts列表
function loadHosts() {
    const tbody = document.getElementById('hosts-table').querySelector('tbody');
    showLoading(tbody);
    
    apiRequest('/shield/hosts', 'GET')
        .then(data => {
            renderHosts(data);
        })
        .catch(error => {
            console.error('获取Hosts列表失败:', error);
            showError(tbody, '获取Hosts列表失败');
            window.showNotification('获取Hosts列表失败', 'error');
        });
}

// 渲染Hosts表格
function renderHosts(hosts) {
    const tbody = document.getElementById('hosts-table').querySelector('tbody');
    if (!tbody) return;
    
    if (!hosts || hosts.length === 0) {
        showEmpty(tbody, '暂无Hosts条目');
        return;
    }
    
    tbody.innerHTML = '';
    
    hosts.forEach(entry => {
        addHostsToTable(entry.ip, entry.domain);
    });
    
    // 初始化表格排序
    initTableSort('hosts-table');
    
    // 初始化删除按钮监听器
    initDeleteHostsListeners();
}

// 添加Hosts到表格
function addHostsToTable(ip, domain) {
    const tbody = document.getElementById('hosts-table').querySelector('tbody');
    const row = document.createElement('tr');
    
    row.innerHTML = `
        <td>${ip}</td>
        <td>${domain}</td>
        <td class="actions-cell">
            <button class="btn btn-danger btn-sm delete-hosts" data-ip="${ip}" data-domain="${domain}">
                <i class="fas fa-trash-alt"></i> 删除
            </button>
        </td>
    `;
    
    tbody.appendChild(row);
}

// 添加Hosts条目
function addHostsEntry() {
    const ipInput = document.getElementById('hosts-ip');
    const domainInput = document.getElementById('hosts-domain');
    
    const ip = ipInput.value.trim();
    const domain = domainInput.value.trim();
    
    if (!ip) {
        window.showNotification('请输入IP地址', 'warning');
        ipInput.focus();
        return;
    }
    
    if (!domain) {
        window.showNotification('请输入域名', 'warning');
        domainInput.focus();
        return;
    }
    
    // 简单的IP地址格式验证
    if (!isValidIp(ip)) {
        window.showNotification('请输入有效的IP地址', 'warning');
        ipInput.focus();
        return;
    }
    
    apiRequest('/shield/hosts', 'POST', { ip: ip, domain: domain });
    apiRequest('/shield/hosts', 'POST', { ip: ip, domain: domain })
        .then(data => {
            if (data.success) {
                window.showNotification('Hosts条目添加成功', 'success');
                ipInput.value = '';
                domainInput.value = '';
                loadHosts();
            } else {
                window.showNotification(`添加失败: ${data.message || '未知错误'}`, 'error');
            }
        })
        .catch(error => {
            console.error('添加Hosts条目失败:', error);
            window.showNotification('添加Hosts条目失败', 'error');
        });
}

// 删除Hosts条目
function deleteHostsEntry(ip, domain) {
    apiRequest('/shield/hosts', 'DELETE', { ip: ip, domain: domain })
        .then(data => {
            if (data.success) {
                window.showNotification('Hosts条目删除成功', 'success');
                loadHosts();
            } else {
                window.showNotification(`删除失败: ${data.message || '未知错误'}`, 'error');
            }
        })
        .catch(error => {
            console.error('删除Hosts条目失败:', error);
            window.showNotification('删除Hosts条目失败', 'error');
        });
}

// 过滤Hosts
function filterHosts() {
    const filterText = document.getElementById('hosts-filter').value.toLowerCase();
    const rows = document.querySelectorAll('#hosts-table tbody tr');
    
    rows.forEach(row => {
        const ip = row.cells[0].textContent.toLowerCase();
        const domain = row.cells[1].textContent.toLowerCase();
        
        row.style.display = (ip.includes(filterText) || domain.includes(filterText)) ? '' : 'none';
    });
}

// 为删除按钮添加事件监听器
function initDeleteHostsListeners() {
    document.querySelectorAll('.delete-hosts').forEach(button => {
        button.addEventListener('click', function() {
            const ip = this.getAttribute('data-ip');
            const domain = this.getAttribute('data-domain');
            
            confirmAction(
                `确定要删除这条Hosts条目吗？\n${ip} ${domain}`,
                () => deleteHostsEntry(ip, domain)
            );
        });
    });
}

// 验证IP地址格式
function isValidIp(ip) {
    // 支持IPv4和IPv6简单验证
    const ipv4Regex = /^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$/;
    const ipv6Regex = /^([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}$/;
    
    return ipv4Regex.test(ip) || ipv6Regex.test(ip);
}