// 屏蔽管理页面功能实现

// 初始化屏蔽管理页面
function initShieldPage() {
  // 加载屏蔽规则统计信息
  loadShieldStats();
  // 加载本地规则
  loadLocalRules();
  // 加载远程黑名单
  loadRemoteBlacklists();
  // 设置事件监听器
  setupShieldEventListeners();
}

// 加载屏蔽规则统计信息
async function loadShieldStats() {
  showLoading('加载屏蔽规则统计信息...');
  try {
    const response = await fetch('/api/shield');
    
    if (!response.ok) {
      throw new Error(`加载失败: ${response.status}`);
    }
    
    const stats = await response.json();
    
    // 更新统计信息
    const elements = [
      { id: 'domain-rules-count', value: stats.domainRulesCount },
      { id: 'domain-exceptions-count', value: stats.domainExceptionsCount },
      { id: 'regex-rules-count', value: stats.regexRulesCount },
      { id: 'regex-exceptions-count', value: stats.regexExceptionsCount },
      { id: 'hosts-rules-count', value: stats.hostsRulesCount },
      { id: 'blacklist-count', value: stats.blacklistCount }
    ];
    
    elements.forEach(item => {
      const element = document.getElementById(item.id);
      if (element) {
        element.textContent = item.value || 0;
      }
    });
    
    hideLoading();
  } catch (error) {
    console.error('加载屏蔽规则统计信息失败:', error);
    showErrorMessage('加载屏蔽规则统计信息失败');
    hideLoading();
  }
}

// 加载本地规则
async function loadLocalRules() {
  showLoading('加载本地规则...');
  try {
    const response = await fetch('/api/shield/localrules');
    
    if (!response.ok) {
      throw new Error(`加载失败: ${response.status}`);
    }
    
    const data = await response.json();
    
    // 更新本地规则数量显示
    if (document.getElementById('local-rules-count')) {
      document.getElementById('local-rules-count').textContent = data.localRulesCount || 0;
    }
    
    // 设置当前规则类型
    currentRulesType = 'local';
    
    // 合并所有本地规则
    let rules = [];
    // 添加域名规则
    if (Array.isArray(data.domainRules)) {
      rules = rules.concat(data.domainRules);
    }
    // 添加域名排除规则
    if (Array.isArray(data.domainExceptions)) {
      rules = rules.concat(data.domainExceptions);
    }
    // 添加正则规则
    if (Array.isArray(data.regexRules)) {
      rules = rules.concat(data.regexRules);
    }
    // 添加正则排除规则
    if (Array.isArray(data.regexExceptions)) {
      rules = rules.concat(data.regexExceptions);
    }
    
    updateRulesTable(rules);
    hideLoading();
  } catch (error) {
    console.error('加载本地规则失败:', error);
    showErrorMessage('加载本地规则失败');
    hideLoading();
  }
}

// 加载远程规则
async function loadRemoteRules() {
  showLoading('加载远程规则...');
  try {
    // 设置当前规则类型
    currentRulesType = 'remote';
    const response = await fetch('/api/shield/remoterules');
    
    if (!response.ok) {
      throw new Error(`加载失败: ${response.status}`);
    }
    
    const data = await response.json();
    
    // 更新远程规则数量显示
    if (document.getElementById('remote-rules-count')) {
      document.getElementById('remote-rules-count').textContent = data.remoteRulesCount || 0;
    }
    
    // 合并所有远程规则
    let rules = [];
    // 添加域名规则
    if (Array.isArray(data.domainRules)) {
      rules = rules.concat(data.domainRules);
    }
    // 添加域名排除规则
    if (Array.isArray(data.domainExceptions)) {
      rules = rules.concat(data.domainExceptions);
    }
    // 添加正则规则
    if (Array.isArray(data.regexRules)) {
      rules = rules.concat(data.regexRules);
    }
    // 添加正则排除规则
    if (Array.isArray(data.regexExceptions)) {
      rules = rules.concat(data.regexExceptions);
    }
    
    updateRulesTable(rules);
    hideLoading();
  } catch (error) {
    console.error('加载远程规则失败:', error);
    showErrorMessage('加载远程规则失败');
    hideLoading();
  }
}

// 更新规则表格
function updateRulesTable(rules) {
  const tbody = document.getElementById('rules-table-body');
  
  // 清空表格
  tbody.innerHTML = '';
  
  if (rules.length === 0) {
    const emptyRow = document.createElement('tr');
    emptyRow.innerHTML = '<td colspan="2" class="py-4 text-center text-gray-500">暂无规则</td>';
    tbody.appendChild(emptyRow);
    return;
  }
  
  // 对于大量规则，限制显示数量
  const maxRulesToShow = 1000; // 限制最大显示数量
  const rulesToShow = rules.length > maxRulesToShow ? rules.slice(0, maxRulesToShow) : rules;
  
  // 使用DocumentFragment提高性能
  const fragment = document.createDocumentFragment();
  
  rulesToShow.forEach(rule => {
    const tr = document.createElement('tr');
    tr.className = 'border-b border-gray-200';
    
    const tdRule = document.createElement('td');
    tdRule.className = 'py-3 px-4';
    tdRule.textContent = rule;
    
    const tdAction = document.createElement('td');
    tdAction.className = 'py-3 px-4 text-right';
    
    const deleteBtn = document.createElement('button');
    deleteBtn.className = 'delete-rule-btn px-3 py-1 bg-danger text-white rounded-md hover:bg-danger/90 transition-colors text-sm';
    deleteBtn.dataset.rule = rule;
    deleteBtn.innerHTML = '<i class="fa fa-trash"></i>';
    deleteBtn.addEventListener('click', handleDeleteRule);
    
    tdAction.appendChild(deleteBtn);
    tr.appendChild(tdRule);
    tr.appendChild(tdAction);
    fragment.appendChild(tr);
  });
  
  // 一次性添加所有行到DOM
  tbody.appendChild(fragment);
  
  // 如果有更多规则，添加提示
  if (rules.length > maxRulesToShow) {
    const infoRow = document.createElement('tr');
    infoRow.innerHTML = `<td colspan="2" class="py-4 text-center text-gray-500">显示前 ${maxRulesToShow} 条规则，共 ${rules.length} 条</td>`;
    tbody.appendChild(infoRow);
  }
}

// 处理删除规则
async function handleDeleteRule(e) {
  const rule = e.target.closest('.delete-rule-btn').dataset.rule;
  showLoading('删除规则中...');
  try {
    const response = await fetch('/api/shield', {
      method: 'DELETE',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ rule })
    });
    
    if (!response.ok) {
      throw new Error('Failed to delete rule');
    }
    
    showSuccessMessage('规则删除成功');
    // 根据当前显示的规则类型重新加载对应的规则列表
    if (currentRulesType === 'local') {
      loadLocalRules();
    } else {
      loadRemoteRules();
    }
    // 重新加载统计信息
    loadShieldStats();
    hideLoading();
  } catch (error) {
    console.error('Error deleting rule:', error);
    showErrorMessage('删除规则失败');
    hideLoading();
  }
}

// 添加新规则
async function handleAddRule() {
  const rule = document.getElementById('new-rule').value.trim();
  if (!rule) {
    showErrorMessage('规则不能为空');
    return;
  }
  
  showLoading('添加规则中...');
  try {
    const response = await fetch('/api/shield', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ rule })
    });
    
    if (!response.ok) {
      throw new Error('Failed to add rule');
    }
    
    showSuccessMessage('规则添加成功');
    // 清空输入框
    document.getElementById('new-rule').value = '';
    // 重新加载规则
    loadLocalRules();
    // 重新加载统计信息
    loadShieldStats();
    hideLoading();
  } catch (error) {
    console.error('Error adding rule:', error);
    showErrorMessage('添加规则失败');
    hideLoading();
  }
}

// 加载远程黑名单
async function loadRemoteBlacklists() {
  showLoading('加载远程黑名单...');
  try {
    const response = await fetch('/api/shield/blacklists');
    
    if (!response.ok) {
      throw new Error(`加载失败: ${response.status}`);
    }
    
    const blacklists = await response.json();
    
    // 确保blacklists是数组
    const blacklistArray = Array.isArray(blacklists) ? blacklists : [];
    updateBlacklistsTable(blacklistArray);
    hideLoading();
  } catch (error) {
    console.error('加载远程黑名单失败:', error);
    showErrorMessage('加载远程黑名单失败');
    hideLoading();
  }
}

// 判断黑名单是否过期（超过24小时未更新视为过期）
function isBlacklistExpired(lastUpdateTime) {
  if (!lastUpdateTime) {
    return true; // 从未更新过，视为过期
  }
  
  const lastUpdate = new Date(lastUpdateTime);
  const now = new Date();
  const hoursDiff = (now - lastUpdate) / (1000 * 60 * 60);
  
  return hoursDiff > 24; // 超过24小时视为过期
}

// 更新黑名单表格
function updateBlacklistsTable(blacklists) {
  const tbody = document.getElementById('blacklists-table-body');
  
  // 清空表格
  tbody.innerHTML = '';
  
  // 检查黑名单数据是否为空
  if (!blacklists || blacklists.length === 0) {
    const emptyRow = document.createElement('tr');
    emptyRow.innerHTML = '<tr><td colspan="4" class="py-4 text-center text-gray-500">暂无黑名单</td></tr>';
    tbody.appendChild(emptyRow);
    return;
  }
  
  // 对于大量黑名单，限制显示数量
  const maxBlacklistsToShow = 100; // 限制最大显示数量
  const blacklistsToShow = blacklists.length > maxBlacklistsToShow ? blacklists.slice(0, maxBlacklistsToShow) : blacklists;
  
  // 使用DocumentFragment提高性能
  const fragment = document.createDocumentFragment();
  
  blacklistsToShow.forEach(blacklist => {
    const tr = document.createElement('tr');
    tr.className = 'border-b border-gray-200 hover:bg-gray-50';
    
    // 名称单元格
    const tdName = document.createElement('td');
    tdName.className = 'py-3 px-4';
    tdName.textContent = blacklist.Name || '未命名';
    
    // URL单元格
    const tdUrl = document.createElement('td');
    tdUrl.className = 'py-3 px-4 truncate max-w-xs';
    tdUrl.textContent = blacklist.URL;
    
    // 状态单元格
    const tdStatus = document.createElement('td');
    tdStatus.className = 'py-3 px-4 text-center';
    
    // 判断状态颜色：绿色（正常）、黄色（过期）、灰色（禁用）
    let statusColor = 'bg-gray-300'; // 默认禁用
    let statusText = '禁用';
    
    if (blacklist.Enabled) {
      const expired = isBlacklistExpired(blacklist.lastUpdateTime || blacklist.LastUpdateTime);
      if (expired) {
        statusColor = 'bg-warning'; // 黄色表示过期
        statusText = '过期';
      } else {
        statusColor = 'bg-success'; // 绿色表示正常
        statusText = '正常';
      }
    }
    
    const statusContainer = document.createElement('div');
    statusContainer.className = 'flex items-center justify-center';
    
    const statusDot = document.createElement('span');
    statusDot.className = `inline-block w-3 h-3 rounded-full ${statusColor}`;
    statusDot.title = statusText;
    
    const statusTextSpan = document.createElement('span');
    statusTextSpan.className = 'text-sm ml-2';
    statusTextSpan.textContent = statusText;
    
    statusContainer.appendChild(statusDot);
    statusContainer.appendChild(statusTextSpan);
    tdStatus.appendChild(statusContainer);
    
    // 操作单元格
    const tdActions = document.createElement('td');
    tdActions.className = 'py-3 px-4 text-right space-x-2';
    
    // 刷新按钮
    const refreshBtn = document.createElement('button');
    refreshBtn.className = 'update-blacklist-btn px-3 py-1 bg-primary text-white rounded-md hover:bg-primary/90 transition-colors text-sm';
    refreshBtn.dataset.url = blacklist.URL;
    refreshBtn.innerHTML = '<i class="fa fa-refresh"></i>';
    refreshBtn.title = '刷新黑名单';
    refreshBtn.addEventListener('click', handleUpdateBlacklist);
    
    // 删除按钮
    const deleteBtn = document.createElement('button');
    deleteBtn.className = 'delete-blacklist-btn px-3 py-1 bg-danger text-white rounded-md hover:bg-danger/90 transition-colors text-sm';
    deleteBtn.dataset.url = blacklist.URL;
    deleteBtn.innerHTML = '<i class="fa fa-trash"></i>';
    deleteBtn.title = '删除黑名单';
    deleteBtn.addEventListener('click', handleDeleteBlacklist);
    
    tdActions.appendChild(refreshBtn);
    tdActions.appendChild(deleteBtn);
    
    tr.appendChild(tdName);
    tr.appendChild(tdUrl);
    tr.appendChild(tdStatus);
    tr.appendChild(tdActions);
    fragment.appendChild(tr);
  });
  
  // 一次性添加所有行到DOM
  tbody.appendChild(fragment);
  
  // 如果有更多黑名单，添加提示
  if (blacklists.length > maxBlacklistsToShow) {
    const infoRow = document.createElement('tr');
    infoRow.innerHTML = `<td colspan="4" class="py-4 text-center text-gray-500">显示前 ${maxBlacklistsToShow} 个黑名单，共 ${blacklists.length} 个</td>`;
    tbody.appendChild(infoRow);
  }
}

// 处理更新单个黑名单
async function handleUpdateBlacklist(e) {
  const url = e.target.closest('.update-blacklist-btn').dataset.url;
  
  if (!url) {
    showToast('无效的黑名单URL', 'error');
    return;
  }
  
  showLoading('更新黑名单中...');
  try {
    const response = await fetch(`/api/shield/blacklists/${encodeURIComponent(url)}/update`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      }
    });
    
    if (!response.ok) {
      const errorData = await response.json().catch(() => ({}));
      throw new Error(errorData.error || 'Failed to update blacklist');
    }
    
    // 重新加载黑名单
    loadRemoteBlacklists();
    // 重新加载统计信息
    loadShieldStats();
    showToast('黑名单更新成功');
  } catch (error) {
    console.error('更新黑名单失败:', error);
    showToast('更新黑名单失败: ' + error.message, 'error');
  } finally {
    hideLoading();
  }
}

// 处理删除黑名单
async function handleDeleteBlacklist(e) {
  const url = e.target.closest('.delete-blacklist-btn').dataset.url;
  
  if (!url) {
    showToast('无效的黑名单URL', 'error');
    return;
  }
  
  // 确认删除
  if (!confirm('确定要删除这个黑名单吗？删除后将无法恢复。')) {
    return;
  }
  
  showLoading('删除黑名单中...');
  try {
    const response = await fetch(`/api/shield/blacklists/${encodeURIComponent(url)}`, {
      method: 'DELETE',
      headers: {
        'Content-Type': 'application/json'
      }
    });
    
    if (!response.ok) {
      const errorData = await response.json().catch(() => ({}));
      throw new Error(errorData.error || 'Failed to delete blacklist');
    }
    
    // 重新加载黑名单
    loadRemoteBlacklists();
    // 重新加载统计信息
    loadShieldStats();
    showToast('黑名单删除成功');
  } catch (error) {
    console.error('删除黑名单失败:', error);
    showToast('删除黑名单失败: ' + error.message, 'error');
  } finally {
    hideLoading();
  }
}

// 处理添加黑名单
async function handleAddBlacklist(event) {
  // 如果存在event参数，则调用preventDefault()防止表单默认提交
  if (event && typeof event.preventDefault === 'function') {
    event.preventDefault();
  }
  
  const nameInput = document.getElementById('blacklist-name');
  const urlInput = document.getElementById('blacklist-url');
  
  const name = nameInput ? nameInput.value.trim() : '';
  const url = urlInput ? urlInput.value.trim() : '';
  
  // 简单验证
  if (!name || !url) {
    showErrorMessage('名称和URL不能为空');
    return;
  }
  
  // 验证URL格式
  try {
    new URL(url);
  } catch (e) {
    showErrorMessage('URL格式不正确');
    return;
  }
  
  showLoading('添加黑名单中...');
  try {
    const response = await fetch('/api/shield/blacklists', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ name, url })
    });
    
    if (!response.ok) {
      // 尝试从响应中获取更详细的错误信息
      let errorMessage = '添加黑名单失败';
      try {
        const errorData = await response.json();
        if (errorData.error) {
          errorMessage = errorData.error;
        }
      } catch (jsonError) {
        // 忽略JSON解析错误
      }
      throw new Error(errorMessage);
    }
    
    showSuccessMessage('黑名单添加成功');
    // 清空输入框
    if (nameInput) nameInput.value = '';
    if (urlInput) urlInput.value = '';
    // 重新加载黑名单
    loadRemoteBlacklists();
    // 重新加载统计信息
    loadShieldStats();
    hideLoading();
  } catch (error) {
    console.error('Error adding blacklist:', error);
    showErrorMessage(error.message || '添加黑名单失败');
    hideLoading();
  }
}



// 当前显示的规则类型：'local' 或 'remote'
let currentRulesType = 'local';

// 设置事件监听器
function setupShieldEventListeners() {
  // 本地规则管理事件
  document.getElementById('save-rule-btn').addEventListener('click', handleAddRule);
  
  // 远程黑名单管理事件
  document.getElementById('save-blacklist-btn').addEventListener('click', handleAddBlacklist);
  
  // 添加切换查看本地规则和远程规则的事件监听
  if (document.getElementById('view-local-rules-btn')) {
    document.getElementById('view-local-rules-btn').addEventListener('click', loadLocalRules);
  }
  
  if (document.getElementById('view-remote-rules-btn')) {
    document.getElementById('view-remote-rules-btn').addEventListener('click', loadRemoteRules);
  }
}

// 显示成功消息
function showSuccessMessage(message) {
  showNotification(message, 'success');
}

// 显示错误消息
function showErrorMessage(message) {
  showNotification(message, 'error');
}

// 显示加载状态
function showLoading(message = '加载中...') {
  // 移除现有加载状态
  hideLoading();
  
  // 创建加载状态元素
  const loading = document.createElement('div');
  loading.className = 'loading-overlay fixed inset-0 bg-black/50 flex items-center justify-center z-50';
  loading.innerHTML = `
    <div class="bg-white rounded-lg p-6 shadow-lg flex items-center space-x-4">
      <div class="animate-spin rounded-full h-8 w-8 border-b-2 border-primary"></div>
      <span class="text-gray-700 font-medium">${message}</span>
    </div>
  `;
  
  document.body.appendChild(loading);
}

// 隐藏加载状态
function hideLoading() {
  const loading = document.querySelector('.loading-overlay');
  if (loading) {
    loading.remove();
  }
}

// 显示通知
function showNotification(message, type = 'info') {
  // 移除现有通知
  const existingNotification = document.querySelector('.notification');
  if (existingNotification) {
    existingNotification.remove();
  }
  
  // 创建新通知
  const notification = document.createElement('div');
  notification.className = `notification fixed bottom-4 right-4 px-6 py-3 rounded-lg shadow-lg z-50 transform transition-all duration-300 ease-in-out translate-y-0 opacity-0`;
  
  // 设置通知样式
  if (type === 'success') {
    notification.classList.add('bg-green-500', 'text-white');
  } else if (type === 'error') {
    notification.classList.add('bg-red-500', 'text-white');
  } else {
    notification.classList.add('bg-blue-500', 'text-white');
  }
  
  notification.innerHTML = `
    <div class="flex items-center space-x-2">
      <i class="fa ${type === 'success' ? 'fa-check-circle' : type === 'error' ? 'fa-exclamation-circle' : 'fa-info-circle'}"></i>
      <span>${message}</span>
    </div>
  `;
  
  document.body.appendChild(notification);
  
  // 显示通知
  setTimeout(() => {
    notification.classList.remove('opacity-0');
    notification.classList.add('opacity-100');
  }, 10);
  
  // 3秒后隐藏通知
  setTimeout(() => {
    notification.classList.remove('opacity-100');
    notification.classList.add('opacity-0');
    setTimeout(() => {
      notification.remove();
    }, 300);
  }, 3000);
}

// 页面加载完成后初始化
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', initShieldPage);
} else {
  initShieldPage();
}

// 当切换到屏蔽管理页面时重新加载数据
document.addEventListener('DOMContentLoaded', () => {
  // 监听hash变化，当切换到屏蔽管理页面时重新加载数据
  window.addEventListener('hashchange', () => {
    if (window.location.hash === '#shield') {
      initShieldPage();
    }
  });
});