import {
  getUserInfoComponentContent,
  getUserInfoComponentStyles,
  getUserInfoComponentScript,
} from "./userInfoComponent";
import {
  getMoreOptionsComponentContent,
  getMoreOptionsComponentStyles,
  getMoreOptionsComponentScript,
} from "./moreOptionsComponent";
import {
  getSettingsComponentContent,
  getSettingsComponentStyles,
  getSettingsComponentScript,
} from "./settingsComponent";
import {
  userAvatarIconSvg,
  moreIconSvg,
  setting,
} from "../constants/toolIcons";

/**
 * 获取会话历史栏的 HTML 内容
 */
export function getConversationHistoryBarContent(): string {
  return `
    <div class="conversation-history-bar">
      <div class="history-dropdown-container">
        <button class="history-dropdown-button" onclick="toggleHistoryDropdown()">
          <span class="dropdown-label">历史对话</span>
          <svg class="dropdown-icon" viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg">
            <path d="M884 256h-75c-5.1 0-9.9 2.5-12.9 6.6L512 654.2 227.9 262.6c-3-4.1-7.8-6.6-12.9-6.6h-75c-6.5 0-10.3 7.4-6.5 12.7l352.6 486.1c12.8 17.6 39 17.6 51.7 0l352.6-486.1c3.9-5.3 0.1-12.7-6.4-12.7z" fill="currentColor"/>
          </svg>
        </button>

        <div class="history-dropdown-menu" id="historyDropdownMenu">
          <div class="history-list" id="historyList">
            <!-- 会话历史列表将在这里动态生成 -->
          </div>
        </div>
      </div>

      <div class="right-actions">
        <button class="new-conversation-button" onclick="createNewConversation()" title="新建对话">
          <svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
            <path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z" fill="currentColor"/>
          </svg>
        </button>

        <div class="user-info-container" style="display: none;">
        </div>

        <div class='setting'>
          <button class="setting-btn" title="设置" onclick="openSettingsModal()">
            ${setting}
          </button>
        </div>

        <div class='more-container'>
          <button class="more-button" title="更多选项" onclick="toggleMoreOptionsDropdown()">
            ${moreIconSvg}
          </button>
          ${getMoreOptionsComponentContent()}
        </div>
      </div>
    </div>

    ${getSettingsComponentContent()}
  `;
}

/**
 * 获取会话历史栏的 CSS 样式
 */
export function getConversationHistoryBarStyles(): string {
  return `
    .conversation-history-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 8px 16px;
      background: var(--vscode-tab-activeBackground);
      border-bottom: 1px solid var(--vscode-panel-border);
      flex-shrink: 0;
      min-height: 35px;
    }

    .history-dropdown-container {
      position: relative;
      flex: 1;
    }

    .right-actions {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .user-info-container {
      position: relative;
    }

    .user-avatar-icon-button {
      width: 30px;
      height: 30px;
      padding: 0;
      background: transparent;
      color: var(--vscode-foreground);
      border: none;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      flex-shrink: 0;
    }

    .user-avatar-icon-button:hover {
      background: var(--vscode-toolbar-hoverBackground);
      transform: scale(1.1);
    }

    .user-avatar-icon-button:active {
      transform: scale(0.95);
    }

    .user-avatar-icon-button.active {
      background: var(--vscode-toolbar-hoverBackground);
    }

    .user-avatar-icon-button svg {
      width: 20px;
      height: 20px;
    }

    ${getUserInfoComponentStyles()}

    ${getSettingsComponentStyles()}

    .setting {
      position: relative;
    }

    .setting-btn {
      width: 30px;
      height: 30px;
      padding: 0;
      background: transparent;
      color: var(--vscode-foreground);
      border: none;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      flex-shrink: 0;
    }

    .setting-btn:hover {
      background: var(--vscode-toolbar-hoverBackground);
      transform: scale(1.1);
    }

    .setting-btn:active {
      transform: scale(0.95);
    }

    .more-container {
      position: relative;
    }

    .more-button {
      width: 30px;
      height: 30px;
      padding: 0;
      background: transparent;
      color: var(--vscode-foreground);
      border: none;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      flex-shrink: 0;
    }

    .more-button:hover {
      background: var(--vscode-toolbar-hoverBackground);
      transform: scale(1.1);
    }

    .more-button:active {
      transform: scale(0.95);
    }

    .more-button.active {
      background: var(--vscode-toolbar-hoverBackground);
    }

    ${getMoreOptionsComponentStyles()}

    .history-dropdown-button {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 12px;
      background: transparent;
      color: var(--vscode-foreground);
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: 14px;
      transition: all 0.2s ease;
    }

    .history-dropdown-button:hover {
      background: var(--vscode-toolbar-hoverBackground);
    }

    .dropdown-label {
      white-space: nowrap;
    }

    .dropdown-icon {
      width: 12px;
      height: 12px;
      transition: transform 0.2s ease;
      flex-shrink: 0;
    }

    .history-dropdown-button.active .dropdown-icon {
      transform: rotate(180deg);
    }

    .history-dropdown-menu {
      position: absolute;
      top: calc(100% + 4px);
      left: 0;
      min-width: 300px;
      max-height: 400px;
      background: var(--vscode-dropdown-background);
      border: 1px solid var(--vscode-dropdown-border);
      border-radius: 4px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      max-height: 400px;
      overflow-y: auto;
      z-index: 1000;
      display: none;
    }

    .history-dropdown-menu.active {
      display: block;
    }

    .history-list {
      padding: 4px 0;
    }

    .history-item {
      padding: 10px 16px;
      cursor: pointer;
      transition: background 0.2s ease;
      border-bottom: 1px solid var(--vscode-panel-border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
    }

    .history-item:last-child {
      border-bottom: none;
    }

    .history-item:hover {
      background: var(--vscode-list-hoverBackground);
    }

    .history-item-title {
      font-size: 14px;
      font-weight: 500;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      flex: 1;
    }

    .history-item-time {
      font-size: 12px;
      opacity: 0.7;
      white-space: nowrap;
      flex-shrink: 0;
    }

    .history-empty {
      padding: 20px;
      text-align: center;
      color: var(--vscode-descriptionForeground);
      font-size: 14px;
    }

    .history-load-more {
      padding: 12px 16px;
      text-align: center;
      color: var(--vscode-descriptionForeground);
      font-size: 12px;
      border-top: 1px solid var(--vscode-panel-border);
    }

    .new-conversation-button {
      width: 30px;
      height: 30px;
      padding: 0;
      background: transparent;
      color: var(--vscode-foreground);
      border: none;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      flex-shrink: 0;
    }

    .new-conversation-button:hover {
      background: #007ACC;
      transform: scale(1.1);
    }

    .new-conversation-button:active {
      transform: scale(0.95);
    }

    .new-conversation-button svg {
      width: 20px;
      height: 20px;
    }

    /* 滚动条样式 */
    .history-dropdown-menu::-webkit-scrollbar {
      width: 8px;
    }

    .history-dropdown-menu::-webkit-scrollbar-track {
      background: transparent;
    }

    .history-dropdown-menu::-webkit-scrollbar-thumb {
      background: rgba(128, 128, 128, 0.5);
      border-radius: 4px;
    }

    .history-dropdown-menu::-webkit-scrollbar-thumb:hover {
      background: rgba(128, 128, 128, 0.7);
    }
  `;
}

/**
 * 获取会话历史栏的 JavaScript 脚本
 */
export function getConversationHistoryBarScript(): string {
  return `
    ${getUserInfoComponentScript()}

    ${getMoreOptionsComponentScript()}

    ${getSettingsComponentScript()}

    // 更新用户头像图标按钮显示
    function updateUserAvatarIconButton(userInfo) {
      const userAvatarIconButton = document.getElementById('userAvatarIconButton');

      if (userInfo && userInfo.nickname) {
        // 显示用户头像图标按钮
        if (userAvatarIconButton) {
          userAvatarIconButton.style.display = 'flex';
        }
        // 同时更新用户详情弹窗的数据
        if (typeof updateUserInfoDisplay === 'function') {
          updateUserInfoDisplay(userInfo);
        }
      } else {
        // 隐藏用户头像图标按钮
        if (userAvatarIconButton) {
          userAvatarIconButton.style.display = 'none';
        }
      }
    }

    // 会话历史相关变量
    let conversationHistory = [];
    let currentConversationId = null;
    let currentOffset = 0;
    let totalHistory = 0;
    let hasMoreHistory = false;
    let isLoadingHistory = false;
    let currentLoadRequestId = 0;  // 请求 ID，用于防止并发加载
    const HISTORY_PAGE_SIZE = 10;
    const MAX_HISTORY_ITEMS = 100;

    // 切换历史记录下拉菜单
    function toggleHistoryDropdown() {
      const menu = document.getElementById('historyDropdownMenu');
      const button = document.querySelector('.history-dropdown-button');

      if (menu.classList.contains('active')) {
        menu.classList.remove('active');
        button.classList.remove('active');
      } else {
        menu.classList.add('active');
        button.classList.add('active');
        // 重置并加载会话历史
        resetAndLoadHistory();
      }
    }

    // 重置并加载会话历史
    function resetAndLoadHistory() {
      conversationHistory = [];
      currentOffset = 0;
      totalHistory = 0;
      hasMoreHistory = false;
      const historyList = document.getElementById('historyList');
      if (historyList) {
        historyList.innerHTML = '<div class="history-empty">加载中...</div>';
      }
      loadMoreHistory();
    }

    // 加载更多会话历史
    function loadMoreHistory() {
      if (isLoadingHistory || (currentOffset > 0 && !hasMoreHistory)) {
        return;
      }

      // 检查是否已达到最大数量
      if (currentOffset >= MAX_HISTORY_ITEMS) {
        return;
      }

      // 生成新的请求 ID，用于防止并发加载
      const requestId = ++currentLoadRequestId;

      isLoadingHistory = true;
      vscode.postMessage({
        command: 'loadConversationHistory',
        offset: currentOffset,
        limit: HISTORY_PAGE_SIZE,
        requestId: requestId
      });
    }

    // 渲染会话历史列表（支持追加）
    function renderConversationHistory(data) {
      isLoadingHistory = false;

      if (!data || !data.items) {
        return;
      }

      // 追加新数据（去重）
      const existingIds = new Set(conversationHistory.map(item => item.id));
      const newItems = [];
      for (const item of data.items) {
        if (!existingIds.has(item.id)) {
          existingIds.add(item.id);
          newItems.push(item);
        }
      }
      conversationHistory = conversationHistory.concat(newItems);
      totalHistory = data.total;
      hasMoreHistory = data.hasMore;
      currentOffset = conversationHistory.length;

      const historyList = document.getElementById('historyList');
      if (!historyList) {
        return;
      }

      // 如果没有任何历史记录
      if (conversationHistory.length === 0) {
        historyList.innerHTML = '<div class="history-empty">暂无会话历史</div>';
        return;
      }

      // 渲染所有历史记录
      historyList.innerHTML = conversationHistory.map(item => \`
        <div class="history-item" onclick="selectConversation('\${item.id}')">
          <div class="history-item-title">\${item.title || '未命名会话'}</div>
          <div class="history-item-time">\${formatTime(item.timestamp)}</div>
        </div>
      \`).join('');

      // 如果还有更多数据，添加"加载更多"提示
      if (hasMoreHistory && currentOffset < MAX_HISTORY_ITEMS) {
        historyList.innerHTML += \`
          <div class="history-load-more" id="loadMoreIndicator">
            <span>滚动加载更多...</span>
          </div>
        \`;
      } else if (currentOffset >= MAX_HISTORY_ITEMS && hasMoreHistory) {
        historyList.innerHTML += \`
          <div class="history-load-more">
            <span>已显示最近 \${MAX_HISTORY_ITEMS} 条记录</span>
          </div>
        \`;
      }
    }

    // 选择会话
    function selectConversation(conversationId) {
      currentConversationId = conversationId;
      vscode.postMessage({
        command: 'selectConversation',
        conversationId: conversationId
      });

      // 关闭下拉菜单
      const menu = document.getElementById('historyDropdownMenu');
      const button = document.querySelector('.history-dropdown-button');
      menu.classList.remove('active');
      button.classList.remove('active');
    }

    // 创建新会话
    function createNewConversation() {
      vscode.postMessage({ command: 'createNewConversation' });
    }

    // 格式化时间
    function formatTime(timestamp) {
      const date = new Date(timestamp);
      const now = new Date();
      const diff = now - date;

      // 小于1分钟
      if (diff < 60000) {
        return '刚刚';
      }
      // 小于1小时
      if (diff < 3600000) {
        return Math.floor(diff / 60000) + '分钟前';
      }
      // 小于1天
      if (diff < 86400000) {
        return Math.floor(diff / 3600000) + '小时前';
      }
      // 小于7天
      if (diff < 604800000) {
        return Math.floor(diff / 86400000) + '天前';
      }

      // 超过7天显示具体日期
      return date.toLocaleDateString('zh-CN', {
        year: 'numeric',
        month: '2-digit',
        day: '2-digit'
      });
    }

    // 监听下拉菜单滚动事件（防止重复注册）
    const historyDropdownMenu = document.getElementById('historyDropdownMenu');
    if (historyDropdownMenu && !historyDropdownMenu._scrollListenerAdded) {
      historyDropdownMenu._scrollListenerAdded = true;
      historyDropdownMenu.addEventListener('scroll', () => {
        const menu = historyDropdownMenu;
        const scrollTop = menu.scrollTop;
        const scrollHeight = menu.scrollHeight;
        const clientHeight = menu.clientHeight;

        // 当滚动到距离底部 50px 时，加载更多
        if (scrollHeight - scrollTop - clientHeight < 50) {
          loadMoreHistory();
        }
      });
    }

    // 点击外部关闭下拉菜单
    document.addEventListener('click', (event) => {
      const container = document.querySelector('.history-dropdown-container');
      const menu = document.getElementById('historyDropdownMenu');
      const button = document.querySelector('.history-dropdown-button');

      if (menu && menu.classList.contains('active')) {
        if (!container.contains(event.target)) {
          menu.classList.remove('active');
          button.classList.remove('active');
        }
      }
    });
  `;
}