// 消息交互管理器 - 微信小程序专用
// 处理消息表情回应、引用回复、撤回、转发等交互功能

const apiClient = require('./api-client.js');

/**
 * 消息交互管理器
 * 功能：
 * 1. 消息表情回应
 * 2. 消息引用回复
 * 3. 消息撤回功能
 * 4. 消息转发功能
 * 5. 消息收藏功能
 * 6. 消息多选操作
 */
class MessageInteractionManager {
  constructor() {
    this.isInitialized = false;
    
    // 交互配置
    this.interactionConfig = {
      // 表情回应配置
      reactions: {
        enabled: true,
        maxReactions: 6, // 每条消息最多6种表情
        maxUsersPerReaction: 100, // 每种表情最多100个用户
        commonEmojis: ['👍', '❤️', '😂', '😮', '😢', '😡'], // 常用表情
        customEmojis: [] // 自定义表情
      },
      
      // 引用回复配置
      quote: {
        enabled: true,
        maxQuoteLength: 100, // 引用内容最大长度
        showOriginalSender: true, // 显示原发送者
        showTimestamp: true // 显示时间戳
      },
      
      // 撤回配置
      recall: {
        enabled: true,
        timeLimit: 2 * 60 * 1000, // 2分钟内可撤回
        showRecallMessage: true, // 显示撤回提示
        allowRecallOthers: false // 是否允许撤回他人消息（群主/管理员）
      },
      
      // 转发配置
      forward: {
        enabled: true,
        maxForwardCount: 5, // 最多同时转发5条消息
        preserveFormat: true, // 保持原格式
        showForwardSource: true // 显示转发来源
      },
      
      // 收藏配置
      favorite: {
        enabled: true,
        maxFavorites: 1000, // 最多收藏1000条
        syncToCloud: true // 同步到云端
      }
    };
    
    // 当前操作状态
    this.currentOperation = {
      type: null, // 'reaction', 'quote', 'forward', 'select'
      messageId: null,
      data: null
    };
    
    // 多选状态
    this.multiSelectMode = false;
    this.selectedMessages = new Set();
    
    // 表情回应缓存
    this.reactionsCache = new Map();
    
    this.init();
  }

  // 初始化交互管理器
  async init() {
    if (this.isInitialized) return;
    
    console.log('✨ 初始化消息交互管理器...');
    
    try {
      // 加载用户收藏
      await this.loadUserFavorites();
      
      // 加载表情回应缓存
      await this.loadReactionsCache();
      
      this.isInitialized = true;
      console.log('✅ 消息交互管理器初始化完成');
      
    } catch (error) {
      console.error('❌ 消息交互管理器初始化失败:', error);
    }
  }

  // 👍 ===== 表情回应功能 =====

  // 添加表情回应
  async addReaction(messageId, emoji, userId) {
    try {
      console.log('👍 添加表情回应:', messageId, emoji, userId);
      
      // 验证参数
      if (!messageId || !emoji || !userId) {
        throw new Error('参数不完整');
      }
      
      // 检查是否已经回应过
      const existingReaction = await this.getUserReaction(messageId, userId);
      if (existingReaction === emoji) {
        console.log('⚠️ 用户已经添加过相同表情');
        return { success: false, error: '已经添加过相同表情' };
      }
      
      // 如果用户已有其他表情回应，先移除
      if (existingReaction) {
        await this.removeReaction(messageId, existingReaction, userId);
      }
      
      // 调用API添加表情回应
      const response = await apiClient.request({
        url: '/api/v1/messages/reactions',
        method: 'POST',
        data: {
          messageId: messageId,
          emoji: emoji,
          userId: userId
        }
      });
      
      if (response.success) {
        // 更新本地缓存
        this.updateReactionCache(messageId, emoji, userId, 'add');
        
        console.log('✅ 表情回应添加成功');
        return { success: true, data: response.data };
      } else {
        throw new Error(response.error || '添加表情回应失败');
      }
      
    } catch (error) {
      console.error('❌ 添加表情回应失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 移除表情回应
  async removeReaction(messageId, emoji, userId) {
    try {
      console.log('👎 移除表情回应:', messageId, emoji, userId);
      
      // 调用API移除表情回应
      const response = await apiClient.request({
        url: '/api/v1/messages/reactions',
        method: 'DELETE',
        data: {
          messageId: messageId,
          emoji: emoji,
          userId: userId
        }
      });
      
      if (response.success) {
        // 更新本地缓存
        this.updateReactionCache(messageId, emoji, userId, 'remove');
        
        console.log('✅ 表情回应移除成功');
        return { success: true };
      } else {
        throw new Error(response.error || '移除表情回应失败');
      }
      
    } catch (error) {
      console.error('❌ 移除表情回应失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 获取消息的所有表情回应
  async getMessageReactions(messageId) {
    try {
      // 先从缓存获取
      const cached = this.reactionsCache.get(messageId);
      if (cached && (Date.now() - cached.timestamp) < 60000) { // 1分钟缓存
        return { success: true, data: cached.reactions };
      }
      
      // 从服务器获取
      const response = await apiClient.request({
        url: `/api/v1/messages/${messageId}/reactions`,
        method: 'GET'
      });
      
      if (response.success) {
        const reactions = response.data || [];
        
        // 更新缓存
        this.reactionsCache.set(messageId, {
          reactions: reactions,
          timestamp: Date.now()
        });
        
        return { success: true, data: reactions };
      } else {
        throw new Error(response.error || '获取表情回应失败');
      }
      
    } catch (error) {
      console.error('❌ 获取表情回应失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 获取用户对消息的表情回应
  async getUserReaction(messageId, userId) {
    try {
      const result = await this.getMessageReactions(messageId);
      if (result.success) {
        const userReaction = result.data.find(reaction => 
          reaction.users && reaction.users.includes(userId)
        );
        return userReaction ? userReaction.emoji : null;
      }
      return null;
    } catch (error) {
      console.error('❌ 获取用户表情回应失败:', error);
      return null;
    }
  }

  // 更新表情回应缓存
  updateReactionCache(messageId, emoji, userId, action) {
    const cached = this.reactionsCache.get(messageId);
    if (!cached) return;
    
    let reactions = cached.reactions;
    let emojiReaction = reactions.find(r => r.emoji === emoji);
    
    if (action === 'add') {
      if (emojiReaction) {
        // 添加用户到现有表情
        if (!emojiReaction.users.includes(userId)) {
          emojiReaction.users.push(userId);
          emojiReaction.count = emojiReaction.users.length;
        }
      } else {
        // 创建新的表情回应
        reactions.push({
          emoji: emoji,
          count: 1,
          users: [userId]
        });
      }
    } else if (action === 'remove') {
      if (emojiReaction) {
        // 从表情中移除用户
        emojiReaction.users = emojiReaction.users.filter(id => id !== userId);
        emojiReaction.count = emojiReaction.users.length;
        
        // 如果没有用户了，移除整个表情
        if (emojiReaction.count === 0) {
          reactions = reactions.filter(r => r.emoji !== emoji);
        }
      }
    }
    
    // 更新缓存
    this.reactionsCache.set(messageId, {
      reactions: reactions,
      timestamp: Date.now()
    });
  }

  // 💬 ===== 引用回复功能 =====

  // 创建引用回复
  createQuoteReply(originalMessage, replyContent) {
    try {
      console.log('💬 创建引用回复:', originalMessage.messageId);
      
      // 生成引用内容
      const quoteContent = this.generateQuoteContent(originalMessage);
      
      // 构建引用回复消息
      const quoteReply = {
        type: 'quote',
        content: replyContent,
        quote: {
          messageId: originalMessage.messageId,
          senderId: originalMessage.senderId,
          senderName: originalMessage.senderName,
          content: quoteContent,
          timestamp: originalMessage.timestamp,
          msgType: originalMessage.msgType
        }
      };
      
      console.log('✅ 引用回复创建成功');
      return { success: true, data: quoteReply };
      
    } catch (error) {
      console.error('❌ 创建引用回复失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 生成引用内容
  generateQuoteContent(message) {
    let content = '';
    
    switch (message.msgType) {
      case 'text':
        content = message.content;
        // 限制长度
        if (content.length > this.interactionConfig.quote.maxQuoteLength) {
          content = content.substring(0, this.interactionConfig.quote.maxQuoteLength) + '...';
        }
        break;
      case 'image':
        content = '[图片]';
        break;
      case 'video':
        content = '[视频]';
        break;
      case 'voice':
        content = '[语音]';
        break;
      case 'file':
        content = '[文件]';
        break;
      case 'location':
        content = '[位置]';
        break;
      default:
        content = '[消息]';
    }
    
    return content;
  }

  // 🔄 ===== 消息撤回功能 =====

  // 撤回消息
  async recallMessage(messageId, userId) {
    try {
      console.log('🔄 撤回消息:', messageId, userId);
      
      // 检查撤回权限和时间限制
      const canRecall = await this.checkRecallPermission(messageId, userId);
      if (!canRecall.allowed) {
        return { success: false, error: canRecall.reason };
      }
      
      // 调用API撤回消息
      const response = await apiClient.request({
        url: `/api/v1/messages/${messageId}/recall`,
        method: 'POST',
        data: {
          userId: userId
        }
      });
      
      if (response.success) {
        console.log('✅ 消息撤回成功');
        return { success: true, data: response.data };
      } else {
        throw new Error(response.error || '撤回消息失败');
      }
      
    } catch (error) {
      console.error('❌ 撤回消息失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 检查撤回权限
  async checkRecallPermission(messageId, userId) {
    try {
      // 获取消息信息
      const messageInfo = await this.getMessageInfo(messageId);
      if (!messageInfo) {
        return { allowed: false, reason: '消息不存在' };
      }
      
      // 检查是否是消息发送者
      if (messageInfo.senderId !== userId) {
        // 检查是否有管理员权限
        if (!this.interactionConfig.recall.allowRecallOthers) {
          return { allowed: false, reason: '只能撤回自己的消息' };
        }
      }
      
      // 检查时间限制
      const now = Date.now();
      const messageTime = messageInfo.timestamp;
      const timeDiff = now - messageTime;
      
      if (timeDiff > this.interactionConfig.recall.timeLimit) {
        return { allowed: false, reason: '超过撤回时间限制' };
      }
      
      return { allowed: true };
      
    } catch (error) {
      console.error('❌ 检查撤回权限失败:', error);
      return { allowed: false, reason: '检查权限失败' };
    }
  }

  // 📤 ===== 消息转发功能 =====

  // 转发消息
  async forwardMessages(messageIds, targetConversations) {
    try {
      console.log('📤 转发消息:', messageIds, targetConversations);
      
      // 验证参数
      if (!messageIds.length || !targetConversations.length) {
        throw new Error('参数不完整');
      }
      
      // 检查转发数量限制
      if (messageIds.length > this.interactionConfig.forward.maxForwardCount) {
        throw new Error(`最多只能同时转发${this.interactionConfig.forward.maxForwardCount}条消息`);
      }
      
      // 获取消息详情
      const messages = await this.getMessagesInfo(messageIds);
      if (!messages.length) {
        throw new Error('获取消息信息失败');
      }
      
      // 执行转发
      const results = [];
      for (const targetId of targetConversations) {
        const result = await this.forwardToConversation(messages, targetId);
        results.push({
          targetId: targetId,
          success: result.success,
          error: result.error
        });
      }
      
      console.log('✅ 消息转发完成');
      return { success: true, data: results };
      
    } catch (error) {
      console.error('❌ 转发消息失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 转发到指定会话
  async forwardToConversation(messages, targetConversationId) {
    try {
      // 构建转发消息
      const forwardMessages = messages.map(msg => this.buildForwardMessage(msg));
      
      // 调用API转发
      const response = await apiClient.request({
        url: '/api/v1/messages/forward',
        method: 'POST',
        data: {
          messages: forwardMessages,
          targetConversationId: targetConversationId,
          preserveFormat: this.interactionConfig.forward.preserveFormat,
          showSource: this.interactionConfig.forward.showForwardSource
        }
      });
      
      if (response.success) {
        return { success: true, data: response.data };
      } else {
        throw new Error(response.error || '转发失败');
      }
      
    } catch (error) {
      console.error('❌ 转发到会话失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 构建转发消息
  buildForwardMessage(originalMessage) {
    return {
      originalMessageId: originalMessage.messageId,
      content: originalMessage.content,
      msgType: originalMessage.msgType,
      originalSender: originalMessage.senderName,
      originalTimestamp: originalMessage.timestamp,
      forwardedAt: Date.now()
    };
  }

  // ⭐ ===== 消息收藏功能 =====

  // 收藏消息
  async favoriteMessage(messageId, userId) {
    try {
      console.log('⭐ 收藏消息:', messageId, userId);
      
      // 检查是否已收藏
      const isFavorited = await this.isMessageFavorited(messageId, userId);
      if (isFavorited) {
        return { success: false, error: '消息已收藏' };
      }
      
      // 调用API收藏
      const response = await apiClient.request({
        url: '/api/v1/messages/favorite',
        method: 'POST',
        data: {
          messageId: messageId,
          userId: userId
        }
      });
      
      if (response.success) {
        console.log('✅ 消息收藏成功');
        return { success: true, data: response.data };
      } else {
        throw new Error(response.error || '收藏失败');
      }
      
    } catch (error) {
      console.error('❌ 收藏消息失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 取消收藏消息
  async unfavoriteMessage(messageId, userId) {
    try {
      console.log('⭐ 取消收藏消息:', messageId, userId);
      
      // 调用API取消收藏
      const response = await apiClient.request({
        url: `/api/v1/messages/favorite/${messageId}`,
        method: 'DELETE',
        data: {
          userId: userId
        }
      });
      
      if (response.success) {
        console.log('✅ 取消收藏成功');
        return { success: true };
      } else {
        throw new Error(response.error || '取消收藏失败');
      }
      
    } catch (error) {
      console.error('❌ 取消收藏失败:', error);
      return { success: false, error: error.message };
    }
  }

  // 检查消息是否已收藏
  async isMessageFavorited(messageId, userId) {
    try {
      const response = await apiClient.request({
        url: `/api/v1/messages/favorite/check`,
        method: 'GET',
        data: {
          messageId: messageId,
          userId: userId
        }
      });
      
      return response.success && response.data.favorited;
    } catch (error) {
      console.error('❌ 检查收藏状态失败:', error);
      return false;
    }
  }

  // 📋 ===== 多选操作功能 =====

  // 进入多选模式
  enterMultiSelectMode(initialMessageId = null) {
    console.log('📋 进入多选模式');
    
    this.multiSelectMode = true;
    this.selectedMessages.clear();
    
    if (initialMessageId) {
      this.selectedMessages.add(initialMessageId);
    }
    
    this.currentOperation = {
      type: 'select',
      messageId: null,
      data: {
        selectedCount: this.selectedMessages.size
      }
    };
  }

  // 退出多选模式
  exitMultiSelectMode() {
    console.log('📋 退出多选模式');
    
    this.multiSelectMode = false;
    this.selectedMessages.clear();
    this.currentOperation = {
      type: null,
      messageId: null,
      data: null
    };
  }

  // 切换消息选择状态
  toggleMessageSelection(messageId) {
    if (this.selectedMessages.has(messageId)) {
      this.selectedMessages.delete(messageId);
    } else {
      this.selectedMessages.add(messageId);
    }
    
    this.currentOperation.data.selectedCount = this.selectedMessages.size;
    
    console.log('📋 消息选择状态切换:', messageId, this.selectedMessages.size);
  }

  // 获取选中的消息
  getSelectedMessages() {
    return Array.from(this.selectedMessages);
  }

  // 🔧 ===== 工具方法 =====

  // 获取消息信息
  async getMessageInfo(messageId) {
    try {
      const response = await apiClient.request({
        url: `/api/v1/messages/${messageId}`,
        method: 'GET'
      });
      
      return response.success ? response.data : null;
    } catch (error) {
      console.error('❌ 获取消息信息失败:', error);
      return null;
    }
  }

  // 获取多条消息信息
  async getMessagesInfo(messageIds) {
    try {
      const response = await apiClient.request({
        url: '/api/v1/messages/batch',
        method: 'POST',
        data: {
          messageIds: messageIds
        }
      });
      
      return response.success ? response.data : [];
    } catch (error) {
      console.error('❌ 获取消息信息失败:', error);
      return [];
    }
  }

  // 加载用户收藏
  async loadUserFavorites() {
    try {
      const favorites = wx.getStorageSync('userFavorites') || [];
      this.userFavorites = new Set(favorites);
    } catch (error) {
      console.error('❌ 加载用户收藏失败:', error);
    }
  }

  // 加载表情回应缓存
  async loadReactionsCache() {
    try {
      const cached = wx.getStorageSync('reactionsCache') || {};
      this.reactionsCache = new Map(Object.entries(cached));
    } catch (error) {
      console.error('❌ 加载表情回应缓存失败:', error);
    }
  }

  // 保存表情回应缓存
  saveReactionsCache() {
    try {
      const cacheObj = Object.fromEntries(this.reactionsCache);
      wx.setStorageSync('reactionsCache', cacheObj);
    } catch (error) {
      console.error('❌ 保存表情回应缓存失败:', error);
    }
  }

  // 获取当前操作状态
  getCurrentOperation() {
    return { ...this.currentOperation };
  }

  // 获取交互配置
  getInteractionConfig() {
    return { ...this.interactionConfig };
  }

  // 重置管理器
  reset() {
    this.exitMultiSelectMode();
    this.reactionsCache.clear();
    this.currentOperation = {
      type: null,
      messageId: null,
      data: null
    };
  }
}

// 创建全局实例
const messageInteractionManager = new MessageInteractionManager();

module.exports = messageInteractionManager;