/**
 * 分销模块WebSocket实时推送服务
 * 用于推送绑定过期提醒、提现状态更新等实时消息
 */

// 消息类型定义
export type WebSocketMessageType = 
  | 'binding_expiring'      // 绑定即将过期
  | 'binding_expired'       // 绑定已过期
  | 'binding_converted'     // 绑定已转化（用户付款）
  | 'withdrawal_approved'   // 提现已通过
  | 'withdrawal_completed'  // 提现已完成
  | 'withdrawal_rejected'   // 提现已拒绝
  | 'earnings_added'        // 收益增加
  | 'system_notice';        // 系统通知

// 消息结构
export interface WebSocketMessage {
  type: WebSocketMessageType;
  userId: string;           // 目标用户ID
  data: Record<string, unknown>;
  timestamp: string;
  messageId: string;
}

// 绑定过期提醒数据
export interface BindingExpiringData {
  bindingId: string;
  visitorNickname?: string;
  visitorPhone?: string;
  daysRemaining: number;
  expireTime: string;
}

// 提现状态更新数据
export interface WithdrawalUpdateData {
  withdrawalId: string;
  amount: number;
  status: string;
  paymentNo?: string;
  rejectReason?: string;
}

// 收益增加数据
export interface EarningsAddedData {
  orderId: string;
  orderAmount: number;
  commission: number;
  visitorNickname?: string;
}

/**
 * WebSocket消息队列（服务端存储待发送的消息）
 * 实际项目中应该使用Redis或其他消息队列
 */
const messageQueue: Map<string, WebSocketMessage[]> = new Map();

/**
 * 生成消息ID
 */
function generateMessageId(): string {
  return `msg_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}

/**
 * 添加消息到队列
 */
export function pushMessage(message: Omit<WebSocketMessage, 'messageId' | 'timestamp'>): void {
  const fullMessage: WebSocketMessage = {
    ...message,
    messageId: generateMessageId(),
    timestamp: new Date().toISOString(),
  };

  const userMessages = messageQueue.get(message.userId) || [];
  userMessages.push(fullMessage);
  
  // 保留最近100条消息
  if (userMessages.length > 100) {
    userMessages.shift();
  }
  
  messageQueue.set(message.userId, userMessages);
  
  console.log('[WebSocket] 消息已入队:', {
    type: fullMessage.type,
    userId: fullMessage.userId,
    messageId: fullMessage.messageId,
  });
}

/**
 * 获取用户待处理的消息
 */
export function getMessages(userId: string, since?: string): WebSocketMessage[] {
  const userMessages = messageQueue.get(userId) || [];
  
  if (since) {
    return userMessages.filter(m => m.timestamp > since);
  }
  
  return userMessages;
}

/**
 * 清除用户已读消息
 */
export function clearMessages(userId: string, messageIds: string[]): void {
  const userMessages = messageQueue.get(userId) || [];
  const filtered = userMessages.filter(m => !messageIds.includes(m.messageId));
  messageQueue.set(userId, filtered);
}

/**
 * 推送绑定即将过期提醒
 */
export function pushBindingExpiringReminder(params: {
  userId: string;
  bindingId: string;
  visitorNickname?: string;
  visitorPhone?: string;
  daysRemaining: number;
  expireTime: string;
}): void {
  pushMessage({
    type: 'binding_expiring',
    userId: params.userId,
    data: {
      bindingId: params.bindingId,
      visitorNickname: params.visitorNickname,
      visitorPhone: params.visitorPhone,
      daysRemaining: params.daysRemaining,
      expireTime: params.expireTime,
      message: `用户 ${params.visitorNickname || params.visitorPhone || '未知'} 的绑定将在 ${params.daysRemaining} 天后过期`,
    },
  });
}

/**
 * 推送绑定已过期通知
 */
export function pushBindingExpiredNotice(params: {
  userId: string;
  bindingId: string;
  visitorNickname?: string;
  visitorPhone?: string;
}): void {
  pushMessage({
    type: 'binding_expired',
    userId: params.userId,
    data: {
      bindingId: params.bindingId,
      visitorNickname: params.visitorNickname,
      visitorPhone: params.visitorPhone,
      message: `用户 ${params.visitorNickname || params.visitorPhone || '未知'} 的绑定已过期`,
    },
  });
}

/**
 * 推送绑定转化通知（用户付款）
 */
export function pushBindingConvertedNotice(params: {
  userId: string;
  bindingId: string;
  orderId: string;
  orderAmount: number;
  commission: number;
  visitorNickname?: string;
}): void {
  pushMessage({
    type: 'binding_converted',
    userId: params.userId,
    data: {
      bindingId: params.bindingId,
      orderId: params.orderId,
      orderAmount: params.orderAmount,
      commission: params.commission,
      visitorNickname: params.visitorNickname,
      message: `恭喜！用户 ${params.visitorNickname || '未知'} 已付款 ¥${params.orderAmount}，您获得佣金 ¥${params.commission.toFixed(2)}`,
    },
  });
}

/**
 * 推送提现状态更新
 */
export function pushWithdrawalUpdate(params: {
  userId: string;
  withdrawalId: string;
  amount: number;
  status: 'approved' | 'completed' | 'rejected';
  paymentNo?: string;
  rejectReason?: string;
}): void {
  const type: WebSocketMessageType = 
    params.status === 'approved' ? 'withdrawal_approved' :
    params.status === 'completed' ? 'withdrawal_completed' : 'withdrawal_rejected';
  
  const messages: Record<string, string> = {
    approved: `您的提现申请 ¥${params.amount.toFixed(2)} 已通过审核，正在打款中...`,
    completed: `您的提现 ¥${params.amount.toFixed(2)} 已成功到账，流水号: ${params.paymentNo}`,
    rejected: `您的提现申请 ¥${params.amount.toFixed(2)} 已被拒绝，原因: ${params.rejectReason || '未说明'}`,
  };

  pushMessage({
    type,
    userId: params.userId,
    data: {
      withdrawalId: params.withdrawalId,
      amount: params.amount,
      status: params.status,
      paymentNo: params.paymentNo,
      rejectReason: params.rejectReason,
      message: messages[params.status],
    },
  });
}

/**
 * 推送收益增加通知
 */
export function pushEarningsAdded(params: {
  userId: string;
  orderId: string;
  orderAmount: number;
  commission: number;
  visitorNickname?: string;
}): void {
  pushMessage({
    type: 'earnings_added',
    userId: params.userId,
    data: {
      orderId: params.orderId,
      orderAmount: params.orderAmount,
      commission: params.commission,
      visitorNickname: params.visitorNickname,
      message: `收益 +¥${params.commission.toFixed(2)}`,
    },
  });
}

/**
 * 推送系统通知
 */
export function pushSystemNotice(params: {
  userId: string;
  title: string;
  content: string;
  link?: string;
}): void {
  pushMessage({
    type: 'system_notice',
    userId: params.userId,
    data: {
      title: params.title,
      content: params.content,
      link: params.link,
    },
  });
}

/**
 * 客户端WebSocket Hook（用于React组件）
 * 使用轮询模式获取实时消息
 */
export function createWebSocketClient(userId: string, onMessage: (message: WebSocketMessage) => void) {
  let lastTimestamp = new Date().toISOString();
  let isRunning = false;
  let intervalId: NodeJS.Timeout | null = null;

  const fetchMessages = async () => {
    if (!isRunning) return;
    
    try {
      const response = await fetch(`/api/distribution/messages?userId=${userId}&since=${encodeURIComponent(lastTimestamp)}`);
      if (!response.ok) return;
      
      const data = await response.json();
      if (data.success && data.messages?.length > 0) {
        for (const message of data.messages) {
          onMessage(message);
          if (message.timestamp > lastTimestamp) {
            lastTimestamp = message.timestamp;
          }
        }
      }
    } catch (error) {
      console.error('[WebSocketClient] 获取消息失败:', error);
    }
  };

  return {
    connect: () => {
      isRunning = true;
      // 每3秒轮询一次
      intervalId = setInterval(fetchMessages, 3000);
      // 立即获取一次
      fetchMessages();
      console.log('[WebSocketClient] 已连接，用户:', userId);
    },
    
    disconnect: () => {
      isRunning = false;
      if (intervalId) {
        clearInterval(intervalId);
        intervalId = null;
      }
      console.log('[WebSocketClient] 已断开连接');
    },
    
    isConnected: () => isRunning,
  };
}