import WebSocket from 'ws'
import { EventEmitter } from 'events'

/**
 * 行情数据类型
 */
export interface MarketData {
  symbol: string
  price: number
  volume: number
  change: number
  changePercent: number
  high: number
  low: number
  open: number
  close: number
  timestamp: number
  bid: number
  ask: number
  bidSize: number
  askSize: number
}

/**
 * 24小时行情数据
 */
export interface Ticker24hr {
  symbol: string
  priceChange: string
  priceChangePercent: string
  weightedAvgPrice: string
  prevClosePrice: string
  lastPrice: string
  lastQty: string
  bidPrice: string
  bidQty: string
  askPrice: string
  askQty: string
  openPrice: string
  highPrice: string
  lowPrice: string
  volume: string
  quoteVolume: string
  openTime: number
  closeTime: number
  firstId: number
  lastId: number
  count: number
}

/**
 * K线数据
 */
export interface KlineData {
  symbol: string
  interval: string
  openTime: number
  open: number
  high: number
  low: number
  close: number
  volume: number
  closeTime: number
  quoteVolume: number
  trades: number
  takerBuyBaseVolume: number
  takerBuyQuoteVolume: number
}

/**
 * 深度数据
 */
export interface DepthData {
  symbol: string
  bids: [string, string][] // [price, quantity]
  asks: [string, string][] // [price, quantity]
  lastUpdateId: number
}

/**
 * 行情数据管理器
 * 通过 WebSocket 实时更新内存中的行情信息
 */
export class MarketDataManager extends EventEmitter {
  private ws: WebSocket | null = null
  private reconnectTimer: NodeJS.Timeout | null = null
  private pingTimer: NodeJS.Timeout | null = null
  private pongTimer: NodeJS.Timeout | null = null

  // 内存中的行情数据
  private marketDataMap: Map<string, MarketData> = new Map()
  private ticker24hrMap: Map<string, Ticker24hr> = new Map()
  private klineDataMap: Map<string, Map<string, KlineData[]>> = new Map() // symbol -> interval -> klines
  private depthDataMap: Map<string, DepthData> = new Map()

  // 订阅的符号列表
  private subscribedSymbols: Set<string> = new Set()
  private subscribedIntervals: Set<string> = new Set()

  // 配置
  private wsUrl: string
  private reconnectInterval: number
  private maxReconnectAttempts: number
  private reconnectAttempts: number = 0
  private isConnected: boolean = false
  private isReconnecting: boolean = false

  constructor(
    wsUrl: string = 'wss://fstream.binance.com/ws',
    reconnectInterval: number = 5000,
    maxReconnectAttempts: number = 10,
  ) {
    super()
    this.wsUrl = wsUrl
    this.reconnectInterval = reconnectInterval
    this.maxReconnectAttempts = maxReconnectAttempts
  }

  /**
   * 连接 WebSocket
   */
  public connect(): Promise<void> {
    return new Promise((resolve, reject) => {
      if (this.isConnected || this.isReconnecting) {
        resolve()
        return
      }

      this.isReconnecting = true

      try {
        this.ws = new WebSocket(this.wsUrl)

        this.ws.on('open', () => {
          console.log('📡 WebSocket 连接成功')
          this.isConnected = true
          this.isReconnecting = false
          this.reconnectAttempts = 0
          this.startPingTimer()
          this.resubscribeAll()
          this.emit('connected')
          resolve()
        })

        this.ws.on('message', (data: WebSocket.Data) => {
          this.handleMessage(data)
        })

        this.ws.on('close', (code: number, reason: Buffer) => {
          console.log(`📡 WebSocket 连接关闭: ${code} - ${reason.toString()}`)
          this.isConnected = false
          this.stopPingTimer()
          this.emit('disconnected', code, reason.toString())
          this.scheduleReconnect()
        })

        this.ws.on('error', (error: Error) => {
          console.error('📡 WebSocket 错误:', error)
          this.emit('error', error)
          reject(error)
        })

        this.ws.on('pong', () => {
          this.handlePong()
        })
      } catch (error) {
        this.isReconnecting = false
        reject(error)
      }
    })
  }

  /**
   * 断开连接
   */
  public disconnect(): void {
    if (this.ws) {
      this.ws.close()
      this.ws = null
    }
    this.isConnected = false
    this.isReconnecting = false
    this.stopPingTimer()
    this.clearReconnectTimer()
  }

  /**
   * 订阅行情数据
   * @param symbols 交易对列表
   * @param intervals K线间隔列表（可选）
   */
  public subscribeMarketData(symbols: string[], intervals: string[] = []): void {
    const streams: string[] = []

    // 添加 24小时行情订阅
    symbols.forEach(symbol => {
      const streamName = `${symbol.toLowerCase()}@ticker`
      streams.push(streamName)
      this.subscribedSymbols.add(symbol)
    })

    // 添加 K线数据订阅
    intervals.forEach(interval => {
      symbols.forEach(symbol => {
        const streamName = `${symbol.toLowerCase()}@kline_${interval}`
        streams.push(streamName)
        this.subscribedIntervals.add(interval)
      })
    })

    // 添加深度数据订阅
    symbols.forEach(symbol => {
      const streamName = `${symbol.toLowerCase()}@depth20@100ms`
      streams.push(streamName)
    })

    if (streams.length > 0) {
      this.subscribe(streams)
    }
  }

  /**
   * 取消订阅
   * @param symbols 交易对列表
   */
  public unsubscribeMarketData(symbols: string[]): void {
    const streams: string[] = []

    symbols.forEach(symbol => {
      const tickerStream = `${symbol.toLowerCase()}@ticker`
      const depthStream = `${symbol.toLowerCase()}@depth20@100ms`
      streams.push(tickerStream, depthStream)

      this.subscribedSymbols.delete(symbol)
      this.marketDataMap.delete(symbol)
      this.ticker24hrMap.delete(symbol)
      this.depthDataMap.delete(symbol)
    })

    if (streams.length > 0) {
      this.unsubscribe(streams)
    }
  }

  /**
   * 获取行情数据
   * @param symbol 交易对
   */
  public getMarketData(symbol: string): MarketData | null {
    return this.marketDataMap.get(symbol) || null
  }

  /**
   * 获取所有行情数据
   */
  public getAllMarketData(): Map<string, MarketData> {
    return new Map(this.marketDataMap)
  }

  /**
   * 获取24小时行情数据
   * @param symbol 交易对
   */
  public getTicker24hr(symbol: string): Ticker24hr | null {
    return this.ticker24hrMap.get(symbol) || null
  }

  /**
   * 获取所有24小时行情数据
   */
  public getAllTicker24hr(): Map<string, Ticker24hr> {
    return new Map(this.ticker24hrMap)
  }

  /**
   * 获取K线数据
   * @param symbol 交易对
   * @param interval 时间间隔
   * @param limit 数量限制
   */
  public getKlineData(symbol: string, interval: string, limit: number = 100): KlineData[] {
    const symbolKlines = this.klineDataMap.get(symbol)
    if (!symbolKlines) return []

    const klines = symbolKlines.get(interval)
    if (!klines) return []

    return klines.slice(-limit)
  }

  /**
   * 获取深度数据
   * @param symbol 交易对
   */
  public getDepthData(symbol: string): DepthData | null {
    return this.depthDataMap.get(symbol) || null
  }

  /**
   * 获取订阅的符号列表
   */
  public getSubscribedSymbols(): string[] {
    return Array.from(this.subscribedSymbols)
  }

  /**
   * 检查是否已连接
   */
  public isConnectedToWebSocket(): boolean {
    return this.isConnected
  }

  /**
   * 处理 WebSocket 消息
   */
  private handleMessage(data: WebSocket.Data): void {
    try {
      const message = JSON.parse(data.toString())

      if (message.e === '24hrTicker') {
        this.handleTicker24hr(message)
      } else if (message.e === 'kline') {
        this.handleKlineData(message)
      } else if (message.e === 'depthUpdate') {
        this.handleDepthData(message)
      } else if (message.result === null && message.id) {
        // 订阅确认消息
        console.log('✅ 订阅成功:', message)
      } else if (message.pong) {
        // Pong 响应
        this.handlePong()
      }
    } catch (error) {
      console.error('❌ 解析 WebSocket 消息失败:', error)
    }
  }

  /**
   * 处理24小时行情数据
   */
  private handleTicker24hr(data: any): void {
    const symbol = data.s
    const tickerData: Ticker24hr = {
      symbol: data.s,
      priceChange: data.P,
      priceChangePercent: data.P,
      weightedAvgPrice: data.w,
      prevClosePrice: data.x,
      lastPrice: data.c,
      lastQty: data.Q,
      bidPrice: data.b,
      bidQty: data.B,
      askPrice: data.a,
      askQty: data.A,
      openPrice: data.o,
      highPrice: data.h,
      lowPrice: data.l,
      volume: data.v,
      quoteVolume: data.q,
      openTime: data.O,
      closeTime: data.C,
      firstId: data.F,
      lastId: data.L,
      count: data.n,
    }

    this.ticker24hrMap.set(symbol, tickerData)

    // 转换为 MarketData 格式
    const marketData: MarketData = {
      symbol: symbol,
      price: parseFloat(data.c),
      volume: parseFloat(data.v),
      change: parseFloat(data.P),
      changePercent: parseFloat(data.P),
      high: parseFloat(data.h),
      low: parseFloat(data.l),
      open: parseFloat(data.o),
      close: parseFloat(data.c),
      timestamp: data.E,
      bid: parseFloat(data.b),
      ask: parseFloat(data.a),
      bidSize: parseFloat(data.B),
      askSize: parseFloat(data.A),
    }

    this.marketDataMap.set(symbol, marketData)
    this.emit('ticker24hr', tickerData)
    this.emit('marketData', marketData)
  }

  /**
   * 处理K线数据
   */
  private handleKlineData(data: any): void {
    const symbol = data.s
    const interval = data.k.i
    const kline = data.k

    const klineData: KlineData = {
      symbol: symbol,
      interval: interval,
      openTime: kline.t,
      open: parseFloat(kline.o),
      high: parseFloat(kline.h),
      low: parseFloat(kline.l),
      close: parseFloat(kline.c),
      volume: parseFloat(kline.v),
      closeTime: kline.T,
      quoteVolume: parseFloat(kline.q),
      trades: kline.n,
      takerBuyBaseVolume: parseFloat(kline.V),
      takerBuyQuoteVolume: parseFloat(kline.Q),
    }

    // 初始化数据结构
    if (!this.klineDataMap.has(symbol)) {
      this.klineDataMap.set(symbol, new Map())
    }

    const symbolKlines = this.klineDataMap.get(symbol)!
    if (!symbolKlines.has(interval)) {
      symbolKlines.set(interval, [])
    }

    const klines = symbolKlines.get(interval)!

    // 更新或添加K线数据
    const existingIndex = klines.findIndex(k => k.openTime === klineData.openTime)
    if (existingIndex >= 0) {
      klines[existingIndex] = klineData
    } else {
      klines.push(klineData)
      // 保持最多1000条记录
      if (klines.length > 1000) {
        klines.splice(0, klines.length - 1000)
      }
    }

    this.emit('kline', klineData)
  }

  /**
   * 处理深度数据
   */
  private handleDepthData(data: any): void {
    const symbol = data.s

    const depthData: DepthData = {
      symbol: symbol,
      bids: data.b,
      asks: data.a,
      lastUpdateId: data.u,
    }

    this.depthDataMap.set(symbol, depthData)
    this.emit('depth', depthData)
  }

  /**
   * 发送订阅请求
   */
  private subscribe(streams: string[]): void {
    if (!this.ws || !this.isConnected) {
      console.warn('⚠️  WebSocket 未连接，无法订阅')
      return
    }

    const message = {
      method: 'SUBSCRIBE',
      params: streams,
      id: Date.now(),
    }

    this.ws.send(JSON.stringify(message))
    console.log('📡 订阅行情数据:', streams)
  }

  /**
   * 发送取消订阅请求
   */
  private unsubscribe(streams: string[]): void {
    if (!this.ws || !this.isConnected) {
      return
    }

    const message = {
      method: 'UNSUBSCRIBE',
      params: streams,
      id: Date.now(),
    }

    this.ws.send(JSON.stringify(message))
    console.log('📡 取消订阅:', streams)
  }

  /**
   * 重新订阅所有数据
   */
  private resubscribeAll(): void {
    if (this.subscribedSymbols.size > 0) {
      const symbols = Array.from(this.subscribedSymbols)
      const intervals = Array.from(this.subscribedIntervals)
      this.subscribeMarketData(symbols, intervals)
    }
  }

  /**
   * 启动 Ping 定时器
   */
  private startPingTimer(): void {
    this.pingTimer = setInterval(() => {
      if (this.ws && this.isConnected) {
        this.ws.ping()
        this.startPongTimer()
      }
    }, 30000) // 每30秒发送一次 ping
  }

  /**
   * 停止 Ping 定时器
   */
  private stopPingTimer(): void {
    if (this.pingTimer) {
      clearInterval(this.pingTimer)
      this.pingTimer = null
    }
  }

  /**
   * 启动 Pong 超时定时器
   */
  private startPongTimer(): void {
    this.pongTimer = setTimeout(() => {
      console.warn('⚠️  Pong 超时，重新连接 WebSocket')
      this.disconnect()
      this.scheduleReconnect()
    }, 10000) // 10秒超时
  }

  /**
   * 处理 Pong 响应
   */
  private handlePong(): void {
    if (this.pongTimer) {
      clearTimeout(this.pongTimer)
      this.pongTimer = null
    }
  }

  /**
   * 安排重连
   */
  private scheduleReconnect(): void {
    if (this.reconnectAttempts >= this.maxReconnectAttempts) {
      console.error('❌ 达到最大重连次数，停止重连')
      this.emit('maxReconnectAttemptsReached')
      return
    }

    this.clearReconnectTimer()
    this.reconnectTimer = setTimeout(() => {
      this.reconnectAttempts++
      console.log(`🔄 尝试重连 (${this.reconnectAttempts}/${this.maxReconnectAttempts})`)
      this.connect().catch(error => {
        console.error('❌ 重连失败:', error)
      })
    }, this.reconnectInterval)
  }

  /**
   * 清除重连定时器
   */
  private clearReconnectTimer(): void {
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer)
      this.reconnectTimer = null
    }
  }
}