import { EventEmitter } from 'events'
import { logger } from '../../utils/logger.js'
import { PacificaProxyClient } from '../../exchanges/pacifica/PacificaProxyClient.js'
import { OrderCreatePayload } from '../../exchanges/pacifica/OrdersAdapter.js'

/**
 * 止盈止损管理器 - 高级止损策略管理
 */
export class StopLossManager extends EventEmitter {
  private stopOrders: Map<string, StopOrder> = new Map()
  private clients: Map<string, PacificaProxyClient> = new Map()
  private config: StopLossConfig
  private isActive: boolean = false
  private monitoringInterval?: NodeJS.Timeout

  constructor(config?: Partial<StopLossConfig>) {
    super()
    this.config = {
      checkIntervalMs: config?.checkIntervalMs || 2000, // 2秒检查间隔
      defaultStopLossPercent: config?.defaultStopLossPercent || 0.01, // 1% 止损
      defaultTakeProfitPercent: config?.defaultTakeProfitPercent || 0.02, // 2% 止盈
      trailingStopPercent: config?.trailingStopPercent || 0.005, // 0.5% 追踪止损
      partialClosePercent: config?.partialClosePercent || 0.5, // 50% 部分平仓
      enableBreakEvenStop: config?.enableBreakEvenStop || true, // 启用盈亏平衡止损
      breakEvenTriggerPercent: config?.breakEvenTriggerPercent || 0.01, // 1% 触发盈亏平衡
      enableScaleOut: config?.enableScaleOut || true, // 启用分批止盈
      scaleOutLevels: config?.scaleOutLevels || [0.01, 0.02, 0.03], // 分批止盈点位
      maxSlippagePercent: config?.maxSlippagePercent || 0.01, // 最大滑点
    }
  }

  /**
   * 注册交易客户端
   */
  registerClient(account: string, client: PacificaProxyClient): void {
    this.clients.set(account, client)
    logger.info('注册止损管理客户端', { account })
  }

  /**
   * 为仓位设置止盈止损
   */
  async setStopLossAndTakeProfit(
    account: string,
    symbol: string,
    positionSize: number,
    entryPrice: number,
    isLong: boolean,
    customConfig?: Partial<StopOrderConfig>,
  ): Promise<string> {
    const orderId = this.generateOrderId(account, symbol)

    const stopOrder: StopOrder = {
      id: orderId,
      account,
      symbol,
      originalSize: Math.abs(positionSize),
      remainingSize: Math.abs(positionSize),
      entryPrice,
      isLong,
      status: 'active',
      createdAt: Date.now(),
      lastUpdate: Date.now(),
      config: {
        stopLossPercent: customConfig?.stopLossPercent || this.config.defaultStopLossPercent,
        takeProfitPercent: customConfig?.takeProfitPercent || this.config.defaultTakeProfitPercent,
        enableTrailingStop: customConfig?.enableTrailingStop || false,
        trailingStopPercent: customConfig?.trailingStopPercent || this.config.trailingStopPercent,
        enablePartialClose: customConfig?.enablePartialClose || false,
        partialClosePercent: customConfig?.partialClosePercent || this.config.partialClosePercent,
        stopType: customConfig?.stopType || 'fixed',
      },
      trailingStopPrice: null,
      highestPrice: entryPrice,
      lowestPrice: entryPrice,
      executedOrders: [],
      partialCloseCount: 0,
    }

    // 计算初始止损止盈价格
    this.updateStopPrices(stopOrder, entryPrice)

    this.stopOrders.set(orderId, stopOrder)

    logger.info('设置止盈止损', {
      orderId,
      account,
      symbol,
      positionSize,
      entryPrice,
      isLong,
      stopLossPrice: stopOrder.stopLossPrice,
      takeProfitPrice: stopOrder.takeProfitPrice,
    })

    this.emit('stopOrderCreated', stopOrder)
    return orderId
  }

  /**
   * 启动止损监控
   */
  startMonitoring(): void {
    if (this.isActive) return

    this.isActive = true

    this.monitoringInterval = setInterval(() => {
      this.performStopChecks()
    }, this.config.checkIntervalMs)

    logger.info('止损监控已启动', {
      interval: this.config.checkIntervalMs,
      activeOrders: this.stopOrders.size,
    })

    this.emit('monitoringStarted')
  }

  /**
   * 停止止损监控
   */
  stopMonitoring(): void {
    if (!this.isActive) return

    this.isActive = false

    if (this.monitoringInterval) {
      clearInterval(this.monitoringInterval)
      this.monitoringInterval = undefined
    }

    logger.info('止损监控已停止')
    this.emit('monitoringStopped')
  }

  /**
   * 执行止损检查
   */
  private async performStopChecks(): Promise<void> {
    const activeOrders = Array.from(this.stopOrders.values()).filter(order => order.status === 'active')

    for (const order of activeOrders) {
      try {
        await this.checkStopOrder(order)
      } catch (error: any) {
        logger.error('止损检查失败', {
          orderId: order.id,
          account: order.account,
          symbol: order.symbol,
          error: error.message,
        })
      }
    }
  }

  /**
   * 检查单个止损订单
   */
  private async checkStopOrder(order: StopOrder): Promise<void> {
    const client = this.clients.get(order.account)
    if (!client) {
      logger.warn('未找到交易客户端', { account: order.account })
      return
    }

    // 获取当前价格
    const currentPrice = await this.getCurrentPrice(client, order.symbol)
    if (!currentPrice) return

    // 更新价格追踪
    this.updatePriceTracking(order, currentPrice)

    // 检查是否触发止损或止盈
    const triggerResult = this.checkTriggers(order, currentPrice)

    if (triggerResult.shouldTrigger) {
      await this.executeTrigger(order, triggerResult, currentPrice)
    }

    order.lastUpdate = Date.now()
  }

  /**
   * 更新价格追踪
   */
  private updatePriceTracking(order: StopOrder, currentPrice: number): void {
    // 更新最高价和最低价
    if (currentPrice > order.highestPrice) {
      order.highestPrice = currentPrice
    }
    if (currentPrice < order.lowestPrice) {
      order.lowestPrice = currentPrice
    }

    // 更新追踪止损价格
    if (order.config.enableTrailingStop) {
      this.updateTrailingStop(order, currentPrice)
    }

    // 更新盈亏平衡止损
    if (this.config.enableBreakEvenStop) {
      this.updateBreakEvenStop(order, currentPrice)
    }

    // 更新止损止盈价格
    this.updateStopPrices(order, currentPrice)
  }

  /**
   * 更新追踪止损
   */
  private updateTrailingStop(order: StopOrder, currentPrice: number): void {
    if (!order.config.enableTrailingStop) return

    const trailingPercent = order.config.trailingStopPercent || this.config.trailingStopPercent

    if (order.isLong) {
      // 多头：追踪止损价格跟随最高价下移
      const newTrailingStop = order.highestPrice * (1 - trailingPercent)
      if (!order.trailingStopPrice || newTrailingStop > order.trailingStopPrice) {
        order.trailingStopPrice = newTrailingStop
        logger.debug('更新追踪止损', {
          orderId: order.id,
          newTrailingStop,
          highestPrice: order.highestPrice,
          currentPrice,
        })
      }
    } else {
      // 空头：追踪止损价格跟随最低价上移
      const newTrailingStop = order.lowestPrice * (1 + trailingPercent)
      if (!order.trailingStopPrice || newTrailingStop < order.trailingStopPrice) {
        order.trailingStopPrice = newTrailingStop
        logger.debug('更新追踪止损', {
          orderId: order.id,
          newTrailingStop,
          lowestPrice: order.lowestPrice,
          currentPrice,
        })
      }
    }
  }

  /**
   * 更新盈亏平衡止损
   */
  private updateBreakEvenStop(order: StopOrder, currentPrice: number): void {
    const triggerPercent = this.config.breakEvenTriggerPercent

    const profitPercent = order.isLong
      ? (currentPrice - order.entryPrice) / order.entryPrice
      : (order.entryPrice - currentPrice) / order.entryPrice

    // 如果盈利超过触发阈值，将止损移动到盈亏平衡点
    if (profitPercent >= triggerPercent && order.config.stopType === 'fixed') {
      order.config.stopType = 'break_even'
      logger.info('激活盈亏平衡止损', {
        orderId: order.id,
        profitPercent: profitPercent.toFixed(4),
        entryPrice: order.entryPrice,
        currentPrice,
      })
    }
  }

  /**
   * 更新止损止盈价格
   */
  private updateStopPrices(order: StopOrder, referencePrice?: number): void {
    const price = referencePrice || order.entryPrice

    if (order.config.stopType === 'break_even') {
      // 盈亏平衡止损
      order.stopLossPrice = order.entryPrice
    } else if (order.config.enableTrailingStop && order.trailingStopPrice) {
      // 追踪止损
      order.stopLossPrice = order.trailingStopPrice
    } else {
      // 固定止损
      const stopLossPercent = order.config.stopLossPercent
      order.stopLossPrice = order.isLong
        ? order.entryPrice * (1 - stopLossPercent)
        : order.entryPrice * (1 + stopLossPercent)
    }

    // 止盈价格
    const takeProfitPercent = order.config.takeProfitPercent
    order.takeProfitPrice = order.isLong
      ? order.entryPrice * (1 + takeProfitPercent)
      : order.entryPrice * (1 - takeProfitPercent)
  }

  /**
   * 检查触发条件
   */
  private checkTriggers(order: StopOrder, currentPrice: number): TriggerResult {
    // 检查止损
    if (order.stopLossPrice) {
      const stopLossTriggered = order.isLong ? currentPrice <= order.stopLossPrice : currentPrice >= order.stopLossPrice

      if (stopLossTriggered) {
        return {
          shouldTrigger: true,
          triggerType: 'stop_loss',
          triggerPrice: order.stopLossPrice,
          closePercent: 1.0, // 全部平仓
        }
      }
    }

    // 检查止盈
    if (order.takeProfitPrice) {
      const takeProfitTriggered = order.isLong
        ? currentPrice >= order.takeProfitPrice
        : currentPrice <= order.takeProfitPrice

      if (takeProfitTriggered) {
        const closePercent = order.config.enablePartialClose
          ? order.config.partialClosePercent || this.config.partialClosePercent
          : 1.0

        return {
          shouldTrigger: true,
          triggerType: 'take_profit',
          triggerPrice: order.takeProfitPrice,
          closePercent,
        }
      }
    }

    // 检查分批止盈
    if (this.config.enableScaleOut) {
      const scaleOutTrigger = this.checkScaleOutTriggers(order, currentPrice)
      if (scaleOutTrigger.shouldTrigger) {
        return scaleOutTrigger
      }
    }

    return { shouldTrigger: false }
  }

  /**
   * 检查分批止盈触发
   */
  private checkScaleOutTriggers(order: StopOrder, currentPrice: number): TriggerResult {
    const scaleOutLevels = this.config.scaleOutLevels

    for (let i = 0; i < scaleOutLevels.length; i++) {
      const level = scaleOutLevels[i]
      const targetPrice = order.isLong ? order.entryPrice * (1 + level) : order.entryPrice * (1 - level)

      const triggered = order.isLong ? currentPrice >= targetPrice : currentPrice <= targetPrice

      if (triggered && !order.scaleOutExecuted?.includes(i)) {
        if (!order.scaleOutExecuted) {
          order.scaleOutExecuted = []
        }

        return {
          shouldTrigger: true,
          triggerType: 'scale_out',
          triggerPrice: targetPrice,
          closePercent: 0.25, // 25% 分批平仓
          scaleOutLevel: i,
        }
      }
    }

    return { shouldTrigger: false }
  }

  /**
   * 执行触发操作
   */
  private async executeTrigger(order: StopOrder, trigger: TriggerResult, currentPrice: number): Promise<void> {
    const client = this.clients.get(order.account)
    if (!client) return

    const closeSize = order.remainingSize * trigger.closePercent
    const side = order.isLong ? 'ask' : 'bid' // 平仓方向

    try {
      const payload: OrderCreatePayload = {
        account: order.account,
        symbol: order.symbol,
        amount: closeSize.toString(),
        side,
        reduceOnly: true,
        slippagePercent: (this.config.maxSlippagePercent * 100).toString(),
      }

      let result
      if (trigger.triggerType === 'stop_loss') {
        // 止损使用市价单确保成交
        result = await client.createMarketOrder(payload)
      } else {
        // 止盈可以使用限价单获得更好价格
        payload.orderType = 'limit'
        payload.price = trigger.triggerPrice?.toString()
        result = await client.createLimitOrder(payload)
      }

      // 记录执行结果
      const execution: StopExecution = {
        orderId: result.orderId || result.order_id || '',
        triggerType: trigger.triggerType,
        executedSize: closeSize,
        executedPrice: currentPrice,
        timestamp: Date.now(),
        scaleOutLevel: trigger.scaleOutLevel,
      }

      order.executedOrders.push(execution)
      order.remainingSize -= closeSize

      // 更新分批执行状态
      if (trigger.triggerType === 'scale_out' && trigger.scaleOutLevel !== undefined) {
        if (!order.scaleOutExecuted) {
          order.scaleOutExecuted = []
        }
        order.scaleOutExecuted.push(trigger.scaleOutLevel)
        order.partialCloseCount++
      }

      // 检查是否完全平仓
      if (order.remainingSize <= 0.0001) {
        order.status = 'completed'
      } else if (trigger.triggerType === 'take_profit' && order.config.enablePartialClose) {
        // 部分止盈后，调整剩余止盈价格
        this.adjustRemainingTakeProfit(order)
      }

      logger.info('触发执行成功', {
        orderId: order.id,
        triggerType: trigger.triggerType,
        executedSize: closeSize,
        remainingSize: order.remainingSize,
        executedPrice: currentPrice,
        resultOrderId: result.orderId || result.order_id,
      })

      this.emit('stopTriggered', {
        order,
        execution,
        trigger,
        currentPrice,
      })
    } catch (error: any) {
      logger.error('触发执行失败', {
        orderId: order.id,
        triggerType: trigger.triggerType,
        error: error.message,
      })

      this.emit('stopTriggerFailed', {
        order,
        trigger,
        error: error.message,
      })
    }
  }

  /**
   * 调整剩余止盈价格
   */
  private adjustRemainingTakeProfit(order: StopOrder): void {
    // 部分止盈后，可以将剩余仓位的止盈点位适当调高
    const adjustmentFactor = 1.5 // 调高50%
    const originalPercent = order.config.takeProfitPercent
    const newPercent = originalPercent * adjustmentFactor

    order.takeProfitPrice = order.isLong ? order.entryPrice * (1 + newPercent) : order.entryPrice * (1 - newPercent)

    logger.info('调整剩余止盈价格', {
      orderId: order.id,
      newTakeProfitPrice: order.takeProfitPrice,
      adjustmentFactor,
    })
  }

  /**
   * 获取当前价格
   */
  private async getCurrentPrice(client: PacificaProxyClient, symbol: string): Promise<number | null> {
    try {
      const ticker = await client.getTicker(symbol)
      return ticker?.price || null
    } catch (error: any) {
      logger.error('获取当前价格失败', {
        symbol,
        error: error.message,
      })
      return null
    }
  }

  /**
   * 生成订单ID
   */
  private generateOrderId(account: string, symbol: string): string {
    return `stop_${account}_${symbol}_${Date.now()}_${Math.random().toString(36).substr(2, 6)}`
  }

  /**
   * 取消止损订单
   */
  cancelStopOrder(orderId: string): boolean {
    const order = this.stopOrders.get(orderId)
    if (!order) return false

    order.status = 'cancelled'
    logger.info('取消止损订单', { orderId })
    this.emit('stopOrderCancelled', order)
    return true
  }

  /**
   * 获取活跃止损订单
   */
  getActiveStopOrders(account?: string): StopOrder[] {
    const orders = Array.from(this.stopOrders.values()).filter(order => order.status === 'active')
    return account ? orders.filter(order => order.account === account) : orders
  }

  /**
   * 获取止损统计
   */
  getStopOrderStats(): StopOrderStats {
    const allOrders = Array.from(this.stopOrders.values())

    return {
      totalOrders: allOrders.length,
      activeOrders: allOrders.filter(o => o.status === 'active').length,
      completedOrders: allOrders.filter(o => o.status === 'completed').length,
      cancelledOrders: allOrders.filter(o => o.status === 'cancelled').length,
      totalExecutions: allOrders.reduce((sum, o) => sum + o.executedOrders.length, 0),
      successfulStopLosses: allOrders.filter(o => o.executedOrders.some(e => e.triggerType === 'stop_loss')).length,
      successfulTakeProfits: allOrders.filter(o => o.executedOrders.some(e => e.triggerType === 'take_profit')).length,
    }
  }
}

// 类型定义
export interface StopOrder {
  id: string
  account: string
  symbol: string
  originalSize: number
  remainingSize: number
  entryPrice: number
  isLong: boolean
  status: 'active' | 'completed' | 'cancelled'
  createdAt: number
  lastUpdate: number
  config: StopOrderConfig
  stopLossPrice?: number
  takeProfitPrice?: number
  trailingStopPrice?: number | null
  highestPrice: number
  lowestPrice: number
  executedOrders: StopExecution[]
  partialCloseCount: number
  scaleOutExecuted?: number[]
}

export interface StopOrderConfig {
  stopLossPercent: number
  takeProfitPercent: number
  enableTrailingStop: boolean
  trailingStopPercent: number
  enablePartialClose: boolean
  partialClosePercent: number
  stopType: 'fixed' | 'trailing' | 'break_even'
}

export interface StopLossConfig {
  checkIntervalMs: number
  defaultStopLossPercent: number
  defaultTakeProfitPercent: number
  trailingStopPercent: number
  partialClosePercent: number
  enableBreakEvenStop: boolean
  breakEvenTriggerPercent: number
  enableScaleOut: boolean
  scaleOutLevels: number[]
  maxSlippagePercent: number
}

export interface TriggerResult {
  shouldTrigger: boolean
  triggerType?: 'stop_loss' | 'take_profit' | 'scale_out'
  triggerPrice?: number
  closePercent?: number
  scaleOutLevel?: number
}

export interface StopExecution {
  orderId: string
  triggerType: 'stop_loss' | 'take_profit' | 'scale_out'
  executedSize: number
  executedPrice: number
  timestamp: number
  scaleOutLevel?: number
}

export interface StopOrderStats {
  totalOrders: number
  activeOrders: number
  completedOrders: number
  cancelledOrders: number
  totalExecutions: number
  successfulStopLosses: number
  successfulTakeProfits: number
}

export const stopLossManager = new StopLossManager()