/**
 * T031 演示：市场数据失效回退桥接服务
 * 演示如何集成现有的 PacificaOrderbookManager 与新的 MarketDataFailoverService
 */
import { logger } from '../src/utils/logger.js'

// 模拟现有的 PacificaOrderbookManager
class MockPacificaOrderbookManager {
  private isRunning = false
  private orderbookStats: any[] = []

  async initialize(): Promise<void> {
    logger.info('模拟 PacificaOrderbookManager 初始化')
  }

  async start(): Promise<void> {
    logger.info('模拟 PacificaOrderbookManager 启动')
    this.isRunning = true
  }

  async stop(): Promise<void> {
    logger.info('模拟 PacificaOrderbookManager 停止')
    this.isRunning = false
  }

  getStatus(): any {
    return {
      name: 'PacificaOrderbookManager',
      status: this.isRunning ? 'running' : 'stopped',
      lastUpdate: Date.now(),
      details: {
        isConnected: this.isRunning,
        cachedSymbols: ['BTC', 'ETH', 'SOL'],
        totalCacheSize: 3
      }
    }
  }

  getOrderbookStats(): any[] {
    // 模拟返回订单簿统计数据
    const now = Date.now()
    return [
      {
        symbol: 'BTC',
        spread: 100,
        spreadPercent: 0.001,
        midPrice: 108000,
        bestBid: 107950,
        bestAsk: 108050,
        totalBidSize: 1.5,
        totalAskSize: 1.2,
        depthLevels: 10,
        updateFrequency: 2.0,
        lastUpdate: now - 5000 // 5秒前更新
      },
      {
        symbol: 'ETH',
        spread: 20,
        spreadPercent: 0.002,
        midPrice: 3200,
        bestBid: 3190,
        bestAsk: 3210,
        totalBidSize: 10.0,
        totalAskSize: 8.5,
        depthLevels: 8,
        updateFrequency: 1.8,
        lastUpdate: now - 3000 // 3秒前更新
      }
    ]
  }

  // 模拟触发错误事件
  triggerError(error: Error): void {
    logger.warn('模拟订单簿管理器错误')
    this.emit('error', error)
  }

  // 添加事件发射器功能
  private listeners = new Map<string, Function[]>()

  on(event: string, listener: Function): void {
    if (!this.listeners.has(event)) {
      this.listeners.set(event, [])
    }
    this.listeners.get(event)!.push(listener)
  }

  emit(event: string, ...args: any[]): void {
    const eventListeners = this.listeners.get(event)
    if (eventListeners) {
      eventListeners.forEach(listener => listener(...args))
    }
  }
}

// 模拟 MarketDataFailoverService
class MockMarketDataFailoverService {
  async triggerFailover(request: any): Promise<any> {
    logger.info(`触发失效回退: ${request.triggerReason}`)
    
    // 模拟失效回退过程
    await new Promise(resolve => setTimeout(resolve, 200))
    
    return {
      success: true,
      newDataSource: 'backup',
      failoverDuration: 200,
      originalDataSource: 'primary',
      triggerReason: request.triggerReason
    }
  }

  getFailoverStats(): any {
    return {
      totalFailovers: 5,
      successfulFailovers: 4,
      failedFailovers: 1,
      averageFailoverTime: 150,
      lastFailoverTime: Date.now() - 30000
    }
  }
}

// 模拟其他管理器
class MockMarketDataFeedManager {
  private feeds = new Map<string, any>()

  addFeed(feed: any): void {
    this.feeds.set(feed.feedId, feed)
    logger.info(`添加市场数据源: ${feed.feedId}`)
  }

  getAllFeeds(): any[] {
    return Array.from(this.feeds.values())
  }
}

class MockSynthPriceSnapshotManager {
  private snapshots = new Map<string, any>()

  addSnapshot(snapshot: any): void {
    this.snapshots.set(snapshot.snapshotId, snapshot)
    logger.info(`添加合成价格快照: ${snapshot.symbol}`)
  }

  getAllSnapshots(): any[] {
    return Array.from(this.snapshots.values())
  }
}

class MockMonitoringEventManager {
  private events: any[] = []

  addEvent(event: any): void {
    this.events.push(event)
    logger.info(`添加监控事件: ${event.type}`)
  }

  getAllEvents(): any[] {
    return this.events
  }
}

// 简化的市场数据失效回退桥接器实现
class SimpleMarketDataFailoverBridge {
  private isRunning = false
  private healthCheckInterval?: NodeJS.Timeout
  private currentDataSource: 'primary' | 'backup' | 'synthetic' = 'primary'
  private failoverStats = {
    totalFailovers: 0,
    successfulFailovers: 0,
    failedFailovers: 0,
    lastFailoverTime: 0,
    lastError: null as string | null
  }

  constructor(
    private pacificaOrderbookManager: MockPacificaOrderbookManager,
    private marketDataFailoverService: MockMarketDataFailoverService,
    private marketDataFeedManager: MockMarketDataFeedManager,
    private synthPriceSnapshotManager: MockSynthPriceSnapshotManager,
    private monitoringManager: MockMonitoringEventManager
  ) {}

  async start(): Promise<void> {
    logger.info('启动简化市场数据失效回退桥接器')
    
    try {
      await this.initializeMarketDataFeeds()
      this.startHealthCheck()
      this.setupFailoverMonitoring()
      this.isRunning = true
      logger.info('简化市场数据失效回退桥接器启动成功')
    } catch (error: any) {
      logger.error(`启动失败: ${error.message}`)
      throw error
    }
  }

  async stop(): Promise<void> {
    logger.info('停止简化市场数据失效回退桥接器')
    if (this.healthCheckInterval) {
      clearInterval(this.healthCheckInterval)
    }
    this.isRunning = false
  }

  private async initializeMarketDataFeeds(): Promise<void> {
    logger.info('初始化市场数据源')

    // 创建主要数据源
    const primaryFeed = {
      feedId: 'pacifica-ws-primary',
      exchange: 'pacifica',
      symbol: 'BTC',
      type: 'websocket',
      wsEndpoint: 'wss://ws.pacifica.fi/ws',
      httpEndpoint: 'https://api.pacifica.fi/api/v1',
      status: 'active',
      priority: 1,
      latency: 50,
      reliability: 0.95,
      lastUpdate: new Date(),
      createdAt: new Date(),
      updatedAt: new Date()
    }

    this.marketDataFeedManager.addFeed(primaryFeed)

    // 创建备用数据源
    const backupFeed = {
      feedId: 'pacifica-http-backup',
      exchange: 'pacifica',
      symbol: 'BTC',
      type: 'http',
      wsEndpoint: '',
      httpEndpoint: 'https://api.pacifica.fi/api/v1',
      status: 'standby',
      priority: 2,
      latency: 200,
      reliability: 0.90,
      lastUpdate: new Date(),
      createdAt: new Date(),
      updatedAt: new Date()
    }

    this.marketDataFeedManager.addFeed(backupFeed)

    // 初始化合成价格快照
    await this.initializeSynthPriceSnapshots()

    logger.info('市场数据源初始化完成')
  }

  private async initializeSynthPriceSnapshots(): Promise<void> {
    logger.info('初始化合成价格快照')

    const symbols = ['BTC', 'ETH', 'SOL']
    
    for (const symbol of symbols) {
      const synthSnapshot = {
        snapshotId: `synth-${symbol.toLowerCase()}-${Date.now()}`,
        symbol,
        source: 'synthetic',
        price: this.generateSyntheticPrice(symbol),
        confidence: 0.8,
        factors: {
          historicalAverage: this.getHistoricalAverage(symbol),
          volatility: this.getVolatility(symbol),
          marketTrend: this.getMarketTrend(symbol)
        },
        createdAt: new Date(),
        updatedAt: new Date()
      }

      this.synthPriceSnapshotManager.addSnapshot(synthSnapshot)
    }

    logger.info('合成价格快照初始化完成')
  }

  private startHealthCheck(): void {
    logger.info('启动市场数据健康检查')
    
    this.healthCheckInterval = setInterval(async () => {
      try {
        await this.performHealthCheck()
      } catch (error: any) {
        logger.error(`健康检查失败: ${error.message}`)
      }
    }, 5000) // 5秒检查一次

    // 立即执行一次健康检查
    this.performHealthCheck().catch(error => {
      logger.error(`初始健康检查失败: ${error.message}`)
    })
  }

  private async performHealthCheck(): Promise<void> {
    if (!this.isRunning) return

    logger.debug('执行市场数据健康检查')

    try {
      const primaryFeedStatus = this.pacificaOrderbookManager.getStatus()
      
      if (primaryFeedStatus.status !== 'running') {
        logger.warn('主要数据源状态异常，检查是否需要失效回退')
        await this.checkFailoverNeeded('primary_feed_unhealthy')
      }

      const dataQuality = this.assessDataQuality()
      
      if (dataQuality === 'poor') {
        logger.warn('数据质量较差，触发失效回退')
        await this.triggerFailover('data_quality_poor')
      }

      // 添加监控事件
      this.monitoringManager.addEvent({
        eventId: `health-check-${Date.now()}`,
        type: 'market-data-health-check',
        payload: {
          primaryFeedStatus: primaryFeedStatus.status,
          dataQuality,
          currentDataSource: this.currentDataSource,
          failoverStats: this.failoverStats
        },
        severity: dataQuality === 'poor' ? 'WARN' : 'INFO',
        createdAt: new Date()
      })

    } catch (error: any) {
      logger.error(`健康检查执行失败: ${error.message}`)
    }
  }

  private async checkFailoverNeeded(reason: string): Promise<void> {
    try {
      const failoverResult = await this.marketDataFailoverService.triggerFailover({
        triggerReason: reason,
        timeoutMs: 10000,
        maxAttempts: 3
      })

      if (failoverResult.success) {
        this.currentDataSource = failoverResult.newDataSource as any
        this.failoverStats.successfulFailovers++
        this.failoverStats.lastFailoverTime = Date.now()
        logger.info(`失效回退成功，切换到: ${this.currentDataSource}`)
      } else {
        this.failoverStats.failedFailovers++
        this.failoverStats.lastError = failoverResult.error
        logger.error(`失效回退失败: ${failoverResult.error}`)
      }

      this.failoverStats.totalFailovers++
    } catch (error: any) {
      this.failoverStats.failedFailovers++
      this.failoverStats.lastError = error.message
      logger.error(`检查失效回退需求失败: ${error.message}`)
    }
  }

  async triggerFailover(reason: string): Promise<{
    success: boolean
    message: string
    newDataSource?: string
  }> {
    try {
      const failoverResult = await this.marketDataFailoverService.triggerFailover({
        triggerReason: reason,
        timeoutMs: 10000,
        maxAttempts: 3
      })

      if (failoverResult.success) {
        this.currentDataSource = failoverResult.newDataSource as any
        this.failoverStats.successfulFailovers++
        this.failoverStats.lastFailoverTime = Date.now()
        
        return {
          success: true,
          message: `失效回退成功，切换到: ${this.currentDataSource}`,
          newDataSource: this.currentDataSource
        }
      } else {
        this.failoverStats.failedFailovers++
        this.failoverStats.lastError = failoverResult.error
        
        return {
          success: false,
          message: `失效回退失败: ${failoverResult.error}`
        }
      }
    } catch (error: any) {
      this.failoverStats.failedFailovers++
      this.failoverStats.lastError = error.message
      
      return {
        success: false,
        message: `失效回退异常: ${error.message}`
      }
    }
  }

  private assessDataQuality(): 'excellent' | 'good' | 'degraded' | 'poor' {
    try {
      const orderbookStats = this.pacificaOrderbookManager.getOrderbookStats()
      
      if (orderbookStats.length === 0) {
        return 'poor'
      }

      const now = Date.now()
      const maxAge = 30000 // 30秒
      const staleData = orderbookStats.some(stat => (now - stat.lastUpdate) > maxAge)
      
      if (staleData) {
        return 'degraded'
      }

      const highSpread = orderbookStats.some(stat => stat.spreadPercent > 0.01)
      
      if (highSpread) {
        return 'degraded'
      }

      const lowFrequency = orderbookStats.some(stat => stat.updateFrequency < 0.5)
      
      if (lowFrequency) {
        return 'good'
      }

      return 'excellent'
    } catch (error: any) {
      logger.error(`评估数据质量失败: ${error.message}`)
      return 'poor'
    }
  }

  private setupFailoverMonitoring(): void {
    logger.info('设置失效回退监控')

    // 监听订单簿管理器的错误事件
    this.pacificaOrderbookManager.on('error', async (error) => {
      logger.warn('订单簿管理器错误，检查失效回退', { error: error.message })
      await this.checkFailoverNeeded('orderbook_manager_error')
    })

    // 创建失效回退启动事件
    this.monitoringManager.addEvent({
      eventId: `failover-bridge-start-${Date.now()}`,
      type: 'failover-bridge-start',
      payload: {
        primaryFeeds: 1,
        backupFeeds: 1,
        synthSnapshots: 3
      },
      severity: 'INFO',
      createdAt: new Date()
    })

    logger.info('失效回退监控设置完成')
  }

  private generateSyntheticPrice(symbol: string): number {
    const basePrice = this.getHistoricalAverage(symbol)
    const volatility = this.getVolatility(symbol)
    const randomFactor = (Math.random() - 0.5) * 2 * volatility
    
    return basePrice * (1 + randomFactor)
  }

  private getHistoricalAverage(symbol: string): number {
    const averages: Record<string, number> = {
      'BTC': 108000,
      'ETH': 3200,
      'SOL': 180
    }
    return averages[symbol] || 1000
  }

  private getVolatility(symbol: string): number {
    const volatilities: Record<string, number> = {
      'BTC': 0.02,
      'ETH': 0.03,
      'SOL': 0.04
    }
    return volatilities[symbol] || 0.02
  }

  private getMarketTrend(symbol: string): 'bullish' | 'bearish' | 'neutral' {
    const trends = ['bullish', 'bearish', 'neutral'] as const
    return trends[Math.floor(Math.random() * trends.length)]
  }

  getBridgeStats(): any {
    return {
      primaryFeeds: 1,
      backupFeeds: 1,
      synthPriceSnapshots: this.synthPriceSnapshotManager.getAllSnapshots().length,
      failoverEvents: this.failoverStats.totalFailovers,
      lastFailoverTime: this.failoverStats.lastFailoverTime,
      currentDataSource: this.currentDataSource,
      dataQuality: this.assessDataQuality(),
      bridgeMode: true
    }
  }
}

async function main() {
  logger.info('=== T031 市场数据失效回退桥接演示 ===')

  try {
    // 1. 创建模拟组件
    const mockOrderbookManager = new MockPacificaOrderbookManager()
    const mockFailoverService = new MockMarketDataFailoverService()
    const mockFeedManager = new MockMarketDataFeedManager()
    const mockSynthSnapshotManager = new MockSynthPriceSnapshotManager()
    const mockMonitoringManager = new MockMonitoringEventManager()

    // 2. 初始化订单簿管理器
    await mockOrderbookManager.initialize()
    await mockOrderbookManager.start()

    // 3. 创建市场数据失效回退桥接器
    const marketDataBridge = new SimpleMarketDataFailoverBridge(
      mockOrderbookManager,
      mockFailoverService,
      mockFeedManager,
      mockSynthSnapshotManager,
      mockMonitoringManager
    )

    // 4. 启动市场数据桥接器
    logger.info('启动市场数据失效回退桥接器...')
    await marketDataBridge.start()

    // 5. 检查初始状态
    const initialStats = marketDataBridge.getBridgeStats()
    logger.info('初始市场数据桥接统计:', initialStats)

    // 6. 执行手动失效回退测试
    logger.info('执行手动失效回退测试...')
    const failoverResult = await marketDataBridge.triggerFailover('manual_test')
    logger.info('失效回退结果:', failoverResult)

    // 7. 模拟数据源错误
    logger.info('模拟主要数据源错误...')
    mockOrderbookManager.triggerError(new Error('模拟WebSocket连接错误'))

    // 8. 等待健康检查处理
    await new Promise(resolve => setTimeout(resolve, 6000))

    // 9. 检查失效回退后状态
    const finalStats = marketDataBridge.getBridgeStats()
    logger.info('最终市场数据桥接统计:', finalStats)

    // 10. 验证数据一致性
    logger.info('验证数据一致性...')
    const marketDataFeeds = mockFeedManager.getAllFeeds()
    const synthSnapshots = mockSynthSnapshotManager.getAllSnapshots()
    const monitoringEvents = mockMonitoringManager.getAllEvents()

    logger.info(`验证结果:`)
    logger.info(`- 市场数据源: ${marketDataFeeds.length}`)
    logger.info(`- 合成价格快照: ${synthSnapshots.length}`)
    logger.info(`- 监控事件: ${monitoringEvents.length}`)
    logger.info(`- 当前数据源: ${finalStats.currentDataSource}`)
    logger.info(`- 数据质量: ${finalStats.dataQuality}`)
    logger.info(`- 失效回退事件: ${finalStats.failoverEvents}`)
    logger.info(`- 桥接模式: ${finalStats.bridgeMode ? '✅' : '❌'}`)
    logger.info(`- 数据一致性: ${marketDataFeeds.length > 0 && synthSnapshots.length > 0 ? '✅' : '❌'}`)

    // 11. 停止桥接器
    await marketDataBridge.stop()

    logger.info('=== T031 市场数据失效回退桥接演示完成 ===')

  } catch (error: any) {
    logger.error('T031 演示失败:', { error: error.message, stack: error.stack })
    process.exit(1)
  }
}

// 运行演示
if (import.meta.url === `file://${process.argv[1]}`) {
  main().catch(error => {
    logger.error('演示运行失败:', error)
    process.exit(1)
  })
}