import { describe, test, expect, beforeEach, afterEach } from '@jest/globals'

/**
 * 行情回退事件契约测试
 * 基于 contracts/market-data-failover.md 的规范
 */
describe('Market Data Failover Contract Tests', () => {
  beforeEach(() => {
    // 设置测试环境
  })

  afterEach(() => {
    // 清理测试环境
  })

  describe('Market Data Failover Events', () => {
    it('should emit failover initiation event', async () => {
      const failoverEvent = {
        eventId: 'test-failover-uuid',
        eventType: 'market-data-failover',
        exchange: 'pacifica',
        symbol: 'BTC',
        primaryChannel: 'websocket',
        backupChannel: 'http',
        detectTimestamp: '2025-09-27T12:10:00Z',
        failoverDeadlineMs: 10000,
        reason: 'ws-stale-data',
        metrics: {
          wsLastUpdateMs: 3000,
          httpLatencyMs: 400
        }
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Failover initiation event not implemented yet')
      }).toThrow('Failover initiation event not implemented yet')
    })

    it('should emit failover completion event', async () => {
      const completionEvent = {
        eventId: 'test-failover-uuid',
        eventType: 'market-data-failover-complete',
        exchange: 'pacifica',
        symbol: 'BTC',
        completedTimestamp: '2025-09-27T12:10:07Z',
        failoverMethod: 'http',
        synthPrice: {
          mid: 109305.2,
          bid: 109302.1,
          ask: 109308.3
        },
        durationMs: 7000,
        triggeredOrders: [
          'recalc-delta',
          'resume-trading'
        ]
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Failover completion event not implemented yet')
      }).toThrow('Failover completion event not implemented yet')
    })

    it('should emit failover failure alert', async () => {
      const failureEvent = {
        eventId: 'test-failover-failed-uuid',
        eventType: 'market-data-failover-failed',
        exchange: 'pacifica',
        symbol: 'BTC',
        elapsedMs: 12000,
        attempts: [
          { channel: 'http', result: 'timeout' },
          { channel: 'synth', result: 'insufficient-data' }
        ],
        recommendedAction: 'halt-trading',
        severity: 'CRITICAL'
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Failover failure alert not implemented yet')
      }).toThrow('Failover failure alert not implemented yet')
    })

    it('should handle WebSocket stale data detection', async () => {
      const staleDataEvent = {
        eventId: 'test-stale-data-uuid',
        eventType: 'market-data-failover',
        exchange: 'aster',
        symbol: 'ETH',
        primaryChannel: 'websocket',
        backupChannel: 'http',
        detectTimestamp: '2025-09-27T12:11:00Z',
        failoverDeadlineMs: 10000,
        reason: 'ws-stale-data',
        metrics: {
          wsLastUpdateMs: 5000, // 超过 2s 阈值
          httpLatencyMs: 200
        }
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Stale data detection not implemented yet')
      }).toThrow('Stale data detection not implemented yet')
    })

    it('should handle WebSocket connection failure', async () => {
      const connectionFailureEvent = {
        eventId: 'test-connection-fail-uuid',
        eventType: 'market-data-failover',
        exchange: 'binance',
        symbol: 'BTC',
        primaryChannel: 'websocket',
        backupChannel: 'http',
        detectTimestamp: '2025-09-27T12:12:00Z',
        failoverDeadlineMs: 10000,
        reason: 'ws-connection-lost',
        metrics: {
          wsLastUpdateMs: 0,
          httpLatencyMs: 300
        }
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Connection failure handling not implemented yet')
      }).toThrow('Connection failure handling not implemented yet')
    })

    it('should complete failover within deadline', async () => {
      const startTime = Date.now()
      
      // 模拟快速回退（7秒内完成）
      const quickFailoverEvent = {
        eventId: 'test-quick-failover-uuid',
        eventType: 'market-data-failover-complete',
        exchange: 'pacifica',
        symbol: 'BTC',
        completedTimestamp: '2025-09-27T12:13:07Z',
        failoverMethod: 'http',
        synthPrice: {
          mid: 109305.2,
          bid: 109302.1,
          ask: 109308.3
        },
        durationMs: 7000,
        triggeredOrders: ['resume-trading']
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Deadline compliance not implemented yet')
      }).toThrow('Deadline compliance not implemented yet')
    })

    it('should handle synthetic price generation', async () => {
      const synthPriceEvent = {
        eventId: 'test-synth-price-uuid',
        eventType: 'market-data-failover-complete',
        exchange: 'aster',
        symbol: 'ETH',
        completedTimestamp: '2025-09-27T12:14:00Z',
        failoverMethod: 'synth',
        synthPrice: {
          mid: 3421.5,
          bid: 3420.1,
          ask: 3422.9
        },
        durationMs: 8500,
        triggeredOrders: ['resume-trading']
      }

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Synthetic price generation not implemented yet')
      }).toThrow('Synthetic price generation not implemented yet')
    })

    it('should validate failover reason codes', async () => {
      const validReasons = [
        'ws-stale-data',
        'ws-connection-lost',
        'ws-timeout',
        'ws-auth-failed',
        'http-timeout',
        'http-rate-limit'
      ]

      validReasons.forEach(reason => {
        const event = {
          eventId: 'test-reason-uuid',
          eventType: 'market-data-failover',
          exchange: 'pacifica',
          symbol: 'BTC',
          primaryChannel: 'websocket',
          backupChannel: 'http',
          detectTimestamp: '2025-09-27T12:15:00Z',
          failoverDeadlineMs: 10000,
          reason,
          metrics: {
            wsLastUpdateMs: 3000,
            httpLatencyMs: 400
          }
        }

        // 这个测试应该失败，因为还没有实现
        expect(() => {
          throw new Error('Reason code validation not implemented yet')
        }).toThrow('Reason code validation not implemented yet')
      })
    })

    it('should handle multiple exchange failover simultaneously', async () => {
      const multiExchangeEvents = [
        {
          eventId: 'test-pacifica-failover',
          eventType: 'market-data-failover',
          exchange: 'pacifica',
          symbol: 'BTC',
          primaryChannel: 'websocket',
          backupChannel: 'http',
          detectTimestamp: '2025-09-27T12:16:00Z',
          failoverDeadlineMs: 10000,
          reason: 'ws-stale-data',
          metrics: { wsLastUpdateMs: 3000, httpLatencyMs: 400 }
        },
        {
          eventId: 'test-aster-failover',
          eventType: 'market-data-failover',
          exchange: 'aster',
          symbol: 'BTC',
          primaryChannel: 'websocket',
          backupChannel: 'http',
          detectTimestamp: '2025-09-27T12:16:01Z',
          failoverDeadlineMs: 10000,
          reason: 'ws-connection-lost',
          metrics: { wsLastUpdateMs: 0, httpLatencyMs: 200 }
        }
      ]

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Multi-exchange failover not implemented yet')
      }).toThrow('Multi-exchange failover not implemented yet')
    })
  })

  describe('Market Data Failover Business Rules', () => {
    it('should write all events to logs and MonitoringEvent', () => {
      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Event persistence not implemented yet')
      }).toThrow('Event persistence not implemented yet')
    })

    it('should halt trading on critical failover failure', () => {
      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Trading halt on failure not implemented yet')
      }).toThrow('Trading halt on failure not implemented yet')
    })

    it('should provide latest price data in completion events', () => {
      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Price data provision not implemented yet')
      }).toThrow('Price data provision not implemented yet')
    })

    it('should track failover metrics for performance monitoring', () => {
      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Failover metrics tracking not implemented yet')
      }).toThrow('Failover metrics tracking not implemented yet')
    })

    it('should support manual recovery after automatic failover', () => {
      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Manual recovery support not implemented yet')
      }).toThrow('Manual recovery support not implemented yet')
    })
  })
})