import { describe, it, 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('Failover Trigger Events', () => {
    it('should emit failover event when primary source fails', async () => {
      const expectedFailoverEvent = {
        eventId: 'test-uuid-failover-123',
        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('Market data failover event emission not implemented yet')
      }).toThrow('Market data failover event emission not implemented yet')
    })

    it('should detect WebSocket stale data', async () => {
      // 模拟WebSocket数据超过2秒陈旧
      const staleDataThreshold = 2000 // 2秒
      const currentTime = Date.now()
      const lastUpdateTime = currentTime - 3000 // 3秒前

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

    it('should handle WebSocket connection failures', async () => {
      const connectionFailureReasons = [
        'connection-lost',
        'authentication-failed',
        'rate-limit-exceeded',
        'server-error'
      ]

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

    it('should validate failover deadline constraint', async () => {
      const maxFailoverDeadline = 10000 // 10秒

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

  describe('Failover Completion Events', () => {
    it('should emit completion event with synthetic price', async () => {
      const expectedCompletionEvent = {
        eventId: 'test-uuid-completion-456',
        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 calculate synthetic prices from multiple sources', async () => {
      const priceFeeds = [
        { exchange: 'pacifica', bid: 109300, ask: 109310 },
        { exchange: 'aster', bid: 109305, ask: 109315 },
        { exchange: 'binance', bid: 109302, ask: 109312 }
      ]

      // 预期合成价格应该是加权平均或中位数
      const expectedSynthPrice = {
        mid: 109307.5,
        bid: 109302.3,
        ask: 109312.3
      }

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

    it('should validate completion within deadline', async () => {
      const startTime = Date.now()
      const deadline = 10000 // 10秒

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

    it('should trigger delta recalculation after failover', async () => {
      const triggeredActions = ['recalc-delta', 'resume-trading']

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

  describe('Failover Failure Events', () => {
    it('should emit failure event when all sources fail', async () => {
      const expectedFailureEvent = {
        eventId: 'test-uuid-failure-789',
        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 event not implemented yet')
      }).toThrow('Failover failure event not implemented yet')
    })

    it('should track multiple failover attempts', async () => {
      const attempts = [
        { channel: 'http', result: 'timeout', durationMs: 5000 },
        { channel: 'http', result: 'timeout', durationMs: 3000 },
        { channel: 'synth', result: 'insufficient-data', durationMs: 2000 }
      ]

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

    it('should escalate to CRITICAL severity on total failure', async () => {
      const criticalFailureConditions = [
        'all-sources-down',
        'data-corruption',
        'authentication-total-failure'
      ]

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

    it('should recommend trading halt on critical failure', async () => {
      const recommendedActions = ['halt-trading', 'notify-operators', 'emergency-hedge']

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

  describe('Channel Switching Logic', () => {
    it('should switch from WebSocket to HTTP when detected', async () => {
      const switchingFlow = {
        from: 'websocket',
        to: 'http',
        trigger: 'stale-data',
        maxSwitchTime: 2000 // 2秒内完成切换
      }

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

    it('should fallback to synthetic pricing when HTTP fails', async () => {
      const fallbackFlow = {
        from: 'http',
        to: 'synthetic',
        trigger: 'http-timeout',
        requiresMinimumSources: 2
      }

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

    it('should validate minimum data sources for synthetic pricing', async () => {
      const minimumSources = 2
      const availableSources = ['pacifica', 'aster'] // 刚好满足最小要求

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

  describe('Business Rules Compliance', () => {
    it('should write all events to monitoring system', async () => {
      const eventTypes = [
        'market-data-failover',
        'market-data-failover-complete',
        'market-data-failover-failed'
      ]

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

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

    it('should preserve latest prices for order pricing', async () => {
      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('Price preservation for order pricing not implemented yet')
      }).toThrow('Price preservation for order pricing not implemented yet')
    })

    it('should restore normal operation after primary source recovery', async () => {
      const recoveryFlow = {
        trigger: 'primary-source-healthy',
        action: 'switch-back-to-primary',
        validationPeriod: 30000 // 30秒验证期
      }

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

    it('should maintain price freshness threshold of 2 seconds', async () => {
      const freshnessThreshold = 2000 // 2秒

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

    it('should complete failover within 10 second SLA', async () => {
      const failoverSLA = 10000 // 10秒

      // 这个测试应该失败，因为还没有实现
      expect(() => {
        throw new Error('10-second failover SLA not implemented yet')
      }).toThrow('10-second failover SLA not implemented yet')
    })
  })

  describe('Event Schema Validation', () => {
    it('should validate event structure', async () => {
      const requiredFields = [
        'eventId',
        'eventType',
        'exchange',
        'symbol',
        'detectTimestamp'
      ]

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

    it('should validate metrics format', async () => {
      const metricsSchema = {
        wsLastUpdateMs: 'number',
        httpLatencyMs: 'number'
      }

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

    it('should validate synthetic price format', async () => {
      const priceSchema = {
        mid: 'number',
        bid: 'number',
        ask: 'number'
      }

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