/**
 * Contract test for IUniversalHttpClient.batchRequest()
 *
 * This test validates the batch request functionality of the Universal HTTP Client
 * according to the contract specification. Tests MUST FAIL until implementation is complete.
 */

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

// Import types that will be implemented
import type { IUniversalHttpClient, HttpClientRequest, HttpClientResponse, BatchRequestOptions, BatchResult } from '@/types/httpClientCore'

describe('IUniversalHttpClient.batchRequest() Contract', () => {
  let httpClient: IUniversalHttpClient

  beforeEach(() => {
    // This will fail until IUniversalHttpClient is implemented
    // eslint-disable-next-line @typescript-eslint/no-require-imports
    const { HttpClientCore } = require('@/core/http-client/HttpClientCore')
    httpClient = new HttpClientCore()
  })

  describe('Basic Batch Functionality', () => {
    test('should execute multiple requests in parallel', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'account-1',
          method: 'GET',
          url: '/api/v1/account/info'
        },
        {
          platform: 'binance',
          accountId: 'account-2',
          method: 'GET',
          url: '/api/v3/account'
        },
        {
          platform: 'aster',
          accountId: 'account-3',
          method: 'GET',
          url: '/api/balances'
        }
      ]

      const batchResult: BatchResult = await httpClient.batchRequest(requests)

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(3)
      expect(batchResult.summary).toBeDefined()
      expect(batchResult.summary.total).toBe(3)
      expect(batchResult.summary.successful).toBeGreaterThanOrEqual(0)
      expect(batchResult.summary.failed).toBeGreaterThanOrEqual(0)
      expect(batchResult.summary.successful + batchResult.summary.failed).toBe(3)
      expect(batchResult.summary.totalDuration).toBeGreaterThan(0)
      expect(batchResult.summary.averageDuration).toBeGreaterThan(0)

      // Verify each result
      batchResult.results.forEach((result, index) => {
        expect(result).toBeDefined()
        expect(result.requestIndex).toBe(index)
        expect(result.duration).toBeGreaterThan(0)
        if (result.success) {
          expect(result.data).toBeDefined()
          expect(result.error).toBeUndefined()
        } else {
          expect(result.error).toBeDefined()
          expect(result.data).toBeUndefined()
        }
      })
    })

    test('should handle batch with custom options', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'account-1',
          method: 'GET',
          url: '/api/v1/markets'
        },
        {
          platform: 'pacifica',
          accountId: 'account-2',
          method: 'GET',
          url: '/api/v1/trades'
        }
      ]

      const options: BatchRequestOptions = {
        concurrency: 2,
        failFast: false,
        retryFailedRequests: true,
        timeout: 30000
      }

      const batchResult: BatchResult = await httpClient.batchRequest(requests, options)

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(2)
      expect(batchResult.summary.total).toBe(2)
    })

    test('should respect concurrency limits', async () => {
      const requests: HttpClientRequest[] = Array.from({ length: 10 }, (_, i) => ({
        platform: 'pacifica',
        accountId: `account-${i}`,
        method: 'GET',
        url: '/api/v1/ping'
      }))

      const options: BatchRequestOptions = {
        concurrency: 3
      }

      const startTime = Date.now()
      const batchResult: BatchResult = await httpClient.batchRequest(requests, options)
      const duration = Date.now() - startTime

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(10)

      // With concurrency limit of 3, should take roughly 4 batches (10/3 = 3.33)
      // So duration should be longer than 1 batch but less than 10 sequential
      expect(duration).toBeGreaterThan(100) // Minimum for 4 batches
      expect(duration).toBeLessThan(1000) // Much less than 10 sequential requests
    })
  })

  describe('Error Handling and Resilience', () => {
    test('should handle partial failures without affecting other requests', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'valid-account',
          method: 'GET',
          url: '/api/v1/account/info'
        },
        {
          platform: 'invalid-platform',
          accountId: 'account-2',
          method: 'GET',
          url: '/api/invalid'
        },
        {
          platform: 'aster',
          accountId: 'valid-account',
          method: 'GET',
          url: '/api/balances'
        }
      ]

      const batchResult: BatchResult = await httpClient.batchRequest(requests)

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(3)
      expect(batchResult.summary.successful).toBeGreaterThan(0)
      expect(batchResult.summary.failed).toBeGreaterThan(0)

      // First and third requests should succeed, second should fail
      expect(batchResult.results[0].success).toBe(true)
      expect(batchResult.results[1].success).toBe(false)
      expect(batchResult.results[2].success).toBe(true)
    })

    test('should support fail-fast mode', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'invalid-platform',
          accountId: 'account-1',
          method: 'GET',
          url: '/api/invalid'
        },
        {
          platform: 'pacifica',
          accountId: 'account-2',
          method: 'GET',
          url: '/api/v1/account/info'
        },
        {
          platform: 'aster',
          accountId: 'account-3',
          method: 'GET',
          url: '/api/balances'
        }
      ]

      const options: BatchRequestOptions = {
        failFast: true
      }

      await expect(httpClient.batchRequest(requests, options)).rejects.toThrow()
    })

    test('should retry failed requests when configured', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'flaky-account',
          method: 'GET',
          url: '/api/v1/flaky-endpoint' // This should fail initially but succeed on retry
        }
      ]

      const options: BatchRequestOptions = {
        retryFailedRequests: true,
        failFast: false
      }

      const batchResult: BatchResult = await httpClient.batchRequest(requests, options)

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(1)

      // Should eventually succeed after retry
      expect(batchResult.summary.successful).toBe(1)
      expect(batchResult.summary.failed).toBe(0)
    })
  })

  describe('Performance Requirements', () => {
    test('should execute batch requests faster than sequential execution', async () => {
      const requests: HttpClientRequest[] = Array.from({ length: 5 }, (_, i) => ({
        platform: 'pacifica',
        accountId: `account-${i}`,
        method: 'GET',
        url: '/api/v1/ping'
      }))

      // Execute sequential requests for comparison
      const sequentialStart = Date.now()
      for (const request of requests) {
        await httpClient.request(request)
      }
      const sequentialDuration = Date.now() - sequentialStart

      // Execute batch requests
      const batchStart = Date.now()
      const batchResult: BatchResult = await httpClient.batchRequest(requests)
      const batchDuration = Date.now() - batchStart

      expect(batchResult).toBeDefined()
      expect(batchResult.summary.successful).toBe(5)

      // Batch should be significantly faster than sequential
      expect(batchDuration).toBeLessThan(sequentialDuration * 0.8)
    })

    test('should handle high-volume concurrent requests', async () => {
      const requests: HttpClientRequest[] = Array.from({ length: 100 }, (_, i) => ({
        platform: 'pacifica',
        accountId: `account-${i % 10}`, // Reuse 10 accounts
        method: 'GET',
        url: '/api/v1/ping'
      }))

      const options: BatchRequestOptions = {
        concurrency: 10
      }

      const startTime = Date.now()
      const batchResult: BatchResult = await httpClient.batchRequest(requests, options)
      const duration = Date.now() - startTime

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(100)
      expect(batchResult.summary.successful).toBeGreaterThan(90) // Allow some failures

      // Should complete within reasonable time
      expect(duration).toBeLessThan(5000) // 5 seconds for 100 requests
    })
  })

  describe('Platform Integration', () => {
    test('should handle mixed platform requests correctly', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'pacifica-account',
          method: 'GET',
          url: '/api/v1/account/info'
        },
        {
          platform: 'binance',
          accountId: 'binance-account',
          method: 'GET',
          url: '/api/v3/account'
        },
        {
          platform: 'aster',
          accountId: 'aster-account',
          method: 'GET',
          url: '/api/balances'
        }
      ]

      const batchResult: BatchResult = await httpClient.batchRequest(requests)

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(3)

      // Verify platform-specific handling
      batchResult.results.forEach((result, index) => {
        if (result.success) {
          const expectedPlatform = requests[index].platform
          // Platform-specific verification would be implemented here
          expect(result.data).toBeDefined()
        }
      })
    })

    test('should maintain authentication context per platform', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'account-1',
          method: 'POST',
          url: '/api/v1/orders',
          body: { test: 'data' }
        },
        {
          platform: 'binance',
          accountId: 'account-2',
          method: 'POST',
          url: '/api/v3/order',
          body: { test: 'data' }
        }
      ]

      const batchResult: BatchResult = await httpClient.batchRequest(requests)

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(2)

      // Each request should be properly authenticated for its platform
      batchResult.results.forEach((result, index) => {
        if (result.success) {
          expect(result.data).toBeDefined()
          // Authentication verification would be platform-specific
        }
      })
    })
  })

  describe('Resource Management', () => {
    test('should manage memory efficiently with large batches', async () => {
      const requests: HttpClientRequest[] = Array.from({ length: 1000 }, (_, i) => ({
        platform: 'pacifica',
        accountId: `account-${i % 50}`,
        method: 'GET',
        url: '/api/v1/ping'
      }))

      const options: BatchRequestOptions = {
        concurrency: 20
      }

      // Monitor memory usage (basic check)
      const initialMemory = process.memoryUsage().heapUsed

      const batchResult: BatchResult = await httpClient.batchRequest(requests, options)

      const finalMemory = process.memoryUsage().heapUsed
      const memoryIncrease = finalMemory - initialMemory

      expect(batchResult).toBeDefined()
      expect(batchResult.results).toHaveLength(1000)

      // Memory increase should be reasonable (less than 50MB for 1000 simple requests)
      expect(memoryIncrease).toBeLessThan(50 * 1024 * 1024)
    })

    test('should timeout batch requests appropriately', async () => {
      const requests: HttpClientRequest[] = [
        {
          platform: 'pacifica',
          accountId: 'slow-account',
          method: 'GET',
          url: '/api/v1/slow-endpoint' // This should take longer than timeout
        }
      ]

      const options: BatchRequestOptions = {
        timeout: 1000 // 1 second timeout
      }

      const startTime = Date.now()
      const batchResult: BatchResult = await httpClient.batchRequest(requests, options)
      const duration = Date.now() - startTime

      expect(batchResult).toBeDefined()
      expect(duration).toBeLessThan(2000) // Should timeout before 2 seconds
      expect(batchResult.summary.failed).toBeGreaterThan(0) // Should have timeout failures
    })
  })
})