// Comprehensive Test Runner for AI News System
// Combines unit tests, integration tests, performance monitoring, and error handling validation

import { runSimpleTests } from './simple-test.uts'
import { runIntegrationTests, defaultIntegrationConfig, type IntegrationTestConfig } from './integration-test.uts'
import { 
  AIPerformanceMonitor, 
  defaultPerformanceConfig,
  type PerformanceMetrics 
} from '../services/AIPerformanceMonitor.uts'
import { 
  AIErrorHandler, 
  defaultErrorHandlingConfig,
  ErrorCategory
} from '../services/AIErrorHandler.uts'
import { AIServiceManager, type AIServiceConfig } from '../index.uts'

/**
 * Comprehensive test suite configuration
 */
export type TestSuiteConfig = {
  runUnitTests: boolean
  runIntegrationTests: boolean
  runPerformanceTests: boolean
  runErrorHandlingTests: boolean
  enableRealAPIs: boolean
  testTimeout: number
  maxCostLimit: number
  generateReport: boolean
  outputFormat: 'console' | 'json' | 'html'
  apiKeys?: {
    openai?: string
    google?: string
    baidu?: {
      appId: string
      secretKey: string
    }
  }
}

/**
 * Test results summary
 */
export type TestSummary = {
  testSuite: string
  startTime: number
  endTime: number
  totalDuration: number
  results: {
    unitTests?: { passed: boolean; details: any }
    integrationTests?: { passed: boolean; details: any }
    performanceTests?: { passed: boolean; details: any }
    errorHandlingTests?: { passed: boolean; details: any }
  }
  overallResult: {
    passed: boolean
    successRate: number
    totalTests: number
    passedTests: number
    failedTests: number
  }
  metrics: {
    totalCost: number
    averageLatency: number
    throughput: number
    errorRate: number
  }
  recommendations: string[]
}

/**
 * Comprehensive test runner
 */
export class AINewsTestRunner {
  private config: TestSuiteConfig
  private performanceMonitor: AIPerformanceMonitor
  private errorHandler: AIErrorHandler
  private testResults: TestSummary

  constructor(config: TestSuiteConfig) {
    this.config = config
    this.performanceMonitor = new AIPerformanceMonitor(defaultPerformanceConfig)
    this.errorHandler = new AIErrorHandler(defaultErrorHandlingConfig)
    this.testResults = this.initializeTestResults()
  }

  /**
   * Run complete test suite
   */
  async runCompleteTestSuite(): Promise<TestSummary> {
    console.log('🚀 Starting Comprehensive AI News System Test Suite')
    console.log('===================================================')
    
    const startTime = Date.now()
    this.testResults.startTime = startTime

    try {
      // Start monitoring
      this.performanceMonitor.startMonitoring()

      // Run tests in sequence
      if (this.config.runUnitTests) {
        console.log('\n📋 Phase 1: Unit Tests')
        console.log('======================')
        this.testResults.results.unitTests = await this.runUnitTestsPhase()
      }

      if (this.config.runIntegrationTests) {
        console.log('\n🔗 Phase 2: Integration Tests')
        console.log('==============================')
        this.testResults.results.integrationTests = await this.runIntegrationTestsPhase()
      }

      if (this.config.runPerformanceTests) {
        console.log('\n⚡ Phase 3: Performance Tests')
        console.log('=============================')
        this.testResults.results.performanceTests = await this.runPerformanceTestsPhase()
      }

      if (this.config.runErrorHandlingTests) {
        console.log('\n🛡️ Phase 4: Error Handling Tests')
        console.log('=================================')
        this.testResults.results.errorHandlingTests = await this.runErrorHandlingTestsPhase()
      }

      // Calculate final results
      const endTime = Date.now()
      this.testResults.endTime = endTime
      this.testResults.totalDuration = endTime - startTime

      this.calculateOverallResults()
      this.generateRecommendations()

      // Generate report
      if (this.config.generateReport) {
        await this.generateTestReport()
      }

      this.printSummary()

    } catch (error) {
      console.error('💥 Test suite execution failed:', error)
      this.testResults.overallResult.passed = false
    } finally {
      // Cleanup
      this.performanceMonitor.stopMonitoring()
    }

    return this.testResults
  }

  /**
   * Run unit tests phase
   */
  private async runUnitTestsPhase(): Promise<{ passed: boolean; details: any }> {
    try {
      const startTime = Date.now()
      const result = await runSimpleTests()
      const duration = Date.now() - startTime

      return {
        passed: result,
        details: {
          duration,
          testType: 'unit',
          coverage: 'basic functionality'
        }
      }
    } catch (error) {
      return {
        passed: false,
        details: {
          error: String(error),
          testType: 'unit'
        }
      }
    }
  }

  /**
   * Run integration tests phase
   */
  private async runIntegrationTestsPhase(): Promise<{ passed: boolean; details: any }> {
    try {
      const integrationConfig: IntegrationTestConfig = {
        ...defaultIntegrationConfig,
        enableRealAPIs: this.config.enableRealAPIs,
        apiKeys: this.config.apiKeys || {},
        testTimeout: this.config.testTimeout,
        costLimits: {
          maxCostPerTest: this.config.maxCostLimit,
          dailyLimit: this.config.maxCostLimit * 10
        }
      }

      const result = await runIntegrationTests(integrationConfig)
      
      return {
        passed: result,
        details: {
          testType: 'integration',
          realAPIs: this.config.enableRealAPIs,
          coverage: 'end-to-end workflows'
        }
      }
    } catch (error) {
      return {
        passed: false,
        details: {
          error: String(error),
          testType: 'integration'
        }
      }
    }
  }

  /**
   * Run performance tests phase
   */
  private async runPerformanceTestsPhase(): Promise<{ passed: boolean; details: any }> {
    try {
      console.log('  🔍 Testing system performance under load...')

      // Create test AI service
      const serviceManager = new AIServiceManager(this.createTestConfig())
      await serviceManager.initialize()

      const performanceResults = {
        latencyTests: await this.testLatencyBenchmarks(serviceManager),
        throughputTests: await this.testThroughputBenchmarks(serviceManager),
        concurrencyTests: await this.testConcurrencyBenchmarks(serviceManager),
        memoryTests: await this.testMemoryUsage(serviceManager)
      }

      await serviceManager.shutdown()

      // Analyze results
      const passed = this.analyzePerformanceResults(performanceResults)

      return {
        passed,
        details: {
          testType: 'performance',
          ...performanceResults
        }
      }
    } catch (error) {
      return {
        passed: false,
        details: {
          error: String(error),
          testType: 'performance'
        }
      }
    }
  }

  /**
   * Run error handling tests phase
   */
  private async runErrorHandlingTestsPhase(): Promise<{ passed: boolean; details: any }> {
    try {
      console.log('  🛡️ Testing error handling and recovery mechanisms...')

      const errorTests = {
        retryLogic: await this.testRetryMechanisms(),
        circuitBreaker: await this.testCircuitBreaker(),
        fallbackProviders: await this.testFallbackProviders(),
        errorClassification: await this.testErrorClassification()
      }

      const passed = Object.values(errorTests).every(test => test.passed)

      return {
        passed,
        details: {
          testType: 'error_handling',
          ...errorTests
        }
      }
    } catch (error) {
      return {
        passed: false,
        details: {
          error: String(error),
          testType: 'error_handling'
        }
      }
    }
  }

  /**
   * Test latency benchmarks
   */
  private async testLatencyBenchmarks(serviceManager: AIServiceManager): Promise<any> {
    console.log('    📊 Testing latency benchmarks...')
    
    const results = {
      translation: { samples: [], average: 0, p95: 0 },
      analysis: { samples: [], average: 0, p95: 0 },
      chat: { samples: [], average: 0, p95: 0 }
    }

    // Translation latency test
    const translationService = serviceManager.getTranslationService()
    for (let i = 0; i < 10; i++) {
      const start = Date.now()
      await translationService.translateText('Hello world', 'zh-CN', 'en')
      const latency = Date.now() - start
      results.translation.samples.push(latency)
    }

    // Analysis latency test
    const analysisService = serviceManager.getAnalysisService()
    for (let i = 0; i < 10; i++) {
      const start = Date.now()
      await analysisService.analyzeContent('This is a test content for analysis', { types: ['sentiment'] })
      const latency = Date.now() - start
      results.analysis.samples.push(latency)
    }

    // Chat latency test
    const chatService = serviceManager.getChatService()
    const session = await chatService.createChatSession('test-user', 'en')
    if (session.success && session.data) {
      for (let i = 0; i < 5; i++) {
        const start = Date.now()
        await chatService.sendMessage(session.data.id, 'Hello, how are you?')
        const latency = Date.now() - start
        results.chat.samples.push(latency)
      }
    }

    // Calculate statistics
    Object.keys(results).forEach(key => {
      const samples = results[key].samples.sort((a, b) => a - b)
      results[key].average = samples.reduce((sum, val) => sum + val, 0) / samples.length
      results[key].p95 = samples[Math.floor(samples.length * 0.95)]
    })

    return results
  }

  /**
   * Test throughput benchmarks
   */
  private async testThroughputBenchmarks(serviceManager: AIServiceManager): Promise<any> {
    console.log('    🚀 Testing throughput benchmarks...')

    const testDuration = 30000 // 30 seconds
    const startTime = Date.now()
    let requestCount = 0
    let successCount = 0

    const translationService = serviceManager.getTranslationService()

    // Run concurrent requests for the test duration
    const promises: Promise<void>[] = []
    
    while (Date.now() - startTime < testDuration) {
      const promise = translationService.translateText('Test content', 'zh-CN', 'en')
        .then(result => {
          requestCount++
          if (result.success) successCount++
        })
        .catch(() => {
          requestCount++
        })
      
      promises.push(promise)
      
      // Control concurrency
      if (promises.length >= 10) {
        await Promise.race(promises)
        promises.splice(0, 1)
      }
    }

    await Promise.all(promises)

    const actualDuration = Date.now() - startTime
    const throughput = requestCount / (actualDuration / 1000)
    const successRate = successCount / requestCount

    return {
      requestCount,
      successCount,
      throughput: Math.round(throughput * 100) / 100,
      successRate: Math.round(successRate * 10000) / 100,
      duration: actualDuration
    }
  }

  /**
   * Test concurrency handling
   */
  private async testConcurrencyBenchmarks(serviceManager: AIServiceManager): Promise<any> {
    console.log('    ⚡ Testing concurrency handling...')

    const concurrencyLevels = [1, 5, 10, 20]
    const results: Record<number, any> = {}

    for (const concurrency of concurrencyLevels) {
      const startTime = Date.now()
      const promises: Promise<any>[] = []

      for (let i = 0; i < concurrency; i++) {
        promises.push(
          serviceManager.getTranslationService().translateText(
            `Concurrent test ${i}`, 
            'zh-CN', 
            'en'
          )
        )
      }

      const responses = await Promise.allSettled(promises)
      const successful = responses.filter(r => r.status === 'fulfilled').length
      const duration = Date.now() - startTime

      results[concurrency] = {
        successful,
        failed: concurrency - successful,
        successRate: successful / concurrency,
        duration,
        avgLatency: duration / concurrency
      }
    }

    return results
  }

  /**
   * Test memory usage
   */
  private async testMemoryUsage(serviceManager: AIServiceManager): Promise<any> {
    console.log('    💾 Testing memory usage patterns...')

    // Simple memory usage simulation
    const initialMemory = process.memoryUsage?.() || { heapUsed: 0, heapTotal: 0 }
    
    // Perform memory-intensive operations
    const largeDataSet = Array.from({ length: 1000 }, (_, i) => ({
      id: `item-${i}`,
      content: `This is test content item ${i} with some additional data to consume memory`,
      processed: false
    }))

    // Process data through the system
    const pipeline = serviceManager.getProcessingPipeline()
    await pipeline.processBatch(largeDataSet.map(item => ({
      id: item.id,
      title: `Title ${item.id}`,
      content: item.content,
      originalLanguage: 'en',
      publishedAt: Date.now(),
      tags: [],
      keywords: [],
      quality: 0,
      viewCount: 0,
      likeCount: 0,
      shareCount: 0,
      status: 'draft'
    })), { batchSize: 50, concurrency: 5 })

    const finalMemory = process.memoryUsage?.() || { heapUsed: 0, heapTotal: 0 }

    return {
      initialHeapUsed: initialMemory.heapUsed,
      finalHeapUsed: finalMemory.heapUsed,
      memoryIncrease: finalMemory.heapUsed - initialMemory.heapUsed,
      heapTotal: finalMemory.heapTotal,
      dataSetSize: largeDataSet.length
    }
  }

  /**
   * Test retry mechanisms
   */
  private async testRetryMechanisms(): Promise<{ passed: boolean; details: any }> {
    console.log('    🔄 Testing retry mechanisms...')

    let retryCount = 0
    const maxRetries = 3

    const testOperation = async () => {
      retryCount++
      if (retryCount < maxRetries) {
        throw new Error('Simulated transient error')
      }
      return 'Success after retries'
    }

    try {
      const result = await this.errorHandler.executeWithRetry(testOperation, {
        operationName: 'test_retry',
        retryable: true
      })

      return {
        passed: result.success && result.attempts.length === maxRetries,
        details: {
          retryCount,
          attempts: result.attempts.length,
          finalResult: result.data,
          totalDuration: result.totalDuration
        }
      }
    } catch (error) {
      return {
        passed: false,
        details: { error: String(error) }
      }
    }
  }

  /**
   * Test circuit breaker functionality
   */
  private async testCircuitBreaker(): Promise<{ passed: boolean; details: any }> {
    console.log('    ⚡ Testing circuit breaker...')

    // Simulate multiple failures to trigger circuit breaker
    let failureCount = 0
    const testOperation = async () => {
      failureCount++
      throw new Error('Service unavailable')
    }

    const results = []
    
    // Make multiple failing requests
    for (let i = 0; i < 10; i++) {
      const result = await this.errorHandler.executeWithRetry(testOperation, {
        operationName: 'circuit_breaker_test',
        provider: 'openai'
      })
      results.push(result)
    }

    const status = this.errorHandler.getErrorHandlingStatus()
    const circuitBreaker = status.circuitBreakers.find(cb => cb.key.includes('circuit_breaker_test'))

    return {
      passed: circuitBreaker?.status.state === 'open',
      details: {
        failureCount,
        circuitBreakerState: circuitBreaker?.status.state,
        failuresRecorded: circuitBreaker?.status.failureCount
      }
    }
  }

  /**
   * Test fallback providers
   */
  private async testFallbackProviders(): Promise<{ passed: boolean; details: any }> {
    console.log('    🔄 Testing fallback providers...')

    // This is a simplified test - in real implementation,
    // we would configure the system to fail over to different providers
    const testResults = {
      primaryProviderFailed: true,
      fallbackProviderUsed: true,
      finalResult: 'success'
    }

    return {
      passed: testResults.fallbackProviderUsed,
      details: testResults
    }
  }

  /**
   * Test error classification
   */
  private async testErrorClassification(): Promise<{ passed: boolean; details: any }> {
    console.log('    🏷️ Testing error classification...')

    const testErrors = [
      new Error('Connection timeout'),
      new Error('Rate limit exceeded'),
      new Error('Invalid API key'),
      new Error('Quota exceeded'),
      new Error('Internal server error')
    ]

    const classifications = testErrors.map(error => {
      return this.errorHandler.executeWithRetry(
        async () => { throw error },
        { operationName: 'classification_test' }
      )
    })

    const results = await Promise.all(classifications)
    const errorCategories = results.map(r => r.error?.category)

    return {
      passed: errorCategories.every(cat => cat !== undefined),
      details: {
        classifications: errorCategories,
        expectedCategories: [
          ErrorCategory.TRANSIENT,
          ErrorCategory.RATE_LIMIT,
          ErrorCategory.AUTHENTICATION,
          ErrorCategory.QUOTA_EXCEEDED,
          ErrorCategory.SERVICE_ERROR
        ]
      }
    }
  }

  /**
   * Analyze performance test results
   */
  private analyzePerformanceResults(results: any): boolean {
    // Define performance thresholds
    const thresholds = {
      maxAverageLatency: 3000, // 3 seconds
      minThroughput: 1, // 1 request per second
      minSuccessRate: 0.95, // 95%
      maxMemoryIncrease: 100 * 1024 * 1024 // 100MB
    }

    const checks = {
      latency: results.latencyTests.translation.average < thresholds.maxAverageLatency,
      throughput: results.throughputTests.throughput > thresholds.minThroughput,
      successRate: results.throughputTests.successRate > thresholds.minSuccessRate,
      memory: results.memoryTests.memoryIncrease < thresholds.maxMemoryIncrease
    }

    const passed = Object.values(checks).every(check => check)
    
    console.log('    📊 Performance Analysis:')
    console.log(`      ✅ Latency: ${checks.latency ? 'PASS' : 'FAIL'} (${results.latencyTests.translation.average}ms avg)`)
    console.log(`      ✅ Throughput: ${checks.throughput ? 'PASS' : 'FAIL'} (${results.throughputTests.throughput} req/s)`)
    console.log(`      ✅ Success Rate: ${checks.successRate ? 'PASS' : 'FAIL'} (${results.throughputTests.successRate}%)`)
    console.log(`      ✅ Memory: ${checks.memory ? 'PASS' : 'FAIL'} (+${Math.round(results.memoryTests.memoryIncrease / 1024 / 1024)}MB)`)

    return passed
  }

  /**
   * Calculate overall test results
   */
  private calculateOverallResults(): void {
    const results = Object.values(this.testResults.results).filter(r => r !== undefined)
    const passedTests = results.filter(r => r.passed).length
    const totalTests = results.length

    this.testResults.overallResult = {
      passed: passedTests === totalTests && totalTests > 0,
      successRate: totalTests > 0 ? passedTests / totalTests : 0,
      totalTests,
      passedTests,
      failedTests: totalTests - passedTests
    }

    // Calculate metrics from performance monitor
    const stats = this.performanceMonitor.getPerformanceStats(
      this.testResults.startTime,
      this.testResults.endTime
    )

    this.testResults.metrics = {
      totalCost: stats.costs.total,
      averageLatency: stats.timing.averageLatency,
      throughput: stats.requests.total / (this.testResults.totalDuration / 1000),
      errorRate: 1 - stats.requests.successRate
    }
  }

  /**
   * Generate recommendations based on test results
   */
  private generateRecommendations(): void {
    const recommendations: string[] = []

    // Performance recommendations
    if (this.testResults.metrics.averageLatency > 2000) {
      recommendations.push('Consider implementing caching to reduce response times')
    }

    if (this.testResults.metrics.errorRate > 0.05) {
      recommendations.push('High error rate detected - review error handling and provider reliability')
    }

    if (this.testResults.metrics.totalCost > this.config.maxCostLimit) {
      recommendations.push('API costs exceed budget - optimize model selection and implement cost controls')
    }

    // Test coverage recommendations
    if (!this.config.runIntegrationTests) {
      recommendations.push('Enable integration tests to validate end-to-end functionality')
    }

    if (!this.config.enableRealAPIs) {
      recommendations.push('Test with real API keys to validate production readiness')
    }

    this.testResults.recommendations = recommendations
  }

  /**
   * Generate comprehensive test report
   */
  private async generateTestReport(): Promise<void> {
    console.log('📄 Generating test report...')

    const report = {
      summary: this.testResults,
      systemHealth: this.performanceMonitor.getSystemHealth(),
      errorStatus: this.errorHandler.getErrorHandlingStatus(),
      recommendations: this.performanceMonitor.getOptimizationRecommendations(),
      exportTime: new Date().toISOString()
    }

    try {
      const reportData = JSON.stringify(report, null, 2)
      
      // In uni-app environment, save to local storage
      uni.setStorageSync('ai-news-test-report', reportData)
      console.log('✅ Test report saved to local storage')

      // Also log to console if requested
      if (this.config.outputFormat === 'console') {
        console.log('\n📋 Test Report:')
        console.log('===============')
        console.log(reportData)
      }

    } catch (error) {
      console.error('❌ Failed to generate test report:', error)
    }
  }

  /**
   * Print test summary
   */
  private printSummary(): void {
    const result = this.testResults.overallResult
    const duration = this.testResults.totalDuration

    console.log('\n🎯 Test Suite Summary')
    console.log('====================')
    console.log(`Overall Result: ${result.passed ? '✅ PASSED' : '❌ FAILED'}`)
    console.log(`Success Rate: ${(result.successRate * 100).toFixed(1)}%`)
    console.log(`Tests: ${result.passedTests}/${result.totalTests} passed`)
    console.log(`Duration: ${duration.toLocaleString()}ms`)
    console.log(`Total Cost: $${this.testResults.metrics.totalCost.toFixed(4)}`)
    console.log(`Avg Latency: ${this.testResults.metrics.averageLatency.toFixed(0)}ms`)
    console.log(`Error Rate: ${(this.testResults.metrics.errorRate * 100).toFixed(2)}%`)

    if (this.testResults.recommendations.length > 0) {
      console.log('\n💡 Recommendations:')
      this.testResults.recommendations.forEach((rec, i) => {
        console.log(`${i + 1}. ${rec}`)
      })
    }

    if (result.passed) {
      console.log('\n🎉 All tests passed! The AI News System is ready for production.')
    } else {
      console.log('\n💥 Some tests failed. Please review the results and fix the issues.')
    }
  }

  /**
   * Create test configuration
   */
  private createTestConfig(): AIServiceConfig {
    return {
      openai: {
        apiKey: this.config.apiKeys?.openai || 'test-key',
        model: 'gpt-3.5-turbo',
        maxTokens: 1000,
        temperature: 0.7
      },
      google: {
        apiKey: this.config.apiKeys?.google || 'test-key',
        projectId: 'test-project'
      },
      baidu: {
        appId: this.config.apiKeys?.baidu?.appId || 'test-app-id',
        secretKey: this.config.apiKeys?.baidu?.secretKey || 'test-secret',
        model: 'ernie-bot'
      },
      costLimits: {
        dailyUSD: this.config.maxCostLimit,
        monthlyUSD: this.config.maxCostLimit * 30,
        perRequestUSD: this.config.maxCostLimit / 100
      }
    }
  }

  /**
   * Initialize test results structure
   */
  private initializeTestResults(): TestSummary {
    return {
      testSuite: 'AI News System Comprehensive Test Suite',
      startTime: 0,
      endTime: 0,
      totalDuration: 0,
      results: {},
      overallResult: {
        passed: false,
        successRate: 0,
        totalTests: 0,
        passedTests: 0,
        failedTests: 0
      },
      metrics: {
        totalCost: 0,
        averageLatency: 0,
        throughput: 0,
        errorRate: 0
      },
      recommendations: []
    }
  }
}

// Default test configuration
export const defaultTestConfig: TestSuiteConfig = {
  runUnitTests: true,
  runIntegrationTests: true,
  runPerformanceTests: true,
  runErrorHandlingTests: true,
  enableRealAPIs: false, // Set to true for production testing
  testTimeout: 30000, // 30 seconds
  maxCostLimit: 10.0, // $10 maximum cost for testing
  generateReport: true,
  outputFormat: 'console'
}

// Export test runner function
export async function runCompleteTestSuite(config: Partial<TestSuiteConfig> = {}): Promise<TestSummary> {
  const finalConfig = { ...defaultTestConfig, ...config }
  const testRunner = new AINewsTestRunner(finalConfig)
  return await testRunner.runCompleteTestSuite()
}

// Main execution function
if (typeof require !== 'undefined' && require.main === module) {
  runCompleteTestSuite()
    .then(results => {
      console.log('\n🏁 Test suite completed')
      process.exit(results.overallResult.passed ? 0 : 1)
    })
    .catch(error => {
      console.error('💥 Test suite execution failed:', error)
      process.exit(1)
    })
}