/**
 * Integration Test: Health Check Use Case Orchestration
 * 
 * Tests the orchestration logic of health check-related Use Cases:
 * - CheckApiHealthUseCase: Executes health checks and returns status
 * - GetConnectionStatusUseCase: Retrieves current connection status
 * - Validates that Use Cases correctly interact with their Ports (Health Check Adapter, Event Publisher)
 * - Uses In-Memory adapters for fast, deterministic testing
 * 
 * Focus: Business logic orchestration, NOT UI rendering
 */

import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
import { InMemoryHealthCheckAdapter } from '../../../adapters/health/persistence/inmemory/InMemoryHealthCheckAdapter';
import { InMemoryEventPublisher } from '../../../adapters/events/InMemoryEventPublisher';
import { CheckApiHealthUseCase } from '../../../core/health/use-cases/CheckApiHealthUseCase';
import { GetConnectionStatusUseCase } from '../../../core/health/use-cases/GetConnectionStatusUseCase';
import { HealthCheckQuery } from '../../../core/health/ports/HealthCheckQuery';

describe('Health Check Use Case Orchestration', () => {
  let healthCheckAdapter: InMemoryHealthCheckAdapter;
  let eventPublisher: InMemoryEventPublisher;
  let checkApiHealthUseCase: CheckApiHealthUseCase;
  let getConnectionStatusUseCase: GetConnectionStatusUseCase;

  beforeAll(() => {
    // TODO: Initialize In-Memory adapters and event publisher
    // healthCheckAdapter = new InMemoryHealthCheckAdapter();
    // eventPublisher = new InMemoryEventPublisher();
    // checkApiHealthUseCase = new CheckApiHealthUseCase({
    //   healthCheckAdapter,
    //   eventPublisher,
    // });
    // getConnectionStatusUseCase = new GetConnectionStatusUseCase({
    //   healthCheckAdapter,
    // });
  });

  beforeEach(() => {
    // TODO: Clear all In-Memory repositories before each test
    // healthCheckAdapter.clear();
    // eventPublisher.clear();
  });

  describe('CheckApiHealthUseCase - Success Path', () => {
    it('should perform health check and return healthy status', async () => {
      // TODO: Implement test
      // Scenario: API is healthy and responsive
      // Given: HealthCheckAdapter returns successful response
      // And: Response time is 50ms
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Result should show healthy=true
      // And: Response time should be 50ms
      // And: Timestamp should be present
      // And: EventPublisher should emit HealthCheckCompletedEvent
    });

    it('should perform health check with slow response time', async () => {
      // TODO: Implement test
      // Scenario: API is healthy but slow
      // Given: HealthCheckAdapter returns successful response
      // And: Response time is 500ms
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Result should show healthy=true
      // And: Response time should be 500ms
      // And: EventPublisher should emit HealthCheckCompletedEvent
    });

    it('should handle health check with custom endpoint', async () => {
      // TODO: Implement test
      // Scenario: Health check on custom endpoint
      // Given: HealthCheckAdapter returns success for /custom/health
      // When: CheckApiHealthUseCase.execute() is called with custom endpoint
      // Then: Result should show healthy=true
      // And: Should use the custom endpoint
    });
  });

  describe('CheckApiHealthUseCase - Failure Path', () => {
    it('should handle failed health check and return unhealthy status', async () => {
      // TODO: Implement test
      // Scenario: API is unreachable
      // Given: HealthCheckAdapter throws network error
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Result should show healthy=false
      // And: Error message should be present
      // And: EventPublisher should emit HealthCheckFailedEvent
    });

    it('should handle timeout during health check', async () => {
      // TODO: Implement test
      // Scenario: Health check times out
      // Given: HealthCheckAdapter times out after 30 seconds
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Result should show healthy=false
      // And: Error should indicate timeout
      // And: EventPublisher should emit HealthCheckTimeoutEvent
    });

    it('should handle malformed response from health endpoint', async () => {
      // TODO: Implement test
      // Scenario: Health endpoint returns invalid JSON
      // Given: HealthCheckAdapter returns malformed response
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Result should show healthy=false
      // And: Error should indicate parsing failure
      // And: EventPublisher should emit HealthCheckFailedEvent
    });
  });

  describe('GetConnectionStatusUseCase - Success Path', () => {
    it('should retrieve connection status when healthy', async () => {
      // TODO: Implement test
      // Scenario: Connection is healthy
      // Given: HealthCheckAdapter has successful checks
      // And: Connection status is 'connected'
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show status='connected'
      // And: Reliability should be 100%
      // And: Last check timestamp should be present
    });

    it('should retrieve connection status when degraded', async () => {
      // TODO: Implement test
      // Scenario: Connection is degraded
      // Given: HealthCheckAdapter has mixed results (5 success, 3 fail)
      // And: Connection status is 'degraded'
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show status='degraded'
      // And: Reliability should be 62.5%
      // And: Consecutive failures should be 0
    });

    it('should retrieve connection status when disconnected', async () => {
      // TODO: Implement test
      // Scenario: Connection is disconnected
      // Given: HealthCheckAdapter has 3 consecutive failures
      // And: Connection status is 'disconnected'
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show status='disconnected'
      // And: Consecutive failures should be 3
      // And: Last failure timestamp should be present
    });

    it('should retrieve connection status when checking', async () => {
      // TODO: Implement test
      // Scenario: Connection status is checking
      // Given: No health checks performed yet
      // And: Connection status is 'checking'
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show status='checking'
      // And: Reliability should be 0
    });
  });

  describe('GetConnectionStatusUseCase - Metrics', () => {
    it('should calculate reliability correctly', async () => {
      // TODO: Implement test
      // Scenario: Calculate reliability from mixed results
      // Given: 7 successful requests and 3 failed requests
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show reliability=70%
      // And: Total requests should be 10
      // And: Successful requests should be 7
      // And: Failed requests should be 3
    });

    it('should calculate average response time correctly', async () => {
      // TODO: Implement test
      // Scenario: Calculate average from varying response times
      // Given: Response times of 50ms, 100ms, 150ms
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show averageResponseTime=100ms
    });

    it('should handle zero requests for metrics calculation', async () => {
      // TODO: Implement test
      // Scenario: No requests made yet
      // Given: No health checks performed
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should show reliability=0
      // And: Average response time should be 0
      // And: Total requests should be 0
    });
  });

  describe('Health Check Data Orchestration', () => {
    it('should correctly format health check result with all fields', async () => {
      // TODO: Implement test
      // Scenario: Complete health check result
      // Given: HealthCheckAdapter returns successful response
      // And: Response time is 75ms
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Result should contain:
      // - healthy: true
      // - responseTime: 75
      // - timestamp: (current timestamp)
      // - endpoint: '/health'
      // - error: undefined
    });

    it('should correctly format connection status with all fields', async () => {
      // TODO: Implement test
      // Scenario: Complete connection status
      // Given: HealthCheckAdapter has 5 success, 3 fail
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should contain:
      // - status: 'degraded'
      // - reliability: 62.5
      // - totalRequests: 8
      // - successfulRequests: 5
      // - failedRequests: 3
      // - consecutiveFailures: 0
      // - averageResponseTime: (calculated)
      // - lastCheck: (timestamp)
      // - lastSuccess: (timestamp)
      // - lastFailure: (timestamp)
    });

    it('should correctly format connection status when disconnected', async () => {
      // TODO: Implement test
      // Scenario: Connection is disconnected
      // Given: HealthCheckAdapter has 3 consecutive failures
      // When: GetConnectionStatusUseCase.execute() is called
      // Then: Result should contain:
      // - status: 'disconnected'
      // - consecutiveFailures: 3
      // - lastFailure: (timestamp)
      // - lastSuccess: (timestamp from before failures)
    });
  });

  describe('Event Emission Patterns', () => {
    it('should emit HealthCheckCompletedEvent on successful check', async () => {
      // TODO: Implement test
      // Scenario: Successful health check
      // Given: HealthCheckAdapter returns success
      // When: CheckApiHealthUseCase.execute() is called
      // Then: EventPublisher should emit HealthCheckCompletedEvent
      // And: Event should include health check result
    });

    it('should emit HealthCheckFailedEvent on failed check', async () => {
      // TODO: Implement test
      // Scenario: Failed health check
      // Given: HealthCheckAdapter throws error
      // When: CheckApiHealthUseCase.execute() is called
      // Then: EventPublisher should emit HealthCheckFailedEvent
      // And: Event should include error details
    });

    it('should emit ConnectionStatusChangedEvent on status change', async () => {
      // TODO: Implement test
      // Scenario: Connection status changes
      // Given: Current status is 'disconnected'
      // And: HealthCheckAdapter returns success
      // When: CheckApiHealthUseCase.execute() is called
      // Then: EventPublisher should emit ConnectionStatusChangedEvent
      // And: Event should include old and new status
    });
  });

  describe('Error Handling', () => {
    it('should handle adapter errors gracefully', async () => {
      // TODO: Implement test
      // Scenario: HealthCheckAdapter throws unexpected error
      // Given: HealthCheckAdapter throws generic error
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Should not throw unhandled error
      // And: Should return unhealthy status
      // And: Should include error message
    });

    it('should handle invalid endpoint configuration', async () => {
      // TODO: Implement test
      // Scenario: Invalid endpoint provided
      // Given: Invalid endpoint string
      // When: CheckApiHealthUseCase.execute() is called
      // Then: Should handle validation error
      // And: Should return error status
    });

    it('should handle concurrent health check calls', async () => {
      // TODO: Implement test
      // Scenario: Multiple simultaneous health checks
      // Given: CheckApiHealthUseCase.execute() is already running
      // When: CheckApiHealthUseCase.execute() is called again
      // Then: Should return existing result
      // And: Should not start duplicate checks
    });
  });
});