/**
 * Integration Test: API Connection Monitor Health Checks
 * 
 * Tests the orchestration logic of API connection health monitoring:
 * - ApiConnectionMonitor: Tracks connection status, performs health checks, records metrics
 * - Validates that health monitoring correctly interacts with its Ports (API endpoints, event emitters)
 * - Uses In-Memory adapters for fast, deterministic testing
 * 
 * Focus: Business logic orchestration, NOT UI rendering
 */

import { describe, it, expect, beforeAll, afterAll, beforeEach, vi } from 'vitest';
import { InMemoryHealthCheckAdapter } from '../../../adapters/health/persistence/inmemory/InMemoryHealthCheckAdapter';
import { InMemoryEventPublisher } from '../../../adapters/events/InMemoryEventPublisher';
import { ApiConnectionMonitor } from '../../../apps/website/lib/api/base/ApiConnectionMonitor';

describe('API Connection Monitor Health Orchestration', () => {
  let healthCheckAdapter: InMemoryHealthCheckAdapter;
  let eventPublisher: InMemoryEventPublisher;
  let apiConnectionMonitor: ApiConnectionMonitor;

  beforeAll(() => {
    // TODO: Initialize In-Memory health check adapter and event publisher
    // healthCheckAdapter = new InMemoryHealthCheckAdapter();
    // eventPublisher = new InMemoryEventPublisher();
    // apiConnectionMonitor = new ApiConnectionMonitor('/health');
  });

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

  describe('PerformHealthCheck - Success Path', () => {
    it('should perform successful health check and record metrics', async () => {
      // TODO: Implement test
      // Scenario: API is healthy and responsive
      // Given: HealthCheckAdapter returns successful response
      // And: Response time is 50ms
      // When: performHealthCheck() is called
      // Then: Health check result should show healthy=true
      // And: Response time should be recorded
      // And: EventPublisher should emit HealthCheckCompletedEvent
      // And: Connection status should be 'connected'
    });

    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: performHealthCheck() is called
      // Then: Health check result should show healthy=true
      // And: Response time should be recorded as 500ms
      // And: EventPublisher should emit HealthCheckCompletedEvent
    });

    it('should handle multiple successful health checks', async () => {
      // TODO: Implement test
      // Scenario: Multiple consecutive successful health checks
      // Given: HealthCheckAdapter returns successful responses
      // When: performHealthCheck() is called 3 times
      // Then: All health checks should show healthy=true
      // And: Total requests should be 3
      // And: Successful requests should be 3
      // And: Failed requests should be 0
      // And: Average response time should be calculated
    });
  });

  describe('PerformHealthCheck - Failure Path', () => {
    it('should handle failed health check and record failure', async () => {
      // TODO: Implement test
      // Scenario: API is unreachable
      // Given: HealthCheckAdapter throws network error
      // When: performHealthCheck() is called
      // Then: Health check result should show healthy=false
      // And: EventPublisher should emit HealthCheckFailedEvent
      // And: Connection status should be 'disconnected'
      // And: Consecutive failures should be 1
    });

    it('should handle multiple consecutive failures', async () => {
      // TODO: Implement test
      // Scenario: API is down for multiple checks
      // Given: HealthCheckAdapter throws errors 3 times
      // When: performHealthCheck() is called 3 times
      // Then: All health checks should show healthy=false
      // And: Total requests should be 3
      // And: Failed requests should be 3
      // And: Consecutive failures should be 3
      // And: Connection status should be 'disconnected'
    });

    it('should handle timeout during health check', async () => {
      // TODO: Implement test
      // Scenario: Health check times out
      // Given: HealthCheckAdapter times out after 30 seconds
      // When: performHealthCheck() is called
      // Then: Health check result should show healthy=false
      // And: EventPublisher should emit HealthCheckTimeoutEvent
      // And: Consecutive failures should increment
    });
  });

  describe('Connection Status Management', () => {
    it('should transition from disconnected to connected after recovery', async () => {
      // TODO: Implement test
      // Scenario: API recovers from outage
      // Given: Initial state is disconnected with 3 consecutive failures
      // And: HealthCheckAdapter starts returning success
      // When: performHealthCheck() is called
      // Then: Connection status should transition to 'connected'
      // And: Consecutive failures should reset to 0
      // And: EventPublisher should emit ConnectedEvent
    });

    it('should degrade status when reliability drops below threshold', async () => {
      // TODO: Implement test
      // Scenario: API has intermittent failures
      // Given: 5 successful requests followed by 3 failures
      // When: performHealthCheck() is called for each
      // Then: Connection status should be 'degraded'
      // And: Reliability should be calculated correctly (5/8 = 62.5%)
    });

    it('should handle checking status when no requests yet', async () => {
      // TODO: Implement test
      // Scenario: Monitor just started
      // Given: No health checks performed yet
      // When: getStatus() is called
      // Then: Status should be 'checking'
      // And: isAvailable() should return false
    });
  });

  describe('Health Metrics Calculation', () => {
    it('should correctly calculate reliability percentage', async () => {
      // TODO: Implement test
      // Scenario: Calculate reliability from mixed results
      // Given: 7 successful requests and 3 failed requests
      // When: getReliability() is called
      // Then: Reliability should be 70%
    });

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

    it('should handle zero requests for reliability calculation', async () => {
      // TODO: Implement test
      // Scenario: No requests made yet
      // Given: No health checks performed
      // When: getReliability() is called
      // Then: Reliability should be 0
    });
  });

  describe('Health Check Endpoint Selection', () => {
    it('should try multiple endpoints when primary fails', async () => {
      // TODO: Implement test
      // Scenario: Primary endpoint fails, fallback succeeds
      // Given: /health endpoint fails
      // And: /api/health endpoint succeeds
      // When: performHealthCheck() is called
      // Then: Should try /health first
      // And: Should fall back to /api/health
      // And: Health check should be successful
    });

    it('should handle all endpoints being unavailable', async () => {
      // TODO: Implement test
      // Scenario: All health endpoints are down
      // Given: /health, /api/health, and /status all fail
      // When: performHealthCheck() is called
      // Then: Health check should show healthy=false
      // And: Should record failure for all attempted endpoints
    });
  });

  describe('Event Emission Patterns', () => {
    it('should emit connected event when transitioning to connected', async () => {
      // TODO: Implement test
      // Scenario: Successful health check after disconnection
      // Given: Current status is disconnected
      // And: HealthCheckAdapter returns success
      // When: performHealthCheck() is called
      // Then: EventPublisher should emit ConnectedEvent
      // And: Event should include timestamp and response time
    });

    it('should emit disconnected event when threshold exceeded', async () => {
      // TODO: Implement test
      // Scenario: Consecutive failures reach threshold
      // Given: 2 consecutive failures
      // And: Third failure occurs
      // When: performHealthCheck() is called
      // Then: EventPublisher should emit DisconnectedEvent
      // And: Event should include failure count
    });

    it('should emit degraded event when reliability drops', async () => {
      // TODO: Implement test
      // Scenario: Reliability drops below threshold
      // Given: 5 successful, 3 failed requests (62.5% reliability)
      // When: performHealthCheck() is called
      // Then: EventPublisher should emit DegradedEvent
      // And: Event should include current reliability percentage
    });
  });

  describe('Error Handling', () => {
    it('should handle network errors gracefully', async () => {
      // TODO: Implement test
      // Scenario: Network error during health check
      // Given: HealthCheckAdapter throws ECONNREFUSED
      // When: performHealthCheck() is called
      // Then: Should not throw unhandled error
      // And: Should record failure
      // And: Should maintain connection status
    });

    it('should handle malformed response from health endpoint', async () => {
      // TODO: Implement test
      // Scenario: Health endpoint returns invalid JSON
      // Given: HealthCheckAdapter returns malformed response
      // When: performHealthCheck() is called
      // Then: Should handle parsing error
      // And: Should record as failed check
      // And: Should emit appropriate error event
    });

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