/**
 * @fileoverview Tests for API and network error handling
 * Tests network failures, API errors, timeout scenarios, and resilience patterns
 */

import { describe, test, expect, beforeEach, afterEach } from '@jest/globals';
import { mockFactory } from '../mocks/mockFactory.js';

describe('API and Network Error Handling Tests', () => {
  let mockEnv;
  let toolGenerator;

  beforeEach(() => {
    mockEnv = mockFactory.createMockEnvironment({
      authTypes: ['provider', 'patient'],
      enableHttpMocks: true,
      enableAuthMocks: true
    });

    toolGenerator = mockEnv.toolGenerator;
    
    // Setup authentication
    mockFactory.authMocks.setMockCredentials('provider', {
      username: 'test_provider',
      password: 'test_password'
    });
  });

  afterEach(() => {
    mockFactory.resetAllMocks();
  });

  describe('Network Connectivity Issues', () => {
    test('should handle network timeout errors', async () => {
      const toolName = 'provider_create_getPatientInfo';
      const parameters = {
        patientId: 123
      };

      // Mock network timeout
      mockFactory.httpMocks.mockRequest('POST', '/api/get-patient-info/123', null, true, {
        code: 'ECONNABORTED',
        message: 'timeout of 5000ms exceeded',
        config: {
          timeout: 5000,
          url: '/api/get-patient-info/123',
          method: 'post'
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected timeout error');
      } catch (error) {
        expect(error.code).toBe('ECONNABORTED');
        expect(error.message).toContain('timeout');
      }
    });

    test('should handle connection refused errors', async () => {
      const toolName = 'provider_create_emrregisterPatient';
      const parameters = {
        firstName: 'John',
        lastName: 'Doe',
        email: 'john@test.com',
        dateOfBirth: '1990-01-01'
      };

      // Mock connection refused
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/register-patients', null, true, {
        code: 'ECONNREFUSED',
        message: 'connect ECONNREFUSED 127.0.0.1:80',
        errno: -61,
        syscall: 'connect',
        address: '127.0.0.1',
        port: 80
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected connection refused error');
      } catch (error) {
        expect(error.code).toBe('ECONNREFUSED');
        expect(error.message).toContain('ECONNREFUSED');
      }
    });

    test('should handle DNS resolution failures', async () => {
      const toolName = 'provider_create_addVital';
      const parameters = {
        patientId: 123,
        provider_id: 456,
        blood_presssure: '120/80'
      };

      // Mock DNS failure
      mockFactory.httpMocks.mockRequest('POST', '/api/add-vital/123', null, true, {
        code: 'ENOTFOUND',
        message: 'getaddrinfo ENOTFOUND api.healthcare.com',
        errno: -3008,
        syscall: 'getaddrinfo',
        hostname: 'api.healthcare.com'
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected DNS error');
      } catch (error) {
        expect(error.code).toBe('ENOTFOUND');
        expect(error.message).toContain('ENOTFOUND');
      }
    });

    test('should handle SSL/TLS certificate errors', async () => {
      const toolName = 'provider_create_prescriptionstore';
      const parameters = {
        patient_id: 'patient_123',
        medication_data: {
          medication_name: 'Lisinopril',
          strength: '10mg'
        }
      };

      // Mock SSL certificate error
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/prescription/store/patient_123', null, true, {
        code: 'CERT_UNTRUSTED',
        message: 'certificate verify failed: self signed certificate',
        errno: -67,
        syscall: 'connect'
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected SSL certificate error');
      } catch (error) {
        expect(error.code).toBe('CERT_UNTRUSTED');
        expect(error.message).toContain('certificate verify failed');
      }
    });
  });

  describe('HTTP Status Code Errors', () => {
    test('should handle 400 Bad Request errors', async () => {
      const toolName = 'provider_create_emrregisterPatient';
      const parameters = {
        firstName: 'John',
        lastName: 'Doe',
        email: 'invalid-email', // Invalid email format
        dateOfBirth: '1990-01-01'
      };

      // Mock bad request
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/register-patients', null, true, {
        response: {
          status: 400,
          data: {
            error: 'Bad Request',
            error_code: 'VALIDATION_ERROR',
            message: 'Request validation failed',
            validation_errors: [
              {
                field: 'email',
                message: 'Invalid email format',
                code: 'INVALID_EMAIL'
              }
            ],
            request_id: 'req_123'
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected bad request error');
      } catch (error) {
        expect(error.response.status).toBe(400);
        expect(error.response.data.error_code).toBe('VALIDATION_ERROR');
        expect(error.response.data.validation_errors[0].field).toBe('email');
      }
    });

    test('should handle 404 Not Found errors', async () => {
      const toolName = 'provider_create_getPatientInfo';
      const parameters = {
        patientId: 999999 // Non-existent patient
      };

      // Mock not found
      mockFactory.httpMocks.mockRequest('POST', '/api/get-patient-info/999999', null, true, {
        response: {
          status: 404,
          data: {
            error: 'Not Found',
            error_code: 'PATIENT_NOT_FOUND',
            message: 'Patient with ID 999999 not found',
            resource_type: 'patient',
            resource_id: 999999,
            suggestions: [
              'Verify patient ID is correct',
              'Check if patient exists in system',
              'Contact system administrator'
            ]
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected not found error');
      } catch (error) {
        expect(error.response.status).toBe(404);
        expect(error.response.data.error_code).toBe('PATIENT_NOT_FOUND');
        expect(error.response.data.suggestions).toContain('Verify patient ID is correct');
      }
    });

    test('should handle 409 Conflict errors', async () => {
      const toolName = 'provider_create_emrregisterPatient';
      const parameters = {
        firstName: 'John',
        lastName: 'Doe',
        email: 'existing@test.com', // Email already exists
        dateOfBirth: '1990-01-01'
      };

      // Mock conflict
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/register-patients', null, true, {
        response: {
          status: 409,
          data: {
            error: 'Conflict',
            error_code: 'PATIENT_ALREADY_EXISTS',
            message: 'Patient with email existing@test.com already exists',
            conflicting_resource: {
              type: 'patient',
              id: 'patient_456',
              email: 'existing@test.com'
            },
            resolution_options: [
              'use_existing_patient',
              'update_existing_patient',
              'use_different_email'
            ]
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected conflict error');
      } catch (error) {
        expect(error.response.status).toBe(409);
        expect(error.response.data.error_code).toBe('PATIENT_ALREADY_EXISTS');
        expect(error.response.data.resolution_options).toContain('use_existing_patient');
      }
    });

    test('should handle 422 Unprocessable Entity errors', async () => {
      const toolName = 'provider_create_addVital';
      const parameters = {
        patientId: 123,
        provider_id: 456,
        blood_presssure: '300/200', // Invalid vital signs
        temperature: 150 // Invalid temperature
      };

      // Mock unprocessable entity
      mockFactory.httpMocks.mockRequest('POST', '/api/add-vital/123', null, true, {
        response: {
          status: 422,
          data: {
            error: 'Unprocessable Entity',
            error_code: 'INVALID_VITAL_SIGNS',
            message: 'Vital signs values are outside acceptable ranges',
            validation_errors: [
              {
                field: 'blood_presssure',
                value: '300/200',
                message: 'Blood pressure values are dangerously high',
                acceptable_range: '80/50 - 200/120'
              },
              {
                field: 'temperature',
                value: 150,
                message: 'Temperature value is not physiologically possible',
                acceptable_range: '95.0 - 110.0 °F'
              }
            ],
            clinical_review_required: true
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected unprocessable entity error');
      } catch (error) {
        expect(error.response.status).toBe(422);
        expect(error.response.data.error_code).toBe('INVALID_VITAL_SIGNS');
        expect(error.response.data.clinical_review_required).toBe(true);
      }
    });

    test('should handle 500 Internal Server Error', async () => {
      const toolName = 'provider_create_medicalRecordscreate';
      const parameters = {
        patient_id: 'patient_123',
        record_type: 'progress_note',
        diagnosis: 'Test diagnosis'
      };

      // Mock internal server error
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/medical-records/create', null, true, {
        response: {
          status: 500,
          data: {
            error: 'Internal Server Error',
            error_code: 'SERVER_ERROR',
            message: 'An unexpected error occurred while processing your request',
            incident_id: 'INC_001',
            timestamp: new Date().toISOString(),
            support_contact: 'support@healthcare.com',
            retry_recommended: true,
            retry_after: 300 // 5 minutes
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected internal server error');
      } catch (error) {
        expect(error.response.status).toBe(500);
        expect(error.response.data.error_code).toBe('SERVER_ERROR');
        expect(error.response.data.retry_recommended).toBe(true);
        expect(error.response.data.incident_id).toBe('INC_001');
      }
    });

    test('should handle 502 Bad Gateway errors', async () => {
      const toolName = 'provider_create_labscreate';
      const parameters = {
        lab_data: {
          test_type: 'CBC',
          patient_id: 'patient_123'
        }
      };

      // Mock bad gateway
      mockFactory.httpMocks.mockRequest('POST', '/api/labs/create', null, true, {
        response: {
          status: 502,
          data: {
            error: 'Bad Gateway',
            error_code: 'UPSTREAM_SERVICE_ERROR',
            message: 'Lab service is temporarily unavailable',
            upstream_service: 'lab_integration_service',
            service_status: 'degraded',
            estimated_recovery: '15 minutes',
            alternative_actions: [
              'retry_later',
              'use_manual_lab_order',
              'contact_lab_directly'
            ]
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected bad gateway error');
      } catch (error) {
        expect(error.response.status).toBe(502);
        expect(error.response.data.error_code).toBe('UPSTREAM_SERVICE_ERROR');
        expect(error.response.data.alternative_actions).toContain('retry_later');
      }
    });

    test('should handle 503 Service Unavailable errors', async () => {
      const toolName = 'provider_create_emrcreateAppointment';
      const parameters = {
        patient_id: 'patient_123',
        practitioner_id: 'provider_456',
        appointment_date: '2025-07-15',
        appointment_time: '10:00'
      };

      // Mock service unavailable
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/create-appointment', null, true, {
        response: {
          status: 503,
          data: {
            error: 'Service Unavailable',
            error_code: 'MAINTENANCE_MODE',
            message: 'System is temporarily unavailable for scheduled maintenance',
            maintenance_window: {
              start: '2025-07-09T02:00:00Z',
              end: '2025-07-09T04:00:00Z',
              duration: '2 hours'
            },
            retry_after: 7200, // 2 hours
            emergency_contact: 'emergency@healthcare.com',
            status_page: 'https://status.healthcare.com'
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected service unavailable error');
      } catch (error) {
        expect(error.response.status).toBe(503);
        expect(error.response.data.error_code).toBe('MAINTENANCE_MODE');
        expect(error.response.data.retry_after).toBe(7200);
        expect(error.response.data.emergency_contact).toBeDefined();
      }
    });
  });

  describe('Data Validation and Format Errors', () => {
    test('should handle malformed JSON responses', async () => {
      const toolName = 'provider_create_getPatientInfo';
      const parameters = {
        patientId: 123
      };

      // Mock malformed JSON
      mockFactory.httpMocks.mockRequest('POST', '/api/get-patient-info/123', {
        status: 200,
        data: 'invalid json response {malformed'
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected JSON parse error');
      } catch (error) {
        expect(error.message).toContain('JSON');
      }
    });

    test('should handle missing required response fields', async () => {
      const toolName = 'provider_create_emrregisterPatient';
      const parameters = {
        firstName: 'John',
        lastName: 'Doe',
        email: 'john@test.com',
        dateOfBirth: '1990-01-01'
      };

      // Mock incomplete response
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/register-patients', {
        status: 201,
        data: {
          // Missing success field and patient data
          message: 'Patient registered'
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected incomplete response error');
      } catch (error) {
        expect(error.message).toContain('incomplete');
      }
    });

    test('should handle unexpected response structure', async () => {
      const toolName = 'provider_create_addVital';
      const parameters = {
        patientId: 123,
        provider_id: 456,
        blood_presssure: '120/80'
      };

      // Mock unexpected response structure
      mockFactory.httpMocks.mockRequest('POST', '/api/add-vital/123', {
        status: 200,
        data: {
          unexpected_field: 'value',
          different_structure: true
          // Missing expected fields
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected unexpected response error');
      } catch (error) {
        expect(error.message).toContain('unexpected');
      }
    });
  });

  describe('Retry and Resilience Patterns', () => {
    test('should implement exponential backoff for retries', async () => {
      const toolName = 'provider_create_getPatientInfo';
      const parameters = {
        patientId: 123
      };

      // Mock temporary failure followed by success
      let attemptCount = 0;
      mockFactory.httpMocks.mockRequest('POST', '/api/get-patient-info/123', () => {
        attemptCount++;
        if (attemptCount < 3) {
          throw {
            response: {
              status: 503,
              data: { error: 'Service temporarily unavailable' }
            }
          };
        }
        return {
          status: 200,
          data: {
            success: true,
            patient: mockFactory.healthcareMocks.createHIPAACompliantData('patient', 'provider')
          }
        };
      });

      const result = await toolGenerator.executeTool(toolName, parameters);
      
      expect(result.success).toBe(true);
      expect(attemptCount).toBe(3); // Should have retried twice before success
    });

    test('should handle circuit breaker pattern', async () => {
      const toolName = 'provider_create_labscreate';
      const parameters = {
        lab_data: {
          test_type: 'CBC',
          patient_id: 'patient_123'
        }
      };

      // Mock circuit breaker open
      mockFactory.httpMocks.mockRequest('POST', '/api/labs/create', null, true, {
        response: {
          status: 503,
          data: {
            error: 'Circuit breaker open',
            error_code: 'CIRCUIT_BREAKER_OPEN',
            message: 'Lab service circuit breaker is open due to repeated failures',
            circuit_state: 'open',
            failure_count: 10,
            failure_threshold: 5,
            next_attempt_allowed: new Date(Date.now() + 300000).toISOString(), // 5 minutes
            fallback_available: true,
            fallback_action: 'manual_lab_order'
          }
        }
      });

      try {
        await toolGenerator.executeTool(toolName, parameters);
        fail('Expected circuit breaker error');
      } catch (error) {
        expect(error.response.status).toBe(503);
        expect(error.response.data.error_code).toBe('CIRCUIT_BREAKER_OPEN');
        expect(error.response.data.fallback_available).toBe(true);
      }
    });

    test('should handle graceful degradation', async () => {
      const toolName = 'provider_create_emrcreateAppointment';
      const parameters = {
        patient_id: 'patient_123',
        practitioner_id: 'provider_456',
        appointment_date: '2025-07-15',
        appointment_time: '10:00'
      };

      // Mock degraded service response
      mockFactory.httpMocks.mockRequest('POST', '/api/emr/create-appointment', {
        status: 200,
        data: {
          success: true,
          appointment: mockFactory.healthcareMocks.generateMockAppointment(),
          service_status: 'degraded',
          degraded_features: [
            'email_notifications',
            'calendar_sync',
            'reminder_service'
          ],
          available_features: [
            'appointment_creation',
            'basic_scheduling',
            'patient_notification'
          ],
          estimated_full_service_restoration: '2025-07-09T16:00:00Z'
        }
      });

      const result = await toolGenerator.executeTool(toolName, parameters);
      
      expect(result.success).toBe(true);
      expect(result.data.service_status).toBe('degraded');
      expect(result.data.degraded_features).toContain('email_notifications');
      expect(result.data.available_features).toContain('appointment_creation');
    });
  });
});