import { describe, it, expect, vi, beforeEach } from 'vitest';
import { CompleteOnboardingMutation } from './CompleteOnboardingMutation';
import { OnboardingService } from '@/lib/services/onboarding/OnboardingService';
import { Result } from '@/lib/contracts/Result';

// Mock dependencies
vi.mock('@/lib/services/onboarding/OnboardingService', () => {
  return {
    OnboardingService: vi.fn(),
  };
});

describe('CompleteOnboardingMutation', () => {
  let mutation: CompleteOnboardingMutation;
  let mockServiceInstance: any;

  beforeEach(() => {
    vi.clearAllMocks();
    mockServiceInstance = {
      completeOnboarding: vi.fn(),
    };
    // Use mockImplementation to return the instance
    (OnboardingService as any).mockImplementation(function() {
      return mockServiceInstance;
    });
    mutation = new CompleteOnboardingMutation();
  });

  describe('execute', () => {
    describe('happy paths', () => {
      it('should successfully complete onboarding with valid input', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
          timezone: 'America/New_York',
          bio: 'Test bio',
        };
        const mockResult = { success: true };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.ok(mockResult));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isOk()).toBe(true);
        expect(result.unwrap()).toBeUndefined();
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledWith(command);
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });

      it('should successfully complete onboarding with minimal input', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const mockResult = { success: true };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.ok(mockResult));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isOk()).toBe(true);
        expect(result.unwrap()).toBeUndefined();
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledWith({
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
          timezone: undefined,
          bio: undefined,
        });
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });
    });

    describe('failure modes', () => {
      it('should handle service failure during onboarding completion', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const serviceError = new Error('Service error');
        mockServiceInstance.completeOnboarding.mockRejectedValue(serviceError);

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isErr()).toBe(true);
        expect(result.getError()).toBe('onboardingFailed');
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });

      it('should handle service returning error result', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const domainError = { type: 'serverError', message: 'Database connection failed' };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.err(domainError));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isErr()).toBe(true);
        expect(result.getError()).toBe('onboardingFailed');
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });

      it('should handle service returning validation error', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const domainError = { type: 'validationError', message: 'Display name taken' };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.err(domainError));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isErr()).toBe(true);
        expect(result.getError()).toBe('onboardingFailed');
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });

      it('should handle service returning notFound error', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const domainError = { type: 'notFound', message: 'User not found' };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.err(domainError));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isErr()).toBe(true);
        expect(result.getError()).toBe('onboardingFailed');
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });
    });

    describe('error mapping', () => {
      it('should map various domain errors to mutation errors', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const testCases = [
          { domainError: { type: 'notFound' }, expectedError: 'onboardingFailed' },
          { domainError: { type: 'unauthorized' }, expectedError: 'onboardingFailed' },
          { domainError: { type: 'validationError' }, expectedError: 'onboardingFailed' },
          { domainError: { type: 'serverError' }, expectedError: 'onboardingFailed' },
          { domainError: { type: 'networkError' }, expectedError: 'onboardingFailed' },
          { domainError: { type: 'notImplemented' }, expectedError: 'onboardingFailed' },
          { domainError: { type: 'unknown' }, expectedError: 'onboardingFailed' },
        ];

        for (const testCase of testCases) {
          mockServiceInstance.completeOnboarding.mockResolvedValue(Result.err(testCase.domainError));

          const result = await mutation.execute(command);

          expect(result.isErr()).toBe(true);
          expect(result.getError()).toBe(testCase.expectedError);
        }
      });
    });

    describe('input validation', () => {
      it('should accept valid input', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const mockResult = { success: true };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.ok(mockResult));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isOk()).toBe(true);
        expect(mockServiceInstance.completeOnboarding).toHaveBeenCalledTimes(1);
      });
    });

    describe('service instantiation', () => {
      it('should create OnboardingService instance', () => {
        // Arrange & Act
        const mutation = new CompleteOnboardingMutation();

        // Assert
        expect(mutation).toBeInstanceOf(CompleteOnboardingMutation);
      });
    });

    describe('result shape', () => {
      it('should return void on success', async () => {
        // Arrange
        const command = {
          firstName: 'John',
          lastName: 'Doe',
          displayName: 'johndoe',
          country: 'US',
        };
        const mockResult = { success: true };
        mockServiceInstance.completeOnboarding.mockResolvedValue(Result.ok(mockResult));

        // Act
        const result = await mutation.execute(command);

        // Assert
        expect(result.isOk()).toBe(true);
        expect(result.unwrap()).toBeUndefined();
      });
    });
  });
});