import { CreateContactCommandHandler } from '../../../../src/Application/Contact/commands/CreateContactCommandHandler';
import { UpdateContactCommandHandler } from '../../../../src/Application/Contact/commands/UpdateContactCommandHandler';
import { DeleteContactCommandHandler } from '../../../../src/Application/Contact/commands/DeleteContactCommandHandler';
import { CreateContactCommand } from '../../../../src/Application/Contact/commands/CreateContactCommand';
import { UpdateContactCommand } from '../../../../src/Application/Contact/commands/UpdateContactCommand';
import { DeleteContactCommand } from '../../../../src/Application/Contact/commands/DeleteContactCommand';
import { ContactType, ContactState } from '../../../../src/Domain/Contact/ContactAggregate';
import { createMockContactRepository, createMockContact } from '../../../testUtils';

describe('Contact Command Handlers - Comprehensive', () => {
  let mockContactRepository: ReturnType<typeof createMockContactRepository>;

  beforeEach(() => {
    mockContactRepository = createMockContactRepository();
  });

  describe('CreateContactCommandHandler', () => {
    let handler: CreateContactCommandHandler;

    beforeEach(() => {
      handler = new CreateContactCommandHandler(mockContactRepository);
    });

    it('should create contact successfully with all fields', async () => {
      // Arrange
      const mockContactData = createMockContact({
        id: '550e8400-e29b-41d4-a716-446655440000',
        name: 'John Doe',
        email: 'john@example.com',
        userid: '123e4567-e89b-12d3-a456-426614174000',
        type: ContactType.QUESTION,
        txt: 'Test question',
        state: ContactState.ACTIVE
      });

      mockContactRepository.create.mockResolvedValue(mockContactData);

      const command: CreateContactCommand = {
        name: 'John Doe',
        email: 'john@example.com',
        userid: '123e4567-e89b-12d3-a456-426614174000',
        type: ContactType.QUESTION,
        txt: 'Test question'
      };

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

      // Assert - Returns ShortContactDto
      expect(result).toEqual({
        id: '550e8400-e29b-41d4-a716-446655440000',
        name: 'John Doe',
        email: 'john@example.com',
        type: ContactType.QUESTION,
        state: ContactState.ACTIVE,
        createDate: expect.any(Date)
      });
      expect(mockContactRepository.create).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'John Doe',
          email: 'john@example.com',
          userid: '123e4567-e89b-12d3-a456-426614174000',
          type: ContactType.QUESTION,
          txt: 'Test question',
          state: ContactState.ACTIVE
        })
      );
    });

    it('should create contact without userid (anonymous)', async () => {
      // Arrange
      const mockContactData = createMockContact({
        id: '550e8400-e29b-41d4-a716-446655440001',
        name: 'Anonymous User',
        email: 'anon@example.com',
        userid: null,
        type: ContactType.BUG,
        txt: 'Bug report',
        state: ContactState.ACTIVE
      });

      mockContactRepository.create.mockResolvedValue(mockContactData);

      const command: CreateContactCommand = {
        name: 'Anonymous User',
        email: 'anon@example.com',
        type: ContactType.BUG,
        txt: 'Bug report'
      };

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

      // Assert
      expect(result).toEqual({
        id: '550e8400-e29b-41d4-a716-446655440001',
        name: 'Anonymous User',
        email: 'anon@example.com',
        type: ContactType.BUG,
        state: ContactState.ACTIVE,
        createDate: expect.any(Date)
      });
      expect(mockContactRepository.create).toHaveBeenCalledWith(
        expect.objectContaining({
          userid: null
        })
      );
    });

    it('should create contact with different contact types', async () => {
      const testCases = [
        { type: ContactType.BUG, description: 'Bug report' },
        { type: ContactType.PROBLEM, description: 'Problem report' },
        { type: ContactType.QUESTION, description: 'Question' },
        { type: ContactType.SALES, description: 'Sales inquiry' },
        { type: ContactType.OTHER, description: 'Other inquiry' }
      ];

      for (const testCase of testCases) {
        // Arrange
        const mockContactData = createMockContact({
          type: testCase.type,
          txt: testCase.description
        });

        mockContactRepository.create.mockResolvedValue(mockContactData);

        const command: CreateContactCommand = {
          name: 'Test User',
          email: 'test@example.com',
          type: testCase.type,
          txt: testCase.description
        };

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

        // Assert
        expect(result.type).toBe(testCase.type);
        expect(mockContactRepository.create).toHaveBeenCalledWith(
          expect.objectContaining({
            txt: testCase.description
          })
        );
      }
    });

    it('should handle database errors', async () => {
      // Arrange
      const command: CreateContactCommand = {
        name: 'Error User',
        email: 'error@example.com',
        type: ContactType.QUESTION,
        txt: 'This will cause an error'
      };

      mockContactRepository.create.mockRejectedValue(new Error('Database error'));

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Failed to create contact');
    });

    it('should handle non-Error exceptions', async () => {
      // Arrange
      const command: CreateContactCommand = {
        name: 'Exception User',
        email: 'exception@example.com',
        type: ContactType.QUESTION,
        txt: 'This will cause an exception'
      };

      mockContactRepository.create.mockRejectedValue('String error');

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Failed to create contact');
    });
  });

  describe('UpdateContactCommandHandler', () => {
    let handler: UpdateContactCommandHandler;

    beforeEach(() => {
      handler = new UpdateContactCommandHandler(mockContactRepository);
    });

    it('should update contact with admin response', async () => {
      // Arrange
      const existingContact = createMockContact({
        id: '550e8400-e29b-41d4-a716-446655440000',
        adminResponse: null,
        state: ContactState.ACTIVE
      });

      const updatedContact = createMockContact({
        ...existingContact,
        adminResponse: 'Thank you for your inquiry',
        state: ContactState.RESOLVED,
        responseDate: new Date(),
        respondedBy: 'admin123'
      });

      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.update.mockResolvedValue(updatedContact);

      const command: UpdateContactCommand = {
        id: '550e8400-e29b-41d4-a716-446655440000',
        adminResponse: 'Thank you for your inquiry'
      };

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

      // Assert - Returns DetailContactDto
      expect(result).toEqual({
        id: '550e8400-e29b-41d4-a716-446655440000',
        name: expect.any(String),
        email: expect.any(String),
        userid: expect.any(String),
        type: expect.any(Number),
        txt: expect.any(String),
        state: ContactState.RESOLVED,
        createDate: expect.any(Date),
        updateDate: expect.any(Date),
        adminResponse: 'Thank you for your inquiry',
        responseDate: expect.any(Date),
        respondedBy: 'admin123'
      });
    });

    it('should update contact state', async () => {
      // Arrange
      const existingContact = createMockContact({
        id: '550e8400-e29b-41d4-a716-446655440000',
        state: ContactState.ACTIVE
      });

      const updatedContact = createMockContact({
        ...existingContact,
        state: ContactState.RESOLVED
      });

      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.update.mockResolvedValue(updatedContact);

      const command: UpdateContactCommand = {
        id: '550e8400-e29b-41d4-a716-446655440000',
        state: ContactState.RESOLVED
      };

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

      // Assert
      expect(result.state).toBe(ContactState.RESOLVED);
    });

    it('should throw error when contact not found', async () => {
      // Arrange
      mockContactRepository.findById.mockResolvedValue(null);

      const command: UpdateContactCommand = {
        id: 'non-existent-id',
        adminResponse: 'Response'
      };

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Contact not found');
    });

    it('should handle repository errors during update', async () => {
      // Arrange
      const existingContact = createMockContact();
      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.update.mockRejectedValue(new Error('Database error'));

      const command: UpdateContactCommand = {
        id: 'existing-id',
        adminResponse: 'Response'
      };

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Failed to update contact');
    });
  });

  describe('DeleteContactCommandHandler', () => {
    let handler: DeleteContactCommandHandler;

    beforeEach(() => {
      handler = new DeleteContactCommandHandler(mockContactRepository);
    });

    it('should perform soft delete successfully', async () => {
      // Arrange
      const existingContact = createMockContact({
        id: '550e8400-e29b-41d4-a716-446655440000'
      });

      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.softDelete.mockResolvedValue(null);

      const command: DeleteContactCommand = {
        id: '550e8400-e29b-41d4-a716-446655440000',
        hard: false
      };

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

      // Assert
      expect(result).toBe(true);
      expect(mockContactRepository.findById).toHaveBeenCalledWith('550e8400-e29b-41d4-a716-446655440000');
      expect(mockContactRepository.softDelete).toHaveBeenCalledWith('550e8400-e29b-41d4-a716-446655440000');
      expect(mockContactRepository.delete).not.toHaveBeenCalled();
    });

    it('should perform hard delete successfully', async () => {
      // Arrange
      const existingContact = createMockContact({
        id: '550e8400-e29b-41d4-a716-446655440000'
      });

      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.delete.mockResolvedValue(true);

      const command: DeleteContactCommand = {
        id: '550e8400-e29b-41d4-a716-446655440000',
        hard: true
      };

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

      // Assert
      expect(result).toBe(true);
      expect(mockContactRepository.delete).toHaveBeenCalledWith('550e8400-e29b-41d4-a716-446655440000');
      expect(mockContactRepository.softDelete).not.toHaveBeenCalled();
    });

    it('should default to soft delete when hard flag not specified', async () => {
      // Arrange
      const existingContact = createMockContact();
      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.softDelete.mockResolvedValue(null);

      const command: DeleteContactCommand = {
        id: '550e8400-e29b-41d4-a716-446655440000'
      };

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

      // Assert
      expect(result).toBe(true);
      expect(mockContactRepository.softDelete).toHaveBeenCalled();
      expect(mockContactRepository.delete).not.toHaveBeenCalled();
    });

    it('should throw error when contact not found', async () => {
      // Arrange
      mockContactRepository.findById.mockResolvedValue(null);

      const command: DeleteContactCommand = {
        id: 'non-existent-id',
        hard: false
      };

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Contact not found');
    });

    it('should handle repository errors during deletion', async () => {
      // Arrange
      const existingContact = createMockContact();
      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.softDelete.mockRejectedValue(new Error('Database error'));

      const command: DeleteContactCommand = {
        id: 'existing-id',
        hard: false
      };

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Failed to delete contact');
    });

    it('should handle hard delete repository errors', async () => {
      // Arrange
      const existingContact = createMockContact();
      mockContactRepository.findById.mockResolvedValue(existingContact);
      mockContactRepository.delete.mockRejectedValue(new Error('Database error'));

      const command: DeleteContactCommand = {
        id: 'existing-id',
        hard: true
      };

      // Act & Assert
      await expect(handler.execute(command)).rejects.toThrow('Failed to delete contact');
    });
  });
});