import { describe, it, expect, vi, beforeEach } from 'vitest';
import { AcceptSponsorshipRequestMutation } from './AcceptSponsorshipRequestMutation';
import { SponsorshipRequestsService } from '@/lib/services/sponsors/SponsorshipRequestsService';
import { Result } from '@/lib/contracts/Result';

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

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

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

  describe('execute', () => {
    describe('happy paths', () => {
      it('should successfully accept sponsorship request with valid input', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.ok(undefined));

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

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

    describe('failure modes', () => {
      it('should handle service failure during acceptance', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        const serviceError = new Error('Service error');
        mockServiceInstance.acceptRequest.mockRejectedValue(serviceError);

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

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

      it('should handle service returning error result', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        const domainError = { type: 'serverError', message: 'Database connection failed' };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.err(domainError));

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

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

      it('should handle service returning validation error', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        const domainError = { type: 'validationError', message: 'Invalid request ID' };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.err(domainError));

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

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

      it('should handle service returning notFound error', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        const domainError = { type: 'notFound', message: 'Sponsorship request not found' };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.err(domainError));

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

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

      it('should handle service returning unauthorized error', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        const domainError = { type: 'unauthorized', message: 'Insufficient permissions' };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.err(domainError));

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

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

    describe('error mapping', () => {
      it('should map various domain errors to mutation errors', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        const testCases = [
          { domainError: { type: 'notFound' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
          { domainError: { type: 'unauthorized' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
          { domainError: { type: 'validationError' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
          { domainError: { type: 'serverError' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
          { domainError: { type: 'networkError' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
          { domainError: { type: 'notImplemented' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
          { domainError: { type: 'unknown' }, expectedError: 'ACCEPT_SPONSORSHIP_REQUEST_FAILED' },
        ];

        for (const testCase of testCases) {
          mockServiceInstance.acceptRequest.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 command input', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.ok(undefined));

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

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

      it('should handle empty requestId gracefully', async () => {
        // Arrange
        const command = {
          requestId: '',
          actorDriverId: 'driver-456',
        };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.ok(undefined));

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

        // Assert
        expect(result.isOk()).toBe(true);
        expect(mockServiceInstance.acceptRequest).toHaveBeenCalledWith(command);
      });

      it('should handle empty actorDriverId gracefully', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: '',
        };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.ok(undefined));

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

        // Assert
        expect(result.isOk()).toBe(true);
        expect(mockServiceInstance.acceptRequest).toHaveBeenCalledWith(command);
      });
    });

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

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

    describe('result shape', () => {
      it('should return void on success', async () => {
        // Arrange
        const command = {
          requestId: 'request-123',
          actorDriverId: 'driver-456',
        };
        mockServiceInstance.acceptRequest.mockResolvedValue(Result.ok(undefined));

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

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