import { describe, it, expect, vi, Mocked } from 'vitest';
import { MembershipFeeService, GetMembershipFeesOutputDto } from './MembershipFeeService';
import { PaymentsApiClient } from '../../api/payments/PaymentsApiClient';
import { MembershipFeeViewModel } from '../../view-models';
import type { MembershipFeeDto } from '../../types/generated';

describe('MembershipFeeService', () => {
  let mockApiClient: Mocked<PaymentsApiClient>;
  let service: MembershipFeeService;

  beforeEach(() => {
    mockApiClient = {
      getMembershipFees: vi.fn(),
    } as Mocked<PaymentsApiClient>;

    service = new MembershipFeeService(mockApiClient);
  });

  describe('getMembershipFees', () => {
    it('should call apiClient.getMembershipFees with correct leagueId and return mapped view models', async () => {
      const leagueId = 'league-123';
      const mockFees: MembershipFeeDto[] = [
        { id: 'fee-1', leagueId: 'league-123' },
        { id: 'fee-2', leagueId: 'league-123' },
      ];
      const mockOutput: GetMembershipFeesOutputDto = { fees: mockFees };
      mockApiClient.getMembershipFees.mockResolvedValue(mockOutput);

      const result = await service.getMembershipFees(leagueId);

      expect(mockApiClient.getMembershipFees).toHaveBeenCalledWith(leagueId);
      expect(result).toHaveLength(2);
      expect(result[0]).toBeInstanceOf(MembershipFeeViewModel);
      expect(result[0].id).toEqual('fee-1');
      expect(result[0].leagueId).toEqual('league-123');
      expect(result[1]).toBeInstanceOf(MembershipFeeViewModel);
      expect(result[1].id).toEqual('fee-2');
      expect(result[1].leagueId).toEqual('league-123');
    });

    it('should return empty array when no fees are returned', async () => {
      const leagueId = 'league-456';
      const mockOutput: GetMembershipFeesOutputDto = { fees: [] };
      mockApiClient.getMembershipFees.mockResolvedValue(mockOutput);

      const result = await service.getMembershipFees(leagueId);

      expect(mockApiClient.getMembershipFees).toHaveBeenCalledWith(leagueId);
      expect(result).toEqual([]);
    });
  });
});