import { AppService } from './app.service';
import { PrismaService } from './prisma/prisma.service';

describe('AppService', () => {
  let service: AppService;
  let prisma: Pick<PrismaService, '$queryRaw'>;

  beforeEach(() => {
    prisma = {
      $queryRaw: jest.fn().mockResolvedValue([{ '?column?': 1 }]),
    } as Pick<PrismaService, '$queryRaw'>;
    service = new AppService(prisma as PrismaService);
  });

  it('returns the root service status', () => {
    expect(service.getRoot()).toEqual({
      service: 'lms-be',
      status: 'ok',
    });
  });

  it('returns a health payload', () => {
    expect(service.getHealth()).toMatchObject({
      status: 'ok',
    });
  });

  it('checks database health', async () => {
    await expect(service.getDatabaseHealth()).resolves.toMatchObject({
      status: 'ok',
      provider: 'postgresql',
    });
    expect(prisma.$queryRaw).toHaveBeenCalled();
  });
});