added a service for create appointment

src/routes/appointments.router.ts

@@ -1,6 +1,7 @@
 import { Router } from 'express';
-import { startOfHour, parseISO } from 'date-fns';
+import { parseISO } from 'date-fns';
 import AppointmentsRepository from '../repositories/AppointmentsRepository';
+import CreateAppointmentService from '../services/CreateAppointmentService';
 
 const router = Router();
 
@@ -13,20 +14,21 @@ router.get('/', (request, response) => {
 router.post('/', (request, response) => {
   const { provider, date } = request.body;
 
-  const parsedDate = startOfHour(parseISO(date));
+  try {
+    const parsedDate = parseISO(date);
 
-  if (appointmentsRepository.findByDate(parsedDate)) {
-    return response
-      .status(400)
-      .json({ message: 'This date is already booked.' });
-  }
-
-  const appointment = appointmentsRepository.create({
-    provider,
-    date: parsedDate,
-  });
+    const createAppointment = new CreateAppointmentService(
+      appointmentsRepository,
+    );
+    const appointment = createAppointment.execute({
+      provider,
+      date: parsedDate,
+    });
 
-  return response.json(appointment);
+    return response.json(appointment);
+  } catch (err) {
+    return response.status(400).json({ error: err.message });
+  }
 });
 
 export default router;

src/services/CreateAppointmentService.ts

@@ -0,0 +1,40 @@
+import { startOfHour } from 'date-fns';
+import AppointmentsRepository from '../repositories/AppointmentsRepository';
+import Appointment from '../models/Appointment';
+
+interface CreateAppointmentServiceInterface {
+  provider: string;
+
+  date: Date;
+}
+
+class CreateAppointmentService {
+  private appointmentsRepository: AppointmentsRepository;
+
+  constructor(appointmentRepository: AppointmentsRepository) {
+    this.appointmentsRepository = appointmentRepository;
+  }
+
+  public execute({
+    provider,
+    date,
+  }: CreateAppointmentServiceInterface): Appointment {
+    const appointmentDate = startOfHour(date);
+
+    if (this.appointmentsRepository.findByDate(appointmentDate)) {
+      throw Error('This date is already booked.');
+      // return response
+      //   .status(400)
+      //   .json({ message: 'This date is already booked.' });
+    }
+
+    const appointment = this.appointmentsRepository.create({
+      provider,
+      date: appointmentDate,
+    });
+
+    return appointment;
+  }
+}
+
+export default CreateAppointmentService;