refactor: move contact servicesto services folder

src/app/services/contact.service.ts

@@ -0,0 +1,47 @@
+import { HttpClient } from '@angular/common/http';
+import { inject, Injectable } from '@angular/core';
+import { environment } from '../../environments/environment';
+import { ContactDTO } from '../models/ContactDTO';
+import { Response } from '../models/Response';
+import { BehaviorSubject, map, switchMap, tap } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class ContactService {
+  private readonly httpClient = inject(HttpClient);
+  private readonly contacts = new BehaviorSubject<ContactDTO[]>([]);
+  readonly contacts$ = this.contacts.asObservable();
+
+  delete(id: number) {
+    return this.httpClient
+      .delete<Response<string>>(`${environment.apiUrl}/contacts/${id}`)
+      .pipe(switchMap(() => this.getAll()));
+  }
+
+  findById(id: string) {
+    return this.httpClient.get<Response<ContactDTO | null>>(`${environment.apiUrl}/contacts/${id}`);
+  }
+
+  getAll() {
+    return this.httpClient
+      .get<Response<ContactDTO[] | null>>(environment.apiUrl + '/contacts')
+      .pipe(
+        map((response) => response.data ?? []),
+        tap((contacts) => this.contacts.next(contacts))
+      );
+  }
+
+  save(contact: ContactDTO) {
+    return this.httpClient
+      .post<Response<ContactDTO[] | null>>(environment.apiUrl + '/contacts', contact)
+      .pipe(switchMap(() => this.getAll()));
+  }
+
+  update(contact: ContactDTO) {
+    return this.httpClient.put<Response<ContactDTO[] | null>>(
+      `${environment.apiUrl}/contacts/${contact.id}`,
+      contact
+    );
+  }
+}