added login and register methods to AccountService

src/app/account/account.service.ts

@@ -1,17 +1,38 @@
 import { Injectable } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
+import { BehaviorSubject, Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+import { environment } from '../../environments/environment';
+import { User } from './user';
 
 @Injectable({
   providedIn: 'root'
 })
 export class AccountService {
+  private userSubject: BehaviorSubject<User>;
+  public user: Observable<User>;
 
-  userName: string = null;
+  constructor(private httpClient: HttpClient) {
+    this.userSubject = new BehaviorSubject<User>(JSON.parse(localStorage.getItem('user')));
+    this.user = this.userSubject.asObservable();
+  }
 
-  constructor(private httpClient: HttpClient) { }
+  public get userValue() {
+    return this.userSubject.value;
+  }
 
   login(username, password) {
-    return this.httpClient.post<User>
+    return this.httpClient.post<User>(environment.apiUrl + '/fake_login', { username, password })
+      .pipe((map(user => {
+        localStorage.setItem('user', JSON.stringify(user));
+        this.userSubject.next(user);
+        return user;
+      })))
+  }
+
+  register(user) {
+    return this.httpClient.post<User>(environment.apiUrl + '/fake_registration', user);
   }
 
 }