Implement password reset logic

Use angular-flex for form
Implement FormControl and Matcher

src/app/password-reset/password-reset.component.html

-<form>
+<form (ngSubmit)="resetPassword(email.value)" fxLayout="column" fxLayoutAlign="space-around"
+      fxLayoutGap="10px">
   <mat-form-field class="input-block">
-    <input matInput placeholder="E-Mail" />
+    <input matInput #email placeholder="E-Mail" [formControl]="usernameFormControl" [errorStateMatcher]="matcher"
+           name="email"/>
+    <mat-error *ngIf="usernameFormControl.hasError('required')">Email address is <strong>required</strong>.</mat-error>
   </mat-form-field>
 
-  <button mat-raised-button color="primary">Submit</button>
+  <button mat-raised-button color="primary" (click)="resetPassword(email.value)">Reset password</button>
 </form>

src/app/password-reset/password-reset.component.ts

-import { Component, OnInit } from '@angular/core';
+import { Component, Inject, OnInit } from '@angular/core';
+import { FormControl, FormGroupDirective, NgForm, Validators } from '@angular/forms';
+import { ErrorStateMatcher, MAT_DIALOG_DATA, MatDialogRef } from '@angular/material';
+import { AuthenticationService } from '../authentication.service';
+import { NotificationService } from '../notification.service';
+import { RegisterComponent } from '../register/register.component';
+
+export class PasswordResetErrorStateMatcher implements ErrorStateMatcher {
+  isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
+    const isSubmitted = form && form.submitted;
+    return (control && control.invalid && (control.dirty || control.touched || isSubmitted));
+  }
+}
 
 @Component({
   selector: 'app-password-reset',
@@ -7,9 +19,35 @@ import { Component, OnInit } from '@angular/core';
 })
 export class PasswordResetComponent implements OnInit {
 
-  constructor() { }
+
+  usernameFormControl = new FormControl('', [Validators.required, Validators.email]);
+
+  matcher = new PasswordResetErrorStateMatcher();
+
+  constructor(public authenticationService: AuthenticationService,
+              public notificationService: NotificationService,
+              public dialogRef: MatDialogRef<RegisterComponent>,
+              @Inject(MAT_DIALOG_DATA) public data: any) {
+  }
 
   ngOnInit() {
   }
 
+  resetPassword(username: string): void {
+    username = username.trim();
+
+    if (username) {
+      this.authenticationService.resetPassword(username).subscribe(result => {
+        if (result) {
+          this.notificationService.show('Password was reset. Please check your mail!');
+          this.dialogRef.close();
+        } else {
+          this.notificationService.show('Could not reset your password. Is your email address correct?');
+        }
+      });
+    } else {
+      this.notificationService.show('Email address can not be empty.');
+    }
+  }
+
 }