feat(challenge 7): begin ngrx notification work

apps/ngrx-notification/src/app/app.component.ts

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+import { Component } from '@angular/core';
+import { StudentComponent } from './student.component';
+import { TeacherComponent } from './teacher.component';
+
+@Component({
+  standalone: true,
+  imports: [TeacherComponent, StudentComponent],
+  selector: 'app-root',
+  template: `
+    <teacher></teacher>
+    <student></student>
+  `,
+  styles: [
+    `
+      :host {
+        display: flex;
+        gap: 20px;
+      }
+    `,
+  ],
+})
+export class AppComponent {}

apps/ngrx-notification/src/app/backend/push.service.ts

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+import { Injectable } from '@angular/core';
+import { BehaviorSubject, tap, timer } from 'rxjs';
+import { randStudent } from '../model/student.model';
+import { randTeacher } from '../model/teacher.model';
+
+@Injectable({ providedIn: 'root' })
+export class PushService {
+  private notificationSubject = new BehaviorSubject<any>(undefined);
+  notification$ = this.notificationSubject.asObservable();
+
+  init() {
+    this.startTeacherNotification();
+    this.startStudentNotification();
+  }
+
+  private startTeacherNotification() {
+    timer(0, 4000)
+      .pipe(tap(() => this.notificationSubject.next(randTeacher())))
+      .subscribe();
+  }
+
+  private startStudentNotification() {
+    timer(1000, 3000)
+      .pipe(tap(() => this.notificationSubject.next(randStudent())))
+      .subscribe();
+  }
+}

apps/ngrx-notification/src/app/data-access/notification.service.ts

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+import { Injectable } from '@angular/core';
+import { filter } from 'rxjs';
+import { PushService } from '../backend/push.service';
+import { Push } from '../model/push.model';
+import { isStudent } from '../model/student.model';
+import { isTeacher } from '../model/teacher.model';
+import { StudentStore } from './student.store';
+import { TeacherStore } from './teacher.store';
+
+@Injectable({ providedIn: 'root' })
+export class NotificationService {
+  constructor(
+    private pushService: PushService,
+    private teacherStore: TeacherStore,
+    private studentStore: StudentStore
+  ) {}
+
+  init() {
+    this.pushService.notification$
+      .pipe(filter(Boolean))
+      .subscribe((notification: Push) => {
+        console.log(notification);
+        if (isTeacher(notification)) {
+          this.teacherStore.addOne(notification);
+        }
+        if (isStudent(notification)) {
+          this.studentStore.addOne(notification);
+        }
+      });
+  }
+}

apps/ngrx-notification/src/app/data-access/student.store.ts

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+import { Injectable } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+import { Student } from '../model/student.model';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class StudentStore {
+  private students = new BehaviorSubject<Student[]>([]);
+  students$ = this.students.asObservable();
+
+  addAll(students: Student[]) {
+    this.students.next(students);
+  }
+
+  addOne(student: Student) {
+    this.students.next([...this.students.value, student]);
+  }
+
+  deleteOne(id: number) {
+    this.students.next(this.students.value.filter((s) => s.id !== id));
+  }
+}

apps/ngrx-notification/src/app/data-access/teacher.store.ts

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+import { Injectable } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+import { Teacher } from '../model/teacher.model';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class TeacherStore {
+  private teachers = new BehaviorSubject<Teacher[]>([]);
+  teachers$ = this.teachers.asObservable();
+
+  addAll(teachers: Teacher[]) {
+    this.teachers.next(teachers);
+  }
+
+  addOne(teacher: Teacher) {
+    this.teachers.next([...this.teachers.value, teacher]);
+  }
+
+  deleteOne(id: number) {
+    this.teachers.next(this.teachers.value.filter((t) => t.id !== id));
+  }
+}

apps/ngrx-notification/src/app/model/push.model.ts

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+export type PushType = 'teacher' | 'student';
+
+export interface Push {
+  type: PushType;
+}

apps/ngrx-notification/src/app/model/student.model.ts

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+import {
+  incrementalNumber,
+  randFirstName,
+  randLastName,
+  randWord,
+} from '@ngneat/falso';
+import { Push } from './push.model';
+
+export interface Student extends Push {
+  id: number;
+  firstname: string;
+  lastname: string;
+  school: string;
+}
+
+const factoryStudent = incrementalNumber();
+
+export const randStudent = (): Student => ({
+  id: factoryStudent(),
+  firstname: randFirstName(),
+  lastname: randLastName(),
+  school: randWord(),
+  type: 'student',
+});
+
+export const isStudent = (notif: Push): notif is Student => {
+  return notif.type === 'student';
+};

apps/ngrx-notification/src/app/model/teacher.model.ts

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+import {
+  incrementalNumber,
+  rand,
+  randFirstName,
+  randLastName,
+} from '@ngneat/falso';
+import { Push } from './push.model';
+
+export const subject = [
+  'Sciences',
+  'History',
+  'English',
+  'Maths',
+  'Sport',
+] as const;
+export type Subject = typeof subject[number];
+
+export interface Teacher extends Push {
+  id: number;
+  firstname: string;
+  lastname: string;
+  subject: Subject;
+}
+
+const factoryTeacher = incrementalNumber();
+
+export const randTeacher = () => ({
+  id: factoryTeacher(),
+  firstname: randFirstName(),
+  lastname: randLastName(),
+  subject: rand(subject),
+  type: 'teacher',
+});
+
+export const isTeacher = (notif: Push): notif is Teacher => {
+  return notif.type === 'teacher';
+};

apps/ngrx-notification/src/app/student.component.ts

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+/* eslint-disable @angular-eslint/component-selector */
+import { AsyncPipe, NgFor } from '@angular/common';
+import { Component } from '@angular/core';
+import { StudentStore } from './data-access/student.store';
+
+@Component({
+  standalone: true,
+  imports: [NgFor, AsyncPipe],
+  selector: 'student',
+  template: `
+    <h3>STUDENTS</h3>
+    <div *ngFor="let student of students$ | async">
+      {{ student.firstname }}
+    </div>
+  `,
+  styles: [
+    `
+      :host {
+        display: block;
+        width: fit-content;
+        height: fit-content;
+        border: 1px solid red;
+        padding: 4px;
+      }
+    `,
+  ],
+})
+export class StudentComponent {
+  students$ = this.studentStore.students$;
+
+  constructor(private studentStore: StudentStore) {}
+}

apps/ngrx-notification/src/app/teacher.component.ts

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+import { AsyncPipe, NgFor } from '@angular/common';
+import { Component } from '@angular/core';
+import { TeacherStore } from './data-access/teacher.store';
+
+@Component({
+  standalone: true,
+  imports: [NgFor, AsyncPipe],
+  selector: 'teacher',
+  template: `
+    <h3>TEACHERS</h3>
+    <div *ngFor="let teacher of teacher$ | async">
+      {{ teacher.firstname }}
+    </div>
+  `,
+  styles: [
+    `
+      :host {
+        display: block;
+        width: fit-content;
+        height: fit-content;
+        border: 1px solid red;
+        padding: 4px;
+      }
+    `,
+  ],
+})
+export class TeacherComponent {
+  teacher$ = this.teacherStore.teachers$;
+
+  constructor(private teacherStore: TeacherStore) {}
+}