Merge branch 'main' of https://github.com/Poomipat-Ch/taobin_recipe_manager

client/src/app/core/services/department.service.ts

@@ -0,0 +1,26 @@
+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import {
+  BehaviorSubject, lastValueFrom, Observable,
+} from 'rxjs';
+import {environment} from "../../../environments/environment";
+@Injectable({ providedIn: 'root' })
+export class DepartmentService {
+  private departmentSubject = new BehaviorSubject<string | null>(null);
+
+  constructor(private readonly http: HttpClient) {}
+
+  private _getDepartment(): Observable<{result: string[]}> {
+    return this.http.get<{result: string[]}>(environment.api + "/departments", {
+      withCredentials: true,
+    })
+  }
+
+  async fetchDepartment() : Promise<string[]> {
+    return lastValueFrom(this._getDepartment()).then(({result}) => result).catch(err => {throw err})
+  }
+
+  get currentDepartment(): string | null {
+    return this.departmentSubject.value
+  }
+}