From 2f280b2b956d0c7d34b8ad335431405d27966022 Mon Sep 17 00:00:00 2001
From: Polianin Nikita <nikitkapolyanin@yandex.ru>
Date: Wed, 13 Mar 2024 04:35:27 +0300
Subject: [PATCH] feat: add a retry button in case of a load error

---
 .../loading-indicator.component.html          |  7 +++++
 .../loading-indicator.component.ts            | 20 +++++++++++++
 .../schedule-tabs-group.component.html        | 16 +++++-----
 .../schedule-tabs-group.component.ts          | 26 ++++++++++-------
 .../schedule-tabs-lecture-hall.component.html |  8 ++---
 .../schedule-tabs-lecture-hall.component.ts   | 14 +++++----
 .../schedule-tabs-other.component.html        | 17 ++++++-----
 .../schedule-tabs-other.component.ts          | 21 ++++++++------
 .../schedule-tabs-professor.component.html    |  8 ++---
 .../schedule-tabs-professor.component.ts      | 29 ++++++++++---------
 10 files changed, 107 insertions(+), 59 deletions(-)
 create mode 100644 src/components/loading-indicator/loading-indicator.component.html
 create mode 100644 src/components/loading-indicator/loading-indicator.component.ts

diff --git a/src/components/loading-indicator/loading-indicator.component.html b/src/components/loading-indicator/loading-indicator.component.html
new file mode 100644
index 0000000..87083ed
--- /dev/null
+++ b/src/components/loading-indicator/loading-indicator.component.html
@@ -0,0 +1,7 @@
+@if (loading) {
+  <app-data-spinner/>
+} @else {
+  <button mat-fab color="primary" (click)="retryFunction.emit()">
+    <mat-icon>refresh</mat-icon>
+  </button>
+}
diff --git a/src/components/loading-indicator/loading-indicator.component.ts b/src/components/loading-indicator/loading-indicator.component.ts
new file mode 100644
index 0000000..8ec20ad
--- /dev/null
+++ b/src/components/loading-indicator/loading-indicator.component.ts
@@ -0,0 +1,20 @@
+import {Component, EventEmitter, Input, Output} from '@angular/core';
+import {DataSpinnerComponent} from "@component/data-spinner/data-spinner.component";
+import {MatIcon} from "@angular/material/icon";
+import {MatButton, MatFabButton} from "@angular/material/button";
+
+@Component({
+  selector: 'app-loading-indicator',
+  standalone: true,
+  imports: [
+    DataSpinnerComponent,
+    MatButton,
+    MatIcon,
+    MatFabButton
+  ],
+  templateUrl: './loading-indicator.component.html'
+})
+export class LoadingIndicatorComponent {
+  @Input() loading: boolean = true;
+  @Output() retryFunction: EventEmitter<void> = new EventEmitter<void>();
+}
diff --git a/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.html b/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.html
index 7149905..c2d88b9 100644
--- a/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.html
+++ b/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.html
@@ -5,30 +5,31 @@
         Факультет
       </mat-panel-title>
     </mat-expansion-panel-header>
-    <mat-chip-listbox hideSingleSelectionIndicator (change)="selectedFaculty($event)">
+    <mat-chip-listbox hideSingleSelectionIndicator (change)="chooseFaculty($event)">
       @for (faculty of faculties | async; track $index) {
         <mat-chip-option [value]="faculty.id" color="accent">
           {{ faculty.name }}
         </mat-chip-option>
       } @empty {
-        <app-data-spinner/>
+        <app-loading-indicator [loading]="facultiesLoaded !== null" (retryFunction)="facultiesLoadRetry.emit()"/>
       }
     </mat-chip-listbox>
   </mat-expansion-panel>
 
-  <mat-expansion-panel [disabled]="facultiesId === null" #courseNumberPanel>
+  <mat-expansion-panel [disabled]="facultyId === null" #courseNumberPanel>
     <mat-expansion-panel-header>
       <mat-panel-title>
         Курс
       </mat-panel-title>
     </mat-expansion-panel-header>
-    <mat-chip-listbox hideSingleSelectionIndicator (change)="selectCourseNumber($event)" [formControl]="chipCourse">
+    <mat-chip-listbox hideSingleSelectionIndicator (change)="chooseCourseNumber($event)" [formControl]="chipCourse">
       @for (course of courseNumbers | async; track $index) {
         <mat-chip-option [value]="course" color="accent">
           {{ course }}
         </mat-chip-option>
       } @empty {
-        <app-data-spinner/>
+        <app-loading-indicator [loading]="groupsLoaded !== null"
+                               (retryFunction)="groupsLoadRetry.emit(this.facultyId!)"/>
       }
     </mat-chip-listbox>
   </mat-expansion-panel>
@@ -39,13 +40,14 @@
         Группа
       </mat-panel-title>
     </mat-expansion-panel-header>
-    <mat-chip-listbox hideSingleSelectionIndicator (change)="selectGroup($event)" [formControl]="chipGroup">
+    <mat-chip-listbox hideSingleSelectionIndicator (change)="chooseGroup($event)" [formControl]="chipGroup">
       @for (group of filteredGroups | async; track $index) {
         <mat-chip-option [value]="group.id" color="accent">
           {{ group.name }}
         </mat-chip-option>
       } @empty {
-        <app-data-spinner/>
+        <app-loading-indicator [loading]="groupsLoaded !== null"
+                               (retryFunction)="groupsLoadRetry.emit(this.facultyId!)"/>
       }
     </mat-chip-listbox>
   </mat-expansion-panel>
diff --git a/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.ts b/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.ts
index 073e08d..6f4508d 100644
--- a/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.ts
+++ b/src/components/schedule-tabs/schedule-tabs-group/schedule-tabs-group.component.ts
@@ -1,29 +1,31 @@
 import {Component, EventEmitter, Input, Output, ViewChild} from '@angular/core';
 import {MatExpansionModule, MatExpansionPanel} from "@angular/material/expansion";
-import {DataSpinnerComponent} from "@component/data-spinner/data-spinner.component";
 import {MatChipListboxChange, MatChipsModule} from '@angular/material/chips';
 import {FormControl, ReactiveFormsModule} from "@angular/forms";
 import {AsyncPipe} from "@angular/common";
 import {map, Observable, of} from "rxjs";
 import {FacultyResponse} from "@model/facultyResponse";
 import {GroupResponse} from "@model/groupResponse";
+import {LoadingIndicatorComponent} from "@component/loading-indicator/loading-indicator.component";
 
 @Component({
   selector: 'app-schedule-tabs-group',
   standalone: true,
   imports: [
     MatExpansionModule,
-    DataSpinnerComponent,
     MatChipsModule,
     ReactiveFormsModule,
+    LoadingIndicatorComponent,
     AsyncPipe
   ],
   templateUrl: './schedule-tabs-group.component.html',
   styleUrl: './schedule-tabs-group.component.css'
 })
+
 export class ScheduleTabsGroupComponent {
-  protected facultiesId: number | null = null;
+  protected facultyId: number | null = null;
   protected courseNumber: number | null = null;
+
   protected filteredGroups: Observable<GroupResponse[]> = of([]);
   protected courseNumbers: Observable<number[]> = of([]);
   protected groups: Observable<GroupResponse[]> = of([]);
@@ -35,8 +37,12 @@ export class ScheduleTabsGroupComponent {
   @ViewChild('groupPanel') groupPanel!: MatExpansionPanel;
 
   @Input() faculties: Observable<FacultyResponse[]> = of([]);
+  @Input() facultiesLoaded: boolean | null = false;
+  @Output() facultiesLoadRetry: EventEmitter<void> = new EventEmitter<void>();
+  @Input() groupsLoaded: boolean | null = false;
+  @Output() groupsLoadRetry: EventEmitter<number> = new EventEmitter<number>();
 
-  @Input() set groupsSet(data: Observable<GroupResponse[]>) {
+  @Input() set setGroups(data: Observable<GroupResponse[]>) {
     this.groups = data;
     this.courseNumbers = this.groups.pipe(
       map(data => data.map(g => g.courseNumber)),
@@ -48,23 +54,23 @@ export class ScheduleTabsGroupComponent {
   @Output() groupSelected = new EventEmitter<number>();
   @Output() facultySelected = new EventEmitter<number>();
 
-  protected selectedFaculty(event: MatChipListboxChange) {
+  protected chooseFaculty(event: MatChipListboxChange) {
     this.courseNumber = null;
     this.groups = of([]);
     this.chipGroup.reset();
     this.chipCourse.reset();
 
     if (event.value === undefined || event.value === null) {
-      this.facultiesId = null;
+      this.facultyId = null;
       return;
     }
-    this.facultiesId = event.value;
+    this.facultyId = event.value;
     this.courseNumberPanel.open();
 
-    this.facultySelected.emit(this.facultiesId!);
+    this.facultySelected.emit(this.facultyId!);
   }
 
-  protected selectCourseNumber(event: MatChipListboxChange) {
+  protected chooseCourseNumber(event: MatChipListboxChange) {
     this.filteredGroups = of([]);
     this.chipGroup.reset();
 
@@ -79,7 +85,7 @@ export class ScheduleTabsGroupComponent {
       this.filteredGroups = of(data.filter(g => g.courseNumber === this.courseNumber)));
   }
 
-  protected selectGroup(event: MatChipListboxChange) {
+  protected chooseGroup(event: MatChipListboxChange) {
     if (event.value === undefined || event.value === null)
       return;
 
diff --git a/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.html b/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.html
index c4a98d3..b132e17 100644
--- a/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.html
+++ b/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.html
@@ -5,13 +5,13 @@
         Кампус
       </mat-panel-title>
     </mat-expansion-panel-header>
-    <mat-chip-listbox hideSingleSelectionIndicator (change)="selectedCampus($event)">
+    <mat-chip-listbox hideSingleSelectionIndicator (change)="chooseCampus($event)">
       @for (campus of campuses | async; track $index) {
         <mat-chip-option [value]="campus.id" color="accent">
           {{ campus.codeName }}
         </mat-chip-option>
       } @empty {
-        <app-data-spinner/>
+        <app-loading-indicator [loading]="campusesLoaded !== null" (retryFunction)="campusesLoadRetry.emit()"/>
       }
     </mat-chip-listbox>
   </mat-expansion-panel>
@@ -22,13 +22,13 @@
         Кабинет
       </mat-panel-title>
     </mat-expansion-panel-header>
-    <mat-chip-listbox hideSingleSelectionIndicator (change)="selectedLectureHall($event)" [formControl]="chipLecture">
+    <mat-chip-listbox hideSingleSelectionIndicator (change)="chooseLectureHall($event)" [formControl]="chipLecture">
       @for (lectureHall of lectureHalls | async; track $index) {
         <mat-chip-option [value]="lectureHall.id" color="accent">
           {{ lectureHall.name }}
         </mat-chip-option>
       } @empty {
-        <app-data-spinner/>
+        <app-loading-indicator [loading]="lectureHallsLoaded !== null" (retryFunction)="lectureHallsLoadRetry.emit()"/>
       }
     </mat-chip-listbox>
   </mat-expansion-panel>
diff --git a/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.ts b/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.ts
index 29eed08..3072c5a 100644
--- a/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.ts
+++ b/src/components/schedule-tabs/schedule-tabs-lecture-hall/schedule-tabs-lecture-hall.component.ts
@@ -1,23 +1,23 @@
 import {Component, EventEmitter, Input, Output, ViewChild} from '@angular/core';
 import {AsyncPipe} from "@angular/common";
-import {DataSpinnerComponent} from "@component/data-spinner/data-spinner.component";
 import {MatAccordion, MatExpansionModule, MatExpansionPanel} from "@angular/material/expansion";
 import {MatChipListboxChange, MatChipsModule} from "@angular/material/chips";
 import {Observable, of} from "rxjs";
 import {CampusBasicInfoResponse} from "@model/campusBasicInfoResponse";
 import {FormControl, ReactiveFormsModule} from "@angular/forms";
 import {LectureHallResponse} from "@model/lectureHallResponse";
+import {LoadingIndicatorComponent} from "@component/loading-indicator/loading-indicator.component";
 
 @Component({
   selector: 'app-schedule-tabs-lecture-hall',
   standalone: true,
   imports: [
     MatChipsModule,
-    DataSpinnerComponent,
     MatExpansionModule,
     AsyncPipe,
     ReactiveFormsModule,
-    MatAccordion
+    MatAccordion,
+    LoadingIndicatorComponent
   ],
   templateUrl: './schedule-tabs-lecture-hall.component.html',
   styleUrl: './schedule-tabs-lecture-hall.component.css'
@@ -29,12 +29,16 @@ export class ScheduleTabsLectureHallComponent {
   @ViewChild('lecturePanel') lecturePanel!: MatExpansionPanel;
 
   @Input() campuses: Observable<CampusBasicInfoResponse[]> = of([]);
+  @Input() campusesLoaded: boolean | null = false;
+  @Output() campusesLoadRetry: EventEmitter<void> = new EventEmitter<void>();
   @Input() lectureHalls: Observable<LectureHallResponse[]> = of([]);
+  @Input() lectureHallsLoaded: boolean | null = false;
+  @Output() lectureHallsLoadRetry: EventEmitter<number> = new EventEmitter<number>();
 
   @Output() campusSelected = new EventEmitter<number>();
   @Output() lectureHallSelected = new EventEmitter<number>();
 
-  protected selectedCampus(event: MatChipListboxChange) {
+  protected chooseCampus(event: MatChipListboxChange) {
     this.chipLecture.reset();
 
     if (event.value === undefined || event.value === null) {
@@ -49,7 +53,7 @@ export class ScheduleTabsLectureHallComponent {
     this.campusSelected.emit(this.campusId!);
   }
 
-  protected selectedLectureHall(event: MatChipListboxChange) {
+  protected chooseLectureHall(event: MatChipListboxChange) {
     if (event.value === undefined || event.value === null)
       return;
 
diff --git a/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.html b/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.html
index a6e5bfc..9c7b0b5 100644
--- a/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.html
+++ b/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.html
@@ -1,31 +1,34 @@
 <!--suppress CssInvalidPropertyValue -->
-<button mat-button [matMenuTriggerFor]="menu" #menuTrigger="matMenuTrigger" [id]="idButton">{{ buttonText }}</button>
+<button mat-button [matMenuTriggerFor]="menu" #menuTrigger="matMenuTrigger" [id]="idButton">{{ textButton }}</button>
 
 <mat-menu #menu="matMenu" [hasBackdrop]="false" class="menu-options">
   <div (click)="$event.stopPropagation()" (keydown)="$event.stopPropagation()" style="padding: 0 15px 15px">
     <div class="header-menu">
       <mat-form-field appearance="outline" color="accent" style="display:flex;">
         <input matInput placeholder="Поиск..." [(ngModel)]="searchQuery" [disabled]="data.length === 0">
-        <button mat-icon-button matSuffix (click)="clearSearch()" [disabled]="data.length === 0">
+        <button mat-icon-button matSuffix (click)="clearSearchQuery()" [disabled]="data.length === 0">
           <mat-icon style="color: var(--mdc-filled-button-label-text-color);">close</mat-icon>
         </button>
       </mat-form-field>
 
       <div class="button-group">
-        <mat-checkbox (click)="selectData()" [disabled]="data.length === 0" #chooseCheckbox/>
+        <mat-checkbox (click)="checkData()" [disabled]="data.length === 0" #chooseCheckbox/>
         <button mat-button (click)="clearAll()" [disabled]="data.length === 0">Очистить</button>
       </div>
       <hr/>
     </div>
     @if (data.length === 0) {
-      <app-data-spinner style="display: flex; justify-content: center;"/>
+      <app-loading-indicator style="display: flex; justify-content: center;" [loading]="dataLoaded !== null"
+                             (retryFunction)="retryLoadData.emit()"/>
     } @else {
       <mat-selection-list>
         @if (filteredData.value.length !== 0) {
-          <cdk-virtual-scroll-viewport autosize [minBufferPx]="300" [maxBufferPx]="500" style="height: 250px; width: 260px; overflow-x: clip;">
+          <cdk-virtual-scroll-viewport autosize [minBufferPx]="300" [maxBufferPx]="500"
+                                       style="height: 250px; width: 260px; overflow-x: clip;">
             <div *cdkVirtualFor="let item of filteredData">
-              <mat-list-option togglePosition="before" style="height: auto;" [value]="item.id" [selected]="item.selected"
-                               (click)="selectChange(item.id)">
+              <mat-list-option togglePosition="before" style="height: auto;" [value]="item.id"
+                               [selected]="item.selected"
+                               (click)="checkboxStateChange(item.id)">
                 <div style="text-wrap: balance;">{{ item.name }}</div>
               </mat-list-option>
               <mat-divider style="margin: 10px 0;"/>
diff --git a/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.ts b/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.ts
index 251f7dc..4e4dad8 100644
--- a/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.ts
+++ b/src/components/schedule-tabs/schedule-tabs-other/schedule-tabs-other.component.ts
@@ -1,4 +1,4 @@
-import {Component, HostListener, Input, ViewChild} from '@angular/core';
+import {Component, EventEmitter, HostListener, Input, Output, ViewChild} from '@angular/core';
 import {MatMenu, MatMenuTrigger} from "@angular/material/menu";
 import {MatCheckbox} from "@angular/material/checkbox";
 import {BehaviorSubject} from "rxjs";
@@ -6,12 +6,12 @@ import {MatButton, MatIconButton} from "@angular/material/button";
 import {MatFormField, MatSuffix} from "@angular/material/form-field";
 import {MatIcon} from "@angular/material/icon";
 import {FormsModule} from "@angular/forms";
-import {DataSpinnerComponent} from "@component/data-spinner/data-spinner.component";
 import {MatListOption, MatSelectionList} from "@angular/material/list";
 import {ScrollingModule} from "@angular/cdk/scrolling";
 import {ScrollingModule as ExperimentalScrollingModule} from '@angular/cdk-experimental/scrolling';
 import {MatDivider} from "@angular/material/divider";
 import {MatInput} from "@angular/material/input";
+import {LoadingIndicatorComponent} from "@component/loading-indicator/loading-indicator.component";
 
 export interface SelectData {
   id: number,
@@ -30,7 +30,6 @@ export interface SelectData {
     MatIcon,
     FormsModule,
     MatCheckbox,
-    DataSpinnerComponent,
     MatSelectionList,
     MatListOption,
     MatDivider,
@@ -38,7 +37,8 @@ export interface SelectData {
     MatInput,
     MatSuffix,
     ScrollingModule,
-    ExperimentalScrollingModule
+    ExperimentalScrollingModule,
+    LoadingIndicatorComponent
   ],
   templateUrl: './schedule-tabs-other.component.html',
   styleUrl: './schedule-tabs-other.component.css'
@@ -49,10 +49,13 @@ export class ScheduleTabsOtherComponent {
   protected data: SelectData[] = [];
 
   @Input() idButton!: string;
-  @Input() buttonText!: string;
+  @Input() textButton!: string;
   @ViewChild('menuTrigger') menuTrigger!: MatMenuTrigger;
   @ViewChild('chooseCheckbox') chooseCheckbox!: MatCheckbox;
 
+  @Input() dataLoaded: boolean | null = false;
+  @Output() retryLoadData: EventEmitter<void> = new EventEmitter<void>();
+
   get selectedIds(): number[] {
     return this.data.filter(x => x.selected).map(x => x.id);
   }
@@ -60,7 +63,7 @@ export class ScheduleTabsOtherComponent {
   set Data(data: SelectData[]) {
     this.data = data;
     this.data.forEach(x => x.selected = false);
-    this.filteredData.next(this.data)
+    this.filteredData.next(this.data);
   }
 
   protected get searchQuery(): string {
@@ -83,7 +86,7 @@ export class ScheduleTabsOtherComponent {
     ));
   }
 
-  protected clearSearch(): void {
+  protected clearSearchQuery(): void {
     this.searchQuery = '';
   }
 
@@ -101,7 +104,7 @@ export class ScheduleTabsOtherComponent {
     this.updateCheckBox();
   }
 
-  protected selectData() {
+  protected checkData() {
     const check: boolean = this.filteredData.value.some(x => !x.selected) && !this.filteredData.value.every(x => x.selected);
 
     const updatedData = this.filteredData.value.map(data => {
@@ -113,7 +116,7 @@ export class ScheduleTabsOtherComponent {
     this.updateCheckBox();
   }
 
-  selectChange(item: number) {
+  protected checkboxStateChange(item: number) {
     const data = this.data.find(x => x.id === item)!;
     data.selected = !data.selected;
     const updatedData = this.filteredData.value;
diff --git a/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.html b/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.html
index 5c5d54a..3fc2074 100644
--- a/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.html
+++ b/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.html
@@ -1,13 +1,13 @@
 <div class="search-content">
-  @if (teachers.length === 0) {
-    <app-data-spinner/>
+  @if (professors.length === 0) {
+    <app-loading-indicator [loading]="professorsLoaded !== null" (retryFunction)="professorsLoadRetry.emit()"/>
   } @else {
     <mat-form-field color="accent" style="width: 100%;">
-      <input type="text" placeholder="Поиск..." matInput [formControl]="teacherControl" [matAutocomplete]="auto">
+      <input type="text" placeholder="Поиск..." matInput [formControl]="professorControl" [matAutocomplete]="auto">
 
       <mat-autocomplete #auto="matAutocomplete" (optionSelected)="onOptionSelected($event)"
                         [autoActiveFirstOption]="false" [hideSingleSelectionIndicator]="true">
-        @for (option of filteredTeachers | async; track option) {
+        @for (option of filteredProfessors | async; track option) {
           <mat-option [value]="option.id">
             {{ option.name }}
           </mat-option>
diff --git a/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.ts b/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.ts
index 644efce..798bccb 100644
--- a/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.ts
+++ b/src/components/schedule-tabs/schedule-tabs-professor/schedule-tabs-professor.component.ts
@@ -3,9 +3,9 @@ import {MatFormField, MatInput} from "@angular/material/input";
 import {FormControl, ReactiveFormsModule} from "@angular/forms";
 import {MatAutocompleteModule, MatAutocompleteSelectedEvent} from "@angular/material/autocomplete";
 import {AsyncPipe} from "@angular/common";
-import {DataSpinnerComponent} from "@component/data-spinner/data-spinner.component";
 import {map, Observable, startWith} from "rxjs";
 import {ProfessorResponse} from "@model/professorResponse";
+import {LoadingIndicatorComponent} from "@component/loading-indicator/loading-indicator.component";
 
 @Component({
   selector: 'app-schedule-tabs-professor',
@@ -13,43 +13,46 @@ import {ProfessorResponse} from "@model/professorResponse";
   imports: [
     MatAutocompleteModule,
     MatFormField,
-    DataSpinnerComponent,
     AsyncPipe,
     ReactiveFormsModule,
-    MatInput
+    MatInput,
+    LoadingIndicatorComponent
   ],
   templateUrl: './schedule-tabs-professor.component.html',
   styleUrl: './schedule-tabs-professor.component.css'
 })
 export class ScheduleTabsProfessorComponent implements OnInit {
-  protected teacherControl = new FormControl();
-  protected filteredTeachers!: Observable<ProfessorResponse[]>;
+  protected professorControl = new FormControl();
+  protected filteredProfessors!: Observable<ProfessorResponse[]>;
 
-  @Input() teachers: ProfessorResponse[] = [];
+  @Input() professors: ProfessorResponse[] = [];
   @Output() professorSelected = new EventEmitter<number>();
 
+  @Input() professorsLoaded: boolean | null = false;
+  @Output() professorsLoadRetry: EventEmitter<void> = new EventEmitter<void>();
+
   ngOnInit(): void {
-    this.filteredTeachers = this.teacherControl.valueChanges.pipe(
+    this.filteredProfessors = this.professorControl.valueChanges.pipe(
       startWith(''),
-      map(value => this._filterTeachers(value))
+      map(value => this._filterProfessors(value))
     );
   }
 
-  private _filterTeachers(value: string | number): ProfessorResponse[] {
+  private _filterProfessors(value: string | number): ProfessorResponse[] {
     if (typeof value === 'string') {
       if (value === '') return [];
       const filterValue = value.toLowerCase();
-      return this.teachers.filter(teacher => teacher.name.toLowerCase().includes(filterValue));
+      return this.professors.filter(teacher => teacher.name.toLowerCase().includes(filterValue));
     } else {
-      const selectedTeacher = this.teachers.find(teacher => teacher.id === value);
+      const selectedTeacher = this.professors.find(teacher => teacher.id === value);
       return selectedTeacher ? [selectedTeacher] : [];
     }
   }
 
   protected onOptionSelected(event: MatAutocompleteSelectedEvent) {
-    const selectedOption = this.teachers.find(teacher => teacher.id === event.option.value);
+    const selectedOption = this.professors.find(teacher => teacher.id === event.option.value);
     if (selectedOption) {
-      this.teacherControl.setValue(selectedOption.name);
+      this.professorControl.setValue(selectedOption.name);
       this.professorSelected.emit(selectedOption.id);
     }
   }