Fix poll progress

Fixes a regression in the poll progress.
Poll progress war no longer working for assignments

client/src/app/site/polls/components/poll-progress/poll-progress.component.ts

@@ -1,114 +1,57 @@
-import { Component, Input, OnDestroy } from '@angular/core';
+import { Component, Input, OnInit } from '@angular/core';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import { Title } from '@angular/platform-browser';
 
 import { TranslateService } from '@ngx-translate/core';
-import { Subscription } from 'rxjs';
+import { map } from 'rxjs/operators';
 
-import { MotionPollRepositoryService } from 'app/core/repositories/motions/motion-poll-repository.service';
 import { UserRepositoryService } from 'app/core/repositories/users/user-repository.service';
 import { BaseViewComponent } from 'app/site/base/base-view';
 import { ViewBasePoll } from 'app/site/polls/models/view-base-poll';
-import { ViewUser } from 'app/site/users/models/view-user';
 
 @Component({
     selector: 'os-poll-progress',
     templateUrl: './poll-progress.component.html',
     styleUrls: ['./poll-progress.component.scss']
 })
-export class PollProgressComponent extends BaseViewComponent implements OnDestroy {
-    private pollId: number = null;
-    private pollSubscription: Subscription = null;
-
+export class PollProgressComponent extends BaseViewComponent implements OnInit {
     @Input()
-    public set poll(value: ViewBasePoll) {
-        if (value.id !== this.pollId) {
-            this.pollId = value.id;
-
-            this.unsubscribePoll();
-            this.pollSubscription = this.pollRepo.getViewModelObservable(this.pollId).subscribe(poll => {
-                if (poll) {
-                    this._poll = poll;
-                    this.updateVotescast();
-                    this.calculateMaxUsers();
-                }
-            });
-        }
-    }
-    public get poll(): ViewBasePoll {
-        return this._poll;
-    }
-    private _poll: ViewBasePoll;
-
-    public votescast = 0;
+    public poll: ViewBasePoll;
     public max: number;
-    public valueInPercent: number;
+
+    public get votescast(): number {
+        return this.poll?.votescast || 0;
+    }
 
     public constructor(
         title: Title,
         protected translate: TranslateService,
         snackbar: MatSnackBar,
-        private userRepo: UserRepositoryService,
-        private pollRepo: MotionPollRepositoryService
+        private userRepo: UserRepositoryService
     ) {
         super(title, translate, snackbar);
-        this.userRepo.getViewModelListObservable().subscribe(users => {
-            if (users) {
-                this.calculateMaxUsers(users);
-            }
-        });
     }
 
-    private updateVotescast(): void {
-        if (this.poll.votescast === 0) {
-            this.votescast = 0;
-            return;
-        }
-
-        // We may cannot use this.poll.votescast during the voting, since it can
-        // be reported with false values from the server
-        // -> calculate the votes on our own.
-        const ids = new Set();
-        for (const option of this.poll.options) {
-            for (const vote of option.votes) {
-                if (vote.user_id) {
-                    ids.add(vote.user_id);
-                }
-            }
-        }
-        if (ids.size > this.votescast) {
-            this.votescast = ids.size;
-        }
-
-        // But sometimes there are not enough votes (poll.votescast is higher).
-        // If this happens, take the value from the poll
-        if (this.poll.votescast > this.votescast) {
-            this.votescast = this.poll.votescast;
+    public ngOnInit(): void {
+        if (this.poll) {
+            this.subscriptions.push(
+                this.userRepo
+                    .getViewModelListObservable()
+                    .pipe(
+                        map(users =>
+                            users.filter(
+                                user => user.is_present && this.poll.groups_id.intersect(user.groups_id).length
+                            )
+                        )
+                    )
+                    .subscribe(users => {
+                        this.max = users.length;
+                    })
+            );
         }
     }
 
-    private calculateMaxUsers(allUsers?: ViewUser[]): void {
-        if (!this.poll) {
-            return;
-        }
-        if (!allUsers) {
-            allUsers = this.userRepo.getViewModelList();
-        }
-
-        allUsers = allUsers.filter(user => user.is_present && this.poll.groups_id.intersect(user.groups_id).length);
-
-        this.max = allUsers.length;
-        this.valueInPercent = this.poll ? (this.votescast / this.max) * 100 : 0;
-    }
-
-    public ngOnDestroy(): void {
-        this.unsubscribePoll();
-    }
-
-    private unsubscribePoll(): void {
-        if (this.pollSubscription !== null) {
-            this.pollSubscription.unsubscribe();
-            this.pollSubscription = null;
-        }
+    public get valueInPercent(): number {
+        return (this.votescast / this.max) * 100;
     }
 }