Show/change experiment default template in UI

src/app/components/experiment-workspace-detail/experiment-workspace-detail.component.ts

@@ -203,7 +203,7 @@ export class ExperimentWorkspaceDetailComponent implements OnInit {
     }
 
     private async updateTemplateId(templateId: string | null) {
-        if (templateId == null) {
+        if (templateId == null || templateId === "") {
             return; // no template selected
         }
         if (templateId === this.templateId) {

src/app/components/experiment/experiment.component.html

@@ -32,11 +32,29 @@ <h1 class="t-page-headline">Experiment</h1>
             </button>
         </mat-card-title>
         <mat-card-content>
+            <mat-form-field>
+                <mat-label>Default Template</mat-label>
+                <mat-select (selectionChange)="changeDefaultTemplate($event.value)" [value]="uiTemplateId">
+                    <mat-paginator [pageSize]="itemCount" [length]="uiTemplateCollectionSize" [pageIndex]="uiTemplatePageIndex" 
+                        (page)="getTemplatePage($event.pageIndex)" aria-label="Select page">
+                    </mat-paginator>
+                    <mat-divider></mat-divider>
+                    <mat-option [value]="null">
+                        -- none --
+                    </mat-option>
+                    <mat-option *ngIf="uiTemplateId && !uiTemplates.has(uiTemplateId)" [value]="uiTemplateId">
+                        {{uiTemplateName}}
+                    </mat-option>
+                    <mat-divider></mat-divider>
+                    <mat-option *ngFor="let template of uiTemplates | keyvalue:originalOrder" [value]="template.key">
+                        {{template.value}}
+                    </mat-option>
+                </mat-select>
+            </mat-form-field>
             <qhana-markdown class="description" [markdown]="experimentDescription"
                 (markdownChanges)="updateDescription($event)" [editable]="true">
             </qhana-markdown>
         </mat-card-content>
-
     </mat-card>
     <div class="updates">
         <div class="update-status" *ngIf="updateStatus === 'changed'">

src/app/components/experiment/experiment.component.ts

@@ -1,19 +1,22 @@
+import { KeyValue } from '@angular/common';
 import { Component, OnDestroy, OnInit } from '@angular/core';
 import { MatDialog } from '@angular/material/dialog';
 import { ActivatedRoute, Router } from '@angular/router';
 import { BehaviorSubject, Subscription } from 'rxjs';
 import { debounceTime, filter, map } from 'rxjs/operators';
 import { ExportExperimentDialog } from 'src/app/dialogs/export-experiment/export-experiment.component';
+import { PageApiObject } from 'src/app/services/api-data-types';
 import { CurrentExperimentService } from 'src/app/services/current-experiment.service';
 import { ExperimentApiObject, QhanaBackendService } from 'src/app/services/qhana-backend.service';
+import { PluginRegistryBaseService } from 'src/app/services/registry.service';
+import { TemplatesService } from 'src/app/services/templates.service';
 
 @Component({
     selector: 'qhana-experiment',
     templateUrl: './experiment.component.html',
     styleUrls: ['./experiment.component.sass']
 })
 export class ExperimentComponent implements OnInit, OnDestroy {
-
     private routeSubscription: Subscription | null = null;
 
     private experimentSubscription: Subscription | null = null;
@@ -24,6 +27,7 @@ export class ExperimentComponent implements OnInit, OnDestroy {
     private descriptionUpdates: BehaviorSubject<string | null> = new BehaviorSubject<string | null>(null);
     private autoSaveTitleSubscription: Subscription | null = null;
     private autoSaveDescriptionSubscription: Subscription | null = null;
+    private uiTemplateIdSubscription: Subscription | null = null;
 
     updateStatus: "original" | "changed" | "saved" = "original";
 
@@ -34,7 +38,15 @@ export class ExperimentComponent implements OnInit, OnDestroy {
     experimentDescription: string = ""; // only updated on initial experiment load
     currentExperimentDescription: string = "";
 
-    constructor(private route: ActivatedRoute, private router: Router, private experimentService: CurrentExperimentService, private backend: QhanaBackendService, public dialog: MatDialog) { }
+    readonly itemCount: number = 10;
+    uiTemplatePageIndex: number = 0;
+
+    uiTemplates: Map<string, string> = new Map<string, string>();
+    uiTemplateId: string | null = null;
+    uiTemplateName: string | null = null;
+    uiTemplateCollectionSize: number = 0;
+
+    constructor(private route: ActivatedRoute, private router: Router, private experimentService: CurrentExperimentService, private backend: QhanaBackendService, private registry: PluginRegistryBaseService, private templates: TemplatesService, public dialog: MatDialog) { }
 
     ngOnInit(): void {
         this.routeSubscription = this.route.params.pipe(map(params => params.experimentId)).subscribe(experimentId => {
@@ -48,6 +60,17 @@ export class ExperimentComponent implements OnInit, OnDestroy {
             this.lastSavedDescription = experiment?.description ?? "";
             this.experimentDescription = experiment?.description ?? "";
             this.currentExperimentDescription = experiment?.description ?? "";
+            this.uiTemplateId = experiment?.templateId?.toString() ?? null;
+        });
+        this.uiTemplateIdSubscription = this.experimentService.experimentTemplateId.subscribe(templateId => {
+            this.uiTemplateId = templateId?.toString() ?? null;
+            this.getTemplatePage();
+            if (this.uiTemplateId == null) {
+                return;
+            }
+            this.templates.getTemplate(this.uiTemplateId).then(template => {
+                this.uiTemplateName = template?.data.name ?? null;
+            });
         });
         this.autoSaveTitleSubscription = this.titleUpdates.pipe(
             filter(value => value != null && value !== this.lastSavedTitle),
@@ -64,6 +87,7 @@ export class ExperimentComponent implements OnInit, OnDestroy {
         this.experimentSubscription?.unsubscribe();
         this.autoSaveTitleSubscription?.unsubscribe();
         this.autoSaveDescriptionSubscription?.unsubscribe();
+        this.uiTemplateIdSubscription?.unsubscribe();
     }
 
     cloneExperiment() {
@@ -156,4 +180,39 @@ export class ExperimentComponent implements OnInit, OnDestroy {
         });
     }
 
+    async changeDefaultTemplate(templateId: string | null) {
+        if (this.experimentId == null) {
+            this.uiTemplatePageIndex = 0;
+            this.uiTemplateId = null;
+            this.uiTemplateName = null;
+            return;
+        }
+        this.uiTemplateName = this.uiTemplates.get(templateId ?? "") ?? null;
+        await this.templates.setExperimentDefaultTemplate(this.experimentId, templateId);
+        this.experimentService.reloadExperiment();
+    }
+
+    async getTemplatePage(pageIndex: number = 0) {
+        const uiTemplates = new Map<string, string>();
+        const params = new URLSearchParams();
+        params.set("sort", "name");
+        params.set("item-count", this.itemCount.toString());
+        params.set("cursor", (pageIndex + 1).toString());
+        await this.registry.getByRel<PageApiObject>([["ui-template", "collection"]], params).then(result => {
+            this.uiTemplateCollectionSize = result?.data.collectionSize ?? 0;
+            result?.data.items.forEach(item => {
+                const templateId = item.resourceKey?.uiTemplateId;
+                const name = item.name;
+                if (templateId != null && name != null) {
+                    uiTemplates.set(templateId, name);
+                }
+            });
+        });
+        this.uiTemplates = uiTemplates;
+        this.uiTemplatePageIndex = pageIndex;
+    }
+
+    originalOrder = (a: KeyValue<string, string>, b: KeyValue<string, string>): number => {
+        return 0;
+    }
 }

src/app/services/current-experiment.service.ts

@@ -45,6 +45,10 @@ export class CurrentExperimentService {
         return this.currentExperiment.asObservable().pipe(map(experiment => experiment?.description ?? null));
     }
 
+    get experimentTemplateId() {
+        return this.currentExperiment.asObservable().pipe(map(experiment => experiment?.templateId ?? null));
+    }
+
     constructor(private backend: QhanaBackendService) { }
 
     private updateCurrentExperiment(experimentId: string | null) {
@@ -64,7 +68,7 @@ export class CurrentExperimentService {
             this.currentExperimentId.next(experimentId);
         }
         const current = this.currentExperiment.getValue();
-        if (current != experiment || current?.name !== experiment?.name || current?.description !== experiment?.description) {
+        if (current != experiment || current?.name !== experiment?.name || current?.description !== experiment?.description || current?.templateId !== experiment?.templateId) {
             this.currentExperiment.next(experiment);
         }
     }
@@ -81,5 +85,4 @@ export class CurrentExperimentService {
             this.updateCurrentExperiment(experimentId);
         }
     }
-
 }

src/app/services/qhana-backend.service.ts

@@ -177,6 +177,15 @@ export interface TimelineStepPageOptions {
     unclearedSubstep?: number;
 }
 
+export interface TemplateApiObject extends ApiObject {
+    templateId: string;
+}
+
+export interface TemplatePostResponseApiObject extends ApiObject {
+    experimentId: number;
+    templateId?: string;
+}
+
 function urlIsString(url: string | null): url is string {
     return url != null;
 }
@@ -491,4 +500,16 @@ export class QhanaBackendService {
             rootUrl => this.http.get<TimelineSubStepApiObject>(`${rootUrl}/experiments/${experimentId}/timeline/${step}/substeps/${substep}`)
         );
     }
+
+    public getExperimentDefaultTemplate(experimentId: number | string): Observable<TemplateApiObject> {
+        return this.callWithRootUrl<TemplateApiObject>(
+            rootUrl => this.http.get<TemplateApiObject>(`${rootUrl}/experiments/${experimentId}/template`)
+        );
+    }
+
+    public updateExperimentDefaultTemplate(experimentId: number | string, templateId: string | number | null): Observable<TemplatePostResponseApiObject> {
+        return this.callWithRootUrl<TemplatePostResponseApiObject>(
+            rootUrl => this.http.post<TemplatePostResponseApiObject>(`${rootUrl}/experiments/${experimentId}/template`, { templateId: templateId })
+        );
+    }
 }

src/app/services/registry.service.ts

@@ -483,7 +483,13 @@ export class PluginRegistryBaseService {
 
     public async getByApiLink<T>(link: ApiLink, searchParams: URLSearchParams | null = null, ignoreCache: boolean | "ignore-embedded" = false): Promise<ApiResponse<T> | null> {
         const url = new URL(link.href)
-        searchParams?.forEach((value, key) => url.searchParams.append(key, value));
+        searchParams?.forEach((value, key) => {
+            if (url.searchParams.has(key)) {
+                url.searchParams.set(key, value);
+            } else {
+                url.searchParams.append(key, value);
+            }
+        });
         return await this._fetch<ApiResponse<T>>(url.toString(), ignoreCache);
     }
 

src/app/services/templates.service.ts

@@ -20,8 +20,9 @@ import { ApiLink, ApiObject, PageApiObject } from './api-data-types';
 import { CurrentExperimentService } from './current-experiment.service';
 import { PluginRegistryBaseService } from './registry.service';
 import { EnvService } from './env.service';
-import { distinctUntilChanged } from 'rxjs/operators';
+import { distinctUntilChanged, take } from 'rxjs/operators';
 import { ActivatedRoute } from '@angular/router';
+import { QhanaBackendService } from './qhana-backend.service';
 
 
 export interface TemplateApiObject extends ApiObject {  // TODO check fields
@@ -104,7 +105,7 @@ export class TemplatesService {
         return this.currentTemplateSubject.asObservable();
     }
 
-    constructor(private registry: PluginRegistryBaseService, private env: EnvService, private currentExperiment: CurrentExperimentService, private route: ActivatedRoute) {
+    constructor(private registry: PluginRegistryBaseService, private env: EnvService, private currentExperiment: CurrentExperimentService, private backend: QhanaBackendService, private route: ActivatedRoute) {
         this.envSubscription = env.uiTemplateId.subscribe((defaultTemplateId) => {
             this.envTemplateIdSubject.next(defaultTemplateId);
         });
@@ -200,7 +201,7 @@ export class TemplatesService {
     }
 
     private async updateTemplate(templateId: string | null, subject: BehaviorSubject<TemplateApiObject | null>) {
-        if (templateId == null) {
+        if (templateId == null || templateId === "") {
             subject.next(null);
             return;
         }
@@ -231,4 +232,12 @@ export class TemplatesService {
         const templateResponse = await this.getTemplate(templateId, ignoreCache);
         return templateResponse?.data?.groups ?? [];
     }
+
+    async setExperimentDefaultTemplate(experimentId: string, templateId: string | null) {
+        this.backend.updateExperimentDefaultTemplate(experimentId, templateId).pipe(take(1)).subscribe(
+            response => {
+                this.experimentTemplateIdSubject.next(response?.templateId ?? null);
+            }
+        );
+    }
 }