Guard setup inputs on the real project load error and hydration state

ui/src/app/services/config/config-mediated.spec.ts

@@ -1075,6 +1075,130 @@ describe('ConfigService (mediated data plane)', () => {
       errorSpy.mockRestore();
     });
 
+    it('leaves projectConfig.error() undefined after load failure, setting projectLoadError instead', async () => {
+      const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+      httpClientMock.get.mockImplementation((url: string) => {
+        if (url === '/api/config') return of({});
+        return throwError(() => new HttpErrorResponse({status: 500}));
+      });
+
+      service.loadProjectConfig('proj-err', 'full');
+      await vi.waitFor(() => {
+        expect(service.projectLoadError()).toBe(true);
+      });
+
+      // rxResource catches the error and degrades to DEFAULT_PROJECT_CONFIG,
+      // so projectConfig.error() is permanently undefined.
+      expect(service.projectConfig.error()).toBeUndefined();
+      expect(service.setupInputsError()).toBe(true);
+      expect(service.setupInputsLoaded()).toBe(false);
+      errorSpy.mockRestore();
+    });
+
+    it('evaluates setupInputsLoaded to false when projectLoadError is set even if id matches', () => {
+      service.projectConfig.value.set({
+        ...service.projectConfig.value(),
+        id: 'proj-matched',
+      });
+      service.loadProjectConfig('proj-matched', 'full');
+      expect(service.setupInputsLoaded()).toBe(true);
+
+      // When a load error is recorded, setupInputsLoaded must be false even though
+      // value().id === projectId() is true.
+      (service as any).projectLoadErrorValue.set(new Error('load failed'));
+      expect(service.projectLoadError()).toBe(true);
+      expect(service.setupInputsLoaded()).toBe(false);
+    });
+
+    it('evaluates setupInputsLoaded to false on 404 with in-flight autosave to prevent destructive full PATCH', async () => {
+      const editorProject = {
+        ...service.projectConfig.value(),
+        id: 'proj-hydrate',
+        inputConfig: undefined,
+      };
+      httpClientMock.get.mockImplementation((url: string) => {
+        if (url === '/api/config') return of({});
+        if (url.includes('/api/projects/proj-hydrate')) {
+          if (url.endsWith('?view=editor')) {
+            return of(editorProject);
+          }
+          return throwError(() => new HttpErrorResponse({status: 404}));
+        }
+        return of({});
+      });
+
+      service.loadProjectConfig('proj-hydrate', 'editor');
+      await vi.waitFor(() => {
+        expect(service.projectConfig.value().id).toBe('proj-hydrate');
+      });
+      markPersisted('proj-hydrate');
+
+      const inFlightPatch = new Subject<any>();
+      httpClientMock.patch.mockReturnValue(inFlightPatch);
+      service.updateProjectConfig({name: 'in-flight'});
+      service.saveNow();
+
+      service.loadProjectConfig('proj-hydrate', 'full');
+      await vi.waitFor(() => {
+        expect(httpClientMock.get).toHaveBeenCalledWith(
+          '/api/projects/proj-hydrate',
+        );
+      });
+      await Promise.resolve();
+      await Promise.resolve();
+
+      // On 404 with localProjectAtLoad, the loader preserves local latestSource so the user
+      // is not disrupted, but setupInputsLoaded MUST be false because full server inputs were not hydrated.
+      expect(service.setupInputsLoaded()).toBe(false);
+      expect(service.projectConfig.value().id).toBe('proj-hydrate');
+      expect(service.projectConfig.value().inputConfig).toBeUndefined();
+      expect(service.setupInputsError()).toBe(true);
+      expect(service.projectLoadError()).toBe(false);
+    });
+
+    it('navigates home and resets project on 404 without local copy', async () => {
+      const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+      httpClientMock.get.mockImplementation((url: string) => {
+        if (url === '/api/config') return of({});
+        return throwError(() => new HttpErrorResponse({status: 404}));
+      });
+
+      service.loadProjectConfig('non-existent', 'full');
+      await vi.waitFor(() => {
+        expect(httpClientMock.get).toHaveBeenCalledWith(
+          '/api/projects/non-existent',
+        );
+      });
+      await Promise.resolve();
+      await Promise.resolve();
+
+      expect(service.setupInputsLoaded()).toBe(false);
+      expect(service.projectConfig.value().id).toBe('');
+      expect(TestBed.inject(Router).navigate).toHaveBeenCalledWith(['/']);
+      errorSpy.mockRestore();
+    });
+
+    it('yields setupInputsLoaded === true on normal successful load', async () => {
+      const fullProject = {
+        ...service.projectConfig.value(),
+        id: 'proj-ok',
+        inputConfig: {products: [], composition: 'ok'},
+      };
+      httpClientMock.get.mockImplementation((url: string) => {
+        if (url === '/api/config') return of({});
+        if (url === '/api/projects/proj-ok') return of(fullProject);
+        return of({});
+      });
+
+      service.loadProjectConfig('proj-ok', 'full');
+      await vi.waitFor(() => {
+        expect(service.projectConfig.value().id).toBe('proj-ok');
+      });
+
+      expect(service.projectLoadError()).toBe(false);
+      expect(service.setupInputsLoaded()).toBe(true);
+    });
+
     it('keeps a locally created full project ready after leaving another project', () => {
       service.projectConfig.value.set({
         ...service.projectConfig.value(),

ui/src/app/services/config/config.ts

@@ -644,6 +644,7 @@ export class ConfigService {
   private projectId = signal<string | null>(null);
   private projectView = signal<ProjectConfigView>('full');
   private projectLoadErrorValue = signal<unknown>(undefined);
+  private setupInputsHydrated = signal<boolean>(false);
   /**
    * Mediated mode only: ids known to exist server-side (loaded via GET or
    * already POSTed). First save of a new project goes through
@@ -946,6 +947,7 @@ export class ConfigService {
     loader: async ({params, abortSignal}) => {
       if (params.projectId === null) {
         this.projectLoadErrorValue.set(undefined);
+        this.setupInputsHydrated.set(false);
         return {...this.DEFAULT_PROJECT_CONFIG()};
       }
       const isCurrentLoad = () =>
@@ -954,6 +956,7 @@ export class ConfigService {
         this.projectView() === params.view;
       if (isCurrentLoad()) {
         this.projectLoadErrorValue.set(undefined);
+        this.setupInputsHydrated.set(false);
       }
       const localProjectAtLoad = this.projectWithUnsettledSave(
         params.projectId,
@@ -967,6 +970,9 @@ export class ConfigService {
         if (isCurrentLoad()) {
           this.projectLoadErrorValue.set(undefined);
           this.persistedProjectIds.add(params.projectId);
+          if (params.view === 'full') {
+            this.setupInputsHydrated.set(true);
+          }
         }
         if (localProjectAtLoad) {
           const latest =
@@ -1021,16 +1027,32 @@ export class ConfigService {
       (!!this.projectLoadErrorValue() || !!this.projectConfig.error()),
   );
   readonly setupInputsError = computed(
-    () => this.projectView() === 'full' && this.projectLoadError(),
-  );
-  readonly setupInputsLoaded = computed(
     () =>
       this.projectView() === 'full' &&
-      !this.projectConfig.isLoading() &&
-      !this.projectConfig.error() &&
-      (this.projectConfig.value().id === this.projectId() ||
-        (this.projectId() === null && !!this.projectConfig.value().id)),
+      (this.projectLoadError() ||
+        (this.projectId() !== null &&
+          !this.projectConfig.isLoading() &&
+          this.projectConfig.value().id === this.projectId() &&
+          !this.setupInputsHydrated())),
   );
+  /**
+   * Setup may expose its input fields only when the current project's
+   * inputConfig came from a successful full server load, or the project was
+   * created locally.
+   */
+  readonly setupInputsLoaded = computed(() => {
+    const isLocalNewProject =
+      this.projectId() === null && !!this.projectConfig.value().id;
+    const isHydratedServerProject =
+      this.setupInputsHydrated() &&
+      this.projectConfig.value().id === this.projectId();
+    return (
+      this.projectView() === 'full' &&
+      !this.projectConfig.isLoading() &&
+      !this.projectLoadError() &&
+      (isLocalNewProject || isHydratedServerProject)
+    );
+  });
 
   private normalizeLoadedProject(data: ProjectConfig): ProjectConfig {
     if (data.renderRuns) {
@@ -1491,6 +1513,7 @@ export class ConfigService {
     // would otherwise be silently dropped once the config resets (the
     // post-reset emission has id === '' / shouldSave === false).
     this.flushPendingSave();
+    this.setupInputsHydrated.set(false);
     this.projectId.set(null);
     this.projectConfig.set({...this.DEFAULT_PROJECT_CONFIG()});
     this.shouldSave = false;
@@ -1510,6 +1533,7 @@ export class ConfigService {
     // Not persisted yet: the first autosave POSTs /api/projects, where the
     // server stamps createdBy from the verified identity. Left undefined here.
     this.persistedProjectIds.delete(uuid);
+    this.setupInputsHydrated.set(true);
     const project = {
       ...this.DEFAULT_PROJECT_CONFIG(),
       id: uuid,

ui/src/app/setup/setup.html

@@ -20,6 +20,7 @@
     <button mat-button type="button" (click)="config.reloadProjectConfig()">
       Retry
     </button>
+    <a mat-button routerLink="/">Back to projects</a>
   </div>
 } @else if (setupLoading() || !setupReady()) {
   <div class="loading-state">

ui/src/app/setup/setup.spec.ts

@@ -123,6 +123,85 @@ describe('Setup full-load failure', () => {
       fixture.nativeElement.querySelector('.setup-container'),
     ).not.toBeNull();
   });
+
+  it('does not show an error before a project load or while the load is pending', () => {
+    expect(config.setupInputsError()).toBe(false);
+    expect(fixture.nativeElement.textContent).not.toContain(
+      'Could not load this project',
+    );
+    config.loadProjectConfig('pending-project', 'full');
+    expect(config.setupInputsError()).toBe(false);
+    TestBed.tick();
+    fixture.detectChanges();
+    expect(fixture.nativeElement.querySelector('mat-spinner')).not.toBeNull();
+    expect(config.setupInputsError()).toBe(false);
+    http
+      .expectOne('/api/projects/pending-project')
+      .flush('failed', {status: 500, statusText: 'Server Error'});
+  });
+
+  it('offers recovery without blank inputs or full PATCH after both load and pending save return 404', async () => {
+    (
+      config as unknown as {persistedProjectIds: Set<string>}
+    ).persistedProjectIds.add('proj-unsettled');
+
+    config.loadProjectConfig('proj-unsettled', 'editor');
+    TestBed.tick();
+    const editorReq = http.expectOne(
+      '/api/projects/proj-unsettled?view=editor',
+    );
+    editorReq.flush({
+      id: 'proj-unsettled',
+      name: 'Editor Project',
+      aspectRatio: '16:9',
+      resolution: '720p',
+      candidateDurationSeconds: 4,
+      generateAudio: false,
+      numberOfCandidates: 1,
+      model: 'veo-default',
+      inputConfig: undefined,
+      storyboard: [],
+      audioTracks: [],
+      visualOverlays: [],
+    });
+    TestBed.tick();
+    await fixture.whenStable();
+
+    config.updateProjectConfig({name: 'In-Flight'});
+    config.saveNow();
+    const inFlightPatch = http.expectOne('/api/projects/proj-unsettled/editor');
+
+    config.loadProjectConfig('proj-unsettled', 'full');
+    expect(config.setupInputsError()).toBe(false);
+    TestBed.tick();
+    expect(config.setupInputsError()).toBe(false);
+    const fullGet = http.expectOne('/api/projects/proj-unsettled');
+    fullGet.flush('Not found', {status: 404, statusText: 'Not Found'});
+    TestBed.tick();
+    await fixture.whenStable();
+    fixture.detectChanges();
+
+    expect(config.setupInputsLoaded()).toBe(false);
+    expect(config.projectConfig.value().inputConfig).toBeUndefined();
+    http.expectNone('/api/projects/proj-unsettled');
+
+    inFlightPatch.flush('Not found', {status: 404, statusText: 'Not Found'});
+    TestBed.tick();
+    await fixture.whenStable();
+    fixture.detectChanges();
+
+    expect(config.projectLoadError()).toBe(false);
+    expect(config.setupInputsError()).toBe(true);
+    expect(fixture.nativeElement.querySelector('mat-spinner')).toBeNull();
+    expect(fixture.nativeElement.textContent).toContain(
+      'Could not load this project',
+    );
+    const home = fixture.nativeElement.querySelector('a[href="/"]');
+    expect(home?.textContent).toContain('Back to projects');
+    expect(fixture.nativeElement.querySelector('.setup-container')).toBeNull();
+    expect(config.projectConfig.value().inputConfig).toBeUndefined();
+    http.expectNone('/api/projects/proj-unsettled');
+  });
 });
 
 describe('Setup image upload', () => {