docs(frontend): documente la vue recommandations

Route, paramètres ?site= et ?alert=, jointure côté client et sa raison (pas de
site_id sur une recommandation, aucun filtre sur GET /recommendations,
/alerts non paginé), génération réservée aux admins, points d'entrée.

apps/frontend/src/app/app.routes.ts

@@ -1,21 +1,36 @@
 import { Routes } from '@angular/router';
-import {authGuard} from './core/guards/auth-guard';
+import { authGuard } from './core/guards/auth-guard';
 
 export const routes: Routes = [
   { path: '', redirectTo: 'dashboard', pathMatch: 'full' },
-  { path: 'login', loadComponent: () => import('./features/auth/login/login').then(m => m.Login) },
-  { path: 'change-password', loadComponent: () => import('./features/auth/change-password/change-password').then(m => m.ChangePassword) },
-  { path: 'forgot-password', loadComponent: () => import('./features/auth/forgot-password/forgot-password').then(m => m.ForgotPassword) },
-  { path: 'reset-password', loadComponent: () => import('./features/auth/reset-password/reset-password').then(m => m.ResetPassword) },
+  {
+    path: 'login',
+    loadComponent: () => import('./features/auth/login/login').then((m) => m.Login),
+  },
+  {
+    path: 'change-password',
+    loadComponent: () =>
+      import('./features/auth/change-password/change-password').then((m) => m.ChangePassword),
+  },
+  {
+    path: 'forgot-password',
+    loadComponent: () =>
+      import('./features/auth/forgot-password/forgot-password').then((m) => m.ForgotPassword),
+  },
+  {
+    path: 'reset-password',
+    loadComponent: () =>
+      import('./features/auth/reset-password/reset-password').then((m) => m.ResetPassword),
+  },
   {
     path: 'dashboard',
     canActivate: [authGuard],
-    loadComponent: () => import('./features/dashboard/dashboard').then(m => m.Dashboard),
+    loadComponent: () => import('./features/dashboard/dashboard').then((m) => m.Dashboard),
   },
   {
     path: 'sites',
     canActivate: [authGuard],
-    loadComponent: () => import('./features/sites/site-list/site-list').then(m => m.SiteList),
+    loadComponent: () => import('./features/sites/site-list/site-list').then((m) => m.SiteList),
   },
   {
     path: 'sites/:siteId',
@@ -23,6 +38,12 @@ export const routes: Routes = [
     loadComponent: () =>
       import('./features/sites/site-detail/site-detail').then((m) => m.SiteDetail),
   },
+  {
+    path: 'recommendations',
+    canActivate: [authGuard],
+    loadComponent: () =>
+      import('./features/recommendations/recommendations').then((m) => m.RecommendationsView),
+  },
   {
     path: 'monitoring/sensors',
     canActivate: [authGuard],

apps/frontend/src/app/core/services/recommendations.service.spec.ts

@@ -0,0 +1,74 @@
+import { TestBed } from '@angular/core/testing';
+import { provideHttpClient } from '@angular/common/http';
+import { provideHttpClientTesting, HttpTestingController } from '@angular/common/http/testing';
+import { RecommendationsService } from './recommendations.service';
+import { environment } from '../../../environments/environment';
+import { Recommendation } from '../../shared/models/recommendation.model';
+
+const RECOMMANDATION_API: Recommendation = {
+  recommendation_id: 1,
+  alert_id: 1,
+  action: 'Vérifier la consommation',
+  explanation: 'Pic détecté',
+  rule_reference: 'spike-v1',
+  created_at: '2024-01-01T00:00:00Z',
+};
+
+describe('RecommendationsService', () => {
+  let service: RecommendationsService;
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [provideHttpClient(), provideHttpClientTesting()],
+    });
+    service = TestBed.inject(RecommendationsService);
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => httpMock.verify());
+
+  it('liste les recommandations depuis le bon endpoint', () => {
+    let result: Recommendation[] = [];
+    service.getRecommendations().subscribe((r) => (result = r));
+
+    const req = httpMock.expectOne(`${environment.apiUrl}/recommendations`);
+    expect(req.request.method).toBe('GET');
+    req.flush([RECOMMANDATION_API]);
+
+    expect(result.length).toBe(1);
+    expect(result[0].alert_id).toBe(1);
+  });
+
+  it('décrit une recommandation par son identifiant', () => {
+    service.getRecommendation(42).subscribe();
+
+    const req = httpMock.expectOne(`${environment.apiUrl}/recommendations/42`);
+    expect(req.request.method).toBe('GET');
+    req.flush({ ...RECOMMANDATION_API, recommendation_id: 42 });
+  });
+
+  it('déclenche la génération en POST avec le site en paramètre de requête', () => {
+    let result: unknown;
+    service.generate('SITE001').subscribe((r) => (result = r));
+
+    const req = httpMock.expectOne(
+      (r) => r.url === `${environment.apiUrl}/recommendations/generate` && r.method === 'POST',
+    );
+    expect(req.request.params.get('site_id')).toBe('SITE001');
+    expect(req.request.body).toBeNull();
+    req.flush({ alerts_examined: 2, recommendations_created: 3, already_present: 1 });
+
+    expect(result).toEqual({ alerts_examined: 2, recommendations_created: 3, already_present: 1 });
+  });
+
+  it('génère pour tout le parc quand aucun site n’est donné', () => {
+    service.generate().subscribe();
+
+    const req = httpMock.expectOne(
+      (r) => r.url === `${environment.apiUrl}/recommendations/generate` && r.method === 'POST',
+    );
+    expect(req.request.params.has('site_id')).toBe(false);
+    req.flush({ alerts_examined: 0, recommendations_created: 0, already_present: 0 });
+  });
+});

apps/frontend/src/app/core/services/recommendations.service.ts

@@ -0,0 +1,34 @@
+import { Service, inject } from '@angular/core';
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { environment } from '../../../environments/environment';
+import {
+  Recommendation,
+  RecommendationGenerationReport,
+} from '../../shared/models/recommendation.model';
+
+@Service()
+export class RecommendationsService {
+  private http = inject(HttpClient);
+
+  getRecommendations() {
+    return this.http.get<Recommendation[]>(`${environment.apiUrl}/recommendations`);
+  }
+
+  getRecommendation(recommendationId: number) {
+    return this.http.get<Recommendation>(
+      `${environment.apiUrl}/recommendations/${recommendationId}`,
+    );
+  }
+
+  generate(siteId?: string) {
+    let params = new HttpParams();
+    if (siteId) {
+      params = params.set('site_id', siteId);
+    }
+    return this.http.post<RecommendationGenerationReport>(
+      `${environment.apiUrl}/recommendations/generate`,
+      null,
+      { params },
+    );
+  }
+}

apps/frontend/src/app/features/dashboard/dashboard.html

@@ -14,6 +14,7 @@
         <a routerLink="/monitoring/sensors" class="ev-link">Supervision des capteurs</a>
       }
       <a routerLink="/sites" class="ev-link">Voir les sites</a>
+      <a routerLink="/recommendations" class="ev-link">Recommandations</a>
       <ev-button
         class="logout-button"
         variant="secondary"

apps/frontend/src/app/features/recommendations/recommendations.html

@@ -0,0 +1,58 @@
+<div class="recommendations">
+  <nav class="ev-breadcrumb">
+    <a routerLink="/dashboard">Tableau de bord</a>
+  </nav>
+
+  <header class="recommendations__header">
+    <a routerLink="/dashboard" class="ev-brand-link">
+      <ev-brand class="recommendations__logo" />
+    </a>
+    <div>
+      <h1>Recommandations</h1>
+      <p class="recommendations__subtitle">
+        Actions proposées par le moteur de règles à partir des alertes
+      </p>
+    </div>
+  </header>
+
+  <div class="recommendations__toolbar">
+    <label class="recommendations__filter">
+      <span class="form-label">Site</span>
+      <select class="form-select" data-testid="site-filter" (change)="onSiteChange($event)">
+        <option value="" [selected]="!siteFilter()">Tous les sites</option>
+        @for (site of sites(); track site.site_id) {
+          <option [value]="site.site_id" [selected]="site.site_id === siteFilter()">
+            {{ site.site_name }}
+          </option>
+        }
+      </select>
+    </label>
+    @if (isAdmin()) {
+      <ev-button
+        variant="secondary"
+        [fullWidth]="false"
+        [disabled]="generating()"
+        data-testid="generate"
+        (click)="onGenerate()"
+      >
+        {{ generating() ? 'Génération en cours…' : 'Générer les recommandations' }}
+      </ev-button>
+    }
+  </div>
+
+  @if (generationReport(); as report) {
+    <ev-alert severity="success" class="recommendations__banner">{{ bilan(report) }}.</ev-alert>
+  }
+  @if (generationError(); as message) {
+    <ev-alert severity="danger" class="recommendations__banner">{{ message }}</ev-alert>
+  }
+
+  @if (alertId(); as id) {
+    <p class="recommendations__focus">
+      Alerte n° {{ id }} ·
+      <a routerLink="/recommendations" class="ev-link">Toutes les recommandations</a>
+    </p>
+  }
+
+  <app-recommendation-list [siteId]="siteFilter()" [alertId]="alertId()" [sites]="sites()" />
+</div>

apps/frontend/src/app/features/recommendations/recommendations.scss

@@ -0,0 +1,59 @@
+:host {
+  display: block;
+  color: var(--color-text);
+  padding: 2.5rem 2rem;
+  max-width: 1100px;
+  margin: 0 auto;
+}
+
+.recommendations__header {
+  display: flex;
+  align-items: center;
+  gap: 0.85rem;
+  margin-bottom: 2rem;
+
+  h1 {
+    margin: 0;
+    font-size: 1.75rem;
+    font-weight: 700;
+  }
+}
+
+.recommendations__logo {
+  font-size: 1.3rem;
+}
+
+.recommendations__subtitle {
+  margin: 0.25rem 0 0;
+  color: var(--color-text-muted);
+}
+
+.recommendations__toolbar {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: flex-end;
+  justify-content: space-between;
+  gap: var(--space-3);
+  margin-bottom: var(--space-4);
+}
+
+.recommendations__filter {
+  display: flex;
+  flex-direction: column;
+  min-width: 14rem;
+
+  .form-label {
+    margin-top: 0;
+  }
+}
+
+.recommendations__banner {
+  display: block;
+  margin-bottom: var(--space-3);
+}
+
+.recommendations__focus {
+  margin: 0 0 var(--space-3);
+  font-size: 0.9rem;
+  color: var(--color-text-muted);
+}

apps/frontend/src/app/features/recommendations/recommendations.spec.ts

@@ -0,0 +1,169 @@
+import { TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+import { ActivatedRoute, convertToParamMap, provideRouter } from '@angular/router';
+import { vi } from 'vitest';
+import { BehaviorSubject, of, throwError } from 'rxjs';
+import { RecommendationsView, parseAlertId } from './recommendations';
+import { RecommendationList } from '../../shared/components/recommendation-list/recommendation-list';
+import { SitesService } from '../../core/services/sites.service';
+import { AlertsService } from '../../core/services/alerts.service';
+import { RecommendationsService } from '../../core/services/recommendations.service';
+import { AuthService } from '../../core/services/auth.service';
+
+const SITES = [
+  {
+    site_id: 'SITE001',
+    site_name: 'Usine Nantes',
+    site_type: 'industriel',
+    location: 'Nantes',
+    capacity_kw: 500,
+    status: 'actif',
+  },
+];
+
+const BILAN = { alerts_examined: 2, recommendations_created: 3, already_present: 1 };
+
+function setup(options: { query?: Record<string, string>; role?: string } = {}) {
+  const query = options.query ?? {};
+  const queryParamMap = new BehaviorSubject(convertToParamMap(query));
+  const generate = vi.fn().mockReturnValue(of(BILAN));
+  const getRecommendations = vi.fn().mockReturnValue(of([]));
+  const getAlerts = vi.fn().mockReturnValue(of([]));
+  TestBed.configureTestingModule({
+    imports: [RecommendationsView],
+    providers: [
+      provideRouter([]),
+      {
+        provide: ActivatedRoute,
+        useValue: { queryParamMap, snapshot: { queryParamMap: convertToParamMap(query) } },
+      },
+      { provide: SitesService, useValue: { getSites: vi.fn().mockReturnValue(of(SITES)) } },
+      { provide: AlertsService, useValue: { getAlerts } },
+      { provide: RecommendationsService, useValue: { getRecommendations, generate } },
+      {
+        provide: AuthService,
+        useValue: { principal: vi.fn().mockReturnValue({ role: options.role ?? 'lecteur' }) },
+      },
+    ],
+  });
+  const fixture = TestBed.createComponent(RecommendationsView);
+  fixture.detectChanges();
+  fixture.detectChanges();
+  return { fixture, queryParamMap, generate, getRecommendations, getAlerts };
+}
+
+function listeEnfant(fixture: ReturnType<typeof setup>['fixture']): RecommendationList {
+  return fixture.debugElement.query(By.directive(RecommendationList)).componentInstance;
+}
+
+describe('parseAlertId', () => {
+  it("n'accepte qu'un entier strictement positif", () => {
+    expect(parseAlertId('12')).toBe(12);
+    expect(parseAlertId('0')).toBeNull();
+    expect(parseAlertId('-3')).toBeNull();
+    expect(parseAlertId('abc')).toBeNull();
+    expect(parseAlertId('12abc')).toBeNull();
+    expect(parseAlertId(null)).toBeNull();
+  });
+});
+
+describe('RecommendationsView', () => {
+  it("cible l'alerte donnée par ?alert= et la transmet à la liste", () => {
+    const { fixture } = setup({ query: { alert: '12' } });
+
+    expect(fixture.componentInstance.alertId()).toBe(12);
+    expect(listeEnfant(fixture).alertId()).toBe(12);
+    expect(fixture.nativeElement.textContent).toContain('Alerte n° 12');
+    expect(fixture.nativeElement.querySelector('a[href="/recommendations"]')).not.toBeNull();
+  });
+
+  it('ignore un paramètre alert invalide', () => {
+    const { fixture } = setup({ query: { alert: 'abc' } });
+
+    expect(fixture.componentInstance.alertId()).toBeNull();
+    expect(fixture.nativeElement.textContent).not.toContain('Alerte n°');
+  });
+
+  it('applique le site donné par ?site= au filtre et à la liste', () => {
+    const { fixture, getAlerts } = setup({ query: { site: 'SITE001' } });
+
+    expect(getAlerts).toHaveBeenCalledWith({ site_id: 'SITE001' });
+    const option = fixture.nativeElement.querySelector(
+      'option[value="SITE001"]',
+    ) as HTMLOptionElement;
+    expect(option.selected).toBe(true);
+  });
+
+  it('relance la liste sur le site choisi dans le filtre', () => {
+    const { fixture, getAlerts } = setup();
+    const select = fixture.nativeElement.querySelector(
+      '[data-testid="site-filter"]',
+    ) as HTMLSelectElement;
+
+    select.value = 'SITE001';
+    select.dispatchEvent(new Event('change'));
+    fixture.detectChanges();
+    fixture.detectChanges();
+
+    expect(getAlerts).toHaveBeenLastCalledWith({ site_id: 'SITE001' });
+    expect(listeEnfant(fixture).siteId()).toBe('SITE001');
+  });
+
+  it('cache le bouton de génération aux lecteurs', () => {
+    const { fixture } = setup({ role: 'lecteur' });
+
+    expect(fixture.nativeElement.querySelector('[data-testid="generate"]')).toBeNull();
+  });
+
+  it('permet à un admin de générer pour le site filtré, affiche le bilan et recharge la liste', () => {
+    const { fixture, generate, getRecommendations } = setup({
+      role: 'admin',
+      query: { site: 'SITE001' },
+    });
+
+    fixture.nativeElement.querySelector('[data-testid="generate"]').click();
+    fixture.detectChanges();
+    fixture.detectChanges();
+
+    expect(generate).toHaveBeenCalledWith('SITE001');
+    expect(fixture.nativeElement.textContent).toContain(
+      '3 recommandations créées, 1 déjà présente, 2 alertes examinées.',
+    );
+    expect(getRecommendations).toHaveBeenCalledTimes(2);
+    expect(fixture.componentInstance.generating()).toBe(false);
+  });
+
+  it('génère pour tout le parc quand aucun site n’est filtré', () => {
+    const { fixture, generate } = setup({ role: 'admin' });
+
+    fixture.componentInstance.onGenerate();
+
+    expect(generate).toHaveBeenCalledWith(undefined);
+  });
+
+  it("signale l'échec de la génération sans casser la page", () => {
+    const { fixture, generate } = setup({ role: 'admin' });
+    generate.mockReturnValue(throwError(() => new Error('403')));
+
+    fixture.componentInstance.onGenerate();
+    fixture.detectChanges();
+
+    expect(fixture.componentInstance.generationError()).not.toBeNull();
+    expect(fixture.nativeElement.textContent).toContain(
+      'La génération des recommandations a échoué',
+    );
+    expect(fixture.componentInstance.generating()).toBe(false);
+  });
+
+  it('accorde le bilan au singulier', () => {
+    const { fixture } = setup();
+
+    expect(
+      fixture.componentInstance.bilan({
+        alerts_examined: 1,
+        recommendations_created: 1,
+        already_present: 0,
+      }),
+    ).toBe('1 recommandation créée, 0 déjà présente, 1 alerte examinée');
+  });
+});

apps/frontend/src/app/features/recommendations/recommendations.ts

@@ -0,0 +1,85 @@
+import { Component, computed, inject, signal, viewChild } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { ActivatedRoute, RouterLink } from '@angular/router';
+import { catchError, map, of } from 'rxjs';
+import { SitesService } from '../../core/services/sites.service';
+import { RecommendationsService } from '../../core/services/recommendations.service';
+import { AuthService } from '../../core/services/auth.service';
+import { Site } from '../../shared/models/site.model';
+import { RecommendationGenerationReport } from '../../shared/models/recommendation.model';
+import { RecommendationList } from '../../shared/components/recommendation-list/recommendation-list';
+import { Alert as EvAlert } from '../../shared/components/ui/alert/alert';
+import { Brand } from '../../shared/components/ui/brand/brand';
+import { Button } from '../../shared/components/ui/button/button';
+
+const GENERATION_FAILED_MESSAGE =
+  'La génération des recommandations a échoué, réessayez plus tard.';
+
+export function parseAlertId(raw: string | null): number | null {
+  return raw !== null && /^[1-9]\d*$/.test(raw) ? Number(raw) : null;
+}
+
+function pluriel(nombre: number, singulier: string, plurielForme: string): string {
+  return `${nombre} ${nombre > 1 ? plurielForme : singulier}`;
+}
+
+@Component({
+  selector: 'app-recommendations',
+  standalone: true,
+  imports: [RouterLink, RecommendationList, EvAlert, Brand, Button],
+  templateUrl: './recommendations.html',
+  styleUrl: './recommendations.scss',
+})
+export class RecommendationsView {
+  private route = inject(ActivatedRoute);
+  private sitesService = inject(SitesService);
+  private recommendationsService = inject(RecommendationsService);
+  private auth = inject(AuthService);
+
+  alertId = toSignal(
+    this.route.queryParamMap.pipe(map((params) => parseAlertId(params.get('alert')))),
+    { initialValue: null },
+  );
+  siteFilter = signal<string | null>(this.route.snapshot.queryParamMap.get('site'));
+  sites = toSignal(this.sitesService.getSites().pipe(catchError(() => of([] as Site[]))), {
+    initialValue: [] as Site[],
+  });
+
+  list = viewChild.required(RecommendationList);
+
+  isAdmin = computed(() => this.auth.principal()?.role === 'admin');
+  generating = signal(false);
+  generationReport = signal<RecommendationGenerationReport | null>(null);
+  generationError = signal<string | null>(null);
+
+  onSiteChange(event: Event): void {
+    this.siteFilter.set((event.target as HTMLSelectElement).value || null);
+  }
+
+  onGenerate(): void {
+    if (this.generating()) {
+      return;
+    }
+    this.generating.set(true);
+    this.generationError.set(null);
+    this.recommendationsService.generate(this.siteFilter() ?? undefined).subscribe({
+      next: (report) => {
+        this.generating.set(false);
+        this.generationReport.set(report);
+        this.list().reload();
+      },
+      error: () => {
+        this.generating.set(false);
+        this.generationError.set(GENERATION_FAILED_MESSAGE);
+      },
+    });
+  }
+
+  bilan(report: RecommendationGenerationReport): string {
+    return [
+      pluriel(report.recommendations_created, 'recommandation créée', 'recommandations créées'),
+      pluriel(report.already_present, 'déjà présente', 'déjà présentes'),
+      pluriel(report.alerts_examined, 'alerte examinée', 'alertes examinées'),
+    ].join(', ');
+  }
+}

apps/frontend/src/app/features/sites/site-detail/site-detail.html

@@ -81,5 +81,16 @@
     }
   }
 
+  <section class="recommendations-section">
+    <h2>Recommandations</h2>
+    <app-recommendation-list [siteId]="siteId() ?? null" [sites]="siteAsList()" />
+    <a
+      routerLink="/recommendations"
+      [queryParams]="{ site: siteId() }"
+      class="ev-link recommendations-section__link"
+      >Voir dans la vue recommandations</a
+    >
+  </section>
+
   <a routerLink="/sites" class="ev-link">Retour aux sites</a>
 </div>

apps/frontend/src/app/features/sites/site-detail/site-detail.scss

@@ -117,3 +117,12 @@ h2 {
 .chart-section {
   margin-bottom: 2rem;
 }
+
+.recommendations-section {
+  margin: 2.5rem 0 1.5rem;
+}
+
+.recommendations-section__link {
+  display: inline-block;
+  margin-top: 1rem;
+}

apps/frontend/src/app/features/sites/site-detail/site-detail.spec.ts

@@ -5,6 +5,8 @@ import { BehaviorSubject, of, throwError } from 'rxjs';
 import { SiteDetail } from './site-detail';
 import { SitesService } from '../../../core/services/sites.service';
 import { ReadingsService } from '../../../core/services/readings.service';
+import { AlertsService } from '../../../core/services/alerts.service';
+import { RecommendationsService } from '../../../core/services/recommendations.service';
 
 const SITE = {
   site_id: 'SITE001',
@@ -69,6 +71,7 @@ function setup(
   readingsMock: Partial<ReadingsService>,
 ) {
   const paramMap = new BehaviorSubject(convertToParamMap({ siteId }));
+  const getAlerts = vi.fn().mockReturnValue(of([]));
   TestBed.configureTestingModule({
     imports: [SiteDetail],
     providers: [
@@ -76,9 +79,14 @@ function setup(
       { provide: ActivatedRoute, useValue: { paramMap } },
       { provide: SitesService, useValue: sitesMock },
       { provide: ReadingsService, useValue: readingsMock },
+      { provide: AlertsService, useValue: { getAlerts } },
+      {
+        provide: RecommendationsService,
+        useValue: { getRecommendations: vi.fn().mockReturnValue(of([])) },
+      },
     ],
   });
-  return { fixture: TestBed.createComponent(SiteDetail), paramMap };
+  return { fixture: TestBed.createComponent(SiteDetail), paramMap, getAlerts };
 }
 
 describe('SiteDetail', () => {
@@ -261,6 +269,27 @@ describe('SiteDetail', () => {
     );
   });
 
+  it('demande les recommandations du site consulté à travers ses alertes', () => {
+    const { fixture, getAlerts } = setup(
+      'SITE001',
+      {
+        getSite: vi.fn().mockReturnValue(of(SITE)),
+        getCurrent: vi.fn().mockReturnValue(of(CURRENT_COMPLET)),
+      },
+      { getHistory: vi.fn().mockReturnValue(of([])) },
+    );
+
+    fixture.detectChanges();
+    fixture.detectChanges();
+
+    expect(getAlerts).toHaveBeenCalledWith({ site_id: 'SITE001' });
+    expect(fixture.nativeElement.querySelector('app-recommendation-list')).not.toBeNull();
+    expect(fixture.nativeElement.textContent).toContain('Recommandations');
+    expect(
+      fixture.nativeElement.querySelector('a[href="/recommendations?site=SITE001"]'),
+    ).not.toBeNull();
+  });
+
   it("annonce l'absence de mesure sans interroger l'historique quand timestamp est null", () => {
     const getHistory = vi.fn().mockReturnValue(of([]));
     const { fixture } = setup(

apps/frontend/src/app/features/sites/site-detail/site-detail.ts

@@ -13,6 +13,7 @@ import { Badge, BadgeTone } from '../../../shared/components/ui/badge/badge';
 import { Brand } from '../../../shared/components/ui/brand/brand';
 import { ConsumptionGauge } from '../../../shared/components/consumption-gauge/consumption-gauge';
 import { ReadingHistoryChart } from '../../../shared/components/reading-history-chart/reading-history-chart';
+import { RecommendationList } from '../../../shared/components/recommendation-list/recommendation-list';
 
 const UNAVAILABLE_MESSAGE = 'Détail du site indisponible, réessayez plus tard.';
 const NO_MEASUREMENT_MESSAGE = 'Aucune mesure remontée pour ce site.';
@@ -96,7 +97,16 @@ export interface MetricView {
 @Component({
   selector: 'app-site-detail',
   standalone: true,
-  imports: [RouterLink, Card, Alert, Badge, Brand, ConsumptionGauge, ReadingHistoryChart],
+  imports: [
+    RouterLink,
+    Card,
+    Alert,
+    Badge,
+    Brand,
+    ConsumptionGauge,
+    ReadingHistoryChart,
+    RecommendationList,
+  ],
   templateUrl: './site-detail.html',
   styleUrl: './site-detail.scss',
 })
@@ -117,6 +127,11 @@ export class SiteDetail {
 
   hasMeasurement = computed(() => this.current()?.timestamp != null);
 
+  siteAsList = computed<Site[]>(() => {
+    const site = this.site();
+    return site ? [site] : [];
+  });
+
   consumptionKw = computed(() => this.current()?.consumption_kw ?? null);
 
   consumptionLabel = computed(() => {

apps/frontend/src/app/shared/components/recommendation-list/recommendation-list.html

@@ -0,0 +1,48 @@
+@if (error(); as message) {
+  <ev-alert severity="danger" class="reco-list__banner">{{ message }}</ev-alert>
+} @else if (loading() && !hasData()) {
+  <p class="reco-list__state" aria-live="polite">Chargement des recommandations…</p>
+} @else if (visibleGroups().length === 0) {
+  <ev-alert severity="success" class="reco-list__banner">{{ emptyMessage() }}</ev-alert>
+}
+
+<div class="reco-list" [attr.aria-busy]="loading()">
+  @for (group of visibleGroups(); track group.alert.alert_id) {
+    <ev-card
+      class="reco-group"
+      [class.reco-group--focus]="group.alert.alert_id === alertId()"
+      [id]="'alerte-' + group.alert.alert_id"
+    >
+      <header class="reco-group__alert">
+        <div class="reco-group__meta">
+          <ev-badge [tone]="toneFor(group.alert.severity)">{{
+            severityLabel(group.alert.severity)
+          }}</ev-badge>
+          <span class="reco-group__type">{{ typeLabel(group.alert.type) }}</span>
+          @if (!siteId()) {
+            <a [routerLink]="['/sites', group.alert.site_id]" class="ev-link">{{
+              group.siteName
+            }}</a>
+          }
+          <time [attr.datetime]="group.alert.timestamp">{{
+            group.alert.timestamp | date: 'dd/MM/yyyy HH:mm'
+          }}</time>
+        </div>
+        <p class="reco-group__message">{{ group.alert.message }}</p>
+      </header>
+      <ol class="reco-group__items">
+        @for (reco of group.recommendations; track reco.recommendation_id) {
+          <li class="reco">
+            <div class="reco__head">
+              <strong class="reco__action">{{ reco.action }}</strong>
+              <ev-badge [tone]="ruleTone(reco.rule_reference)">{{
+                ruleLabel(reco.rule_reference)
+              }}</ev-badge>
+            </div>
+            <p class="reco__explanation">{{ reco.explanation }}</p>
+          </li>
+        }
+      </ol>
+    </ev-card>
+  }
+</div>

apps/frontend/src/app/shared/components/recommendation-list/recommendation-list.scss

@@ -0,0 +1,94 @@
+:host {
+  display: block;
+}
+
+.reco-list__banner {
+  display: block;
+  margin-bottom: var(--space-3);
+}
+
+.reco-list__state {
+  margin: 0 0 var(--space-3);
+  font-size: 0.9rem;
+  color: var(--color-text-muted);
+}
+
+.reco-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-3);
+}
+
+.reco-group {
+  padding: var(--space-4);
+  gap: var(--space-3);
+}
+
+.reco-group--focus {
+  border-color: var(--color-primary);
+  box-shadow: 0 0 0 3px var(--color-primary-light);
+}
+
+.reco-group__alert {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-1);
+  padding-bottom: var(--space-3);
+  border-bottom: 1px solid var(--color-border-light);
+}
+
+.reco-group__meta {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--space-2);
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+}
+
+.reco-group__type {
+  font-weight: 600;
+  color: var(--color-text);
+}
+
+.reco-group__message {
+  margin: 0;
+  font-size: 0.9rem;
+}
+
+.reco-group__items {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-2);
+}
+
+.reco {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+  padding: var(--space-2) var(--space-3);
+  border-radius: var(--radius-sm);
+  background: var(--color-bg);
+  border-left: 3px solid var(--color-primary);
+}
+
+.reco__head {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-2);
+}
+
+.reco__action {
+  font-size: 0.95rem;
+}
+
+.reco__explanation {
+  margin: 0;
+  font-size: 0.85rem;
+  color: var(--color-text-muted);
+}

apps/frontend/src/app/shared/components/recommendation-list/recommendation-list.spec.ts

@@ -0,0 +1,244 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { provideRouter } from '@angular/router';
+import { vi } from 'vitest';
+import { NEVER, of, throwError } from 'rxjs';
+import { RecommendationList, joinByAlert } from './recommendation-list';
+import { AlertsService } from '../../../core/services/alerts.service';
+import { RecommendationsService } from '../../../core/services/recommendations.service';
+import { Alert } from '../../models/alert.model';
+import { Recommendation } from '../../models/recommendation.model';
+import { Site } from '../../models/site.model';
+
+const SITES: Site[] = [
+  {
+    site_id: 'SITE001',
+    site_name: 'Usine Nantes',
+    site_type: 'industriel',
+    location: 'Nantes',
+    capacity_kw: 500,
+    status: 'actif',
+  },
+  {
+    site_id: 'SITE002',
+    site_name: 'Bureau Lille',
+    site_type: 'bureau',
+    location: 'Lille',
+    capacity_kw: 80,
+    status: 'actif',
+  },
+];
+
+function alerte(surcharges: Partial<Alert>): Alert {
+  return {
+    alert_id: 1,
+    site_id: 'SITE001',
+    timestamp: '2026-09-15T09:00:00Z',
+    type: 'threshold',
+    severity: 'high',
+    message: 'Puissance appelée au-dessus de la capacité du site',
+    value: 812.5,
+    threshold: 720,
+    metric: 'consumption_kw',
+    prediction_id: null,
+    ...surcharges,
+  };
+}
+
+function reco(surcharges: Partial<Recommendation>): Recommendation {
+  return {
+    recommendation_id: 1,
+    alert_id: 1,
+    action: 'Ramener la puissance appelée sous le seuil contractuel',
+    explanation: 'Seuil de consommation dépassé sur le site SITE001.',
+    rule_reference: 'threshold-reduction-v1',
+    created_at: '2026-09-15T09:05:00Z',
+    ...surcharges,
+  };
+}
+
+const ALERTES: Alert[] = [
+  alerte({ alert_id: 1, site_id: 'SITE001', timestamp: '2026-09-15T09:00:00Z' }),
+  alerte({
+    alert_id: 2,
+    site_id: 'SITE002',
+    timestamp: '2026-09-15T11:00:00Z',
+    severity: 'critical',
+    type: 'spike',
+    message: 'Variation brutale entre deux lectures consécutives',
+  }),
+  alerte({ alert_id: 3, site_id: 'SITE001', timestamp: '2026-09-15T10:00:00Z', severity: 'low' }),
+];
+
+const RECOMMANDATIONS: Recommendation[] = [
+  reco({
+    recommendation_id: 3,
+    alert_id: 2,
+    action: "Escalader à l'astreinte sous une heure",
+    rule_reference: 'escalade-astreinte-v1',
+  }),
+  reco({ recommendation_id: 1, alert_id: 1 }),
+  reco({
+    recommendation_id: 2,
+    alert_id: 2,
+    action: 'Délester les équipements non prioritaires sur le créneau du pic',
+    rule_reference: 'spike-delestage-v1',
+  }),
+  reco({ recommendation_id: 4, alert_id: 99, rule_reference: 'orpheline-v1' }),
+];
+
+function setup(
+  alertsMock: { getAlerts: ReturnType<typeof vi.fn> },
+  recosMock: { getRecommendations: ReturnType<typeof vi.fn> },
+  inputs: Record<string, unknown> = {},
+) {
+  TestBed.configureTestingModule({
+    imports: [RecommendationList],
+    providers: [
+      provideRouter([]),
+      { provide: AlertsService, useValue: alertsMock },
+      { provide: RecommendationsService, useValue: recosMock },
+    ],
+  });
+  const fixture = TestBed.createComponent(RecommendationList);
+  for (const [nom, valeur] of Object.entries(inputs)) {
+    fixture.componentRef.setInput(nom, valeur);
+  }
+  return fixture;
+}
+
+function rendre(fixture: ComponentFixture<RecommendationList>) {
+  fixture.detectChanges();
+  fixture.detectChanges();
+}
+
+function texte(fixture: ComponentFixture<RecommendationList>): string {
+  return (fixture.nativeElement as HTMLElement).textContent ?? '';
+}
+
+const recosOk = () => ({ getRecommendations: vi.fn().mockReturnValue(of(RECOMMANDATIONS)) });
+
+describe('joinByAlert', () => {
+  it('groupe par alerte, du plus récent au plus ancien, recommandations par identifiant', () => {
+    const groupes = joinByAlert(ALERTES, RECOMMANDATIONS, new Map([['SITE001', 'Usine Nantes']]));
+
+    expect(groupes.map((g) => g.alert.alert_id)).toEqual([2, 1]);
+    expect(groupes[0].recommendations.map((r) => r.recommendation_id)).toEqual([2, 3]);
+    expect(groupes[1].siteName).toBe('Usine Nantes');
+    expect(groupes[0].siteName).toBe('SITE002');
+  });
+
+  it('ignore les alertes sans recommandation et les recommandations orphelines', () => {
+    const groupes = joinByAlert(ALERTES, RECOMMANDATIONS, new Map());
+
+    expect(groupes.some((g) => g.alert.alert_id === 3)).toBe(false);
+    expect(groupes.flatMap((g) => g.recommendations).some((r) => r.alert_id === 99)).toBe(false);
+  });
+});
+
+describe('RecommendationList', () => {
+  it('charge alertes et recommandations puis affiche les groupes avec leur contexte', () => {
+    const getAlerts = vi.fn().mockReturnValue(of(ALERTES));
+    const fixture = setup({ getAlerts }, recosOk(), { sites: SITES });
+
+    rendre(fixture);
+
+    expect(getAlerts).toHaveBeenCalledWith({});
+    expect(fixture.nativeElement.querySelectorAll('.reco-group').length).toBe(2);
+    const contenu = texte(fixture);
+    expect(contenu).toContain('Usine Nantes');
+    expect(contenu).toContain('Bureau Lille');
+    expect(contenu).toContain('Critique');
+    expect(contenu).toContain('Pic de consommation');
+    expect(contenu).toContain('Escalade astreinte');
+    expect(contenu).toContain('Délester les équipements');
+    expect(contenu).toContain('15/09/2026');
+    expect(fixture.nativeElement.querySelector('a[href="/sites/SITE002"]')).not.toBeNull();
+    expect(fixture.componentInstance.total()).toBe(3);
+    expect(fixture.componentInstance.error()).toBeNull();
+  });
+
+  it('filtre les alertes du site côté API et masque le lien vers le site', () => {
+    const getAlerts = vi.fn().mockReturnValue(of(ALERTES.filter((a) => a.site_id === 'SITE001')));
+    const fixture = setup({ getAlerts }, recosOk(), { siteId: 'SITE001', sites: SITES });
+
+    rendre(fixture);
+
+    expect(getAlerts).toHaveBeenCalledWith({ site_id: 'SITE001' });
+    expect(fixture.nativeElement.querySelectorAll('.reco-group').length).toBe(1);
+    expect(fixture.nativeElement.querySelector('a[href^="/sites/"]')).toBeNull();
+  });
+
+  it("ne garde que le groupe de l'alerte ciblée et le met en évidence", () => {
+    const fixture = setup({ getAlerts: vi.fn().mockReturnValue(of(ALERTES)) }, recosOk(), {
+      alertId: 2,
+    });
+
+    rendre(fixture);
+
+    const groupes = fixture.nativeElement.querySelectorAll('.reco-group');
+    expect(groupes.length).toBe(1);
+    expect(groupes[0].classList.contains('reco-group--focus')).toBe(true);
+    expect(groupes[0].id).toBe('alerte-2');
+  });
+
+  it("annonce l'absence de recommandation pour une alerte inconnue", () => {
+    const fixture = setup({ getAlerts: vi.fn().mockReturnValue(of(ALERTES)) }, recosOk(), {
+      alertId: 123,
+    });
+
+    rendre(fixture);
+
+    expect(texte(fixture)).toContain('Aucune recommandation pour cette alerte.');
+  });
+
+  it("annonce l'absence de recommandation pour le site consulté", () => {
+    const fixture = setup(
+      { getAlerts: vi.fn().mockReturnValue(of([])) },
+      { getRecommendations: vi.fn().mockReturnValue(of([])) },
+      { siteId: 'SITE001' },
+    );
+
+    rendre(fixture);
+
+    expect(texte(fixture)).toContain('Aucune recommandation pour ce site.');
+  });
+
+  it("signale l'indisponibilité et n'affiche aucun groupe si un des deux appels échoue", () => {
+    const fixture = setup(
+      { getAlerts: vi.fn().mockReturnValue(of(ALERTES)) },
+      { getRecommendations: vi.fn().mockReturnValue(throwError(() => new Error('nope'))) },
+    );
+
+    rendre(fixture);
+
+    expect(fixture.componentInstance.error()).not.toBeNull();
+    expect(fixture.componentInstance.groups()).toEqual([]);
+    expect(texte(fixture)).toContain('Recommandations indisponibles');
+    expect(fixture.nativeElement.querySelectorAll('.reco-group').length).toBe(0);
+  });
+
+  it('annonce le chargement tant que la réponse ne vient pas', () => {
+    const fixture = setup(
+      { getAlerts: vi.fn().mockReturnValue(NEVER) },
+      { getRecommendations: vi.fn().mockReturnValue(NEVER) },
+    );
+
+    rendre(fixture);
+
+    expect(fixture.componentInstance.loading()).toBe(true);
+    expect(texte(fixture)).toContain('Chargement des recommandations');
+  });
+
+  it('recharge les deux flux à la demande', () => {
+    const getAlerts = vi.fn().mockReturnValue(of(ALERTES));
+    const recos = recosOk();
+    const fixture = setup({ getAlerts }, recos);
+    rendre(fixture);
+
+    fixture.componentInstance.reload();
+    rendre(fixture);
+
+    expect(getAlerts).toHaveBeenCalledTimes(2);
+    expect(recos.getRecommendations).toHaveBeenCalledTimes(2);
+  });
+});

apps/frontend/src/app/shared/components/recommendation-list/recommendation-list.ts

@@ -0,0 +1,163 @@
+import { Component, DestroyRef, computed, inject, input, signal } from '@angular/core';
+import { takeUntilDestroyed, toObservable } from '@angular/core/rxjs-interop';
+import { DatePipe } from '@angular/common';
+import { RouterLink } from '@angular/router';
+import { catchError, EMPTY, forkJoin, Observable, switchMap, tap } from 'rxjs';
+import { AlertsService } from '../../../core/services/alerts.service';
+import { RecommendationsService } from '../../../core/services/recommendations.service';
+import { Alert, AlertSeverity, AlertType } from '../../models/alert.model';
+import { Recommendation } from '../../models/recommendation.model';
+import { Site } from '../../models/site.model';
+import {
+  LIBELLE_PAR_SEVERITE,
+  LIBELLE_PAR_TYPE,
+  TON_PAR_SEVERITE,
+} from '../../models/alert-presentation';
+import { libelleRegle, tonRegle } from '../../models/recommendation-presentation';
+import { Card } from '../ui/card/card';
+import { Badge, BadgeTone } from '../ui/badge/badge';
+import { Alert as EvAlert } from '../ui/alert/alert';
+
+const UNAVAILABLE_MESSAGE = 'Recommandations indisponibles, réessayez plus tard.';
+
+export interface RecommendedAlertView {
+  alert: Alert;
+  siteName: string;
+  recommendations: Recommendation[];
+}
+
+interface Chargement {
+  alerts: Alert[];
+  recommendations: Recommendation[];
+}
+
+// Pourquoi : une recommandation ne porte que alert_id, jamais site_id, et /recommendations n'a
+// aucun filtre ; la jointure se fait ici, en O(alertes), acceptable à la taille du jeu de données.
+export function joinByAlert(
+  alerts: Alert[],
+  recommendations: Recommendation[],
+  siteNames: Map<string, string>,
+): RecommendedAlertView[] {
+  const parAlerte = new Map<number, Recommendation[]>();
+  for (const recommandation of recommendations) {
+    const liste = parAlerte.get(recommandation.alert_id) ?? [];
+    liste.push(recommandation);
+    parAlerte.set(recommandation.alert_id, liste);
+  }
+  return alerts
+    .filter((alert) => parAlerte.has(alert.alert_id))
+    .map((alert) => ({
+      alert,
+      siteName: siteNames.get(alert.site_id) ?? alert.site_id,
+      recommendations: [...(parAlerte.get(alert.alert_id) ?? [])].sort(
+        (a, b) => a.recommendation_id - b.recommendation_id,
+      ),
+    }))
+    .sort((a, b) => Date.parse(b.alert.timestamp) - Date.parse(a.alert.timestamp));
+}
+
+@Component({
+  selector: 'app-recommendation-list',
+  standalone: true,
+  imports: [DatePipe, RouterLink, Card, Badge, EvAlert],
+  templateUrl: './recommendation-list.html',
+  styleUrl: './recommendation-list.scss',
+})
+export class RecommendationList {
+  private alertsService = inject(AlertsService);
+  private recommendationsService = inject(RecommendationsService);
+  private destroyRef = inject(DestroyRef);
+
+  siteId = input<string | null>(null);
+  alertId = input<number | null>(null);
+  sites = input<Site[]>([]);
+
+  private data = signal<Chargement | null>(null);
+  private reloadTick = signal(0);
+  loading = signal(true);
+  error = signal<string | null>(null);
+
+  private trigger = computed(() => ({ siteId: this.siteId(), tick: this.reloadTick() }));
+
+  private siteNameById = computed(
+    () => new Map(this.sites().map((site) => [site.site_id, site.site_name])),
+  );
+
+  hasData = computed(() => this.data() !== null);
+
+  groups = computed<RecommendedAlertView[]>(() => {
+    const data = this.data();
+    return data ? joinByAlert(data.alerts, data.recommendations, this.siteNameById()) : [];
+  });
+
+  visibleGroups = computed(() => {
+    const alertId = this.alertId();
+    const groups = this.groups();
+    return alertId === null ? groups : groups.filter((group) => group.alert.alert_id === alertId);
+  });
+
+  total = computed(() =>
+    this.visibleGroups().reduce((somme, group) => somme + group.recommendations.length, 0),
+  );
+
+  emptyMessage = computed(() => {
+    if (this.alertId() !== null) {
+      return 'Aucune recommandation pour cette alerte.';
+    }
+    return this.siteId()
+      ? 'Aucune recommandation pour ce site.'
+      : 'Aucune recommandation pour le moment.';
+  });
+
+  constructor() {
+    toObservable(this.trigger)
+      .pipe(
+        tap(() => this.loading.set(true)),
+        switchMap(({ siteId }) =>
+          forkJoin({
+            alerts: this.alertsService.getAlerts(siteId ? { site_id: siteId } : {}),
+            recommendations: this.recommendationsService.getRecommendations(),
+          }).pipe(catchError(() => this.reportUnavailable())),
+        ),
+        takeUntilDestroyed(this.destroyRef),
+      )
+      .subscribe((data) => {
+        this.loading.set(false);
+        this.error.set(null);
+        this.data.set(data);
+      });
+  }
+
+  reload(): void {
+    this.reloadTick.update((tick) => tick + 1);
+  }
+
+  toneFor(severity: AlertSeverity): BadgeTone {
+    return TON_PAR_SEVERITE[severity];
+  }
+
+  severityLabel(severity: AlertSeverity): string {
+    return LIBELLE_PAR_SEVERITE[severity];
+  }
+
+  typeLabel(type: AlertType): string {
+    return LIBELLE_PAR_TYPE[type];
+  }
+
+  ruleLabel(reference: string): string {
+    return libelleRegle(reference);
+  }
+
+  ruleTone(reference: string): BadgeTone {
+    return tonRegle(reference);
+  }
+
+  // Piège : vider les données avec l'erreur ; une demi-jointure (alertes sans recommandations,
+  // ou l'inverse) afficherait des groupes faux plutôt que rien.
+  private reportUnavailable(): Observable<never> {
+    this.loading.set(false);
+    this.error.set(UNAVAILABLE_MESSAGE);
+    this.data.set(null);
+    return EMPTY;
+  }
+}

apps/frontend/src/app/shared/models/recommendation-presentation.spec.ts

@@ -0,0 +1,23 @@
+import { libelleRegle, tonRegle } from './recommendation-presentation';
+
+describe('recommendation-presentation', () => {
+  it('traduit les sept règles connues du moteur', () => {
+    expect(libelleRegle('spike-delestage-v1')).toBe('Délestage');
+    expect(libelleRegle('threshold-reduction-v1')).toBe('Réduction de puissance');
+    expect(libelleRegle('outage-secours-v1')).toBe('Alimentation de secours');
+    expect(libelleRegle('sensor-maintenance-v1')).toBe('Maintenance capteur');
+    expect(libelleRegle('anomaly-verification-v1')).toBe('Vérification');
+    expect(libelleRegle('escalade-astreinte-v1')).toBe('Escalade astreinte');
+    expect(libelleRegle('contrat-puissance-v1')).toBe('Contrat de puissance');
+  });
+
+  it('affiche telle quelle une référence de règle inconnue', () => {
+    expect(libelleRegle('spike-delestage-v2')).toBe('spike-delestage-v2');
+  });
+
+  it("réserve le ton critique à l'escalade vers l'astreinte", () => {
+    expect(tonRegle('escalade-astreinte-v1')).toBe('critical');
+    expect(tonRegle('spike-delestage-v1')).toBe('neutral');
+    expect(tonRegle('inconnue-v9')).toBe('neutral');
+  });
+});

apps/frontend/src/app/shared/models/recommendation-presentation.ts

@@ -0,0 +1,23 @@
+import { BadgeTone } from '../components/ui/badge/badge';
+
+// Contrainte : une règle dont le sens change reçoit un suffixe -v2 côté backend (ADR 0006) ;
+// une référence inconnue s'affiche donc telle quelle plutôt que de casser la vue.
+const LIBELLE_PAR_REGLE: Record<string, string> = {
+  'spike-delestage-v1': 'Délestage',
+  'threshold-reduction-v1': 'Réduction de puissance',
+  'outage-secours-v1': 'Alimentation de secours',
+  'sensor-maintenance-v1': 'Maintenance capteur',
+  'anomaly-verification-v1': 'Vérification',
+  'escalade-astreinte-v1': 'Escalade astreinte',
+  'contrat-puissance-v1': 'Contrat de puissance',
+};
+
+const REGLE_ESCALADE = 'escalade-astreinte-v1';
+
+export function libelleRegle(reference: string): string {
+  return LIBELLE_PAR_REGLE[reference] ?? reference;
+}
+
+export function tonRegle(reference: string): BadgeTone {
+  return reference === REGLE_ESCALADE ? 'critical' : 'neutral';
+}

apps/frontend/src/app/shared/models/recommendation.model.ts

@@ -0,0 +1,14 @@
+export interface Recommendation {
+  recommendation_id: number;
+  alert_id: number;
+  action: string;
+  explanation: string;
+  rule_reference: string;
+  created_at: string;
+}
+
+export interface RecommendationGenerationReport {
+  alerts_examined: number;
+  recommendations_created: number;
+  already_present: number;
+}

docs/architecture/30-frontend.md

@@ -146,6 +146,29 @@ Compose.
 
 Conventions et gabarits : [`apps/frontend/TESTING.md`](../../apps/frontend/TESTING.md).
 
+## Recommandations
+
+Statut : `Fait`. La vue `/recommendations` (`features/recommendations`, derrière `authGuard`, tous
+rôles) présente les recommandations du moteur de règles groupées par alerte, du plus récent au plus
+ancien, avec le contexte de l'alerte (sévérité, type, site, horodatage, message) puis chaque action,
+son explication et la règle qui l'a produite.
+
+- **Jointure côté client.** Une recommandation ne porte que `alert_id`, jamais `site_id`, et
+  `GET /recommendations` n'a aucun filtre. `app-recommendation-list` (`shared/components/`) charge
+  donc en parallèle `GET /alerts` (filtré par `site_id` quand un site est fixé) et
+  `GET /recommendations`, puis les joint par `alert_id` (`joinByAlert`, fonction pure testée à
+  part). Les recommandations dont l'alerte n'est pas dans le jeu chargé sont ignorées : c'est ainsi
+  que le filtre site s'applique. `/alerts` n'étant pas paginé, un seul appel suffit.
+- **Paramètres d'URL.** `?site=<site_id>` présélectionne le filtre site ; `?alert=<alert_id>`
+  réduit la vue à une alerte et la met en évidence (entier strictement positif, sinon ignoré).
+- **Génération.** Le bouton « Générer les recommandations » n'apparaît que pour le rôle `admin`
+  (`POST /recommendations/generate?site_id=`, réservé admin côté API) et affiche le bilan renvoyé
+  (créées, déjà présentes, alertes examinées) avant de recharger la liste. La voie normale reste le
+  DAG Airflow `alertes` ([ADR 0008](../adr/0008-airflow-execute-le-code-du-backend.md)).
+- **Entrées.** Lien « Recommandations » dans l'en-tête du tableau de bord ; section
+  « Recommandations » sur la vue détail d'un site (liste restreinte au site, lien vers la vue
+  complète préfiltrée).
+
 ## Questions ouvertes
 
 - **Gestion d'état** : les signaux suffisent aujourd'hui, la question se reposera quand plusieurs