Add selection functionality to product list with delete option

client/src/app/components/ps-product-crud/ps-product-crud.component.html

@@ -7,6 +7,16 @@
       <mat-icon>add</mat-icon>&nbsp;Nouveau produit
     </button>
 
+    @if (selection.hasValue()) {
+      <button
+        mat-raised-button
+        color="warn"
+        (click)="deleteSelected()"
+        [disabled]="isLoading">
+        <mat-icon>delete</mat-icon>&nbsp;Supprimer la sélection
+      </button>
+    }
+
     <mat-form-field appearance="outline" class="filter">
       <mat-label>Filtrer</mat-label>
       <input matInput
@@ -15,15 +25,36 @@
              [disabled]="isLoading">
     </mat-form-field>
   </div>
-
   <div class="mat-elevation-z2 product-list-root">
-    <!-- Overlay de chargement -->
-    <div class="product-list-loading-overlay" *ngIf="isLoading">
+    @if (isLoading) {
+      <div class="product-list-loading-overlay">
         <mat-spinner diameter="48"></mat-spinner>
       </div>
+    }
 
     <table mat-table [dataSource]="dataSource" matSort>
 
+      <!-- select column -->
+      <ng-container matColumnDef="select">
+        <th mat-header-cell *matHeaderCellDef>
+          <mat-checkbox
+            [checked]="isAllSelected()"
+            [indeterminate]="isAnySelected() && !isAllSelected()"
+            (change)="masterToggle($event.checked)"
+            [disabled]="isLoading">
+          </mat-checkbox>
+        </th>
+        <td mat-cell *matCellDef="let el">
+          <mat-checkbox
+            [checked]="selection.isSelected(el)"
+            (change)="toggleSelection(el, $event.checked)"
+            [disabled]="isLoading">
+          </mat-checkbox>
+        </td>
+      </ng-container>
+
+      <!-- existing columns follow (id, name, ...) -->
+
       <ng-container matColumnDef="id">
         <th mat-header-cell *matHeaderCellDef mat-sort-header>ID</th>
         <td mat-cell *matCellDef="let el">{{ el.id }}</td>

client/src/app/components/ps-product-crud/ps-product-crud.component.ts

@@ -11,10 +11,12 @@ import {MatFormField, MatLabel} from '@angular/material/form-field';
 import {MatInput} from '@angular/material/input';
 import {MatButton, MatIconButton} from '@angular/material/button';
 import {MatIcon} from '@angular/material/icon';
-import {FormBuilder, ReactiveFormsModule} from '@angular/forms';
+import {FormBuilder, ReactiveFormsModule, FormsModule} from '@angular/forms';
 import {MatDialog, MatDialogModule} from '@angular/material/dialog';
 import {MatProgressSpinnerModule} from '@angular/material/progress-spinner';
 import {forkJoin, finalize} from 'rxjs';
+import {SelectionModel} from '@angular/cdk/collections';
+import {MatCheckboxModule} from '@angular/material/checkbox';
 
 import {PsItem} from '../../interfaces/ps-item';
 import {ProductListItem} from '../../interfaces/product-list-item';
@@ -27,14 +29,15 @@ import {ProductDialogData, PsProductDialogComponent} from '../ps-product-dialog/
   templateUrl: './ps-product-crud.component.html',
   styleUrls: ['./ps-product-crud.component.css'],
   imports: [
-    CommonModule, ReactiveFormsModule,
+    CommonModule, ReactiveFormsModule, FormsModule,
     MatTable, MatColumnDef, MatHeaderRow, MatHeaderRowDef, MatRow, MatRowDef,
     MatHeaderCell, MatHeaderCellDef, MatCell, MatCellDef, MatNoDataRow,
     MatSortModule, MatPaginatorModule,
     MatFormField, MatLabel, MatInput,
     MatButton, MatIconButton, MatIcon,
     MatDialogModule,
-    MatProgressSpinnerModule
+    MatProgressSpinnerModule,
+    MatCheckboxModule
   ]
 })
 export class PsProductCrudComponent implements OnInit {
@@ -50,12 +53,16 @@ export class PsProductCrudComponent implements OnInit {
   private manMap = new Map<number, string>();
   private supMap = new Map<number, string>();
 
-  displayed: string[] = ['id', 'name', 'category', 'manufacturer', 'supplier', 'priceTtc', 'quantity', 'actions'];
+  // added 'select' column first
+  displayed: string[] = ['select', 'id', 'name', 'category', 'manufacturer', 'supplier', 'priceTtc', 'quantity', 'actions'];
   dataSource = new MatTableDataSource<any>([]);
   @ViewChild(MatPaginator) paginator!: MatPaginator;
   @ViewChild(MatSort) sort!: MatSort;
   @ViewChild(MatTable) table!: MatTable<any>;
 
+  // selection model (multiple)
+  selection = new SelectionModel<any>(true, []);
+
   filterCtrl = this.fb.control<string>('');
 
   isLoading = false;
@@ -121,6 +128,8 @@ export class PsProductCrudComponent implements OnInit {
 
   private bindProducts(p: (ProductListItem & { priceHt?: number })[]) {
     const vat = 0.2;
+    // clear selection because objects will be new after reload
+    this.selection.clear();
     this.dataSource.data = p.map(x => ({
       ...x,
       categoryName: x.id_category_default ? (this.catMap.get(x.id_category_default) ?? '') : '',
@@ -203,4 +212,55 @@ export class PsProductCrudComponent implements OnInit {
         }
       });
   }
+
+  // --- Selection helpers ---
+
+  private getVisibleRows(): any[] {
+    const data = this.dataSource.filteredData || [];
+    if (!this.paginator) return data;
+    const start = this.paginator.pageIndex * this.paginator.pageSize;
+    return data.slice(start, start + this.paginator.pageSize);
+  }
+
+  isAllSelected(): boolean {
+    const visible = this.getVisibleRows();
+    return visible.length > 0 && visible.every(r => this.selection.isSelected(r));
+  }
+
+  isAnySelected(): boolean {
+    return this.selection.hasValue();
+  }
+
+  masterToggle(checked: boolean) {
+    const visible = this.getVisibleRows();
+    if (checked) {
+      visible.forEach(r => this.selection.select(r));
+    } else {
+      visible.forEach(r => this.selection.deselect(r));
+    }
+  }
+
+  toggleSelection(row: any, checked: boolean) {
+    if (checked) this.selection.select(row);
+    else this.selection.deselect(row);
+  }
+
+  deleteSelected() {
+    if (this.isLoading) return;
+    const ids = this.selection.selected.map(s => s.id);
+    if (!ids.length) return;
+    if (!confirm(`Supprimer ${ids.length} produit(s) sélectionné(s) ?`)) return;
+
+    this.isLoading = true;
+    const calls = ids.map((id: number) => this.ps.deleteProduct(id));
+    forkJoin(calls).pipe(finalize(() => {
+      // nothing extra, reload will clear selection
+    })).subscribe({
+      next: () => this.reload(),
+      error: (e: unknown) => {
+        this.isLoading = false;
+        alert('Erreur: ' + (e instanceof Error ? e.message : String(e)));
+      }
+    });
+  }
 }