feat(front-end): multiple file upload

frontend/src/app/features/calculator/components/upload-form/upload-form.component.ts

@@ -1,4 +1,4 @@
-import { Component, input, output, signal } from '@angular/core';
+import { Component, input, output, signal, effect } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ReactiveFormsModule, FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { TranslateModule } from '@ngx-translate/core';
@@ -9,6 +9,11 @@ import { AppButtonComponent } from '../../../../shared/components/app-button/app
 import { StlViewerComponent } from '../../../../shared/components/stl-viewer/stl-viewer.component';
 import { QuoteRequest } from '../../services/quote-estimator.service';
 
+interface FormItem {
+    file: File;
+    quantity: number;
+}
+
 @Component({
   selector: 'app-upload-form',
   standalone: true,
@@ -20,28 +25,53 @@ import { QuoteRequest } from '../../services/quote-estimator.service';
         @if (selectedFile()) {
           <div class="viewer-wrapper">
              <app-stl-viewer [file]="selectedFile()"></app-stl-viewer>
-             <button type="button" class="btn-clear" (click)="clearFiles()">
-                X
+             <button type="button" class="btn-clear-viewer" (click)="selectedFile.set(null)">
+                Close Viewer
              </button>
           </div>
-          <div class="file-list">
-             @for (f of files(); track f.name) {
-                <div class="file-item" [class.active]="f === selectedFile()" (click)="selectFile(f)">
-                   {{ f.name }}
-                </div>
-             }
-          </div>
-        } @else {
-            <app-dropzone 
+        }
+        
+        <!-- Dropzone always available if we want to add more, or hide if list not empty? -->
+        <!-- User wants to "add more", so dropzone should remain or be available -->
+        <app-dropzone 
             [label]="'CALC.UPLOAD_LABEL' | translate" 
             [subtext]="'CALC.UPLOAD_SUB' | translate"
             [accept]="acceptedFormats"
             [multiple]="true"
             (filesDropped)="onFilesDropped($event)">
-            </app-dropzone>
+        </app-dropzone>
+
+        <!-- New File List with Details -->
+        @if (items().length > 0) {
+            <div class="items-list">
+                @for (item of items(); track item.file.name; let i = $index) {
+                    <div class="file-row" [class.active]="item.file === selectedFile()">
+                        <div class="file-info" (click)="selectFile(item.file)">
+                            <span class="file-name">{{ item.file.name }}</span>
+                            <span class="file-size">{{ (item.file.size / 1024 / 1024) | number:'1.1-2' }} MB</span>
+                        </div>
+                        
+                        <div class="file-actions">
+                            <div class="qty-control">
+                                <label>Qtà</label>
+                                <input 
+                                    type="number" 
+                                    min="1" 
+                                    [value]="item.quantity"
+                                    (change)="updateItemQuantity(i, $event)"
+                                    class="qty-input">
+                            </div>
+                            
+                            <button type="button" class="btn-remove" (click)="removeItem(i)" title="Remove file">
+                                X
+                            </button>
+                        </div>
+                    </div>
+                }
+            </div>
         }
         
-        @if (form.get('files')?.invalid && form.get('files')?.touched) {
+        @if (items().length === 0 && form.get('itemsTouched')?.value) {
           <div class="error-msg">{{ 'CALC.ERR_FILE_REQUIRED' | translate }}</div>
         }
       </div>
@@ -60,11 +90,7 @@ import { QuoteRequest } from '../../services/quote-estimator.service';
         ></app-select>
       </div>
       
-      <app-input
-        formControlName="quantity"
-        type="number"
-        [label]="'CALC.QUANTITY' | translate"
-      ></app-input>
+      <!-- Global quantity removed, now per item -->
 
       @if (mode() === 'advanced') {
         <div class="grid">
@@ -113,7 +139,7 @@ import { QuoteRequest } from '../../services/quote-estimator.service';
 
         <app-button 
           type="submit" 
-          [disabled]="form.invalid || loading()" 
+          [disabled]="form.invalid || items().length === 0 || loading()" 
           [fullWidth]="true">
           {{ loading() ? (uploadProgress() < 100 ? 'Uploading...' : 'Processing...') : ('CALC.CALCULATE' | translate) }}
         </app-button>
@@ -127,40 +153,92 @@ import { QuoteRequest } from '../../services/quote-estimator.service';
     .error-msg { color: var(--color-danger-500); font-size: 0.875rem; margin-top: var(--space-2); text-align: center; }
     
     .viewer-wrapper { position: relative; margin-bottom: var(--space-4); }
-    .btn-clear {
+    .btn-clear-viewer {
         position: absolute;
         top: 10px;
         right: 10px;
         background: rgba(0,0,0,0.5);
         color: white;
         border: none;
-        width: 32px;
-        height: 32px;
-        border-radius: 50%;
+        padding: 4px 8px;
+        border-radius: 4px;
         cursor: pointer;
         z-index: 10;
         &:hover { background: rgba(0,0,0,0.7); }
     }
     
-    .file-list {
+    .items-list {
         display: flex;
+        flex-direction: column;
         gap: var(--space-2);
-        overflow-x: auto;
-        padding-bottom: var(--space-2);
+        margin-top: var(--space-4);
     }
-    .file-item {
-        padding: 0.5rem 1rem;
+    
+    .file-row {
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        padding: var(--space-3);
         background: var(--color-neutral-100);
         border: 1px solid var(--color-border);
         border-radius: var(--radius-md);
-        font-size: 0.85rem;
-        cursor: pointer;
-        white-space: nowrap;
-        &:hover { background: var(--color-neutral-200); }
+        transition: all 0.2s;
+        
         &.active {
-            border-color: var(--color-brand); 
-            background: rgba(250, 207, 10, 0.1); 
-            font-weight: 600;
+             border-color: var(--color-brand);
+             background: rgba(250, 207, 10, 0.05);
+        }
+    }
+    
+    .file-info {
+        flex: 1;
+        display: flex;
+        flex-direction: column;
+        cursor: pointer;
+    }
+    .file-name { font-weight: 500; font-size: 0.9rem; color: var(--color-text); }
+    .file-size { font-size: 0.75rem; color: var(--color-text-muted); }
+    
+    .file-actions {
+        display: flex;
+        align-items: center;
+        gap: var(--space-3);
+    }
+    
+    .qty-control {
+        display: flex;
+        align-items: center;
+        gap: var(--space-2);
+        label { font-size: 0.8rem; color: var(--color-text-muted); }
+    }
+    
+    .qty-input {
+        width: 50px;
+        padding: 4px;
+        border: 1px solid var(--color-border);
+        border-radius: var(--radius-sm);
+        text-align: center;
+        font-size: 0.9rem;
+        &:focus { outline: none; border-color: var(--color-brand); }
+    }
+    
+    .btn-remove {
+        width: 28px;
+        height: 28px;
+        border-radius: 50%;
+        border: none;
+        background: transparent; // var(--color-neutral-200);
+        color: var(--color-text-muted); // var(--color-danger-500);
+        font-weight: bold;
+        cursor: pointer;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        transition: all 0.2s;
+        
+        &:hover { 
+            background: var(--color-danger-100); 
+            color: var(--color-danger-500);
         }
     }
 
@@ -185,9 +263,6 @@ import { QuoteRequest } from '../../services/quote-estimator.service';
     /* Progress Bar */
     .progress-container {
         margin-bottom: var(--space-3);
-        /* padding: var(--space-2); */
-        /* background: var(--color-neutral-100); */
-        /* border-radius: var(--radius-md); */
         text-align: center;
         width: 100%;
     }
@@ -206,7 +281,6 @@ import { QuoteRequest } from '../../services/quote-estimator.service';
         width: 0%;
         transition: width 0.2s ease-out;
     }
-    .progress-text { font-size: 0.875rem; color: var(--color-text-muted); }
   `]
 })
 export class UploadFormComponent {
@@ -217,7 +291,7 @@ export class UploadFormComponent {
 
   form: FormGroup;
   
-  files = signal<File[]>([]);
+  items = signal<FormItem[]>([]);
   selectedFile = signal<File | null>(null);
 
   materials = [
@@ -252,10 +326,9 @@ export class UploadFormComponent {
 
   constructor(private fb: FormBuilder) {
     this.form = this.fb.group({
-      files: [[], Validators.required],
+      itemsTouched: [false], // Hack to track touched state for custom items list
       material: ['PLA', Validators.required],
       quality: ['Standard', Validators.required],
-      quantity: [1, [Validators.required, Validators.min(1)]],
       notes: [''],
       // Advanced fields
       color: ['Black'],
@@ -267,14 +340,14 @@ export class UploadFormComponent {
 
   onFilesDropped(newFiles: File[]) {
     const MAX_SIZE = 200 * 1024 * 1024; // 200MB
-    const validFiles: File[] = [];
+    const validItems: FormItem[] = [];
     let hasError = false;
 
     for (const file of newFiles) {
         if (file.size > MAX_SIZE) {
             hasError = true;
         } else {
-            validFiles.push(file);
+            validItems.push({ file, quantity: 1 });
         }
     }
 
@@ -282,32 +355,55 @@ export class UploadFormComponent {
         alert("Alcuni file superano il limite di 200MB e non sono stati aggiunti.");
     }
 
-    if (validFiles.length > 0) {
-        this.files.update(current => [...current, ...validFiles]);
-        this.form.patchValue({ files: this.files() });
-        this.form.get('files')?.markAsTouched();
-        this.selectedFile.set(validFiles[validFiles.length - 1]);
+    if (validItems.length > 0) {
+        this.items.update(current => [...current, ...validItems]);
+        this.form.get('itemsTouched')?.setValue(true);
+        // Auto select last added
+        this.selectedFile.set(validItems[validItems.length - 1].file);
     }
   }
 
   selectFile(file: File) {
-      this.selectedFile.set(file);
+      if (this.selectedFile() === file) {
+          // toggle off? no, keep active
+      } else {
+          this.selectedFile.set(file);
+      }
   }
 
-  clearFiles() {
-      this.files.set([]);
-      this.selectedFile.set(null);
-      this.form.patchValue({ files: [] });
+  updateItemQuantity(index: number, event: Event) {
+      const input = event.target as HTMLInputElement;
+      let val = parseInt(input.value, 10);
+      if (isNaN(val) || val < 1) val = 1;
+      
+      this.items.update(current => {
+          const updated = [...current];
+          updated[index] = { ...updated[index], quantity: val };
+          return updated;
+      });
+  }
+
+  removeItem(index: number) {
+      this.items.update(current => {
+          const updated = [...current];
+          const removed = updated.splice(index, 1)[0];
+          if (this.selectedFile() === removed.file) {
+              this.selectedFile.set(null);
+          }
+          return updated;
+      });
   }
 
   onSubmit() {
-    if (this.form.valid) {
+    if (this.form.valid && this.items().length > 0) {
       this.submitRequest.emit({
+        items: this.items(), // Pass the items array
         ...this.form.value,
         mode: this.mode()
       });
     } else {
       this.form.markAllAsTouched();
+      this.form.get('itemsTouched')?.setValue(true);
     }
   }
 }