feat(expense-snapshot): load/save snapshot in vendor payment form

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

APP/src/app/features/expense/components/expense-form-dialog/expense-form-dialog.component.html

@@ -5,6 +5,19 @@
 
     <div class="flex-1 min-w-0 grid grid-cols-1 md:grid-cols-2 gap-x-4 gap-y-3">
 
+      <!-- Snapshot tools (vendor mode): quick-load a saved template, or save the current form -->
+      <div *ngIf="showSnapshotTools" class="md:col-span-2 flex flex-wrap items-end gap-2 rounded border border-gray-200 bg-gray-50 p-2">
+        <label class="flex flex-1 min-w-[14rem] flex-col gap-1">範本 / Load from snapshot
+          <kendo-dropdownlist [data]="snapshots" textField="name" valueField="id" [valuePrimitive]="true"
+            [(ngModel)]="selectedSnapshotId" (valueChange)="applySnapshot($event)"
+            [defaultItem]="{ id: null, name: '-- 選擇範本 / Select a saved snapshot --' }">
+          </kendo-dropdownlist>
+        </label>
+        <button kendoButton fillMode="outline" themeColor="primary" type="button"
+          [disabled]="!isValid" (click)="openSnapshotPrompt()"
+          title="Save the current form as a reusable snapshot / 儲存為範本">💾 存為範本 / Save as snapshot</button>
+      </div>
+
       <!-- Continuous entry: keep member/ministry/category/date after each save (on-behalf reimbursement only) -->
       <label *ngIf="showContinueEntry" class="flex items-center gap-2 md:col-span-2">
         <kendo-switch [(ngModel)]="continueEntry"></kendo-switch>
@@ -210,4 +223,20 @@
     <button kendoButton (click)="cancel.emit()">Cancel</button>
     <button kendoButton themeColor="primary" [disabled]="!isValid" (click)="emitSave()">Save</button>
   </kendo-dialog-actions>
+</kendo-dialog>
+
+<!-- Save-as-snapshot name prompt -->
+<kendo-dialog *ngIf="showSnapshotNamePrompt" title="存為範本 / Save as Snapshot" [width]="420" [maxWidth]="'95vw'"
+  (close)="cancelSnapshotPrompt()">
+  <div class="flex flex-col gap-2 p-2">
+    <label class="flex flex-col gap-1">名稱 / Name
+      <kendo-textbox [(ngModel)]="snapshotName" placeholder="e.g. Monthly Rent — Landlord X"></kendo-textbox>
+    </label>
+    <p class="text-xs text-gray-500">費用日期不會存入範本 / The Expense Date is not saved in a snapshot.</p>
+  </div>
+  <kendo-dialog-actions>
+    <button kendoButton (click)="cancelSnapshotPrompt()">Cancel</button>
+    <button kendoButton themeColor="primary" [disabled]="!snapshotName.trim() || snapshotSaving"
+      (click)="saveSnapshot()">{{ snapshotSaving ? '儲存中… / Saving…' : 'Save' }}</button>
+  </kendo-dialog-actions>
 </kendo-dialog>

APP/src/app/features/expense/components/expense-form-dialog/expense-form-dialog.component.ts

@@ -10,6 +10,8 @@ import { DateInputsModule } from '@progress/kendo-angular-dateinputs';
 import { MinistryApiService } from '../../services/ministry-api.service';
 import { ExpenseCategoryApiService } from '../../services/expense-category-api.service';
 import { ExpenseApiService } from '../../services/expense-api.service';
+import { ExpenseSnapshotApiService } from '../../services/expense-snapshot-api.service';
+import { ExpenseSnapshotDto, CreateExpenseSnapshotRequest } from '../../models/expense-snapshot.model';
 import { ExpenseAiService } from '../../services/expense-ai.service';
 import { MemberApiService } from '../../../members/services/member-api.service';
 import { MemberListItemDto, memberDisplayName } from '../../../members/models/member.model';
@@ -64,6 +66,19 @@ export class ExpenseFormDialogComponent implements OnInit, OnDestroy {
   ministries: MinistryDto[] = [];
   groups: ExpenseCategoryGroupDto[] = [];
 
+  /** Saved snapshots (vendor mode only) for the "Load from snapshot" picker. */
+  snapshots: ExpenseSnapshotDto[] = [];
+  /** Picker binding; reset to null after each apply so the same snapshot can be re-picked. */
+  selectedSnapshotId: number | null = null;
+
+  /** "Save as snapshot" name-prompt state. */
+  showSnapshotNamePrompt = false;
+  snapshotName = '';
+  snapshotSaving = false;
+
+  /** Snapshot tools (load/save) are a vendor-payment feature only. */
+  get showSnapshotTools(): boolean { return this.mode === 'vendor'; }
+
   memberResults: MemberOption[] = [];
 
   /** Continuous-entry toggle: keep member/ministry/category/date and the dialog open after each save. */
@@ -116,12 +131,14 @@ export class ExpenseFormDialogComponent implements OnInit, OnDestroy {
     private catApi: ExpenseCategoryApiService,
     private memberApi: MemberApiService,
     private expenseApi: ExpenseApiService,
+    private snapshotApi: ExpenseSnapshotApiService,
     private aiApi: ExpenseAiService,
     private sanitizer: DomSanitizer,
   ) {}
 
   ngOnInit(): void {
     this.ministryApi.getAll().subscribe(m => (this.ministries = m));
+    if (this.showSnapshotTools) this.loadSnapshots();
     this.catApi.getAll(false).subscribe(groups => {
       this.groups = groups;
       // Populate each line's sub-category list once the catalog is loaded (edit mode).
@@ -315,6 +332,71 @@ export class ExpenseFormDialogComponent implements OnInit, OnDestroy {
     this.receiptPdfUrl = null;
   }
 
+  private loadSnapshots(): void {
+    this.snapshotApi.getAll().subscribe(list => (this.snapshots = list));
+  }
+
+  /** Apply a saved snapshot: prefill header + lines, but keep today's Expense Date. */
+  applySnapshot(snapshotId: number | null): void {
+    if (snapshotId == null) return;
+    this.snapshotApi.getById(snapshotId).subscribe(s => {
+      this.form.ministryId = s.ministryId;
+      this.form.description = s.description;
+      this.form.vendorName = s.vendorName ?? '';
+      this.form.checkNumber = s.checkNumber ?? '';
+      // Expense Date is intentionally NOT taken from the snapshot — leave it as-is (today).
+      this.lines = s.lines.map(line => ({
+        categoryGroupId: line.categoryGroupId,
+        subCategoryId: line.subCategoryId,
+        amount: line.amount,
+        description: line.description ?? '',
+        functionalClass: line.functionalClass,
+        subs: this.groups.find(g => g.id === line.categoryGroupId)?.subCategories ?? [],
+      }));
+      if (this.lines.length === 0) this.lines = [this.emptyLine()];
+      this.selectedSnapshotId = null;
+    });
+  }
+
+  /** Open the name prompt for saving the current form as a snapshot (requires a valid form). */
+  openSnapshotPrompt(): void {
+    if (!this.isValid) return;
+    this.snapshotName = '';
+    this.showSnapshotNamePrompt = true;
+  }
+
+  cancelSnapshotPrompt(): void { this.showSnapshotNamePrompt = false; }
+
+  /** Save the current header + lines as a named snapshot (Expense Date is not stored). */
+  saveSnapshot(): void {
+    const name = this.snapshotName.trim();
+    if (!name || this.snapshotSaving) return;
+    const request: CreateExpenseSnapshotRequest = {
+      name,
+      ministryId: this.form.ministryId!,
+      lines: this.lines.map(l => ({
+        categoryGroupId: l.categoryGroupId!,
+        subCategoryId: l.subCategoryId!,
+        amount: l.amount,
+        functionalClass: l.functionalClass,
+        description: l.description.trim() || null,
+      })),
+      description: this.form.description.trim(),
+      vendorName: this.form.vendorName || null,
+      checkNumber: this.form.checkNumber || null,
+      notes: null,
+    };
+    this.snapshotSaving = true;
+    this.snapshotApi.create(request).subscribe({
+      next: () => {
+        this.snapshotSaving = false;
+        this.showSnapshotNamePrompt = false;
+        this.loadSnapshots();
+      },
+      error: () => { this.snapshotSaving = false; },
+    });
+  }
+
   get isValid(): boolean {
     return !!this.form.ministryId
       && this.form.description.trim().length > 0