月次レポート機能を実装し、経費の取り消し・復帰機能を追加。CSV取込画面にドラッグ＆ドロップエリアを実装し、エラーメッセージ表示を追加。金額のカンマ区切り表示を全体に適用。faviconとapple-touch-iconを追加し、404エラーを回避。作業ログをdiary.mdに追記。

expenses/services.py

@@ -1,7 +1,12 @@
 from __future__ import annotations
 
+from collections import defaultdict
+from dataclasses import dataclass
+from datetime import date
 from typing import Iterable
 
+from django.db.models import Count, Sum
+
 from .csv_parsers import get_parser
 from .models import Expense
 
@@ -34,3 +39,74 @@ def import_csv_lines(lines: Iterable[str]) -> CSVImportResult:
         else:
             duplicated += 1
     return CSVImportResult(imported=imported, duplicated=duplicated)
+
+
+@dataclass
+class MonthlyReportResult:
+    target_month: date
+    total_amount: int
+    store_totals: list[dict]
+    category_totals: list[dict]
+    owner_totals: list[dict]
+    unclassified_counts: dict
+
+
+def build_monthly_report(start_date: date, end_date: date) -> MonthlyReportResult:
+    queryset = Expense.objects.filter(
+        is_canceled=False,
+        use_date__gte=start_date,
+        use_date__lt=end_date,
+    )
+    detail_queryset = (
+        queryset.select_related('store', 'expense_category')
+        .order_by('use_date', 'id')
+    )
+    store_details = defaultdict(list)
+    category_details = defaultdict(list)
+    owner_details = defaultdict(list)
+    for expense in detail_queryset:
+        detail = {
+            'use_date': expense.use_date,
+            'description': expense.description,
+            'amount': expense.amount,
+            'note': expense.note,
+        }
+        store_details[expense.store_id].append(detail)
+        category_details[expense.expense_category_id].append(detail)
+        owner_details[expense.owner_type].append(detail)
+    total_amount = queryset.aggregate(total=Sum('amount'))['total'] or 0
+    store_totals = list(
+        queryset.values('store_id', 'store__name')
+        .annotate(total=Sum('amount'), count=Count('id'))
+        .order_by('store__name', 'store_id')
+    )
+    for row in store_totals:
+        row['details'] = store_details.get(row['store_id'], [])
+    category_totals = list(
+        queryset.values('expense_category_id', 'expense_category__name')
+        .annotate(total=Sum('amount'), count=Count('id'))
+        .order_by('expense_category__name', 'expense_category_id')
+    )
+    for row in category_totals:
+        row['details'] = category_details.get(row['expense_category_id'], [])
+    owner_totals = list(
+        queryset.values('owner_type')
+        .annotate(total=Sum('amount'), count=Count('id'))
+        .order_by('owner_type')
+    )
+    for row in owner_totals:
+        row['details'] = owner_details.get(row['owner_type'], [])
+    unclassified_counts = {
+        'store_missing': queryset.filter(store__isnull=True).count(),
+        'category_missing': queryset.filter(expense_category__isnull=True).count(),
+        'owner_pending': queryset.filter(owner_type='pending').count(),
+        'total': queryset.count(),
+    }
+    return MonthlyReportResult(
+        target_month=start_date,
+        total_amount=total_amount,
+        store_totals=store_totals,
+        category_totals=category_totals,
+        owner_totals=owner_totals,
+        unclassified_counts=unclassified_counts,
+    )