测试覆盖率

.sisyphus/notepads/statistics-year-selection/decisions.md

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+# Decisions - Statistics Year Selection Enhancement
+
+## [2026-01-28] Architecture Decisions
+
+### Frontend Implementation Strategy
+
+#### 1. Date Picker Mode Toggle
+- Add a toggle switch in the date picker popup to switch between "按月" (month) and "按年" (year) modes
+- When "按年" selected: use `columns-type="['year']"`
+- When "按月" selected: use `columns-type="['year', 'month']` (current behavior)
+
+#### 2. State Management
+- Add `dateSelectionMode` ref: `'month'` | `'year'`
+- When year-only mode: set `currentMonth = 0` to indicate full year
+- Keep `currentYear` as integer (unchanged)
+- Update `selectedDate` array dynamically based on mode:
+  - Year mode: `['YYYY']`
+  - Month mode: `['YYYY', 'MM']`
+
+#### 3. Display Logic
+- Nav bar title: `currentYear年` when `currentMonth === 0`, else `currentYear年currentMonth月`
+- Chart titles: Update to reflect year or year-month scope
+
+#### 4. API Calls
+- Pass `month: currentMonth.value || 0` to all API calls
+- Backend will handle month=0 as year-only query
+
+### Backend Implementation Strategy
+
+#### 1. Repository Layer Change
+**File**: `Repository/TransactionRecordRepository.cs`
+**Method**: `BuildQuery()` lines 81-86
+
+```csharp
+if (year.HasValue)
+{
+    if (month.HasValue && month.Value > 0)
+    {
+        // Specific month
+        var dateStart = new DateTime(year.Value, month.Value, 1);
+        var dateEnd = dateStart.AddMonths(1);
+        query = query.Where(t => t.OccurredAt >= dateStart && t.OccurredAt < dateEnd);
+    }
+    else
+    {
+        // Entire year
+        var dateStart = new DateTime(year.Value, 1, 1);
+        var dateEnd = new DateTime(year.Value + 1, 1, 1);
+        query = query.Where(t => t.OccurredAt >= dateStart && t.OccurredAt < dateEnd);
+    }
+}
+```
+
+#### 2. Service Layer
+- No changes needed - services already pass month parameter to repository
+- Services will receive month=0 for year-only queries
+
+#### 3. API Controller
+- No changes needed - already accepts year/month parameters
+
+### Testing Strategy
+
+#### Backend Tests
+- Test year-only query returns all transactions for that year
+- Test month-specific query still works
+- Test edge cases: year boundaries, leap years
+
+#### Frontend Tests
+- Test toggle switches picker mode correctly
+- Test year selection updates state and fetches data
+- Test display updates correctly for year vs year-month
+
+### User Experience Flow
+
+1. User clicks date picker in nav bar
+2. Popup opens with toggle: "按月 | 按年"
+3. User selects mode (default: 按月 for backward compatibility)
+4. User selects date(s) and confirms
+5. Statistics refresh with new scope
+6. Display updates to show scope (year or year-month)