feat(app): bug fixed

@@ -10,10 +10,9 @@ DateTime _today() {
 }
 
 class _ReportPeriodAnchor {
-  const _ReportPeriodAnchor({required this.date, this.sourceMonth});
+  const _ReportPeriodAnchor({required this.date});
 
   final DateTime date;
-  final DateTime? sourceMonth;
 }
 
 abstract class ReportPeriodLogic {
@@ -140,13 +139,9 @@ abstract class ReportPeriodLogic {
       return Future.value();
     }
     final nextDate = _dateForPeriodTransition(nextPeriod);
-    final sourceMonth = selectedPeriod.value == ReportPeriod.month &&
-            nextPeriod == ReportPeriod.week
-        ? monthStart
-        : null;
     selectedPeriod.value = nextPeriod;
     selectedDate.value = nextDate;
-    _setAnchorFor(nextPeriod, nextDate, sourceMonth: sourceMonth);
+    _setAnchorFor(nextPeriod, nextDate);
     return loadReport();
   }
 
@@ -253,23 +248,12 @@ abstract class ReportPeriodLogic {
 
   void dispose() {}
 
-  void _setAnchorFor(
-    ReportPeriod period,
-    DateTime date, {
-    DateTime? sourceMonth,
-  }) {
+  void _setAnchorFor(ReportPeriod period, DateTime date) {
     final normalizedPeriod = normalizePeriod(period);
     final normalizedDate = normalizeDate(normalizedPeriod, date);
-    final weekSourceMonth =
-        DateTime(normalizedDate.year, normalizedDate.month);
     _anchor = switch (normalizedPeriod) {
       ReportPeriod.day => _ReportPeriodAnchor(date: normalizedDate),
-      ReportPeriod.week => _ReportPeriodAnchor(
-          date: ReportDateRangeConfig.clampDate(
-            normalizedDate.add(const Duration(days: 6)),
-          ),
-          sourceMonth: sourceMonth ?? weekSourceMonth,
-        ),
+      ReportPeriod.week => _ReportPeriodAnchor(date: normalizedDate),
       ReportPeriod.month => _ReportPeriodAnchor(
           date: ReportDateRangeConfig.clampDate(
             _lastDayOfMonth(normalizedDate),
@@ -284,21 +268,6 @@ abstract class ReportPeriodLogic {
   }
 
   DateTime _dateForPeriodTransition(ReportPeriod nextPeriod) {
-    final currentPeriod = selectedPeriod.value;
-
-    if (currentPeriod == ReportPeriod.week &&
-        nextPeriod == ReportPeriod.month) {
-      // Preserve the source month when entering from a month. A directly
-      // selected week uses the month containing its Monday as the source.
-      return normalizeDate(nextPeriod, _anchor.sourceMonth ?? weekStart);
-    }
-
-    if (currentPeriod == ReportPeriod.week &&
-        nextPeriod == ReportPeriod.year) {
-      // A cross-year week belongs to the year containing its Monday.
-      return normalizeDate(nextPeriod, weekStart);
-    }
-
     return normalizeDate(nextPeriod, _anchor.date);
   }
 

-import 'package:doublefeel_flutter/app/modules/report_common/config/report_date_range_config.dart';
 import 'package:doublefeel_flutter/app/modules/report_common/controllers/report_period_logic.dart';
 import 'package:doublefeel_flutter/app/modules/report_common/models/report_period.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -10,26 +9,6 @@ class _TestReportPeriodLogic extends ReportPeriodLogic {
   Future<void> loadReport() async {}
 }
 
-class _MonthBoundaryReportPeriodLogic extends _TestReportPeriodLogic {
-  _MonthBoundaryReportPeriodLogic(this.sourceMonth);
-
-  final DateTime sourceMonth;
-
-  @override
-  DateTime normalizeDate(ReportPeriod period, DateTime date) {
-    if (period == ReportPeriod.week &&
-        date.year == sourceMonth.year &&
-        date.month == sourceMonth.month) {
-      // Simulates a month whose latest selectable week starts in the
-      // preceding month.
-      return sourceMonth.subtract(
-        Duration(days: sourceMonth.weekday - DateTime.monday),
-      );
-    }
-    return super.normalizeDate(period, date);
-  }
-}
-
 void main() {
   group('ReportPeriodLogic period transitions', () {
     test('year to month selects December for a completed year', () async {
@@ -113,7 +92,7 @@ void main() {
       );
     });
 
-    test('month to week to month keeps the source month',
+    test('month to week to month uses the week start month',
         () async {
       final logic = _TestReportPeriodLogic();
       final year = DateTime.now().year - 1;
@@ -126,52 +105,19 @@ void main() {
       expect(logic.monthStart, DateTime(year, DateTime.december));
     });
 
-    test('clamped cross-month week returns to the original source month',
-        () async {
-      final year = DateTime.now().year - 1;
-      final sourceMonth = List<DateTime>.generate(
-        12,
-        (index) => DateTime(year, index + 1),
-      ).firstWhere((month) => month.weekday != DateTime.monday);
-      final logic = _MonthBoundaryReportPeriodLogic(sourceMonth);
-      final clampedWeekStart = sourceMonth.subtract(
-        Duration(days: sourceMonth.weekday - DateTime.monday),
-      );
-      logic.initializeQuery(ReportPeriod.month, sourceMonth);
-
-      await logic.selectPeriod(ReportPeriod.week);
-      expect(logic.weekStart, clampedWeekStart);
-
-      await logic.selectPeriod(ReportPeriod.month);
-
-      expect(logic.monthStart, sourceMonth);
-    });
-
-    test('week to day selects Sunday when the whole week is selectable',
+    test('week to day selects Monday',
         () async {
       final logic = _TestReportPeriodLogic();
       logic.initializeQuery(
         ReportPeriod.week,
         DateTime(DateTime.now().year - 1, 10, 20),
       );
-      final expectedDay = logic.weekEnd;
+      final expectedDay = logic.weekStart;
 
       await logic.selectPeriod(ReportPeriod.day);
 
       expect(logic.selectedDate.value, expectedDay);
     });
 
-    test('week to day clamps a partial latest week to the latest date',
-        () async {
-      final logic = _TestReportPeriodLogic();
-      logic.initializeQuery(
-        ReportPeriod.week,
-        ReportDateRangeConfig.lastWeekStart(),
-      );
-
-      await logic.selectPeriod(ReportPeriod.day);
-
-      expect(logic.selectedDate.value, ReportDateRangeConfig.lastDate());
-    });
   });
 }