Fix lunar date validation and add test coverage

.metadata

@@ -0,0 +1,30 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "ff37bef603469fb030f2b72995ab929ccfc227f0"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: ff37bef603469fb030f2b72995ab929ccfc227f0
+      base_revision: ff37bef603469fb030f2b72995ab929ccfc227f0
+    - platform: web
+      create_revision: ff37bef603469fb030f2b72995ab929ccfc227f0
+      base_revision: ff37bef603469fb030f2b72995ab929ccfc227f0
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

lib/main_view.dart

@@ -262,11 +262,18 @@ class _MainState extends State<MainView> {
   }
 
   String? _validateNgayThangNam(String? value) {
-    if (value!.isEmpty) return 'Cần nhập ngày âm';
-    final nameExp = RegExp(
-      r'^(?:31([/\-.])(?:0?[13578]|1[02])\1|(?:29|30)(/)(?:0?[13-9]|1[0-2])\2)(?:1[6-9]|[2-9]\d)?\d{2}$|^29([/\-.])0?2\3(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:16|[2468][048]|[3579][26])00)$|^(?:0?[1-9]|1\d|2[0-8])([/\-.])(?:0?[1-9]|1[0-2])\4(?:1[6-9]|[2-9]\d)?\d{2}$',
-    );
-    if (!nameExp.hasMatch(value)) return 'Nhập theo Ngày/Tháng/Năm';
+    if (value == null || value.isEmpty) return 'Cần nhập ngày âm';
+    final parts = value.split('/');
+    if (parts.length != 3) return 'Nhập theo Ngày/Tháng/Năm';
+    final day = int.tryParse(parts[0]);
+    final month = int.tryParse(parts[1]);
+    final year = int.tryParse(parts[2]);
+    if (day == null || month == null || year == null) {
+      return 'Nhập theo Ngày/Tháng/Năm';
+    }
+    if (day < 1 || day > 30) return 'Ngày từ 1 đến 30';
+    if (month < 1 || month > 12) return 'Tháng từ 1 đến 12';
+    if (year < 1) return 'Năm không hợp lệ';
     return null;
   }
 

test/main_bloc_test.dart

@@ -1,5 +1,6 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:licham/main_bloc.dart';
+import 'package:licham/main_event.dart';
 import 'package:licham/main_state.dart';
 
 void main() {
@@ -25,4 +26,138 @@ void main() {
     await mainBloc.close();
     await future;
   });
+
+  group('solar to lunar conversion', () {
+    Future<DateUpdate> convertDate(DateTime solar) async {
+      final bloc = MainBloc(solar)..add(const AppStarted());
+      final state = await bloc.stream.firstWhere((s) => s is DateUpdate);
+      await bloc.close();
+      return state as DateUpdate;
+    }
+
+    group('Tết Nguyên Đán (Lunar New Year = 1/1)', () {
+      test('2024-02-10 is Mùng 1 Tết Giáp Thìn', () async {
+        final state = await convertDate(DateTime(2024, 2, 10));
+        expect(state.lunar!.day, 1);
+        expect(state.lunar!.month, 1);
+        expect(state.lunar!.year, 2024);
+        expect(state.lunar!.canchiYear, 'Giáp Thìn');
+      });
+
+      test('2025-01-29 is Mùng 1 Tết Ất Tỵ', () async {
+        final state = await convertDate(DateTime(2025, 1, 29));
+        expect(state.lunar!.day, 1);
+        expect(state.lunar!.month, 1);
+        expect(state.lunar!.year, 2025);
+        expect(state.lunar!.canchiYear, 'Ất Tỵ');
+      });
+
+      test('2026-02-17 is Mùng 1 Tết Bính Ngọ', () async {
+        final state = await convertDate(DateTime(2026, 2, 17));
+        expect(state.lunar!.day, 1);
+        expect(state.lunar!.month, 1);
+        expect(state.lunar!.year, 2026);
+        expect(state.lunar!.canchiYear, 'Bính Ngọ');
+      });
+
+      test('2023-01-22 is Mùng 1 Tết Quý Mão', () async {
+        final state = await convertDate(DateTime(2023, 1, 22));
+        expect(state.lunar!.day, 1);
+        expect(state.lunar!.month, 1);
+        expect(state.lunar!.year, 2023);
+        expect(state.lunar!.canchiYear, 'Quý Mão');
+      });
+    });
+
+    group('Rằm Trung Thu (Mid-Autumn = 15/8)', () {
+      test('2024-09-17 is Rằm tháng Tám', () async {
+        final state = await convertDate(DateTime(2024, 9, 17));
+        expect(state.lunar!.day, 15);
+        expect(state.lunar!.month, 8);
+      });
+
+      test('2025-10-06 is Rằm tháng Tám', () async {
+        final state = await convertDate(DateTime(2025, 10, 6));
+        expect(state.lunar!.day, 15);
+        expect(state.lunar!.month, 8);
+      });
+    });
+
+    test('emits auspicious hours', () async {
+      final state = await convertDate(DateTime(2024, 2, 10));
+      expect(state.lunar!.hours, isNotNull);
+      expect(state.lunar!.hours, isNotEmpty);
+    });
+
+    test('emits Can Chi for day and month', () async {
+      final state = await convertDate(DateTime(2024, 2, 10));
+      expect(state.lunar!.canChiDay, isNotNull);
+      expect(state.lunar!.canChiMonth, isNotNull);
+    });
+  });
+
+  group('date navigation', () {
+    test('next day advances solar date', () async {
+      final bloc = MainBloc(DateTime(2024, 2, 10))..add(const AppStarted());
+
+      final states = <DateUpdate>[];
+      final sub = bloc.stream
+          .where((s) => s is DateUpdate)
+          .cast<DateUpdate>()
+          .listen(states.add);
+
+      await Future<void>.delayed(const Duration(milliseconds: 100));
+      bloc.add(const NextSelected());
+      await Future<void>.delayed(const Duration(milliseconds: 100));
+
+      expect(states.length, greaterThanOrEqualTo(2));
+      expect(states.last.solar!.day, 11);
+      expect(states.last.solar!.month, 2);
+
+      await sub.cancel();
+      await bloc.close();
+    });
+
+    test('previous day goes back', () async {
+      final bloc = MainBloc(DateTime(2024, 2, 10))..add(const AppStarted());
+
+      final states = <DateUpdate>[];
+      final sub = bloc.stream
+          .where((s) => s is DateUpdate)
+          .cast<DateUpdate>()
+          .listen(states.add);
+
+      await Future<void>.delayed(const Duration(milliseconds: 100));
+      bloc.add(const PreviousSelected());
+      await Future<void>.delayed(const Duration(milliseconds: 100));
+
+      expect(states.length, greaterThanOrEqualTo(2));
+      expect(states.last.solar!.day, 9);
+      expect(states.last.solar!.month, 2);
+
+      await sub.cancel();
+      await bloc.close();
+    });
+
+    test('solar date selection updates lunar', () async {
+      final bloc = MainBloc(DateTime(2024))..add(const AppStarted());
+
+      final states = <DateUpdate>[];
+      final sub = bloc.stream
+          .where((s) => s is DateUpdate)
+          .cast<DateUpdate>()
+          .listen(states.add);
+
+      await Future<void>.delayed(const Duration(milliseconds: 100));
+      bloc.add(SolarSelected(solar: DateTime(2024, 2, 10)));
+      await Future<void>.delayed(const Duration(milliseconds: 100));
+
+      expect(states.last.lunar!.day, 1);
+      expect(states.last.lunar!.month, 1);
+      expect(states.last.lunar!.year, 2024);
+
+      await sub.cancel();
+      await bloc.close();
+    });
+  });
 }