search: add api for fetching datasource versions

lib/search.dart

@@ -4,6 +4,7 @@ import 'package:jadb/models/word_search/word_search_result.dart';
 import 'package:jadb/search/filter_kanji.dart';
 import 'package:jadb/search/kanji_search.dart';
 import 'package:jadb/search/radical_search.dart';
+import 'package:jadb/search/versions.dart';
 import 'package:jadb/search/word_search/word_search.dart';
 import 'package:sqflite_common/sqlite_api.dart';
 
@@ -18,8 +19,9 @@ extension JaDBConnection on DatabaseExecutor {
       searchKanjiWithDbConnection(this, kanji);
 
   /// Search for a kanji in the database.
-  Future<Map<String, KanjiSearchResult>> jadbGetManyKanji(Iterable<String> kanji) =>
-      searchManyKanjiWithDbConnection(this, kanji);
+  Future<Map<String, KanjiSearchResult>> jadbGetManyKanji(
+    Iterable<String> kanji,
+  ) => searchManyKanjiWithDbConnection(this, kanji);
 
   /// Filter a list of characters, and return the ones that are listed in the kanji dictionary.
   Future<List<String>> filterKanji(
@@ -68,4 +70,8 @@ extension JaDBConnection on DatabaseExecutor {
   /// of the radicals, and return those.
   Future<List<String>> jadbSearchKanjiByRadicals(List<String> radicals) =>
       searchKanjiByRadicalsWithDbConnection(this, radicals);
+
+  /// Retrieve the version information for all datasources in the database.
+  Future<DatasourceVersions> jadbGetDatasourceVersions() =>
+      getDatasourceVersions(this);
 }

lib/search/versions.dart

@@ -0,0 +1,84 @@
+import 'package:jadb/table_names/jmdict.dart';
+import 'package:jadb/table_names/kanjidic.dart';
+import 'package:jadb/table_names/radkfile.dart';
+import 'package:jadb/table_names/tanos_jlpt.dart';
+import 'package:sqflite_common/sqlite_api.dart';
+
+class DatasourceVersions {
+  final String jmdictVersion;
+  final DateTime jmdictDate;
+  final String jmdictHash;
+
+  final String kanjidic2Version;
+  final DateTime kanjidic2Date;
+  final String kanjidic2Hash;
+
+  final String radkfileVersion;
+  final DateTime radkfileDate;
+  final String radkfileHash;
+
+  final String tanosJlptVersion;
+  final DateTime tanosJlptDate;
+  final String tanosJlptHash;
+
+  const DatasourceVersions({
+    required this.jmdictVersion,
+    required this.jmdictDate,
+    required this.jmdictHash,
+    required this.kanjidic2Version,
+    required this.kanjidic2Date,
+    required this.kanjidic2Hash,
+    required this.radkfileVersion,
+    required this.radkfileDate,
+    required this.radkfileHash,
+    required this.tanosJlptVersion,
+    required this.tanosJlptDate,
+    required this.tanosJlptHash,
+  });
+}
+
+DateTime _parseDateTime(String dateString) {
+  try {
+    return DateTime.parse(dateString);
+  } catch (e) {
+    if (RegExp(r'^\d{4}-\d{2}$').hasMatch(dateString)) {
+      return DateTime.parse('$dateString-01');
+    } else if (RegExp(r'^\d{4}$').hasMatch(dateString)) {
+      return DateTime.parse('$dateString-01-01');
+    } else {
+      throw FormatException('Invalid date format: $dateString');
+    }
+  }
+}
+
+Future<DatasourceVersions> getDatasourceVersions(
+  final DatabaseExecutor connection,
+) async {
+  final jmdictVersion = await connection
+      .query(JMdictTableNames.version)
+      .then((rows) => rows.first);
+  final kanjidic2Version = await connection
+      .query(KANJIDICTableNames.version)
+      .then((rows) => rows.first);
+  final radkfileVersion = await connection
+      .query(RADKFILETableNames.version)
+      .then((rows) => rows.first);
+  final tanosJlptVersion = await connection
+      .query(TanosJLPTTableNames.version)
+      .then((rows) => rows.first);
+
+  return DatasourceVersions(
+    jmdictVersion: jmdictVersion['version'] as String,
+    jmdictDate: _parseDateTime(jmdictVersion['date'].toString()),
+    jmdictHash: jmdictVersion['hash'] as String,
+    kanjidic2Version: kanjidic2Version['version'] as String,
+    kanjidic2Date: _parseDateTime(kanjidic2Version['date'].toString()),
+    kanjidic2Hash: kanjidic2Version['hash'] as String,
+    radkfileVersion: radkfileVersion['version'] as String,
+    radkfileDate: _parseDateTime(radkfileVersion['date'].toString()),
+    radkfileHash: radkfileVersion['hash'] as String,
+    tanosJlptVersion: tanosJlptVersion['version'] as String,
+    tanosJlptDate: _parseDateTime(tanosJlptVersion['date'].toString()),
+    tanosJlptHash: tanosJlptVersion['hash'] as String,
+  );
+}

test/search/datasource_versions_test.dart

@@ -0,0 +1,12 @@
+import 'package:jadb/search.dart';
+import 'package:test/test.dart';
+
+import 'setup_database_connection.dart';
+
+void main() {
+  test('Retrieve datasource versions', () async {
+    final connection = await setupDatabaseConnection();
+    final result = await connection.jadbGetDatasourceVersions();
+    expect(result, isNotNull);
+  });
+}