1 files changed, 80 insertions, 0 deletions
diff --git a/lib/services/settings_service.dart b/lib/services/settings_service.dart
new file mode 100644
index 0000000..027ecc2
--- /dev/null
+++ b/lib/services/settings_service.dart
@@ -0,0 +1,80 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+
+class Settings {
+  double salary;
+
+  Settings({required this.salary});
+
+  Settings.fromJson(Map<String, dynamic> json)
+      : salary = double.parse(json['salary']);
+
+  Map<String, dynamic> toJson() {
+    return {
+      'salary': salary.toStringAsFixed(2),
+    };
+  }
+}
+
+class DefaultSettings extends Settings {
+  DefaultSettings() : super(salary: 13.75);
+
+  DefaultSettings.fromJson(Map<String, dynamic> json) : super.fromJson(json);
+
+  Map<String, dynamic> toJson() {
+    return {
+      'salary': salary.toStringAsFixed(2),
+    };
+  }
+}
+
+class SettingsService {
+  Future<String> get _localPath async {
+    final directory = await getApplicationDocumentsDirectory();
+    return directory.path;
+  }
+
+  Future<File> get _localFile async {
+    final path = await _localPath;
+    File file = File('$path/settings.json');
+
+    bool exists = await file.exists();
+    if (!exists) {
+      print('created settings.json');
+      await file.create();
+      await writeSettingsToFile(DefaultSettings());
+    }
+
+    return File('$path/settings.json');
+  }
+
+  Future<void> writeSettingsToFile(Settings settings) async {
+    try {
+      final file = await _localFile;
+      String content = jsonEncode(settings);
+      print('writing to file: ' + content);
+      await file.writeAsString(content);
+    } catch (e, stacktrace) {
+      print(stacktrace);
+      print(e);
+    }
+  }
+
+  Future<Settings> readSettingsFromFile() async {
+    try {
+      final file = await _localFile;
+      final contents = await file.readAsString();
+      print('read from file: ' + contents);
+      var raw = await jsonDecode(contents);
+      var settings = Settings.fromJson(raw);
+      return settings;
+    } catch (e, stacktrace) {
+      print(stacktrace);
+      print(e);
+      writeSettingsToFile(DefaultSettings());
+      return DefaultSettings();
+    }
+  }
+}