import 'package:shared_preferences/shared_preferences.dart';

enum StorageServiceValueType {
  string,
  stringList,
  boolean,
}

class StorageService {

  StorageService._();

  static late SharedPreferences _preferences;

  static Future<void> init() async {
    _preferences = await SharedPreferences.getInstance();
  }

  static T? getValue<T>( StorageServiceValueType valueType, String key ){

    Map<StorageServiceValueType, Function( String key ) > data = {
      StorageServiceValueType.string: _preferences.getString,
      StorageServiceValueType.stringList: _preferences.getStringList,
      StorageServiceValueType.boolean: _preferences.getBool,
    };

    final Function( String key )? function = data[valueType];

    if( function == null ) throw Exception('Unimplemented value type');

    return function(key) as T?;

  }

  static Future<bool> setValue( StorageServiceValueType valueType, String key, dynamic value ) async {

    switch( valueType ) {
      case .string:
        return _preferences.setString(key, value);
      case.stringList:
        return _preferences.setStringList(key, value);
      case .boolean:
        return _preferences.setBool(key, value);
    }

    throw Exception('Unimplemented value type');

  }

  static Future<bool> removeValue( String key ) async {
    return await _preferences.remove(key);
  }

}