import 'dart:convert';

import 'package:comunic/models/login_tokens.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// Accounts credentials helper
///
/// Stores current account tokens
///
/// @author Pierre HUBERT

class AccountCredentialsHelper {

  /// Checkout whether current user is signed in or not
  Future<bool> signedIn() async {
    return await get() != null;
  }

  /// Set new login tokens
  Future<void> set(LoginTokens tokens) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setString("login_tokens", tokens.toString());
  }

  /// Get current [LoginTokens]. Returns null if none or in case of failure
  Future<LoginTokens> get() async {
    try {

      SharedPreferences prefs = await SharedPreferences.getInstance();
      final string = prefs.getString("login_tokens");
      if(string == null) return null;
      return LoginTokens.fromJSON(jsonDecode(string));

    } on Exception catch(e){
      print(e.toString());
      return null;
    }
  }
}