mohemm-flutter-app/lib/classes/utils.dart

import 'dart:convert';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:mohem_flutter_app/app_state/app_state.dart';
import 'package:mohem_flutter_app/config/routes.dart';

// import 'package:fluttertoast/fluttertoast.dart';
import 'package:mohem_flutter_app/exceptions/api_exception.dart';
import 'package:mohem_flutter_app/widgets/dialogs/confirm_dialog.dart';
import 'package:mohem_flutter_app/widgets/loading_dialog.dart';
import 'package:shared_preferences/shared_preferences.dart';

class Utils {
  static bool _isLoadingVisible = false;

  static bool get isLoading => _isLoadingVisible;

  static void showToast(String message, {bool longDuration = false}) {
    Fluttertoast.showToast(
        msg: message,
        toastLength: longDuration ? Toast.LENGTH_LONG : Toast.LENGTH_SHORT,
        gravity: ToastGravity.BOTTOM,
        timeInSecForIosWeb: 1,
        backgroundColor: Colors.black54,
        textColor: Colors.white,
        fontSize: 16.0);
  }

  static dynamic getNotNullValue(List<dynamic> list, int index) {
    try {
      return list[index];
    } catch (ex) {
      return null;
    }
  }

  static int stringToHex(String colorCode) {
    try {
      return int.parse(colorCode.replaceAll("#", "0xff"));
    } catch (ex) {
      return (0xff000000);
    }
  }

  static void showLoading(BuildContext context) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _isLoadingVisible = true;
      showDialog(
        context: context,
        barrierColor: Colors.black.withOpacity(0.5),
        builder: (BuildContext context) => LoadingDialog(),
      ).then((value) {
        _isLoadingVisible = false;
      });
    });
  }

  static Future delay(int millis) async {
    return await Future.delayed(Duration(milliseconds: millis));
  }

  static void hideLoading(BuildContext context) {
    if (_isLoadingVisible) {
      _isLoadingVisible = false;
      Navigator.of(context).pop();
    }
    _isLoadingVisible = false;
  }

  static Future<String> getStringFromPrefs(String key) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    return prefs.getString(key) ?? "";
  }

  static Future<bool> saveStringFromPrefs(String key, String value) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    return await prefs.setString(key, value);
  }

  static void handleException(dynamic exception, cxt, Function(String)? onErrorMessage) {
    String errorMessage;
    if (exception is APIException) {
      if (exception.message == APIException.UNAUTHORIZED) {
        return;
      } else {
        errorMessage = exception.error?.errorMessage ?? exception.message;
      }
    } else {
      errorMessage = APIException.UNKNOWN;
    }
    if (onErrorMessage != null) {
      onErrorMessage(errorMessage);
    } else {
      if (!AppState().isAuthenticated) {
        showDialog(
          context: cxt,
          builder: (cxt) => ConfirmDialog(
            message: errorMessage,
            onTap: () {
              Navigator.pushNamedAndRemoveUntil(cxt, AppRoutes.login, (Route<dynamic> route) => false);
            },
          ),
        );
      } else {
        showToast(errorMessage);
      }
    }
  }

  static void confirmDialog(cxt, String message) {
    showDialog(
      context: cxt,
      builder: (cxt) => ConfirmDialog(
        message: message,
      ),
    );
  }

  static getPostBytes(img) {
    try {
      var b64 = img.replaceFirst('data:image/png;base64,', '');
      if (img != null && Utils.isBase64(b64)) return Utils.dataFromBase64String(b64);
    } catch (e) {}
    return null;
  }

  static bool isBase64(String str) {
    RegExp _base64 = RegExp(r'^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=|[A-Za-z0-9+\/]{4})$');
    return _base64.hasMatch(str);
  }

  static Uint8List dataFromBase64String(String base64String) {
    return base64Decode(base64String);
  }
}