flutter_appfx/lib/utils/jsonUtils.dart

import 'dart:convert';



class JsonUtils {

  static String encodeJson(Object? value, {
    Object? Function(dynamic object)? toEncodable,
  }) {
    return json.encode(value, toEncodable: toEncodable);
  }

  static dynamic decodeJson(String source, {
    Object? Function(Object? key, Object? value)? reviver,
  }) {
    return json.decode(source, reviver: reviver);
  }


  static String getString(Map? map, String key, {String defaultValue = ''}) {
    if (map == null || !map.containsKey(key)) return defaultValue;
    final value = map[key];
    if (value == null) return defaultValue;
    return value.toString();
  }

  static String? tryGetString(Map? map, String key) {
    if (map == null || !map.containsKey(key)) return null;
    final value = map[key];
    if (value == null) return null;
    return value.toString();
  }


  static int getInt(Map? map, String key, {int defaultValue = 0}) {
    if (map == null || !map.containsKey(key)) return defaultValue;
    final value = map[key];
    if (value == null) return defaultValue;
    if (value is int) return value;
    return int.tryParse(value.toString()) ?? defaultValue;
  }

  static int? tryGetInt(Map? map, String key) {
    if (map == null || !map.containsKey(key)) return null;
    final value = map[key];
    if (value == null) return null;
    if (value is int) return value;
    return int.tryParse(value.toString());
  }


  static DateTime getDateTime(Map? map, String key) {
    DateTime defaultValue = DateTime.now();
    if (map == null || !map.containsKey(key)) return defaultValue;
    final value = map[key];
    if (value == null) return defaultValue;
    if (value is int) return DateTime.fromMillisecondsSinceEpoch(value);
    if (value is String) {
      final timestamp = int.tryParse(value);
      if (timestamp != null) {
        return DateTime.fromMillisecondsSinceEpoch(timestamp);
      }
    }
    final dateTime = DateTime.tryParse(value.toString());
    return dateTime ?? defaultValue;
  }

  static DateTime? tryGetDateTime(Map? map, String key) {
    DateTime? defaultValue;
    if (map == null || !map.containsKey(key)) return defaultValue;
    final value = map[key];
    if (value == null) return defaultValue;
    if (value is int) return DateTime.fromMillisecondsSinceEpoch(value);
    if (value is String) {
      final timestamp = int.tryParse(value);
      if (timestamp != null) {
        return DateTime.fromMillisecondsSinceEpoch(timestamp);
      }
    }
    final dateTime = DateTime.tryParse(value.toString());
    return dateTime ?? defaultValue;
  }

}