Merge branch 'development_sikander' into 'master'

api structure improvement.

See merge request mirza.shafique/mohem_flutter_app!11

lib/api/api_client.dart

@@ -10,8 +10,8 @@ import 'package:mohem_flutter_app/exceptions/api_exception.dart';
 typedef FactoryConstructor<U> = U Function(dynamic);
 
 class APIError {
-  int errorCode;
-  String errorMessage;
+  int? errorCode;
+  String? errorMessage;
 
   APIError(this.errorCode, this.errorMessage);
 
@@ -74,18 +74,22 @@ class ApiClient {
       print("body:$jsonObject");
     }
     var response = await postJsonForResponse(url, jsonObject, token: token, queryParameters: queryParameters, headers: _headers, retryTimes: retryTimes);
-   // try {
+    try {
       var jsonData = jsonDecode(response.body);
-      if (jsonData["ErrorMessage"] != null) {
+      if (jsonData["ErrorMessage"] == null) {
         return factoryConstructor(jsonData);
       } else {
-        throw _throwAPIException(response);
+        APIError? apiError;
+        apiError = APIError(jsonData['ErrorCode'], jsonData['ErrorMessage']);
+        throw APIException(APIException.BAD_REQUEST, error: apiError);
       }
-    // } catch (ex) {
-    //   print(response.body);
-    //   print(ex);
-    //   throw APIException(APIException.BAD_RESPONSE_FORMAT, arguments: ex);
-    // }
+    } catch (ex) {
+      if (ex is APIException) {
+        rethrow;
+      } else {
+        throw APIException(APIException.BAD_RESPONSE_FORMAT, arguments: ex);
+      }
+    }
   }
 
   Future<Response> postJsonForResponse<T>(String url, T jsonObject, {String? token, Map<String, dynamic>? queryParameters, Map<String, String>? headers, int retryTimes = 0}) async {