Project lint checked and step added to config.yml

lib/main_view_model.dart

@@ -0,0 +1,61 @@
+import 'package:easy_cc_flutter/base_viewmodel.dart';
+import 'package:easy_cc_flutter/Utils/selection_type.dart';
+
+import 'Utils/constants.dart';
+import 'data/prefs/currency_pair.dart';
+import 'data/repository/repository.dart';
+import 'data/repository/repository_impl.dart';
+import 'locator.dart';
+
+class MainViewModel extends BaseViewmodel {
+  final Repository _repository = locator<RepositoryImpl>();
+
+  double conversionRate = 1.0;
+
+  String getConversionPair(SelectionType type) {
+    CurrencyPair pair = _repository.getConversionPair();
+
+    switch (type) {
+      case SelectionType.conversionFrom:
+        return pair.currencyOne != null
+            ? pair.currencyOne!
+            : listOfCurrencies[0];
+      case SelectionType.conversionTo:
+        return pair.currencyTwo != null
+            ? pair.currencyTwo!
+            : listOfCurrencies[0];
+      default:
+        throw NullThrownError();
+    }
+  }
+
+  void setConversionPair(String fromCurrency, String toCurrency) {
+    _repository.setConversionPair(fromCurrency, toCurrency);
+    setCurrencyRate(fromCurrency, toCurrency);
+  }
+
+  void setCurrencyRate(String fromCurrency, String toCurrency) {
+    onStart();
+    _repository.getConversationRateFromApi(fromCurrency, toCurrency).then(
+        (value) {
+          conversionRate = value.rate != null ? value.rate! : 0.00;
+          onSuccess(value);
+    }, onError: (exception, _) {
+          onError(exception.message);
+    });
+  }
+
+  String convertInput(String? input, SelectionType type) {
+    if (input == null || input.isEmpty) {
+      return "";
+    }
+    double convertedInput = double.parse(input);
+
+    switch (type) {
+      case SelectionType.conversionFrom:
+        return (convertedInput * conversionRate).toStringAsFixed(2);
+      case SelectionType.conversionTo:
+        return (convertedInput / conversionRate).toStringAsFixed(2);
+    }
+  }
+}