Cw 262 better handle user exchange amount below minimum or maximum trade size (#868)

* CW-262-Better-handle-user-exchange-amount-below-minimum-or-maximum-trade-size

* fix: App should compute conversion even if it's not within the limits

lib/core/amount_validator.dart

@@ -3,17 +3,45 @@ import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cw_core/crypto_currency.dart';
 
 class AmountValidator extends TextValidator {
-  AmountValidator({required CryptoCurrency currency, bool isAutovalidate = false}) {
+  AmountValidator({
+    required CryptoCurrency currency,
+    bool isAutovalidate = false,
+    String? minValue,
+    String? maxValue,
+  }) {
     symbolsAmountValidator =
         SymbolsAmountValidator(isAutovalidate: isAutovalidate);
     decimalAmountValidator = DecimalAmountValidator(currency: currency,isAutovalidate: isAutovalidate);
+
+    amountMinValidator = AmountMinValidator(
+      minValue: minValue,
+      isAutovalidate: isAutovalidate,
+    );
+
+    amountMaxValidator = AmountMaxValidator(
+      maxValue: maxValue,
+      isAutovalidate: isAutovalidate,
+    );
   }
 
+  late final AmountMinValidator amountMinValidator;
+
+  late final AmountMaxValidator amountMaxValidator;
+
   late final SymbolsAmountValidator symbolsAmountValidator;
 
   late final DecimalAmountValidator decimalAmountValidator;
 
-  String? call(String? value) => symbolsAmountValidator(value) ?? decimalAmountValidator(value);
+  String? call(String? value) {
+    //* Validate for Text(length, symbols, decimals etc)
+
+    final textValidation = symbolsAmountValidator(value) ?? decimalAmountValidator(value);
+
+    //* Validate for Comparison(Value greater than min and less than )
+    final comparisonValidation = amountMinValidator(value) ?? amountMaxValidator(value);
+
+    return textValidation ?? comparisonValidation;
+  }
 }
 
 class SymbolsAmountValidator extends TextValidator {
@@ -57,3 +85,71 @@ class AllAmountValidator extends TextValidator {
             minLength: 0,
             maxLength: 0);
 }
+
+class AmountMinValidator extends Validator<String> {
+  final String? minValue;
+  final bool isAutovalidate;
+
+  AmountMinValidator({
+    this.minValue,
+    required this.isAutovalidate,
+  }) : super(errorMessage: S.current.error_text_input_below_minimum_limit);
+
+  @override
+  bool isValid(String? value) {
+    if (value == null || value.isEmpty) {
+      return isAutovalidate ? true : false;
+    }
+
+    if (minValue == null || minValue == "null") {
+      return true;
+    }
+
+    final valueInDouble = parseToDouble(value);
+    final minInDouble = parseToDouble(minValue ?? '');
+
+    if (valueInDouble == null || minInDouble == null) {
+      return false;
+    }
+
+    return valueInDouble > minInDouble;
+  }
+
+  double? parseToDouble(String value) {
+    final data = double.tryParse(value.replaceAll(',', '.'));
+    return data;
+  }
+}
+
+class AmountMaxValidator extends Validator<String> {
+  final String? maxValue;
+  final bool isAutovalidate;
+
+  AmountMaxValidator({
+    this.maxValue,
+    required this.isAutovalidate,
+  }) : super(errorMessage: S.current.error_text_input_above_maximum_limit);
+
+  @override
+  bool isValid(String? value) {
+    if (value == null || value.isEmpty) {
+      return isAutovalidate ? true : false;
+    }
+
+    if (maxValue == null || maxValue == "null") {
+      return true;
+    }
+
+    final valueInDouble = parseToDouble(value);
+    final maxInDouble = parseToDouble(maxValue ?? '');
+
+    if (valueInDouble == null || maxInDouble == null) {
+      return false;
+    }
+    return valueInDouble < maxInDouble;
+  }
+
+  double? parseToDouble(String value) {
+    return double.tryParse(value.replaceAll(',', '.'));
+  }
+}

lib/src/screens/exchange/exchange_page.dart

@@ -456,8 +456,7 @@ class ExchangePage extends BasePage {
     depositAmountController.addListener(() {
       if (depositAmountController.text != exchangeViewModel.depositAmount) {
         _depositAmountDebounce.run(() { 
-          exchangeViewModel.changeDepositAmount(
-              amount: depositAmountController.text);
+          exchangeViewModel.changeDepositAmount(amount: depositAmountController.text);
           exchangeViewModel.isReceiveAmountEntered = false;
         });
       }
@@ -469,8 +468,7 @@ class ExchangePage extends BasePage {
     receiveAmountController.addListener(() {
       if (receiveAmountController.text != exchangeViewModel.receiveAmount) {
         _receiveAmountDebounce.run(() {
-          exchangeViewModel.changeReceiveAmount(
-              amount: receiveAmountController.text);
+          exchangeViewModel.changeReceiveAmount(amount: receiveAmountController.text);
           exchangeViewModel.isReceiveAmountEntered = true;
         });
       }
@@ -626,8 +624,16 @@ class ExchangePage extends BasePage {
       currencyButtonColor: Colors.transparent,
       addressButtonsColor: Theme.of(context).focusColor!,
       borderColor: Theme.of(context).primaryTextTheme!.bodyText1!.color!,
-      currencyValueValidator:
-      AmountValidator(currency: exchangeViewModel.depositCurrency),
+      currencyValueValidator: (value) {
+        return !exchangeViewModel.isFixedRateMode
+            ? AmountValidator(
+                isAutovalidate: true,
+                currency: exchangeViewModel.depositCurrency,
+                minValue: exchangeViewModel.limits.min.toString(),
+                maxValue: exchangeViewModel.limits.max.toString(),
+              ).call(value)
+            : null;
+      },
       addressTextFieldValidator:
       AddressValidator(type: exchangeViewModel.depositCurrency),
       onPushPasteButton: (context) async {
@@ -668,8 +674,16 @@ class ExchangePage extends BasePage {
       addressButtonsColor: Theme.of(context).focusColor!,
       borderColor:
       Theme.of(context).primaryTextTheme!.bodyText1!.decorationColor!,
-      currencyValueValidator:
-      AmountValidator(currency: exchangeViewModel.receiveCurrency),
+      currencyValueValidator: (value) {
+        return exchangeViewModel.isFixedRateMode
+            ? AmountValidator(
+                isAutovalidate: true,
+                currency: exchangeViewModel.receiveCurrency,
+                minValue: exchangeViewModel.limits.min.toString(),
+                maxValue: exchangeViewModel.limits.max.toString(),
+              ).call(value)
+            : null;
+      },
       addressTextFieldValidator:
       AddressValidator(type: exchangeViewModel.receiveCurrency),
       onPushPasteButton: (context) async {

lib/view_model/exchange/exchange_view_model.dart

@@ -198,6 +198,9 @@ abstract class ExchangeViewModelBase with Store {
   @observable
   bool isFixedRateMode;
 
+  @observable
+  Limits limits;
+
   @computed
   SyncStatus get status => wallet.syncStatus;
 
@@ -241,8 +244,6 @@ abstract class ExchangeViewModelBase with Store {
 
   List<CryptoCurrency> depositCurrencies;
 
-  Limits limits;
-
   NumberFormat _cryptoNumberFormat;
 
   final SettingsStore _settingsStore;
@@ -320,6 +321,22 @@ abstract class ExchangeViewModelBase with Store {
         .replaceAll(RegExp('\\,'), '');
   }
 
+  bool checkIfInputMeetsMinOrMaxCondition(String input) {
+    final _enteredAmount = double.tryParse(input.replaceAll(',', '.')) ?? 0;
+    double minLimit = limits.min ?? 0;
+    double? maxLimit = limits.max;
+
+    if (_enteredAmount < minLimit) {
+      return false;
+    }
+
+    if (maxLimit != null && _enteredAmount > maxLimit) {
+      return false;
+    }
+
+    return true;
+  }
+
   Future<void> _calculateBestRate() async {
     final amount = double.tryParse(isFixedRateMode ? receiveAmount : depositAmount) ?? 1;
 

res/values/strings_ar.arb

@@ -697,5 +697,7 @@
    "onion_link": "رابط البصل",
    "settings": "إعدادات",
    "sell_monero_com_alert_content": "بيع Monero غير مدعوم حتى الآن",
+   "error_text_input_below_minimum_limit":" المبلغ أقل من الحد الأدنى",
+   "error_text_input_above_maximum_limit":"المبلغ أكبر من الحد الأقصى",
    "show_market_place": "إظهار السوق"
 }

res/values/strings_bg.arb

@@ -698,5 +698,7 @@
   "clearnet_link": "Clearnet връзка",
   "onion_link": "Лукова връзка",
   "sell_monero_com_alert_content": "Продажбата на Monero все още не се поддържа",
+  "error_text_input_below_minimum_limit" : "Сумата е по-малко от минималната",
+  "error_text_input_above_maximum_limit" : "Сумата надвишава максималната",
   "show_market_place":"Покажи пазар"
 }

res/values/strings_cs.arb

@@ -698,5 +698,7 @@
   "clearnet_link": "Odkaz na Clearnet",
   "onion_link": "Cibulový odkaz",
   "sell_monero_com_alert_content": "Prodej Monero zatím není podporován",
+  "error_text_input_below_minimum_limit" : "Částka je menší než minimální hodnota",
+  "error_text_input_above_maximum_limit" : "Částka je větší než maximální hodnota",
   "show_market_place": "Zobrazit trh"
 }

res/values/strings_de.arb

@@ -699,5 +699,7 @@
   "onion_link": "Zwiebel-Link",
   "settings": "Einstellungen",
   "sell_monero_com_alert_content": "Der Verkauf von Monero wird noch nicht unterstützt",
+  "error_text_input_below_minimum_limit" : "Menge ist unter dem Minimum",
+  "error_text_input_above_maximum_limit" : "Menge ist über dem Maximum",
   "show_market_place": "Marktplatz anzeigen"
 }

res/values/strings_en.arb

@@ -699,5 +699,7 @@
   "edit_node": "Edit Node",
   "settings": "Settings",
   "sell_monero_com_alert_content": "Selling Monero is not supported yet",
+  "error_text_input_below_minimum_limit" : "Amount is less than the minimum",
+  "error_text_input_above_maximum_limit" : "Amount is more than the maximum",
   "show_market_place" :"Show Marketplace"
 }

res/values/strings_es.arb

@@ -699,5 +699,7 @@
   "onion_link": "Enlace de cebolla",
   "settings": "Configuraciones",
   "sell_monero_com_alert_content": "Aún no se admite la venta de Monero",
+  "error_text_input_below_minimum_limit" : "La cantidad es menos que mínima",
+  "error_text_input_above_maximum_limit" : "La cantidad es más que el máximo",
   "show_market_place": "Mostrar mercado"
 }

res/values/strings_fr.arb

@@ -699,5 +699,7 @@
   "settings": "Paramètres",
   "onion_link": "Lien .onion",
   "sell_monero_com_alert_content": "La vente de Monero n'est pas encore prise en charge",
+  "error_text_input_below_minimum_limit" : "Le montant est inférieur au minimum",
+  "error_text_input_above_maximum_limit" : "Le montant est supérieur au maximum",
   "show_market_place" :"Afficher la place de marché"
 }

res/values/strings_hi.arb

@@ -699,5 +699,7 @@
   "onion_link": "प्याज का लिंक",
   "settings": "समायोजन",
   "sell_monero_com_alert_content": "मोनेरो बेचना अभी तक समर्थित नहीं है",
+  "error_text_input_below_minimum_limit" : "राशि न्यूनतम से कम है",
+  "error_text_input_above_maximum_limit" : "राशि अधिकतम से अधिक है",
   "show_market_place":"बाज़ार दिखाएँ"
 }

res/values/strings_hr.arb

@@ -699,5 +699,7 @@
   "onion_link": "Poveznica luka",
   "settings": "Postavke",
   "sell_monero_com_alert_content": "Prodaja Monera još nije podržana",
+  "error_text_input_below_minimum_limit" : "Iznos je manji od minimalnog",
+  "error_text_input_above_maximum_limit" : "Iznos je veći od maskimalnog",
   "show_market_place" : "Prikaži tržište"
 }

res/values/strings_id.arb

@@ -680,5 +680,7 @@
   "clearnet_link": "Tautan clearnet",
   "onion_link": "Tautan bawang",
   "sell_monero_com_alert_content": "Menjual Monero belum didukung",
+  "error_text_input_below_minimum_limit" : "Jumlah kurang dari minimal",
+  "error_text_input_above_maximum_limit" : "Jumlah lebih dari maksimal",
   "show_market_place": "Tampilkan Pasar"
 }

res/values/strings_it.arb

@@ -699,5 +699,7 @@
   "onion_link": "Collegamento a cipolla",
   "settings": "Impostazioni",
   "sell_monero_com_alert_content": "La vendita di Monero non è ancora supportata",
+  "error_text_input_below_minimum_limit" : "L'ammontare è inferiore al minimo",
+  "error_text_input_above_maximum_limit" : "L'ammontare è superiore al massimo",
   "show_market_place":"Mostra mercato"
 }

res/values/strings_ja.arb

@@ -699,5 +699,7 @@
   "onion_link": "オニオンリンク",
   "settings": "設定",
   "sell_monero_com_alert_content": "モネロの販売はまだサポートされていません",
+  "error_text_input_below_minimum_limit" : "金額は最小額より少ない",
+  "error_text_input_above_maximum_limit" : "金額は最大値を超えています",
   "show_market_place":"マーケットプレイスを表示"
 }

res/values/strings_ko.arb

@@ -699,5 +699,7 @@
   "onion_link": "양파 링크",
   "settings": "설정",
   "sell_monero_com_alert_content": "지원되지 않습니다.",
+  "error_text_input_below_minimum_limit" : "금액이 최소보다 적습니다.",
+  "error_text_input_above_maximum_limit" : "금액이 최대 값보다 많습니다.",
   "show_market_place":"마켓플레이스 표시"
 }

res/values/strings_my.arb

@@ -699,5 +699,7 @@
   "onion_link": "ကြက်သွန်လင့်",
   "settings": "ဆက်တင်များ",
   "sell_monero_com_alert_content": "Monero ရောင်းချခြင်းကို မပံ့ပိုးရသေးပါ။",
+  "error_text_input_below_minimum_limit" : "ပမာဏသည် အနိမ့်ဆုံးထက်နည်းသည်။",
+  "error_text_input_above_maximum_limit" : "ပမာဏသည် အများဆုံးထက် ပိုများသည်။",
   "show_market_place":"စျေးကွက်ကိုပြသပါ။"
 }

res/values/strings_nl.arb

@@ -699,5 +699,7 @@
   "onion_link": "Ui koppeling",
   "settings": "Instellingen",
   "sell_monero_com_alert_content": "Het verkopen van Monero wordt nog niet ondersteund",
+  "error_text_input_below_minimum_limit" : "Bedrag is minder dan minimaal",
+  "error_text_input_above_maximum_limit" : "Bedrag is meer dan maximaal",
   "show_market_place":"Toon Marktplaats"
 }

res/values/strings_pl.arb

@@ -699,5 +699,7 @@
   "onion_link": "Łącznik cebulowy",
   "settings": "Ustawienia",
   "sell_monero_com_alert_content": "Sprzedaż Monero nie jest jeszcze obsługiwana",
+  "error_text_input_below_minimum_limit" : "Kwota jest mniejsza niż minimalna",
+  "error_text_input_above_maximum_limit" : "Kwota jest większa niż maksymalna",
   "show_market_place" : "Pokaż rynek"
 }

res/values/strings_pt.arb

@@ -698,5 +698,7 @@
   "onion_link": "ligação de cebola",
   "settings": "Configurações",
   "sell_monero_com_alert_content": "A venda de Monero ainda não é suportada",
+  "error_text_input_below_minimum_limit" : "O valor é menor que o mínimo",
+  "error_text_input_above_maximum_limit" : "O valor é superior ao máximo",
   "show_market_place":"Mostrar mercado"
 }

res/values/strings_ru.arb

@@ -699,5 +699,7 @@
   "onion_link": "Луковая ссылка",
   "settings": "Настройки",
   "sell_monero_com_alert_content": "Продажа Monero пока не поддерживается",
+  "error_text_input_below_minimum_limit" : "Сумма меньше минимальной",
+  "error_text_input_above_maximum_limit" : "Сумма больше максимальной",
   "show_market_place":"Показать торговую площадку"
 }

res/values/strings_th.arb

@@ -697,5 +697,7 @@
   "onion_link": "ลิงค์หัวหอม",
   "settings": "การตั้งค่า",
   "sell_monero_com_alert_content": "ยังไม่รองรับการขาย Monero",
+  "error_text_input_below_minimum_limit" : "จำนวนเงินน้อยกว่าขั้นต่ำ",
+  "error_text_input_above_maximum_limit" : "จำนวนเงินสูงกว่าค่าสูงสุด",
   "show_market_place":"แสดงตลาดกลาง"
 }

res/values/strings_tr.arb

@@ -699,5 +699,7 @@
   "onion_link": "soğan bağlantısı",
   "settings": "ayarlar",
   "sell_monero_com_alert_content": "Monero satışı henüz desteklenmiyor",
+  "error_text_input_below_minimum_limit" : "Miktar minimumdan daha azdır",
+  "error_text_input_above_maximum_limit" : "Miktar maksimumdan daha fazla",
   "show_market_place":"Pazar Yerini Göster"
 }

res/values/strings_uk.arb

@@ -698,5 +698,7 @@
   "onion_link": "Посилання на цибулю",
   "settings": "Налаштування",
   "sell_monero_com_alert_content": "Продаж Monero ще не підтримується",
+  "error_text_input_below_minimum_limit" : "Сума менша мінімальної",
+  "error_text_input_above_maximum_limit" : "Сума більше максимальної",
   "show_market_place":"Шоу Ринок"
 }

res/values/strings_ur.arb

@@ -699,5 +699,7 @@
   "clearnet_link": "کلیرنیٹ لنک",
   "onion_link": "پیاز کا لنک",
   "sell_monero_com_alert_content": "Monero فروخت کرنا ابھی تک تعاون یافتہ نہیں ہے۔",
+  "error_text_input_below_minimum_limit" : "رقم کم از کم سے کم ہے۔",
+  "error_text_input_above_maximum_limit" : "رقم زیادہ سے زیادہ سے زیادہ ہے۔",
   "show_market_place":"بازار دکھائیں۔"
 }

res/values/strings_zh.arb

@@ -698,5 +698,7 @@
   "onion_link": "洋葱链接",
   "settings": "设置",
   "sell_monero_com_alert_content": "尚不支持出售门罗币",
+  "error_text_input_below_minimum_limit" : "金额小于最小值",
+  "error_text_input_above_maximum_limit" : "金额大于最大值",
   "show_market_place" :"显示市场"
 }