Custodian withdrawal support + Some refactoring and cleanup (#4085)

* Renamed "WithdrawAsync" to "WithdrawToStoreWalletAsync"

* WIP

* WIP withdrawal + Refactored Form saving to JObject

* WIP

* Form to fix bad values during withdrawing appears correctly

* WIP

* Lots of cleanup and refactoring + Password field and toggle password view

* Cleanup + Finishing touches on withdrawals

* Added "Destination" dummy text as this is always the destination.

* Fixed broken test

* Added support for withdrawing using qty as a percentage if it ends with "%". Needs more testing.

* Fixed broken build

* Fixed broken build (2)

* Update BTCPayServer/wwwroot/swagger/v1/swagger.template.custodians.json

Co-authored-by: d11n <mail@dennisreimann.de>

* Update BTCPayServer/wwwroot/swagger/v1/swagger.template.custodians.json

Co-authored-by: d11n <mail@dennisreimann.de>

* Improved unit tests

* Fixed swagger bug

* Test improvements

Make string conversion of quantity explicitely.

* Fix build warnings

* Swagger: Add missing operationId

* Made change Dennis requested

* Removed unused file

* Removed incorrect comment

* Extra contructor

* Renamed client methods

* Cleanup config before saving

* Fixed broken controller

* Refactor custodian

* Fix build

* Make decimal fields strings to match the rest of Greenfield

* Improve parsing of % quantities

---------

Co-authored-by: d11n <mail@dennisreimann.de>
Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>

BTCPayServer.Client/Models/WithdrawRequestData.cs

@@ -1,13 +1,85 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+using System;
+using Newtonsoft.Json;
+using System.Net.Http.Headers;
+
 namespace BTCPayServer.Client.Models;
 
 public class WithdrawRequestData
 {
     public string PaymentMethod { set; get; }
-    public decimal Qty { set; get; }
+    [JsonConverter(typeof(JsonConverters.TradeQuantityJsonConverter))]
+    public TradeQuantity Qty { set; get; }
 
-    public WithdrawRequestData(string paymentMethod, decimal qty)
+    public WithdrawRequestData()
+    {
+        
+    }
+    
+    public WithdrawRequestData(string paymentMethod, TradeQuantity qty)
     {
         PaymentMethod = paymentMethod;
         Qty = qty;
     }
 }
+
+#nullable enable
+public record TradeQuantity
+{
+    public TradeQuantity(decimal value, ValueType type)
+    {
+        Type = type;
+        Value = value;
+    }
+
+    public enum ValueType
+    {
+        Exact,
+        Percent
+    }
+
+    public ValueType Type { get; }
+    public decimal Value { get; set; }
+
+    public override string ToString()
+    {
+        if (Type == ValueType.Exact)
+            return Value.ToString(CultureInfo.InvariantCulture);
+        else
+            return Value.ToString(CultureInfo.InvariantCulture) + "%";
+    }
+    public static TradeQuantity Parse(string str)
+    {
+        if (!TryParse(str, out var r))
+            throw new FormatException("Invalid TradeQuantity");
+        return r;
+    }
+    public static bool TryParse(string str, [MaybeNullWhen(false)] out TradeQuantity quantity)
+    {
+        if (str is null)
+            throw new ArgumentNullException(nameof(str));
+        quantity = null;
+        str = str.Trim();
+        str = str.Replace(" ", "");
+        if (str.Length == 0)
+            return false;
+        if (str[^1] == '%')
+        {
+            if (!decimal.TryParse(str[..^1], NumberStyles.Any, CultureInfo.InvariantCulture, out var r))
+                return false;
+            if (r < 0.0m)
+                return false;
+            quantity = new TradeQuantity(r, TradeQuantity.ValueType.Percent);
+        }
+        else
+        {
+            if (!decimal.TryParse(str, NumberStyles.Any, CultureInfo.InvariantCulture, out var r))
+                return false;
+            if (r < 0.0m)
+                return false;
+            quantity = new TradeQuantity(r, TradeQuantity.ValueType.Exact);
+        }
+        return true;
+    }
+}