btcpayserver/BTCPayServer/Models/StoreViewModels/RatesViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using BTCPayServer.Rating;
using BTCPayServer.Services.Rates;
using Microsoft.AspNetCore.Mvc.Rendering;

namespace BTCPayServer.Models.StoreViewModels
{
    public class RatesViewModel
    {
        public class TestResultViewModel
        {
            public string CurrencyPair { get; set; }
            public string Rule { get; set; }
            public bool Error { get; set; }
        }

        public void SetExchangeRates(IEnumerable<RateSourceInfo> supportedList, string preferredExchange)
        {
            supportedList = supportedList.ToArray();
            var chosen = supportedList.FirstOrDefault(f => f.Id == preferredExchange) ?? supportedList.FirstOrDefault();
            Exchanges = new SelectList(supportedList, nameof(chosen.Id), nameof(chosen.DisplayName), chosen);
            PreferredExchange = chosen?.Id;
            RateSource = chosen?.Url;
        }

        public List<TestResultViewModel> TestRateRules { get; set; }

        public SelectList Exchanges { get; set; }

        public bool ShowScripting { get; set; }

        [Display(Name = "Rate Rules")]
        [MaxLength(2000)]
        public string Script { get; set; }
        public string DefaultScript { get; set; }
        public string ScriptTest { get; set; }
        public string DefaultCurrencyPairs { get; set; }
        public string StoreId { get; set; }
        public IEnumerable<RateSourceInfo> AvailableExchanges { get; set; }

        [Display(Name = "Add Exchange Rate Spread")]
        [Range(0.0, 100.0)]
        public double Spread { get; set; }

        [Display(Name = "Preferred Price Source")]
        public string PreferredExchange { get; set; }

        public string RateSource { get; set; }
    }
}