CryptoExchange.Net/CryptoExchange.Net/SharedApis/V2/Trades/GetRecentTrades/GetRecentTradesOptions.cs

using CryptoExchange.Net.Objects;
using System.Text;

namespace CryptoExchange.Net.SharedApis
{
    /// <summary>
    /// Options for requesting recent trades
    /// </summary>
    public class GetRecentTradesOptions : CapabilityOptions<GetRecentTradesRequest, IGetRecentTrades>
    {
        /// <inheritdoc />
        public override string Description => "Retrieve recent public trades for a symbol";

        private static readonly RequestParameterDescription[] _defaultParameterRules = new[]
        {
            RequestParameterRule<GetRecentTradesRequest>.Required(x => x.Symbol, "The symbol to retrieve recent trades for", new SharedSymbol(TradingMode.Spot, "ETH", "USDT")),
            RequestParameterRule<GetRecentTradesRequest>.Optional(x => x.Limit, "Limit the result set to a maximum number of items", 100),
        };

        /// <summary>
        /// The max number of trades that can be requested
        /// </summary>
        public int MaxLimit { get; set; }

        /// <summary>
        /// ctor
        /// </summary>
        public GetRecentTradesOptions(string exchange, int limit, bool authenticated) 
            : base(exchange, authenticated, nameof(IGetRecentTrades.GetRecentTradesAsync), _defaultParameterRules)
        {
            MaxLimit = limit;
        }

        /// <inheritdoc />
        public override Error? ValidateRequest(GetRecentTradesRequest request, IGetRecentTrades client)
        {
            var baseError = base.ValidateRequest(request, client);
            if (baseError != null)
                return baseError;

            if (request.Limit > MaxLimit)
                return ArgumentError.Invalid(nameof(GetRecentTradesRequest.Limit), $"Only the most recent {MaxLimit} trades are available");

            return null;
        }

        /// <inheritdoc />
        public override string ToString()
        {
            var sb = new StringBuilder(base.ToString());
            sb.AppendLine($"  Max data points:                {MaxLimit}");
            return sb.ToString();
        }
    }
}