using System;

using System.Collections.Generic;

​

public class CommissionSystem

{

    public enum CommissionType {

        Unknown = 0,

        Dynamic = 1,

        Static = 2

    }

    public class SalesSite {

        public decimal BaseCommissionModifier { get; set; } = 1m;

        public decimal GaurunteedMinimumCommission { get; set; } = 0m;

        public decimal AdditionalStaticCommission { get; set; } = 0m;

        public double AdditionalStaticCommissionItemThreshold { get; set; } = 0.0;

        public decimal CalculateCommission(decimal commissionableAmount, double averageItemsSold, CommissionType commissionType)

        {

            var commissionRate = commissionType switch {

                CommissionType.Dynamic => averageItemsSold > 4.9

                    ? 0.100m // 10%

                    : 0.075m, // 7.5%

                CommissionType.Static => 0.1m/3m, // 3 & 1/3%

                _ => 0m,

            };

            var baseCommission = commissionableAmount * commissionRate;

            var staticCommission = averageItemsSold >= AdditionalStaticCommissionItemThreshold

                ? AdditionalStaticCommission

                : 0m;

            var commission = (baseCommission * BaseCommissionModifier) + staticCommission;

            return Math.Max(commission, GaurunteedMinimumCommission);

        }

    }

    public SalesSite GetSalesSite(int siteId)

    {   

        return _siteRepo[siteId];

    }

    private static Dictionary<int, SalesSite> _siteRepo = new() {

        { 1, new SalesSite {} },

        { 3, new SalesSite { GaurunteedMinimumCommission = 200m } },

        { 4, new SalesSite { AdditionalStaticCommission = 40m } },

        { 5, new SalesSite { AdditionalStaticCommission = 40m, AdditionalStaticCommissionItemThreshold = 5} },

    };

}

​

// End Code Review. Below is just to get results

namespace Tester

{

    using System;

    public class Program

    {

        public static void Main()

        {

            var ammounts = new[] { 0m, 100m, 500m, 1000m, 5000m, 10000m, 100000m };

            var solds = new double[] { 0, 1, 2, 3, 4, 5, 10 };

            var sites = new[] { 1, 3, 4, 5 };

            var types = new[] { CommissionSystem.CommissionType.Dynamic, CommissionSystem.CommissionType.Static };

            var system = new CommissionSystem();

            Console.WriteLine("┌──────────────┬────────┬──────┬──────┬──────┐");

            Console.WriteLine("│    Result    │ Amount │ Sold │ Site │ Type │");

            Console.WriteLine("├──────────────┼────────┼──────┼──────┼──────┤");

            // order of foreach determines sort order

            foreach(var t in types)

            foreach(var s in sites)

            foreach(var u in solds)

            foreach(var a in ammounts)

            {

                var site = system.GetSalesSite(s);

                var result = site.CalculateCommission(a,u,t);

                Console.WriteLine("│ $ {0,10:0.000} │ {1,6} │  {2,2}  │  {3,2}  │  {4,2}  │", result, a, u, s, (int)t);

            }

            Console.WriteLine("└──────────────┴────────┴──────┴──────┴──────┘");

        }

    }

}

​

​