using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Data;

public class Program

{

    public static void Main()

    {

        double baseAvgPrice = 100;

        ScoreItem left = new ScoreItem(baseAvgPrice, avgPrice:100, stddev:0, numFound:10);

        ScoreItem right = new ScoreItem(baseAvgPrice, avgPrice:170, stddev:100, numFound:100);

        Console.WriteLine(right > left);

    }

    public class ScoreItem

    {

        public ScoreItem(double directSearchBaseAvgPrice, double avgPrice, double stddev, long numFound)

        {

            this._directSearchBaseAvgPrice = directSearchBaseAvgPrice;

            this._avgPrice = avgPrice;

            this._stddev = stddev;

            this._numFound = numFound;

        }

​

        public static bool operator >(ScoreItem lhs, ScoreItem rhs)

        {

            if (平均與標準差都在合理範圍(lhs, lhs._directSearchBaseAvgPrice) && 平均與標準差都在合理範圍(rhs, rhs._directSearchBaseAvgPrice))

            {

                if (lhs._numFound >= rhs._numFound)

                {

                    return true;

                }

                else

                {

                    return false;

                }

            }

            else

            {

                return false; //無關勝負，再試別的吧

            }

        }

        public static bool operator <(ScoreItem lhs, ScoreItem rhs)

        {

           return !(lhs > rhs);

        }

​

         private static bool 平均與標準差都在合理範圍(ScoreItem aThis, double directSearchBaseAvgPrice)

        {

            PriceRangeHelper.InitPriceRangeDefaultArray();

            PriceRage foundPriceRange = PriceRangeHelper.GetPriceRange((int)aThis._directSearchBaseAvgPrice);

​

            return (aThis._stddev / directSearchBaseAvgPrice <= 1) &&

                (aThis._avgPrice <= (aThis._directSearchBaseAvgPrice * foundPriceRange.benefitSpace) && aThis._avgPrice >= (aThis._directSearchBaseAvgPrice * 0.5));

        }

​

        private double _directSearchBaseAvgPrice;

        private double _avgPrice;

        private double _stddev;

        private long _numFound;

    }

     public class PriceRangeHelper

    {

        //取屬性叫benefitSpace，顧名思義就是利潤空間。一般價格越低，越薄利，因此改用浮動的方式來設計

        public static void InitPriceRangeDefaultArray()

        {

            if (!isInitialized)

            {

                PriceRageDefaultArray[0].benefitSpace = 1.2; PriceRageDefaultArray[0].bottom = 100;

                PriceRageDefaultArray[1].benefitSpace = 1.25; PriceRageDefaultArray[1].bottom = 500;

                PriceRageDefaultArray[2].benefitSpace = 1.3; PriceRageDefaultArray[2].bottom = 1000;

                PriceRageDefaultArray[3].benefitSpace = 1.35; PriceRageDefaultArray[3].bottom = 2000;

                PriceRageDefaultArray[4].benefitSpace = 1.4; PriceRageDefaultArray[4].bottom = 5000;

                PriceRageDefaultArray[5].benefitSpace = 1.45; PriceRageDefaultArray[5].bottom = 10000;

                PriceRageDefaultArray[6].benefitSpace = 1.5; PriceRageDefaultArray[6].bottom = 50000;

                PriceRageDefaultArray[7].benefitSpace = 2; PriceRageDefaultArray[7].bottom = 9999999;

                isInitialized = true;

            }

        }

​

        //用來取得合理的價格區間

        //注意，要先呼叫InitPriceRangeDefaultArray

        public static PriceRage GetPriceRange(int price)

        {

            PriceRage foundPriceRange = PriceRageDefaultArray[0];

            for(int i = 0 ; i < 8 ; i++)

            {

                var pr = PriceRageDefaultArray[i];

                if (price <= pr.bottom)

                {

                    foundPriceRange = pr;

                    Console.WriteLine("bs:" + foundPriceRange.benefitSpace);

                    break;

                }

            };

            return foundPriceRange;

        }

​

        private static bool isInitialized = false;

        private static PriceRage[] PriceRageDefaultArray = new PriceRage[8];

    }

​

    public struct PriceRage

    {

        public int bottom;

        public double benefitSpace;

    }

}