using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Mesnac.Maths;

namespace Mesnac.Math.New
{
    public class Straight : IMath
    {
        private object NullResult = null;

        public string Name
        {
            get { return "直线"; }
        }

        public string Caption
        {
            get
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendLine("生成从第一个值开始，第二个值结束的int类型数据");
                sb.AppendLine("例：");
                sb.Append("    ").Append(Name).AppendLine("(11,20)");
                return sb.ToString();
            }
        }

        public object Execute(string[] parameters, object[] buff)
        {
            if (buff.Length == 0)
            {
                return this.NullResult;
            }
            if (buff[0] == null)
            {
                return this.NullResult;
            }
            int index = 0;
            if (!int.TryParse(buff[0].ToString(), out index))
            {
                return this.NullResult;
            }
            if (parameters.Length < 2)
            {
                return this.NullResult;
            }
            int iStart = 0;
            int iEnd = 0;
            if (!int.TryParse(parameters[0], out iStart))
            {
                return this.NullResult;
            }
            if (!int.TryParse(parameters[1], out iEnd))
            {
                return this.NullResult;
            }
            if (iEnd == iStart)
            {
                return iStart;
            }
            if (iEnd > iStart)
            {
                iStart = iStart - 1;
            }
            else
            {
                iStart = iStart + 1;
            }
            int iLen = System.Math.Abs(iEnd - iStart);
            int Result = index;
            if (Result > iLen)
            {
                Result = Result % iLen;
                if (Result == 0)
                {
                    Result = iLen;
                }
            }
            if (iEnd > iStart)
            {
                return iStart + Result;
            }
            else
            {
                return iStart - Result;
            }
        }
    }

    public class BrokenLine : IMath
    {
        private object NullResult = null;

        public string Name
        {
            get { return "折线"; }
        }

        public string Caption
        {
            get
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendLine("生成从第一个值开始，到达第二个值后返回第一个值结束的int类型数据");
                sb.AppendLine("例：");
                sb.Append("    ").Append(Name).AppendLine("(11,20)");
                return sb.ToString();
            }
        }

        public object Execute(string[] parameters, object[] buff)
        {
            if (buff.Length == 0)
            {
                return this.NullResult;
            }
            if (buff[0] == null)
            {
                return this.NullResult;
            }
            int index = 0;
            if (!int.TryParse(buff[0].ToString(), out index))
            {
                return this.NullResult;
            }
            if (parameters.Length < 2)
            {
                return this.NullResult;
            }
            int iStart = 0;
            int iEnd = 0;
            if (!int.TryParse(parameters[0], out iStart))
            {
                return this.NullResult;
            }
            if (!int.TryParse(parameters[1], out iEnd))
            {
                return this.NullResult;
            }
            if (iEnd == iStart)
            {
                return iStart;
            }
            if (iEnd > iStart)
            {
                iStart = iStart - 1;
            }
            else
            {
                iStart = iStart + 1;
            }
            int iLen = System.Math.Abs(iEnd - iStart) * 2 - 2;
            int Result = index;
            if (Result > iLen)
            {
                Result = Result % iLen;
                if (Result == 0)
                {
                    Result = iLen;
                }
            }
            if (iEnd > iStart)
            {
                Result = iStart + Result;
                if (Result > iEnd)
                {
                    Result = iEnd - (Result - iEnd);
                }
            }
            else
            {
                Result = iStart - Result;
                if (Result < iEnd)
                {
                    Result = iEnd + iEnd - Result;
                }
            }
            return Result;
        }
    }

    public class Random : IMath
    {
        private object NullResult = null;
        private static System.Random random = new System.Random((int)DateTime.Now.Ticks + +System.Threading.Thread.CurrentThread.ManagedThreadId);

        public string Name
        {
            get { return "随机数"; }
        }

        public string Caption
        {
            get
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendLine("产生一个两个参数之间的double类型的随机数");
                sb.AppendLine("例：");
                sb.Append("    ").Append(Name).AppendLine("(11,20)");
                return sb.ToString();
            }
        }

        public object Execute(string[] parameters, object[] buff)
        {

            if (buff.Length == 0)
            {
                return this.NullResult;
            }
            if (buff[0] == null)
            {
                return this.NullResult;
            }
            int index = 0;
            if (!int.TryParse(buff[0].ToString(), out index))
            {
                return this.NullResult;
            }
            if (parameters.Length < 2)
            {
                return 0;
            }
            double iStart = 0;
            double iEnd = 0;
            if (!double.TryParse(parameters[0], out iStart))
            {
                return this.NullResult;
            }
            if (!double.TryParse(parameters[1], out iEnd))
            {
                return this.NullResult;
            }
            
            random.NextDouble();
            double d = random.NextDouble();
            return d * (iEnd - iStart) + iStart;
        }
    }


    public class RandomInt : IMath
    {
        private object NullResult = null;
        private static System.Random random = new System.Random((int)DateTime.Now.Ticks + System.Threading.Thread.CurrentThread.ManagedThreadId);

        public string Name
        {
            get { return "整数随机数"; }
        }

        public string Caption
        {
            get
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendLine("产生一个两个参数之间的int类型的随机数");
                sb.AppendLine("例：");
                sb.Append("    ").Append(Name).AppendLine("(11,20)");
                return sb.ToString();
            }
        }

        public object Execute(string[] parameters, object[] buff)
        {

            if (buff.Length == 0)
            {
                return this.NullResult;
            }
            if (buff[0] == null)
            {
                return this.NullResult;
            }
            int index = 0;
            if (!int.TryParse(buff[0].ToString(), out index))
            {
                return this.NullResult;
            }
            if (parameters.Length < 2)
            {
                return 0;
            }
            int iStart = 0;
            int iEnd = 0;
            if (!int.TryParse(parameters[0], out iStart))
            {
                return this.NullResult;
            }
            if (!int.TryParse(parameters[1], out iEnd))
            {
                return this.NullResult;
            }
            random.Next();
            int result = 0;
            if (iStart == iEnd)
            {
                result = iStart;
            }
            if (iStart > iEnd)
            {
                result = random.Next(iEnd, iStart);
            }
            result = random.Next(iStart, iEnd);
            return result;
        }
    }
}