using System;
using System.Collections.Generic;
using System.Linq;

namespace TProduct.OpenDto
{
    public class ValueCoeffParas
    {
        public ValueCoeffParas() { }

 
        /// <summary>
        /// 方法
        /// </summary>
        public int Method { get; set; }

        /// <summary>
        /// 相乘
        /// </summary>
        public double Multiply1 { get; set; } = 1;

        /// <summary>
        /// 相加
        /// </summary>
        public double Add1 { get; set; } = 0;

        /// <summary>
        /// 插值方法 0 不插值  1 插值
        /// </summary>
        public int InterpolationType { get; set; } = 0;
        /// <summary>
        ///  
        /// </summary>
        public List<double> RealValues { get; set; }

        /// <summary>
        ///  
        /// </summary>
        public List<double> Multiplys { get; set; }

        /// <summary>
        ///  
        /// </summary>
        public List<double> Adds { get; set; }


        public double CalcRealValue(double v)
        {
            if (Method == 0)
                return v;
            else if (Method == 1)
                return v * Multiply1 + Add1;
            else if (Method == 2)
                return CalcRealValue2(v);
            else
                return v;
        }
        private double CalcRealValue2(double v)
        {
            if (this.RealValues == null || this.RealValues.Count() < 2)
                return v;
            if (this.Multiplys == null || this.Multiplys.Count() < 2)
                return v;
            if (this.Adds == null || this.Adds.Count() < 2)
                return v;
            if (this.InterpolationType == 0)
            {//不插值
                for (int i = 0; i < this.RealValues.Count; i++)
                {
                    if (v <= this.RealValues[i])
                        return v * this.Multiplys[i] + this.Adds[i];
                }
                return v * this.Multiplys.Last() + this.Adds.Last();
            }
            else
            {//插值
                if (v <= this.RealValues[0])
                    return v * this.Multiplys[0] + this.Adds[0];

                for (int i = 1; i < this.RealValues.Count; i++)
                {
                    if (v <= this.RealValues[i])
                    {// 
                        if (this.RealValues[i] == this.RealValues[i - 1])
                            return this.RealValues[i] * this.RealValues[i] + this.Adds[i];
                        var lll = this.RealValues[i - 1] * this.RealValues[i - 1] + this.Adds[i - 1];
                        var ccc = this.RealValues[i] * this.RealValues[i] + this.Adds[i];
                        return lll + (v - this.RealValues[i - 1]) * (ccc - lll)
                             / (this.RealValues[i] - this.RealValues[i - 1]);
                    }
                }

                return v * this.Multiplys.Last() + this.Adds.Last();
            }

        }
 
    }
}