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

namespace IStation.Model
{
    /// <summary>
    /// 相似换算辅助类
    /// </summary>
    public class SimilarCalculateHelper
    {
        /// <summary>
        /// 计算相似流量扬程曲线
        /// </summary>
        /// <param name="expressGroup">表达式</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param>
        /// <param name="pointNumber">拟合点数量</param>
        /// <returns></returns>
        public static FeatCurveExpressGroup Calculate(FeatCurveExpressGroup expressGroup, double originHz, double changeHz, int pointNumber = 12)
        {
            if (expressGroup == null)
                return null;
            if (changeHz < 1)
                return null;
            if (expressGroup.CurveQH == null)
                return null;
            var similarExpressGroup = new FeatCurveExpressGroup();
            similarExpressGroup.CurveQH = CalculateQH(expressGroup.CurveQH, originHz, changeHz, pointNumber);
            similarExpressGroup.CurveQP = CalculateQP(expressGroup.CurveQP, originHz, changeHz, pointNumber);
            similarExpressGroup.CurveQE = CalculateQE(expressGroup.CurveQE, originHz, changeHz, pointNumber);
            return similarExpressGroup;
        }

        /// <summary>
        /// 计算相似流量扬程曲线
        /// </summary>
        /// <param name="express">表达式</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param>
        /// <param name="pointNumber">拟合点数量</param>
        /// <returns></returns>
        public static CurveExpress CalculateQH(CurveExpress express, double originHz, double changeHz, int pointNumber = 12)
        {
            if (express == null)
                return null;
            if (changeHz < 1)
                return null;
            List<CurvePoint> fitPoints = null;
            if (express.DefinePoints != null && express.DefinePoints.Any())
                fitPoints = express.DefinePoints;
            else
                fitPoints = FitCurveHelper.GetFitPoints(express, pointNumber);

            var ratio = changeHz / originHz;
            var similarPoints = new List<CurvePoint>();
            foreach (CurvePoint fitPoint in fitPoints)
            {
                var similarPoint = new CurvePoint();
                similarPoint.X = fitPoint.X * ratio;
                similarPoint.Y = fitPoint.Y * ratio * ratio;
                similarPoints.Add(similarPoint);
            }
            return new CurveExpress(similarPoints, express.FitType);
        }

        /// <summary>
        /// 计算相似流量功率曲线
        /// </summary>
        /// <param name="express">表达式</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param>
        /// <param name="pointNumber">拟合点数量</param>
        /// <returns></returns>
        public static CurveExpress CalculateQP(CurveExpress express, double originHz, double changeHz, int pointNumber = 12)
        {
            if (express == null)
                return null;
            if (changeHz < 1)
                return null;
            List<CurvePoint> fitPoints = null;
            if (express.DefinePoints != null && express.DefinePoints.Any())
                fitPoints = express.DefinePoints;
            else
                fitPoints = FitCurveHelper.GetFitPoints(express, pointNumber);

            var ratio = changeHz / originHz;
            var similarPoints = new List<CurvePoint>();
            foreach (CurvePoint fitPoint in fitPoints)
            {
                var similarPoint = new CurvePoint();
                similarPoint.X = fitPoint.X * ratio;
                similarPoint.Y = fitPoint.Y * ratio * ratio * ratio;
                similarPoints.Add(similarPoint);
            }
            return new CurveExpress(similarPoints, express.FitType);
        }

        /// <summary>
        /// 计算相似流量效率曲线
        /// </summary>
        /// <param name="express">表达式</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param>
        /// <param name="pointNumber">拟合点数量</param>
        /// <returns></returns>
        public static CurveExpress CalculateQE(CurveExpress express, double originHz, double changeHz, int pointNumber = 12)
        {
            if (express == null)
                return null;
            if (changeHz < 1)
                return null;
            List<CurvePoint> fitPoints = null;
            if (express.DefinePoints != null && express.DefinePoints.Any())
                fitPoints = express.DefinePoints;
            else
                fitPoints = FitCurveHelper.GetFitPoints(express, pointNumber);

            var ratio = changeHz / originHz;
            var similarPoints = new List<CurvePoint>();
            foreach (CurvePoint fitPoint in fitPoints)
            {
                var similarPoint = new CurvePoint();
                similarPoint.X = fitPoint.X * ratio;
                similarPoint.Y = fitPoint.Y;
                similarPoints.Add(similarPoint);
            }
            return new CurveExpress(similarPoints, express.FitType);
        }


        /// <summary>
        /// 计算相似流量扬程点
        /// </summary>
        /// <param name="fitPoint">点</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param> 
        /// <returns></returns>
        public static CurvePoint CalculateQH(CurvePoint fitPoint, double originHz, double changeHz)
        {
            if (fitPoint == null)
                return null;
            if (changeHz < 1)
                return null;
            var ratio = changeHz / originHz;
            var similarPoint = new CurvePoint();
            similarPoint.X = fitPoint.X * ratio;
            similarPoint.Y = fitPoint.Y * ratio * ratio;
            return similarPoint;
        }

        /// <summary>
        /// 计算相似流量功率点
        /// </summary>
        /// <param name="express">点</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param> 
        /// <returns></returns>
        public static CurvePoint CalculateQP(CurvePoint fitPoint, double originHz, double changeHz)
        {
            if (fitPoint == null)
                return null;
            if (changeHz < 1)
                return null;
            var ratio = changeHz / originHz;
            var similarPoint = new CurvePoint();
            similarPoint.X = fitPoint.X * ratio;
            similarPoint.Y = fitPoint.Y * ratio * ratio * ratio;
            return similarPoint;
        }

        /// <summary>
        /// 计算相似流量效率点
        /// </summary>
        /// <param name="express">点</param>
        /// <param name="originHz">原始频率</param>
        /// <param name="changeHz">换算频率</param> 
        /// <returns></returns>
        public static CurvePoint CalculateQE(CurvePoint fitPoint, double originHz, double changeHz)
        {
            if (fitPoint == null)
                return null;
            if (changeHz < 1)
                return null;
            var ratio = changeHz / originHz;
            var similarPoint = new CurvePoint();
            similarPoint.X = fitPoint.X * ratio;
            similarPoint.Y = fitPoint.Y;

            return similarPoint;
        }

    }
}