namespace Yw.Curve
{
    /// <summary>
    /// 泵特性曲线辅助类
    /// </summary>
    public class PumpFeatHelper
    {
        /// <summary>
        /// 通过 频率 计算流量扬程曲线表达式
        /// </summary>
        public static CurveExpress CalcuCurveQhByHz(List<CurvePoint> pts, eFitType fit, double hz)
        {
            if (pts == null || pts.Count < 1)
            {
                return default;
            }
            var fitPow = FitHelper.GetFitPow(fit);
            if (pts.Count < fitPow + 1)
            {
                return default;
            }
            double f_ratio = hz / 50.0;
            var list = pts.Select(x => new CurvePoint(x.X * f_ratio, x.Y * f_ratio * f_ratio)).ToList();
            return FitHelper.BuildCurveExpress(list, fit);
        }

        /// <summary>
        /// 通过 频率 计算流量扬程曲线表达式
        /// </summary>
        public static CurveExpress CalcuCurveQhByHz(CurveExpress express, double hz, int? pointNumber = null)
        {
            if (!pointNumber.HasValue)
            {
                pointNumber = Settings.CurveParasHelper.Curve.PointNumber;
            }
            var pts = express.GetFitPoints(pointNumber.Value);
            return CalcuCurveQhByHz(pts, express.FitType, hz);
        }

        /// <summary>
        /// 通过 频率 计算流量功率曲线表达式
        /// </summary>
        public static CurveExpress CalcuCurveQpByHz(List<CurvePoint> pts, eFitType fit, double hz)
        {
            if (pts == null || pts.Count < 1)
            {
                return default;
            }
            var fitPow = FitHelper.GetFitPow(fit);
            if (pts.Count < fitPow + 1)
            {
                return default;
            }
            double f_ratio = hz / 50.0;
            var list = pts.Select(x => new CurvePoint(x.X * f_ratio, x.Y * f_ratio * f_ratio * f_ratio)).ToList();
            return FitHelper.BuildCurveExpress(list, fit);
        }

        /// <summary>
        /// 通过 频率 计算流量功率曲线表达式
        /// </summary>
        public static CurveExpress CalcuCurveQpByHz(CurveExpress express, double hz, int? pointNumber = null)
        {
            if (!pointNumber.HasValue)
            {
                pointNumber = Settings.CurveParasHelper.Curve.PointNumber;
            }
            var pts = express.GetFitPoints(pointNumber.Value);
            return CalcuCurveQpByHz(pts, express.FitType, hz);
        }


    }
}