using Deltares.Geometry;

namespace Deltares.Stability.Calculation2
{
    public class SlidingPlaneBelowSurfaceLineValidator : ISlidingCurveValidator
    {
        private const double delta = 0.00001;
        private GeometryPointString geometryPointString;

        public SlidingPlaneBelowSurfaceLineValidator(GeometryPointString geometryPointString)
        {
            this.geometryPointString = geometryPointString;
        }

        public bool IsValid(SlidingCurve slidingCurve)
        {
            if (slidingCurve is SlidingPlane)
            {
                foreach (var slice in slidingCurve.Slices)
                {
                    double bottomZ = (slice.BottomLeft.Y + slice.BottomRight.Y)/2;
                    double bottomX = (slice.BottomLeft.X + slice.BottomRight.X)/2;

                    double z = geometryPointString.GetZAtX(bottomX);

                    if (bottomZ > z + delta)
                    {
                        return false;
                    }
                }
            }

            return true;
        }

        public bool SlicesMustBeFilled()
        {
            return true;
        }
    }
}