using StgSharp.Controlling;
using StgSharp.Math;

namespace StgSharp.Geometries
{
    internal class Parallelogram : Polygon4
    {
        internal Point center;

        public sealed override Point RefPoint0 => center;
        public sealed override Point RefPoint1 => new Point(vertexMat.mat.colum0);
        public sealed override Point RefPoint2 => new Point(vertexMat.mat.colum1);

        internal readonly GetLocationHandler movCenterOperation = new GetLocationHandler(GeometryOperation.DefualtMotion);

        public GetLocationHandler MovCenterOperation { get { return movCenterOperation; } }
        public GetLocationHandler MovVertex01Operation { get { return moveVertex0Operation; } }
        public GetLocationHandler MovVertex02Operation { get { return moveVertex1Operation; } }

        public virtual Vec3d MovCenter(uint tick)
        {
            return movCenterOperation.Invoke(tick);
        }

        /// <summary>
        /// Move the third vertix. this is a useless method for Parallelograms.
        /// </summary>
        /// <param name="tick">Current time tick</param>
        /// <returns></returns>
        /// <exception cref="UnusedVertexException">Geometry overdefined</exception>
        public sealed override Vec3d MoveVertex2(uint tick)
        {
            throw new UnusedVertexException();
        }

        /// <summary>
        /// Move the third vertix. This method is useless for Parallelograms.
        /// </summary>
        /// <param name="tick">Current time tick</param>
        /// <returns></returns>
        /// <exception cref="UnusedVertexException">Geometry overdefined</exception>
        public sealed override Vec3d MoveVertex3(uint tick)
        {
            throw new UnusedVertexException();
        }

        internal sealed override void OnRender(uint tick)
        {
            uint nowTick = TimeLine.tickCounter._value;
            this.vertexMat.Colum0 = RefOrigin.Position + moveVertex0Operation(nowTick);
            this.vertexMat.Colum1 = RefOrigin.Position + moveVertex1Operation(nowTick);
            this.vertexMat.Colum2 = center.Position * 2 - vertexMat.Colum0;
            this.vertexMat.Colum3 = center.Position * 2 - vertexMat.Colum1;
        }

    }
}