using System;
using System.Text;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using libsecondlife;

namespace sceneviewer.Prims
{
    public abstract class PrimVisual
    {
        // Constants
        public const int MaxCut = 200;

        public Matrix Matrix;
        public VertexPositionColor[] VertexArray;
        public PrimObject Prim;
        public Vector3 Acceleration;
        public Vector3 Velocity;
        public Vector3 RotationVelocity;
        public int LevelOfDetail = 16;

        // Accessors
        public abstract int TriangleCount { get; }
        //public abstract int Twist { set; get; }
        //public abstract double Shear { set; get; }
        //public abstract double TopSizeX { set; get;}
        //public abstract double TopSizeY { set; get; }
        //public abstract int CutStart { set; get; }
        //public abstract int CutEnd { set; get; }
        //public virtual int AdvancedCutStart { set { } get { return 0; } }
        //public virtual int AdvancedCutEnd { set { } get { return 0; } }
        //public abstract int Hollow { set; get; }

        protected const int MaxFaces = 9;

        protected bool hollow;
        protected bool cut;

        protected List<VertexPositionColor> Vertexes;
        protected Color[] FaceColors = new Color[MaxFaces];

        // Abstract methods
        protected abstract void BuildFaces();
        protected abstract void AssignFaces();

        public PrimVisual(PrimObject prim)
        {
            Prim = prim;
            Vertexes = new List<VertexPositionColor>();
            VertexArray = Vertexes.ToArray();

            Acceleration = Vector3.Zero;
            Velocity = Vector3.Zero;
            RotationVelocity = Vector3.Zero;

            BuildMatrix();
        }

        public void Update(PrimUpdate primUpdate)
        {
            Prim.Position = primUpdate.Position;
            Prim.Rotation = primUpdate.Rotation;
            Acceleration = new Vector3(primUpdate.Acceleration.X, primUpdate.Acceleration.Y, primUpdate.Acceleration.Z);
            Velocity = new Vector3(primUpdate.Velocity.X, primUpdate.Velocity.Y, primUpdate.Velocity.Z);
            RotationVelocity = new Vector3(primUpdate.RotationVelocity.X, primUpdate.RotationVelocity.Y, primUpdate.RotationVelocity.Z);

            BuildMatrix();
        }

        private void BuildMatrix()
        {
            Matrix offset = Matrix.CreateTranslation(new Vector3(Prim.Position.X, Prim.Position.Y, Prim.Position.Z));
            Matrix rotation = Matrix.FromQuaternion(new Quaternion(Prim.Rotation.X, Prim.Rotation.Y, Prim.Rotation.Z,
                Prim.Rotation.W));
            Matrix scaling = Matrix.CreateScale(Prim.Scale.X, Prim.Scale.Y, Prim.Scale.Z);

            Matrix = scaling * rotation * offset;
        }

        public static PrimVisual BuildPrimVisual(PrimObject prim)
        {
            if (prim.ProfileCurve == 1 && prim.PathCurve == 16)
            {
                // PRIM_TYPE_BOX
                return new PrimVisualBox(prim);
            }
            else if (prim.ProfileCurve == 0 && prim.PathCurve == 16)
            {
                // PRIM_TYPE_CYLINDER
                return new PrimVisualCylinder(prim);
            }
            else if (prim.ProfileCurve == 3 && prim.PathCurve == 16)
            {
                // PRIM_TYPE_PRISM
                return new PrimVisualPrism(prim);
            }
            else if (prim.ProfileCurve == 5 && prim.PathCurve == 32)
            {
                // PRIM_TYPE_SPHERE
                return new PrimVisualSphere(prim);
            }
            else if (prim.ProfileCurve == 0 && prim.PathCurve == 32)
            {
                // PRIM_TYPE_TORUS
                return new PrimVisualTorus(prim);
            }
            else if (prim.ProfileCurve == 1 && prim.PathCurve == 32)
            {
                // PRIM_TYPE_TUBE
                return new PrimVisualTube(prim);
            }
            else if (prim.ProfileCurve == 3 && prim.PathCurve == 32)
            {
                // PRIM_TYPE_RING
                return new PrimVisualRing(prim);
            }
            else
            {
                return null;
            }
        }
    }
}