using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Aiwaz.Contracts;
using SlimDX;
using Aiwaz.Resources.Attributes;
using System.Collections.ObjectModel;

namespace Aiwaz.Resources.Prefab
{
    [CreationParameters("Standard unity-sized non-inverted cube")]
    public class CubeParams : ICreationParams
    {
        public float Width;
        public float Height;
        public float Depth;
        public bool IsInverted;

        public CubeParams()
        {
            Width = 1.0f;
            Height = 1.0f;
            Depth = 1.0f;
            IsInverted = false;
        }
    }

    [AiwazResource("Cube", "A simple non-uniform cube")]
    public class Cube : Resource
    {
        public struct CommonCubeVertex
        {
            public CommonCubeVertex(SlimDX.Vector3 pos,
                                    SlimDX.Vector3 normal,
                                    SlimDX.Vector3 tangent,
                                    SlimDX.Vector2 tex)
            {
                this.Pos = pos;
                this.Normal = normal;
                this.Tangent = tangent;
                this.Tex = tex;
            }
            public SlimDX.Vector3 Pos;
            public SlimDX.Vector3 Normal;
            public SlimDX.Vector3 Tangent;
            public SlimDX.Vector2 Tex;
        };

        public GeometryBuffer GeometryBuffer { get; protected set; }

        public Cube(CubeParams parameters)
        {
            creationParams = parameters;
            float width = parameters.Width * 0.5f;
            float height = parameters.Height * 0.5f;
            float depth = parameters.Depth * 0.5f;

            float normal = parameters.IsInverted ? -1.0f : 1.0f;
	        float tangent = 1.0f;//isInverted ? -1.0f : 1.0f;
            CommonCubeVertex[] vertices = new CommonCubeVertex[]
	        {
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, height, -depth ),	new SlimDX.Vector3(0.0f, normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, height, -depth ),	    new SlimDX.Vector3(0.0f, normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, height, depth ),		new SlimDX.Vector3(0.0f, normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, height, depth ),	    new SlimDX.Vector3(0.0f, normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 1.0f ) ),

		        new CommonCubeVertex ( new SlimDX.Vector3( -width, -height, -depth ),	new SlimDX.Vector3(0.0f, -normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, -height, -depth ),	new SlimDX.Vector3(0.0f, -normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, -height, depth ),	    new SlimDX.Vector3(0.0f, -normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, -height, depth ),	new SlimDX.Vector3(0.0f, -normal, 0.0f), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 1.0f ) ),

		        new CommonCubeVertex ( new SlimDX.Vector3( -width, -height, depth ),	new SlimDX.Vector3(-normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, tangent, 0.0f), new SlimDX.Vector2( 0.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, -height, -depth ),	new SlimDX.Vector3(-normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, tangent, 0.0f), new SlimDX.Vector2( 1.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, height, -depth ),	new SlimDX.Vector3(-normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, tangent, 0.0f), new SlimDX.Vector2( 1.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, height, depth ),	    new SlimDX.Vector3(-normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, tangent, 0.0f), new SlimDX.Vector2( 0.0f, 0.0f ) ),

		        new CommonCubeVertex ( new SlimDX.Vector3( width, -height, depth ),	    new SlimDX.Vector3(normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, -tangent, 0.0f), new SlimDX.Vector2( 1.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, -height, -depth ),	new SlimDX.Vector3(normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, -tangent, 0.0f), new SlimDX.Vector2( 0.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, height, -depth ),	    new SlimDX.Vector3(normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, -tangent, 0.0f), new SlimDX.Vector2( 0.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, height, depth ),		new SlimDX.Vector3(normal, 0.0f, 0.0f), new SlimDX.Vector3(0.0f, -tangent, 0.0f), new SlimDX.Vector2( 1.0f, 0.0f ) ),

		        new CommonCubeVertex ( new SlimDX.Vector3( -width, -height, -depth ),	new SlimDX.Vector3(0.0f, 0.0f, -normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, -height, -depth ),	new SlimDX.Vector3(0.0f, 0.0f, -normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, height, -depth ),	    new SlimDX.Vector3(0.0f, 0.0f, -normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, height, -depth ),	new SlimDX.Vector3(0.0f, 0.0f, -normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 0.0f ) ),

		        new CommonCubeVertex ( new SlimDX.Vector3( -width, -height, depth ),	new SlimDX.Vector3(0.0f, 0.0f, normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, -height, depth ),	    new SlimDX.Vector3(0.0f, 0.0f, normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 1.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( width, height, depth ),		new SlimDX.Vector3(0.0f, 0.0f, normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 0.0f, 0.0f ) ),
		        new CommonCubeVertex ( new SlimDX.Vector3( -width, height, depth ),	    new SlimDX.Vector3(0.0f, 0.0f, normal), new SlimDX.Vector3(-tangent, 0.0f, 0.0f), new SlimDX.Vector2( 1.0f, 0.0f ) ),
	        };

            var vertexElements = new VertexElement[]
            {
                new VertexElement(VertexElement.Format.Position),
                new VertexElement(VertexElement.Format.Normal),
                new VertexElement(VertexElement.Format.Tangent),
                new VertexElement(VertexElement.Format.Texture2D)
            };

	        var invertedIndices = new uint[] { 0,1,3, 3,1,2, 5,4,6, 6,4,7, 8,9,11, 11,9,10, 13,12,14, 14,12,15, 16,17,19, 19,17,18, 21,20,22, 22,20,23 };
	        var normalIndices = new uint[] { 3,1,0, 2,1,3, 6,4,5, 7,4,6, 11,9,8, 10,9,11, 14,12,13, 15,12,14, 19,17,16, 18,17,19, 22,20,21, 23,20,22 };

            this.GeometryBuffer = GeometryBuffer.Create<CommonCubeVertex>(
                parameters.IsInverted ? invertedIndices : normalIndices,
                vertices,
                vertexElements,
                false);
        }

        private ICreationParams creationParams;
        public override ICreationParams CreationParams
        {
            get { return creationParams; }
        }

        private ObservableCollection<IResource> children;
        [ReadOnly]
        public override ObservableCollection<IResource> Children
        {
            get
            {
                if (children == null)
                {
                    children = new ObservableCollection<IResource>();
                    children.Add(GeometryBuffer);
                }
                return children;
            }
        }
    }
}