using StgSharp.Geometries;
using StgSharp.Math;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StgSharp.Graphics
{
    public class PlainGeometryMesh
    {
        private IGeometry _shape;
        private Image _texture;
        private vec2d[] textureCoord;

        public PlainGeometryMesh(
            IGeometry shape, Image texture, IEnumerable<vec2d> texCoord
            )
        {
            if (shape==null)
            {
                throw new ArgumentNullException(nameof(shape));
            }
            if (texCoord == null)
            {
                throw new ArgumentNullException(nameof(texCoord));
            }

            _shape = shape;
            textureCoord = new vec2d[shape.VertexCount];
            _texture = texture;
            if (texCoord is not vec2d[] source)
            {
                source = texCoord.ToArray();
            }
            if (textureCoord.Length > source.Length)
            {
                throw new ArgumentException(paramName: nameof(texCoord), message: "Amount of texture coordination is too less");
            }
            Array.Copy(sourceArray: source, textureCoord, textureCoord.Length);
            return;

        }

        public ReadOnlySpan<int> MeshIndices => _shape.VertexIndices;

        public vec4d[] VertexArray => _shape.VertexStream;

        public Image Texture 
        {
            get => _texture;
            internal set => _texture = value;
        }
        
        public vec2d[] TextureCoord => textureCoord;
    }
}