//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="PlainGeometryMesh.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     Permission is hereby granted, free of charge, to any person 
//     obtaining a copy of this software and associated documentation 
//     files (the “Software”), to deal in the Software without restriction, 
//     including without limitation the rights to use, copy, modify, merge,
//     publish, distribute, sublicense, and/or sell copies of the Software, 
//     and to permit persons to whom the Software is furnished to do so, 
//     subject to the following conditions:
//     
//     The above copyright notice and 
//     this permission notice shall be included in all copies 
//     or substantial portions of the Software.
//     
//     THE SOFTWARE IS PROVIDED “AS IS”, 
//     WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
//     INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
//     IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
//     DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
//     ARISING FROM, OUT OF OR IN CONNECTION WITH 
//     THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//     
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using StgSharp.Geometries;
using StgSharp.Math;

using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace StgSharp.Graphics
{
    public class PlainGeometryMesh
    {

        private PlainGeometry _shape;
        private TextureProvider _texture;

        public PlainGeometryMesh(
                       [NotNull] PlainGeometry shape,
                       [NotNull] TextureProvider texture )
        {
            if( shape.VertexCount > texture.TextureCoordinate.Length ) {
                throw new ArgumentException(
                    paramName: nameof( texture ),
                    message: "Amount of texture coordination is too less" );
            }
            _texture = texture;
            _shape = shape;
        }

        //private Image _texture;

        public PlainGeometryMesh(
                       PlainGeometry shape,
                       Image texture,
                       Vec2[] texCoord )
        {
            ArgumentNullException.ThrowIfNull( shape );
            ArgumentNullException.ThrowIfNull( texCoord );

            if( shape.VertexCount > texCoord.Length ) {
                throw new ArgumentException(
                    paramName: nameof( texCoord ),
                    message: "Amount of texture coordination is too less" );
            }
            _texture = new TextureProvider( texture, texCoord );
        }

        public Vec4[] VertexArray => _shape.VertexStream;

        public Image TextureImage
        {
            get => _texture.ProvideImage();
            internal set => _texture.ReadImage( value );
        }

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

        public ReadOnlySpan<Vec4> TextureCoord => MemoryMarshal.Cast<Vec2, Vec4>(
            _texture.TextureCoordinate );

        public PlainGeometryMesh Resize( PlainGeometry newShape )
        {
            return new PlainGeometryMesh( newShape, _texture );
        }

    }
}