//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="TextureProvider.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.Mathematics.Graphic;

using System;
using System.Diagnostics.CodeAnalysis;

namespace StgSharp.Graphics
{
    public class TextureProvider : IImageProvider
    {

        private Vec2[] _texCoord;
        private Image _tex;

        public TextureProvider(Image image, Vec2[] coord)
        {
            _tex = image;
            _texCoord = coord;
        }

        public ref Vec2 this[int index]
        {
            get => ref _texCoord[index];
        }

        public Span<Vec2> TextureCoordinate
        {
            get => new Span<Vec2>(_texCoord);
        }

        public Image ProvideImage()
        {
            return _tex;
        }

        public void ReadImage(IImageProvider provider)
        {
            _tex = provider.ProvideImage();
        }

        public void UpdateFromImage([NotNull]Image i)
        {
            if (i == _tex) {
                return;
            }
            if (i.Size == _tex.Size)
            {
                _tex = i;
            } else
            {
                throw new ArgumentException(
                    $"Size of {nameof(i)} does not equals to current image.");
            }
        }

    }
}