using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Smuggler
{
    public class MeshPart
    {
        public IndexBuffer IndexBuffer { get; }
        public VertexBuffer VertexBuffer { get; }
        public Triangle[] Triangles { get; }
        public BasicEffect Effect { get; }

        public MeshPart(VertexBuffer vertexBuffer, IndexBuffer indexBuffer, Triangle[] triangles, BasicEffect effect)
        {
            VertexBuffer = vertexBuffer;
            IndexBuffer = indexBuffer;
            Triangles = triangles;
            Effect = effect;
        }

        public void Draw(GraphicsDevice graphicsDevice, Matrix world, Matrix view, Matrix projection)
        {
            graphicsDevice.SetVertexBuffer(VertexBuffer);
            graphicsDevice.Indices = IndexBuffer;

            Effect.World = world;
            Effect.View = view;
            Effect.Projection = projection;

            foreach (var pass in Effect.CurrentTechnique.Passes)
            {
                pass.Apply();
                
                graphicsDevice.DrawIndexedPrimitives(
                    PrimitiveType.TriangleList,
                    0,
                    0,
                    VertexBuffer.VertexCount,
                    0,
                    Triangles.Length
                );
            }
        }
    }
}