using System;
using System.IO;

using OpenTK.Graphics.OpenGL;

namespace org.budnhead.graphics
{
	public class Shader
	{
		private int id;

		private ShaderType shaderType;
		private String source;

		public Shader(ShaderType shaderType, String source)
		{
			this.id = GL.CreateShader(shaderType);

			this.shaderType = shaderType;
				this.source = source;

			compile();
		}

		public int ID
		{
			get { return this.id; }
		}

		public Shader(ShaderType shaderType, FileStream file)
		{
			this.id = GL.CreateShader(shaderType);
			this.shaderType = shaderType;

			StreamReader sr = new StreamReader(file);
			this.source = sr.ReadToEnd();


			compile();
		}

		private void compile()
		{
			int result;

			GL.ShaderSource(this.id, source);
			GL.CompileShader(this.id);

			string msg = GL.GetShaderInfoLog((int)this.id);
			GL.GetShader(this.id, ShaderParameter.CompileStatus, out result);

			if (result != 1){
				Console.WriteLine("Shader compile failed: {0}", msg);
				throw new Exception(String.Format("OpenGL: Shader did not compile. ({0})",msg));
			}

		}

		public ShaderType ShaderType
		{
			get { return this.shaderType; }
		}
	}
}