using StgSharp.Math;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;

namespace StgSharp.Graphics
{

    public class Uniform<T> where T : struct
    {
        internal int id;
        private IglFunc GL;

        internal unsafe Uniform(
            uint shaderID, string name, IglFunc gL)
        {
            byte[] namearray = Encoding.ASCII.GetBytes(name);
            GL = gL;
            fixed (byte* ptr = namearray)
            {
                id = GL.GetUniformLocation(shaderID, ptr);
            }
        }

        internal unsafe Uniform(int id)
        {
            this.id = id;
        }

    }


    public class Uniform<T, U>
        where T : struct
        where U : struct
    {
        internal int id;
        private IglFunc GL;

        internal unsafe Uniform(
            Shader program, string name, IglFunc glFunc)
        {
            byte[] namearray = Encoding.ASCII.GetBytes(name);
            GL = glFunc;
            fixed (byte* ptr = namearray)
            {
                id = GL.GetUniformLocation(program.programID, ptr);
            }
        }

        internal unsafe Uniform(int id)
        {
            this.id = id;
        }
    }

    public class Uniform<T, U, V>
        where T : struct
        where U : struct
        where V : struct
    {
        internal int id;
        private IglFunc GL;

        public unsafe Uniform(Shader program, string name, IglFunc glFunc)
        {
            byte[] namearray = Encoding.ASCII.GetBytes(name);
            GL = glFunc;
            fixed (byte* ptr = namearray)
            {
                id = GL.GetUniformLocation(program.programID, ptr);
            }
        }

        internal unsafe Uniform(int id)
        {
            this.id = id;
        }
    }

    public class Uniform<T, U, V, W>
        where T : struct
        where U : struct
        where V : struct
        where W : struct
    {
        internal int id;
        private IglFunc GL;

        internal unsafe Uniform(Shader program, string name, IglFunc glFunc)
        {
            byte[] namearray = Encoding.ASCII.GetBytes(name);
            fixed (byte* ptr = namearray)
            {
                id = GL.GetUniformLocation(program.programID, ptr);
            }
            GL = glFunc;
        }

        internal unsafe Uniform(int id)
        {
            this.id = id;
        }

    }

    internal partial class GLonRender : IglFunc
    {

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        unsafe void IglFunc.SetValue(Uniform<float> uniform, float v0)
        {
            api->glUniform1f(uniform.id, v0);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        unsafe void IglFunc.SetValue(Uniform<int> uniform, int i0)
        {
            api->glUniform1i(uniform.id, i0);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        unsafe void IglFunc.SetValue(Uniform<float, float> uniform, float v0, float v1)
        {
            api->glUniform2f(uniform.id, v0, v1);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        unsafe void IglFunc.SetValue(Uniform<float, float, float> uniform, float v0, float v1, float v2)
        {
            api->glUniform3f(uniform.id, v0, v1, v2);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        unsafe void IglFunc.SetValue(Uniform<float, float, float, float> uniform, float v0, float v1, float v2, float v3)
        {
            api->glUniform4f(uniform.id, v0, v1, v2, v3);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public unsafe void SetValue(Uniform<float, float, float, float> uniform, Vec4d vec)
        {
            api->glUniform1fv(uniform.id, 4, &vec);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public unsafe void SetValue(Uniform<Vec4d> uniform, Vec4d vec)
        {
            api->glUniform1fv(uniform.id, 4, &vec);
        }
    }

    internal partial class GLonUpdate
    {
        unsafe void IglFunc.SetValue(Uniform<float, float, float> uniform, float v0, float v1, float v2)
        {
            glActionQueue.Enqueue(
                () => { api->glUniform3f(uniform.id, v0, v1, v2); }
                );
        }

        unsafe void IglFunc.SetValue(Uniform<float, float> uniform, float v0, float v1)
        {
            glActionQueue.Enqueue(
                () => { api->glUniform2f(uniform.id, v0, v1); }
                );
        }

        unsafe void IglFunc.SetValue(Uniform<float, float, float, float> uniform, float v0, float v1, float v2, float v3)
        {
            glActionQueue.Enqueue(
                () => { api->glUniform4f(uniform.id, v0, v1, v2, v3); }
                );
        }

        unsafe void IglFunc.SetValue(Uniform<float, float, float, float> uniform, Vec4d vec)
        {
            glActionQueue.Enqueue(
                () =>
                {
                    Vec4d cache = vec;
                    api->glUniform1fv(uniform.id, 4, &cache);
                }
                );
        }

        unsafe void IglFunc.SetValue(Uniform<float> uniform, float v0)
        {
            glActionQueue.Enqueue(
                () => { api->glUniform1f(uniform.id, v0); }
                );
        }

        unsafe void IglFunc.SetValue(Uniform<int> uniform, int i0)
        {
            glActionQueue.Enqueue(
                () => { api->glUniform1d(uniform.id, i0); }
                );
        }

        unsafe void IglFunc.SetValue(Uniform<Vec4d> uniform, Vec4d vec)
        {
            glActionQueue.Enqueue(
                () =>
                {
                    Vec4d cache = vec;
                    api->glUniform1fv(uniform.id, 4, &cache);
                }
                );
        }
    }
}