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 glSHandle id;
        private IglFunc GL;

        internal unsafe Uniform(
            ShaderProgram program, string name, IglFunc gl)
        {
            GL = gl;
            id = GL.GetUniformLocation(program.handle, name);
        }

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

    }


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

        internal unsafe Uniform(
            ShaderProgram program, string name, IglFunc gl)
        {
            GL = gl;
            id = GL.GetUniformLocation(program.handle, name);
        }

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

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

        public unsafe Uniform(ShaderProgram program, string name, IglFunc gl)
        {
            GL = gl;
            id = GL.GetUniformLocation(program.handle, name);
        }

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

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

        internal unsafe Uniform(ShaderProgram program, string name, IglFunc gl)
        {
            GL = gl;
            id = GL.GetUniformLocation(program.handle, name);
        }

        internal unsafe Uniform(glSHandle 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.DirectValue, v0);
        }

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

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

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        unsafe void IglFunc.SetValue(Uniform<float, float, float> uniform, float v0, float v1, float v2)
        {
            api->glUniform3f(uniform.id.DirectValue, 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.DirectValue, v0, v1, v2, v3);
        }

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

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

    internal unsafe partial class GLonUpdate
    {
        private IntPtr UniformVal1fPtr = (IntPtr)(delegate*<void>)&UniformVal1f;
        private IntPtr UniformVal1fvPtr = (IntPtr)(delegate*<void>)&UniformVal1fv;
        private IntPtr UniformVal1iPtr = (IntPtr)(delegate*<void>)&UniformVal1i;
        private IntPtr UniformVal2fPtr = (IntPtr)(delegate*<void>)&UniformVal2f;
        private IntPtr UniformVal3fPtr = (IntPtr)(delegate*<void>)&UniformVal3f;
        private IntPtr UniformVal4fPtr = (IntPtr)(delegate*<void>)&UniformVal4f;

        unsafe void IglFunc.SetValue(Uniform<float, float, float> uniform, float f0, float f1, float f2)
        {
            paramQueue.Enqueue((IntPtr)uniform.id.valuePtr);
            paramQueue.Enqueue(f0, f1, f2);
            glActionQueue.Enqueue(UniformVal3fPtr);
        }

        unsafe void IglFunc.SetValue(Uniform<float, float> uniform, float f0, float f1)
        {
            M128 m = default;
            m.UInt64[0] = (ulong)uniform.id.valuePtr;
            m.Single[2] = f0; m.Single[3] = f1;
            paramQueue.Enqueue(m);
            glActionQueue.Enqueue(UniformVal2fPtr);
        }

        unsafe void IglFunc.SetValue(Uniform<float, float, float, float> uniform, float f0, float f1, float f2, float f3)
        {
            paramQueue.Enqueue((IntPtr)uniform.id.valuePtr);
            paramQueue.Enqueue(f0, f1, f2, f3);
            glActionQueue.Enqueue(UniformVal4fPtr);
        }

        unsafe void IglFunc.SetValue(Uniform<float, float, float, float> uniform, Vec4d vec)
        {
            Vec4d m = vec;
            paramQueue.Enqueue((IntPtr)uniform.id.valuePtr, (IntPtr)(Vec4d*)&m);
            glActionQueue.Enqueue(UniformVal1fvPtr);
        }

        unsafe void IglFunc.SetValue(Uniform<float> uniform, float f0)
        {
            M128 m = default;
            m.UInt64[0] = (ulong)uniform.id.valuePtr;
            m.Single[2] = f0;
            paramQueue.Enqueue(m);
            glActionQueue.Enqueue(UniformVal1fPtr);
        }

        unsafe void IglFunc.SetValue(Uniform<int> uniform, int i0)
        {
            M128 m = default;
            m.UInt64[0] = (ulong)uniform.id.valuePtr;
            m.Int32[2] = i0;
            paramQueue.Enqueue(m);
            glActionQueue.Enqueue(UniformVal1fPtr);
        }

        unsafe void IglFunc.SetValue(Uniform<Vec4d> uniform, Vec4d vec)
        {
            Vec4d m = vec;
            paramQueue.Enqueue((IntPtr)uniform.id.valuePtr, (IntPtr)(Vec4d*)&m);
            glActionQueue.Enqueue(UniformVal1fvPtr);
        }

        private static void UniformVal1f()
        {
            M128 m = default;
            paramQueue.TryDequeue(out m);
            paramQueue.context->glUniform1f(*(int*)m.UInt64[0], m.Single[2]);
        }

        private static unsafe void UniformVal1fv()
        {
            M128 m = default;
            paramQueue.TryDequeue(out m);
            paramQueue.context->glUniform1fv(*(int*)m.UInt64[0], 4, (Vec4d*)m.UInt64[0]);
        }

        private static void UniformVal1i()
        {
            M128 m = default;
            paramQueue.TryDequeue(out m);
            paramQueue.context->glUniform1i(*(int*)m.UInt64[0], m.Int32[2]);
        }

        private static void UniformVal2f()
        {
            M128 m = default;
            paramQueue.TryDequeue(out m);
            paramQueue.context->glUniform2f(*(int*)m.UInt64[0], m.Single[2], m.Single[3]);
        }

        private static void UniformVal3f()
        {
            IntPtr handle = IntPtr.Zero;
            M128 m = default;
            paramQueue.TryDequeue(out handle);
            paramQueue.TryDequeue(out m);
            paramQueue.context->glUniform3f(*(int*)handle, m.Single[0], m.Single[1], m.Single[2]);
        }
        private static void UniformVal4f()
        {
            IntPtr handle = IntPtr.Zero;
            M128 m = default;
            paramQueue.TryDequeue(out handle);
            paramQueue.TryDequeue(out m);
            paramQueue.context->glUniform4f(*(int*)handle, m.Single[0], m.Single[1], m.Single[2], m.Single[2]);
        }
    }
}