using StgSharp.Graphics;
using StgSharp.Math;
using System;
using System.Diagnostics;
using System.Numerics;
using System.Runtime.InteropServices;

namespace StgSharp
{

    internal static class Program
    {

        internal unsafe static void Main(string[] args)
        {

            Graphic.InitGL(3, 3);

            Form f = Graphic.GLcreateWindow(
                800, 600, "Test STG#!", IntPtr.Zero, null
                );
            Graphic.GLmakeContexCurrent(f);
            internalIO.glfwSetFramebufferSizeCallback(f.windowID, FormSizeCallback);

            GetApiRep();
            Graphic.InitGLAD(Graphic.GetProcAddress);

            while (internalIO.glfwWindowShouldClose(f.windowID) == 0)
            {
                ProcessInput(f.windowID);

                Graphic.glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
                Graphic.glClear(GLFW.GL_COLOR_BUFFER_BIT);

                internalIO.glfwSwapBuffers(f.windowID);
                internalIO.glfwPollEvents();
            }

            internalIO.glfwTerminate();

        }

        public static void FormSizeCallback(IntPtr window, int width, int height)
        {
            Graphic.glViewport(0, 0, width, height);
        }

        public static void ProcessInput(IntPtr windowPtr)
        {
            if (internalIO.glfwGetKey(windowPtr, (int)Control.Key.ESCAPE)
                == KeyStatus.PRESS)
            {
                internalIO.glfwSetWindowShouldClose(windowPtr, 1);
            }
        }

        [DllImport(internalIO.SSGC_libname, EntryPoint = "getApiReporter",
            CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
        internal extern static void internal_getApiReporter(IntPtr reporter);

        internal static void GetApiRep()
        {
            showApiHandler handle = new showApiHandler(ShowApiAddress);
            internal_getApiReporter(Marshal.GetFunctionPointerForDelegate(handle));
        }
        internal delegate void showApiHandler(ulong add);
        internal static void ShowApiAddress(ulong address)
        {
            Console.WriteLine(address);
        }

    }
}