using StgSharp.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp
{
    internal enum GraphicAPI : byte
    {
        GL,
        DX,
        VK
    }

    public static class Platform
    {

        internal static GraphicAPI API;

        /// <summary>
        /// Version of current StgSharp platform.
        /// Main version represent in hundred's digit,
        /// and sub version represent in ten's digit.
        /// </summary>
        public const long version = 430;

        /// <summary>
        /// Init an instance of OpenGL program,
        /// This method should be called before other 
        /// graphic methods, after LoadGL method.
        /// </summary>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static void InitGL(int majorVersion, int minorVersion)
        {
            InternalIO.InternalInitGL(majorVersion, minorVersion);
        }

        /// <summary>
        /// Write a log message to log file, and mark the level of this message.
        /// </summary>
        /// <param name="message">A string contains information of how current evironment runs.</param>
        /// <param name="logType">The severity of current message.</param>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static void WriteLog(string message, LogType logType)
        {
            InternalIO.InternalWriteLog(message, logType);
        }

        internal static TDele ConvertAPI<TDele>(IntPtr funcPtr)
        {
            if (funcPtr == IntPtr.Zero)
            {
                throw new Exception("Failed to convert api, the function pointer is zero.");
            }
            try
            {
                return Marshal.GetDelegateForFunctionPointer<TDele>(funcPtr);

            }
            catch (Exception)
            {
                throw;
            }
        }

        internal static Delegate ConvertAPI(IntPtr funcPtr, Type T)
        {

            if (funcPtr == IntPtr.Zero)
            {
                throw new Exception("Failed to convert api, the function pointer is zero.");
            }
            try
            {
                return Marshal.GetDelegateForFunctionPointer(funcPtr, T);

            }
            catch (Exception)
            {
                throw;
            }
        }

    }
}