using System;
using System.Runtime.InteropServices;

namespace Viveport.Internal
{
	internal class Api
	{
		static Api()
		{
			LoadLibraryManually("viveport_api");
		}

		[DllImport("viveport_api", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_GetLicense")]
		internal static extern void GetLicense(GetLicenseCallback callback, string appId, string appKey);

		[DllImport("viveport_api64", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_GetLicense")]
		internal static extern void GetLicense_64(GetLicenseCallback callback, string appId, string appKey);

		[DllImport("viveport_api", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_Init")]
		internal static extern int Init(StatusCallback initCallback, string appId);

		[DllImport("viveport_api64", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_Init")]
		internal static extern int Init_64(StatusCallback initCallback, string appId);

		[DllImport("viveport_api", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_Shutdown")]
		internal static extern int Shutdown(StatusCallback initCallback);

		[DllImport("viveport_api64", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_Shutdown")]
		internal static extern int Shutdown_64(StatusCallback initCallback);

		[DllImport("viveport_api", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_Version")]
		internal static extern IntPtr Version();

		[DllImport("viveport_api64", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_Version")]
		internal static extern IntPtr Version_64();

		[DllImport("viveport_api", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_QueryRuntimeMode")]
		internal static extern void QueryRuntimeMode(QueryRuntimeModeCallback queryRunTimeCallback);

		[DllImport("viveport_api64", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, EntryPoint = "IViveportAPI_QueryRuntimeMode")]
		internal static extern void QueryRuntimeMode_64(QueryRuntimeModeCallback queryRunTimeCallback);

		[DllImport("kernel32.dll")]
		internal static extern IntPtr LoadLibrary(string dllToLoad);

		internal static void LoadLibraryManually(string dllName)
		{
			if (!string.IsNullOrEmpty(dllName))
			{
				if (IntPtr.Size == 8)
				{
					LoadLibrary("x64/" + dllName + "64.dll");
				}
				else
				{
					LoadLibrary("x86/" + dllName + ".dll");
				}
			}
		}
	}
}