using System;
using System.IO;
using System.Runtime.InteropServices;

namespace VideoReader;

public class InteropHelper
{
	public const string LD_LIBRARY_PATH = "LD_LIBRARY_PATH";

	public static void RegisterLibrariesSearchPath(string path)
	{
		switch (Environment.OSVersion.Platform)
		{
		case PlatformID.Win32S:
		case PlatformID.Win32Windows:
		case PlatformID.Win32NT:
			SetDllDirectory(path);
			break;
		case PlatformID.Unix:
		case PlatformID.MacOSX:
		{
			string environmentVariable = Environment.GetEnvironmentVariable("LD_LIBRARY_PATH");
			if (!string.IsNullOrWhiteSpace(environmentVariable) && !environmentVariable.Contains(path))
			{
				char pathSeparator = Path.PathSeparator;
				string value = environmentVariable + pathSeparator + path;
				Environment.SetEnvironmentVariable("LD_LIBRARY_PATH", value);
			}
			break;
		}
		case PlatformID.WinCE:
		case PlatformID.Xbox:
			break;
		}
	}

	[DllImport("kernel32", SetLastError = true)]
	private static extern bool SetDllDirectory(string lpPathName);
}