using System;

namespace ScreenConnect;

public abstract class DiskNativeLibrary : CriticalFinalizerDisposableObject, INativeLibrary
{
	private IntPtr libraryHandle;

	protected DiskNativeLibrary(string libraryPath)
	{
		libraryHandle = TryLoadNativeLibrary(libraryPath);
		if (libraryHandle == IntPtr.Zero)
		{
			throw new InvalidOperationException("Unable to load native library from '" + libraryPath + "'");
		}
	}

	public IntPtr TryGetProcedureAddress(string procedureName)
	{
		procedureName.AssertArgumentNonNull("procedureName");
		return TryGetProcedureAddress(libraryHandle, procedureName);
	}

	protected override void Dispose(bool disposing)
	{
		if (libraryHandle != IntPtr.Zero)
		{
			TryFreeNativeLibrary(libraryHandle);
		}
	}

	protected abstract IntPtr TryLoadNativeLibrary(string libraryPath);

	protected abstract void TryFreeNativeLibrary(IntPtr libraryHandle);

	protected abstract IntPtr TryGetProcedureAddress(IntPtr libraryHandle, string procedureName);
}