using System;

namespace ScreenConnect;

public class ZStandardDecoder : ZStandardCoder<Native.libzstd.ZSTD_dParameter>
{
	public static int MaximumReasonableWindowLog => 30;

	public override bool AreInputOutputCursorsAlwaysSynced => true;

	protected override (Native.libzstd.ZSTD_dParameter, int)[] GetParameterValues()
	{
		return new(Native.libzstd.ZSTD_dParameter, int)[1] { (Native.libzstd.ZSTD_dParameter.ZSTD_d_windowLogMax, MaximumReasonableWindowLog) };
	}

	protected override IntPtr CreateStream()
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_createDStream();
	}

	protected override IntPtr InitializeStream(IntPtr stream)
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_initDStream(stream);
	}

	protected override IntPtr FreeStream(IntPtr stream)
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_freeDStream(stream);
	}

	protected override IntPtr SetParameterValue(IntPtr stream, Native.libzstd.ZSTD_dParameter parameter, int value)
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_DCtx_setParameter(stream, parameter, value);
	}

	protected override IntPtr GetInputSize()
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_DStreamInSize();
	}

	protected override IntPtr GetOutputSize()
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_DStreamOutSize();
	}

	protected override IntPtr Process(IntPtr stream, ref Native.libzstd.ZSTD_Buffer input, ref Native.libzstd.ZSTD_Buffer output, CoderFlushType flushType)
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_decompressStream(stream, ref output, ref input);
	}

	public override IntPtr GetCurrentSize(IntPtr stream)
	{
		return NativeLibrarySingleton<Native.libzstd, Toolkit>.Instance.ZSTD_sizeof_DCtx(stream);
	}
}