/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 *
 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2015 Thincast Technologies GmbH
 * Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <freerdp/config.h>

#include <freerdp/log.h>
#include "shadow.h"

#include "shadow_encomsp.h"

#define TAG SERVER_TAG("shadow")

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
WINPR_ATTR_NODISCARD
static UINT
encomsp_change_participant_control_level(EncomspServerContext* context,
                                         ENCOMSP_CHANGE_PARTICIPANT_CONTROL_LEVEL_PDU* pdu)
{
	BOOL inLobby = 0;
	BOOL mayView = 0;
	BOOL mayInteract = 0;
	rdpShadowClient* client = (rdpShadowClient*)context->custom;

	WLog_INFO(TAG,
	          "ChangeParticipantControlLevel: ParticipantId: %" PRIu32 " Flags: 0x%04" PRIX16 "",
	          pdu->ParticipantId, pdu->Flags);

	mayView = (pdu->Flags & ENCOMSP_MAY_VIEW) != 0;
	mayInteract = (pdu->Flags & ENCOMSP_MAY_INTERACT) != 0;

	if (mayInteract && !mayView)
		mayView = TRUE; /* may interact implies may view */

	if (mayInteract)
	{
		if (!client->mayInteract)
		{
			/* request interact + view */
			client->mayInteract = TRUE;
			client->mayView = TRUE;
		}
	}
	else if (mayView)
	{
		if (client->mayInteract)
		{
			/* release interact */
			client->mayInteract = FALSE;
		}
		else if (!client->mayView)
		{
			/* request view */
			client->mayView = TRUE;
		}
	}
	else
	{
		if (client->mayInteract)
		{
			/* release interact + view */
			client->mayView = FALSE;
			client->mayInteract = FALSE;
		}
		else if (client->mayView)
		{
			/* release view */
			client->mayView = FALSE;
			client->mayInteract = FALSE;
		}
	}

	inLobby = !(client->mayView);

	if (inLobby != client->inLobby)
	{
		if (shadow_encoder_reset(client->encoder) < 0)
			return ERROR_NOT_READY;
		client->inLobby = inLobby;
	}

	return CHANNEL_RC_OK;
}

int shadow_client_encomsp_init(rdpShadowClient* client)
{
	WINPR_ASSERT(client);

	EncomspServerContext* encomsp = client->encomsp = encomsp_server_context_new(client->vcm);
	if (!encomsp)
		return -1;

	encomsp->rdpcontext = &client->context;

	encomsp->custom = (void*)client;

	encomsp->ChangeParticipantControlLevel = encomsp_change_participant_control_level;

	if (client->encomsp)
	{
		const UINT rc = client->encomsp->Start(client->encomsp);
		if (rc != CHANNEL_RC_OK)
			return -1;
	}

	return 1;
}

void shadow_client_encomsp_uninit(rdpShadowClient* client)
{
	WINPR_ASSERT(client);
	if (client->encomsp)
	{
		client->encomsp->Stop(client->encomsp);
		encomsp_server_context_free(client->encomsp);
		client->encomsp = nullptr;
	}
}