/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * FreeRDP X11 Server Interface
 *
 * Copyright 2013 Marc-Andre Moreau <marcandre.moreau@gmail.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 <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <sys/select.h>
#include <sys/signal.h>

#include "xf_peer.h"
#include "xfreerdp.h"

#include "xf_interface.h"

void* xf_server_thread(void* param)
{
	int i;
	int fds;
	int max_fds;
	int rcount;
	void* rfds[32];
	fd_set rfds_set;
	xfServer* server;
	freerdp_listener* listener;

	server = (xfServer*) param;
	listener = server->listener;

	while (1)
	{
		rcount = 0;

		ZeroMemory(rfds, sizeof(rfds));
		if (listener->GetFileDescriptor(listener, rfds, &rcount) != TRUE)
		{
			DEBUG_WARN( "Failed to get FreeRDP file descriptor\n");
			break;
		}

		max_fds = 0;
		FD_ZERO(&rfds_set);

		for (i = 0; i < rcount; i++)
		{
			fds = (int)(long)(rfds[i]);

			if (fds > max_fds)
				max_fds = fds;

			FD_SET(fds, &rfds_set);
		}

		if (max_fds == 0)
			break;

		if (select(max_fds + 1, &rfds_set, NULL, NULL, NULL) == -1)
		{
			/* these are not really errors */
			if (!((errno == EAGAIN) ||
				(errno == EWOULDBLOCK) ||
				(errno == EINPROGRESS) ||
				(errno == EINTR))) /* signal occurred */
			{
				DEBUG_WARN( "select failed\n");
				break;
			}
		}

		if (listener->CheckFileDescriptor(listener) != TRUE)
		{
			DEBUG_WARN( "Failed to check FreeRDP file descriptor\n");
			break;
		}
	}

	ExitThread(0);

	return NULL;
}

int freerdp_server_global_init()
{
	/*
	 * ignore SIGPIPE, otherwise an SSL_write failure could crash the server
	 */
	signal(SIGPIPE, SIG_IGN);

	return 0;
}

int freerdp_server_global_uninit()
{
	return 0;
}

int freerdp_server_start(xfServer* server)
{
	assert(NULL != server);
	
	server->thread = NULL;
	if (server->listener->Open(server->listener, NULL, 3389))
	{
		server->thread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)
				xf_server_thread, (void*) server, 0, NULL);
	}

	return 0;
}

int freerdp_server_stop(xfServer* server)
{
	if (server->thread)
	{
		/* ATTENTION: Terminate thread kills a thread, assure
		 * no resources are allocated during thread execution,
		 * as they will not be freed! */
		TerminateThread(server->thread, 0);
		WaitForSingleObject(server->thread, INFINITE);
		CloseHandle(server->thread);
	
		server->listener->Close(server->listener);
	}
	return 0;
}

HANDLE freerdp_server_get_thread(xfServer* server)
{
	return server->thread;
}

xfServer* freerdp_server_new(int argc, char** argv)
{
	xfServer* server;

	server = (xfServer*) malloc(sizeof(xfServer));

	if (server)
	{
		server->listener = freerdp_listener_new();
		server->listener->PeerAccepted = xf_peer_accepted;
	}

	return server;
}

void freerdp_server_free(xfServer* server)
{
	if (server)
	{
		freerdp_listener_free(server->listener);
		free(server);
	}
}