/*
 *   Copyright (C) 2009-2014,2016,2017,2018 by Jonathan Naylor G4KLX
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "YSFDefines.h"
#include "FCSNetwork.h"
#include "Utils.h"
#include "Log.h"

#include <cstdio>
#include <cassert>
#include <cstring>

const char* FCS_VERSION = "MMDVM v.01";

const unsigned int BUFFER_LENGTH = 200U;

CFCSNetwork::CFCSNetwork(unsigned int port, const std::string& callsign, unsigned int rxFrequency, unsigned int txFrequency, const std::string& locator, unsigned int id, bool debug) :
m_socket(port),
m_debug(debug),
m_address(),
m_port(0U),
m_info(NULL),
m_callsign(callsign),
m_reflector(),
m_buffer(1000U, "FCS Network Buffer")
{
	m_info = new unsigned char[100U];
	::memset(m_info, ' ', 100U);

	m_callsign.resize(6U, ' ');

	::sprintf((char*)m_info, "%9u%9u%-6.6s%-12.12s%7u", rxFrequency, txFrequency, locator.c_str(), FCS_VERSION, id);
}

CFCSNetwork::~CFCSNetwork()
{
	delete[] m_info;
}

bool CFCSNetwork::open()
{
	m_addresses["FCS001"] = CUDPSocket::lookup("fcs001.xreflector.net");
	m_addresses["FCS002"] = CUDPSocket::lookup("fcs002.xreflector.net");
	m_addresses["FCS003"] = CUDPSocket::lookup("fcs003.xreflector.net");
	m_addresses["FCS004"] = CUDPSocket::lookup("fcs004.xreflector.net");

	LogMessage("Opening FCS network connection");

	return m_socket.open();
}

void CFCSNetwork::clearDestination()
{
	m_address.s_addr = INADDR_NONE;
	m_port           = 0U;
}

bool CFCSNetwork::write(const unsigned char* data)
{
	assert(data != NULL);

	if (m_port == 0U)
		return true;

	unsigned char buffer[130U];
	::memset(buffer + 0U, ' ', 130U);
	::memcpy(buffer + 0U, data + 35U, 120U);
	::memcpy(buffer + 121U, m_reflector.c_str(), 8U);

	if (m_debug)
		CUtils::dump(1U, "FCS Network Data Sent", buffer, 130U);

	return m_socket.write(buffer, 130U, m_address, m_port);
}

bool CFCSNetwork::writeLink(const std::string& reflector)
{
	m_port = 0U;

	if (m_addresses.count(reflector) == 0U)
		return false;

	m_address = m_addresses[reflector];

	if (m_address.s_addr == INADDR_NONE)
		return false;

	m_port = FCS_PORT;

	m_reflector = reflector;
	m_reflector.resize(8U, ' ');

	unsigned char buffer[25U];
	::memset(buffer + 0U, ' ', 25U);
	::memcpy(buffer + 0U, "PING", 4U);
	::memcpy(buffer + 4U, m_callsign.c_str(), 6U);
	::memcpy(buffer + 10U, m_reflector.c_str(), 6U);

	if (m_debug)
		CUtils::dump(1U, "FCS Network Data Sent", buffer, 25U);

	return m_socket.write(buffer, 25U, m_address, m_port);
}

bool CFCSNetwork::writeUnlink()
{
	if (m_port == 0U)
		return true;

	return m_socket.write((unsigned char*)"CLOSE      ", 11U, m_address, m_port);
}

void CFCSNetwork::clock(unsigned int ms)
{
	if (m_port == 0U)
		return;

	unsigned char buffer[BUFFER_LENGTH];

	in_addr address;
	unsigned int port;
	int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
	if (length <= 0)
		return;

	if (address.s_addr != m_address.s_addr || port != m_port)
		return;

	if (m_debug)
		CUtils::dump(1U, "FCS Network Data Received", buffer, length);

	if (length == 7 || length == 10)
		writeInfo();

	if (length == 130)
		m_buffer.addData(buffer, 130U);
}

unsigned int CFCSNetwork::read(unsigned char* data)
{
	assert(data != NULL);

	if (m_buffer.isEmpty())
		return 0U;

	m_buffer.getData(data, 130U);

	return 155U;
}

void CFCSNetwork::close()
{
	m_socket.close();

	LogMessage("Closing FCS network connection");
}

void CFCSNetwork::writeInfo()
{
	if (m_port == 0U)
		return;

	if (m_debug)
		CUtils::dump(1U, "FCS Network Data Sent", m_info, 100U);

	m_socket.write(m_info, 100U, m_address, m_port);
}