/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012 Synergy Si Ltd.
 * Copyright (C) 2012 Nick Bolton
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 *
 * This package 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, see <http://www.gnu.org/licenses/>.
 */

#include "IpcClient.h"
#include <QTcpSocket>
#include <QHostAddress>
#include <iostream>
#include <QTimer>
#include "IpcReader.h"
#include "Ipc.h"
#include <QDataStream>

IpcClient::IpcClient() :
m_ReaderStarted(false),
m_Enabled(false)
{
	m_Socket = new QTcpSocket(this);
	connect(m_Socket, SIGNAL(connected()), this, SLOT(connected()));
	connect(m_Socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(error(QAbstractSocket::SocketError)));

	m_Reader = new IpcReader(m_Socket);
	connect(m_Reader, SIGNAL(readLogLine(const QString&)), this, SLOT(handleReadLogLine(const QString&)));
}

IpcClient::~IpcClient()
{
}

void IpcClient::connected()
{
	sendHello();
	infoMessage("connection established");
}

void IpcClient::connectToHost()
{
	m_Enabled = true;

	infoMessage("connecting to service...");
	m_Socket->connectToHost(QHostAddress(QHostAddress::LocalHost), IPC_PORT);

	if (!m_ReaderStarted) {
		m_Reader->start();
		m_ReaderStarted = true;
	}
}

void IpcClient::disconnectFromHost()
{
	infoMessage("service disconnect");
	m_Reader->stop();
	m_Socket->close();
}

void IpcClient::error(QAbstractSocket::SocketError error)
{
	QString text;
	switch (error) {
		case 0: text = "connection refused"; break;
		case 1: text = "remote host closed"; break;
		default: text = QString("code=%1").arg(error); break;
	}

	errorMessage(QString("ipc connection error, %1").arg(text));

	QTimer::singleShot(1000, this, SLOT(retryConnect()));
}

void IpcClient::retryConnect()
{
	if (m_Enabled) {
		connectToHost();
	}
}

void IpcClient::sendHello()
{
	QDataStream stream(m_Socket);
	stream.writeRawData(kIpcMsgHello, 4);

	char typeBuf[1];
	typeBuf[0] = kIpcClientGui;
	stream.writeRawData(typeBuf, 1);
}

void IpcClient::sendCommand(const QString& command, bool elevate)
{
	QDataStream stream(m_Socket);

	stream.writeRawData(kIpcMsgCommand, 4);

	std::string stdStringCommand = command.toStdString();
	const char* charCommand = stdStringCommand.c_str();
	int length = strlen(charCommand);

	char lenBuf[4];
	intToBytes(length, lenBuf, 4);
	stream.writeRawData(lenBuf, 4);
	stream.writeRawData(charCommand, length);

	char elevateBuf[1];
	elevateBuf[0] = elevate ? 1 : 0;
	stream.writeRawData(elevateBuf, 1);
}

void IpcClient::handleReadLogLine(const QString& text)
{
	readLogLine(text);
}

// TODO: qt must have a built in way of converting int to bytes.
void IpcClient::intToBytes(int value, char *buffer, int size)
{
	if (size == 1) {
		buffer[0] = value & 0xff;
	}
	else if (size == 2) {
		buffer[0] = (value >> 8) & 0xff;
		buffer[1] = value & 0xff;
	}
	else if (size == 4) {
		buffer[0] = (value >> 24) & 0xff;
		buffer[1] = (value >> 16) & 0xff;
		buffer[2] = (value >> 8) & 0xff;
		buffer[3] = value & 0xff;
	}
	else {
		// TODO: other sizes, if needed.
	}
}
