#include <QCoreApplication>
#include <QCommandLineParser>
#include <QIODevice>
#include <QTcpSocket>
#include <iostream>
#include <QJsonObject>
#include <QJsonDocument>
#include <QStandardPaths>
#include <QFile>
#include <QTimer>
#include <signal.h>

#include "microcontroller.h"
#include "nfcuid.h"
#include "overlorditemstore.h"
#include "train.h"
#include "turnout.h"
#include "layout.h"

void sigHandler(int sig)
{
	QCoreApplication::quit();
}

QJsonObject getJsonObjectFromDisk(const QString& filePath, bool* error)
{
	QFile file;

	if(filePath.size() > 0)
		file.setFileName(filePath);
	else
		file.setFileName(QStandardPaths::writableLocation(QStandardPaths::ConfigLocation) + "/trainoverloard.json");

	file.open(QIODevice::ReadOnly);
	if(!file.isOpen())
	{
		std::cerr<<"Can not open config file: "<<filePath.toLatin1().data()<<std::endl;
	}
	else
	{
		QJsonParseError qerror;
		QJsonDocument document(QJsonDocument::fromJson(file.readAll(), &qerror));
		file.close();
		if(qerror.error != QJsonParseError::NoError)
		{
			qDebug()<<filePath<<" "<<qerror.errorString();
			if(error)
				(*error) = true;
		}
		return document.object();
	}
	return QJsonObject();
}

bool storeJsonObjectToDisk(const QJsonObject& json, QString filePath = QString())
{
	if(filePath.size() == 0)
	{
		filePath = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation) + "/trainoverloard.json";
	}
	QFile file(filePath + ".out");

	qDebug()<<"config file: "<<filePath;
	file.open(QIODevice::WriteOnly);
	if(!file.isOpen())
	{
	   std::cerr<<"Can not open config file: "<<filePath.toLatin1().data()<<std::endl;
	   return false;
	}
	else
	{
		QJsonDocument document(json);
		file.write(document.toJson());
		file.close();
		QFile::remove(filePath);
		file.rename(filePath);
		return true;
	}
}

void getItemsCb(QTimer* timer, ItemStore* items, Microcontroller* micro)
{
	if(items->getItems()->empty())
	{
		micro->requestState();
		timer->start(1000);
	}
}

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);

	signal(SIGINT, &sigHandler);

	//set info
	QCoreApplication::setOrganizationName("UVOS");
	QCoreApplication::setOrganizationDomain("uvos.xyz");
	QCoreApplication::setApplicationName("TrainOverlord");
	QCoreApplication::setApplicationVersion("0.1");

	//parse comand line
	QCommandLineParser parser;
	parser.setApplicationDescription("Train control application");
	parser.addHelpOption();
	parser.addVersionOption();
	QCommandLineOption hostOption(QStringList() << "H" << "host", QCoreApplication::translate("main",
								  "Set server host ip addres"), "adress");
	parser.addOption(hostOption);
	QCommandLineOption portOption(QStringList() << "p" << "port", QCoreApplication::translate("main",
								  "Set server Port in TCP mode or Serial port in serial mode"), "port");
	parser.addOption(portOption);
	parser.process(a);

	QTcpSocket microSocket;

	int port = 6856;
	if(parser.isSet(portOption))
		port =  parser.value(portOption).toInt();

	QString host("127.0.0.1");
	if(parser.isSet(hostOption)) host = parser.value(hostOption);
	std::cout<<"connecting to "<<host.toStdString()<<':'<<port<<'\n';
	microSocket.connectToHost(host, port, QIODevice::ReadWrite);
	if(!microSocket.waitForConnected(3000))
	{
		std::cout<<"Can not connect to to Server.\n";
		return 1;
	}

	OverlordItemStore items;
	Layout layout(&items);

	Microcontroller micro(&microSocket);
	QObject::connect(&micro, &Microcontroller::gotTag, &layout, &Layout::tagArrivedAtReader);
	QObject::connect(&micro, &Microcontroller::gotItemList, &items, &OverlordItemStore::addItems);
	QObject::connect(&micro, &Microcontroller::itemChanged, &items, &OverlordItemStore::itemStateChanged);
	
	Train::micro = &micro;
	Turnout::micro = &micro;
	Signal::micro = &micro;

	QTimer timer;
	timer.setSingleShot(false);
	QObject::connect(&timer, &QTimer::timeout, &timer, [&micro, &timer, &items](){getItemsCb(&timer, &items, &micro);});
	getItemsCb(&timer, &items, &micro);

	{
		bool err = false;
		QJsonObject json = getJsonObjectFromDisk(QString(), &err);
		if(err)
		{
			std::cerr<<"Could not load config file\n";
			return -1;
		}
		layout.load(json);
	}

	int ret = a.exec();
	/*
	QJsonObject jsonStore;
	layout.store(jsonStore);
	storeJsonObjectToDisk(jsonStore);
	*/
	return ret;
}