/**

 * Relational pipes

 * Copyright © 2018 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * 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, version 3 of the License.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include <sys/prctl.h>

#include <stdio.h>

#include <unistd.h>

#include <iostream>

#include <QApplication>

#include <QThread>

#include <relpipe/cli/CLI.h>

#include <relpipe/cli/RelpipeCLIException.h>

#include <relpipe/reader/Factory.h>

#include <relpipe/reader/RelationalReader.h>

#include <relpipe/reader/RelpipeReaderException.h>

#include "RelpipeChartMainWindow.h"

#include "QtRelationalReaderStringHandler.h"

using namespace relpipe::cli;

using namespace relpipe::reader;

// signal/slot parameters must be declared here and registered with qRegisterMetaType()

Q_DECLARE_METATYPE(string_t)

Q_DECLARE_METATYPE(std::vector<AttributeMetadata>)

class RelationalReaderThread : public QThread {

private:

	std::shared_ptr<RelationalReader> reader;

public:

	// TODO: better background thread; lambda?

	RelationalReaderThread(std::shared_ptr<RelationalReader> reader) :

	reader(reader) {

		setTerminationEnabled(true);

	}

	void run() {

		try {

			reader->process();

		} catch (RelpipeReaderException& e) {

			// TODO: handle exception, show error dialog

			std::wcerr << L"RelpipeReaderException: " << e.getMessge() << std::endl;

		}

	}

};

int main(int argc, char**argv) {

	setlocale(LC_ALL, "");

	CLI::untieStdIO();

	CLI cli(argc, argv);

	// TODO: argument name collisions? Filter arguments? Use prefix for Qt? Qt: -title, -style, -geometry

	QApplication app(argc, argv);

	std::shared_ptr<RelationalReader> reader(Factory::create(std::cin));

	int resultCode = CLI::EXIT_CODE_UNEXPECTED_ERROR;

	RelpipeChartMainWindow window;

	window.show();

	RelationalReaderThread t(reader);

	// Proxy that passes calls from the background thread to the GUI thread using signal-slot mechanism:

	QtRelationalReaderStringHandler handler(&t); // &t instead of handler.moveToThread(&t); // QObject::moveToThread: Cannot move objects with a parent

	// see Q_DECLARE_METATYPE above

	qRegisterMetaType<string_t>();

	qRegisterMetaType<std::vector < AttributeMetadata >> ();

	QObject::connect(&handler, &QtRelationalReaderStringHandler::startRelationReceived, &window, &RelpipeChartMainWindow::startRelation, Qt::ConnectionType::QueuedConnection);

	QObject::connect(&handler, &QtRelationalReaderStringHandler::attributeReceived, &window, &RelpipeChartMainWindow::attribute, Qt::ConnectionType::QueuedConnection);

	QObject::connect(&handler, &QtRelationalReaderStringHandler::endOfPipeReceived, &window, &RelpipeChartMainWindow::endOfPipe, Qt::ConnectionType::QueuedConnection);

	reader->addHandler(&handler);

	// Start background thread

	t.start();

	int qtResultCode = app.exec();

	if (qtResultCode == 0) {

		resultCode = CLI::EXIT_CODE_SUCCESS;

	} else {

		// TODO: report and log Qt errors if any

	}

	if (t.isRunning()) {

		std::wcerr << L"Background RelationalReader thread is still running → terminate()" << std::endl;

		t.terminate();

		std::wcerr << L"Background RelationalReader thread was terminated → wait()" << std::endl;

		t.wait();

		std::wcerr << L"Background RelationalReader thread wait() finished" << std::endl;

	}

	return resultCode;

}