/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            aboutdialog.cc
 *
 *  Sat Oct  6 14:29:56 CEST 2018
 *  Copyright 2018 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo 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.
 *
 *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "aboutdialog.h"

#include "stdio.h"

#include <QLabel>
#include <QVBoxLayout>
#include <QFile>
#include <QTimer>
#include <QScrollBar>
#include <QScrollArea>

#include <version.h>

AboutDialog::AboutDialog(QWidget *parent, Qt::WindowFlags f)
	: QDialog(parent, f)
{
	setWindowTitle(tr("About DGEdit"));
	setFixedSize(590,500);

	// Read AUTHORS data from file
	QFile file(":AUTHORS");
	QByteArray authorsText;
	if(file.open(QIODevice::ReadOnly))
	{
		authorsText = file.readAll();
		file.close();
	}
	else
	{
		printf("ERROR: Couldn't find AUTHORS file at the designated location.\n");
		authorsText = "ERROR: File not found...";
	}

	// Read COPYING data from file
	file.setFileName(":COPYING");
	QByteArray gplText;
	if(file.open(QIODevice::ReadOnly))
	{
		gplText = file.readAll();
		file.close();
	}
	else
	{
		printf("ERROR: Couldn't find COPYING file at the designated location.\n");
		gplText = "ERROR: File not found...";
	}

	QVBoxLayout *layout = new QVBoxLayout();

	QHBoxLayout *topLayout = new QHBoxLayout();
	QLabel *logo = new QLabel();
	logo->setPixmap(QPixmap(":icons/logo.png"));
	QLabel *title = new QLabel;
	title->setWordWrap(true);
	title->setText(tr("<h1>DGEdit</h1>"
	                  "<h2>v." VERSION "</h2>"
	                  "Copyright (C) 2008-2018 Bent Bisballe Nyeng - Aasimon.org.<br/>"
	                  "This is free software. You may redistribute copies of it "
	                  "under the terms of the GNU General Public License "
	                  "(http://www.gnu.org/licenses/gpl.html). There is NO "
	                  "WARRANTY, to the extent permitted by law."));

	topLayout->addWidget(logo);
	topLayout->addWidget(title);
	topLayout->setStretch(1, 1);
	topLayout->setStretch(2, 2);

	QLabel *releaseInfo = new QLabel(authorsText);
	releaseInfo->setStyleSheet("QLabel { background-color : white; }");

	QScrollArea *releaseInfoScroll = new QScrollArea();
	releaseInfoScroll->setWidget(releaseInfo);
	releaseInfoScroll->setStyleSheet("QScrollArea { background-color : white; }");

	QLabel *license = new QLabel(gplText);
	license->setStyleSheet("QLabel { font-family: monospace; "
	                       "background-color : white; }");
	licenseScroll = new QScrollArea();
	licenseScroll->setStyleSheet("QScrollArea { background-color : white; }");
	licenseScroll->setWidget(license);

	connect(licenseScroll->verticalScrollBar(), SIGNAL(sliderPressed()),
	        this, SLOT(noMoreScroll()));
	tabs = new QTabWidget();
	connect(tabs, SIGNAL(currentChanged(int)), this, SLOT(checkTab(int)));
	tabs->addTab(releaseInfoScroll, "Release Info");
	tabs->addTab(licenseScroll, "License");

	layout->addLayout(topLayout);
	layout->addWidget(tabs);
	setLayout(layout);

	scrollState = 0; // 0 = initial state
	                 // 1 = initiate scroll
	                 // 2 = scroll 1 step
	                 // 3 = no more scroll

	scrollTimer = new QTimer();
	scrollTimer->setSingleShot(true);
	connect(scrollTimer, SIGNAL(timeout()), this, SLOT(scroll()));
}

void AboutDialog::mousePressEvent(QMouseEvent * event)
{
	if(event) // TODO: Perhaps do a mouse click check on the event
	{
		accept();
	}
}

void AboutDialog::scroll()
{
	switch(scrollState)
	{
	case 0 : // 0 = initial state
		scrollState = 1;
		scrollTimer->setInterval(5000);
		scrollTimer->start();
		break;
	case 1 : // 1 = initiate scroll
		scrollState = 2;
		licenseScroll->verticalScrollBar()->setValue(0);
		scrollTimer->setInterval(200);
		scrollTimer->start();
		break;
	case 2 : // 2 = scroll 1 step
		licenseScroll->verticalScrollBar()->
			setValue(licenseScroll->verticalScrollBar()->value() + 2);
		if(licenseScroll->verticalScrollBar()->value() >=
		   licenseScroll->verticalScrollBar()->maximum())
		{
			scrollState = 0;
		}
		scrollTimer->start();
		break;
	case 3 : // 3 = no more scroll
		scrollTimer->stop();
		break;
	}
}

void AboutDialog::noMoreScroll()
{
	scrollState = 3;
}

void AboutDialog::checkTab(int tabIndex)
{
	if(tabIndex == 1)
	{
		scrollState = 0;
		scrollTimer->stop();
		scroll();
	}
}