/*******************************************************************************************************
 DkMessageBox.cpp
 Created on:	28.03.2014
 
 nomacs is a fast and small image viewer with the capability of synchronizing multiple instances
 
 Copyright (C) 2011-2014 Markus Diem <markus@nomacs.org>
 Copyright (C) 2011-2014 Stefan Fiel <stefan@nomacs.org>
 Copyright (C) 2011-2014 Florian Kleber <florian@nomacs.org>

 This file is part of nomacs.

 nomacs 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 3 of the License, or
 (at your option) any later version.

 nomacs 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 "DkMessageBox.h"
#include "DkSettings.h"

#pragma warning(push, 0)	// no warnings from includes - begin
#include <QDialogButtonBox>
#include <QCheckBox>
#include <QSettings>
#include <QLabel>
#include <QStyle>
#include <QGridLayout>
#include <QDebug>
#include <QApplication>
#include <QDesktopWidget>
#include <QPushButton>
#pragma warning(pop)		// no warnings from includes - end

#ifdef QT_NO_DEBUG_OUTPUT
#pragma warning(disable: 4127)		// no 'conditional expression is constant' if qDebug() messages are removed
#endif

namespace nmc {

// DkMessageBox --------------------------------------------------------------------
DkMessageBox::DkMessageBox(QMessageBox::Icon icon, 
	const QString& title, 
	const QString& text, 
	QMessageBox::StandardButtons buttons /* = QMessageBox::NoButton */, 
	QWidget* parent /* = 0 */, 
	Qt::WindowFlags f /* = Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint */) : QDialog(parent, f) {

		createLayout(icon, text, buttons);
		setWindowTitle(title);

}

DkMessageBox::DkMessageBox(QWidget* parent /* = 0 */) : QDialog(parent) {

	createLayout(QMessageBox::NoIcon, "", QMessageBox::NoButton);
	setWindowTitle(tr("Error"));
}

DkMessageBox::~DkMessageBox() {
	
	// save settings
	DefaultSettings settings;
	settings.beginGroup("DkDialog");
	settings.setValue(objectName(), !showAgain->isChecked());
	settings.endGroup();
}

void DkMessageBox::createLayout(const QMessageBox::Icon& userIcon, const QString& userText, QMessageBox::StandardButtons buttons) {

	setAttribute(Qt::WA_DeleteOnClose, true);

	//schamlos von qmessagebox.cpp geklaut
	textLabel = new QLabel(userText);
	textLabel->setTextInteractionFlags(Qt::TextInteractionFlags(style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, 0, this)));

	textLabel->setAlignment(Qt::AlignVCenter | Qt::AlignLeft);
	textLabel->setOpenExternalLinks(true);
#if defined(Q_OS_MAC)
	textLabel->setContentsMargins(16, 0, 0, 0);
#else
	textLabel->setContentsMargins(2, 0, 0, 0);
	textLabel->setIndent(9);
#endif
	icon = userIcon;
	iconLabel = new QLabel;
	iconLabel->setPixmap(QMessageBox::standardIcon((QMessageBox::Icon)icon));
	iconLabel->setObjectName(QLatin1String("iconLabel"));
	iconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

	showAgain = new QCheckBox(tr("Remember my choice"));
	showAgain->setChecked(true);

	buttonBox = new QDialogButtonBox;
	buttonBox->setObjectName(QLatin1String("buttonBox"));
	buttonBox->setCenterButtons(style()->styleHint(QStyle::SH_MessageBox_CenterButtons, 0, this) != 0);
	QObject::connect(buttonBox, SIGNAL(clicked(QAbstractButton*)),
		this, SLOT(buttonClicked(QAbstractButton*)));

	buttonBox->setStandardButtons(QDialogButtonBox::StandardButtons(int(buttons)));
	
	QGridLayout *grid = new QGridLayout;
#ifndef Q_OS_MAC
	grid->addWidget(iconLabel, 0, 0, 2, 1, Qt::AlignTop);
	grid->addWidget(textLabel, 0, 1, 1, 1);
	grid->addWidget(showAgain, 2, 1, 1, 2);
	grid->addWidget(buttonBox, 3, 0, 1, 2);
#else
	grid->setMargin(0);
	grid->setVerticalSpacing(8);
	grid->setHorizontalSpacing(0);
	setContentsMargins(24, 15, 24, 20);
	grid->addWidget(iconLabel, 0, 0, 2, 1, Qt::AlignTop | Qt::AlignLeft);
	grid->addWidget(textLabel, 0, 1, 1, 1);
	// -- leave space for information label --
	grid->setRowStretch(1, 100);
	grid->setRowMinimumHeight(2, 6);
	grid->addWidget(buttonBox, 3, 1, 1, 1);
#endif

	//grid->setSizeConstraint(QLayout::SetNoConstraint);
	setLayout(grid);

	setModal(true);

#ifdef Q_OS_MAC
	QFont f = font();
	f.setBold(true);
	textLabel->setFont(f);
#endif

}

void DkMessageBox::setVisible(bool visible) {


	if (visible)
		adjustSize();

	QDialog::setVisible(visible);
}

int DkMessageBox::exec() {

	QString objName = objectName();

	DefaultSettings settings;
	settings.beginGroup("DkDialog");
	bool show = settings.value(objName, true).toBool();
	int answer = settings.value(objName + "-answer", QDialog::Accepted).toInt();
	settings.endGroup();
	showAgain->setChecked(!show);

	if (!show)
		return answer;

	answer = QDialog::exec();	// destroys dialog - be careful with what you do afterwards

	settings.beginGroup("DkDialog");
	if (answer != QMessageBox::NoButton && answer != QMessageBox::Cancel) {
		// save show again
		settings.setValue(objName + "-answer", answer);
	}
	else
		settings.setValue(objName, true);
	settings.endGroup();

	return answer;
}

void DkMessageBox::setDefaultButton(QMessageBox::StandardButton button) {
	
	QPushButton* b = buttonBox->button(QDialogButtonBox::StandardButton(button));

	if (!b)
		return;

	b->setDefault(true);
	b->setFocus();
}

void DkMessageBox::setButtonText(QMessageBox::StandardButton button, const QString &text) {
	
	if (QAbstractButton *abstractButton = buttonBox->button(QDialogButtonBox::StandardButton(button)))
		abstractButton->setText(text);
}


void DkMessageBox::buttonClicked(QAbstractButton* button) {

	int ret = buttonBox->standardButton(button);
	done(ret); // does not trigger closeEvent
}

void DkMessageBox::updateSize() {

	if (!isVisible())
		return;

	QSize screenSize = QApplication::desktop()->availableGeometry(QCursor::pos()).size();
#if defined(Q_OS_WINCE)
	// the width of the screen, less the window border.
	int hardLimit = screenSize.width() - (frameGeometry().width() - geometry().width());
#else
	int hardLimit = qMin(screenSize.width() - 480, 1000); // can never get bigger than this
	// on small screens allows the messagebox be the same size as the screen
	if (screenSize.width() <= 1024)
		hardLimit = screenSize.width();
#endif
#ifdef Q_OS_MAC
	int softLimit = qMin(screenSize.width()/2, 420);
#else
	// note: ideally on windows, hard and soft limits but it breaks compat
#ifndef Q_OS_WINCE
	int softLimit = qMin(screenSize.width()/2, 500);
#else
	int softLimit = qMin(screenSize.width() * 3 / 4, 500);
#endif //Q_OS_WINCE
#endif

	textLabel->setWordWrap(false); // makes the label return min size
	int width = minimumWidth();

	if (width > softLimit) {
		textLabel->setWordWrap(true);
		width = qMax(softLimit, minimumWidth());

		if (width > hardLimit)
			width = hardLimit;
	}

	QFontMetrics fm(QApplication::font("QMdiSubWindowTitleBar"));
	int windowTitleWidth = qMin(fm.width(windowTitle()) + 50, hardLimit);
	if (windowTitleWidth > width)
		width = windowTitleWidth;

	this->setFixedSize(width, minimumHeight());
	QCoreApplication::removePostedEvents(this, QEvent::LayoutRequest);

}

}