// vim: set tabstop=4 shiftwidth=4 noexpandtab:
/*
Gwenview: an image viewer
Copyright 2007 Aurélien Gâteau <aurelien.gateau@free.fr>

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; either version 2
of the License, or (at your option) any later version.

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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

*/
// Self
#include "savebar.moc"

// Qt
#include <QHBoxLayout>
#include <QLabel>
#include <QToolButton>
#include <QToolTip>

// KDE
#include <kactioncollection.h>
#include <kcolorscheme.h>
#include <kdebug.h>
#include <kicon.h>
#include <kiconloader.h>
#include <klocale.h>
#include <kurl.h>

// Local
#include "lib/document/documentfactory.h"
#include "lib/gwenviewconfig.h"
#include "lib/memoryutils.h"
#include "lib/paintutils.h"

namespace Gwenview {


QToolButton* createToolButton() {
	QToolButton* button = new QToolButton;
	button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
	button->hide();
	return button;
}


struct SaveBarPrivate {
	SaveBar* that;
	KActionCollection* mActionCollection;
	QWidget* mSaveBarWidget;
	QWidget* mTopRowWidget;
	QToolButton* mUndoButton;
	QToolButton* mRedoButton;
	QToolButton* mSaveCurrentUrlButton;
	QToolButton* mSaveAllButton;
	QToolButton* mSaveAllFullScreenButton;
	QLabel* mMessageLabel;
	QLabel* mActionsLabel;
	QFrame* mTooManyChangesFrame;
	KUrl mCurrentUrl;
	bool mFullScreenMode;

	void createTooManyChangesFrame() {
		mTooManyChangesFrame = new QFrame;

		// Icon
		QLabel* iconLabel = new QLabel;
		QPixmap pix = KIconLoader::global()->loadIcon(
			"dialog-warning", KIconLoader::Dialog, KIconLoader::SizeSmall);
		iconLabel->setPixmap(pix);

		// Text label
		QLabel* textLabel = new QLabel;
		textLabel->setText(
			i18n("You have modified many images. To avoid memory problems, you should save your changes.")
			);

		mSaveAllFullScreenButton = createToolButton();

		// Layout
		QHBoxLayout* layout = new QHBoxLayout(mTooManyChangesFrame);
		layout->setMargin(0);
		layout->addWidget(iconLabel);
		layout->addWidget(textLabel);
		layout->addWidget(mSaveAllFullScreenButton);
		mTooManyChangesFrame->hide();

		// CSS
		KColorScheme scheme(mSaveBarWidget->palette().currentColorGroup(), KColorScheme::Window);
		QColor warningBackgroundColor = scheme.background(KColorScheme::NegativeBackground).color();
		QColor warningBorderColor = PaintUtils::adjustedHsv(warningBackgroundColor, 0, 150, 0);
		QColor warningColor = scheme.foreground(KColorScheme::NegativeText).color();

		QString css =
			".QFrame {"
			"	background-color: %1;"
			"	border: 1px solid %2;"
			"	border-radius: 4px;"
			"	padding: 3px;"
			"}"
			".QFrame QLabel {"
			"	color: %3;"
			"}"
			;
		css = css
			.arg(warningBackgroundColor.name())
			.arg(warningBorderColor.name())
			.arg(warningColor.name())
			;
		mTooManyChangesFrame->setStyleSheet(css);
	}

	void applyNormalStyleSheet() {
		QColor color = QToolTip::palette().base().color();
		QColor borderColor = PaintUtils::adjustedHsv(color, 0, 150, 0);

		QString css =
			".QWidget {"
			"	background-color: %1;"
			"	border-top: 1px solid %2;"
			"	border-bottom: 1px solid %2;"
			"}"
			;

		css = css
			.arg(color.name())
			.arg(borderColor.name())
			;
		mSaveBarWidget->setStyleSheet(css);
	}

	void applyFullScreenStyleSheet() {
		QString css =
			".QWidget {"
			"	background-color: #333;"
			"}";
		mSaveBarWidget->setStyleSheet(css);
	}


	void updateTooManyChangesFrame(const QList<KUrl>& list) {
		qreal maxPercentageOfMemoryUsage = GwenviewConfig::percentageOfMemoryUsageWarning();
		int maxMemoryUsage = MemoryUtils::getTotalMemory() * maxPercentageOfMemoryUsage;
		int memoryUsage = 0;
		Q_FOREACH(const KUrl& url, list) {
			Document::Ptr doc = DocumentFactory::instance()->load(url);
			memoryUsage += doc->memoryUsage();
		}

		mTooManyChangesFrame->setVisible(memoryUsage > maxMemoryUsage);
	}


	void updateTopRowWidget(const QList<KUrl>& lst) {
		QStringList links;
		QString message;

		if (lst.contains(mCurrentUrl)) {
			message = i18n("Current image modified");

			mUndoButton->show();
			mRedoButton->show();

			if (lst.size() > 1) {
				QString previous = i18n("Previous modified image");
				QString next = i18n("Next modified image");
				if (mCurrentUrl == lst[0]) {
					links << previous;
				} else {
					links << QString("<a href='previous'>%1</a>").arg(previous);
				}
				if (mCurrentUrl == lst[lst.size() - 1]) {
					links << next;
				} else {
					links << QString("<a href='next'>%1</a>").arg(next);
				}
			}
		} else {
			mUndoButton->hide();
			mRedoButton->hide();

			message = i18np("One image modified", "%1 images modified", lst.size());
			if (lst.size() > 1) {
				links << QString("<a href='first'>%1</a>").arg(i18n("Go to first modified image"));
			} else {
				links << QString("<a href='first'>%1</a>").arg(i18n("Go to it"));
			}
		}

		mSaveCurrentUrlButton->setVisible(lst.contains(mCurrentUrl));
		mSaveAllButton->setVisible(lst.size() >= 1);

		mMessageLabel->setText(message);
		mActionsLabel->setText(links.join(" | "));
	}


	void updateWidgetSizes() {
		QVBoxLayout* layout = static_cast<QVBoxLayout*>(mSaveBarWidget->layout());
		int topRowHeight = mFullScreenMode ? 0 : mTopRowWidget->height();
		int bottomRowHeight = mTooManyChangesFrame->isVisibleTo(mSaveBarWidget) ? mTooManyChangesFrame->sizeHint().height() : 0;

		int height = 2 * layout->margin() + topRowHeight + bottomRowHeight;
		if (topRowHeight > 0 && bottomRowHeight > 0) {
			height += layout->spacing();
		}
		mSaveBarWidget->setFixedHeight(height);
		that->setFixedHeight(height);
	}
};


SaveBar::SaveBar(QWidget* parent, KActionCollection* actionCollection)
: SlideContainer(parent)
, d(new SaveBarPrivate) {
	d->that = this;
	d->mFullScreenMode = false;
	d->mActionCollection = actionCollection;
	d->mSaveBarWidget = new QWidget();
	d->applyNormalStyleSheet();

	d->mMessageLabel = new QLabel;
	d->mMessageLabel->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);

	d->mUndoButton = createToolButton();
	d->mRedoButton = createToolButton();
	d->mSaveCurrentUrlButton = createToolButton();
	d->mSaveAllButton = createToolButton();

	d->mActionsLabel = new QLabel;
	d->mActionsLabel->setAlignment(Qt::AlignCenter);
	d->mActionsLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

	d->createTooManyChangesFrame();

	// Setup top row
	d->mTopRowWidget = new QWidget;
	QHBoxLayout* rowLayout = new QHBoxLayout(d->mTopRowWidget);
	rowLayout->addWidget(d->mMessageLabel);
	rowLayout->addWidget(d->mUndoButton);
	rowLayout->addWidget(d->mRedoButton);
	rowLayout->addWidget(d->mActionsLabel);
	rowLayout->addWidget(d->mSaveCurrentUrlButton);
	rowLayout->addWidget(d->mSaveAllButton);
	rowLayout->setMargin(0);

	// Setup bottom row
	QHBoxLayout* bottomRowLayout = new QHBoxLayout;
	bottomRowLayout->addStretch();
	bottomRowLayout->addWidget(d->mTooManyChangesFrame);
	bottomRowLayout->addStretch();

	// Gather everything together
	QVBoxLayout* layout = new QVBoxLayout(d->mSaveBarWidget);
	layout->addWidget(d->mTopRowWidget);
	layout->addLayout(bottomRowLayout);
	layout->setMargin(3);
	layout->setSpacing(3);

	hide();

	setContent(d->mSaveBarWidget);

	connect(DocumentFactory::instance(), SIGNAL(modifiedDocumentListChanged()),
		SLOT(updateContent()) );

	connect(d->mActionsLabel, SIGNAL(linkActivated(const QString&)),
		SLOT(triggerAction(const QString&)) );
}


SaveBar::~SaveBar() {
	delete d;
}


void SaveBar::initActionDependentWidgets() {
	d->mUndoButton->setDefaultAction(d->mActionCollection->action("edit_undo"));
	d->mRedoButton->setDefaultAction(d->mActionCollection->action("edit_redo"));
	d->mSaveCurrentUrlButton->setDefaultAction(d->mActionCollection->action("file_save"));

	// FIXME: Not using an action for now
	d->mSaveAllButton->setText(i18n("Save All"));
	d->mSaveAllButton->setIcon(KIcon("document-save-all"));
	connect(d->mSaveAllButton, SIGNAL(clicked()),
		SIGNAL(requestSaveAll()) );

	d->mSaveAllFullScreenButton->setText(i18n("Save All"));
	connect(d->mSaveAllFullScreenButton, SIGNAL(clicked()),
		SIGNAL(requestSaveAll()) );

	int height = d->mUndoButton->sizeHint().height();
	d->mTopRowWidget->setFixedHeight(height);
	d->updateWidgetSizes();
}


void SaveBar::setFullScreenMode(bool value) {
	d->mFullScreenMode = value;
	d->mSaveAllFullScreenButton->setVisible(value);
	if (value) {
		d->applyFullScreenStyleSheet();
	} else {
		d->applyNormalStyleSheet();
	}
	updateContent();
}


void SaveBar::updateContent() {
	QList<KUrl> lst = DocumentFactory::instance()->modifiedDocumentList();
	if (lst.size() == 0) {
		slideOut();
		return;
	}

	if (d->mFullScreenMode) {
		d->mTopRowWidget->hide();
	} else {
		d->mTopRowWidget->show();
		d->updateTopRowWidget(lst);
	}

	d->updateTooManyChangesFrame(lst);

	d->updateWidgetSizes();
	if (d->mFullScreenMode && !d->mTooManyChangesFrame->isVisibleTo(d->mSaveBarWidget)) {
		slideOut();
	} else {
		slideIn();
	}
}


void SaveBar::triggerAction(const QString& action) {
	QList<KUrl> lst = DocumentFactory::instance()->modifiedDocumentList();
	if (action == "first") {
		goToUrl(lst[0]);
	} else if (action == "previous") {
		int pos = lst.indexOf(d->mCurrentUrl);
		--pos;
		Q_ASSERT(pos >= 0);
		goToUrl(lst[pos]);
	} else if (action == "next") {
		int pos = lst.indexOf(d->mCurrentUrl);
		++pos;
		Q_ASSERT(pos < lst.size());
		goToUrl(lst[pos]);
	} else {
		kWarning() << "Unknown action: " << action ;
	}
}


void SaveBar::setCurrentUrl(const KUrl& url) {
	d->mCurrentUrl = url;
	updateContent();
}


} // namespace
