/*
 * Copyright (c) 2010-2014 Kevin Smith
 * Licensed under the GNU General Public License v3.
 * See Documentation/Licenses/GPLv3.txt for more information.
 */

#include <Swift/QtUI/Roster/QtTreeWidget.h>

#include <boost/smart_ptr/make_shared.hpp>
#include <boost/bind.hpp>

#include <QUrl>
#include <QMimeData>
#include <QObject>
#include <QLabel>
#include <QTimer>
#include <QToolTip>

#include <Swiften/Base/Platform.h>

#include <Swift/Controllers/Roster/ContactRosterItem.h>
#include <Swift/Controllers/Roster/GroupRosterItem.h>
#include <Swift/Controllers/UIEvents/UIEventStream.h>
#include <Swift/Controllers/UIEvents/RequestChatUIEvent.h>
#include <Swift/Controllers/UIEvents/SendFileUIEvent.h>
#include <Swift/Controllers/Settings/SettingsProvider.h>
 
#include <Swift/QtUI/QtUISettingConstants.h>
#include <Swift/QtUI/Roster/RosterModel.h>
#include <QtSwiftUtil.h>

namespace Swift {

QtTreeWidget::QtTreeWidget(UIEventStream* eventStream, SettingsProvider* settings, MessageTarget messageTarget, QWidget* parent) : QTreeView(parent), tooltipShown_(false), messageTarget_(messageTarget) {
	eventStream_ = eventStream;
	settings_ = settings;
	model_ = new RosterModel(this, settings_->getSetting(QtUISettingConstants::USE_SCREENREADER));
	setModel(model_);
	delegate_ = new RosterDelegate(this, settings_->getSetting(QtUISettingConstants::COMPACT_ROSTER));
	setItemDelegate(delegate_);
	setHeaderHidden(true);
#ifdef SWIFT_PLATFORM_MACOSX
	setAlternatingRowColors(true);
#endif
	setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
	expandAll();
	setAnimated(true);
	setIndentation(0);
#ifdef SWIFT_EXPERIMENTAL_FT
	setAcceptDrops(true);
#endif
	setDragEnabled(true);
	setRootIsDecorated(true);
	connect(this, SIGNAL(activated(const QModelIndex&)), this, SLOT(handleItemActivated(const QModelIndex&)));
	connect(model_, SIGNAL(itemExpanded(const QModelIndex&, bool)), this, SLOT(handleModelItemExpanded(const QModelIndex&, bool)));
	connect(this, SIGNAL(expanded(const QModelIndex&)), this, SLOT(handleExpanded(const QModelIndex&)));
	connect(this, SIGNAL(collapsed(const QModelIndex&)), this, SLOT(handleCollapsed(const QModelIndex&)));
	connect(this, SIGNAL(clicked(const QModelIndex&)), this, SLOT(handleClicked(const QModelIndex&)));

	settings_->onSettingChanged.connect(boost::bind(&QtTreeWidget::handleSettingChanged, this, _1));
}

QtTreeWidget::~QtTreeWidget() {
	settings_->onSettingChanged.disconnect(boost::bind(&QtTreeWidget::handleSettingChanged, this, _1));
	delete model_;
	delete delegate_;
}

void QtTreeWidget::handleSettingChanged(const std::string& setting) {
	if (setting == QtUISettingConstants::COMPACT_ROSTER.getKey()) {
		delegate_->setCompact(settings_->getSetting(QtUISettingConstants::COMPACT_ROSTER));
		repaint();
	}
}

void QtTreeWidget::handleRefreshTooltip() {
	if (tooltipShown_) {
		QPoint position = QCursor::pos();
		QModelIndex index = indexAt(mapFromGlobal(position));
		QToolTip::showText(position, model_->data(index, Qt::ToolTipRole).toString());
	}
}

void QtTreeWidget::setRosterModel(Roster* roster) {
	roster_ = roster;
	model_->setRoster(roster);
	expandAll();
}

void QtTreeWidget::refreshTooltip() {
	// Qt needs some time to emit the events we need to detect tooltip's visibility correctly; 20 ms should be enough
	QTimer::singleShot(20, this, SLOT(handleRefreshTooltip()));
}

QtTreeWidgetItem* QtTreeWidget::getRoot() {
	return treeRoot_;
}

void QtTreeWidget::handleClicked(const QModelIndex& index) {
	GroupRosterItem* item = dynamic_cast<GroupRosterItem*>(static_cast<RosterItem*>(index.internalPointer()));
	if (item) {
		setExpanded(index, !isExpanded(index));
	}
	currentChanged(index, QModelIndex());
}

QModelIndexList QtTreeWidget::getSelectedIndexes() const {
	// Not using selectedIndexes(), because this seems to cause a crash in Qt (4.7.0) in the
	// QModelIndexList destructor.
	// This is a workaround posted in http://www.qtcentre.org/threads/16933 (although this case
	// was resolved by linking against the debug libs, ours isn't, and we're not alone)
	QItemSelection ranges = selectionModel()->selection();
	QModelIndexList selectedIndexList;
	for (int i = 0; i < ranges.count(); ++i) {
		QModelIndex parent = ranges.at(i).parent();
		int right = ranges.at(i).model()->columnCount(parent) - 1;
		if (ranges.at(i).left() == 0 && ranges.at(i).right() == right) {
			for (int r = ranges.at(i).top(); r <= ranges.at(i).bottom(); ++r) {
				selectedIndexList.append(ranges.at(i).model()->index(r, 0, parent));
			}
		}
	}
	return selectedIndexList;
}

void QtTreeWidget::currentChanged(const QModelIndex& current, const QModelIndex& previous) {
	RosterItem* item = NULL;
	QModelIndexList selectedIndexList = getSelectedIndexes();
	if (selectedIndexList.empty() || !selectedIndexList[0].isValid()) {
		/* I didn't quite understand why using current didn't seem to work here.*/
	}
	else if (current.isValid()) {
		item = static_cast<RosterItem*>(current.internalPointer());
		item = dynamic_cast<ContactRosterItem*>(item);
	}
	onSomethingSelectedChanged(item);
	QTreeView::currentChanged(current, previous);
}

void QtTreeWidget::handleItemActivated(const QModelIndex& index) {
	JID target = jidFromIndex(index);
	if (target.isValid()) {
		eventStream_->send(boost::shared_ptr<UIEvent>(new RequestChatUIEvent(target)));
	}
}

void QtTreeWidget::dragEnterEvent(QDragEnterEvent *event) {
	if (event->mimeData()->hasUrls() && event->mimeData()->urls().size() == 1) {
		event->acceptProposedAction();
	}
}

void QtTreeWidget::dropEvent(QDropEvent *event) {
	QModelIndex index = indexAt(event->pos());
	if (index.isValid()) {
		RosterItem* item = static_cast<RosterItem*>(index.internalPointer());
		if (ContactRosterItem* contact = dynamic_cast<ContactRosterItem*>(item)) {
			if (contact->supportsFeature(ContactRosterItem::FileTransferFeature)) {
				QString filename = event->mimeData()->urls().at(0).toLocalFile();
				if (!filename.isEmpty()) {
					eventStream_->send(boost::make_shared<SendFileUIEvent>(contact->getJID(), Q2PSTRING(filename)));
				}
			}
		}
	}
}

void QtTreeWidget::dragMoveEvent(QDragMoveEvent* event) {
	QModelIndex index = indexAt(event->pos());
	if (index.isValid()) {
		RosterItem* item = static_cast<RosterItem*>(index.internalPointer());
		if (ContactRosterItem* contact = dynamic_cast<ContactRosterItem*>(item)) {
			if (contact->supportsFeature(ContactRosterItem::FileTransferFeature)) {
				event->accept();
				return;
			}
		}
	}
	QTreeView::dragMoveEvent(event);
}

bool QtTreeWidget::event(QEvent* event) {
	QChildEvent* childEvent = NULL;
	if ((childEvent = dynamic_cast<QChildEvent*>(event))) {
		if (childEvent->polished()) {
			if (dynamic_cast<QLabel*>(childEvent->child())) {
				tooltipShown_ = true;
			}
		}
		else if (childEvent->removed()) {
			if (childEvent->child()->objectName() == "qtooltip_label") {
				tooltipShown_ = false;
			}
		}
	}
	return QAbstractItemView::event(event);
}

void QtTreeWidget::handleExpanded(const QModelIndex& index) {
	GroupRosterItem* item = dynamic_cast<GroupRosterItem*>(static_cast<RosterItem*>(index.internalPointer()));
	if (item) {
		item->setExpanded(true);
	}
}

void QtTreeWidget::handleCollapsed(const QModelIndex& index) {
	GroupRosterItem* item = dynamic_cast<GroupRosterItem*>(static_cast<RosterItem*>(index.internalPointer()));
	if (item) {
		item->setExpanded(false);
	}
}

void QtTreeWidget::handleModelItemExpanded(const QModelIndex& index, bool shouldExpand) {
	if (!index.isValid()) {
		return;
	}
	bool alreadyRight = this->isExpanded(index) == shouldExpand;
	if (alreadyRight) {
		return;
	}
	setExpanded(index, shouldExpand);
}

void QtTreeWidget::drawBranches(QPainter*, const QRect&, const QModelIndex&) const {
}

void QtTreeWidget::show() {
	QWidget::show();
}

void QtTreeWidget::setMessageTarget(MessageTarget messageTarget) {
	messageTarget_ = messageTarget;
}

JID QtTreeWidget::jidFromIndex(const QModelIndex& index) const {
	JID target;
	if (messageTarget_ == MessageDisplayJID) {
		target = JID(Q2PSTRING(index.data(DisplayJIDRole).toString()));
		target = target.toBare();
	}
	if (!target.isValid()) {
		target = JID(Q2PSTRING(index.data(JIDRole).toString()));
	}
	return target;
}

JID QtTreeWidget::selectedJID() const {
	QModelIndexList list = selectedIndexes();
	if (list.size() != 1) {
		return JID();
	}
	return jidFromIndex(list[0]);
}

void QtTreeWidget::setOnline(bool isOnline) {
	isOnline_ = isOnline;
}

bool QtTreeWidget::isOnline() const {
	return isOnline_;
}

}