// This file is part of RSS Guard.
//
// Copyright (C) 2011-2017 by Martin Rotter <rotter.martinos@gmail.com>
//
// RSS Guard 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.
//
// RSS Guard 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 RSS Guard. If not, see <http://www.gnu.org/licenses/>.

#include "gui/dialogs/formmain.h"

#include "definitions/definitions.h"
#include "miscellaneous/settings.h"
#include "miscellaneous/application.h"
#include "miscellaneous/systemfactory.h"
#include "miscellaneous/mutex.h"
#include "miscellaneous/databasefactory.h"
#include "miscellaneous/iconfactory.h"
#include "miscellaneous/feedreader.h"
#include "network-web/webfactory.h"
#include "gui/feedsview.h"
#include "gui/messagebox.h"
#include "gui/systemtrayicon.h"
#include "gui/tabbar.h"
#include "gui/statusbar.h"
#include "gui/messagesview.h"
#include "gui/feedmessageviewer.h"
#include "gui/plaintoolbutton.h"
#include "gui/feedstoolbar.h"
#include "gui/messagestoolbar.h"
#include "gui/dialogs/formabout.h"
#include "gui/dialogs/formsettings.h"
#include "gui/dialogs/formupdate.h"
#include "gui/dialogs/formdatabasecleanup.h"
#include "gui/dialogs/formbackupdatabasesettings.h"
#include "gui/dialogs/formrestoredatabasesettings.h"
#include "gui/dialogs/formaddaccount.h"
#include "services/abstract/serviceroot.h"
#include "services/abstract/recyclebin.h"
#include "services/standard/gui/formstandardimportexport.h"
#include "services/owncloud/network/owncloudnetworkfactory.h"

#include <QCloseEvent>
#include <QRect>
#include <QScopedPointer>
#include <QDesktopWidget>
#include <QTimer>
#include <QFileDialog>

#if defined(USE_WEBENGINE)
#include "network-web/adblock/adblockicon.h"
#endif


FormMain::FormMain(QWidget* parent, Qt::WindowFlags f)
	: QMainWindow(parent, f), m_ui(new Ui::FormMain) {
	m_ui->setupUi(this);
#if defined(USE_WEBENGINE)
	m_adblockIcon = new AdBlockIcon(this);
	m_adblockIconAction = m_adblockIcon->menuAction();
	m_adblockIconAction->setObjectName(QSL("m_adblockIconAction"));
	m_ui->m_menuTools->addAction(m_adblockIconAction);
#endif
	qApp->setMainForm(this);
	// Add these actions to the list of actions of the main window.
	// This allows to use actions via shortcuts
	// even if main menu is not visible.
	addActions(allActions());
#if defined(USE_WEBENGINE)
	addAction(m_adblockIconAction);
#endif
	m_statusBar = new StatusBar(this);
	setStatusBar(m_statusBar);
	// Prepare main window and tabs.
	prepareMenus();
	// Prepare tabs.
	//m_ui->m_tabWidget->initializeTabs();
	tabWidget()->feedMessageViewer()->feedsToolBar()->loadSavedActions();
	tabWidget()->feedMessageViewer()->messagesToolBar()->loadSavedActions();
	// Establish connections.
	createConnections();
	updateMessageButtonsAvailability();
	updateFeedButtonsAvailability();
	// Setup some appearance of the window.
	setupIcons();
	loadSize();
	m_statusBar->loadSavedActions();
}

FormMain::~FormMain() {
	qDebug("Destroying FormMain instance.");
}

QMenu* FormMain::trayMenu() const {
	return m_trayMenu;
}

TabWidget* FormMain::tabWidget() const {
	return m_ui->m_tabWidget;
}

StatusBar* FormMain::statusBar() const {
	return m_statusBar;
}

void FormMain::showDbCleanupAssistant() {
	if (qApp->feedUpdateLock()->tryLock()) {
		QScopedPointer<FormDatabaseCleanup> form_pointer(new FormDatabaseCleanup(this));
		form_pointer.data()->setCleaner(qApp->feedReader()->databaseCleaner());
		form_pointer.data()->exec();
		qApp->feedUpdateLock()->unlock();
		tabWidget()->feedMessageViewer()->messagesView()->reloadSelections();
		qApp->feedReader()->feedsModel()->reloadCountsOfWholeModel();
	}

	else {
		qApp->showGuiMessage(tr("Cannot cleanup database"),
		                     tr("Cannot cleanup database, because another critical action is running."),
		                     QSystemTrayIcon::Warning, qApp->mainFormWidget(), true);
	}
}

QList<QAction*> FormMain::allActions() const {
	QList<QAction*> actions;
	// Add basic actions.
	actions << m_ui->m_actionSettings;
	actions << m_ui->m_actionDownloadManager;
	actions << m_ui->m_actionRestoreDatabaseSettings;
	actions << m_ui->m_actionBackupDatabaseSettings;
	actions << m_ui->m_actionRestart;
	actions << m_ui->m_actionQuit;
#if !defined(Q_OS_MAC)
	actions << m_ui->m_actionFullscreen;
#endif
	actions << m_ui->m_actionAboutGuard;
	actions << m_ui->m_actionSwitchFeedsList;
	actions << m_ui->m_actionSwitchMainWindow;
#if !defined(Q_OS_MAC)
	actions << m_ui->m_actionSwitchMainMenu;
#endif
	actions << m_ui->m_actionSwitchToolBars;
	actions << m_ui->m_actionSwitchListHeaders;
	actions << m_ui->m_actionSwitchStatusBar;
	actions << m_ui->m_actionSwitchMessageListOrientation;
	// Add feeds/messages actions.
	actions << m_ui->m_actionOpenSelectedSourceArticlesExternally;
	actions << m_ui->m_actionOpenSelectedMessagesInternally;
	actions << m_ui->m_actionMarkAllItemsRead;
	actions << m_ui->m_actionMarkSelectedItemsAsRead;
	actions << m_ui->m_actionMarkSelectedItemsAsUnread;
	actions << m_ui->m_actionClearSelectedItems;
	actions << m_ui->m_actionClearAllItems;
	actions << m_ui->m_actionShowOnlyUnreadItems;
	actions << m_ui->m_actionMarkSelectedMessagesAsRead;
	actions << m_ui->m_actionMarkSelectedMessagesAsUnread;
	actions << m_ui->m_actionSwitchImportanceOfSelectedMessages;
	actions << m_ui->m_actionDeleteSelectedMessages;
	actions << m_ui->m_actionUpdateAllItems;
	actions << m_ui->m_actionUpdateSelectedItems;
	actions << m_ui->m_actionStopRunningItemsUpdate;
	actions << m_ui->m_actionEditSelectedItem;
	actions << m_ui->m_actionDeleteSelectedItem;
	actions << m_ui->m_actionServiceAdd;
	actions << m_ui->m_actionServiceEdit;
	actions << m_ui->m_actionServiceDelete;
	actions << m_ui->m_actionCleanupDatabase;
	actions << m_ui->m_actionAddFeedIntoSelectedAccount;
	actions << m_ui->m_actionAddCategoryIntoSelectedAccount;
	actions << m_ui->m_actionViewSelectedItemsNewspaperMode;
	actions << m_ui->m_actionSelectNextItem;
	actions << m_ui->m_actionSelectPreviousItem;
	actions << m_ui->m_actionSelectNextMessage;
	actions << m_ui->m_actionSelectPreviousMessage;
	actions << m_ui->m_actionSelectNextUnreadMessage;
	actions << m_ui->m_actionExpandCollapseItem;
#if defined(USE_WEBENGINE)
	actions << m_ui->m_actionTabNewWebBrowser;
	actions << m_adblockIconAction;
#endif
	actions << m_ui->m_actionTabsCloseAll;
	actions << m_ui->m_actionTabsCloseAllExceptCurrent;
	return actions;
}

void FormMain::prepareMenus() {
	// Setup menu for tray icon.
	if (SystemTrayIcon::isSystemTrayAvailable()) {
#if defined(Q_OS_WIN)
		m_trayMenu = new TrayIconMenu(APP_NAME, this);
#else
		m_trayMenu = new QMenu(QSL(APP_NAME), this);
#endif
		// Add needed items to the menu.
		m_trayMenu->addAction(m_ui->m_actionSwitchMainWindow);
		m_trayMenu->addSeparator();
		m_trayMenu->addAction(m_ui->m_actionUpdateAllItems);
		m_trayMenu->addAction(m_ui->m_actionMarkAllItemsRead);
		m_trayMenu->addSeparator();
		m_trayMenu->addAction(m_ui->m_actionSettings);
		m_trayMenu->addAction(m_ui->m_actionQuit);
		qDebug("Creating tray icon menu.");
	}

#if !defined(USE_WEBENGINE)
	m_ui->m_menuWebBrowserTabs->removeAction(m_ui->m_actionTabNewWebBrowser);
	m_ui->m_menuWebBrowserTabs->setTitle(tr("Tabs"));
#endif
#if defined(Q_OS_MAC)
	m_ui->m_actionSwitchMainMenu->setVisible(false);
	m_ui->m_actionFullscreen->setVisible(false);
#endif
}

void FormMain::switchFullscreenMode() {
	if (!isFullScreen()) {
		qApp->settings()->setValue(GROUP(GUI), GUI::IsMainWindowMaximizedBeforeFullscreen, isMaximized());
		showFullScreen();
	}

	else {
		if (qApp->settings()->value(GROUP(GUI), SETTING(GUI::IsMainWindowMaximizedBeforeFullscreen)).toBool()) {
			setWindowState((windowState() & ~Qt::WindowFullScreen) | Qt::WindowMaximized);
		}

		else {
			showNormal();
		}
	}
}

void FormMain::updateAddItemMenu() {
	// NOTE: Clear here deletes items from memory but only those OWNED by the menu.
	m_ui->m_menuAddItem->clear();

	foreach (ServiceRoot* activated_root, qApp->feedReader()->feedsModel()->serviceRoots()) {
		QMenu* root_menu = new QMenu(activated_root->title(), m_ui->m_menuAddItem);
		root_menu->setIcon(activated_root->icon());
		root_menu->setToolTip(activated_root->description());
		QList<QAction*> specific_root_actions = activated_root->addItemMenu();

		if (activated_root->supportsCategoryAdding()) {
			QAction* action_new_category = new QAction(qApp->icons()->fromTheme(QSL("folder")),
			                                           tr("Add new category"),
			                                           m_ui->m_menuAddItem);
			root_menu->addAction(action_new_category);
			connect(action_new_category, &QAction::triggered, activated_root, &ServiceRoot::addNewCategory);
		}

		if (activated_root->supportsFeedAdding()) {
			QAction* action_new_feed = new QAction(qApp->icons()->fromTheme(QSL("application-rss+xml")),
			                                       tr("Add new feed"),
			                                       m_ui->m_menuAddItem);
			root_menu->addAction(action_new_feed);
			// NOTE: Because of default arguments.
			connect(action_new_feed, SIGNAL(triggered(bool)), activated_root, SLOT(addNewFeed()));
		}

		if (!specific_root_actions.isEmpty()) {
			if (!root_menu->isEmpty()) {
				root_menu->addSeparator();
			}

			root_menu->addActions(specific_root_actions);
		}

		m_ui->m_menuAddItem->addMenu(root_menu);
	}

	if (!m_ui->m_menuAddItem->isEmpty()) {
		m_ui->m_menuAddItem->addSeparator();
		m_ui->m_menuAddItem->addAction(m_ui->m_actionAddCategoryIntoSelectedAccount);
		m_ui->m_menuAddItem->addAction(m_ui->m_actionAddFeedIntoSelectedAccount);
	}

	else {
		m_ui->m_menuAddItem->addAction(m_ui->m_actionNoActions);
	}
}

void FormMain::updateRecycleBinMenu() {
	m_ui->m_menuRecycleBin->clear();

	foreach (const ServiceRoot* activated_root, qApp->feedReader()->feedsModel()->serviceRoots()) {
		QMenu* root_menu = new QMenu(activated_root->title(), m_ui->m_menuRecycleBin);
		root_menu->setIcon(activated_root->icon());
		root_menu->setToolTip(activated_root->description());
		RecycleBin* bin = activated_root->recycleBin();
		QList<QAction*> context_menu;

		if (bin == nullptr) {
			QAction* no_action = new QAction(qApp->icons()->fromTheme(QSL("dialog-error")),
			                                 tr("No recycle bin"),
			                                 m_ui->m_menuRecycleBin);
			no_action->setEnabled(false);
			root_menu->addAction(no_action);
		}

		else if ((context_menu = bin->contextMenu()).isEmpty()) {
			QAction* no_action = new QAction(qApp->icons()->fromTheme(QSL("dialog-error")),
			                                 tr("No actions possible"),
			                                 m_ui->m_menuRecycleBin);
			no_action->setEnabled(false);
			root_menu->addAction(no_action);
		}

		else {
			root_menu->addActions(context_menu);
		}

		m_ui->m_menuRecycleBin->addMenu(root_menu);
	}

	if (!m_ui->m_menuRecycleBin->isEmpty()) {
		m_ui->m_menuRecycleBin->addSeparator();
	}

	m_ui->m_menuRecycleBin->addAction(m_ui->m_actionRestoreAllRecycleBins);
	m_ui->m_menuRecycleBin->addAction(m_ui->m_actionEmptyAllRecycleBins);
}

void FormMain::updateAccountsMenu() {
	m_ui->m_menuAccounts->clear();

	foreach (ServiceRoot* activated_root, qApp->feedReader()->feedsModel()->serviceRoots()) {
		QMenu* root_menu = new QMenu(activated_root->title(), m_ui->m_menuAccounts);
		root_menu->setIcon(activated_root->icon());
		root_menu->setToolTip(activated_root->description());
		QList<QAction*> root_actions = activated_root->serviceMenu();

		if (root_actions.isEmpty()) {
			QAction* no_action = new QAction(qApp->icons()->fromTheme(QSL("dialog-error")),
			                                 tr("No possible actions"),
			                                 m_ui->m_menuAccounts);
			no_action->setEnabled(false);
			root_menu->addAction(no_action);
		}

		else {
			root_menu->addActions(root_actions);
		}

		m_ui->m_menuAccounts->addMenu(root_menu);
	}

	if (m_ui->m_menuAccounts->actions().size() > 0) {
		m_ui->m_menuAccounts->addSeparator();
	}

	m_ui->m_menuAccounts->addAction(m_ui->m_actionServiceAdd);
	m_ui->m_menuAccounts->addAction(m_ui->m_actionServiceEdit);
	m_ui->m_menuAccounts->addAction(m_ui->m_actionServiceDelete);
}

void FormMain::onFeedUpdatesFinished(const FeedDownloadResults& results) {
	Q_UNUSED(results)
	statusBar()->clearProgressFeeds();
	tabWidget()->feedMessageViewer()->messagesView()->reloadSelections();
}

void FormMain::onFeedUpdatesStarted() {
	m_ui->m_actionStopRunningItemsUpdate->setEnabled(true);
	statusBar()->showProgressFeeds(0, tr("Feed update started"));
}

void FormMain::onFeedUpdatesProgress(const Feed* feed, int current, int total) {
	statusBar()->showProgressFeeds((current * 100.0) / total,
	                               //: Text display in status bar when particular feed is updated.
	                               tr("Updated feed '%1'").arg(feed->title()));
}

void FormMain::updateMessageButtonsAvailability() {
	const bool one_message_selected = tabWidget()->feedMessageViewer()->messagesView()->selectionModel()->selectedRows().size() == 1;
	const bool atleast_one_message_selected = !tabWidget()->feedMessageViewer()->messagesView()->selectionModel()->selectedRows().isEmpty();
	const bool bin_loaded = tabWidget()->feedMessageViewer()->messagesView()->sourceModel()->loadedItem() != nullptr
	                        && tabWidget()->feedMessageViewer()->messagesView()->sourceModel()->loadedItem()->kind() == RootItemKind::Bin;
	m_ui->m_actionDeleteSelectedMessages->setEnabled(atleast_one_message_selected);
	m_ui->m_actionRestoreSelectedMessages->setEnabled(atleast_one_message_selected && bin_loaded);
	m_ui->m_actionMarkSelectedMessagesAsRead->setEnabled(atleast_one_message_selected);
	m_ui->m_actionMarkSelectedMessagesAsUnread->setEnabled(atleast_one_message_selected);
	m_ui->m_actionOpenSelectedMessagesInternally->setEnabled(atleast_one_message_selected);
	m_ui->m_actionOpenSelectedSourceArticlesExternally->setEnabled(atleast_one_message_selected);
	m_ui->m_actionSendMessageViaEmail->setEnabled(one_message_selected);
	m_ui->m_actionSwitchImportanceOfSelectedMessages->setEnabled(atleast_one_message_selected);
}

void FormMain::updateFeedButtonsAvailability() {
	const bool is_update_running = qApp->feedReader()->isFeedUpdateRunning();
	const bool critical_action_running = qApp->feedUpdateLock()->isLocked();
	const RootItem* selected_item = tabWidget()->feedMessageViewer()->feedsView()->selectedItem();
	const bool anything_selected = selected_item != nullptr;
	const bool feed_selected = anything_selected && selected_item->kind() == RootItemKind::Feed;
	const bool category_selected = anything_selected && selected_item->kind() == RootItemKind::Category;
	const bool service_selected = anything_selected && selected_item->kind() == RootItemKind::ServiceRoot;
	m_ui->m_actionStopRunningItemsUpdate->setEnabled(is_update_running);
	m_ui->m_actionBackupDatabaseSettings->setEnabled(!critical_action_running);
	m_ui->m_actionCleanupDatabase->setEnabled(!critical_action_running);
	m_ui->m_actionClearSelectedItems->setEnabled(anything_selected);
	m_ui->m_actionDeleteSelectedItem->setEnabled(!critical_action_running && anything_selected);
	m_ui->m_actionEditSelectedItem->setEnabled(!critical_action_running && anything_selected);
	m_ui->m_actionMarkSelectedItemsAsRead->setEnabled(anything_selected);
	m_ui->m_actionMarkSelectedItemsAsUnread->setEnabled(anything_selected);
	m_ui->m_actionUpdateAllItems->setEnabled(!critical_action_running);
	m_ui->m_actionUpdateSelectedItems->setEnabled(!critical_action_running && (feed_selected || category_selected || service_selected));
	m_ui->m_actionViewSelectedItemsNewspaperMode->setEnabled(anything_selected);
	m_ui->m_actionExpandCollapseItem->setEnabled(anything_selected);
	m_ui->m_actionServiceDelete->setEnabled(service_selected);
	m_ui->m_actionServiceEdit->setEnabled(service_selected);
	m_ui->m_actionAddFeedIntoSelectedAccount->setEnabled(anything_selected);
	m_ui->m_actionAddCategoryIntoSelectedAccount->setEnabled(anything_selected);
	m_ui->m_menuAddItem->setEnabled(!critical_action_running);
	m_ui->m_menuAccounts->setEnabled(!critical_action_running);
	m_ui->m_menuRecycleBin->setEnabled(!critical_action_running);
}

void FormMain::switchVisibility(bool force_hide) {
	if (force_hide || isVisible()) {
		if (SystemTrayIcon::isSystemTrayActivated()) {
			hide();
		}

		else {
			// Window gets minimized in single-window mode.
			showMinimized();
		}
	}

	else {
		display();
	}
}

void FormMain::display() {
	// Make sure window is not minimized.
	setWindowState(windowState() & ~Qt::WindowMinimized);
	// Display the window and make sure it is raised on top.
	show();
	activateWindow();
	raise();
	// Raise alert event. Check the documentation for more info on this.
	Application::alert(this);
}

void FormMain::setupIcons() {
	IconFactory* icon_theme_factory = qApp->icons();
	// Setup icons of this main window.
	m_ui->m_actionDownloadManager->setIcon(icon_theme_factory->fromTheme(QSL("emblem-downloads")));
	m_ui->m_actionSettings->setIcon(icon_theme_factory->fromTheme(QSL("document-properties")));
	m_ui->m_actionQuit->setIcon(icon_theme_factory->fromTheme(QSL("application-exit")));
	m_ui->m_actionRestart->setIcon(icon_theme_factory->fromTheme(QSL("view-refresh")));
	m_ui->m_actionAboutGuard->setIcon(icon_theme_factory->fromTheme(QSL("help-about")));
	m_ui->m_actionCheckForUpdates->setIcon(icon_theme_factory->fromTheme(QSL("system-upgrade")));
	m_ui->m_actionCleanupDatabase->setIcon(icon_theme_factory->fromTheme(QSL("edit-clear")));
	m_ui->m_actionReportBug->setIcon(icon_theme_factory->fromTheme(QSL("call-start")));
	m_ui->m_actionBackupDatabaseSettings->setIcon(icon_theme_factory->fromTheme(QSL("document-export")));
	m_ui->m_actionRestoreDatabaseSettings->setIcon(icon_theme_factory->fromTheme(QSL("document-import")));
	m_ui->m_actionDonate->setIcon(icon_theme_factory->fromTheme(QSL("applications-office")));
	m_ui->m_actionDisplayWiki->setIcon(icon_theme_factory->fromTheme(QSL("applications-science")));
	// View.
	m_ui->m_actionSwitchMainWindow->setIcon(icon_theme_factory->fromTheme(QSL("window-close")));
	m_ui->m_actionFullscreen->setIcon(icon_theme_factory->fromTheme(QSL("view-fullscreen")));
	m_ui->m_actionSwitchFeedsList->setIcon(icon_theme_factory->fromTheme(QSL("view-restore")));
	m_ui->m_actionSwitchMainMenu->setIcon(icon_theme_factory->fromTheme(QSL("view-restore")));
	m_ui->m_actionSwitchToolBars->setIcon(icon_theme_factory->fromTheme(QSL("view-restore")));
	m_ui->m_actionSwitchListHeaders->setIcon(icon_theme_factory->fromTheme(QSL("view-restore")));
	m_ui->m_actionSwitchStatusBar->setIcon(icon_theme_factory->fromTheme(QSL("dialog-information")));
	m_ui->m_actionSwitchMessageListOrientation->setIcon(icon_theme_factory->fromTheme(QSL("view-restore")));
	m_ui->m_menuShowHide->setIcon(icon_theme_factory->fromTheme(QSL("view-restore")));
	// Feeds/messages.
	m_ui->m_menuAddItem->setIcon(icon_theme_factory->fromTheme(QSL("list-add")));
	m_ui->m_actionStopRunningItemsUpdate->setIcon(icon_theme_factory->fromTheme(QSL("process-stop")));
	m_ui->m_actionUpdateAllItems->setIcon(icon_theme_factory->fromTheme(QSL("view-refresh")));
	m_ui->m_actionUpdateSelectedItems->setIcon(icon_theme_factory->fromTheme(QSL("view-refresh")));
	m_ui->m_actionClearSelectedItems->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-junk")));
	m_ui->m_actionClearAllItems->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-junk")));
	m_ui->m_actionDeleteSelectedItem->setIcon(icon_theme_factory->fromTheme(QSL("list-remove")));
	m_ui->m_actionDeleteSelectedMessages->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-junk")));
	m_ui->m_actionEditSelectedItem->setIcon(icon_theme_factory->fromTheme(QSL("document-edit")));
	m_ui->m_actionMarkAllItemsRead->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-read")));
	m_ui->m_actionMarkSelectedItemsAsRead->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-read")));
	m_ui->m_actionMarkSelectedItemsAsUnread->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-unread")));
	m_ui->m_actionMarkSelectedMessagesAsRead->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-read")));
	m_ui->m_actionMarkSelectedMessagesAsUnread->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-unread")));
	m_ui->m_actionSwitchImportanceOfSelectedMessages->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-important")));
	m_ui->m_actionOpenSelectedSourceArticlesExternally->setIcon(icon_theme_factory->fromTheme(QSL("document-open")));
	m_ui->m_actionOpenSelectedMessagesInternally->setIcon(icon_theme_factory->fromTheme(QSL("document-open")));
	m_ui->m_actionSendMessageViaEmail->setIcon(icon_theme_factory->fromTheme(QSL("mail-send")));
	m_ui->m_actionViewSelectedItemsNewspaperMode->setIcon(icon_theme_factory->fromTheme(QSL("format-justify-fill")));
	m_ui->m_actionSelectNextItem->setIcon(icon_theme_factory->fromTheme(QSL("go-down")));
	m_ui->m_actionSelectPreviousItem->setIcon(icon_theme_factory->fromTheme(QSL("go-up")));
	m_ui->m_actionSelectNextMessage->setIcon(icon_theme_factory->fromTheme(QSL("go-down")));
	m_ui->m_actionSelectPreviousMessage->setIcon(icon_theme_factory->fromTheme(QSL("go-up")));
	m_ui->m_actionSelectNextUnreadMessage->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-unread")));
	m_ui->m_actionShowOnlyUnreadItems->setIcon(icon_theme_factory->fromTheme(QSL("mail-mark-unread")));
	m_ui->m_actionExpandCollapseItem->setIcon(icon_theme_factory->fromTheme(QSL("format-indent-more")));
	m_ui->m_actionRestoreSelectedMessages->setIcon(icon_theme_factory->fromTheme(QSL("view-refresh")));
	m_ui->m_actionRestoreAllRecycleBins->setIcon(icon_theme_factory->fromTheme(QSL("view-refresh")));
	m_ui->m_actionEmptyAllRecycleBins->setIcon(icon_theme_factory->fromTheme(QSL("edit-clear")));
	m_ui->m_actionServiceAdd->setIcon(icon_theme_factory->fromTheme(QSL("list-add")));
	m_ui->m_actionServiceEdit->setIcon(icon_theme_factory->fromTheme(QSL("document-edit")));
	m_ui->m_actionServiceDelete->setIcon(icon_theme_factory->fromTheme(QSL("list-remove")));
	m_ui->m_actionAddFeedIntoSelectedAccount->setIcon(icon_theme_factory->fromTheme(QSL("application-rss+xml")));
	m_ui->m_actionAddCategoryIntoSelectedAccount->setIcon(icon_theme_factory->fromTheme(QSL("folder")));
	// Tabs & web browser.
	m_ui->m_actionTabNewWebBrowser->setIcon(icon_theme_factory->fromTheme(QSL("tab-new")));
	m_ui->m_actionTabsCloseAll->setIcon(icon_theme_factory->fromTheme(QSL("window-close")));
	m_ui->m_actionTabsCloseAllExceptCurrent->setIcon(icon_theme_factory->fromTheme(QSL("window-close")));
	// Setup icons on TabWidget too.
	m_ui->m_tabWidget->setupIcons();
}

void FormMain::loadSize() {
	const QRect screen = qApp->desktop()->screenGeometry();
	const Settings* settings = qApp->settings();
	// Reload main window size & position.
	resize(settings->value(GROUP(GUI), GUI::MainWindowInitialSize, size()).toSize());
	move(settings->value(GROUP(GUI), GUI::MainWindowInitialPosition, screen.center() - rect().center()).toPoint());

	if (settings->value(GROUP(GUI), SETTING(GUI::MainWindowStartsMaximized)).toBool()) {
		setWindowState(windowState() | Qt::WindowMaximized);
		// We process events so that window is really maximized fast.
		qApp->processEvents();
	}

	// If user exited the application while in fullsreen mode,
	// then re-enable it now.
	if (settings->value(GROUP(GUI), SETTING(GUI::MainWindowStartsFullscreen)).toBool()) {
		m_ui->m_actionFullscreen->setChecked(true);
	}

	// Hide the main menu if user wants it.
	m_ui->m_actionSwitchMainMenu->setChecked(settings->value(GROUP(GUI), SETTING(GUI::MainMenuVisible)).toBool());
	// Adjust dimensions of "feeds & messages" widget.
	m_ui->m_tabWidget->feedMessageViewer()->loadSize();
	m_ui->m_actionSwitchToolBars->setChecked(settings->value(GROUP(GUI), SETTING(GUI::ToolbarsVisible)).toBool());
	m_ui->m_actionSwitchListHeaders->setChecked(settings->value(GROUP(GUI), SETTING(GUI::ListHeadersVisible)).toBool());
	m_ui->m_actionSwitchStatusBar->setChecked(settings->value(GROUP(GUI), SETTING(GUI::StatusBarVisible)).toBool());
	// Make sure that only unread feeds are shown if user has that feature set on.
	m_ui->m_actionShowOnlyUnreadItems->setChecked(settings->value(GROUP(Feeds), SETTING(Feeds::ShowOnlyUnreadFeeds)).toBool());
}

void FormMain::saveSize() {
	Settings* settings = qApp->settings();
	bool is_fullscreen = isFullScreen();
	bool is_maximized = false;

	if (is_fullscreen) {
		m_ui->m_actionFullscreen->setChecked(false);
		// We (process events to really) un-fullscreen, so that we can determine if window is really maximized.
		qApp->processEvents();
	}

	if (isMaximized()) {
		is_maximized = true;
		// Window is maximized, we store that fact to settings and unmaximize.
		qApp->settings()->setValue(GROUP(GUI), GUI::IsMainWindowMaximizedBeforeFullscreen, isMaximized());
		setWindowState((windowState() & ~Qt::WindowMaximized) | Qt::WindowActive);
		// We process events to really have window un-maximized.
		qApp->processEvents();
	}

	settings->setValue(GROUP(GUI), GUI::MainMenuVisible, m_ui->m_actionSwitchMainMenu->isChecked());
	settings->setValue(GROUP(GUI), GUI::MainWindowInitialPosition, pos());
	settings->setValue(GROUP(GUI), GUI::MainWindowInitialSize, size());
	settings->setValue(GROUP(GUI), GUI::MainWindowStartsMaximized, is_maximized);
	settings->setValue(GROUP(GUI), GUI::MainWindowStartsFullscreen, is_fullscreen);
	settings->setValue(GROUP(GUI), GUI::StatusBarVisible, m_ui->m_actionSwitchStatusBar->isChecked());
	m_ui->m_tabWidget->feedMessageViewer()->saveSize();
}

void FormMain::createConnections() {
	// Status bar connections.
	connect(m_ui->m_menuAddItem, &QMenu::aboutToShow, this, &FormMain::updateAddItemMenu);
	connect(m_ui->m_menuRecycleBin, &QMenu::aboutToShow, this, &FormMain::updateRecycleBinMenu);
	connect(m_ui->m_menuAccounts, &QMenu::aboutToShow, this, &FormMain::updateAccountsMenu);
	connect(m_ui->m_actionServiceDelete, &QAction::triggered, m_ui->m_actionDeleteSelectedItem, &QAction::triggered);
	connect(m_ui->m_actionServiceEdit, &QAction::triggered, m_ui->m_actionEditSelectedItem, &QAction::triggered);
	// Menu "File" connections.
	connect(m_ui->m_actionBackupDatabaseSettings, &QAction::triggered, this, &FormMain::backupDatabaseSettings);
	connect(m_ui->m_actionRestoreDatabaseSettings, &QAction::triggered, this, &FormMain::restoreDatabaseSettings);
	connect(m_ui->m_actionQuit, &QAction::triggered, qApp, &Application::quit);
	connect(m_ui->m_actionServiceAdd, &QAction::triggered, this, &FormMain::showAddAccountDialog);
	connect(m_ui->m_actionRestart, &QAction::triggered, qApp, &Application::restart);
	// Menu "View" connections.
	connect(m_ui->m_actionFullscreen, &QAction::toggled, this, &FormMain::switchFullscreenMode);
	connect(m_ui->m_actionSwitchMainMenu, &QAction::toggled, m_ui->m_menuBar, &QMenuBar::setVisible);
	connect(m_ui->m_actionSwitchMainWindow, &QAction::triggered, this, &FormMain::switchVisibility);
	connect(m_ui->m_actionSwitchStatusBar, &QAction::toggled, statusBar(), &StatusBar::setVisible);
	// Menu "Tools" connections.
	connect(m_ui->m_actionSettings, &QAction::triggered, this, &FormMain::showSettings);
	connect(m_ui->m_actionDownloadManager, &QAction::triggered, m_ui->m_tabWidget, &TabWidget::showDownloadManager);
	connect(m_ui->m_actionCleanupDatabase, &QAction::triggered, this, &FormMain::showDbCleanupAssistant);
	// Menu "Help" connections.
	connect(m_ui->m_actionAboutGuard, &QAction::triggered, this, &FormMain::showAbout);
	connect(m_ui->m_actionCheckForUpdates, &QAction::triggered, this, &FormMain::showUpdates);
	connect(m_ui->m_actionReportBug, &QAction::triggered, this, &FormMain::reportABug);
	connect(m_ui->m_actionDonate, &QAction::triggered, this, &FormMain::donate);
	connect(m_ui->m_actionDisplayWiki, &QAction::triggered, this, &FormMain::showWiki);
	// Tab widget connections.
	connect(m_ui->m_actionTabsCloseAllExceptCurrent, &QAction::triggered, m_ui->m_tabWidget, &TabWidget::closeAllTabsExceptCurrent);
	connect(m_ui->m_actionTabsCloseAll, &QAction::triggered, m_ui->m_tabWidget, &TabWidget::closeAllTabs);
	connect(m_ui->m_actionTabNewWebBrowser, &QAction::triggered, m_ui->m_tabWidget, &TabWidget::addEmptyBrowser);
	connect(tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::itemSelected, this, &FormMain::updateFeedButtonsAvailability);
	connect(qApp->feedUpdateLock(), &Mutex::locked, this, &FormMain::updateFeedButtonsAvailability);
	connect(qApp->feedUpdateLock(), &Mutex::unlocked, this, &FormMain::updateFeedButtonsAvailability);
	connect(tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::currentMessageRemoved,
	        this, &FormMain::updateMessageButtonsAvailability);
	connect(tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::currentMessageChanged,
	        this, &FormMain::updateMessageButtonsAvailability);
	connect(qApp->feedReader(), &FeedReader::feedUpdatesStarted, this, &FormMain::onFeedUpdatesStarted);
	connect(qApp->feedReader(), &FeedReader::feedUpdatesProgress, this, &FormMain::onFeedUpdatesProgress);
	connect(qApp->feedReader(), &FeedReader::feedUpdatesFinished, this, &FormMain::onFeedUpdatesFinished);
	// Toolbar forwardings.
	connect(m_ui->m_actionAddFeedIntoSelectedAccount, &QAction::triggered,
	        tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::addFeedIntoSelectedAccount);
	connect(m_ui->m_actionAddCategoryIntoSelectedAccount, &QAction::triggered,
	        tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::addCategoryIntoSelectedAccount);
	connect(m_ui->m_actionSwitchImportanceOfSelectedMessages,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::switchSelectedMessagesImportance);
	connect(m_ui->m_actionDeleteSelectedMessages,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::deleteSelectedMessages);
	connect(m_ui->m_actionMarkSelectedMessagesAsRead,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::markSelectedMessagesRead);
	connect(m_ui->m_actionMarkSelectedMessagesAsUnread, &QAction::triggered,
	        tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::markSelectedMessagesUnread);
	connect(m_ui->m_actionOpenSelectedSourceArticlesExternally,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::openSelectedSourceMessagesExternally);
	connect(m_ui->m_actionOpenSelectedMessagesInternally,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::openSelectedMessagesInternally);
	connect(m_ui->m_actionSendMessageViaEmail,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::sendSelectedMessageViaEmail);
	connect(m_ui->m_actionMarkAllItemsRead,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::markAllItemsRead);
	connect(m_ui->m_actionMarkSelectedItemsAsRead,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::markSelectedItemRead);
	connect(m_ui->m_actionExpandCollapseItem,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::expandCollapseCurrentItem);
	connect(m_ui->m_actionMarkSelectedItemsAsUnread,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::markSelectedItemUnread);
	connect(m_ui->m_actionClearSelectedItems,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::clearSelectedFeeds);
	connect(m_ui->m_actionClearAllItems,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::clearAllFeeds);
	connect(m_ui->m_actionUpdateSelectedItems,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::updateSelectedItems);
	connect(m_ui->m_actionUpdateAllItems,
	        &QAction::triggered, qApp->feedReader(), &FeedReader::updateAllFeeds);
	connect(m_ui->m_actionStopRunningItemsUpdate,
	        &QAction::triggered, qApp->feedReader(), &FeedReader::stopRunningFeedUpdate);
	connect(m_ui->m_actionEditSelectedItem,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::editSelectedItem);
	connect(m_ui->m_actionViewSelectedItemsNewspaperMode,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::openSelectedItemsInNewspaperMode);
	connect(m_ui->m_actionDeleteSelectedItem,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::deleteSelectedItem);
	connect(m_ui->m_actionSwitchFeedsList, &QAction::triggered,
	        tabWidget()->feedMessageViewer(), &FeedMessageViewer::switchFeedComponentVisibility);
	connect(m_ui->m_actionSelectNextItem,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::selectNextItem);
	connect(m_ui->m_actionSwitchToolBars, &QAction::toggled,
	        tabWidget()->feedMessageViewer(), &FeedMessageViewer::setToolBarsEnabled);
	connect(m_ui->m_actionSwitchListHeaders, &QAction::toggled,
	        tabWidget()->feedMessageViewer(), &FeedMessageViewer::setListHeadersEnabled);
	connect(m_ui->m_actionSelectPreviousItem,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->feedsView(), &FeedsView::selectPreviousItem);
	connect(m_ui->m_actionSelectNextMessage,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::selectNextItem);
	connect(m_ui->m_actionSelectNextUnreadMessage,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::selectNextUnreadItem);
	connect(m_ui->m_actionSelectPreviousMessage,
	        &QAction::triggered, tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::selectPreviousItem);
	connect(m_ui->m_actionSwitchMessageListOrientation, &QAction::triggered,
	        tabWidget()->feedMessageViewer(), &FeedMessageViewer::switchMessageSplitterOrientation);
	connect(m_ui->m_actionShowOnlyUnreadItems, &QAction::toggled,
	        tabWidget()->feedMessageViewer(), &FeedMessageViewer::toggleShowOnlyUnreadFeeds);
	connect(m_ui->m_actionRestoreSelectedMessages, &QAction::triggered,
	        tabWidget()->feedMessageViewer()->messagesView(), &MessagesView::restoreSelectedMessages);
	connect(m_ui->m_actionRestoreAllRecycleBins, &QAction::triggered,
	        tabWidget()->feedMessageViewer()->feedsView()->sourceModel(), &FeedsModel::restoreAllBins);
	connect(m_ui->m_actionEmptyAllRecycleBins, &QAction::triggered,
	        tabWidget()->feedMessageViewer()->feedsView()->sourceModel(), &FeedsModel::emptyAllBins);
}

void FormMain::backupDatabaseSettings() {
	QScopedPointer<FormBackupDatabaseSettings> form(new FormBackupDatabaseSettings(this));
	form->exec();
}

void FormMain::restoreDatabaseSettings() {
	QScopedPointer<FormRestoreDatabaseSettings> form(new FormRestoreDatabaseSettings(this));
	form->exec();

	if (form->shouldRestart()) {
		qApp->restart();
	}
}

void FormMain::changeEvent(QEvent* event) {
	switch (event->type()) {
		case QEvent::WindowStateChange: {
			if (windowState() & Qt::WindowMinimized &&
			        SystemTrayIcon::isSystemTrayActivated() &&
			        qApp->settings()->value(GROUP(GUI), SETTING(GUI::HideMainWindowWhenMinimized)).toBool()) {
				event->ignore();
				QTimer::singleShot(CHANGE_EVENT_DELAY, this, SLOT(switchVisibility()));
			}

			break;
		}

		default:
			break;
	}

	QMainWindow::changeEvent(event);
}

void FormMain::showAbout() {
	QScopedPointer<FormAbout> form_pointer(new FormAbout(this));
	form_pointer->exec();
}

void FormMain::showUpdates() {
	QScopedPointer<FormUpdate> form_update(new FormUpdate(this));
	form_update->exec();
}

void FormMain::showWiki() {
	if (!WebFactory::instance()->openUrlInExternalBrowser(APP_URL_WIKI)) {
		qApp->showGuiMessage(tr("Cannot open external browser"),
		                     tr("Cannot open external browser. Navigate to application website manually."),
		                     QSystemTrayIcon::Warning, this, true);
	}
}

void FormMain::showAddAccountDialog() {
	QScopedPointer<FormAddAccount> form_update(new FormAddAccount(qApp->feedReader()->feedServices(),
	                                           qApp->feedReader()->feedsModel(),
	                                           this));
	form_update->exec();
}

void FormMain::reportABug() {
	if (!WebFactory::instance()->openUrlInExternalBrowser(QSL(APP_URL_ISSUES_NEW))) {
		qApp->showGuiMessage(tr("Cannot open external browser"),
		                     tr("Cannot open external browser. Navigate to application website manually."),
		                     QSystemTrayIcon::Warning, this, true);
	}
}

void FormMain::donate() {
	if (!WebFactory::instance()->openUrlInExternalBrowser(QSL(APP_DONATE_URL))) {
		qApp->showGuiMessage(tr("Cannot open external browser"),
		                     tr("Cannot open external browser. Navigate to application website manually."),
		                     QSystemTrayIcon::Warning, this, true);
	}
}

void FormMain::showSettings() {
	QScopedPointer<FormSettings> form_pointer(new FormSettings(this));
	form_pointer->exec();
}