/*
 * Copyright 2014 Javier S. Pedro <maemo@javispedro.com>
 *
 * This file is part of TopMenu.
 *
 * TopMenu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * TopMenu 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with TopMenu.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <gtk/gtk.h>
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtGui/QMenuBar>

#include "appmenu.h"

AppMenu::AppMenu(QObject *parent)
    : MenuProxy(parent), m_menu(0)

{
}

AppMenu::~AppMenu()
{
	if (m_menu) {
		gtk_widget_destroy(GTK_WIDGET(m_menu));
		g_object_unref(m_menu);
	}
}

GtkMenu * AppMenu::getGtkMenu()
{
	if (!m_menu) {
		m_menu = GTK_MENU(gtk_menu_new());
		g_object_ref_sink(m_menu);
		setTargetMenu(GTK_MENU_SHELL(m_menu));
		addDefaultItems();
	}
	return m_menu;
}

GtkMenuItem * AppMenu::addAction(QAction* action)
{
	QAction::MenuRole role = detectRole(action);
	if (role == QAction::NoRole)
		return 0; // Item should not appear in appmenu

	// If we just inserted a custom quit item, remove the default one.
	if (role == QAction::QuitRole) {
		removeAction(m_def_quit);
	}

	uint order = orderForRole(role);
	QMap<uint, QAction*>::iterator it = m_actions.insert(order, action);

	// Get the previous element
	QAction *before = 0;
	if (it != m_actions.begin()) {
		--it;
		before = it.value();
	}

	return MenuProxy::addAction(action, before, 0);
}

GtkMenuItem * AppMenu::addAction(QAction* action, QAction* before, QMenu* parent)
{
	if (parent) {
		return MenuProxy::addAction(action, before, parent);
	} else {
		// Never add an action to the root menu here.
		return 0;
	}
}

void AppMenu::removeAction(QAction *action)
{
	if (getItemForAction(action)) {
		MenuProxy::removeAction(action);
		m_actions.remove(orderForRole(action->menuRole()), action);
	}
}

void AppMenu::updateAction(QAction *action)
{
	GtkMenuItem *item = getItemForAction(action);

	if (item) {
		MenuProxy::updateAction(action);
	} else {
		QAction::MenuRole role = detectRole(action);
		if (role != QAction::NoRole) {
			// The item now has a role!
			addAction(action);
		}
	}
}

void AppMenu::addDefaultItems()
{
	QAction *separator = new QAction(this);
	separator->setSeparator(true);
	m_actions.insert(15, separator);
	MenuProxy::addAction(separator, 0, 0);

	m_def_quit = new QAction(QIcon::fromTheme("application-exit"),
	                         QMenuBar::tr("Quit"), this);
	m_actions.insert(11, m_def_quit);
	MenuProxy::addAction(m_def_quit, 0, 0);

	connect(m_def_quit, SIGNAL(triggered()),
	        QCoreApplication::instance(), SLOT(quit()));
}

uint AppMenu::orderForRole(QAction::MenuRole role)
{
	switch (role) {
	case QAction::AboutRole:
		return 50;
	case QAction::AboutQtRole:
		return 40;
	case QAction::PreferencesRole:
		return 30;
	case QAction::ApplicationSpecificRole:
		return 20;
	case QAction::QuitRole:
		return 10;
	default:
		return 0;
	}
}

QAction::MenuRole AppMenu::detectRole(QAction *action)
{
	QAction::MenuRole role = action->menuRole();

	if (action->isSeparator()) return QAction::NoRole;

	if (role == QAction::TextHeuristicRole) {
		QString t = action->text().toLower().remove('&');

		QString aboutString = QMenuBar::tr("About").toLower();
        if (t.startsWith(aboutString) || t.endsWith(aboutString)) {
            if (t.indexOf(QRegExp(QString::fromLatin1("qt$"), Qt::CaseInsensitive)) == -1) {
				return QAction::AboutRole;
            } else {
				return QAction::AboutQtRole;
            }
        } else if (t.startsWith(QMenuBar::tr("Config").toLower())
                   || t.startsWith(QMenuBar::tr("Preference").toLower())
                   || t.startsWith(QMenuBar::tr("Options").toLower())
                   || t.startsWith(QMenuBar::tr("Setting").toLower())
                   || t.startsWith(QMenuBar::tr("Setup").toLower())) {
			return QAction::PreferencesRole;
        } else if (t.startsWith(QMenuBar::tr("Quit").toLower())
                   || t.startsWith(QMenuBar::tr("Exit").toLower())) {
			return QAction::QuitRole;
        }

		return QAction::NoRole;
	} else {
		return role;
	}
}