/*
 * Copyright 2014  Martin Gräßlin <mgraesslin@kde.org>
 *
 * 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) version 3 or any later version
 * accepted by the membership of KDE e.V. (or its successor approved
 * by the membership of KDE e.V.), which shall act as a proxy
 * defined in Section 14 of version 3 of the license.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#include "buttonsmodel.h"

#include <KLocalizedString>

#include <QFontDatabase>

namespace KDecoration2
{

namespace Preview
{

ButtonsModel::ButtonsModel(const QVector< DecorationButtonType > &buttons, QObject *parent)
    : QAbstractListModel(parent)
    , m_buttons(buttons)
{
}

ButtonsModel::ButtonsModel(QObject* parent)
    : ButtonsModel(QVector<DecorationButtonType>({
        DecorationButtonType::Menu,
        DecorationButtonType::OnAllDesktops,
        DecorationButtonType::Minimize,
        DecorationButtonType::Maximize,
        DecorationButtonType::Close,
        DecorationButtonType::ContextHelp,
        DecorationButtonType::Shade,
        DecorationButtonType::KeepBelow,
        DecorationButtonType::KeepAbove
    }), parent)
{
}

ButtonsModel::~ButtonsModel() = default;

int ButtonsModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid()) {
        return 0;
    }
    return m_buttons.count();
}

static QString buttonToName(DecorationButtonType type)
{
    switch (type) {
        case DecorationButtonType::Menu:
            return i18n("Menu");
        case DecorationButtonType::ApplicationMenu:
            return i18n("Application menu");
        case DecorationButtonType::OnAllDesktops:
            return i18n("On all desktops");
        case DecorationButtonType::Minimize:
            return i18n("Minimize");
        case DecorationButtonType::Maximize:
            return i18n("Maximize");
        case DecorationButtonType::Close:
            return i18n("Close");
        case DecorationButtonType::ContextHelp:
            return i18n("Context help");
        case DecorationButtonType::Shade:
            return i18n("Shade");
        case DecorationButtonType::KeepBelow:
            return i18n("Keep below");
        case DecorationButtonType::KeepAbove:
            return i18n("Keep above");
        default:
            return QString();
    }
}

QVariant ButtonsModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid() ||
            index.row() < 0 ||
            index.row() >= m_buttons.count() ||
            index.column() != 0) {
        return QVariant();
    }
    switch (role) {
    case Qt::DisplayRole:
        return buttonToName(m_buttons.at(index.row()));
    case Qt::UserRole:
        return QVariant::fromValue(int(m_buttons.at(index.row())));
    }
    return QVariant();
}

QHash< int, QByteArray > ButtonsModel::roleNames() const
{
    QHash<int, QByteArray> roles;
    roles.insert(Qt::DisplayRole, QByteArrayLiteral("display"));
    roles.insert(Qt::UserRole, QByteArrayLiteral("button"));
    return roles;
}

void ButtonsModel::remove(int row)
{
    if (row < 0 || row >= m_buttons.count()) {
        return;
    }
    beginRemoveRows(QModelIndex(), row, row);
    m_buttons.removeAt(row);
    endRemoveRows();
}

void ButtonsModel::down(int index)
{
    if (m_buttons.count() < 2 || index == m_buttons.count() -1) {
        return;
    }
    beginMoveRows(QModelIndex(), index, index, QModelIndex(), index + 2);
    m_buttons.insert(index +1, m_buttons.takeAt(index));
    endMoveRows();
}

void ButtonsModel::up(int index)
{
    if (m_buttons.count() < 2 || index == 0) {
        return;
    }
    beginMoveRows(QModelIndex(), index, index, QModelIndex(), index -1);
    m_buttons.insert(index -1, m_buttons.takeAt(index));
    endMoveRows();
}

void ButtonsModel::add(DecorationButtonType type)
{
    beginInsertRows(QModelIndex(), m_buttons.count(), m_buttons.count());
    m_buttons.append(type);
    endInsertRows();
}

void ButtonsModel::add(int index, int type)
{
    beginInsertRows(QModelIndex(), index + 1, index+1);
    m_buttons.insert(index+1, KDecoration2::DecorationButtonType(type));
    endInsertRows();
}

void ButtonsModel::move(int sourceIndex, int targetIndex)
{
    if (sourceIndex == qMax(0, targetIndex)) {
        return;
    }

    /* When moving an item down, the destination index needs to be incremented
       by one, as explained in the documentation:
       http://doc.qt.nokia.com/qabstractitemmodel.html#beginMoveRows */
    if (targetIndex > sourceIndex) {
        // Row will be moved down
        beginMoveRows(QModelIndex(), sourceIndex, sourceIndex, QModelIndex(), targetIndex + 1);
    } else {
        beginMoveRows(QModelIndex(), sourceIndex, sourceIndex, QModelIndex(), qMax(0, targetIndex));
    }

    m_buttons.move(sourceIndex, qMax(0, targetIndex));
    endMoveRows();
}

}
}