/*
 *  Copyright 2013  Andreas Cord-Landwehr <cordlandwehr@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 "profilemodel.h"
#include "liblearnerprofile/src/profilemanager.h"
#include "liblearnerprofile/src/learner.h"

#include <QAbstractListModel>
#include <QSignalMapper>

#include <KLocale>
#include <KDebug>

using namespace LearnerProfile;

ProfileModel::ProfileModel(QObject *parent)
    : QAbstractListModel(parent)
    , m_profileManager(0)
    , m_signalMapper(new QSignalMapper(this))
{
    QHash<int, QByteArray> roles;
    roles[IdRole] = "id";
    roles[NameRole] = "name";
    roles[DataRole] = "dataRole";
    setRoleNames(roles);

    connect(m_signalMapper, SIGNAL(mapped(int)), SLOT(emitProfileChanged(int)));
}

void ProfileModel::setProfileManager(ProfileManager *profileManager)
{
    if (m_profileManager == profileManager) {
        return;
    }

    beginResetModel();

    if (m_profileManager) {
        m_profileManager->disconnect(this);
        foreach (Learner *learner, m_profileManager->profiles()) {
            learner->disconnect(this);
        }
    }

    m_profileManager = profileManager;
    if (m_profileManager) {
        // initial setting of signal mappings
        connect(m_profileManager, SIGNAL(profileAdded(Learner*,int)), SLOT(onProfileAdded(Learner*,int)));
        connect(m_profileManager, SIGNAL(profileAboutToBeRemoved(int)), SLOT(onProfilesAboutToBeRemoved(int)));

        // insert and connect all already existing profiles
        int profiles = m_profileManager->profiles().count();
        for (int i = 0; i < profiles; ++i) {
            onProfileAdded(m_profileManager->profiles().at(i), i);
        }
        updateMappings();
    }
    endResetModel();
}

ProfileManager * ProfileModel::profileManager() const
{
    return m_profileManager;
}

QVariant ProfileModel::data(const QModelIndex &index, int role) const
{
    Q_ASSERT(m_profileManager);

    if (!index.isValid()) {
        return QVariant();
    }

    if (index.row() >= m_profileManager->profiles().count()) {
        return QVariant();
    }

    Learner * const learner = m_profileManager->profiles().at(index.row());

    switch(role)
    {
    case Qt::DisplayRole:
        return !learner->name().isEmpty()?
                QVariant(learner->name()): QVariant(i18nc("@item:inlistbox:", "unknown"));
    case Qt::ToolTipRole:
        return QVariant(learner->name());
    case IdRole:
        return learner->identifier();
    case NameRole:
        return learner->name();
    case DataRole:
        return QVariant::fromValue<QObject*>(learner);
    default:
        return QVariant();
    }
}

int ProfileModel::rowCount(const QModelIndex &parent) const
{
    if (!m_profileManager) {
        return 0;
    }

    if (parent.isValid()) {
        return 0;
    }
    return m_profileManager->profiles().count();
}

void ProfileModel::onProfileAdded(Learner *learner, int index)
{
    connect(learner, SIGNAL(nameChanged()), m_signalMapper, SLOT(map()));
    connect(learner, SIGNAL(identifierChanged()), m_signalMapper, SLOT(map()));
    beginInsertRows(QModelIndex(), index, index);
    updateMappings();
    endInsertRows();
}

void ProfileModel::onProfileAboutToBeRemoved(int index)
{
    beginRemoveRows(QModelIndex(), index, index);
    endRemoveRows();
}

void ProfileModel::emitProfileChanged(int row)
{
    reset(); //FIXME very inefficient, but workaround to force new filtering in phrasefiltermodel
             //      to exclude possible new excluded phrases
    emit profileChanged(row);
    emit dataChanged(index(row, 0), index(row, 0));
}

QVariant ProfileModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (role != Qt::DisplayRole) {
        return QVariant();
    }
    if (orientation == Qt::Vertical) {
        return QVariant(section + 1);
    }
    return QVariant(i18nc("@title:column", "Profile"));
}

void ProfileModel::updateMappings()
{
    if (!m_profileManager) {
        return;
    }
    int profiles = m_profileManager->profiles().count();
    for (int i = 0; i < profiles; ++i) {
        m_signalMapper->setMapping(m_profileManager->profiles().at(i), i);
    }
}
