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/***************************************************************************
 *   Copyright (C) 2015 by Eike Hein <hein@kde.org>                        *
 *   Copyright (C) 2017 by Ivan Cukic <ivan.cukic@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) any later version.                                   *
 *                                                                         *
 *   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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
 ***************************************************************************/

#include "placeholdermodel.h"
#include "actionlist.h"
#include "debug.h"

#include <QTimer>

PlaceholderModel::PlaceholderModel(QObject *parent)
    : AbstractModel(parent)
    , m_dropPlaceholderIndex(-1)
    , m_isTriggerInhibited(false)
{
    connect(&m_triggerInhibitor, &QTimer::timeout,
            this, [&] {
                qCDebug(KICKER_DEBUG) << "%%% Inhibit stopped";
                m_isTriggerInhibited = false;
            });

    m_triggerInhibitor.setInterval(500);
    m_triggerInhibitor.setSingleShot(true);
}

void PlaceholderModel::inhibitTriggering()
{
    qCDebug(KICKER_DEBUG) << "%%% Inhibit started";
    m_isTriggerInhibited = true;
    m_triggerInhibitor.start();
}

PlaceholderModel::~PlaceholderModel()
{
}

QString PlaceholderModel::description() const
{
    if (auto abstractModel = qobject_cast<AbstractModel *>(m_sourceModel)) {
        return abstractModel->description();

    } else {
        return QString();
    }
}

QAbstractItemModel *PlaceholderModel::sourceModel() const
{
    return m_sourceModel;
}

void PlaceholderModel::setSourceModel(QAbstractItemModel *sourceModel)
{
    disconnectSignals();

    beginResetModel();

    m_sourceModel = sourceModel;

    connectSignals();

    endResetModel();

    emit countChanged();
    emit sourceModelChanged();
    emit descriptionChanged();
}

bool PlaceholderModel::canFetchMore(const QModelIndex &parent) const
{
    return m_sourceModel && m_sourceModel->canFetchMore(indexToSourceIndex(parent));
}

void PlaceholderModel::fetchMore(const QModelIndex &parent)
{
    if (m_sourceModel) {
        m_sourceModel->fetchMore(indexToSourceIndex(parent));
    }
}

QModelIndex PlaceholderModel::index(int row, int column, const QModelIndex &parent) const
{
    Q_UNUSED(parent)

    return m_sourceModel ? createIndex(row, column)
                         : QModelIndex();
}

QModelIndex PlaceholderModel::parent(const QModelIndex &index) const
{
    Q_UNUSED(index)

    return QModelIndex();
}

QVariant PlaceholderModel::data(const QModelIndex &index, int role) const
{
    const auto row = index.row();

    if (m_dropPlaceholderIndex == row) {
        switch (role) {
            case Kicker::IsDropPlaceholderRole:
                return true;

            // TODO: Maybe it would be nice to show something here?
            // case Qt::DisplayRole:
            //     return "placeholder";
            //
            // case Qt::DecorationRole:
            //     return "select";

            default:
                return QVariant();

        }
    }

    return m_sourceModel ? m_sourceModel->data(indexToSourceIndex(index), role)
                         : QVariant();
}

int PlaceholderModel::rowCount(const QModelIndex &parent) const
{
    if (!m_sourceModel || parent.isValid()) {
        return 0;
    }

    return m_sourceModel->rowCount()
                + (m_dropPlaceholderIndex != -1 ? 1 : 0);
}

QModelIndex PlaceholderModel::indexToSourceIndex(const QModelIndex& index) const
{
    if (!m_sourceModel || !index.isValid()) {
        return QModelIndex();
    }

    const auto row = index.row();
    const auto column = index.column();

    return index.parent().isValid() ?
        // We do not support tree models
        QModelIndex() :

        // If we are on top-level, lets add a placeholder
        m_sourceModel->index(
                row - (m_dropPlaceholderIndex != -1 && row > m_dropPlaceholderIndex ? 1 : 0),
                column,
                QModelIndex()
            );
}

int PlaceholderModel::sourceRowToRow(int sourceRow) const
{
    return sourceRow +
        (m_dropPlaceholderIndex != -1 && sourceRow >= m_dropPlaceholderIndex ? 1 : 0);
}

int PlaceholderModel::rowToSourceRow(int row) const
{
    return row == m_dropPlaceholderIndex ? -1 :
           row - (m_dropPlaceholderIndex != -1 && row > m_dropPlaceholderIndex ? 1 : 0);
}

QModelIndex PlaceholderModel::sourceIndexToIndex(const QModelIndex& sourceIndex) const
{
    if (!m_sourceModel || !sourceIndex.isValid()) {
        return QModelIndex();
    }

    const auto sourceRow = sourceIndex.row();
    const auto sourceColumn = sourceIndex.column();

    return sourceIndex.parent().isValid() ?
        // We do not support tree-models
        QModelIndex() :

        // If we are on top-level, lets add a placeholder
        index(
                sourceRowToRow(sourceRow),
                sourceColumn,
                QModelIndex()
            );
}

bool PlaceholderModel::trigger(int row, const QString &actionId, const QVariant &argument)
{
    if (m_isTriggerInhibited) return false;

    if (auto abstractModel = qobject_cast<AbstractModel *>(m_sourceModel)) {
        return abstractModel->trigger(rowToSourceRow(row), actionId, argument);

    } else {
        return false;
    }
}

QString PlaceholderModel::labelForRow(int row)
{
    if (auto abstractModel = qobject_cast<AbstractModel *>(m_sourceModel)) {
        return abstractModel->labelForRow(rowToSourceRow(row));

    } else {
        return QString();
    }

}

AbstractModel* PlaceholderModel::modelForRow(int row)
{
    if (auto abstractModel = qobject_cast<AbstractModel *>(m_sourceModel)) {
        return abstractModel->modelForRow(rowToSourceRow(row));

    } else {
        return 0;
    }
}

AbstractModel* PlaceholderModel::favoritesModel()
{
    if (auto abstractModel = qobject_cast<AbstractModel *>(m_sourceModel)) {
        return abstractModel->favoritesModel();

    } else {
        return AbstractModel::favoritesModel();
    }
}

int PlaceholderModel::separatorCount() const
{
    if (auto abstractModel = qobject_cast<AbstractModel *>(m_sourceModel)) {
        return abstractModel->separatorCount();

    } else {
        return 0;
    }
}

void PlaceholderModel::reset()
{
    emit beginResetModel();
    emit endResetModel();
    emit countChanged();
    emit separatorCountChanged();
}

void PlaceholderModel::connectSignals()
{
    if (!m_sourceModel) {
        return;
    }

    const auto sourceModelPtr = m_sourceModel.data();

    connect(sourceModelPtr, SIGNAL(destroyed()), this, SLOT(reset()));

    connect(sourceModelPtr, &QAbstractItemModel::dataChanged,
            this, [this] (const QModelIndex &from, const QModelIndex &to, const QVector<int> &roles) {
                emit dataChanged(sourceIndexToIndex(from),
                                 sourceIndexToIndex(to),
                                 roles);
            });

    connect(sourceModelPtr, &QAbstractItemModel::rowsAboutToBeInserted,
            this, [this] (const QModelIndex &parent, int from, int to) {
                if (parent.isValid()) {
                    qWarning() << "We do not support tree models";

                } else {
                    beginInsertRows(QModelIndex(),
                                    sourceRowToRow(from),
                                    sourceRowToRow(to));

                }
            });

    connect(sourceModelPtr, &QAbstractItemModel::rowsInserted,
            this, [this] {
                endInsertRows();
                emit countChanged();
            });


    connect(sourceModelPtr, &QAbstractItemModel::rowsAboutToBeMoved,
            this, [this] (const QModelIndex &source, int from, int to, const QModelIndex &dest, int destRow) {
                if (source.isValid() || dest.isValid()) {
                    qWarning() << "We do not support tree models";

                } else {
                    beginMoveRows(QModelIndex(),
                                  sourceRowToRow(from),
                                  sourceRowToRow(to),
                                  QModelIndex(),
                                  sourceRowToRow(destRow));
                }
            });

    connect(sourceModelPtr, &QAbstractItemModel::rowsMoved,
            this, [this] {
                endMoveRows();
            });


    connect(sourceModelPtr, &QAbstractItemModel::rowsAboutToBeRemoved,
            this, [this] (const QModelIndex &parent, int from, int to) {
                if (parent.isValid()) {
                    qWarning() << "We do not support tree models";

                } else {
                    beginRemoveRows(QModelIndex(),
                                    sourceRowToRow(from),
                                    sourceRowToRow(to));
                }
            });

    connect(sourceModelPtr, &QAbstractItemModel::rowsRemoved,
            this, [this] {
                endRemoveRows();
                emit countChanged();
            });


    connect(sourceModelPtr, &QAbstractItemModel::modelAboutToBeReset,
            this, [this] {
                beginResetModel();
            });

    connect(sourceModelPtr, &QAbstractItemModel::modelReset,
            this, [this] {
                endResetModel();
                emit countChanged();
            });

    // We do not have persistant indices
    // connect(sourceModelPtr, &QAbstractItemModel::layoutAboutToBeChanged),
    //         this, &PlaceholderModel::layoutAboutToBeChanged);
    // connect(sourceModelPtr, &QAbstractItemModel::layoutChanged),
    //         this, SIGNAL(layoutChanged(QList<QPersistentModelIndex>,QAbstractItemModel::LayoutChangeHint)),
    //         Qt::UniqueConnection);
}

void PlaceholderModel::disconnectSignals()
{
    if (!m_sourceModel) {
        return;
    }

    disconnect(m_sourceModel, 0, this, 0);
}

int PlaceholderModel::dropPlaceholderIndex() const
{
    return m_dropPlaceholderIndex;
}

void PlaceholderModel::setDropPlaceholderIndex(int index)
{
    if (index == m_dropPlaceholderIndex) return;

    inhibitTriggering();

    if (index == -1 && m_dropPlaceholderIndex != -1) {
        // Removing the placeholder
        beginRemoveRows(QModelIndex(), m_dropPlaceholderIndex, m_dropPlaceholderIndex);
        m_dropPlaceholderIndex = index;
        endRemoveRows();

        emit countChanged();

    } else if (index != -1 && m_dropPlaceholderIndex == -1) {
        // Creating the placeholder
        beginInsertRows(QModelIndex(), index, index);
        m_dropPlaceholderIndex = index;
        endInsertRows();

        emit countChanged();

    } else if (m_dropPlaceholderIndex != index) {
        // Moving the placeholder
        int modelTo = index + (index > m_dropPlaceholderIndex ? 1 : 0);

        if (beginMoveRows(
                    QModelIndex(), m_dropPlaceholderIndex, m_dropPlaceholderIndex,
                    QModelIndex(), modelTo)) {
            m_dropPlaceholderIndex = index;
            endMoveRows();
        }
    }

    emit dropPlaceholderIndexChanged();
}