/*
  EventModelAdapter.cpp

  This file is part of Charm, a task-based time tracking application.

  Copyright (C) 2007-2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com

  Author: Mirko Boehm <mirko.boehm@kdab.com>
  Author: Frank Osterfeld <frank.osterfeld@kdab.com>

  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, see <http://www.gnu.org/licenses/>.
*/

#include "EventModelAdapter.h"
#include "ApplicationCore.h"

#include "Core/CharmCommand.h"
#include "Core/CharmDataModel.h"

EventModelAdapter::EventModelAdapter(CharmDataModel *parent)
    : QAbstractListModel(parent)
    , m_dataModel(parent)
{
    m_dataModel->registerAdapter(this);
}

EventModelAdapter::~EventModelAdapter()
{
    if (m_dataModel)
        m_dataModel->unregisterAdapter(this);
}

int EventModelAdapter::rowCount(const QModelIndex &) const
{
    return m_events.size();
}

QVariant EventModelAdapter::data(const QModelIndex &index, int role) const
{
    if (!index.isValid() || index.row() < 0 || index.row() > m_events.size())
        return QVariant(); // beware of stale persistent indexes

    switch (role) {
    case Qt::DisplayRole:
    {
        EventId eventId = m_events[index.row()];
        const Event &event = m_dataModel->eventForId(eventId);

        QString text;
        QTextStream stream(&text);
        stream << event.taskId() << " - " << event.comment();

        return text;
        break;
    }

    default:
        return QVariant();
    }
}

void EventModelAdapter::resetEvents()
{
    beginResetModel();

    m_events.clear();

    for (EventMap::const_iterator it = m_dataModel->eventMap().begin();
         it != m_dataModel->eventMap().end(); ++it)
        m_events.append(it->first);

    endResetModel();
}

void EventModelAdapter::eventAboutToBeAdded(EventId)
{
    int position = m_events.size();
    beginInsertRows(QModelIndex(), position, position);
}

void EventModelAdapter::eventAdded(EventId id)
{
    m_events.append(id);
    endInsertRows();
}

void EventModelAdapter::eventModified(EventId id, Event)
{
    // nothing to do, except:
    int row = m_events.indexOf(id);
    Q_ASSERT(row != -1);   // inconsistency between model and adapter
    emit(dataChanged(index(row), index(row)));
}

void EventModelAdapter::eventAboutToBeDeleted(EventId id)
{
    int row = m_events.indexOf(id);
    Q_ASSERT(row != -1);   // inconsistency between model and adapter
    beginRemoveRows(QModelIndex(), row, row);
}

void EventModelAdapter::eventDeleted(EventId id)
{
    int position = m_events.indexOf(id);
    Q_ASSERT(position != -1);   // inconsistency between model and adapter
    m_events.removeAt(position);
    Q_ASSERT(m_events.indexOf(id) == -1);      // cannot be in there
    endRemoveRows();
}

void EventModelAdapter::eventActivated(EventId id)
{
    emit eventActivationNotice(id);
}

void EventModelAdapter::eventDeactivated(EventId id)
{
    emit eventDeactivationNotice(id);
}

void EventModelAdapter::commitCommand(CharmCommand *command)
{
    command->finalize();
}

const Event &EventModelAdapter::eventForIndex(const QModelIndex &index) const
{
    if (index.row() >= 0 && index.row() < m_events.size()) {
        EventId eventId = m_events.at(index.row());
        const Event &event = m_dataModel->eventForId(eventId);
        return event;
    } else {
        static Event InvalidEvent;
        return InvalidEvent;
    }
}

QModelIndex EventModelAdapter::indexForEvent(const Event &event) const
{
    int position = m_events.indexOf(event.id());

    if (position >= 0 && position < m_events.size()) {
        return index(position);
    } else {
        return QModelIndex();
    }
}
