/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: tsmodel.cpp
*
*/
#include "tsmodel.h"

#include <QVariant>
#include <QList>

#include <HbIcon>

#include <afstorageglobals.h>

#ifdef Q_OS_SYMBIAN
#include <XQSettingsManager>
#include <apaid.h>

const int TSDeviceDialogUid = 0x2002677F;
const int ItemsLimit = 0x00000001;
#endif

#include "tsmodelitem.h"
#include "tsentrymodelitem.h"
#include "tsactivitymodelitem.h"
#include "tsdataroles.h"
#include "tstaskchangeinfo.h"

const int maxItems(10);
/*!
    \class TsModel
    \ingroup group_tsdevicedialogplugin
    \brief Model storing running application and activieties.
*/

/*!
    Constructor
    \param query used to create model
    \param pointer to parent object
*/
TsModel::TsModel(TsTaskMonitor &applicationSrv, 
                 QObject &activitySrv, 
                 QObject *parent) :
    QAbstractListModel(parent),
    mEntries(),
    mApplicationService(applicationSrv),
    mActivityService(activitySrv),
    mMaxItems(maxItems)
{
    
#ifdef Q_OS_SYMBIAN
    XQSettingsManager *crManager = new XQSettingsManager;
    XQCentralRepositorySettingsKey itemsNumberKey(TSDeviceDialogUid, ItemsLimit);
    QVariant itemsNumberVariant = 
        crManager->readItemValue(itemsNumberKey, XQSettingsManager::TypeInt);
    if (!itemsNumberVariant.isNull()) {
        int number = itemsNumberVariant.toInt();
        if (number > 0) {
            mMaxItems = number;
        }
    }
    iAppArcSession.Connect();
#endif

    connect(&activitySrv,
	SIGNAL(dataChanged()),
			 this,
			 SLOT(updateActivities()));
    connect(&applicationSrv,
	        SIGNAL(taskListChanged()),
			this,
			SLOT(updateApplications()));

    fullUpdate();    
}

/*!
    Destructor
*/
TsModel::~TsModel()
{
#ifdef Q_OS_SYMBIAN
    iAppArcSession.Close();
#endif
    qDeleteAll(mEntries);
}

/*!
    Returns count of rows in model
    \retval number of rows
*/
int TsModel::rowCount(
    const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    return mEntries.count();
}

bool TsModel::insertRows(int row, int count, TsModelItem* item, const QModelIndex & parent)
{
    beginInsertRows(parent, row, row+count-1);
    mEntries.insert(row, item);
    endInsertRows();
    return true;
}

bool TsModel::removeRows(int row, int count, const QModelIndex & parent)
{
    beginRemoveRows(parent, row, row + count - 1);
    mEntries.removeAt(row);
    endRemoveRows();
    return true;
}


bool TsModel::moveRows(int oldPosition, int newPosition, const QModelIndex & parent)
{
   beginMoveRows(parent, oldPosition, oldPosition, parent, newPosition);
   mEntries.move(oldPosition, newPosition);
   endMoveRows();
   return true;
}


bool TsModel::updateRows(int row, TsModelItem* item)
{
    TsModelItem *oldItem = mEntries.at(row);
    mEntries[row] = item;
    delete oldItem;

    emit dataChanged(index(row),index(row));
    return true;
}

/*!
    Returns appropiate model's data
    \param index model index
    \param role which data role to return
    \retval models data
*/
QVariant TsModel::data(const QModelIndex &index,
                       int role) const
{
    return index.isValid() ? entry(index)->data(role) : QVariant();
}

/*!
    Returns maximum anount of data allowed for model
    \retval maximum data count
*/

int TsModel::maxRowCount()const
{
    return mMaxItems;
}

/*!
    Activate one of model entries
*/
void TsModel::openApplication(const QModelIndex &index)
{
    if (!index.isValid()) {
        return;
    }
    entry(index)->open();
}

/*!
    Close one of moder entries
*/
void TsModel::closeApplication(const QModelIndex &index)
{
    if (!index.isValid() || 
        !entry(index)->data(TsDataRoles::Closable).toBool()) {
        return;
    }
    entry(index)->close();
}

/*!
    Updates model with fresh entries
*/
void TsModel::updateApplications()
{
    RDebug::Printf( "TsModel::updateApps \n");
    RDebug::Printf(" from %d \n: ",this);
    QList<TsTaskChange>  changes(mApplicationService.changeList());
    
    if(changes.count() == 0)
    {
        //no applications - only activities on list
        return;
    }
    //check 1st item whether we have cancel change - if so reset model
    if (changes[0].first.changeType() == TsTaskChangeInfo::EChangeCancel) {
        fullUpdate();
        return;
    }
    for (int iter(0); iter < changes.count(); iter++) {
        switch (changes[iter].first.changeType()) {
            case TsTaskChangeInfo::EChangeDelete :
                removeRows(changes[iter].first.oldOffset(), 1);
            break;
            case TsTaskChangeInfo::EChangeInsert :
                insertRows(changes[iter].first.newOffset(), 1,
                    new TsEntryModelItem(changes[iter].second));
            break;
            case TsTaskChangeInfo::EChangeMove :
                moveRows(changes[iter].first.oldOffset(), changes[iter].first.newOffset());
            break;            
            case TsTaskChangeInfo::EChangeUpdate :
                updateRows(changes[iter].first.oldOffset(),
                           new TsEntryModelItem(changes[iter].second));
            break;
            default:
            break;
        }
    }

    //because delete entries are at end of changelist - iterate backwards

}

/*!
    Updates model with fresh entries
*/
void TsModel::updateActivities()
{
    //as for now we need full update when activities change
    fullUpdate();
}

/*!
    reset model using full application and activities lists
*/
void TsModel::fullUpdate()
{
    qDeleteAll(mEntries);
    mEntries.clear();
    getApplications();
    getActivities();
    endResetModel();

}

/*!
    Read list of running applications
*/
void TsModel::getApplications()
{
    RDebug::Printf( "CTsTaskMonitorClientImpl::RunL \n");
    //get all running applications and append to entries list
    TsModelItem *entry(0);
    QList< TsTaskChange> tasks(mApplicationService.changeList(true));
    foreach (TsTaskChange taskData, tasks) {
        if (!taskData.second.isNull()) {
            entry = new TsEntryModelItem(taskData.second);
            if (entry) {
                mEntries.append(entry);
            }
        }
    }
}

/*!
    Read current activities
*/
void TsModel::getActivities()
{
    //get activities
    TsModelItem *entry(0);
    QList<QVariantHash> activities;
    QMetaObject::invokeMethod(&mActivityService, 
                              "activitiesList", 
                              Q_RETURN_ARG(QList<QVariantHash>, 
                              activities));
    foreach(QVariantHash activity, activities) {
        prepareActivityEntry(activity);
        entry = new TsActivityModelItem(*this, mActivityService, activity);
        if (maxRowCount() <= mEntries.count()) {
            delete entry;
            break;
        }
        mEntries.append(entry);
    }
}

/*!
    Modify activity entry replacing application id with name
*/
void TsModel::prepareActivityEntry(QVariantHash &activity)
{
    if (!activity.contains(TsActivityModelItem::applicationKeyword())) {
        activity.insert(TsActivityModelItem::applicationKeyword(),
                    activity.contains(ActivityApplicationKeyword) ?
                    getApplicationName(activity[ActivityApplicationKeyword].toInt()) :
                    QString::null);
    }
}

/*!
    Return application name
    \param id - reqiested application identyfier
*/
QString TsModel::getApplicationName(int id)
{
    QString retVal;
#ifdef Q_OS_SYMBIAN
    TApaAppInfo info;
    iAppArcSession.GetAppInfo( info, TUid::Uid(id));
    retVal = QString::fromUtf16(info.iShortCaption.Ptr(),
                                info.iShortCaption.Length());
#endif
    return retVal;
}

/*!
    Called when some item was changed
    \param itemPtr - address of updated item
*/
void TsModel::entryChanged(TsModelItem *itemPtr)
{
    const int itemIndex = mEntries.indexOf(itemPtr);
    if (itemIndex != -1) {
        emit dataChanged(index(itemIndex, 0), index(itemIndex, 0));
    }
}

/*!
    Returns an entry from model
    \param index of entry in model
    \retval pointer to an entry
*/
TsModelItem *TsModel::entry(const QModelIndex &index) const
{
    return mEntries.at(index.row());
}