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//system includes

#include <e32base.h>

#include <s32mem.h>

#include <cntitem.h>

//user includes

#include "cntsymbiandatabase.h"

#include "cntsymbiantransformerror.h"

#include "qcontactchangeset.h"

#include "qcontactmanagerengine.h"

// Constant

typedef QPair<QContactLocalId, QContactLocalId> QOwnCardPair;

CntSymbianDatabase::CntSymbianDatabase(QContactManagerEngine *engine, QContactManager::Error* error) :

    m_engine(engine),

    m_contactDatabase(0),

    m_currentOwnCardId(0)

{

    TRAPD(err, initializeL());

    CntSymbianTransformError::transformError(err, error);

}

void CntSymbianDatabase::initializeL()

{

    User::LeaveIfNull(m_engine);

    TRAPD(err, m_contactDatabase = CContactDatabase::OpenL());

    // Database not found, create it

    if(err == KErrNotFound) {

        m_contactDatabase = CContactDatabase::CreateL();

    }

#ifndef SYMBIAN_BACKEND_USE_SQLITE

    // In pre 10.1 platforms the AddObserverL & RemoveObserver functions are not

    // exported so we need to use CContactChangeNotifier.

    TRAP(err, m_contactChangeNotifier = CContactChangeNotifier::NewL(*m_contactDatabase, this));

#else

    TRAP(err, m_contactDatabase->AddObserverL(*this));

#endif

    // Read current own card id (self contact id)

    TContactItemId myCard = m_contactDatabase->OwnCardId();

    if (myCard > 0)

        m_currentOwnCardId = QContactLocalId(myCard);

    // Currently the group membership check is only used in pre-10.1

    // platforms. In 10.1 we need to check the performance penalty

    // caused in the instantiation of QContactManager. If the

    // performance is too bad, then the MContactDbObserver API needs to

    // be changed in 10.1 so that we don't need the group membership

    // buffer in the engine level. In other words events like

    // EContactDbObserverEventGroupMembersAdded and 

    // EContactDbObserverEventGroupMembersRemoved need to be added to

    // MContactDbObserver.

#ifndef SYMBIAN_BACKEND_USE_SQLITE

    updateGroupMembershipsL();

#endif

}

CntSymbianDatabase::~CntSymbianDatabase()

{

    m_engine = NULL;

#ifndef SYMBIAN_BACKEND_USE_SQLITE

    delete m_contactChangeNotifier;

#else

    if (m_contactDatabase != 0) {

        m_contactDatabase->RemoveObserver(*this);

    }

#endif

    delete m_contactDatabase;

}

CContactDatabase* CntSymbianDatabase::contactDatabase()

{

    return m_contactDatabase;

}

void CntSymbianDatabase::appendContactsEmitted(const QList<QContactLocalId> &contactList)

{

    m_contactsEmitted += contactList;

}

void CntSymbianDatabase::appendContactEmitted(QContactLocalId id)

{

    m_contactsEmitted.append(id);

}

/*!

 * Respond to a contacts database event, delegating this event to

 * an appropriate signal as required.

 *

 * \param aEvent Contacts database event describing the change to the

 *  database.

 */

void CntSymbianDatabase::HandleDatabaseEventL(TContactDbObserverEvent aEvent)

{

    QContactChangeSet changeSet;

    TContactItemId id = aEvent.iContactId;

    switch (aEvent.iType)

    {

    case EContactDbObserverEventContactAdded:

        if(m_contactsEmitted.contains(id))

            m_contactsEmitted.removeOne(id);

        else

            changeSet.insertAddedContact(id);

        break;

    case EContactDbObserverEventOwnCardDeleted:

        m_currentOwnCardId = QContactLocalId(0);

    case EContactDbObserverEventContactDeleted:

        if(m_contactsEmitted.contains(id))

            m_contactsEmitted.removeOne(id);

        else

            changeSet.insertRemovedContact(id);

        break;

    case EContactDbObserverEventContactChanged:

        if(m_contactsEmitted.contains(id))

            m_contactsEmitted.removeOne(id);

        else

            changeSet.insertChangedContact(id);

        break;

    case EContactDbObserverEventGroupAdded:

        if(m_contactsEmitted.contains(id)) {

            // adding a group triggers also a "changed" event. The work-around

            // is to leave the id to m_contactsEmitted

        } else {

            changeSet.insertAddedContact(id);

            m_contactsEmitted.append(id);

        }

        break;

    case EContactDbObserverEventGroupDeleted:

        if(m_contactsEmitted.contains(id))

            m_contactsEmitted.removeOne(id);

        else

            changeSet.insertRemovedContact(id);

        break;

    case EContactDbObserverEventGroupChanged:

        if(m_contactsEmitted.contains(id))

            m_contactsEmitted.removeOne(id);

        else {

#ifndef SYMBIAN_BACKEND_USE_SQLITE

            // Contact DB observer API does not give information of contacts

            // possibly added to or removed from the group

            QSet<QContactLocalId> added;

            QSet<QContactLocalId> removed;

            TRAPD(err, updateGroupMembershipsL(id, added, removed));

            if(err != KErrNone){

                changeSet.setDataChanged(true);

            } else if(removed.count()) {

                // The group changed event was caused by removing contacts

                // from the group

                changeSet.insertRemovedRelationshipsContact(id);

                changeSet.insertRemovedRelationshipsContacts(removed.toList());

            } else if(added.count()) {

                // The group changed event was caused by adding contacts

                // to the group

                changeSet.insertAddedRelationshipsContact(id);

                changeSet.insertAddedRelationshipsContacts(added.toList());

            } else {

                // The group changed event was caused by modifying the group

                changeSet.insertChangedContact(id);

            }

#else

            // Currently the group membership check is only used in pre-10.1

            // platforms. In 10.1 we need to check the performance penalty

            // caused in the instantiation of QContactManager. If the

            // performance is too bad, then the MContactDbObserver API needs to

            // be changed in 10.1 so that we don't need the group membership

            // buffer in the engine level. In other words events like

            // EContactDbObserverEventGroupMembersAdded and 

            // EContactDbObserverEventGroupMembersRemoved need to be added to

            // MContactDbObserver.

            changeSet.insertChangedContact(id); //group is a contact

#endif

        }

        break;

    case EContactDbObserverEventOwnCardChanged:

            m_contactsEmitted.removeOne(id);

            QOwnCardPair ownCard(m_currentOwnCardId, QContactLocalId(id));

            changeSet.setOldAndNewSelfContactId(ownCard);

            m_currentOwnCardId = QContactLocalId(id);

        }

        break;

    default:

        break; // ignore other events

    }

    changeSet.emitSignals(m_engine);

}

/*

 * Private implementation for updating the buffer containing the members of all

 * groups.

 */

void CntSymbianDatabase::updateGroupMembershipsL()

{

    CContactIdArray *groupIds = m_contactDatabase->GetGroupIdListL();

    for (TInt i(0); i < groupIds->Count(); ++i) {

        QContactLocalId id = (*groupIds)[i];

        QSet<QContactLocalId> dummySet;

        updateGroupMembershipsL(id, dummySet, dummySet);

    }

    delete groupIds;

}

/*

 * Private implementation for updating the buffer containing the members of a

 * group.

 */

void CntSymbianDatabase::updateGroupMembershipsL(

    QContactLocalId groupId,

    QSet<QContactLocalId> &added,

    QSet<QContactLocalId> &removed)

{

    QSet<QContactLocalId> groupMembersNew = groupMembersL(groupId);

    QSet<QContactLocalId> groupMembersOld = m_groupContents.value(groupId);

    if(groupMembersOld.count() < groupMembersNew.count()) {

        added = groupMembersNew - groupMembersOld;

        m_groupContents.remove(groupId);

        m_groupContents.insert(groupId, groupMembersNew);

    } else if(groupMembersOld.count() > groupMembersNew.count()) {

        removed = groupMembersOld - groupMembersNew;

        m_groupContents.remove(groupId);

        m_groupContents.insert(groupId, groupMembersNew);

    }

}

/*

 * Private implementation for fetching the members of a group.

 */

QSet<QContactLocalId> CntSymbianDatabase::groupMembersL(QContactLocalId groupId)

{

    QSet<QContactLocalId> groupMembers;

    CContactItem *contactItem = m_contactDatabase->ReadContactLC(TContactItemId(groupId));

    Q_ASSERT(contactItem && contactItem->Type() == KUidContactGroup);

    CContactGroup *group = static_cast<CContactGroup*>(contactItem);

    const CContactIdArray *idArray = group->ItemsContained();

    //loop through all the contacts and add them to the list

    for (int i(0); i < idArray->Count(); i++) {

        groupMembers.insert((*idArray)[i]);

    }

    CleanupStack::PopAndDestroy(contactItem);

    return groupMembers;

}