/*

* 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:

*

*/

#include "nmuiengineheaders.h"

/*!

    \class NmUiEngine

    \brief NmUiEngine provides a controller-type services for the email UI.

*/

NmUiEngine *NmUiEngine::mInstance;

int NmUiEngine::mReferenceCount;

/*!

    Constructor

*/

NmUiEngine::NmUiEngine() 

:mMailboxListModel(NULL),

mMessageListModel(NULL),

{

    mPluginFactory = NmDataPluginFactory::instance();

    mDataManager = new NmDataManager();

}

/*!

    Destructor

*/

NmUiEngine::~NmUiEngine()

{

    if (mMessageListModel) {

        delete mMessageListModel;

        mMessageListModel = NULL;

    }

    if (mMailboxListModel) {

        delete mMailboxListModel;

        mMailboxListModel = NULL;

    }

    NmDataPluginFactory::releaseInstance(mPluginFactory);

    delete mDataManager;

    while (!mOperations.isEmpty()) {

        delete mOperations.takeLast();

    }

    delete mSendOperation;

}

/*!

*/

NmUiEngine *NmUiEngine::instance()

{

    if (!mInstance) {

    	mInstance = new NmUiEngine();

    }

    mReferenceCount++;

    return mInstance;

}

/*!

*/

void NmUiEngine::releaseInstance(NmUiEngine *&instance)

{

    //can't have passed out instances if we don't have any

    if (mInstance) {

        if(instance == mInstance) {

            instance = NULL;

            mReferenceCount--;

        }

        if (0 >= mReferenceCount) {

            delete mInstance;

            mInstance = NULL;

        }

    }

}

/*!

    Returns a list model populated with the mailbox and top level folder objects. The model is

    updated dynamically. The ownership of the model object is not moved to the caller.

*/

NmMailboxListModel &NmUiEngine::mailboxListModel()

{

    if (!mMailboxListModel) {

        refreshMailboxListModel(); // creates the model too

    }

    return *mMailboxListModel;

}

/*!

    Populate the list model with the mailbox and top level folder objects. The model is

    updated dynamically. Creates the model if needed.

*/

void NmUiEngine::refreshMailboxListModel()

{

    if (!mMailboxListModel) {

        mMailboxListModel = new NmMailboxListModel(*mDataManager);

        // Connect the model to the plugins to receive change notifications

        QList<QObject*> *dataPlugins = mPluginFactory->pluginInstances();

        for (int i = 0; i < dataPlugins->count(); i++) {

            QObject *plugin = (*dataPlugins)[i];

            if (plugin) {

                connect(plugin, SIGNAL(mailboxEvent(NmMailboxEvent, const QList<NmId> &)),

                    mMailboxListModel, SLOT(handleMailboxEvent(NmMailboxEvent, const QList<NmId> &)));

            }

        }

    } else {

        mMailboxListModel->clear();

    }

    QList<NmMailbox*> mailboxList;

    mDataManager->listMailboxes(mailboxList);

    mMailboxListModel->refresh(mailboxList);

    while (!mailboxList.isEmpty()) {

        delete mailboxList.takeFirst();

    }

}

/*!

    Returns a message list model for a folder identified by \a mailboxId and \a folderId.

    The model is updated dynamically. The ownership of the model object is not moved to the caller.

*/

NmMessageListModel &NmUiEngine::messageListModel(const NmId &mailboxId, const NmId &folderId)

{

    if (!mMessageListModel){

        mMessageListModel = new NmMessageListModel(*mDataManager);

    }

    else{

        mMessageListModel->clear();

    }

    QObject *plugin =

        mPluginFactory->pluginInstance(mailboxId);

    if (plugin) {

        QObject::connect(plugin,

            SIGNAL(messageEvent(NmMessageEvent, const NmId &, const QList<NmId> &, const NmId&)),

        mMessageListModel,

            SLOT(handleMessageEvent(NmMessageEvent, const NmId &, const QList<NmId> &)),

            Qt::UniqueConnection );

            Qt::UniqueConnection);

        QObject::connect(plugin,

            SIGNAL(connectionEvent(NmConnectState, const NmId &)),

            this,

            SIGNAL(connectionEvent(NmConnectState, const NmId &)),

            Qt::UniqueConnection);

        // Start to listen mailbox events

        NmDataPluginInterface *pluginInterface = mPluginFactory->interfaceInstance(plugin);

        if (pluginInterface) {

            pluginInterface->subscribeMailboxEvents(mailboxId);

        }

    }

    QList<NmMessageEnvelope*> messageEnvelopeList;

    mDataManager->listMessages(mailboxId, folderId, messageEnvelopeList);

    mMessageListModel->refresh(mailboxId, folderId, messageEnvelopeList);

    while (!messageEnvelopeList.isEmpty()) {

        delete messageEnvelopeList.takeFirst();

    }

    return *mMessageListModel;

}

/*!

*/

void NmUiEngine::releaseMessageListModel(const NmId &mailboxId)

{

    // Stop listening mailbox events

    NmDataPluginInterface *pluginInterface = mPluginFactory->interfaceInstance(mailboxId);

    if (pluginInterface) {

        pluginInterface->unsubscribeMailboxEvents(mailboxId);

    }

}

/*!

    Get the identifier of the standard folder of a type \a folderType 

    from the mailbox \a mailboxId.

*/

NmId NmUiEngine::standardFolderId(

    const NmId &mailboxId,

    NmFolderType folderType)

{

    NmId value;

    if (folderType != NmFolderOther) {

        NmDataPluginInterface *plugin =

            mPluginFactory->interfaceInstance(mailboxId);

        if(plugin) {

            value = plugin->getStandardFolderId(mailboxId, folderType);

        }

    }

    return value;

}

/*!

    Returns a message identified by \a mailboxId,  \a folderId and \amessageId.

    The ownership of the  object is moved to the caller.

    Returns null pointer if the message is not found.

*/

NmMessage *NmUiEngine::message(const NmId &mailboxId,

                      const NmId &folderId,

                      const NmId &messageId)

{

    NmMessage *message = mDataManager->message(mailboxId, folderId, messageId);

    return message;

}

/*!

*/

NmOperation *NmUiEngine::fetchMessage( const NmId &mailboxId,

    const NmId &folderId,

    const NmId &messageId )

{

    NmOperation *value(NULL);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        value = plugin->fetchMessage(mailboxId, folderId, messageId);

    }

    return value;

}

/*!

*/

NmOperation *NmUiEngine::fetchMessagePart(

    const NmId &mailboxId,

    const NmId &folderId,

    const NmId &messageId,

{

    NmOperation *value(NULL);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        value = plugin->fetchMessagePart(mailboxId, folderId, messageId, messagePartId);

    }

    return value;

}

/*!

    Get content to message part

*/

int NmUiEngine::contentToMessagePart(

    const NmId &mailboxId,

    const NmId &folderId,

    const NmId &messageId,

    NmMessagePart &messagePart)

{

    return mDataManager->contentToMessagePart(mailboxId, folderId, messageId, messagePart);

}

/*!

    Deletes messages from model and routes call to plugin

*/

int NmUiEngine::deleteMessages(

	const NmId &mailboxId,

	const NmId &folderId,

	const QList<NmId> &messageIdList)

{

    int result(NmNotFoundError);

	if (mMessageListModel) {

	    mMessageListModel->handleMessageEvent(NmMessageDeleted, folderId, messageIdList);

	}

    NmDataPluginInterface *plugin =

            mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

          result = plugin->deleteMessages(

	            mailboxId, folderId, messageIdList);

    }

	return result;

}

/*!

    Sets envelope property given in argument.

    Ownership of operation object is transferred to the caller.

*/

NmStoreEnvelopesOperation *NmUiEngine::setEnvelopes(

        const NmId &mailboxId,

        const NmId &folderId,

        NmEnvelopeProperties property,

        const QList<const NmMessageEnvelope*> &envelopeList)

{

    NMLOG("NmUiEngine::setEnvelopes() <---");

    NmStoreEnvelopesOperation *operation(NULL);

    if (mMessageListModel && envelopeList.count()) {

        QList<NmId> messageIdList;

        for (int i(0); i < envelopeList.count(); i++){

            messageIdList.append(envelopeList[i]->id());

        }

        mMessageListModel->setEnvelopeProperties(

                           property, messageIdList);

        // Store new envelopes to plugin

        NmDataPluginInterface *plugin =

            mPluginFactory->interfaceInstance(mailboxId);

        if (plugin) {

            operation = plugin->storeEnvelopes(

                    mailboxId, folderId, envelopeList);

        }

        messageIdList.clear();

    }

    NMLOG("NmUiEngine::setEnvelopes() --->");

    return operation;

}

/*!

    Returns a mailbox meta data object from model with the ID \a mailboxId.

    Ownership of the return value is not moved to the caller.

    Returns NULL if the mailbox is not found.

*/

NmMailboxMetaData *NmUiEngine::mailboxById(const NmId &mailboxId)

{

    NmMailboxMetaData *meta(NULL);

    if (mMailboxListModel) {

	    for (int i(0); i < mMailboxListModel->rowCount(); i++) {

	        QModelIndex index = mMailboxListModel->index(i,0);

	        NmMailboxMetaData *mailbox =

	            mMailboxListModel->data(index, Qt::DisplayRole).value<NmMailboxMetaData*>();

	        if (mailbox && mailbox->id() == mailboxId) {

	            meta = mailbox;

	            break;

	        }

	    }

    }

    return meta;

}

/*!

    Creates a new message (into Drafts-folder).

    Ownership of operation object is transferred to the caller.

*/

NmMessageCreationOperation *NmUiEngine::createNewMessage(const NmId &mailboxId)

{

    NmMessageCreationOperation *value(NULL);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        value = plugin->createNewMessage(mailboxId);

    }

    return value;

}

/*!

    Creates a new forward message (into Drafts-folder).

    Ownership of operation object is transferred to the caller.

*/

NmMessageCreationOperation *NmUiEngine::createForwardMessage(

        const NmId &mailboxId,

        const NmId &originalMessageId)

{

    NmMessageCreationOperation *value(NULL);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        value = plugin->createForwardMessage(mailboxId, originalMessageId);

    }

    return value;

}

/*!

    Creates a new reply message (into Drafts-folder).

    Ownership of operation object is transferred to the caller.

*/

NmMessageCreationOperation *NmUiEngine::createReplyMessage(

        const NmId &mailboxId,

        const NmId &originalMessageId,

        bool replyAll)

{

    NmMessageCreationOperation *value(NULL);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        value = plugin->createReplyMessage(mailboxId, originalMessageId, replyAll);

    }

    return value;

}

/*!

    Saves a message (into message store).

*/

int NmUiEngine::saveMessage(const NmMessage &message)

{

    const NmId &mailboxId = message.mailboxId();

    int ret(NmNotFoundError);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        ret = plugin->saveMessage(message);

    }

    return ret;

}

/*!

    Refreshes mailbox.

*/

int NmUiEngine::refreshMailbox(const NmId &mailboxId )

{

    int ret(NmNotFoundError);

    NmDataPluginInterface *plugin =

        mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

        ret = plugin->refreshMailbox(mailboxId);

    }

    return ret;

}

/*!

    Removes message from given mailbox and folder

    - routes call to plugin

*/

int NmUiEngine::removeMessage(

    const NmId &mailboxId,

    const NmId &folderId,

    const NmId &messageId)

{

    int result(NmNotFoundError);

    NmDataPluginInterface *plugin =

            mPluginFactory->interfaceInstance(mailboxId);

    if (plugin) {

          result = plugin->removeMessage(mailboxId, folderId, messageId);

    }

    return result;

}

/*!

    Takes ownership of an operation and connects to 

    it's completion signal

 */

void NmUiEngine::storeOperation(NmOperation *op)

{

    mOperations.append(op);

    connect(

            op, 

            SIGNAL(operationCompleted(int)), 

            this, 

            SLOT(handleCompletedOperation()));

}

/*!

    Sends the given message.

 */

{

    //First trigger message storing

    if (message) {