/*

* Copyright (c) 2010 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:

*

*/

static const char *NMUI_MESSAGE_SEARCH_LIST_VIEW_XML = ":/docml/nmmessagesearchlistview.docml";

static const char *NMUI_MESSAGE_SEARCH_LIST_VIEW = "NmMessageSearchListView";

static const char *NMUI_MESSAGE_SEARCH_LIST_TREE_LIST = "MessageTreeList";

static const char *NMUI_MESSAGE_SEARCH_LIST_NO_MESSAGES = "MessageListNoMessages";

static const char *NMUI_MESSAGE_SEARCH_LIST_INFO_LABEL = "LabelGroupBox";

static const char *NMUI_MESSAGE_SEARCH_LIST_LINE_EDIT = "LineEdit";

static const char *NMUI_MESSAGE_SEARCH_LIST_PUSH_BUTTON = "PushButton";

#include "nmuiheaders.h"

/*!

    \class NmMessageSearchListView

    \brief The view for searching messages.

*/

/*!

    Class constructor.

*/

NmMessageSearchListView::NmMessageSearchListView(

    NmApplication &application,

    NmUiStartParam* startParam,

    NmUiEngine &uiEngine,

    NmMessageListModel &msgListModel,

    HbDocumentLoader *documentLoader,

    QGraphicsItem *parent)

: NmBaseView(startParam, application, parent),

  mApplication(application),

  mUiEngine(uiEngine),

  mMsgListModel(msgListModel),

  mDocumentLoader(documentLoader),

  mItemContextMenu(NULL),

  mMessageListWidget(NULL),

  mInfoLabel(NULL),

  mNoMessagesLabel(NULL),

  mLineEdit(NULL),

  mPushButton(NULL),

  mLongPressedItem(NULL),

  mViewReady(false),

  mSearchInProgress(false)

{

    NM_FUNCTION;

    loadViewLayout();

    initTreeView();

}

/*!

    Class destructor.

*/

NmMessageSearchListView::~NmMessageSearchListView()

{

    NM_FUNCTION;

    delete mDocumentLoader;

    mWidgetList.clear();

    if (mItemContextMenu){

        mItemContextMenu->clearActions();

    }

    delete mItemContextMenu;

}

/*!

    From NmBaseView.

    Returns the view ID.

    \return The view ID.

*/

NmUiViewId NmMessageSearchListView::nmailViewId() const

{

    NM_FUNCTION;

    return NmUiViewMessageSearchList;

}

/*!

    From NmBaseView.

    Does the lazy loading after the view layout has been loaded.

*/

void NmMessageSearchListView::viewReady()

{

    NM_FUNCTION;

    if (!mViewReady){

        // Set the mailbox name to the title pane.

        setViewTitle();

        // Refresh the list.

        QMetaObject::invokeMethod(this, "refreshList", Qt::QueuedConnection);

        // Highlight the search input.

        setSearchInputMode(NmHighlightedMode);

        mViewReady = true;

    }

}

/*!

    From NmMenuObserver.

    Handles action commands which are usually given by the user by selecting

    menu items.

    \param actionResponse The command details.

*/

void NmMessageSearchListView::handleActionCommand(NmActionResponse &actionResponse)

{

    NM_FUNCTION;

    // Handle options menu commands here.

    if (actionResponse.menuType() == NmActionOptionsMenu) {

        switch (actionResponse.responseCommand()) {

            case NmActionResponseCommandUpdateMailboxName: {

                setViewTitle();

                break;

            }

            case NmActionResponseCommandMailboxDeleted: {

                mApplication.prepareForPopView();

                break;

            }

            default: {

                break;

            }

        }

    }

    // Handle context menu commands here.

    if (actionResponse.menuType() == NmActionContextMenu) {

        if (mLongPressedItem){

            NmUiStartParam *startParam = new NmUiStartParam(NmUiViewMessageViewer,

                mStartParam->mailboxId(), mLongPressedItem->envelope().folderId(),

                mLongPressedItem->envelope().messageId());

            mApplication.enterNmUiView(startParam);

            mLongPressedItem = NULL;

       }

    }

}

/*!

    From NmBaseView.

    Loads the view layout from the XML file.

*/

void NmMessageSearchListView::loadViewLayout()

{

    NM_FUNCTION;

    // Use the document loader to load the view layout.

    bool ok(false);

    setObjectName(QString(NMUI_MESSAGE_SEARCH_LIST_VIEW));

    QObjectList objectList;

    objectList.append(this);

    // Pass the view to the document loader. Instead of creating a new view, the

    // document loader uses this view when the docml file is parsed.

    if (mDocumentLoader) {

        mDocumentLoader->setObjectTree(objectList);

        mWidgetList = mDocumentLoader->load(NMUI_MESSAGE_SEARCH_LIST_VIEW_XML, &ok);

    }

    if (ok) {

        // Load the search panel (contains the line edit and the push button

        // widgets.

        mLineEdit = qobject_cast<HbLineEdit *>(

            mDocumentLoader->findWidget(NMUI_MESSAGE_SEARCH_LIST_LINE_EDIT));

        if (mLineEdit) {

            connect(mLineEdit, SIGNAL(textChanged(QString)), 

                    this, SLOT(criteriaChanged(QString)));

        }

        mPushButton = qobject_cast<HbPushButton *>(

        mDocumentLoader->findWidget(NMUI_MESSAGE_SEARCH_LIST_PUSH_BUTTON));

        if (mPushButton) {

            // button is disabled when line edit is empty

            mPushButton->setEnabled(false);

            // The push button both starts and stops the search.

            connect(mPushButton, SIGNAL(clicked()), this, SLOT(toggleSearch()));

            mPushButton->setIcon(HbIcon("qtg_mono_search"));

        }

        // Load the info label.

        mInfoLabel = qobject_cast<HbGroupBox *>(

            mDocumentLoader->findWidget(NMUI_MESSAGE_SEARCH_LIST_INFO_LABEL));

        if (mInfoLabel) {

            NM_COMMENT("NmMessageSearchListView: info label loaded");

            // If the heading is empty, the widget will not be shown which in

            // turn would ruin the layout.

            mInfoLabel->setHeading(" ");

        }

        // Get the message list widget.

        mMessageListWidget = qobject_cast<HbTreeView *>(

            mDocumentLoader->findWidget(NMUI_MESSAGE_SEARCH_LIST_TREE_LIST));

        if (mMessageListWidget) {

            NM_COMMENT("NmMessageSearchListView: message list widget loaded");

            // Set the item prototype.

            mMessageListWidget->setItemPrototype(new NmMessageListViewItem());

            // Set the list widget properties.

            mMessageListWidget->setItemRecycling(true);

            mMessageListWidget->contentWidget()->setProperty("indentation", 0);

            mMessageListWidget->setScrollDirections(Qt::Vertical);

            mMessageListWidget->setClampingStyle(HbScrollArea::BounceBackClamping);

            mMessageListWidget->setFrictionEnabled(true);

            // We want the search results to appear one by one.

            mMessageListWidget->setEnabledAnimations(HbAbstractItemView::Appear &

                                                     HbAbstractItemView::Expand);

        }

        // Load the no messages label.

        mNoMessagesLabel = qobject_cast<HbLabel *>(

            mDocumentLoader->findWidget(NMUI_MESSAGE_SEARCH_LIST_NO_MESSAGES));

        if (mNoMessagesLabel) {

            NMLOG("NmMessageSearchListView: No messages label loaded.");

            mNoMessagesLabel->hide();

        }

    }

    else {

        NM_ERROR(1, "NmMessageSearchListView: failed to load widgets from XML");

    }

}

/*!

    Initializes the tree view.

*/

void NmMessageSearchListView::initTreeView()

{

    NM_FUNCTION;

    // Get the mailbox widget pointer and set the parameters.

    if (mMessageListWidget) {

        connect(mMessageListWidget, SIGNAL(activated(const QModelIndex &)),

                this, SLOT(itemActivated(const QModelIndex &)));

        connect(mMessageListWidget, SIGNAL(longPressed(HbAbstractViewItem*, QPointF)),

                this, SLOT(showItemContextMenu(HbAbstractViewItem*, QPointF)));

        mMessageListWidget->setFocus();

        mItemContextMenu = new HbMenu();

    }

    // Clear the previous content if any.

    mMsgListModel.clear();

}

/*!

    Sets the title according to the name of the current mailbox.

*/

void NmMessageSearchListView::setViewTitle()

{

    NM_FUNCTION;

    if (mStartParam){

        NmMailboxMetaData *meta = mUiEngine.mailboxById(mStartParam->mailboxId());

        if (meta){

            setTitle(meta->name());

        }

    }

}

/*!

    Toggles the visiblity between the message list widget and the "no messages"

    label.

    \param visible If true, will display the "no messages" label. If false,

                   will display the message list widget.

*/

void NmMessageSearchListView::noMessagesLabelVisibility(bool visible)

{

    NM_FUNCTION;

    if (visible) {

        // Hide the message list widget and display the "no messages" label.

        if (mMessageListWidget) {

            mMessageListWidget->hide();

        }

        if (mNoMessagesLabel && !mNoMessagesLabel->isVisible()) {

            mNoMessagesLabel->show();

        }

    }

    else {

        // Hide the "no messages" label and display the message list widget.

        if (mNoMessagesLabel && mNoMessagesLabel->isVisible()) {

            mNoMessagesLabel->hide();

        }

        if (mMessageListWidget) {

            mMessageListWidget->show();

        }

    }

}

/*!

    Updates the search result count information. If the message list does not

    contain any items, a "no messages" label is displayed. Otherwise the result

    count in the information label is updated according to the number of

    messages in the list.

*/

void NmMessageSearchListView::updateSearchResultCountInfo()

{

    NM_FUNCTION;

    const int resultCount = mMsgListModel.rowCount();

    if (resultCount) {

        if (mInfoLabel) {

            // Display the result count on the info label.

            mInfoLabel->setHeading(resultsString);

            if (!mInfoLabel->isVisible()) {

                mInfoLabel->show();

            }

        }

    }

    else {

        // No search results!

        if (mInfoLabel && mInfoLabel->isVisible()) {

            mInfoLabel->hide();

        }

        // Display the "no messages" label and highlight the search term.

        noMessagesLabelVisibility(true);

    }

}

/*!

    Sets the mode for the search input.

    \param mode The mode to set.

*/

void NmMessageSearchListView::setSearchInputMode(NmSearchInputMode mode)

{

    NM_FUNCTION;

    if (!mLineEdit) {

        // No line edit widget!

        return;

    }

    switch (mode) {

        case NmNormalMode: {

            mLineEdit->setEnabled(true);

            break;

        }

        case NmHighlightedMode: {

            mLineEdit->setEnabled(true);

            mLineEdit->setFocus();

            break;

        }

        case NmDimmedMode: {

            mLineEdit->setEnabled(false);

            break;

        }

    }

}

/*!

    From NmBaseView.

    Reloads the view contents with new start parameters. This method is

    typically used when the view is already open and an external view activation

    occurs for this same view.

*/

void NmMessageSearchListView::reloadViewContents(NmUiStartParam *startParam)

{

    NM_FUNCTION;

    if (startParam && startParam->viewId() == NmUiViewMessageSearchList) {

        // Delete the existing start parameter data.

        delete mStartParam;

        mStartParam = NULL;

        // Store the new start parameter data.

        mStartParam = startParam;

        // Update the model with new parameters.

        mUiEngine.messageListModelForSearch(startParam->mailboxId());

        refreshList();

        // Refresh the mailbox name.

        setViewTitle();

    }

    else {

        // Invalid start parameter data! Unused start parameter needs to be

        // deleted.

        NM_ERROR(1, "NmMessageSearchListView: invalid message list start parameter");

        delete startParam;

    }

}

/*!

    Called when text is changed in the edit field. If there is no search term

    in the edit field, the search button is dimmed and disabled. If the field

    contains text, the button can be clicked.

    \param text The text in the field after the modification.

*/

void NmMessageSearchListView::criteriaChanged(QString text) 

{

    NM_FUNCTION;

    NM_COMMENT(QString("NmMessageSearchListView::criteriaChanged %1").arg(text));

    // Check if the button should be disabled/enabled.

    bool enabled = mPushButton->isEnabled();

    if (!enabled && !text.isEmpty()) {

        mPushButton->setEnabled(true);

    }

    else if (enabled && text.isEmpty()) {

        mPushButton->setEnabled(false);

    }

}

/*!

    Displays the item context menu. This method gets called if an item on the

    list is long pressed.

*/

void NmMessageSearchListView::showItemContextMenu(

    HbAbstractViewItem *listViewItem, const QPointF &coords)

{

    NM_FUNCTION;

    // Store long press item for later use with response.

    mLongPressedItem = 

        mMsgListModel.data(listViewItem->modelIndex(),

                           Qt::DisplayRole).value<NmMessageListModelItem*>();

    if (mItemContextMenu && mLongPressedItem &&

        mLongPressedItem->itemType() == NmMessageListModelItem::NmMessageItemMessage) {

        // Clear the previous menu actions.

        mItemContextMenu->clearActions();

        NmUiExtensionManager &extMngr = mApplication.extManager();

        QList<NmAction*> list;

        // Fetch the menu actions based on the selected item.

        NmMessageEnvelope *envelope = mLongPressedItem->envelopePtr();

        if (envelope){

            NmActionRequest request(this, NmActionContextMenu,

                NmActionContextViewMessageSearchList, NmActionContextDataMessage,

                mStartParam->mailboxId(), envelope->folderId(),

                envelope->messageId(), QVariant::fromValue(envelope));

            extMngr.getActions(request, list);

        }

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

            mItemContextMenu->addAction(list[i]);

        }

        mItemContextMenu->setPreferredPos(coords);

        mItemContextMenu->open();

    }

}

/*!

    Stores the given index and forwards the call to handleSelection(). This

    method gets called when an item on the list is selected.  

    \param index The index of the activated item.