/*

 * 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:  Day view container - parent widget for events (CalenDayItem)

 * and hours area widgets (CalenDayEventsPane)

 * Responsible for positioning and resizing events widgets.

 */

//System includes

#include <QTime>

#include <QGraphicsLinearLayout>

#include <QGesture>

#ifdef _DEBUG

	#include <QPainter>

#endif

#include <HbAbstractItemView>

#include <HbTextItem>

#include <HbModelIterator>

#include <HbInstance>

//User includes

#include "calendaycontainer.h"

#include "calendayutils.h"

#include "calendayeventspane.h"

#include "calendayitem.h"

#include "calendaymodel.h"

#include "calendayinfo.h"

#include "calendayview.h"

#include "calenagendautils.h"

#include "calendaycommonheaders.h"

/*!

 \class CalenDayContainer

 \brief CalenDayContainer Item container class associated with model.

 */

/*!

 \brief Constructor

 Sets container initial geometry, creates hours area widgets.

 \param parent Parent object

 */

CalenDayContainer::CalenDayContainer(QGraphicsItem *parent) :

    HbAbstractItemContainer(parent), mGeometryUpdated(false), mInfo(0)

{

    getTimedEventLayoutValues(mLayoutValues);

    QGraphicsLinearLayout* timeLinesLayout = new QGraphicsLinearLayout(

        Qt::Vertical, this);

    for (int i = 0; i < KCalenHoursInDay; i++) {

        CalenDayEventsPane* element = new CalenDayEventsPane(this);

        // Draw top line at midnight

        if (i == 0) {

            element->setDrawTopLine(true);

        }

        timeLinesLayout->addItem(element);

    }

    timeLinesLayout->setContentsMargins(0.0, 0.0, 0.0, 0.0);

    timeLinesLayout->setSpacing(0.0);

    setLayout(timeLinesLayout);

}

/*!

 \brief Destructor

 */

CalenDayContainer::~CalenDayContainer()

{

    // Remove absorbers if exist

    if (mAbsorbers.count()) {

        qDeleteAll(mAbsorbers);

        mAbsorbers.clear();

    }

}

/*

 \reimp

 */

void CalenDayContainer::itemAdded(

    int index,

    HbAbstractViewItem *item,

    bool animate)

{

    Q_UNUSED( index )

    Q_UNUSED( item )

    Q_UNUSED( animate )

}

/*

 \brief Resets the state of container.

 Removes absorbers, gets layout values and maintains current position.

 */

void CalenDayContainer::reset()

{

    // Remove absorbers if exist

    if (mAbsorbers.count()) {

        qDeleteAll(mAbsorbers);

        mAbsorbers.clear();

    }

    // Shrink event area when all-day events available after reset

    getTimedEventLayoutValues(mLayoutValues);

    // Position need to be maintained while changing model

    QPointF position(pos());

    HbAbstractItemContainer::reset();

    setPos(position);

}

/*

 \reimp

 */

void CalenDayContainer::itemRemoved(HbAbstractViewItem *item, bool animate)

{

    Q_UNUSED( item )

    Q_UNUSED( animate )

}

/*

 \reimp

 */

void CalenDayContainer::viewResized(const QSizeF &size)

{

    resize(size);

    if (!mGeometryUpdated) {

        mGeometryUpdated = true;

        updateGeometry();

    }

}

/*

 \reimp

 */

HbAbstractViewItem * CalenDayContainer::createDefaultPrototype() const

{

    CalenDayItem *calendarViewItem = new CalenDayItem(this);

    return calendarViewItem;

}

/*

 \reimp

 */

void CalenDayContainer::setItemModelIndex(

    HbAbstractViewItem *item,

    const QModelIndex &index)

{

    QVariant variant = index.data(CalenDayEntry);

    AgendaEntry entry = variant.value<AgendaEntry> ();

    // Check for All Day Events and Timed entries

    if (CalenAgendaUtils::isAlldayEvent(entry)) {

        updateAllDayEventGeometry(item, index);

        item->setParentItem(this);

    }

    else

        if (entry.isTimedEntry()) {

            updateTimedEventGeometry(item, index);

            item->setParentItem(this);

        }

        else {

            item->setVisible(false);

        }

    // Create touch event absorbers after last item

    if (index.row() == index.model()->rowCount() - 1) {

        createTouchEventAbsorbers();

    }

    HbAbstractItemContainer::setItemModelIndex(item, index);

}

/*!

 \brief Set size and position of singe timed event widget (bubble)

 \a item bubble widget

 \a index pointing item data in model

 */

void CalenDayContainer::updateTimedEventGeometry(

    HbAbstractViewItem *item,

    const QModelIndex &index)

{

    // Safety check

    if (!mInfo) {

        return;

    }

    QVariant variant = index.data(CalenDayEntry);

    AgendaEntry entry = variant.value<AgendaEntry> ();

    // 1. Get 'virtual' event position from DayInfo

    SCalenApptInfo apptInfo;

    apptInfo.iIndex = index;

    QDateTime start;

    QDateTime end;

    QDateTime currentDate;

    currentDate

        = static_cast<const CalenDayModel*> (index.model())->modelDate();

    CalenDayUtils::instance()->getEventValidStartEndTime(start, end, entry,

        currentDate);

    apptInfo.iStartTime = start;

    apptInfo.iEndTime = end;

    TCalenInstanceId id = TCalenInstanceId::nullInstanceId();

    id.mEntryLocalUid = index.row(); //index.row() - temporary ID

    id.mInstanceTime = apptInfo.iStartTime;

    apptInfo.iId = id;

    apptInfo.iAllDay = 0;

    apptInfo.iColor = 0xffff;

    int startSlot, endSlot, columnIdx, columns;

    mInfo->GetLocation(apptInfo, startSlot, endSlot, columnIdx, columns);

    // 2. Set timed event's geometry

    qreal eventStartX(mLayoutValues.eventAreaX);

    qreal eventStartY(0.0);

    qreal eventWidth(mLayoutValues.eventAreaWidth);

    qreal eventHeight(0.0);

    // Event's startY/height

    eventStartY = startSlot * mLayoutValues.slotHeight;

    eventHeight = (endSlot - startSlot) * mLayoutValues.slotHeight;

    // Event's startX/width

    eventWidth /= columns;

    // In case when eventWidth will be smaller then KCalenMinEventWidth [un]

    // spacings between events should be smaller.

    // Check whether it's possible to shrink them so the bubbles width 

    // can stay at KCalenMinEventWidth [un] (time stripe + frame margins).

    qreal minWidth = KCalenMinEventWidth * mLayoutValues.unitInPixels;

    if (eventWidth - mLayoutValues.eventMargin < minWidth) {

        // Calculate new margin value

        // from totalMarginSpace we need to subtract mLayoutValues.eventMargin 

        // because first margin is always KCalenSpaceBeetwenEvents

        qreal totalMarginSpace = mLayoutValues.eventAreaWidth - minWidth

            * columns - mLayoutValues.eventMargin;

        qreal newMarginValue = totalMarginSpace / (columns - 1);

        // Check if we managed to pack all the events into space we have

        if (newMarginValue > 0) {

            eventWidth = minWidth;

        }

        else {

            // There's not enough space

            // New minWidth is KCalenMinTimeStripWidth [un] (time stripe only)

            minWidth = KCalenMinTimeStripWidth * mLayoutValues.unitInPixels;

            totalMarginSpace = mLayoutValues.eventAreaWidth - minWidth * columns 

				- mLayoutValues.eventMargin;

            newMarginValue = totalMarginSpace / (columns - 1);

            eventWidth = minWidth;

        }

        // First column margin should be always KCalenSpaceBeetwenEvents 

        // (mLayoutValues.eventMargin)

        eventStartX += columnIdx * (eventWidth + newMarginValue) + mLayoutValues.eventMargin;

    }

    else {

        // Add margins between the event

        eventStartX += columnIdx * eventWidth + mLayoutValues.eventMargin;

        eventWidth -= mLayoutValues.eventMargin;

    }

    // Verify if height of event is greater than minimum (UI spec)

    qreal minHeight = CalenDayUtils::instance()->minEventHeight();

    eventHeight = (eventHeight < minHeight ? minHeight : eventHeight);

    QRectF eventGeometry(eventStartX, eventStartY, eventWidth, eventHeight);

    // Workaround to prevent size hint caching inside effectiveSizeHint

    item->setMinimumSize(0, 0);

    item->setMaximumSize(eventWidth, eventHeight);

    item->setGeometry(eventGeometry);

}

/*!

 \brief Set size and position of singe all-day event widget (bubble)

 \a item bubble widget

 \a index pointing item data in model

 */

void CalenDayContainer::updateAllDayEventGeometry(

    HbAbstractViewItem *item,

    const QModelIndex &index)

{

    // Safety check

    if (!mInfo) {

        return;

    }

    QVariant variant = index.data(CalenDayEntry);

    AgendaEntry entry = variant.value<AgendaEntry> ();

    // 1. Get 'virtual' event position from DayInfo 

    SCalenApptInfo apptInfo;

    apptInfo.iIndex = index;

    QDateTime start;

    QDateTime end;

    QDateTime currentDate;

    currentDate

        = static_cast<const CalenDayModel*> (index.model())->modelDate();

    CalenDayUtils::instance()->getEventValidStartEndTime(start, end, entry,

        currentDate);

    apptInfo.iStartTime = start;

    apptInfo.iEndTime = end;

    TCalenInstanceId id = TCalenInstanceId::nullInstanceId();

    id.mEntryLocalUid = index.row(); //index.row() - temporary ID

    id.mInstanceTime = apptInfo.iStartTime;

    apptInfo.iId = id;

    apptInfo.iAllDay = true;

    apptInfo.iColor = 0xffff;

    int startSlot, endSlot, columnIdx, columns;

    mInfo->GetLocation(apptInfo, startSlot, endSlot, columnIdx, columns);

    // 2. Set timed event's geometry

    qreal eventStartX(0.0);

    qreal eventStartY(0.0);

    qreal eventWidth(mLayoutValues.eventAreaX);

    qreal eventHeight = (endSlot - startSlot) * mLayoutValues.slotHeight;

    // Event's startX/width

    if (columns > 1) {

        eventWidth /= columns;

        eventStartX += columnIdx * eventWidth + mLayoutValues.eventMargin;

        // Add margins between the event

        eventWidth -= mLayoutValues.eventMargin;

    }

    else {

        eventStartX += mLayoutValues.eventMargin;

        eventWidth -= mLayoutValues.eventMargin;

    }

    QRectF eventGeometry(eventStartX, eventStartY, eventWidth, eventHeight);

    // Workaround to prevent size hint caching inside effectiveSizeHint

    item->setMinimumSize(0, 0);

    item->setMaximumSize(eventWidth, eventHeight);

    item->setGeometry(eventGeometry);

}

/*!

 \brief Gets event layout values

 \a layoutValues structure to be filled with layout data

 */

void CalenDayContainer::getTimedEventLayoutValues(LayoutValues& layoutValues)

{

    // Get the width of entire content area

    qreal contentWidth = CalenDayUtils::instance()->contentWidth();

    HbStyle style;

    HbDeviceProfile deviceProfile;

    layoutValues.unitInPixels = deviceProfile.unitValue();

    // Empty right column's width

    qreal emptyRightColumnWidth = KCalenEmptyRightColumnWidth

        * layoutValues.unitInPixels;

    // Margins between the overlapping events -> eventMargin[out]

    layoutValues.eventMargin = KCalenSpaceBeetwenEvents

        * layoutValues.unitInPixels;

    // Start position (x) for drawing events -> eventAreaX[out]

    if (mInfo && mInfo->AlldayCount()) {

        layoutValues.eventAreaX = KCalenAllDayEventArea * (contentWidth

            - emptyRightColumnWidth);

    }

    else {

        layoutValues.eventAreaX = 0;

    }

    // Event area width (excluding All Day Events area)-> eventAreaWidth[out]

    layoutValues.eventAreaWidth = contentWidth - emptyRightColumnWidth

        - layoutValues.eventAreaX;

    // Half-hour slot's height -> slotHeight[out]

    layoutValues.slotHeight = CalenDayUtils::instance()->hourElementHeight()

        / KCalenSlotsInHour;

    // Check if touch absorbers should be created over some overlapping regions

    layoutValues.maxColumns = layoutValues.eventAreaWidth

        / ((KCalenMinTouchableEventWidth + KCalenSpaceBeetwenEvents)

            * layoutValues.unitInPixels);

}

/*!

 \brief Sets day's info structure to the container.

 \a dayInfo day's info data

 \sa CalenDayInfo, CalenDayContainer::dayInfo

 */

void CalenDayContainer::setDayInfo(CalenDayInfo* dayInfo)

{

    mInfo = dayInfo;

}

/*!

 \brief It return pointer to info structure of container.

 \sa CalenDayInfo, CalenDayContainer::setDayInfo

 */

CalenDayInfo* CalenDayContainer::dayInfo()

{

    return mInfo;

}

/*!

 \brief Sets date to the container. 

 Changes according to model which is connected to given view.

 \a date Date of container

 */

void CalenDayContainer::setDate(const QDate &date)

{

    mDate = date;

}

// -----------------------------------------------------------------------------

// date()

// Returns date of the container.

// -----------------------------------------------------------------------------

//

/*!

 \brief Returns date of the container.

 \sa date Date of container

 */

const QDate &CalenDayContainer::date() const

{

    return mDate;

}

/*!

 \brief Slot handles layout switch.

 \a orientation current device orientation

 */

void CalenDayContainer::orientationChanged(Qt::Orientation orientation)

{

    getTimedEventLayoutValues(mLayoutValues);

    Q_UNUSED( orientation )

    QList<HbAbstractViewItem *> items = this->items();

    int count(items.count());

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

        QModelIndex modelIndex = items[i]->modelIndex();

        if (modelIndex.isValid()) {

            QVariant variant = modelIndex.data(CalenDayEntry);

            AgendaEntry entry = variant.value<AgendaEntry> ();

            if (entry.isTimedEntry() && !CalenAgendaUtils::isAlldayEvent(entry)) {

                updateTimedEventGeometry(items[i], modelIndex);

            }

            else

                if (CalenAgendaUtils::isAlldayEvent(entry)) {

                    updateAllDayEventGeometry(items[i], modelIndex);

                }

        }

    }

    createTouchEventAbsorbers();

}

/*!

 \brief Creates absorbers which prevent touching to small items

 According to UI spec items smaller than 8.2 un are untouchable

 */

void CalenDayContainer::createTouchEventAbsorbers()

{

    // remove absorbers if exist

    if (mAbsorbers.count()) {

        qDeleteAll(mAbsorbers);

        mAbsorbers.clear();

    }

    // Create absorber for all-day events