/*

* 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:  CalenPreviewPane implementation.

*

*/

// System includes

#include <QtGui>

#include <qfont.h>

#include <qicon.h>

#include <qpainter.h>

#include <hblabel.h>

#include <hbmainwindow.h>

#include <hbframeitem.h>

#include <hbframedrawer.h>

#include <hbfontspec.h>

#include <hbcolorscheme.h>

#include <hbtapgesture.h>

#include <hbpangesture.h>

#include <hbinstance.h>

#include <hbinstantfeedback.h>

#include <agendautil.h>

#include <agendaentry.h>

//user includes

#include "calenagendautils.h"

#include "calendateutils.h"

#include "calencontext.h"

#include "calenservices.h"

#include "calenservices.h"

#include "calencommon.h"

#include "calenpreviewpane.h"

#include "calenmonthview.h"

#include "OstTraceDefinitions.h"

#ifdef OST_TRACE_COMPILER_IN_USE

#include "calenpreviewpaneTraces.h"

#endif

// Macros

#define TWO_SECONDS_TIMER 2000 // millseconds

#define SCROLLING_SPEED 10

#define MAX_PAN_DIRECTION_THRESHOLD 50

#define MIN_PAN_DIRECTION_THRESHOLD 10

static const QString EMPTYSTRING(" ");

/*!

 Constructor

 */

CalenPreviewPane::CalenPreviewPane(MCalenServices& services, 

							QGraphicsItem* parent)

	: HbScrollArea(parent),mServices(services)

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_CALENPREVIEWPANE_ENTRY );

	// Create the timer

	mTwoSecTimer = new QTimer(this);

	mScrollDirection = invalid;

	mIsNoEntriesAdded = true;

	mIsGestureHandled = false;

	mNoEntriesLabel = 0;

	mHtDiff = 0.0;

	mScrollDuration = 0;

	setAcceptDrops(true);

	setScrollDirections(Qt::Vertical);

	setVerticalScrollBarPolicy(HbScrollArea::ScrollBarAlwaysOff);

	// Connect the scrollig finished signal

	connect(this, SIGNAL(scrollingEnded()), this,

				SLOT(scrollingFinished()));

	grabGesture(Qt::TapGesture);

	grabGesture(Qt::PanGesture);

	OstTraceFunctionExit0( CALENPREVIEWPANE_CALENPREVIEWPANE_EXIT );

}

/*!

 Destructor

 */

CalenPreviewPane::~CalenPreviewPane()

{

    OstTraceFunctionEntry0( DUP1_CALENPREVIEWPANE_CALENPREVIEWPANE_ENTRY );

    OstTraceFunctionExit0( DUP1_CALENPREVIEWPANE_CALENPREVIEWPANE_EXIT );

}

/*!

 Stores the "No Entries for today" label

 */

void CalenPreviewPane::setNoEntriesLabel(HbLabel* label)

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_SETNOENTRIESLABEL_ENTRY );

	mNoEntriesLabel = label;

	OstTraceFunctionExit0( CALENPREVIEWPANE_SETNOENTRIESLABEL_EXIT );

}

/*!

 Populates the preview with proper data

 */

void CalenPreviewPane::populateLabel(QDateTime date)

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_POPULATELABEL_ENTRY );

	mScrollDirection = up;

	// Scroll contents to zero position before we display to the user

	// if it was scrolling already or timer was running

	mNumOfScrolls = 0;

	stopScrolling();

	mDate = date;

	// Get Instances for the day

	GetInstanceListL();

	// Get the content of the scroll area

	QGraphicsWidget* content = contentWidget();

	// Adjust the layout

	QGraphicsLinearLayout* layout = static_cast<QGraphicsLinearLayout *>

															(content->layout());

	int instanceCount = mInstanceArray.count();

	HbFontSpec font(HbFontSpec::Secondary);

	if (mIsNoEntriesAdded) {

		if (!instanceCount) {

		    mNoEntriesLabel->setVisible(true);

		    OstTraceFunctionExit0( CALENPREVIEWPANE_POPULATELABEL_EXIT );

		    return;

		} else {

			// Remove the no entries label

			mNoEntriesLabel->setVisible(false);

		}

	}

	int count = layout->count();

	int labelCount = mLabelList.count();

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

		mLabelList.at(i)->clear();

	}

	if (instanceCount) {

		mIsNoEntriesAdded = false;

		// Parse the instances and add them to the layout

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

			HbLabel* label;

			if(!count) {

				label = new HbLabel(this);

				// Set the required font

				label->setFontSpec(font);

				// Set the elide mode to right

				label->setElideMode(Qt::ElideRight);

				// Add the label to the list

				mLabelList.append(label);

				layout->addItem(label);

			} else {

				// Reuse the same label

				label = mLabelList.at(i);

				count--;

			}

			QString summary = mInstanceArray[i].summary();

			if(!summary.length()) {

				// No summary display "Unnamed"

				summary.append(hbTrId("txt_calendar_preview_unnamed"));

			}

			// Check the entry type, based on the type display time field in

			// preview pane.

			QString start;

			if(mInstanceArray[i].type() != AgendaEntry::TypeTodo && 

					mInstanceArray[i].type() != AgendaEntry::TypeAnniversary && 

					!CalenAgendaUtils::isAlldayEvent(mInstanceArray[i])) {

				QDateTime startTime = mInstanceArray[i].startTime();

				// Check if event starts in past

				checkStartTimeOfEvent(startTime);

				HbExtendedLocale systemLocale =HbExtendedLocale::system();

				start = systemLocale.format(startTime.time(), 

				                                    r_qtn_time_usual_with_zero);

				start.append(EMPTYSTRING);	

			}

			// Append summary to start time

			QString text = start.append(summary);

			label->setPlainText(text);

			layout->setStretchFactor(label,0);

		}

		// Cleanup the remaining labels

		if (count) {

			int layoutCount = layout->count();

			int offset = layoutCount - count;

			int labelCount = mLabelList.count();

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

				QGraphicsLayoutItem* item = layout->itemAt(offset);

				layout->removeAt(offset);

				int index = --labelCount;

				mLabelList.removeAt(index);

				if (item) {

					delete item;

				}

			}

		}

	} else { // Delete all the items in the layout

		// TODO: Need to see if we can clear all the items at one shot

		// remove the items if any

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

			QGraphicsLayoutItem* item = layout->itemAt(0);

			layout->removeAt(0);

			// Clear the label text

			mLabelList.at(i)->clear();

			if (item) {

				delete item;

			}

		}

		// Clear the list

		mLabelList.clear();

		// Add the no entries text to the preview pane

		mNoEntriesLabel->setVisible(true);

		mIsNoEntriesAdded = true;

	}

	layout->activate();

	OstTraceFunctionExit0( DUP1_CALENPREVIEWPANE_POPULATELABEL_EXIT );

}

/*!

 Fetches the instance for a given day

 */

void CalenPreviewPane::GetInstanceListL()

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_GETINSTANCELISTL_ENTRY );

	mInstanceArray.clear();

	// Find Meetings, Remainders, Anniversaries and Day Notes

	QDateTime dayStart( CalenDateUtils::beginningOfDay( mDate ) );

	// Make a request to get all the entries for the mDate

	AgendaUtil::FilterFlags filter = AgendaUtil::FilterFlags(

										AgendaUtil::IncludeAnniversaries |

										AgendaUtil::IncludeAppointments |

											AgendaUtil::IncludeEvents |

											AgendaUtil::IncludeIncompletedTodos | 

										AgendaUtil::IncludeReminders);

	mInstanceArray = mServices.agendaInterface()->

									createEntryIdListForDay(dayStart, filter);

	OstTraceFunctionExit0( CALENPREVIEWPANE_GETINSTANCELISTL_EXIT );

}

/*!

 Returns the date which this preview pane is representing

 */

QDateTime CalenPreviewPane::Date()

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_DATE_ENTRY );

	OstTraceFunctionExit0( CALENPREVIEWPANE_DATE_EXIT );

	return mDate;

}

/*!

 Starts the auto scroll on the preview pane

 */

void CalenPreviewPane::startAutoScroll()

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_STARTAUTOSCROLL_ENTRY );

	if (mIsNoEntriesAdded) {

		scrollContentsTo(QPointF(0.0,0.0));

		OstTraceFunctionExit0( CALENPREVIEWPANE_STARTAUTOSCROLL_EXIT );

		return;

	}

	// Start the 2 seconds timer

	mTwoSecTimer->setSingleShot(true);

	connect(mTwoSecTimer, SIGNAL(timeout()), this, SLOT(onTwoSecondsTimeout()));

	mTwoSecTimer->start(TWO_SECONDS_TIMER);

	OstTraceFunctionExit0( DUP1_CALENPREVIEWPANE_STARTAUTOSCROLL_EXIT );

}

/*!

 Slot to handle two seconds timer time out

 Starts the scrolling animation in required direction

 */

void CalenPreviewPane::onTwoSecondsTimeout()

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_ONTWOSECONDSTIMEOUT_ENTRY );

	mTwoSecTimer->stop();

	disconnect(mTwoSecTimer, SIGNAL(timeout()), 

										   this, SLOT(onTwoSecondsTimeout()));

	// Calculate the timer and the height difference of pane and its content

	if (!mScrollDuration) {

        qreal contentHeight = contentWidget()->size().height();

        qreal paneHeight = size().height();

        mHtDiff = contentHeight - paneHeight;

        if (mHtDiff > 0) { // content is more than widget height, we need to scroll

            mScrollDuration = mHtDiff / SCROLLING_SPEED;

        }

	}

    // Start the scrolling in the proper direction

	if (mScrollDirection == up) {

		// Start scrolling upwards

		mScrollDirection = down;

		mNumOfScrolls++;

		QPointF targetPos(0.0, -mHtDiff);

        scrollContentsTo(-targetPos, mScrollDuration * 1000);

	} else if (mScrollDirection == down) {

		mScrollDirection = up;

		mNumOfScrolls++;

		// Start scrolling downwards

		QPointF targetPos(0.0, 0.0);

        scrollContentsTo(targetPos, mScrollDuration * 1000);

	}

	OstTraceFunctionExit0( CALENPREVIEWPANE_ONTWOSECONDSTIMEOUT_EXIT );

}

/*!

 Slot to handle scrolling finished

 Restarts the two seconds timer

 */

void CalenPreviewPane::scrollingFinished()

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_SCROLLINGFINISHED_ENTRY );

	// If we are here because of calling scrollContentsTo()

	if (!mNumOfScrolls) {

		OstTraceFunctionExit0( CALENPREVIEWPANE_SCROLLINGFINISHED_EXIT );

		return;

	}

	// Now start the two seconds timer again

	mTwoSecTimer->setSingleShot(true);

	connect(mTwoSecTimer, SIGNAL(timeout()), this, SLOT(onTwoSecondsTimeout()));

	mTwoSecTimer->start(TWO_SECONDS_TIMER);

	OstTraceFunctionExit0( DUP1_CALENPREVIEWPANE_SCROLLINGFINISHED_EXIT );

}

/*!

    Function to listen for all gestures

 */

void CalenPreviewPane::gestureEvent(QGestureEvent *event)

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_GESTUREEVENT_ENTRY );

    if(HbPanGesture *gesture = qobject_cast<HbPanGesture *>(event->gesture(Qt::PanGesture))) {

        if (gesture->state() == Qt::GestureUpdated) {

            // Check if effect is not yet completed, ignore the current gesture if it is

            if (mIsGestureHandled) {

                OstTraceFunctionExit0( CALENPREVIEWPANE_GESTUREEVENT_EXIT );

                return;

            }

            // TODO: This work around till framework provides an api

            // to know the direciton of the pan, until then we need

            // calculate the direction explicitly

            // Get to know the direction of the gesture

            QPointF delta = gesture->delta();

            // Check the current orientation of the device and

            // swap the vertical and horizontal distances in landscape

            qreal horizontalDiff = 0.0;

            qreal verticalDiff = 0.0;

            if (hbInstance->allMainWindows().at(0)->orientation() == Qt::Vertical) {

                horizontalDiff = delta.x();

                verticalDiff = delta.y();

            } else {

                horizontalDiff = delta.y();

                verticalDiff = delta.x();

            }

            if (abs(verticalDiff) > MAX_PAN_DIRECTION_THRESHOLD) {

                // Now see if x coord diff has crossed threshold

                if (horizontalDiff > MAX_PAN_DIRECTION_THRESHOLD) {

                    mIsGestureHandled = true;

                    // right gesture

                    mView->handlePreviewPaneGesture(true);

                    event->accept(Qt::PanGesture);

                } else if (horizontalDiff < -MAX_PAN_DIRECTION_THRESHOLD){

                    mIsGestureHandled = true;

                    // left gesture

                    mView->handlePreviewPaneGesture(false);

                    event->accept(Qt::PanGesture);

                } else {

                    event->accept(Qt::PanGesture);

                    OstTraceFunctionExit0( DUP1_CALENPREVIEWPANE_GESTUREEVENT_EXIT );

                    return;

                }

            } else if (abs(verticalDiff) < MAX_PAN_DIRECTION_THRESHOLD) {

               if (horizontalDiff > MIN_PAN_DIRECTION_THRESHOLD) {

                   mIsGestureHandled = true;

                   // right gesture

                   mView->handlePreviewPaneGesture(true);

                   event->accept(Qt::PanGesture);

               } else if (horizontalDiff < -MIN_PAN_DIRECTION_THRESHOLD){

                   mIsGestureHandled = true;

                   // left gesture

                   mView->handlePreviewPaneGesture(false);

                   event->accept(Qt::PanGesture);

               }else {

                   event->accept(Qt::PanGesture);

                   OstTraceFunctionExit0( DUP2_CALENPREVIEWPANE_GESTUREEVENT_EXIT );

                   return;

               }

            }

        }

    } else if(QTapGesture *tapGesture = qobject_cast<QTapGesture *>(event->gesture(Qt::TapGesture))) {

        if (tapGesture && tapGesture->state() == Qt::GestureFinished) {

            	HbInstantFeedback::play(HbFeedback::Basic);

                // Preview pane tapped

                mServices.IssueCommandL(ECalenAgendaView);

                event->accept(Qt::TapGesture);

        }

    }

}

/*!

 Set monthview pointer

 */

void CalenPreviewPane::setView(CalenMonthView* view)

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_SETVIEW_ENTRY );

	mView = view;

	OstTraceFunctionExit0( CALENPREVIEWPANE_SETVIEW_EXIT );

}

/*!

 Stops the auto scrolling

 */

void CalenPreviewPane::stopScrolling()

{

    OstTraceFunctionEntry0( CALENPREVIEWPANE_STOPSCROLLING_ENTRY );

	if (isScrolling() || mTwoSecTimer->isActive()) {

		scrollContentsTo(QPointF(0.0,0.0));

		// Call pan gesture with zero delta just to stop the scfrolling 

		HbScrollArea::panGesture(QPointF(0.0,0.0));

		mTwoSecTimer->stop();

	}

	OstTraceFunctionExit0( CALENPREVIEWPANE_STOPSCROLLING_EXIT );

}

/*!

 Checks if the start time of the event falls on the date for which preview

 pane is being shown. If start time is in past, then time will be 12:00AM

 */

void CalenPreviewPane::checkStartTimeOfEvent(QDateTime &dateTime)

{

    // If event start time is in past

    if (dateTime.date() < mDate.date()) {

        // Set the time to 12:00AM of mDate

        dateTime.setDate(mDate.date());

        QTime time(0,0,0,0); // 0 means 12:00 AM

        dateTime.setTime(time);

    }

}

/*!

 Sets the effect beign handled flag to true

 */

void CalenPreviewPane::effectStarted()

{

    mIsGestureHandled = true;

}

/*!

 Resets the effect beign handled flag to true

 */

void CalenPreviewPane::effectFinished()