/*

* 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:

* Definition file for class NotesModel.

*

*/

// System includes

#include <QAbstractItemModel>

#include <QStandardItemModel>

#include <QTimer>

#include <QDateTime>

#include <HbIcon>

#include <HbExtendedLocale>

// User includes

#include "notesmodel.h"

#include "notescommon.h"

/*!

	\class NotesModel

	This is the source model class for the notes application views. This owns

	a QStandardItemModel which is a model for the data containing notes, todos

	and reminders.

 */

/*!

	Constructor.

	\param agendaUtil Pointer to the object of AgendaUtil.

	\param parent Parent of type QObject.

 */

NotesModel::NotesModel(AgendaUtil *agendaUtil, QObject *parent)

:QObject(parent),

 mAgendaUtil(agendaUtil)

{

	// Construct the source model.

	mSourceModel = new QStandardItemModel(0, 1, this);

	connect(

			mAgendaUtil, SIGNAL(entriesChanged(QList<ulong>)),

			this, SLOT(populateSourceModel(QList<ulong>)));

	// Connect to entryAdded signal of agendautil.

	connect(

			mAgendaUtil, SIGNAL(entryAdded(ulong)),

			this, SLOT(addEntryToModel(ulong)));

	// Connect to entryDeleted signal of agendautil.

	connect(

			mAgendaUtil, SIGNAL(entryDeleted(ulong)),

			this, SLOT(removeEntryFromModel(ulong)));

	// Connect to entryUpdated signal of agendautil.

	connect(

			mAgendaUtil, SIGNAL(entryUpdated(ulong)),

			this, SLOT(updateSourceModel(ulong)));

	// Connect for instance view creation completed signal

	connect(

			mAgendaUtil, SIGNAL(instanceViewCreationCompleted(int)),

			this,SLOT(handleInstanceViewCreationCompleted(int)));

}

/*!

	Destructor.

 */

NotesModel::~NotesModel()

{

	// Nothing yet.

}

/*!

	Returns the source model to be used with a view.

	\return QAbstractItemModel

	\sa QAbstractItemModel, HbListView.

 */

QAbstractItemModel *NotesModel::sourceModel()

{

	Q_ASSERT(mSourceModel);

	return mSourceModel;

}

/*!

	Populates the source model.

 */

void NotesModel::populateSourceModel()

{

	// Clear the model if it has any data already

	mSourceModel->clear();

	mSourceModel->setColumnCount(1);

	mNotesCount = mInCompTodoCount = mCompTodoCount = 0;

	// The order of appending the items to the model is:

	// 1. Notes, 2. Incompleted to-dos, 3. Completed to-dos.

	// First get only the notes and populate the model.

	QList<AgendaEntry> agendaEntyList = mAgendaUtil->fetchAllEntries(

			(AgendaUtil::FilterFlags) (AgendaUtil::IncludeNotes));

	// Add the notes to the model.

	appendNotesToModel(agendaEntyList);

	// Get the incompleted to-dos.

	agendaEntyList.clear();

	agendaEntyList = mAgendaUtil->fetchAllEntries(

			(AgendaUtil::FilterFlags) (AgendaUtil::IncludeIncompletedTodos));

	// Add the incompleted to-dos to the model.

	appendInCompTodosToModel(agendaEntyList);

	// Get the completed to-dos.

	agendaEntyList.clear();

	agendaEntyList = mAgendaUtil->fetchAllEntries(

			(AgendaUtil::FilterFlags) (AgendaUtil::IncludeCompletedTodos));

	// Add the completed to-dos to the model.

	appendCompTodosToModel(agendaEntyList);

}

/*!

	Updates the source model with the given entry `id'.

	The entry could be either have undergone a status change or have just been

	modified.

	\param id Of type ulong, identifies the entry which was changed.

 */

void NotesModel::updateSourceModel(ulong id)

{

	AgendaEntry entry = mAgendaUtil->fetchById(id);

	if (entry.isNull()) {

		return;

	}

	// Entry can be updated in many ways.

	// 1. Notes can just change their content or can be marked/unmarked as

	// favourites. So for any change with a note, we move the model index

	// representing the note to the top of the list.

	if (AgendaEntry::TypeNote == entry.type()) {

		QModelIndex foundIndex;

		for (int iter = 0; iter < mNotesCount; iter++) {

			foundIndex = mSourceModel->index(iter, 0);

			if (!foundIndex.isValid()) {

				continue;

			}

			ulong noteId = foundIndex.data(

					NotesNamespace::IdRole).value<qulonglong>();

			if (id == noteId) {

				break;

			}

		}

		QStandardItem *item = mSourceModel->takeItem(foundIndex.row());

		mSourceModel->removeRow(foundIndex.row());

		mNotesCount--;

		// Insert the note to the 0th postion.

		insertNoteToModel(foundIndex, id);

	} else if (AgendaEntry::TypeTodo == entry.type()) {

		// 2. To-dos content can be modified.

		// So we check the status of the to-do. If the status has changed, we

		// check the previous status and remove the model index from the

		// corresponding section. Else we just update the to-do contents.

		QModelIndex foundIndex;

		for (int iter = mNotesCount;

				iter < mNotesCount + mInCompTodoCount + mCompTodoCount + 1;

				iter++) {

			foundIndex = mSourceModel->index(iter, 0);

			if (!foundIndex.isValid()) {

				continue;

			}

			ulong noteId = foundIndex.data(

					NotesNamespace::IdRole).value<qulonglong>();

			if (id == noteId) {

				break;

			}

		}

		// Get the status of the to-do.

		AgendaEntry::Status entryStatus = (AgendaEntry::Status) foundIndex.data(

				NotesNamespace::StatusRole).value<int>();

		if (entry.status() == entryStatus) {

			if (AgendaEntry::TodoNeedsAction == entryStatus) {

				// Make sure that the old model index is removed.

				mSourceModel->removeRow(foundIndex.row());

				mInCompTodoCount--;

				// Now insert the to-do.

				insertInCompTodoToModel(foundIndex, id);

			} else if (AgendaEntry::TodoCompleted == entryStatus) {

				// Make sure that the old model index is removed.

				mSourceModel->removeRow(foundIndex.row());

				mCompTodoCount--;

				// Now insert the completed to-do.

				insertCompTodoToModel(foundIndex, id);

			}

		} else {

			if (AgendaEntry::TodoNeedsAction == entryStatus) {

				// Here the to-do was marked completed. Hence we need to remove

				// the incompleted to-do and insert a completed to-do.

				mSourceModel->removeRow(foundIndex.row());

				mInCompTodoCount--;

				// Now insert the completed to-do.

				insertCompTodoToModel(foundIndex, id);

			} else if (AgendaEntry::TodoCompleted == entryStatus) {

				// Here the to-do was marked incompleted. Hence we need to

				// remove the completed to-do and insert an incompleted to-do.

				mSourceModel->removeRow(foundIndex.row());

				mCompTodoCount--;

				// Now insert the incompleted to-do.

				insertInCompTodoToModel(foundIndex, id);

			}

		}

	}

}

/*!

	Populates the source model. This slot is called when we get a db change

	notification from agenda server caused by another session.

	\param ids List of ids containing the entries that got changed.

 */

void NotesModel::populateSourceModel(QList<ulong> ids)

{

	Q_UNUSED(ids)

	QTimer::singleShot(1, this, SLOT(populateSourceModel()));

}

/*!

	Adds an entry to the model i.e., creates a QModelIndex and inserts it to the

	model.

	\param id The id of the entry to be added to the model.

 */

void NotesModel::addEntryToModel(ulong id)

{

	// We have different logic for adding a note or an incompleted to-do or a

	// completed to-do.

	AgendaEntry entry = mAgendaUtil->fetchById(id);

	if (entry.isNull()) {

		return;

	}

	bool notify = false;

	QModelIndex indexToNotify;

	if (AgendaEntry::TypeNote == entry.type()) {

		// All new notes are inserted at the top of the list by default.

		// Create a new model index at the 0th position.

		notify = insertNoteToModel(indexToNotify, id);

	} else if (AgendaEntry::TypeTodo == entry.type()) {

		if (AgendaEntry::TodoNeedsAction == entry.status()) {

			// Try to insert the to-do at its appropriate position.

			notify = insertInCompTodoToModel(indexToNotify, id);

		} else if (AgendaEntry::TodoCompleted == entry.status()) {

			// Try to insert the to-do at its appropriate position.

			insertCompTodoToModel(indexToNotify, id);

		}

	}

	if (notify) {

		emit rowAdded(indexToNotify);

	}

}

/*!

	Deletes an entry from model.

	\param Deletes the entry from model and hence updating the view.

 */

void NotesModel::removeEntryFromModel(ulong id)

{

	for (int iter = 0; iter < mSourceModel->rowCount(); iter++) {

		QModelIndex mdlIndex = mSourceModel->index(iter, 0);

		if (!mdlIndex.isValid()) {

			return;

		}

		ulong noteId = mdlIndex.data(

				NotesNamespace::IdRole).value<qulonglong>();

		AgendaEntry::Type entryType = (AgendaEntry::Type) mdlIndex.data(

				NotesNamespace::TypeRole).value<int>();

		AgendaEntry::Status entryStatus = (AgendaEntry::Status) mdlIndex.data(

				NotesNamespace::StatusRole).value<int>();

		if (id == noteId) {

			mSourceModel->removeRow(mdlIndex.row());

			// Update the note, to-do counts depending on the type.

			if (entryType == AgendaEntry::TypeNote) {

				mNotesCount--;

			} else if (entryType == AgendaEntry::TypeTodo) {

				if (entryStatus == AgendaEntry::TodoCompleted) {

					mCompTodoCount--;

				} else if (entryStatus == AgendaEntry::TodoNeedsAction) {

					mInCompTodoCount--;

				}

			}

			break;

		}

	}

}

/*!

	Populate the model after instance view creation.

 */

void NotesModel::handleInstanceViewCreationCompleted(int status)

{

	Q_UNUSED(status);

	populateSourceModel();

}

/*!

	Modifies the content of a given `row' with the data of the entry given by

	`id'.

	\param id The id of the entry.

	\param row The row corresponding to the given id.

 */

void NotesModel::modifyEntryInModel(ulong id, int row)

{

	// Get the model index.

	QModelIndex modelIndex = mSourceModel->index(row, 0);

	Q_ASSERT(modelIndex.isValid());

	// Fetch the entry

	AgendaEntry entry = mAgendaUtil->fetchById(id);

	Q_ASSERT(!entry.isNull());

	// Set the note id.

	mSourceModel->setData(

			modelIndex, (qulonglong) id, NotesNamespace::IdRole);

	// Set the type of the note.

	mSourceModel->setData(

			modelIndex, entry.type(), NotesNamespace::TypeRole);

	// Set the display data to the index.

	if (AgendaEntry::TypeNote == entry.type()) {

		QString displayText;

		QString dateTimeText;

		QString modifiedText;

		// Read modification time from agenda entry

		QDateTime entryStartDateTime = entry.startTime();

		// If modified on today,show only modified time otherwise show the

		// modified date.

		if ((QDate::currentDate()) == entryStartDateTime.date() ) {

			dateTimeText =

					hbTrId("txt_notes_dblist_note_modified_at_time");

			modifiedText =

					entryStartDateTime.time().toString(timeFormatString());

		} else {

			dateTimeText =

					hbTrId("txt_notes_dblist_note_modified_on_date");

			modifiedText =

					entryStartDateTime.date().toString(dateFormatString());

		}

		displayText = dateTimeText.arg(modifiedText);

		QStringList stringList;

		stringList << entry.description().left(15) << displayText;

		// Set the data.

		mSourceModel->setData(

				modelIndex, stringList, Qt::DisplayRole);

		// Set the favourite icon.

		if (entry.favourite()) {

			QList<QVariant> iconList;

			iconList.append(HbIcon("qtg_small_note"));

			iconList.append(HbIcon("qtg_mono_favourites"));

			mSourceModel->setData(modelIndex, iconList, Qt::DecorationRole);

		} else {

			QList<QVariant> iconList;

			iconList.append(HbIcon("qtg_small_note"));

			iconList.append(QVariant(QVariant::Invalid));

			mSourceModel->setData(modelIndex, iconList, Qt::DecorationRole);

		}

	} else if (AgendaEntry::TypeTodo == entry.type()) {

		QStringList stringList;

		if (entry.summary().isEmpty()) {

			// If empty set unnamed text

			stringList<<hbTrId("txt_notes_dblist_unnamed");

		} else {

			stringList << entry.summary();

		}

		if (AgendaEntry::TodoNeedsAction == entry.status()) {

			// Read due date from agenda entry

			QString displayText;

			QString timeText(hbTrId("txt_notes_dblist_val_due_on_1"));

			QString dueDateText =

					entry.startTime().toString(dateFormatString());

			displayText = timeText.arg(dueDateText);

			stringList << displayText;

		}

		// Set the data.

		mSourceModel->setData(

				modelIndex, stringList, Qt::DisplayRole);

		// Set the to-do done/undone icon based on the status.

		QList<QVariant> iconList;

		if (AgendaEntry::TodoCompleted == entry.status()) {

			iconList.append(HbIcon("qtg_small_todo_done"));

		} else {

			iconList.append(HbIcon("qtg_small_todo"));

		}

		if (1 == entry.priority()) {

			// Set the High Priority icon if priority is high.

			iconList.append(HbIcon("qtg_small_priority_high"));

		} else if (!entry.alarm().isNull()) {

			// Set the alarm if set.

			iconList.append(HbIcon("qtg_mono_alarm"));

		} else {

			iconList.append(QVariant(QVariant::Invalid));

		}

		// Set the icons.

		mSourceModel->setData(modelIndex, iconList, Qt::DecorationRole);

	}

}

/*!

	Appends notes to the model.

	\param ids QList of uids containing the notes.

 */

void NotesModel::appendNotesToModel(QList<AgendaEntry> &agendaEntryList)

{

	int entriesCount = agendaEntryList.count();

	// Iterate and add notes to the model.

	mSourceModel->insertRows(mSourceModel->rowCount(), entriesCount);

	int rowCount = mSourceModel->rowCount();

	for (int idIter = 0, modelIter = rowCount - entriesCount;

			idIter < entriesCount; idIter++, modelIter++) {

		// Read the note details.

		AgendaEntry entry = agendaEntryList[rowCount - 1 - idIter];

		if (AgendaEntry::TypeNote != entry.type()) {

			continue;

		}

		// Create a model index.

		QModelIndex mdlIndex = mSourceModel->index(qAbs(modelIter), 0);

		// Set the note id.

		mSourceModel->setData(

				mdlIndex, (qulonglong) entry.id(), NotesNamespace::IdRole);

		// Set the type of the note.

		mSourceModel->setData(

				mdlIndex, entry.type(), NotesNamespace::TypeRole);

		// Set the favourite property.

		mSourceModel->setData(

				mdlIndex, entry.favourite(), NotesNamespace::FavouriteRole);

		// Set the display data now.

		// Read modification time from agenda entry

		QString displayText;

		QString dateTimeText;

		QString modifiedText;