/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbPlugins module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include <QTimer>

#include <hbinputpredictionengine.h>

#include <hbinputmethod.h>

#include <hbinputkeymap.h>

#include <hbinputkeymapfactory.h>

#include "hbinputabstractbase.h"

#include "hbinputbasicqwertyhandler.h"

#include "hbinputbasichandler_p.h"

class HbInputBasicQwertyHandlerPrivate: public HbInputBasicHandlerPrivate

{

    Q_DECLARE_PUBLIC(HbInputBasicQwertyHandler)

public:

    HbInputBasicQwertyHandlerPrivate();

    ~HbInputBasicQwertyHandlerPrivate();

    void init();

    // button related operations.

    bool buttonPressed(const QKeyEvent *event);

    bool buttonReleased(const QKeyEvent *event);

    void _q_timeout();

public:

    HbFnState mFnState;

    int mButton;

    bool mPreviewAvailable;

    QChar mPrevDeadKey;

    HbInputFocusObject *mCurrentlyFocused;

};

HbInputBasicQwertyHandlerPrivate::HbInputBasicQwertyHandlerPrivate()

:mFnState(HbFnOff),

mButton(0),

mPreviewAvailable(false),

mPrevDeadKey(0),

mCurrentlyFocused(0)

{

}

HbInputBasicQwertyHandlerPrivate::~HbInputBasicQwertyHandlerPrivate()

{

}

void HbInputBasicQwertyHandlerPrivate::init()

{

}

bool HbInputBasicQwertyHandlerPrivate::buttonPressed(const QKeyEvent * event)

{

    if (!mKeymap->isDeadKey(event->key())) {

        mButton = event->key();

        mTimer->start(HbLongPressTimerTimeout);

        mPreviewAvailable = false;

    } 

    return false;

}

bool HbInputBasicQwertyHandlerPrivate::buttonReleased(const QKeyEvent *event)

{

    Q_Q(HbInputBasicQwertyHandler);

    int buttonId = event->key();

    QChar firstChar = 0;

    QChar secondChar = 0;

    // If the timer is not active and it is alpha mode, it is a long press

    // and handled in another function. So just return.

    if (mTimer->isActive()) {

        mTimer->stop();

    } else if (buttonId == Qt::Key_Control) {

        return false;

    } else if (!(buttonId & 0xffff0000) && mPreviewAvailable) {

        return false;

    }

    HbInputFocusObject *focusObject = 0;

    focusObject = mInputMethod->focusObject();

    if (!focusObject) {

        qDebug("HbInputBasicQwertyHandler::virtualButtonClicked : no focused editor widget!");

        return false;

    }

    int currentTextCase = focusObject->editorInterface().textCase();

    const HbMappedKey *mappedKey = mKeymap->keyForKeycode(HbKeyboardVirtualQwerty, event->key());

    QChar newChar;

    if (mFnState == HbFnNext) {

        newChar = (mappedKey->characters(HbModifierFnPressed)).at(0);

        mFnState = HbFnOff;

    } else {

        if (currentTextCase == HbTextCaseLower) {

            if (mappedKey && mappedKey->characters(HbModifierNone).size() > 0) {

                newChar = mappedKey->characters(HbModifierNone).at(0);

            } else {

                newChar = buttonId;

            }

        } else {

            if (mappedKey && mappedKey->characters(HbModifierShiftPressed).size() > 0) {

                newChar = mappedKey->characters(HbModifierShiftPressed).at(0);

            } else {

                newChar = buttonId;

            }

        }

    }

    if (!mPrevDeadKey.isNull()) {

        if (event->key() != Qt::Key_Shift && event->key() != Qt::Key_Alt) {

            mKeymap->combineCharacter(mPrevDeadKey, newChar, firstChar, secondChar );

            mPrevDeadKey = 0;

            if (firstChar.isNull() && secondChar.isNull()) {

                return true;

            }

        }

    } else {

        if (mKeymap->isDeadKey(newChar.unicode())) {

            mPrevDeadKey = newChar.unicode();

            return true;

        } else {

            firstChar = newChar;

        }

    }

    bool ret = false;

    switch(buttonId) {

    case Qt::Key_Alt:

        if (mFnState == HbFnOff) {

            mFnState = HbFnNext;

        } else if (mFnState == HbFnNext) {

            mFnState = HbFnOn;

        } else {

            mFnState = HbFnOff;

        }

        ret = true;

        break;

    case Qt::Key_Shift: {

            HbTextCase currentTextCase = focusObject->editorInterface().textCase();

            HbInputLanguage language = mInputMethod->inputState().language();

            // Update the Case Information in HbInputState, it internally updates in HbEditorInterface as well

            switch(currentTextCase) {

            case HbTextCaseLower:

                // For Case-insensitive languages, Shift Key is used to switch between character sets (i.e lower case characters and shifted characters)

                if(!language.isCaseSensitiveLanguage()){

                    currentTextCase = HbTextCaseUpper; 

                }

                else {

                    currentTextCase = HbTextCaseAutomatic;

                }                                 

                break;

            case HbTextCaseUpper:

                currentTextCase = HbTextCaseLower;                

                break;

            case HbTextCaseAutomatic:

                currentTextCase = HbTextCaseUpper;               

                break;

            default:

                break;

            } 

            HbInputState state = mInputMethod->inputState();

            state.setTextCase(currentTextCase);            

            mInputMethod->activateState(state);

            ret = true;

        }

        break;

    case Qt::Key_Control:   // Ctrl/Chr

        mInputMethod->switchSpecialCharacterTable();

        ret = true;

        break;

    default:

        // let's pass non deadkey event to the base class.

        if (!mKeymap->isDeadKey(firstChar.unicode()) && secondChar.isNull() && q->HbInputBasicHandler::filterEvent(event)) {

            return true;

        }

        if (event->key() == Qt::Key_Delete || event->key() == Qt::Key_Backspace) {

            return false;

        }

        QList<QInputMethodEvent::Attribute> list;

        QString newText;

        // If function key is pressed, get the functionized 

        // character and commit.

        if (mFnState == HbFnNext) {

            if (!mappedKey->characters(HbModifierFnPressed).isEmpty() && focusObject && focusObject->characterAllowedInEditor(mappedKey->characters(HbModifierFnPressed).at(0))) {

                QInputMethodEvent event(QString(), list);

                event.setCommitString(QString(mappedKey->characters(HbModifierFnPressed).at(0)));

                focusObject->sendEvent(event);

            }

            mFnState = HbFnOff;

            return true;

        }

        if (!firstChar.isNull()){

            q->commitAndUpdate(firstChar); 

            if (!secondChar.isNull() ) {

                if (!q->HbInputBasicHandler::filterEvent(event)) {

                    q->commitAndUpdate(secondChar);

                }

            }

            // Need to refresh the autocompletion list

            refreshAutoCompleter();

            ret = true;

        }

        break;

    }

    return ret;

}

void HbInputBasicQwertyHandlerPrivate::_q_timeout()

{

    mTimer->stop();

    //If long key press of shift key is received, just return

    if (mButton == Qt::Key_Shift) {

        return;

    } else if (mButton == Qt::Key_Control) {

        mInputMethod->selectSpecialCharacterTableMode();

    }

    QStringList spellList;

    //If long key press of shift key, space key and enter key is received, don't

    if (mButton) {

        mInputMethod->launchCharacterPreviewPane(mButton);

    }

    return;

}

HbInputBasicQwertyHandler::HbInputBasicQwertyHandler(HbInputAbstractMethod* inputMethod)

:HbInputBasicHandler(* new HbInputBasicQwertyHandlerPrivate, inputMethod)

{

    Q_D(HbInputBasicQwertyHandler);

    d->q_ptr = this;

    d->init();

}

HbInputBasicQwertyHandler::~HbInputBasicQwertyHandler()

{

}

/*!

filterEvent function key handling.

*/

bool HbInputBasicQwertyHandler::filterEvent(const QKeyEvent* event)

{

    Q_D(HbInputBasicQwertyHandler);

    if (event->type() == QEvent::KeyRelease) {

        return d->buttonReleased(event);

    } else {

        return d->buttonPressed(event);

    }

}

/*!

returns true if in inline edit.

*/

bool HbInputBasicQwertyHandler::isComposing() const

{   

    Q_D(const HbInputBasicQwertyHandler);

    return d->mTimer->isActive();

}

/*!

Action handler

*/

bool HbInputBasicQwertyHandler::actionHandler(HbInputModeAction action)

{

    Q_D(HbInputBasicQwertyHandler);

    HbInputFocusObject *focusObject = 0;

    focusObject = d->mInputMethod->focusObject();

    bool ret = true;

    switch (action) {

    case HbInputModeActionCancelButtonPress:

    case HbInputModeActionReset:

        if (d->mTimer->isActive()) {

            d->mTimer->stop();

        }

        break;

    case HbInputModeActionFocusRecieved:

        if (d->mTimer->isActive()) {

            d->mTimer->stop(); 

        }

        // set up auto completer

        setUpAutoCompleter();

    break;

    case HbInputModeActionFocusLost:

        // We should add the commit autocompleting text when focus lost happens

         if (d->mTimer->isActive()) {

            d->mTimer->stop(); 

        }

        if (d->mCurrentlyFocused != focusObject) {

            d->mCurrentlyFocused = focusObject;

            addWordInAutoCompleter();

        } 

    break;

    default: {

        ret = HbInputBasicHandler::actionHandler(action);

        }

    }

    return ret;

}

/*!

this SLOT is called by input plugin when there is a character selected from character preview pane.

*/

void HbInputBasicQwertyHandler::charFromPreviewSelected(QString characters)

{

    Q_D(HbInputBasicQwertyHandler);

    if(characters.size() > 0) {

        sctCharacterSelected(characters.at(0));

        d->mInputMethod->updateState();

    }

}

void HbInputBasicQwertyHandler::sctCharacterSelected(QString character)

{

    HbInputModeHandler::sctCharacterSelected(character);

}

void HbInputBasicQwertyHandler::characterPreviewAvailable(bool available)

{

    Q_D(HbInputBasicQwertyHandler);

    d->mPreviewAvailable = available;

}