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

**

** 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 <QTextCharFormat>

#include <QTimer>

#include <hbinputsettingproxy.h>

#include <hbinputkeymapfactory.h>

#include <hbinputkeymap.h>

#include <hbinpututils.h>

#include "hbinputmodehandler.h"

#include "hbinputmodehandler_p.h"

#include "hbinputabstractbase.h"

HbInputModeHandlerPrivate::HbInputModeHandlerPrivate()

:mKeymap(0),

mInputMethod(0),

mTimer(0)

{

}

HbInputModeHandlerPrivate::~HbInputModeHandlerPrivate()

{

}

void HbInputModeHandlerPrivate::init()

{

    Q_Q(HbInputModeHandler);

    mTimer = new QTimer(q);

    q->connect(mTimer, SIGNAL(timeout()), q, SLOT(_q_timeout()));

}

// A virtual timeout function mode handlers should implement this slot.

void HbInputModeHandlerPrivate::_q_timeout()

{

}

QString HbInputModeHandlerPrivate::surroundingText()

{

    if (mInputMethod->focusObject()) {

        return mInputMethod->focusObject()->editorSurroundingText();

    }

    return QString();

}

int HbInputModeHandlerPrivate::cursorPosition()

{

    if (mInputMethod->focusObject()) {

       return mInputMethod->focusObject()->editorCursorPosition();

    }

    return -1;

}

void HbInputModeHandlerPrivate::getAndFilterCharactersBoundToKey(QStringList &spellList, Qt::Key key)

{

    HbInputFocusObject *focusObject = mInputMethod->focusObject();

    spellList.clear();

    // Get the functionized character

    const HbMappedKey* mappedKey = mKeymap->keyForKeycode(mInputMethod->inputState().keyboard(), key);

    if (!mappedKey) {

        return;

    }

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

        spellList.append(mappedKey->characters(HbModifierFnPressed).at(0));

    }

    // Get the characters mapped to the key.

    HbInputState inputState = mInputMethod->inputState();

    HbTextCase textCase = inputState.textCase();

    HbModifiers modifiers = HbModifierNone;

    if (textCase == HbTextCaseUpper || textCase == HbTextCaseAutomatic) {

        modifiers |= HbModifierShiftPressed;

    }

    for (int i=0; i < mappedKey->characters(modifiers).length(); i++) {

        if (focusObject && focusObject->characterAllowedInEditor(mappedKey->characters(modifiers).at(i))) {

            spellList.append(mappedKey->characters(modifiers).at(i));

        }

    }

}

void HbInputModeHandlerPrivate::updateTextCase()

{

    HbInputState nextState = mInputMethod->inputState();

    HbTextCase nextCase = HbTextCaseNone;

    switch(nextState.textCase()) {

        case HbTextCaseLower:

            // In multiline editor, if enter char is input and then shift is pressed twice,

            // the case should be reverted to automatic.

            if (mInputMethod->automaticTextCaseNeeded()) {

                nextCase = HbTextCaseAutomatic;

            } else {

                nextCase = HbTextCaseUpper;

            }

            break;

        case HbTextCaseUpper:

        case HbTextCaseAutomatic:

            nextCase = HbTextCaseLower;

            break;

        default:

            break;

        }

        nextState.setTextCase(nextCase);

        mInputMethod->activateState(nextState);

}

bool HbInputModeHandlerPrivate::isEnterCharacter(QChar character)

{

    if (character == 0x21B2 || character == 0x21b3) {

        return true;

    }

    return false;

}

HbInputModeHandler::HbInputModeHandler(HbInputModeHandlerPrivate &dd, HbInputAbstractMethod* inputMethod)

    :d_ptr(&dd)

{

    Q_D(HbInputModeHandler);

    d->q_ptr = this;

    d->init();

    d->mInputMethod = inputMethod;

}

HbInputModeHandler::~HbInputModeHandler()

{

    delete d_ptr;

}

/*!

 Gateway for all the mode handlers.

*/

bool HbInputModeHandler::filterEvent(const QEvent * event)

{

    if (event) {

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

            const QKeyEvent *keyEvent = static_cast<const QKeyEvent *>(event);

            return filterEvent(keyEvent);

		}

	}

    return false;

}

/*!

 This function handles the most common key events.

*/

bool HbInputModeHandler::filterEvent(const QKeyEvent * event)

{

    Q_UNUSED(event);

    return false;

}

/*!

 Action hanlder. Currently it handles only keymapping loading.

*/

bool HbInputModeHandler::actionHandler(HbInputModeAction action)

{

    Q_D(HbInputModeHandler);

    switch (action) {

    case HbInputModeActionInit:

        if (d->mKeymap) {

            break;

        }

    case HbInputModeActionPrimaryLanguageChanged: {

        HbInputLanguage primaryLanguage = HbInputSettingProxy::instance()->globalInputLanguage();

        d->mKeymap = HbKeymapFactory::instance()->keymap(primaryLanguage);

        if (!d->mKeymap) {

            qDebug(" HbInputModeHandler::actionHandler --> Failed to get keymapData!!!");

            return false;

        }

        }

        break;

    case HbInputModeActionDeleteAndCommit: {

        HbInputFocusObject *focusObject = 0;

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

        if (focusObject && focusObject->editorCursorPosition()) {

            QString empty;

            QList<QInputMethodEvent::Attribute> list;

            QInputMethodEvent event(QString(), list);

            event.setCommitString(empty, -1, 1);

            sendAndUpdate(event);

        }

        break;

        }

    default :

        return false;

    };

    return true;

}

/*!

Call-back implementation to indicate that a character was selected from the SCT. With this, the character is committed to the

editor and editor is again made to focus.

*/

void HbInputModeHandler::sctCharacterSelected(QString aChar)

{

    commitAndUpdate(aChar);

}

void HbInputModeHandler::smileySelected(QString smiley)

{

    Q_D(HbInputModeHandler);

    HbInputFocusObject *focusObject = 0;

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

    if (!focusObject) {

        qDebug("HbInputModeHandler::smileySelected no focusObject ... failed!!");

        return ;

    }

    QStringList patterns = focusObject->editorInterface().smileyTheme().patterns(smiley);

        QString filtered;

        focusObject->filterStringWithEditorFilter(string, filtered);

        if (filtered == string) {

            focusObject->commitSmiley(smiley);

            break;

        }

    }

    d->mInputMethod->updateState();

}

void HbInputModeHandler::cursorPositionChanged(int oldPos, int newPos)

{

    Q_D(HbInputModeHandler);

    d->mInputMethod->updateState();

    Q_UNUSED(oldPos);

    Q_UNUSED(newPos);

}

/*!

 this function commits the first number found in the key.

*/

void HbInputModeHandler::commitFirstMappedNumber(int key, HbKeyboardType type)

{

    Q_D(HbInputModeHandler);

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

    // This is long key press number shortcut functionality.

    if (!d->mKeymap) {

        d->mKeymap = HbKeymapFactory::instance()->keymap(language);

    }

	bool isNumericEditor = d->mInputMethod->focusObject()->editorInterface().isNumericEditor();

	HbInputDigitType digitType = HbInputUtils::inputDigitType(language);

	if (isNumericEditor) {

        QLocale::Language systemLanguage = QLocale::system().language();		 

		if (language.language() != systemLanguage) {

            digitType = HbDigitTypeLatin;

	 	}

	}	

    QChar numChr = HbInputUtils::findFirstNumberCharacterBoundToKey(

        d->mKeymap->keyForKeycode(type, key), language, digitType);

	// when a number is to be entered, it should commit 

    // the previous string and then append the number to the string

    if (numChr != 0) {

        commitAndAppendString(numChr);

    }

}

/*!

Gets the character at index in a key and incriments the index by 1. Returns the Zeroth character if

this function finds the index to be out of range and incriments index to 1.

*/

QChar HbInputModeHandler::getNthCharacterInKey(int &index, int key, HbKeyboardType type)

{

    Q_D(HbInputModeHandler);

    HbModifiers modifiers = 0;

    int textCase = d->mInputMethod->inputState().textCase();

    if (type != HbKeyboardSctPortrait && (textCase == HbTextCaseUpper || textCase == HbTextCaseAutomatic)) {

        modifiers |= HbModifierShiftPressed;

    }

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

    if (!d->mKeymap) {

        d->mKeymap = HbKeymapFactory::instance()->keymap(language);

    }

    const HbMappedKey* mappedKey = d->mKeymap->keyForKeycode(type, key);

    if (!mappedKey) {

        return 0;

    }

    QString chars = mappedKey->characters(modifiers);

	// check whether current input language supports native digits. if yes, replace latin digits with native digits    

    for (int i = 0; i < chars.length(); i++) {

        if (chars.at(i) >= '0' && chars.at(i) <= '9') {

            chars = chars.replace(chars.at(i), HbInputUtils::findFirstNumberCharacterBoundToKey(mappedKey,

				language, HbInputUtils::inputDigitType(language)));

        }		

    }		

    // We need to see which of the characters in keyData are allowed to the editor.

    // this looks like expensive operation, need to find out a better way/place to do it.

    QString allowedChars = chars;

    HbInputFocusObject *focusedObject = d->mInputMethod->focusObject();

    if(focusedObject) {

        focusedObject->filterStringWithEditorFilter(chars,allowedChars);

    } 

    QChar character = 0;

    if (!allowedChars.isNull()) {

        if (index >= allowedChars.length() || index < 0) {

            index = 0;

        }

        character = allowedChars.at(index);

        index++;

    }

    return character;

}

/*!

    This function gets all the characters bound to a key and filters those character based on the editor.

*/

void HbInputModeHandler::getAndFilterCharactersBoundToKey(QStringList &spellList, Qt::Key key)

{

    Q_D(HbInputModeHandler);

    d->getAndFilterCharactersBoundToKey(spellList, key);

}

/*!

    A virtual function, this should be called from plugin when ever there is mouse event.

*/

void HbInputModeHandler::mouseHandler(int x, QMouseEvent* mouseEvent)

{

    Q_UNUSED(mouseEvent);

    Q_D(HbInputModeHandler);

    if(d->cursorPosition() != x) {

        actionHandler(HbInputModeActionCommit);

    }

}

/*!

    A virtual function, default implementation first commits any inline text by calling actionHandler with

    HbInputModeActionCommit. Then commits the string.

*/

void HbInputModeHandler::commitAndAppendString(const QString& string)

{

    // first commit the pre-edit string if any.

    actionHandler(HbInputModeActionCommit);

    commitAndUpdate(string);

}

/*!

Ignores currently active pre-edit text if any and directly commits the passed string in to the editor. This

function also updates the inputmethod state.

*/

void HbInputModeHandler::commitAndUpdate(const QString& string, int replaceFrom, int replaceLength, bool isAsync)

{

    Q_D(HbInputModeHandler);

    HbInputFocusObject *focusObject = 0;

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

    if (!focusObject) {

        qDebug("HbInputModeHandler::commitAndUpdate no focusObject ... failed!!");

        return ;

    }

    QString filtered;

    focusObject->filterStringWithEditorFilter(string, filtered);

    // now commit the string which is passed in.

    QList<QInputMethodEvent::Attribute> list;

    if(isAsync) {

        QInputMethodEvent *event = new QInputMethodEvent(QString(), list);

        event->setCommitString(filtered, replaceFrom, replaceLength);

        focusObject->postEvent(*event);

    } else {

        QInputMethodEvent event;

        event.setCommitString(filtered, replaceFrom, replaceLength);

        focusObject->sendEvent(event);

    }

    d->mInputMethod->updateState();

}

/*!

Sends the passed event to the focused object and upates the inputmethod state.

*/

void HbInputModeHandler::sendAndUpdate(QEvent& event)

{

    Q_D(HbInputModeHandler);

    HbInputFocusObject *focusObject = 0;

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

    if (!focusObject) {

        qDebug("HbInputModeHandler::sendAndUpdate no focusObject ... failed!!");

        return;

    }

    focusObject->sendEvent(event);

    d->mInputMethod->updateState();

}

void HbInputModeHandler::setKeymap(const HbKeymap* keymap)

{

    Q_D(HbInputModeHandler);

    d->mKeymap = keymap;

}

/*!

Toggles prediction after doing a check if the editor allows it.

*/

void HbInputModeHandler::togglePrediction()

{

    Q_D(HbInputModeHandler);

    bool currentStatus = HbInputSettingProxy::instance()->predictiveInputStatusForActiveKeyboard();

    HbInputFocusObject* focusedObject = 0;

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

    bool isPredictionAllowed = focusedObject->editorInterface().isPredictionAllowed();

    if (currentStatus) {

        HbInputSettingProxy::instance()->setPredictiveInputStatusForActiveKeyboard(false);

    } else if (isPredictionAllowed) {

        HbInputSettingProxy::instance()->setPredictiveInputStatusForActiveKeyboard(true);

    }

}

#include "moc_hbinputmodehandler.cpp"

// EOF