/****************************************************************************
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 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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 ** This file is part of the tools applications of the Qt Toolkit.
 **
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 ** 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.
 **
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 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
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 ** Alternatively, this file may be used in accordance with the terms and
 ** conditions contained in a signed written agreement between you and Nokia.
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 ** $QT_END_LICENSE$
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 ****************************************************************************/

#include "screenreader.h"
#include "optionswidget.h"
#include "accessibilityscenemanager.h"
#include <QtGui>

#ifdef Q_OS_MAC
#include <private/qt_mac_p.h>
#endif

ScreenReader::ScreenReader(QObject *parent) :
    QObject(parent)
{
    m_selectedInterface = 0;
    m_rootInterface = 0;
    bool activateCalled = false;
}

ScreenReader::~ScreenReader()
{
    delete m_selectedInterface;
    delete m_rootInterface;
}

void ScreenReader::setRootObject(QObject *rootObject)
{
    m_rootInterface = QAccessible::queryAccessibleInterface(rootObject);
}

void ScreenReader::setOptionsWidget(OptionsWidget *optionsWidget)
{
    m_optionsWidget = optionsWidget;
}

void ScreenReader::touchPoint(const QPoint &point)
{
    qDebug() << "touch" << point;
    // Wait and see if this touch is the start of a double-tap
    // (activate will then be called and cancel the touch processing)
    m_activateCalled = false;
    m_currentTouchPoint = point;
    QTimer::singleShot(200, this, SLOT(processTouchPoint()));
}

void ScreenReader::processTouchPoint()
{
    if (m_activateCalled) {
        return;
    }

    if (m_rootInterface == 0) {
        return;
    }

    QAccessibleInterface * currentInterface = m_rootInterface;

    int hit = -2;
    int guardCounter = 0;
    const int guardMax = 40;
    while (hit != 0) {
        ++guardCounter;
        if (guardCounter > guardMax) {
            qDebug() << "touchPoint exit recursion overflow";
            return; // outside
        }

        hit = currentInterface->childAt(m_currentTouchPoint.x(), m_currentTouchPoint.y());
        //qDebug() << "hit" << hit;
        if (hit == -1) {
            return; // outside
        } else if (hit == 0) {
            break; // found it.
        } else {
            QAccessibleInterface *childInterface = 0;
            int child = currentInterface->navigate(QAccessible::Child, hit, &childInterface);
            if (childInterface == 0) {
                return; // navigation error
            }

            if (currentInterface != m_rootInterface)
                delete currentInterface;
            currentInterface = childInterface;
        }
    }

    m_selectedInterface = currentInterface;
    emit selected(m_selectedInterface->object());
    if (m_optionsWidget->enableTextToSpeach())
        speak(m_selectedInterface->text(QAccessible::Name)
              /*+ "," + translateRole(m_selectedInterface->role(0)) */);

//    qDebug() << "touchPoint exit found" << m_selectedInterface->text(QAccessible::Name, 0) << m_selectedInterface->object() << m_selectedInterface->rect(0);
}

void ScreenReader::activate()
{
    qDebug() << "ScreenReader::activate";
    m_activateCalled = true;
    if (m_selectedInterface) {
        m_selectedInterface->actionInterface()->doAction(QAccessibleActionInterface::pressAction());
    }
}

#ifdef Q_OS_MAC

    // screenreader.mm

#else

void ScreenReader::speak(const QString &text, const QString &/*voice*/)
{
    QFile f("festivalspeachhack");
    f.open(QIODevice::WriteOnly);
    f.write(text.toLocal8Bit());
    f.close();

    QProcess *process = new QProcess;
    process->start("/usr/bin/festival", QStringList() << "--tts" << "festivalspeachhack");
}

#endif