/*
* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, version 2.1 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not,
* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".
*
* Description:
*
*/

#include "ViewportMetaData.h"
#include <QApplication>
#include <QDesktopWidget>
#include "WebGestureHelper.h"


static const int MinViewportWidth = 200;
static const int MaxViewportWidth = 10000;
static const int MinViewportHeight = 200;
static const int MaxViewportHeight = 10000;
static const qreal DefaultMinScale = 0.2;
static const qreal DefaultMaxScale = 3.;
static const qreal DefaultPageLayoutScale = 0.667;

namespace GVA {

ViewportMetaData::ViewportMetaData()
{
    #ifndef Q_WS_MAEMO_5
    QRect screenGeom = browserApp->mainWindow()->geometry();
    m_defaultViewportWidth = screenGeom.width();
    m_defaultViewportHeight = screenGeom.height();
    #else
    m_defaultViewportWidth = 700;
    m_defaultViewportHeight = 400;
    #endif
    m_maxViewportWidth = m_defaultViewportWidth;
    m_maxViewportHeight = m_defaultViewportHeight;
    initialize();
}

ViewportMetaData::ViewportMetaData(const ViewportMetaData& other)
{
    m_initialScale = other.m_initialScale;
    m_minimumScale = other.m_minimumScale;
    m_maximumScale = other.m_maximumScale;
    m_width = other.m_width;
    m_height = other.m_height;
    m_userScalable = other.m_userScalable;
    m_isValid = other.m_isValid;
    m_scaleLimits = other.m_scaleLimits;
    m_specifiedData.m_width = other.m_specifiedData.m_width;
    m_specifiedData.m_height = other.m_specifiedData.m_height;
    m_specifiedData.m_minScale = other.m_specifiedData.m_minScale;
#ifdef VIEWPORT_ALWAYS_ALLOW_ZOOMING
    m_userScalableOverRidden = other.m_userScalableOverRidden;
#endif
}

ViewportMetaData& ViewportMetaData::operator=(const ViewportMetaData& other)
{
    m_initialScale = other.m_initialScale;
    m_minimumScale = other.m_minimumScale;
    m_maximumScale = other.m_maximumScale;
    m_width = other.m_width;
    m_height = other.m_height;
    m_userScalable = other.m_userScalable;
    m_isValid = other.m_isValid;
    m_scaleLimits = other.m_scaleLimits;
    m_specifiedData.m_width = other.m_specifiedData.m_width;
    m_specifiedData.m_height = other.m_specifiedData.m_height;
    m_specifiedData.m_minScale = other.m_specifiedData.m_minScale;
#ifdef VIEWPORT_ALWAYS_ALLOW_ZOOMING
    m_userScalableOverRidden = other.m_userScalableOverRidden;
#endif

    return *this;
}

ViewportMetaData::~ViewportMetaData()
{}

QSize ViewportMetaData::getSpecifiedSize() const
{
    QSize ret(m_maxViewportWidth / DefaultPageLayoutScale,
              m_maxViewportHeight / DefaultPageLayoutScale);
    if(m_initialScale > 0)
        ret = QSize(m_maxViewportWidth / m_initialScale,
                    m_maxViewportHeight / m_initialScale);

    // assign specified data and swap if necessary
    if(!m_specifiedData.m_width.isEmpty() && m_specifiedData.m_width != "device-width") {

        if(m_specifiedData.m_width == "device-height")
            ret.setWidth(m_maxViewportHeight);
        else
            ret.setWidth(m_specifiedData.m_width.toInt());
    }

    if(!m_specifiedData.m_height.isEmpty() && m_specifiedData.m_height != "device-height") {
        if(m_specifiedData.m_height == "device-width")
            ret.setHeight(m_maxViewportWidth);
        else
            ret.setHeight(m_specifiedData.m_height.toInt());
    }

    return ret;
}

void ViewportMetaData::adjustViewportData(const QSizeF& clientRect)
{
    //Data updated from viewport tag
    m_isValid = true;

    m_maxViewportWidth = clientRect.width();
    m_maxViewportHeight = clientRect.height();

    QSize s = getSpecifiedSize();

//    if((m_maxViewportWidth > m_maxViewportHeight && m_width < m_height) ||
//       (m_maxViewportWidth < m_maxViewportHeight && m_width > m_height))
//        qSwap(m_width,m_height);

/*
    //Adjust viewport dimensions
    m_width = qBound(MinViewportWidth, m_width, m_maxViewportWidth);
    m_height = qBound(MinViewportHeight, m_height, m_maxViewportHeight);

    //Aspect ratio
    qreal aspectRation = (qreal)clientRect.width() / clientRect.height();

    if (m_width != m_maxViewportWidth && m_height == m_maxViewportHeight) {
        //Width has been specified. Adjust height, min scale and max scale
        m_height = m_width * (1 / aspectRation);
    } else if (m_width == m_maxViewportWidth && m_height != m_maxViewportHeight) {
        //Height has been specified. Adjust width, min scale and max scale
        m_width = m_height * aspectRation;
    } else {
        //Putting below code under seperate 'else' to make it readable!
        m_height = m_width * (1 / aspectRation);
    }
*/
    m_width = qBound(MinViewportWidth, s.width(), m_maxViewportWidth);
    m_height = qBound(MinViewportHeight, s.height(), m_maxViewportHeight);
}


void ViewportMetaData::orientationChanged(const QSizeF& newClientRect)
{
    /*
    //If still viewport tag has not been parsed
    //Do not update values.
    if(!m_isValid)
        return;

    //Aspect ratio
    qreal aspectRation = (qreal)newClientRect.width() / newClientRect.height();

    //Update with viewport dimensions
    if (m_specifiedData.m_width.length()) {
        if (QString::compare(m_specifiedData.m_width, "device-width", Qt::CaseInsensitive) == 0)
            m_width = newClientRect.width();
        else if(QString::compare(m_specifiedData.m_width, "device-height", Qt::CaseInsensitive) == 0)
            m_width = newClientRect.height();

        m_height = m_width * (1 / aspectRation);
    }

    //Check if width has not bee specified.
    if (!m_specifiedData.m_width.length()) {
        if (QString::compare(m_specifiedData.m_height, "device-width", Qt::CaseInsensitive) == 0)
            m_height = newClientRect.width();
        else if(QString::compare(m_specifiedData.m_height, "device-height", Qt::CaseInsensitive) == 0)
            m_height = newClientRect.height();

        m_width = m_height * aspectRation;
    }

    //Update with bounds
    //m_width = qBound(MinViewportWidth, m_width, m_maxViewportWidth);
    //m_height = qBound(MinViewportHeight, m_height, m_maxViewportHeight);
     
     */

    m_width = newClientRect.height();
    m_height = newClientRect.width();

}

bool ViewportMetaData::isLayoutNeeded()
{
    if (!isUserSpecifiedWidth() || !isUserSpecifiedHeight())
        return true;
    return false;
}
void ViewportMetaData::initialize()
{
    m_initialScale = ValueUndefined;
    m_minimumScale = DefaultMinScale;
    m_maximumScale = DefaultMaxScale;
    m_width = m_maxViewportWidth; //m_defaultViewportWidth;
    m_height = m_maxViewportHeight; //m_defaultViewportHeight;
    m_userScalable = true;
    m_isValid = false;
#ifdef VIEWPORT_ALWAYS_ALLOW_ZOOMING
    m_userScalableOverRidden = false;
#endif

    //Clear user defined scales
    setFlag(UserDefinedMinumumScale, false);
    setFlag(UserDefinedMaximumScale, false);
    setFlag(UserDefinedInitialScale, false);
    m_specifiedData.m_minScale = -1;
}

void ViewportMetaData::adjustZoomValues(const QSizeF& contentSize)
{
    qreal fitToWidthZoom = m_width / (qreal)contentSize.width();
    fitToWidthZoom = qBound(DefaultMinScale, fitToWidthZoom, DefaultMaxScale);

    m_maximumScale = qBound(fitToWidthZoom, m_maximumScale, DefaultMaxScale);

    //Adjust minimum-scale
    if (getFlag(UserDefinedMinumumScale)) {
        m_minimumScale = m_specifiedData.m_minScale;
        m_minimumScale = qBound(fitToWidthZoom, m_minimumScale, m_maximumScale);
    }
    else
        m_minimumScale = fitToWidthZoom;

    //Adjust initial-scale
//    if (getFlag(UserDefinedInitialScale))
//        m_initialScale = qBound(m_minimumScale, m_initialScale, m_maximumScale);
//    else
//        m_initialScale = m_minimumScale;

#ifdef VIEWPORT_ALWAYS_ALLOW_ZOOMING
    if (m_minimumScale == m_maximumScale) {
        m_minimumScale = DefaultMinScale;
        m_maximumScale = DefaultMaxScale;
        if(!m_userScalable) {
            m_userScalable = true;
            m_userScalableOverRidden = true;
        }
    }
#else
    //Turn off zooming if min and max zoom are same
    if (m_minimumScale == m_maximumScale)
        m_userScalable = false;
#endif
}


//FIX ME : Merge below functions to single. Now in Hurry!!
bool ViewportMetaData::isUserSpecifiedWidth()
{
    if (m_specifiedData.m_width.length()) {
        if (!QString::compare(m_specifiedData.m_width, "device-width", Qt::CaseInsensitive)
            || !QString::compare(m_specifiedData.m_width, "device-height", Qt::CaseInsensitive))
            return false;
    }
    return true;
}

bool ViewportMetaData::isUserSpecifiedHeight()
{
    if (m_specifiedData.m_height.length()) {
        if (!QString::compare(m_specifiedData.m_height, "device-width", Qt::CaseInsensitive)
            || !QString::compare(m_specifiedData.m_height, "device-height", Qt::CaseInsensitive))
            return false;
    }
    return true;
}

}//namespace GVA