/*

* 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"

static const int DefaultViewportWidth = 640;

static const int DefaultViewportHeight = 640;

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 = 5.;

namespace GVA {

ViewportMetaData::ViewportMetaData()

{

    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;

}

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;

    return *this;

}

ViewportMetaData::~ViewportMetaData()

{}

void ViewportMetaData::adjustViewportData(const QRect& clientRect)

{

    //Data updated from viewport tag

    m_isValid = true;

    //Adjust viewport dimensions

    m_width = qBound(MinViewportWidth, m_width, MaxViewportWidth);

    m_height = qBound(MinViewportHeight, m_height, MaxViewportHeight);

    //Aspect ratio

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

    if (m_width != DefaultViewportWidth && m_height == DefaultViewportHeight) {

        //Width has been specified. Adjust height, min scale and max scale

        m_height = m_width * (1 / aspectRation);

    } else if (m_width == DefaultViewportWidth && m_height != DefaultViewportHeight) {

        //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);

    }

    //Adjust zoom limits

    adjustZoomValues(clientRect);

}

void ViewportMetaData::updateViewportData(const QSize& newContentSize, const QRect& clientRect)

{

    //If still viewport tag has not been parsed

    //Do not update values.

    if(!m_isValid)

        return;

    //Update with viewport dimensions

    m_width = qBound(MinViewportWidth, newContentSize.width(), MaxViewportWidth);

    m_height = qBound(MinViewportHeight, newContentSize.height(), MaxViewportHeight);

    //Adjust zoom limits

    adjustZoomValues(clientRect);

}

void ViewportMetaData::orientationChanged(const QRect& 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, MaxViewportWidth);

    m_height = qBound(MinViewportHeight, m_height, MaxViewportHeight);

}

bool ViewportMetaData::isLayoutNeeded()

{

    if (!isUserSpecifiedWidth() || !isUserSpecifiedHeight())

        return true;

    return false;

}

void ViewportMetaData::initialize()

{

    m_initialScale = ValueUndefined;

    m_minimumScale = DefaultMinScale;

    m_maximumScale = DefaultMaxScale;

    m_width = DefaultViewportWidth;

    m_height = DefaultViewportHeight;

    m_userScalable = true;

    m_isValid = false;

    //Clear user defined scales

    setFlag(UserDefinedMinumumScale, false);

    setFlag(UserDefinedMaximumScale, false);

    setFlag(UserDefinedInitialScale, false);

}

void ViewportMetaData::adjustZoomValues(const QRect& clientRect)

{

    qreal fitToWidthZoom = (qreal)clientRect.width() / m_width;

    fitToWidthZoom = qBound(DefaultMinScale, fitToWidthZoom, DefaultMaxScale);

    m_maximumScale = qBound(fitToWidthZoom, m_maximumScale, DefaultMaxScale);

    //Adjust minimum-sclae

    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;

    //Turn off zooming if min and max zoom are same

    if (m_minimumScale == m_maximumScale)

        m_userScalable = false;

}

//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