/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include <QPair>

#include <QtXml>

#include <QFile>

#include "cxutils.h"

#include "cxuienums.h"

#include "cxuisettingxmlreader.h"

#include "cxuisettingradiobuttonlist.h"

using namespace CxUiSettings;

namespace

{

    static const char *TAG_ROOT                           = "cxui";

    static const char *TAG_SETTINGS                       = "settings";

    static const char *TAG_SETTING_LIST                   = "setting_list";

    static const char *TAG_SETTING_SLIDER                 = "setting_slider";

    static const char *TAG_ITEM                           = "item";

    static const char *TAG_ITEM_VARIANT                   = "lnItem";

    static const char *TAG_SETUP                          = "setup";

    static const char *ATTRIBUTE_ID                       = "id";

    static const char *ATTRIBUTE_HEADING                  = "heading";

    static const char *ATTRIBUTE_PREVIEW                  = "preview";

    static const char *ATTRIBUTE_LISTBOXTYPE              = "type";

    static const char *ATTRIBUTE_HEADING_ICON             = "setting_icon";

    static const char *ATTRIBUTE_ICON                     = "icon";

    static const char *ATTRIBUTE_VALUE                    = "value";

    static const char *ATTRIBUTE_LOCALIZATION_ID          = "string";

    static const char *ATTRIBUTE_LOCALIZATION_ID_LN_VALUE = "lnValue";

    static const char *ATTRIBUTE_SLIDER_MIN               = "min";

    static const char *ATTRIBUTE_SLIDER_MAX               = "max";

    static const char *ATTRIBUTE_SLIDER_STEP              = "step";

    // possible values that can be used in xml for "ATTRIBUTE_LISTBOXTYPE"

    static const char *SINGLE_LINE_LISTBOX                = "SingleLineListBox";

    static const char *TWO_LINE_LISTBOX                   = "TwoLineListBox";

}

CxuiSettingXmlReader::CxuiSettingXmlReader()

  : mXmlUri(),

    mParsed(false),

    mListParams(),

    mSliderParams()

{

}

CxuiSettingXmlReader::~CxuiSettingXmlReader()

{

    clear();

}

/*!

* Get the settings info based on the setting id

* @param setting denotes the setting key id.

* @param Returns list of settings specific to radiobuttonlist.

* @return Were the params found, i.e. is the setting supported.

*/

CxUiSettings::RadioButtonListParams CxuiSettingXmlReader::getListSettingInfo(const QString &setting, bool &found)

{

    CX_DEBUG_ENTER_FUNCTION();

    RadioButtonListParams p;

    // Parse current XML file now if not already done.

    parse();

    if (mListParams.contains(setting)){

        CX_ASSERT_ALWAYS(mListParams.value(setting));

        p = *mListParams.value(setting);

        found = true;

    } else {

        found = false;

    }

    CX_DEBUG_EXIT_FUNCTION();

    return p;

}

/*!

* Get the settings info based on the setting id

* @param setting Denotes the setting key id.

* @param found Were the params found, i.e. is the setting supported.

* @return Returns list of settings specific to slider setting.

*/

CxUiSettings::SliderParams CxuiSettingXmlReader::getSliderSettingInfo(const QString &setting, bool &found)

{

    CX_DEBUG_ENTER_FUNCTION();

    SliderParams p;

    // Parse current XML file now if not already done.

    parse();

    if (mSliderParams.contains(setting)){

        CX_ASSERT_ALWAYS(mSliderParams.value(setting));

        p = *mSliderParams.value(setting);

        found = true;

    } else {

        found = false;

    }

    CX_DEBUG_EXIT_FUNCTION();

    return p;

}

/*!

* Set new source for setting XML.

* @param uri URI for the setting XML. Note: Currently only local file path is supported.

*/

void CxuiSettingXmlReader::setXmlSource(const QString& uri)

{

    CX_DEBUG_ENTER_FUNCTION();

    CX_DEBUG(("Settings mapping XML: XML source set to [%s]", uri.toAscii().constData()));

    if(mXmlUri.compare(uri) != 0) {

        // Clear any old content and set flag that parsing needs to be done again.

        clear();

        mXmlUri = uri;

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Clear existing setting info and raise flag for needed parsing.

*/

void CxuiSettingXmlReader::clear()

{

    CX_DEBUG_ENTER_FUNCTION();

    mParsed = false;

    qDeleteAll(mListParams.values());

    mListParams.clear();

    qDeleteAll(mSliderParams.values());

    mSliderParams.clear();

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Parses the XML and creates all settings list defined in XML

*/

void CxuiSettingXmlReader::parse()

{

    CX_DEBUG_ENTER_FUNCTION();

    if (mParsed) {

        CX_DEBUG(("Settings mapping XML: Already parsed our XML, using cached content") );

        CX_DEBUG_EXIT_FUNCTION();

        return;

    }

    QDomDocument document("dummy");

    QFile file(mXmlUri);

    if (!file.open(QFile::ReadOnly|QFile::Text)) {

        CX_DEBUG(("Settings mapping XML: could not open file [%s]", mXmlUri.toAscii().constData()));

        return;

    }

    bool ok = document.setContent(&file);

    file.close();

    if (!ok) {

        CX_DEBUG(("Settings mapping XML: could not set content"));

        return;

    }

    QDomElement root = document.documentElement();

    if (root.tagName() != TAG_ROOT) {

        CX_DEBUG(("Settings mapping XML: root name wrong %s", root.tagName().toAscii().constData()));

        return;

    }

    QDomElement e = findChildElement(root, TAG_SETTINGS);

    if (e.isNull()) {

        CX_DEBUG(("Settings mapping XML: could not find settings tag"));

        return;

    }

    parseSettings(e);

    // We've done parsing. No need to do it again.

    mParsed = true;

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Parses the settings in XML and creates settings requested using the DOM element

*/

void CxuiSettingXmlReader::parseSettings(const QDomElement& element) {

    CX_DEBUG_ENTER_FUNCTION();

    if (element.isNull()) {

        //!@todo throw exception

        return;

    }

    QString tagName;

    QDomElement e;

    // Go through list of items

    for(QDomNode n = element.firstChild(); !n.isNull(); n = n.nextSibling()) {

        e = n.toElement();

        tagName = e.tagName();

        if (tagName == TAG_SETTING_LIST) {

            // <setting_list id="WHITE_BALANCE" heading="qtn_setting_title_wb">

            RadioButtonListParams *p(parseSettingList(e));

            if (p) {

                mListParams.insert(p->mSettingId,p);

            }

        } else if(tagName == TAG_SETTING_SLIDER) {

            // <setting_slider id="EXPOSURE_COMPENSATION" heading="qtn_setting_title_ev">

            SliderParams *p(parseSettingSlider(e));

            if (p) {

                mSliderParams.insert(p->mSettingId,p);

            }

        }

    }

    CX_DEBUG_EXIT_FUNCTION();

}

/*!

* Creates the settings list based on the DomElement

returns radiobutton list data

*/

CxUiSettings::RadioButtonListParams *CxuiSettingXmlReader::parseSettingList(const QDomElement& element)

{

    CX_DEBUG_ENTER_FUNCTION();

    // Read the heading and id.

    if (element.isNull()) {

        return NULL;

    }

    RadioButtonListParams *p = new RadioButtonListParams();

    CX_DEBUG(("Parsing radio button list for setting id [%s]", element.attribute(ATTRIBUTE_ID).toAscii().constData()));

    // XML something like this

    // <setting_list id="WHITE_BALANCE" heading="qtn_setting_title_wb">

    p->mHeading = hbTrId(element.attribute(ATTRIBUTE_HEADING).toAscii().constData());

    p->mSettingId = element.attribute(ATTRIBUTE_ID);

    p->mHeadingIcon = element.attribute(ATTRIBUTE_HEADING_ICON);

    // Set the list box attributes

    // Example: preview="1"

    p->mPreview = element.attribute(ATTRIBUTE_PREVIEW).toInt() == 1;

    // Example: type="SingleLineListBox"

    if (element.attribute(ATTRIBUTE_LISTBOXTYPE) == SINGLE_LINE_LISTBOX) {

        p->mListboxType = CxuiSettingRadioButtonList::SingleLine;

    } else if(element.attribute(ATTRIBUTE_LISTBOXTYPE) == TWO_LINE_LISTBOX) {

        p->mListboxType = CxuiSettingRadioButtonList::TwoLine;

    }

    QDomElement e;

    p->mSettingPairList.clear();

    // Go through list of items

    // XML something like this

    // <item value="0" string="qtn_whitebalance_auto" />

    for (QDomNode n = element.firstChild(); !n.isNull(); n = n.nextSibling()) {

        e = n.toElement();

        // get the string text id from the xml

        QString string = e.attribute(ATTRIBUTE_LOCALIZATION_ID);

        // get the equivalent engine value from xml

        QVariant value = e.attribute(ATTRIBUTE_VALUE);

        CX_DEBUG(("tag name <%s>", e.tagName().toAscii().constData()));

        if (e.tagName() == TAG_ITEM) {

            // get the localizable string from the hbtrid

            string = hbTrId(string.toAscii().constData());

        } else if (e.tagName() == TAG_ITEM_VARIANT) {

            QString lnValue = e.attribute(ATTRIBUTE_LOCALIZATION_ID_LN_VALUE);

            // format the setting string

            string = hbTrId(string.toAscii().constData(), lnValue.toInt());

        }

        CX_DEBUG(("attribute [%s] value[%s]", ATTRIBUTE_LOCALIZATION_ID, string.toAscii().constData()));

        if (!string.isNull()) {

            CxUiSettings::SettingItem setting;

            setting.mItem = string;

            setting.mValue = value;

            setting.mIcon = e.attribute(ATTRIBUTE_ICON);

            p->mSettingPairList.append(setting);

        }

    }

    CX_DEBUG_EXIT_FUNCTION();

    return p;

}

/*!

* Creates the slider settings based on the DomElement

@param element specifies the dom element

returns slider parameters

*/

CxUiSettings::SliderParams *CxuiSettingXmlReader::parseSettingSlider(const QDomElement& element)

{

    CX_DEBUG_ENTER_FUNCTION();

    // Read the heading and id.

    if (element.isNull()) {

        return NULL;

    }

    SliderParams *p = new SliderParams();

    CX_DEBUG(("Parsing slider for setting id [%s]", element.attribute(ATTRIBUTE_ID).toAscii().constData()));

    // XML something like this

    // <setting_list id="WHITE_BALANCE" heading="qtn_setting_title_wb">

    p->mHeading = hbTrId(element.attribute(ATTRIBUTE_HEADING).toAscii().constData());

    p->mSettingId = element.attribute(ATTRIBUTE_ID);

    p->mHeadingIcon = element.attribute(ATTRIBUTE_HEADING_ICON);

    QDomNode n = element.firstChild();

    QDomElement e = n.toElement();

    p->mSettingStrings.clear();

    CX_DEBUG(("tag name <%s>", e.tagName().toAscii().constData()));

    if (e.tagName() == TAG_SETUP) {

        // get the min text id from the xml

        QString minString = e.attribute(ATTRIBUTE_SLIDER_MIN);

        // get the max text id from the xml

        QString maxString = e.attribute(ATTRIBUTE_SLIDER_MAX);

        // get the step text id from the xml

        QVariant stepString = e.attribute(ATTRIBUTE_SLIDER_STEP);

        p->mStep = stepString.toReal();

        // get the ln value from xml to generate strings for slider

        QString lnValue = e.attribute(ATTRIBUTE_LOCALIZATION_ID_LN_VALUE);

        // Don't create labels for slider if no strings are defined in settinsg xml

        if (!minString.isEmpty() && !maxString.isEmpty()) {

            qreal step = p->mStep;

            qreal value = lnValue.toDouble();

            // generating all negative valued strings for slider setting

            while (value > 0) {

                // format the setting string

                QString str =  hbTrId(minString.toAscii().constData()).arg(value,0,'f',1);

                p->mSettingStrings.append(str);

                value = value - step;

            }

            // generating all non-negative valued strings for slider setting

            step = p->mStep;

            value = 0;

            while(value <= lnValue.toInt()) {

                // format the setting string

                QString str = hbTrId(maxString.toAscii().constData()).arg(value,0,'f',1);

                p->mSettingStrings.append(str);

                value = value + step;

            }

        }

        int min = -lnValue.toInt();

        int max = lnValue.toInt();

        p->mRange = qMakePair(min, max);

    }

    CX_DEBUG_EXIT_FUNCTION();

    return p;

}

/*!

* CxuiSettingXmlReader::findChildElement

*/

QDomElement CxuiSettingXmlReader::findChildElement(const QDomNode& parent, const QString& name) {

    CX_DEBUG(("findChildElement name[%s]", name.toAscii().constData()));

    for (QDomNode n = parent.firstChild(); !n.isNull(); n = n.nextSibling()) {

        QDomElement e = n.toElement();

        if (e.tagName() == name) {

            return e;

        }

    }

    return QDomElement();

}