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#include "fontpropertymanager.h"

#include "qtpropertymanager.h"

#include "qtvariantproperty.h"

#include "qtpropertybrowserutils_p.h"

#include <qdesigner_utils_p.h>

#include <QtCore/QCoreApplication>

#include <QtCore/QVariant>

#include <QtCore/QString>

#include <QtCore/QDebug>

#include <QtCore/QFile>

#include <QtCore/QTextStream>

#include <QtXml/QXmlStreamReader>

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

    static const char *aliasingC[] = {

        QT_TRANSLATE_NOOP("FontPropertyManager", "PreferDefault"),

        QT_TRANSLATE_NOOP("FontPropertyManager", "NoAntialias"),

        QT_TRANSLATE_NOOP("FontPropertyManager", "PreferAntialias")

    };

    FontPropertyManager::FontPropertyManager() :

        m_createdFontProperty(0)

    {

        const int nameCount = sizeof(aliasingC)/sizeof(const char *);

        for (int  i = 0; i < nameCount; i++)

            m_aliasingEnumNames.push_back(QCoreApplication::translate("FontPropertyManager", aliasingC[i]));

        QString errorMessage;

        if (!readFamilyMapping(&m_familyMappings, &errorMessage)) {

            designerWarning(errorMessage);

        }

    }

    void FontPropertyManager::preInitializeProperty(QtProperty *property,

                                                    int type,

                                                    ResetMap &resetMap)

    {

        if (m_createdFontProperty) {

            PropertyToSubPropertiesMap::iterator it = m_propertyToFontSubProperties.find(m_createdFontProperty);

            if (it == m_propertyToFontSubProperties.end())

                it = m_propertyToFontSubProperties.insert(m_createdFontProperty, PropertyList());

            const int index = it.value().size();

            m_fontSubPropertyToFlag.insert(property, index);

            it.value().push_back(property);

            m_fontSubPropertyToProperty[property] = m_createdFontProperty;

            resetMap[property] = true;

        }

        if (type == QVariant::Font)

            m_createdFontProperty = property;

    }

    // Map the font family names to display names retrieved from the XML configuration

    static QStringList designerFamilyNames(QStringList families, const FontPropertyManager::NameMap &nm)

    {

        if (nm.empty())

            return families;

        const FontPropertyManager::NameMap::const_iterator ncend = nm.constEnd();

        const QStringList::iterator end = families.end();

        for (QStringList::iterator it = families.begin(); it != end; ++it) {

            const FontPropertyManager::NameMap::const_iterator nit = nm.constFind(*it);

            if (nit != ncend)

                *it = nit.value();

        }

        return families;

    }

    void FontPropertyManager::postInitializeProperty(QtVariantPropertyManager *vm,

                                                     QtProperty *property,

                                                     int type,

                                                     int enumTypeId)

    {

        if (type != QVariant::Font)

            return;

        // This will cause a recursion

        QtVariantProperty *antialiasing = vm->addProperty(enumTypeId, QCoreApplication::translate("FontPropertyManager", "Antialiasing"));

        const QFont font = qVariantValue<QFont>(vm->variantProperty(property)->value());

        antialiasing->setAttribute(QLatin1String("enumNames"), m_aliasingEnumNames);

        antialiasing->setValue(antialiasingToIndex(font.styleStrategy()));

        property->addSubProperty(antialiasing);

        m_propertyToAntialiasing[property] = antialiasing;

        m_antialiasingToProperty[antialiasing] = property;

        // Fiddle family names

        if (!m_familyMappings.empty()) {

            const PropertyToSubPropertiesMap::iterator it = m_propertyToFontSubProperties.find(m_createdFontProperty);

            QtVariantProperty *familyProperty = vm->variantProperty(it.value().front());

            const QString enumNamesAttribute = QLatin1String("enumNames");

            QStringList plainFamilyNames = familyProperty->attributeValue(enumNamesAttribute).toStringList();

            // Did someone load fonts or something?

            if (m_designerFamilyNames.size() != plainFamilyNames.size())

                m_designerFamilyNames = designerFamilyNames(plainFamilyNames, m_familyMappings);

            familyProperty->setAttribute(enumNamesAttribute, m_designerFamilyNames);

        }

        // Next

        m_createdFontProperty = 0;

    }

    bool FontPropertyManager::uninitializeProperty(QtProperty *property)

    {

        const PropertyToPropertyMap::iterator ait =  m_propertyToAntialiasing.find(property);

        if (ait != m_propertyToAntialiasing.end()) {

            QtProperty *antialiasing = ait.value();

            m_antialiasingToProperty.remove(antialiasing);

            m_propertyToAntialiasing.erase(ait);

            delete antialiasing;

        }

        PropertyToSubPropertiesMap::iterator sit = m_propertyToFontSubProperties.find(property);

        if (sit == m_propertyToFontSubProperties.end())

            return false;

        m_propertyToFontSubProperties.erase(sit);

        m_fontSubPropertyToFlag.remove(property);

        m_fontSubPropertyToProperty.remove(property);

        return true;

    }

    void FontPropertyManager::slotPropertyDestroyed(QtProperty *property)

    {

        removeAntialiasingProperty(property);

    }

    void FontPropertyManager::removeAntialiasingProperty(QtProperty *property)

    {

        const PropertyToPropertyMap::iterator ait =  m_antialiasingToProperty.find(property);

        if (ait == m_antialiasingToProperty.end())

            return;

        m_propertyToAntialiasing[ait.value()] = 0;

        m_antialiasingToProperty.erase(ait);

    }

    bool FontPropertyManager::resetFontSubProperty(QtVariantPropertyManager *vm, QtProperty *property)

    {

        const PropertyToPropertyMap::iterator it = m_fontSubPropertyToProperty.find(property);

        if (it == m_fontSubPropertyToProperty.end())

            return false;

        QtVariantProperty *fontProperty = vm->variantProperty(it.value());

        QVariant v = fontProperty->value();

        QFont font = qvariant_cast<QFont>(v);

        unsigned mask = font.resolve();

        const unsigned flag = fontFlag(m_fontSubPropertyToFlag.value(property));

        mask &= ~flag;

        font.resolve(mask);

        qVariantSetValue(v, font);

        fontProperty->setValue(v);

        return true;

    }

    int FontPropertyManager::antialiasingToIndex(QFont::StyleStrategy antialias)

    {

        switch (antialias) {

        case QFont::PreferDefault:   return 0;

        case QFont::NoAntialias:     return 1;

        case QFont::PreferAntialias: return 2;

        default: break;

        }

        return 0;

    }

    QFont::StyleStrategy FontPropertyManager::indexToAntialiasing(int idx)

    {

        switch (idx) {

        case 0: return QFont::PreferDefault;

        case 1: return QFont::NoAntialias;

        case 2: return QFont::PreferAntialias;

        }

        return QFont::PreferDefault;

    }

    unsigned FontPropertyManager::fontFlag(int idx)

    {

        switch (idx) {

        case 0: return QFont::FamilyResolved;

        case 1: return QFont::SizeResolved;

        case 2: return QFont::WeightResolved;

        case 3: return QFont::StyleResolved;

        case 4: return QFont::UnderlineResolved;

        case 5: return QFont::StrikeOutResolved;

        case 6: return QFont::KerningResolved;

        case 7: return QFont::StyleStrategyResolved;

        }

        return 0;

    }

    FontPropertyManager::ValueChangedResult FontPropertyManager::valueChanged(QtVariantPropertyManager *vm, QtProperty *property, const QVariant &value)

    {

        QtProperty *antialiasingProperty = m_antialiasingToProperty.value(property, 0);

        if (!antialiasingProperty) {

            if (m_propertyToFontSubProperties.contains(property)) {

                updateModifiedState(property, value);

            }

            return NoMatch;

        }

        QtVariantProperty *fontProperty = vm->variantProperty(antialiasingProperty);

        const QFont::StyleStrategy newValue = indexToAntialiasing(value.toInt());

        QFont font = qVariantValue<QFont>(fontProperty->value());

        const QFont::StyleStrategy oldValue = font.styleStrategy();

        if (newValue == oldValue)

            return Unchanged;

        font.setStyleStrategy(newValue);

        fontProperty->setValue(qVariantFromValue(font));

        return Changed;

    }

    void FontPropertyManager::updateModifiedState(QtProperty *property, const QVariant &value)

    {

        const PropertyToSubPropertiesMap::iterator it = m_propertyToFontSubProperties.find(property);

        if (it == m_propertyToFontSubProperties.end())

            return;

        const PropertyList &subProperties = it.value();

        QFont font = qVariantValue<QFont>(value);

        const unsigned mask = font.resolve();

        const int count = subProperties.size();

        for (int index = 0; index < count; index++) {

             const unsigned flag = fontFlag(index);

             subProperties.at(index)->setModified(mask & flag);

        }

    }

    void FontPropertyManager::setValue(QtVariantPropertyManager *vm, QtProperty *property, const QVariant &value)

    {

        updateModifiedState(property, value);

        if (QtProperty *antialiasingProperty = m_propertyToAntialiasing.value(property, 0)) {

            QtVariantProperty *antialiasing = vm->variantProperty(antialiasingProperty);

            if (antialiasing) {

                QFont font = qVariantValue<QFont>(value);

                antialiasing->setValue(antialiasingToIndex(font.styleStrategy()));

            }

        }

    }

    /* Parse a mappings file of the form:

     * <fontmappings>

     * <mapping><family>DejaVu Sans</family><display>DejaVu Sans [CE]</display></mapping>

     * ... which is used to display on which platforms fonts are available.*/

    static const char *rootTagC = "fontmappings";

    static const char *mappingTagC = "mapping";

    static const char *familyTagC = "family";

    static const char *displayTagC = "display";

    static QString msgXmlError(const QXmlStreamReader &r, const QString& fileName)

    {

        return QString::fromUtf8("An error has been encountered at line %1 of %2: %3:").arg(r.lineNumber()).arg(fileName, r.errorString());

    }

    /* Switch stages when encountering a start element (state table) */

    enum ParseStage { ParseBeginning, ParseWithinRoot, ParseWithinMapping, ParseWithinFamily,

                      ParseWithinDisplay, ParseError };

    static ParseStage nextStage(ParseStage currentStage, const QStringRef &startElement)

    {

        switch (currentStage) {

        case ParseBeginning:

            return startElement == QLatin1String(rootTagC) ? ParseWithinRoot : ParseError;

        case ParseWithinRoot:

        case ParseWithinDisplay: // Next mapping, was in <display>

            return startElement == QLatin1String(mappingTagC) ? ParseWithinMapping : ParseError;

        case ParseWithinMapping:

            return startElement == QLatin1String(familyTagC) ? ParseWithinFamily : ParseError;

        case ParseWithinFamily:

            return startElement == QLatin1String(displayTagC) ? ParseWithinDisplay : ParseError;

        case ParseError:

            break;

        }

        return  ParseError;

    }

    bool FontPropertyManager::readFamilyMapping(NameMap *rc, QString *errorMessage)

    {

        rc->clear();

        const QString fileName = QLatin1String(":/trolltech/propertyeditor/fontmapping.xml");

        QFile file(fileName);

        if (!file.open(QIODevice::ReadOnly)) {

            *errorMessage = QString::fromUtf8("Unable to open %1: %2").arg(fileName, file.errorString());

            return false;

        }

        QXmlStreamReader reader(&file);

        QXmlStreamReader::TokenType token;

        QString family;

        ParseStage stage = ParseBeginning;

        do {

            token = reader.readNext();

            switch (token) {

            case QXmlStreamReader::Invalid:

                *errorMessage = msgXmlError(reader, fileName);

                 return false;

            case QXmlStreamReader::StartElement:

                stage = nextStage(stage, reader.name());

                switch (stage) {

                case ParseError:

                    reader.raiseError(QString::fromUtf8("Unexpected element <%1>.").arg(reader.name().toString()));

                    *errorMessage = msgXmlError(reader, fileName);

                    return false;

                case ParseWithinFamily:

                    family = reader.readElementText();

                    break;

                case ParseWithinDisplay:

                    rc->insert(family, reader.readElementText());

                    break;

                default:

                    break;

                }

            default:

                break;

            }

        } while (token != QXmlStreamReader::EndDocument);

        return true;

    }

}

QT_END_NAMESPACE