/*
 *   Copyright 2007 Aaron Seigo <aseigo@kde.org>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2, or
 *   (at your option) any later version.
 *
 *   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 General Public License for more details
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "kconfigloader.h"
#include "kconfigloader_p.h"
#include "kconfigloaderhandler_p.h"

#include <QColor>
#include <QFont>
#include <QHash>
#include <QXmlContentHandler>
#include <QXmlInputSource>
#include <QXmlSimpleReader>
#include <QUrl>

#include <QDebug>

void ConfigLoaderPrivate::parse(KConfigLoader *loader, QIODevice *xml)
{
    clearData();
    loader->clearItems();

    if (xml) {
        QXmlInputSource source(xml);
        QXmlSimpleReader reader;
        ConfigLoaderHandler handler(loader, this);
        reader.setContentHandler(&handler);
        reader.parse(&source, false);
    }
}

ConfigLoaderHandler::ConfigLoaderHandler(KConfigLoader *config, ConfigLoaderPrivate *d)
    : QXmlDefaultHandler(),
      m_config(config),
      d(d)
{
    resetState();
}

bool ConfigLoaderHandler::startElement(const QString &namespaceURI, const QString &localName,
                                       const QString &qName, const QXmlAttributes &attrs)
{
    Q_UNUSED(namespaceURI)
    Q_UNUSED(qName)

//     qDebug() << "ConfigLoaderHandler::startElement(" << localName << qName;
    int numAttrs = attrs.count();
    QString tag = localName.toLower();
    if (tag == QStringLiteral("group")) {
        QString group;
        for (int i = 0; i < numAttrs; ++i) {
            QString name = attrs.localName(i).toLower();
            if (name == QStringLiteral("name")) {
                //qDebug() << "set group to" << attrs.value(i);
                group = attrs.value(i);
            }
        }
        if (group.isEmpty()) {
            group = d->baseGroup;
        } else {
            d->groups.append(group);
            if (!d->baseGroup.isEmpty()) {
                group = d->baseGroup + QLatin1Char('\x1d') + group;
            }
        }

        if (m_config) {
            m_config->setCurrentGroup(group);
        }
    } else if (tag == QStringLiteral("entry")) {
        for (int i = 0; i < numAttrs; ++i) {
            QString name = attrs.localName(i).toLower();
            if (name == QStringLiteral("name")) {
                m_name = attrs.value(i).trimmed();
            } else if (name == QStringLiteral("type")) {
                m_type = attrs.value(i).toLower();
            } else if (name == QStringLiteral("key")) {
                m_key = attrs.value(i).trimmed();
            }
        }
    } else if (tag == QStringLiteral("choice")) {
        m_choice.name.clear();
        m_choice.label.clear();
        m_choice.whatsThis.clear();
        for (int i = 0; i < numAttrs; ++i) {
            QString name = attrs.localName(i).toLower();
            if (name == QStringLiteral("name")) {
                m_choice.name = attrs.value(i);
            }
        }
        m_inChoice = true;
    }

    return true;
}

bool ConfigLoaderHandler::characters(const QString &ch)
{
    m_cdata.append(ch);
    return true;
}

QString ConfigLoaderHandler::name() const
{
    return m_name;
}

void ConfigLoaderHandler::setName(const QString &name)
{
    m_name = name;
}

QString ConfigLoaderHandler::key() const
{
    return m_key;
}

void ConfigLoaderHandler::setKey(const QString &key)
{
    m_key = key;
}

QString ConfigLoaderHandler::type() const
{
    return m_type;
}

QString ConfigLoaderHandler::defaultValue() const
{
    return m_default;
}

bool ConfigLoaderHandler::endElement(const QString &namespaceURI,
                                     const QString &localName, const QString &qName)
{
    Q_UNUSED(namespaceURI)
    Q_UNUSED(qName)

//     qDebug() << "ConfigLoaderHandler::endElement(" << localName << qName;
    const QString tag = localName.toLower();
    if (tag == QStringLiteral("entry")) {
        addItem();
        resetState();
    } else if (tag == QStringLiteral("label")) {
        if (m_inChoice) {
            m_choice.label = m_cdata.trimmed();
        } else {
            m_label = m_cdata.trimmed();
        }
    } else if (tag == QStringLiteral("whatsthis")) {
        if (m_inChoice) {
            m_choice.whatsThis = m_cdata.trimmed();
        } else {
            m_whatsThis = m_cdata.trimmed();
        }
    } else if (tag == QStringLiteral("default")) {
        m_default = m_cdata.trimmed();
    } else if (tag == QStringLiteral("min")) {
        m_min = m_cdata.toInt(&m_haveMin);
    } else if (tag == QStringLiteral("max")) {
        m_max = m_cdata.toInt(&m_haveMax);
    } else if (tag == QStringLiteral("choice")) {
        m_enumChoices.append(m_choice);
        m_inChoice = false;
    }

    m_cdata.clear();
    return true;
}

void ConfigLoaderHandler::addItem()
{
    if (m_name.isEmpty()) {
        if (m_key.isEmpty()) {
            return;
        }

        m_name = m_key;
    }

    m_name.remove(QLatin1Char(' '));

    KConfigSkeletonItem *item = nullptr;

    if (m_type == QStringLiteral("bool")) {
        bool defaultValue = m_default.toLower() == QStringLiteral("true");
        item = m_config->addItemBool(m_name, *d->newBool(), defaultValue, m_key);
    } else if (m_type == QStringLiteral("color")) {
        item = m_config->addItemColor(m_name, *d->newColor(), QColor(m_default), m_key);
    } else if (m_type == QStringLiteral("datetime")) {
        item = m_config->addItemDateTime(m_name, *d->newDateTime(),
                                         QDateTime::fromString(m_default), m_key);
    } else if (m_type == QStringLiteral("enum")) {
        m_key = (m_key.isEmpty()) ? m_name : m_key;
        KConfigSkeleton::ItemEnum *enumItem =
            new KConfigSkeleton::ItemEnum(m_config->currentGroup(),
                                          m_key, *d->newInt(),
                                          m_enumChoices,
                                          m_default.toUInt());
        m_config->addItem(enumItem, m_name);
        item = enumItem;
    } else if (m_type == QStringLiteral("font")) {
        item = m_config->addItemFont(m_name, *d->newFont(), QFont(m_default), m_key);
    } else if (m_type == QStringLiteral("int")) {
        KConfigSkeleton::ItemInt *intItem = m_config->addItemInt(m_name, *d->newInt(),
                                            m_default.toInt(), m_key);

        if (m_haveMin) {
            intItem->setMinValue(m_min);
        }

        if (m_haveMax) {
            intItem->setMaxValue(m_max);
        }

        item = intItem;
    } else if (m_type == QStringLiteral("password")) {
        item = m_config->addItemPassword(m_name, *d->newString(), m_default, m_key);
    } else if (m_type == QStringLiteral("path")) {
        item = m_config->addItemPath(m_name, *d->newString(), m_default, m_key);
    } else if (m_type == QStringLiteral("string")) {
        item = m_config->addItemString(m_name, *d->newString(), m_default, m_key);
    } else if (m_type == QStringLiteral("stringlist")) {
        //FIXME: the split() is naive and will break on lists with ,'s in them
        //empty parts are not wanted in this case
        item = m_config->addItemStringList(m_name, *d->newStringList(),
                                           m_default.split(QLatin1Char(','), QString::SkipEmptyParts), m_key);
    } else if (m_type == QStringLiteral("uint")) {
        KConfigSkeleton::ItemUInt *uintItem =
            m_config->addItemUInt(m_name, *d->newUint(), m_default.toUInt(), m_key);
        if (m_haveMin) {
            uintItem->setMinValue(m_min);
        }
        if (m_haveMax) {
            uintItem->setMaxValue(m_max);
        }
        item = uintItem;
    } else if (m_type == QStringLiteral("url")) {
        m_key = (m_key.isEmpty()) ? m_name : m_key;
        KConfigSkeleton::ItemUrl *urlItem =
            new KConfigSkeleton::ItemUrl(m_config->currentGroup(),
                                         m_key, *d->newUrl(),
                                         QUrl::fromUserInput(m_default));
        m_config->addItem(urlItem, m_name);
        item = urlItem;
    } else if (m_type == QStringLiteral("double")) {
        KConfigSkeleton::ItemDouble *doubleItem = m_config->addItemDouble(m_name,
                *d->newDouble(), m_default.toDouble(), m_key);
        if (m_haveMin) {
            doubleItem->setMinValue(m_min);
        }
        if (m_haveMax) {
            doubleItem->setMaxValue(m_max);
        }
        item = doubleItem;
    } else if (m_type == QStringLiteral("intlist")) {
        QStringList tmpList = m_default.split(QLatin1Char(','));
        QList<int> defaultList;
        foreach (const QString &tmp, tmpList) {
            defaultList.append(tmp.toInt());
        }
        item = m_config->addItemIntList(m_name, *d->newIntList(), defaultList, m_key);
    } else if (m_type == QStringLiteral("longlong")) {
        KConfigSkeleton::ItemLongLong *longlongItem = m_config->addItemLongLong(m_name,
                *d->newLongLong(), m_default.toLongLong(), m_key);
        if (m_haveMin) {
            longlongItem->setMinValue(m_min);
        }
        if (m_haveMax) {
            longlongItem->setMaxValue(m_max);
        }
        item = longlongItem;
        /* No addItemPathList in KConfigSkeleton ?
        } else if (m_type == "PathList") {
            //FIXME: the split() is naive and will break on lists with ,'s in them
            item = m_config->addItemPathList(m_name, *d->newStringList(), m_default.split(","), m_key);
        */
    } else if (m_type == QStringLiteral("point")) {
        QPoint defaultPoint;
        QStringList tmpList = m_default.split(QLatin1Char(','));
        if (tmpList.size() >= 2) {
            defaultPoint.setX(tmpList[0].toInt());
            defaultPoint.setY(tmpList[1].toInt());
        }
        item = m_config->addItemPoint(m_name, *d->newPoint(), defaultPoint, m_key);
    } else if (m_type == QStringLiteral("rect")) {
        QRect defaultRect;
        QStringList tmpList = m_default.split(QLatin1Char(','));
        if (tmpList.size() >= 4) {
            defaultRect.setCoords(tmpList[0].toInt(), tmpList[1].toInt(),
                                  tmpList[2].toInt(), tmpList[3].toInt());
        }
        item = m_config->addItemRect(m_name, *d->newRect(), defaultRect, m_key);
    } else if (m_type == QStringLiteral("size")) {
        QSize defaultSize;
        QStringList tmpList = m_default.split(QLatin1Char(','));
        if (tmpList.size() >= 2) {
            defaultSize.setWidth(tmpList[0].toInt());
            defaultSize.setHeight(tmpList[1].toInt());
        }
        item = m_config->addItemSize(m_name, *d->newSize(), defaultSize, m_key);
    } else if (m_type == QStringLiteral("ulonglong")) {
        KConfigSkeleton::ItemULongLong *ulonglongItem =
            m_config->addItemULongLong(m_name, *d->newULongLong(), m_default.toULongLong(), m_key);
        if (m_haveMin) {
            ulonglongItem->setMinValue(m_min);
        }
        if (m_haveMax) {
            ulonglongItem->setMaxValue(m_max);
        }
        item = ulonglongItem;
        /* No addItemUrlList in KConfigSkeleton ?
        } else if (m_type == "urllist") {
            //FIXME: the split() is naive and will break on lists with ,'s in them
            QStringList tmpList = m_default.split(",");
            QList<QUrl> defaultList;
            foreach (const QString& tmp, tmpList) {
                defaultList.append(QUrl(tmp));
            }
            item = m_config->addItemUrlList(m_name, *d->newUrlList(), defaultList, m_key);*/
    }

    if (item) {
        item->setLabel(m_label);
        item->setWhatsThis(m_whatsThis);
        d->keysToNames.insert(item->group() + item->key(), item->name());
    }
}

void ConfigLoaderHandler::resetState()
{
    m_haveMin = false;
    m_min = 0;
    m_haveMax = false;
    m_max = 0;
    m_name.clear();
    m_type.clear();
    m_label.clear();
    m_default.clear();
    m_key.clear();
    m_whatsThis.clear();
    m_enumChoices.clear();
    m_inChoice = false;
}

KConfigLoader::KConfigLoader(const QString &configFile, QIODevice *xml, QObject *parent)
    : KConfigSkeleton(configFile, parent),
      d(new ConfigLoaderPrivate)
{
    d->parse(this, xml);
}

KConfigLoader::KConfigLoader(KSharedConfigPtr config, QIODevice *xml, QObject *parent)
    : KConfigSkeleton(config, parent),
      d(new ConfigLoaderPrivate)
{
    d->parse(this, xml);
}

//FIXME: obviously this is broken and should be using the group as the root,
//       but KConfigSkeleton does not currently support this. it will eventually though,
//       at which point this can be addressed properly
KConfigLoader::KConfigLoader(const KConfigGroup &config, QIODevice *xml, QObject *parent)
    : KConfigSkeleton(KSharedConfig::openConfig(config.config()->name(), config.config()->openFlags()), parent),
      d(new ConfigLoaderPrivate)
{
    KConfigGroup group = config.parent();
    d->baseGroup = config.name();
    while (group.isValid() && group.name() != QStringLiteral("<default>")) {
        d->baseGroup = group.name() + QLatin1Char('\x1d') + d->baseGroup;
        group = group.parent();
    }
    d->parse(this, xml);
}

KConfigLoader::~KConfigLoader()
{
    delete d;
}

KConfigSkeletonItem *KConfigLoader::findItem(const QString &group, const QString &key) const
{
    return KConfigSkeleton::findItem(d->keysToNames[group + key]);
}

KConfigSkeletonItem *KConfigLoader::findItemByName(const QString &name) const
{
    return KConfigSkeleton::findItem(name);
}

QVariant KConfigLoader::property(const QString &name) const
{
    KConfigSkeletonItem *item = KConfigSkeleton::findItem(name);

    if (item) {
        return item->property();
    }

    return QVariant();
}

bool KConfigLoader::hasGroup(const QString &group) const
{
    return d->groups.contains(group);
}

QStringList KConfigLoader::groupList() const
{
    return d->groups;
}

bool KConfigLoader::usrWriteConfig()
{
    if (d->saveDefaults) {
        foreach (const auto& item, items()) {
            config()->group(item->group()).writeEntry(item->key(), "");
        }
    }
    return true;
}
