/*
 * Copyright 2008-2009 Ben Boeckel <MathStuf@gmail.com>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, 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 General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

// Header include
#include "Config.h"

// Qt includes
#include <QtCore/QSet>

using namespace Sigscript;

Config::Config(Config* parent) :
        QObject(parent),
        m_lock(QReadWriteLock::Recursive),
        m_parent(parent)
{
}

bool Config::addValue(const QString& name, const QVariant& value)
{
    if (!m_values.contains(name) || (m_values[name].second & Deleted))
        return setValue(name, value);
    return false;
}

bool Config::setValue(const QString& name, const QVariant& value)
{
    QWriteLocker locker(&m_lock);
    if (m_values.contains(name) && (m_values[name].second & ReadOnly))
        return false;
    if (!m_values.contains(name) || (m_values[name].second & Deleted))
    {
        m_values[name].second &= ~Deleted;
        emit(valueAdded(name, value));
    }
    m_values[name] = Value(value, 0);
    emit(valueChanged(name, value));
    return true;
}

bool Config::removeValue(const QString& name, const bool shadow)
{
    QWriteLocker locker(&m_lock);
    if (shadow)
        setOptions(name, Deleted);
    else if (m_values.contains(name))
        m_values.remove(name);
    else
        return false;
    emit(valueRemoved(name));
    return true;
}

QVariant Config::value(const QString& name, const bool recursive) const
{
    QReadLocker locker(&m_lock);
    if (m_values.contains(name))
    {
        if (m_values[name].second & (Deleted | Hidden))
            return QVariant();
        return m_values[name].first;
    }
    if (recursive && m_parent)
        return m_parent->value(name, true);
    return QVariant();
}

bool Config::hasValue(const QString& name, const bool recursive) const
{
    QReadLocker locker(&m_lock);
    if (m_values.contains(name))
        return !(m_values[name].second & (Deleted | Hidden));
    if (recursive && m_parent)
        return m_parent->hasValue(name, true);
    return false;
}

QStringList Config::values(const bool recursive) const
{
    QReadLocker locker(&m_lock);
    QStringList values = m_values.keys();
    if (recursive && m_parent)
        values += m_parent->values(true);
    for (QMutableStringListIterator i(values); i.hasNext(); i.next())
    {
        if (m_values.contains(i.value()) && (m_values[i.value()].second & (Deleted | Hidden)))
            i.remove();
    }
    return values.toSet().toList();
}

bool Config::setOptions(const QString& name, const Options options)
{
    QWriteLocker locker(&m_lock);
    if (m_values.contains(name) && ((~m_values[name].second) & options))
    {
        m_values[name].second |= options;
        emit(optionsChanged(name, options));
        return true;
    }
    return false;
}

bool Config::unsetOptions(const QString& name, const Options options)
{
    QWriteLocker locker(&m_lock);
    if (m_values.contains(name) && (m_values[name].second & options))
    {
        m_values[name].second &= ~options;
        emit(optionsChanged(name, options));
        return true;
    }
    return false;
}

Config::Options Config::options(const QString& name, const bool recursive) const
{
    QReadLocker locker(&m_lock);
    if (m_values.contains(name))
        return m_values[name].second;
    if (recursive && m_parent)
        return m_parent->options(name, recursive);
    return 0;
}

void Config::clean()
{
//     QWriteLocker locker(&m_lock);
    for (QMutableMapIterator<QString, Value> i(m_values); i.hasNext(); i.next())
    {
        unsetOptions(i.key(), Hidden);
        if (i.value().second & Temporary)
            removeValue(i.key(), false);
    }
}

void Config::writeBack()
{
    QWriteLocker locker(&m_lock);
}