/******************************************************************************
 *
 *  Copyright 2008 Szymon Tomasz Stefanek <pragma@kvirc.net>
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *******************************************************************************/

#ifndef __MESSAGELIST_CORE_OPTIONSET_H__
#define __MESSAGELIST_CORE_OPTIONSET_H__

#include <QString>

class QDataStream;

namespace MessageList
{

namespace Core
{

/**
 * A set of options that can be applied to the MessageList in one shot.
 * In the sources and in the user interface you can find this set of options
 * referred also as "View Mode" or "Preset".
 *
 * The option set has a name and an unique id that identifies it. The name
 * is shown to the user in the combo box above the message list view.
 * The set has also a description that is shown as tooltip and should explain
 * the purpose, the best usage cases, eventually the advantages and disadvantages.
 *
 * The option set can be "packed" to a string and "unpacked" from a string. This
 * is basically for storing it in a configuration file.
 */
class OptionSet
{
public:
    explicit OptionSet();
    explicit OptionSet(const OptionSet &src);
    explicit OptionSet(const QString &name, const QString &description, bool readOnly = false);
    virtual ~OptionSet();

protected:
    QString mId;
    QString mName;
    QString mDescription;
    bool mReadOnly;

public:
    /**
    * Returns the unique id of this OptionSet.
    * The id can't be set. It's either automatically generated or loaded from configuration.
    */
    const QString &id() const
    {
        return mId;
    }

    /**
    * Returns the name of this OptionSet
    */
    const QString &name() const
    {
        return mName;
    }

    /**
    * Sets the name of this OptionSet. You must take care
    * of specifying an _unique_ name in order for the Manager to
    * store the sets properly.
    */
    void setName(const QString &name)
    {
        mName = name;
    }

    /**
    * Returns a description of this option set. Ideally it should contain
    * its purpose and what to expect from it. But in the end we'll show
    * whatever the user will put in here.
    */
    const QString &description() const
    {
        return mDescription;
    }

    /**
    * Sets the description for this option set.
    */
    void setDescription(const QString &description)
    {
        mDescription = description;
    }

    /**
    * Packs this configuration object into a string suitable for storing
    * in a config file.
    */
    QString saveToString() const;

    /**
    * Attempts to unpack this configuration object from a string (that is
    * likely to come out from a config file). Returns true if the string
    * was in a valid format and the load operation succeeded, false otherwise.
    */
    bool loadFromString(const QString &data);

    /**
    * (Re)generates a (hopefully) unique identifier for this option set.
    * Please note that this function is reserved to this class and to
    * Configure*Dialog instances which need it for cloning option sets.
    * You shouldn't need to call it.
    */
    void generateUniqueId();

    bool readOnly() const
    {
        return mReadOnly;
    }
    void setReadOnly(bool b)
    {
        mReadOnly = b;
    }

protected:
    /**
    * Saves the inner contents of this option set to the specified data stream.
    * The implementation of this method MUST be provided by derived classes.
    */
    virtual void save(QDataStream &s) const = 0;

    /**
    * Loads the inner contents of this option set from the specified data stream.
    * The implementation of this method MUST be provided by derived classes
    * and must return true in case of success and false in case of load failure.
    */
    virtual bool load(QDataStream &s) = 0;
};

} // namespace Core

} // namespace MessageList

#endif //!__MESSAGELIST_CORE_OPTIONSET_H__
