/*
    kopeteplugindataobject.h - Kopete Plugin Data Object

    Copyright (c) 2003-2004 by Olivier Goffart       <ogoffart@ tiscalinet.be>
    Copyright (c) 2003      by Martijn Klingens      <klingens@kde.org>
    Copyright (c) 2004      by Richard Smith         <kde@metafoo.co.uk>
    Kopete    (c) 2002-2004 by the Kopete developers <kopete-devel@kde.org>

    *************************************************************************
    *                                                                       *
    * This library is free software; you can redistribute it and/or         *
    * modify it under the terms of the GNU Lesser General Public            *
    * License as published by the Free Software Foundation; either          *
    * version 2 of the License, or (at your option) any later version.      *
    *                                                                       *
    *************************************************************************
*/

#ifndef KOPETEPLUGINDATAOBJECT_H
#define KOPETEPLUGINDATAOBJECT_H

#include <tqobject.h>
#include <tqdom.h>

#include "kopete_export.h"

namespace Kopete {

class Plugin;


/**
 * @author Olivier Goffart  <ogoffart@ tiscalinet.be>
 *
 * This is the base class for  base elements of the contactlist.
 * His purpose is to share the code between @ref Group and @ref MetaContact
 *
 * It handle the saving and loading of plugin data from the contactlist.
 * Plugins may set custom datas to metaocntacts or groups by calling @ref setPluginData
 * and may retreive them with @ref pluginData
 *
 * It also allow to store an icon for this element.
 */
class KOPETE_EXPORT ContactListElement : public TQObject  /* public KopeteNotifyDataObject */
{
	Q_OBJECT
  

protected:
	ContactListElement( TQObject *parent = 0L, const char *name = 0L );
	~ContactListElement();


public:

	/**
	 * Set the plugin-specific data.
	 * The data in the provided TQMap is a set of key/value pairs.
	 * Note that protocol plugins usually shouldn't use this method, but
	 * reimplement @ref Contact::serialize() instead. This method
	 * is called by @ref Protocol for those classes.
	 *
	 * WARNING: This erases all old data stored for this object!
	 *          You may want to consider the @ref setPluginData() overload
	 *          that takes a single field as parameter.
	 */
	void setPluginData( Plugin *plugin, const TQMap<TQString, TQString> &value );

	/**
	 * Convenience method to store or change only a single field of the
	 * plugin data. As with the other @ref setPluginData() method, protocols
	 * are advised not to use this method and reimplement
	 * @ref Contact::serialize() instead.
	 *
	 * Note that you should save the file after adding data or it will get lost.
	 */
	void setPluginData( Plugin *plugin, const TQString &key, const TQString &value );

	/**
	 * Get the settings as stored previously by calls to @ref setPluginData()
	 *
	 * Note that calling this method for protocol plugins that use the
	 * @ref Contact::serialize() API may yield unexpected results.
	 */
	TQMap<TQString, TQString> pluginData( Plugin *plugin ) const;

	/**
	 * Convenience method to retrieve only a single field from the plugin
	 * data. See @ref setPluginData().
	 *
	 * Note that plugin data is accessible only after it has been loaded
	 * from the XML file. Don't call this method before then (e.g. in
	 * constructors).
	 */
	TQString pluginData( Plugin *plugin, const TQString &key ) const;

	/**
	 * The various icon states. Some state are reserved for Groups,
	 * other for metacontact.
	 * 'None' is the default icon.
	 */
	enum IconState { None, Open, Closed, Online, Away, Offline, Unknown };

	/**
	 * return the icon for this object, in the given state.
	 * if there is no icon registered for this state, the None icon is used
	 * if available
	 */
	TQString icon( IconState state = None ) const;

	/**
	 * Set the icon in the given state
	 * To clear an entry, set a TQString()
	 */
	void setIcon( const TQString &icon, IconState = None );

	/**
	 * return if yes or no the user wants to display some custom icon.
	 * you can use @ref icon() to know the icons to uses
	 */
	bool useCustomIcon() const;

	/**
	 * set if the user want to show custom icon he set with @ref setIcon
	 * this does not clear icons string if you set false
	 */
	void setUseCustomIcon( bool useCustomIcon );

signals:
	/**
	 * The plugin data was changed (by a plugin)
	 */
	void pluginDataChanged();

	/**
	 * The icon to use for some state has changed
	 */
	void iconChanged( Kopete::ContactListElement::IconState, const TQString & );

	/**
	 * The visual appearance of some of our icons has changed
	 */
	void iconAppearanceChanged();

	/**
	 * The useCustomIcon property has changed
	 */
	void useCustomIconChanged( bool useCustomIcon );

protected:
	/**
	 * Return a XML representation of plugin data
	 */
	const TQValueList<TQDomElement> toXML();

	/**
	 * Load plugin data from one Dom Element:
	 * It should be a <plugin-data> element or a <custom-icons> element. if not, nothing will happen
	 * @return true if something has ben loaded. false if the element was not a fine
	 */
	bool fromXML( const TQDomElement &element );

private:
	class Private;
	Private *d;
};

} //END namespace Kopete

#endif