// -*- c++ -*-

#ifndef XMLACTIONCLIENT_H
#define XMLACTIONCLIENT_H

#include <qobject.h>
#include <qxml.h>
#include <qmap.h>

class KActionCollection;
class KAction;

namespace KJSEmbed {

class XMLActionHandler;
class XMLActionRunner;
class XMLActionClient;

/**
 * Represents a script.
 */
class XMLActionScript
{
public:
    bool isValid() const { return !type.isEmpty(); }
    void clear() { src = type = text = QString::null; }

    QString src;
    QString type;
    QString text;
};

/**
 * Abstract class implemented by classes that can run scripts.
 */
class XMLActionRunner
{
public:
    virtual bool run( XMLActionClient *client, const XMLActionScript &script );
};

/**
 * Loads actions from an XML file using SAX.
 */
class XMLActionClient : public QObject
{
    Q_OBJECT

public:

    XMLActionClient( QObject *parent=0, const char *name=0 );
    virtual ~XMLActionClient();

    KActionCollection *actionCollection() const { return ac; }
    void setActionCollection( KActionCollection *acts ) { ac = acts; }

    XMLActionRunner *runner() const { return actrun; }
    void setRunner( XMLActionRunner *r ) { if (actrun) delete actrun; actrun = r; }

    /** Loads actions from the named XML file. Returns true on success. */
    bool load( const QString &filename );

    /** Loads actions from the named XML file. Returns true on success. */
    bool load( XMLActionHandler *handler, const QString &filename );

    /** Runs the named script. */
    bool run( const QString &name );

    /** Returns the named script. */
    XMLActionScript script( const QString &name ) const { return scripts[name]; }

    /** Calls XMLActionRunner::run(). */
    bool run( const XMLActionScript &script );

    /** Binds a name to a script. */
    virtual bool bind( const QString &name, const XMLActionScript &script );

    /** Binds an action to a script. */
    virtual bool bind( KAction *act, const XMLActionScript &script );

protected slots:
    /**
     * Called when a bound action is activated to invoke the script with the
     * sender's name.
     */
    void action_activated();

private:
    KActionCollection *ac;
    XMLActionRunner *actrun;
    QMap<QString, XMLActionScript> scripts;
};

/**
 * SAX handler for loading actions from XML.
 *
 * The following tags are supported:
 *
 * actionset ( header? action* )
 * header ( name | label | icons | script )
 * action ( (header | name | label | icons | shortcut | group | whatsthis | statustext | type | script | data)+ )
 * type ( #CDATA )
 * label ( #CDATA | text )
 * icons ( #CDATA )
 * shortcut ( #CDATA | text )
 * whatsthis ( #CDATA | text )
 * group ( #CDATA )
 *     exclusive    defaults to false
 * name ( #CDATA )
 * text ( #CDATA )
 * data ( item+ )
 * item ( #CDATA | text )
 * script ( #CDATA )
 *     type    type of script
 *     src     url of script file (optional)
 *
 * Unknown tags are ignored, so subclasses can define new ones if they
 * want to store additional data.
 */
class XMLActionHandler : public QXmlDefaultHandler
{
public:
    XMLActionHandler( XMLActionClient *ac );

    virtual bool startElement( const QString &ns, const QString &ln, const QString &qn,
			       const QXmlAttributes &attrs );
    virtual bool endElement( const QString &ns, const QString &ln, const QString &qn );
    virtual bool characters( const QString &chars );

    /** Called when an action tag is closed. */
    void defineAction();

    XMLActionClient *client() const { return ac; }

    /** Creates a KAction based on the values read from the XML. */
    virtual KAction *createAction( KActionCollection *parent );

protected:
    /**
     * Structure containing information gathered about an action.
     */
    struct ActionData {
	ActionData() { clear(); }

	void clear() {
	    text = icons = keys = name = group = whatsthis = status = QString::null;
	    exclusive = false;
	    script.clear();
	}

	QString type;
	QString text;
	QString icons;
	QString keys;
	QString name;
	QString group;
	bool exclusive;
	QString status;
	QString whatsthis;
	XMLActionScript script;
	QStringList items;
    };

    ActionData *actionData() { return &ad; }

private:
    XMLActionClient *ac;
    QString cdata;
    bool inAction;
    ActionData ad;
};

}; // namespace KJSEmbed

#endif // XMLACTIONCLIENT_H