/* This file is part of the KDE libraries
    Copyright (C) 2000 David Smith  <dsmith@algonet.se>

    This class was inspired by a previous KUrlCompletion by
    Henner Zeller <zeller@think.de>

    This library 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 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KURLCOMPLETION_H
#define KURLCOMPLETION_H

#include <kcompletion.h>
#include <kio/jobclasses.h>
#include <QtCore/QString>

class QStringList;
class KUrl;
class KUrlCompletionPrivate;

/**
 * This class does completion of URLs including user directories (~user)
 * and environment variables.  Remote URLs are passed to KIO.
 *
 * @short Completion of a single URL
 * @author David Smith <dsmith@algonet.se>
 */
class KIO_EXPORT KUrlCompletion : public KCompletion
{
	Q_OBJECT

public:
	/**
	 * Determines how completion is done.
	 * @li ExeCompletion - executables in $PATH or with full path.
	 * @li FileCompletion - all files with full path or in dir(), URLs
	 * are listed using KIO.
	 * @li DirCompletion - Same as FileCompletion but only returns directories.
	 */
	enum Mode { ExeCompletion=1, FileCompletion, DirCompletion };

	/**
	 * Constructs a KUrlCompletion object in FileCompletion mode.
	 */
	KUrlCompletion();
	/**
	 * This overloaded constructor allows you to set the Mode to ExeCompletion
	 * or FileCompletion without using setMode. Default is FileCompletion.
	 */
	KUrlCompletion(Mode);
	/**
	 * Destructs the KUrlCompletion object.
	 */
	virtual ~KUrlCompletion();

	/**
	 * Finds completions to the given text.
	 *
	 * Remote URLs are listed with KIO. For performance reasons, local files
	 * are listed with KIO only if KURLCOMPLETION_LOCAL_KIO is set.
	 * The completion is done asyncronously if KIO is used.
	 *
	 * Returns the first match for user, environment, and local dir completion
	 * and QString() for asynchronous completion (KIO or threaded).
	 *
	 * @param text the text to complete
	 * @return the first match, or QString() if not found
	 */
	virtual QString makeCompletion(const QString &text); // KDE4: remove return value, it's often null due to threading

	/**
	 * Sets the current directory (used as base for completion).
	 * Default = $HOME.
	 * @param dir the current directory, either as a path or URL
	 */
	virtual void setDir(const QString &dir);

	/**
	 * Returns the current directory, as it was given in setDir
	 * @return the current directory (path or URL)
	 */
	virtual QString dir() const;

	/**
	 * Check whether asynchronous completion is in progress.
	 * @return true if asynchronous completion is in progress
	 */
	virtual bool isRunning() const;

	/**
	 * Stops asynchronous completion.
	 */
	virtual void stop();

	/**
	 * Returns the completion mode: exe or file completion (default FileCompletion).
	 * @return the completion mode
	 */
	virtual Mode mode() const;

	/**
	 * Changes the completion mode: exe or file completion
	 * @param mode the new completion mode
	 */
	virtual void setMode( Mode mode );

	/**
	 * Checks whether environment variables are completed and
	 * whether they are replaced internally while finding completions.
	 * Default is enabled.
	 * @return true if environment vvariables will be replaced
	 */
	virtual bool replaceEnv() const;

	/**
	 * Enables/disables completion and replacement (internally) of
	 * environment variables in URLs. Default is enabled.
	 * @param replace true to replace environment variables
	 */
	virtual void setReplaceEnv( bool replace );

	/**
	 * Returns whether ~username is completed and whether ~username
	 * is replaced internally with the user's home directory while
	 * finding completions. Default is enabled.
	 * @return true to replace tilde with the home directory
	 */
	virtual bool replaceHome() const;

	/**
	 * Enables/disables completion of ~username and replacement
	 * (internally) of ~username with the user's home directory.
	 * Default is enabled.
	 * @param replace true to replace tilde with the home directory
	 */
	virtual void setReplaceHome( bool replace );

	/**
	 * Replaces username and/or environment variables, depending on the
	 * current settings and returns the filtered url. Only works with
	 * local files, i.e. returns back the original string for non-local
	 * urls.
	 * @param text the text to process
	 * @return the path or URL resulting from this operation. If you
         * want to convert it to a KUrl, use KUrl::fromPathOrUrl.
	 */
	QString replacedPath( const QString& text ) const;

	/**
	 * @internal I'll let ossi add a real one to KShell :)
	*/
	static QString replacedPath( const QString& text,
                                     bool replaceHome, bool replaceEnv = true );

protected:
	// Called by KCompletion, adds '/' to directories
	void postProcessMatch( QString *match ) const;
	void postProcessMatches( QStringList *matches ) const;
	void postProcessMatches( KCompletionMatches* matches ) const;

	virtual void customEvent( QEvent *e );

private:
	KUrlCompletionPrivate* const d;

    Q_PRIVATE_SLOT( d, void _k_slotEntries( KIO::Job*, const KIO::UDSEntryList& ) )
    Q_PRIVATE_SLOT( d, void _k_slotIOFinished( KJob* ) )
};

#endif // KURLCOMPLETION_H
