/*
 * Copyright (C) 2001-2008 Justin Karneges, Martin Hostettler
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

// Generic tab completion support code.

 #ifndef TABCOMPLETION_H
#define TABCOMPLETION_H

#include <QObject>

#include "msgmle.h"

class TabCompletion : public QObject
{
Q_OBJECT
public:
	TabCompletion(QObject *parent = 0);
	~TabCompletion();

	void setTextEdit(QTextEdit* mle);
	QTextEdit* getTextEdit();

	virtual void reset();
	void tryComplete();

protected:
	QString toComplete_;
	bool atStart_;

	virtual void setup(QString str, int pos, int &start, int &end);
	virtual QStringList possibleCompletions()=0;
	virtual QStringList allChoices(QString &guess)=0;

	virtual void highlight(bool set);
	QColor highlight_;

private:


	QString longestCommonPrefix(QStringList list);
	QString suggestCompletion(bool *replaced);

	void moveCursorToOffset(QTextCursor &cur, int offset, QTextCursor::MoveMode mode = QTextCursor::MoveAnchor);

	enum TypingStatus {
		Typing_Normal,
		Typing_TabPressed,	// initial completion
		Typing_TabbingCompletions, // switch to tab through multiple
		Typing_MultipleSuggestions
	};

	QTextCursor replacementCursor_;
	TypingStatus typingStatus_;
	QStringList suggestedCompletion_;
	int  suggestedIndex_;

	QTextEdit* textEdit_;
};

#endif
