/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * 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; version 2 of the License

 *

 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA

 */

/**

 * @file

 * @brief SmartLineEdit class definition

 */

#ifndef HEDGEWARS_SMARTLINEEDIT_H

#define HEDGEWARS_SMARTLINEEDIT_H

#include <QMap>

#include <QString>

#include <QStringList>

#include <QEvent>

#include <QKeyEvent>

#include <QRegExp>

#include "HistoryLineEdit.h"

/**

 * @brief {@link HistoryLineEdit} that features auto-completion with TAB key

 *         and clear with ESC key.

 *

 * Notes:

 * <ul>

 *   <li>A Keyword can either be a command (if first word) or

 *       a nickname (completed regardless of position in text).</li>

 * </ul>

 *

 * @author sheepluva

 * @since 0.9.17

 */

class SmartLineEdit : public HistoryLineEdit

{

        Q_OBJECT

    public:

        /**

        * @brief Class constructor.

        * @param parent parent QWidget.

        * @param maxHistorySize maximum amount of history entries kept.

        */

        SmartLineEdit(QWidget * parent = 0, int maxHistorySize = 64);

        /**

        * @brief Class destructor.

        */

        ~SmartLineEdit();

        /**

         * @brief Adds commands to the auto-completion feature.

         * @param commands list of commands to be added.

         */

        void addCommands(const QStringList & commands);

        /**

         * @brief Adds a single nickname to the auto-completion feature.

         * @param nickname name to be added.

         */

        void addNickname(const QString & nickname);

        /**

         * @brief Removes commands from the auto-completion feature.

         * @param commands list of commands to be removed.

         */

        void removeCommands(const QStringList & commands);

        /**

         * @brief Removes a single nickname from the auto-completion feature.

         * @param nickname name to be removed.

         */

        void removeNickname(const QString & nickname);

        /**

         * @brief Forget all keywords and input history.

         */

        void reset();

    protected:

        /**

         * @brief Overrides method of parent class.

         * Forward pressed TAB to parent class' method (for focus handling etc)

         * only if line is empty.

         *

         * @param event the event.

         * @return returns true if the event was recognized.

         */

        virtual bool event(QEvent * event);

        /**

         * @brief Overrides method of parent class.

         * Autocompletes if TAB is reported as pressed key in the key event,

         * ESC leads to the contents being cleared.

         *

         * Other keys are forwarded to parent method.

         *

         * @param event the key event.

         */

        virtual void keyPressEvent(QKeyEvent * event);

    private:

        QRegExp m_whitespace; ///< regexp that matches a whitespace

        QStringList * m_cmds;  ///< list of recognized commands

        QStringList * m_nicks; ///< list of recognized nicknames

        /// recognized nicknames, sorted case-insensitive

        QMap<QString, QString> * m_sorted_nicks;

        // these variables contain information about the last replacement

        // they get reset whenever cursor is moved or text is changed

        QString m_beforeMatch; ///< the string that was just matched

        bool m_hasJustMatched; ///< whether this widget just did an auto-completion

        QString m_prefix; ///< prefix of the text replacement this widget just did

        QString m_postfix; ///< postfix of the text replacement this widget just did

        /**

         * @brief Autocompletes the contents based on the known commands and/or names.

         */

        void autoComplete();

    private slots:

        /**

         * @brief Resets the information about the last match and text replacement.

         */

        void resetAutoCompletionStatus();

};

#endif // HEDGEWARS_SMARTLINEEDIT_H