/*
 * Copyright 2007-2008 Thomas Gallinari <tg8187@yahoo.fr>
 * Copyright 2007-2008 Alexandre Galinier <alex.galinier@hotmail.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; 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/>.
 */

#ifndef GHOST_H
#define GHOST_H

#include "character.h"
#include "kapman.h"


/**
 * @brief This class represents a Ghost for kapman.
 */
class Ghost : public Character {

	Q_OBJECT
	
	public:
	
		/** The ghost possible states */
		enum State {
			HUNTER = 0,
			PREY = 1,
			EATEN = 2
		};

        /** The value of an Ghost */
        static const int POINTS;


	private:

		/** Max speed ratio, compared with the initial speed  */
		static const qreal MAX_SPEED_RATIO;

		/** The path to the Ghost image */
		QString m_imageId;
		
		/** The ghost current state */
		State m_state;
		
		/** A list of Cells to go to the camp from the current cell */
		QList<QPoint> m_pathToCamp;

	public:

		/**
		 * Creates a new Ghost instance.
		 * @param p_x the initial x-coordinate
		 * @param p_y the initial y-coordinate
		 * @param p_imageId path to the image of the related item
		 * @param p_maze the Maze the Ghost is on
		 */
		Ghost(qreal p_x, qreal p_y, const QString & p_imageId, Maze* p_maze);

		/**
		 * Deletes the Ghost instance.
		 */
		~Ghost();

		/**
		 * Updates the Ghost move.
		 */
		void updateMove();

		/**
		 * Updates the Ghost with a direction to follow.
		 * @param p_row x coordinate of the cell to reach
		 * @param p_col y coordinate of the cell to reach
		 */
		void updateMove(int p_row, int p_col);
		 
		/**
		 * Gets the path to the Ghost image.
		 * @return the path to the Ghost image
		 */
		QString getImageId() const;
		
		/**
		 * Gets the current state of the Ghost.
		 * @return the Ghost state
		 */
		State getState() const;
		
		/**
		 * Sets the Ghost state to the given value.
		 * @param p_state the new Ghost state
		 */
		void setState(Ghost::State p_state);
		
		 /**
		  * Manages the collison with the Kapman.
		  * @param p_kapman the instance of Kapman which collides with the Ghost
		  */
		 void doActionOnCollision(Kapman* p_kapman);

		/**
		 * Initializes the Ghost speed from the Character speed.
		 */
		void initSpeedInc();

	private:

		/**
		 * Makes the Ghost go up.
		 */
		void goUp();

		/**
		 * Makes the Ghost go down.
		 */
		void goDown();

		/**
		 * Makes the Ghost go to the right.
		 */
		void goRight();

		/**
		 * Makes the Ghost go to the left.
		 */
		void goLeft();

	signals:
	
		/**
		 * Emitted when the Kapman has lost a life.
		 */
		void lifeLost();
		
		/**
		 * Emitted when the Ghost has been eaten.
		 * @param p_ghost the eaten Ghost (this)
		 */
		void ghostEaten(Ghost* p_ghost);
		
		/**
		 * Emitted when the Ghost has changed his state.
		 */
		void stateChanged();
};

#endif