/*
 *  The Mana World
 *  Copyright 2004 The Mana World Development Team
 *
 *  This file is part of The Mana World.
 *
 *  The Mana World 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
 *  any later version.
 *
 *  The Mana World 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 The Mana World; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef MAP_H
#define MAP_H

#include <list>
#include <map>
#include <string>

const unsigned int DEFAULT_TILE_WIDTH = 32;
const unsigned int DEFAULT_TILE_HEIGHT = 32;

/**
 * A position along a being's path.
 * Used to compute each Path Nodes of the path.
 */
struct Position
{
    Position(int x, int y):
        x(x), y(y)
    { }

    int x;
    int y;
};

typedef std::list<Position> Path;
typedef Path::iterator PathIterator;

/**
 * A meta tile stores additional information about a location on a tile map.
 * This is information that doesn't need to be repeated for each tile in each
 * layer of the map.
 */
class MetaTile
{
    public:
        /**
         * Constructor.
         */
        MetaTile();

        // Pathfinding members
        int Fcost;              /**< Estimation of total path cost */
        int Gcost;              /**< Cost from start to this location */
        int Hcost;              /**< Estimated cost to goal */
        int whichList;          /**< No list, open list or closed list */
        int parentX;            /**< X coordinate of parent tile */
        int parentY;            /**< Y coordinate of parent tile */
        char blockmask;          /**< walkability bitfield */
};

/**
 * A location on a tile map. Used for pathfinding, open list.
 */
class Location
{
    public:
        /**
         * Constructor.
         */
        Location(int x, int y, MetaTile *tile);

        /**
         * Comparison operator.
         */
        bool operator< (const Location &loc) const;

        int x, y;
        MetaTile *tile;
};

/**
 * A tile map.
 */
class Map
{
    public:
        enum BlockType
        {
            BLOCKTYPE_NONE = -1,
            BLOCKTYPE_WALL,
            BLOCKTYPE_CHARACTER,
            BLOCKTYPE_MONSTER,
            NB_BLOCKTYPES
        };

        /**
         * Constructor that takes initial map size as parameters.
         */
        Map(int width = 0, int height = 0, int twidth = 32, int theight = 32);

        /**
         * Destructor.
         */
        ~Map();

        /**
         * Sets the size of the map. This will destroy any existing map data.
         */
        void setSize(int mWidth, int height);

        /**
         * Get tile reference.
         */
        MetaTile *getMetaTile(int x, int y);

        /**
         * Marks a tile as occupied
         */
        void blockTile(int x, int y, BlockType type);

        /**
         * Marks a tile as unoccupied
         */
        void freeTile(int x, int y, BlockType type);

        /**
         * Gets walkability for a tile with a blocking bitmask
         */
        bool getWalk(int x, int y, char walkmask = BLOCKMASK_WALL) const;

        /**
         * Tells if a tile location is within the map range.
         */
        bool contains(int x, int y) const;

        /**
         * Returns the width of this map.
         */
        int getWidth() const
        { return mWidth; }

        /**
         * Returns the height of this map.
         */
        int getHeight() const
        { return mHeight; }

        /**
         * Returns the tile width of this map.
         */
        int getTileWidth() const
        { return tileWidth; }

        /**
         * Returns the tile height used by this map.
         */
        int getTileHeight() const
        { return tileHeight; }

        /**
         * Returns a general map property defined in the map file
         */
        const std::string &getProperty(const std::string &key) const;

        /**
        * Sets a map property
        */
        void setProperty(const std::string& key, const std::string& val)
        { mProperties[key] = val; }

        /**
         * Find a path from one location to the next.
         */
        Path findPath(int startX, int startY,
                                      int destX, int destY,
                                      unsigned char walkmask,
                                      int maxCost = 20);

        /**
         * Finds a simple path from location to the next.
         */
        Path findSimplePath(int startX, int startY,
                                            int destX, int destY,
                                            unsigned char walkmask);

    private:
        /**
         * Blockmasks for different entities
         */
        static const unsigned char BLOCKMASK_WALL = 0x80;     // = bin 1000 0000
        static const unsigned char BLOCKMASK_CHARACTER = 0x01;// = bin 0000 0001
        static const unsigned char BLOCKMASK_MONSTER = 0x02;  // = bin 0000 0010
        int *mOccupation[NB_BLOCKTYPES];

        // map properties
        int mWidth, mHeight;
        int tileWidth, tileHeight;
        std::map<std::string, std::string> mProperties;

        // Pathfinding members
        MetaTile *mMetaTiles;
        int onClosedList, onOpenList;
};

#endif