/* tool.h
 *
 * Micropolis, Unix Version.  This game was released for the Unix platform
 * in or about 1990 and has been modified for inclusion in the One Laptop
 * Per Child program.  Copyright (C) 1989 - 2007 Electronic Arts Inc.  If
 * you need assistance with this program, you may contact:
 *   http://wiki.laptop.org/go/Micropolis  or email  micropolis@laptop.org.
 *
 * 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 3 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/>.
 *
 *             ADDITIONAL TERMS per GNU GPL Section 7
 *
 * No trademark or publicity rights are granted.  This license does NOT
 * give you any right, title or interest in the trademark SimCity or any
 * other Electronic Arts trademark.  You may not distribute any
 * modification of this program using the trademark SimCity or claim any
 * affliation or association with Electronic Arts Inc. or its employees.
 *
 * Any propagation or conveyance of this program must include this
 * copyright notice and these terms.
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 * If you convey this program (or any modifications of it) and assume
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 * versions of the program must be marked as such and not identified as
 * the original program.
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 * This disclaimer supplements the one included in the General Public
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 * OF ANY KIND, AND YOUR USE IS AT YOUR SOLE RISK.  THE ENTIRE RISK OF
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 * NOT APPLY TO YOU.
 */

/** 
 * @file tool.h
 * @brief Defines tools, building properties, and tool effects for the
 * Micropolis game.
 *
 * This header file includes definitions for various tools used in the
 * game, along with the properties of buildings and the effects tools
 * have on the game's world. It encompasses the core functionalities
 * of tools, such as building, bulldozing, and querying, and their
 * impact on the game's map and financial aspects. The classes and
 * enumerations in this file form an integral part of the game's
 * interaction mechanics, allowing players to modify and interact with
 * the game world.
 */


#ifndef _H_TOOL
#define _H_TOOL


////////////////////////////////////////////////////////////////////////


#include <map>
#include <list>


////////////////////////////////////////////////////////////////////////
// Forward declarations


class Micropolis;


////////////////////////////////////////////////////////////////////////


/** Value of a tile in the map array incuding the #MapTileBits. */
typedef unsigned short MapValue;


/**
 * Value of a tile in the map array excluding the #MapTileBits (that is, just
 * a value from #MapCharacters).
 */
typedef unsigned short MapTile;


/**
 * Status bits of a map tile.
 * @see MapTile MapCharacters MapTile MapValue
 * @todo #ALLBITS should end with MASK.
 * @todo Decide what to do with #ANIMBIT (since sim-backend may not be the
 *       optimal place to do animation).
 * @todo How many of these bits can be derived from the displayed tile?
 */
enum MapTileBits {
    PWRBIT  = 0x8000, ///< bit 15, tile has power.
    CONDBIT = 0x4000, ///< bit 14. tile can conduct electricity.
    BURNBIT = 0x2000, ///< bit 13, tile can be lit.
    BULLBIT = 0x1000, ///< bit 12, tile is bulldozable.
    ANIMBIT = 0x0800, ///< bit 11, tile is animated.
    ZONEBIT = 0x0400, ///< bit 10, tile is the center tile of the zone.

    /// Mask for the bits-part of the tile
    ALLBITS = ZONEBIT | ANIMBIT | BULLBIT | BURNBIT | CONDBIT | PWRBIT,
    LOMASK = 0x03ff, ///< Mask for the #Tiles part of the tile

    BLBNBIT   = BULLBIT | BURNBIT,
    BLBNCNBIT = BULLBIT | BURNBIT | CONDBIT,
    BNCNBIT   =           BURNBIT | CONDBIT,
};


/**
 * Available tools.
 *
 * These describe the wand values, the object dragged around on the screen.
 */
enum EditingTool {
    TOOL_RESIDENTIAL,
    TOOL_COMMERCIAL,
    TOOL_INDUSTRIAL,
    TOOL_FIRESTATION,
    TOOL_POLICESTATION,
    TOOL_QUERY,
    TOOL_WIRE,
    TOOL_BULLDOZER,
    TOOL_RAILROAD,
    TOOL_ROAD,
    TOOL_STADIUM,
    TOOL_PARK,
    TOOL_SEAPORT,
    TOOL_COALPOWER,
    TOOL_NUCLEARPOWER,
    TOOL_AIRPORT,
    TOOL_NETWORK,
    TOOL_WATER,
    TOOL_LAND,
    TOOL_FOREST,

    TOOL_COUNT,
    TOOL_FIRST = TOOL_RESIDENTIAL,
    TOOL_LAST = TOOL_FOREST,
};


/** Set of modifications in the world accessible by position. */
typedef std::map<Position, MapValue> WorldModificationsMap;


/** List of messages to send to the frontend. */
typedef std::list<FrontendMessage *> FrontendMessages;

/**
 * Class for storing effects of applying a tool to the world.
 *
 * When applying a tool, two things change:
 *  - The world map.
 *  - The funds of the player.
 *  - Messages sent to the player and the front-end.
 *  - Sounds played for the player.
 *
 * The funds gives a decision problem. To decide whether the tool can be
 * applied, you need to know the cost. To know the cost you need to know the
 * exact changes being made.
 * The simplest way to compute the exact changes is to simply apply the tool to
 * the world. This holds especially when tools get stacked on top of each
 * other.
 *
 * This class provides an easy way out, greatly simplifying the problem.
 * All tools do not modify the world directly, but instead put their results
 * in an instance of this class, thus collecting all the modifications.
 * After the whole operation is 'done', the #ToolEffects instance can tell the
 * precise cost and what has been changed in the world. At that moment, the
 * yes/no decision can be made, and the effects can be copied to the real map
 * and funds.
 *
 * @todo Extend the class for storing messages and sounds.
 */
class ToolEffects
{
public:
    ToolEffects(Micropolis *sim);
    ~ToolEffects();

    void clear();
    void modifyWorld();
    bool modifyIfEnoughFunding();

    MapValue getMapValue(const Position& pos) const;
    inline MapValue getMapValue(int x, int y) const;
    inline MapTile getMapTile(const Position& pos) const;
    inline MapTile getMapTile(int x, int y) const;
    inline int getCost() const;

    inline void addCost(int amount);
    void setMapValue(const Position& pos, MapValue mapVal);
    inline void setMapValue(int x, int y, MapValue mapVal);
    inline void addFrontendMessage(FrontendMessage *msg);

private:
    Micropolis *sim; ///< Simulator to get map values from, and to apply changes.
    int cost; ///< Accumulated costs.
    WorldModificationsMap modifications; ///< Collected world modifications.
    FrontendMessages frontendMessages; ///< Collected messages to send.
};


////////////////////////////////////////////////////////////////////////


/**
 * Get the tile of a map position.
 * @param pos Position being queried.
 * @return Tile at the specified position.
 *
 * @pre Position must be within map limits
 */
inline MapTile ToolEffects::getMapTile(const Position& pos) const
{
    return this->getMapValue(pos) & LOMASK;
}


/**
 * Get the tile of a map position.
 * @param x Horizontal coordinate of position being queried.
 * @param y Vertical coordinate of position being queried.
 * @return Tile at the specified position.
 *
 * @pre Position must be within map limits
 */
inline MapValue ToolEffects::getMapTile(int x, int y) const
{
    return this->getMapValue(Position(x, y)) & LOMASK;
}


/**
 * Get the total cost collected so far.
 * @return Total cost.
 */
inline int ToolEffects::getCost() const
{
    return this->cost;
}


/**
 * Add some amount to the total.
 */
inline void ToolEffects::addCost(int amount)
{
    assert(amount >= 0); // To be on the safe side.
    this->cost += amount;
}


/**
 * Get the value of a map position.
 * @param x Horizontal coordinate of position being queried.
 * @param y Vertical coordinate of position being queried.
 * @return Map value at the specified position.
 *
 * @pre Position must be within map limits
 */
inline MapValue ToolEffects::getMapValue(int x, int y) const
{
    return this->getMapValue(Position(x, y));
}


/**
 * Set a new map value.
 * @param pos    Position to set.
 * @param x      Horizontal coordinate of position to set.
 * @param y      Vertical coordinate of position to set.
 * @param mapVal Value to set.
 */
inline void ToolEffects::setMapValue(int x, int y, MapValue mapVal)
{
    this->setMapValue(Position(x, y), mapVal);
}


/**
 * Add a #FrontendMessage to the queue to send.
 * @param msg Frontend message to send.
 */
inline void ToolEffects::addFrontendMessage(FrontendMessage *msg)
{
    this->frontendMessages.push_back(msg);
}


////////////////////////////////////////////////////////////////////////


/** Properties of a building with respect to its construction. */
class BuildingProperties
{
public:
    BuildingProperties(int xs, int ys, MapTile base, EditingTool tool,
                       std::string tName, bool anim);
    ~BuildingProperties();

    const int sizeX; ///< Number of tiles in horizontal direction.
    const int sizeY; ///< Number of tiles in vertical direction.

    const MapTile baseTile; ///< Tile value at top-left in the map.

    const EditingTool tool; ///< Tool needed for making the building.

    /** Name of the tool needed for making the building. */
    std::string toolName;

    const bool buildingIsAnimated; ///< Building has animated tiles.
};


////////////////////////////////////////////////////////////////////////


#endif