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Ability.h

/*
 * Ability.h -- class interface for ability scores
 * Copyright (C) 2002  Eric Lemings <elemings@users.sourceforge.net>
 *
 * This software 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 software 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 software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA
 *
 * RCS: $Id: Ability.h,v 1.7 2003/04/18 01:41:02 elemings Exp $
 */

#ifdef __cplusplus

#  ifndef OGS_CORE_ABILITY_H
#    define OGS_CORE_ABILITY_H

#    include <ogs/Support.h>
#    include <ogs/core/Die.h>
#    include <ogs/core/Experience.h>
#    include <ogs/core/Modifiers.h>
#    include <ogs/core/Namespace.h>

OGS_BEGIN_CORE_NAMESPACE

class Ability: public ogs::support::Object,
               private ogs::support::Observer {
  public:
    enum Type {
      STR = 1,

      DEX,

      CON,

      INT,

      WIS,

      CHA,

      NUM = 6
    };

    typedef unsigned short Score;

    struct Method;
    struct StandardMethod;
    struct AverageMethod;
    struct HighPoweredMethod;
    struct DirectMethod;

    class Event;

    static bool isValidType (int i);
    static unsigned getIncreaseCount (XP::Level xpLevel);
    static XP::Level getIncreaseCountLevel (unsigned increaseCount);

    Ability (Type type);
    Ability (Type type, Method& method);

    Type getType () const;
    Score getOriginalScore () const;
    Modifiers& getModifiers ();
    Score getCurrentScore () const;
    const Modifier& getModifier () const;
    Modifier& getModifier ();

  private:
    Type _type;
    Score _originalScore;
    Modifiers _modifiers;
    Modifier _modifier;

    static Score rollStandard ();
    static Score rollHighPowered ();

    static Modifier::Value getModifier (Score score);

    void handleEvent (ogs::support::Event& event);
};

struct Ability::Method {
  virtual Ability::Score operator() (Ability::Type type) = 0;

  virtual ~Method () { }
};

struct Ability::StandardMethod: public Ability::Method {
  Ability::Score operator() (Ability::Type) {
    return (Ability::rollStandard ());
  }
};

struct Ability::AverageMethod: public Ability::Method {
  Ability::Score operator() (Ability::Type) {
    return (Score (Die::roll (Die::d6, 3)));
  }
};

struct Ability::HighPoweredMethod: public Ability::Method {
  Ability::Score operator() (Ability::Type) {
    return (Ability::rollHighPowered ());
  }
};

struct Ability::DirectMethod: public Ability::Method {
  Ability::Score score;

  DirectMethod (Ability::Score score) {
    this->score = score;
  }

  Ability::Score operator() (Ability::Type) {
    return (score);
  }
};

inline bool
Ability::isValidType (int i) {
  return (i == STR || i == DEX || i == CON ||
          i == INT || i == WIS || i == CHA);
}

inline Modifier::Value
Ability::getModifier (Score score) {
  return (score / 2 - 5);
}

inline unsigned
Ability::getIncreaseCount (XP::Level xpLevel) {
  return (xpLevel == 0? 0: xpLevel / 4);
}

inline Ability::Type
Ability::getType () const {
  return (this->_type);
}

inline Ability::Score
Ability::getOriginalScore () const {
  return (this->_originalScore);
}

inline Modifiers&
Ability::getModifiers () {
  return (this->_modifiers);
}

inline Ability::Score
Ability::getCurrentScore () const {
  return (this->_originalScore + this->_modifiers.getValue ());
}

inline const Modifier&
Ability::getModifier () const {
  return (this->_modifier);
}

inline Modifier&
Ability::getModifier () {
  return (this->_modifier);
}

class Ability::Event: public Modifiers::Event {
  public:
    Ability::Score getPreviousScore () const;

  private:
    Ability::Score _score;

    Event (Ability& ability, Modifiers::Event& event);

    friend void Ability::handleEvent (ogs::support::Event& event);
};

inline Ability::Event::Event       (Ability& ability,
                                    Modifiers::Event& event):
  Modifiers::Event (event),
  _score (ability.getCurrentScore ()) {
  // empty constructor body
}

inline Ability::Score
Ability::Event::getPreviousScore () const {
  return (this->_score);
}

OGS_END_CORE_NAMESPACE

#  endif /* !defined OGS_CORE_ABILITY_H */

#endif /* defined __cplusplus */

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