/*
 *  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
 *
 *  $Id$
 */

#ifndef _TMW_ANIMATION_H
#define _TMW_ANIMATION_H

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

#include <libxml/tree.h>

#include "graphics.h"

class Image;
class Spriteset;

/**
 * A single frame in an animation, with a delay and an offset.
 */
struct AnimationPhase
{
    int image;
    unsigned int delay;
    int offsetX;
    int offsetY;
};

/**
 * An animation consists of several frames, each with their own delay and
 * offset.
 */
class Animation
{
    public:
        /**
         * Constructor.
         */
        Animation();

        void addPhase(int image, unsigned int delay, int offsetX, int offsetY);

        void update(unsigned int time);

        int getCurrentPhase() const;

        int getOffsetX() const { return (*iCurrentPhase).offsetX; };
        int getOffsetY() const { return (*iCurrentPhase).offsetY; };

        int getLength();

    protected:
        std::list<AnimationPhase> mAnimationPhases;
        std::list<AnimationPhase>::iterator iCurrentPhase;
        unsigned int mTime;
};

/**
 * An action consists of several animations, one for each direction.
 */
class Action
{
    public:
        /**
         * Constructor.
         */
        Action();

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

        /**
         * Sets the spriteset used by this action.
         */
        void
        setSpriteset(Spriteset *spriteset) { mSpriteset = spriteset; }

        /**
         * Returns the spriteset used by this action.
         */
        Spriteset*
        getSpriteset() const { return mSpriteset; }

        void
        setAnimation(const std::string& direction, Animation *animation);

        Animation*
        getAnimation(const std::string& direction) const;

    protected:
        Spriteset *mSpriteset;
        typedef std::map<std::string, Animation*> Animations;
        typedef Animations::iterator AnimationIterator;
        Animations mAnimations;
};

/**
 * Defines a class to load an animation.
 */
class AnimatedSprite
{
    public:
        /**
         * Constructor.
         */
        AnimatedSprite(const std::string& animationFile, int variant);

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

        /**
         * Sets a new action using the current direction.
         */
        void
        play(const std::string& action);

        /**
         * Plays an action in a specified time.
         */
        void
        play(const std::string& action, int time);

        /**
         * Inform the animation of the passed time so that it can output the
         * correct animation phase.
         */
        void update(int time);

        /**
         * Draw the current animation phase at the coordinates given in screen
         * pixels.
         */
        bool
        draw(Graphics* graphics, Sint32 posX, Sint32 posY) const;

        /**
         * gets the width in pixels of the current animation phase.
         */
        int
        getWidth() const;

        /**
         * gets the height in pixels of the current animation phase.
         */
        int
        getHeight() const;

        /**
         * Sets the direction.
         */
        void
        setDirection(const std::string& direction)
        {
            mDirection = direction;
        }

    protected:
        /**
         * When there are no animations defined for the action "complete", its
         * animations become a copy of those of the action "with".
         */
        void
        substituteAction(const std::string& complete,
                         const std::string& with);

        typedef std::map<std::string, Spriteset*> Spritesets;
        typedef Spritesets::iterator SpritesetIterator;
        Spritesets mSpritesets;
        typedef std::map<std::string, Action*> Actions;
        Actions mActions;
        Action *mAction;
        std::string mDirection;
        int mLastTime;
        float mSpeed;

    private:
        /**
         * Gets an integer property from an xmlNodePtr.
         *
         * TODO: Same function is present in MapReader. Should probably be
         * TODO: shared in a static utility class.
         */
        static int
        getProperty(xmlNodePtr node, const char* name, int def);

        /**
         * Gets a string property from an xmlNodePtr.
         */
        static std::string
        getProperty(xmlNodePtr node, const char* name, const std::string& def);
};

#endif