/*

 *  The Mana World

 *  Copyright (C) 2004  The Mana World Development Team

 *

 *  This file is part of The Mana World.

 *

 *  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

 *  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, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include "animatedsprite.h"

#include "graphics.h"

#include "log.h"

#include "resources/action.h"

#include "resources/animation.h"

#include "resources/image.h"

#include "resources/resourcemanager.h"

#include "utils/xml.h"

#include <cassert>

AnimatedSprite::AnimatedSprite(SpriteDef *sprite):

    mDirection(DIRECTION_DOWN),

    mLastTime(0),

    mFrameIndex(0),

    mFrameTime(0),

    mSprite(sprite),

    mAction(0),

    mAnimation(0),

    mFrame(0),

    mAlpha(1.0f)

{

    assert(mSprite);

    // Take possession of the sprite

    mSprite->incRef();

    // Play the stand animation by default

    play(ACTION_STAND);

}

AnimatedSprite *AnimatedSprite::load(const std::string &filename, int variant)

{

    ResourceManager *resman = ResourceManager::getInstance();

    SpriteDef *s = resman->getSprite(filename, variant);

    if (!s)

        return NULL;

    AnimatedSprite *as = new AnimatedSprite(s);

    s->decRef();

    return as;

}

AnimatedSprite::~AnimatedSprite()

{

    mSprite->decRef();

}

void AnimatedSprite::reset()

{

    mFrameIndex = 0;

    mFrameTime = 0;

    mLastTime = 0;

}

void AnimatedSprite::play(SpriteAction spriteAction)

{

    Action *action = mSprite->getAction(spriteAction);

    if (!action)

        return;

    mAction = action;

    Animation *animation = mAction->getAnimation(mDirection);

    if (animation && animation != mAnimation && animation->getLength() > 0)

    {

        mAnimation = animation;

        mFrame = mAnimation->getFrame(0);

        reset();

    }

}

void AnimatedSprite::update(int time)

{

    // Avoid freaking out at first frame or when tick_time overflows

    if (time < mLastTime || mLastTime == 0)

        mLastTime = time;

    // If not enough time has passed yet, do nothing

    if (time <= mLastTime || !mAnimation)

        return;

    unsigned int dt = time - mLastTime;

    mLastTime = time;

    if (!updateCurrentAnimation(dt))

    {

        // Animation finished, reset to default

        play(ACTION_STAND);

    }

}

bool AnimatedSprite::updateCurrentAnimation(unsigned int time)

{

    if (!mFrame || Animation::isTerminator(*mFrame))

        return false;

    mFrameTime += time;

    while (mFrameTime > mFrame->delay && mFrame->delay > 0)

    {

        mFrameTime -= mFrame->delay;

        mFrameIndex++;

        if (mFrameIndex == mAnimation->getLength())

            mFrameIndex = 0;

        mFrame = mAnimation->getFrame(mFrameIndex);

        if (Animation::isTerminator(*mFrame))

        {

            mAnimation = 0;

            mFrame = 0;

            return false;

        }

    }

    return true;

}

bool AnimatedSprite::draw(Graphics *graphics, int posX, int posY) const

{

    if (!mFrame)

        return false;

    if (!mFrame->image)

      return false;

    if (mFrame->image->getAlpha() != mAlpha)

        mFrame->image->setAlpha(mAlpha);

    return graphics->drawImage(mFrame->image,

                               posX + mFrame->offsetX,

                               posY + mFrame->offsetY);

}

void AnimatedSprite::setDirection(SpriteDirection direction)

{

    if (mDirection != direction)

    {

        mDirection = direction;

        if (!mAction)

            return;

        Animation *animation = mAction->getAnimation(mDirection);

        if (animation && animation != mAnimation && animation->getLength() > 0)

        {

            mAnimation = animation;

            mFrame = mAnimation->getFrame(0);

            reset();

        }

    }

}

int AnimatedSprite::getWidth() const

{

    if (mFrame)

        return mFrame->image ? mFrame->image->getWidth() : 0;

    else

        return 0;

}

int AnimatedSprite::getHeight() const

{

    if (mFrame)

        return mFrame->image ? mFrame->image->getHeight() : 0;

    else

        return 0;

}