/* [DESTRUCTUR] Destruction de l'animation
=========================================================*/
xSpriteAnimation::~xSpriteAnimation(){
	SDL_DestroyTexture( _texture );
	_manager = NULL;
	_texture = NULL;
}

/* [CONSTRUCTOR] Construction de l'animation (chargement)
=========================================================*/
xSpriteAnimation::xSpriteAnimation(xManager *manager, const char *url, SDL_Rect viewport){
	/* (1) Definition des attributs */
	_manager = manager;
	_texture = NULL;

	_clip = viewport;


	/* (2) On charge le spritesheet */
	_texture = IMG_LoadTexture( _manager->renderer(), url );

	// Gestion erreur
	if( _texture == NULL )
		return;

}

/* [ADDFRAME] Ajout d'une frame d'animation
=========================================================*/
void xSpriteAnimation::addFrame(float x, float y){

	// On ajoute une frame
	_frames.push_back( (SDL_Rect){
		(int) x*_clip.w,
		(int) y*_clip.h,
		(int) _clip.w,
		(int) _clip.h
	});

}





/* [TRHEAD] Process de l'animation
=========================================================*/
void xSpriteAnimationProcess(xSpriteAnimation *xSA, int t, int flags){
	int length = xSA->_frames.size();
	int timer = 0;
	int step  = 1;
	int start = 0;
	int stop = length;

	while( flags&SPRITE_ANIM_INFINITE ){

		/* (1) Pour chaque sprite */
		for( int i = start ; i != stop ; i+=step ){
			timer = SDL_GetTicks();


			// On met a jour la frame
			xSA->_frame = xSA->_frames[i];


			if( SDL_GetTicks()-timer < t )
				SDL_Delay( t - (SDL_GetTicks()-timer) );
		}

		/* (2) Gestion des flags */
			
		// SPRITE_ANIM_REVERSE
		if( flags&SPRITE_ANIM_REVERSE ){
			step *= -1;
			start = (step==1) ? 0 : length-1;
			stop  = (step==1) ? length-1 : 0;
		}

	}


	/* (n) On termine le thread */
	return;
}







/* [START] Ajoute l'animation au rendu
=========================================================*/
void xSpriteAnimation::start(int t, int flags){
	/* (1) On ajoute le sprite au rendu */
	_manager->push(_texture, &_frame, &_clip);

	/* (2) On lance l'animation */
	_animation = new thread(xSpriteAnimationProcess, this, t, flags);

	// On attends pas le thread
	_animation->detach();
}



/* [STOP] Arrete l'animation
=========================================================*/
void xSpriteAnimation::stop(){
	delete _animation;
}