/*
 * 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/>.
 */

#include <element.h>

int update_BCLN(UPDATE_FUNC_ARGS) {
	if (!parts[i].life && pv[y/CELL][x/CELL]>4.0f)
		parts[i].life = rand()%40+80;
	if (parts[i].life)
	{
		float advection = 0.1f;
		parts[i].vx += advection*vx[y/CELL][x/CELL];
		parts[i].vy += advection*vy[y/CELL][x/CELL];
	}
	if (parts[i].ctype<=0 || parts[i].ctype>=PT_NUM || (parts[i].ctype==PT_LIFE && (parts[i].tmp<0 || parts[i].tmp>=NGOLALT)))
	{
		int r, rx, ry;
		for (rx=-1; rx<2; rx++)
			for (ry=-1; ry<2; ry++)
				if (x+rx>=0 && y+ry>=0 && x+rx<XRES && y+ry<YRES)
				{
					r = photons[y+ry][x+rx];
					if (!r)
						r = pmap[y+ry][x+rx];
					if (!r)
						continue;
					if ((r&0xFF)!=PT_CLNE && (r&0xFF)!=PT_PCLN &&
				        (r&0xFF)!=PT_BCLN && (r&0xFF)!=PT_STKM &&
				        (r&0xFF)!=PT_PBCN && (r&0xFF)!=PT_STKM2 &&
				        (r&0xFF)<PT_NUM)
					{
						parts[i].ctype = r&0xFF;
						if ((r&0xFF)==PT_LIFE || (r&0xFF)==PT_LAVA)
							parts[i].tmp = parts[r>>8].ctype;
					}
				}
	}
	else {
		if (parts[i].ctype==PT_LIFE) create_part(-1, x+rand()%3-1, y+rand()%3-1, parts[i].ctype|(parts[i].tmp<<8));
		else
		{
			int np = create_part(-1, x+rand()%3-1, y+rand()%3-1, parts[i].ctype);
			if (np>=0)
			{
				if (parts[i].ctype==PT_LAVA && parts[i].tmp>0 && parts[i].tmp<PT_NUM && ptransitions[parts[i].tmp].tht==PT_LAVA)
					parts[np].ctype = parts[i].tmp;
			}
		}
	}
	return 0;
}