#include "element.h"

int update_ACID(UPDATE_FUNC_ARGS) {
	int r, rx, ry, trade, np;
	for (rx=-2; rx<3; rx++)
		for (ry=-2; ry<3; ry++)
			if (x+rx>=0 && y+ry>0 && x+rx<XRES && y+ry<YRES && (rx || ry))
			{
				r = pmap[y+ry][x+rx];
				if (!r)
					continue;
				if ((r&0xFF)!=PT_ACID && (r&0xFF)!=PT_CAUS)
				{
					if ((r&0xFF)==PT_PLEX || (r&0xFF)==PT_NITR || (r&0xFF)==PT_GUNP || (r&0xFF)==PT_RBDM || (r&0xFF)==PT_LRBD)
					{
						sim->part_change_type(i,x,y,PT_FIRE);
						sim->part_change_type(r>>8,x+rx,y+ry,PT_FIRE);
						parts[i].life = 4;
						parts[r>>8].life = 4;
					}
					else if ((r&0xFF)==PT_WTRV)
					{
						if(!(rand()%250))
						{
							sim->part_change_type(i, x, y, PT_CAUS);
							parts[i].life = (rand()%50)+25;
							sim->kill_part(r>>8);
						}
					}
					else if (((r&0xFF)!=PT_CLNE && (r&0xFF)!=PT_PCLN && sim->ptypes[r&0xFF].hardness>(rand()%1000))&&parts[i].life>=50)
					{
						if (sim->parts_avg(i, r>>8,PT_GLAS)!= PT_GLAS)//GLAS protects stuff from acid
						{
							float newtemp = ((60.0f-(float)sim->ptypes[r&0xFF].hardness))*7.0f;
							if(newtemp < 0){
								newtemp = 0;
							}
							parts[i].temp += newtemp;
							parts[i].life--;
							sim->kill_part(r>>8);
						}
					}
					else if (parts[i].life<=50)
					{
						sim->kill_part(i);
						return 1;
					}
				}
			}
	for ( trade = 0; trade<2; trade ++)
	{
		rx = rand()%5-2;
		ry = rand()%5-2;
		if (x+rx>=0 && y+ry>0 && x+rx<XRES && y+ry<YRES && (rx || ry))
		{
			r = pmap[y+ry][x+rx];
			if ((r>>8)>=NPART || !r)
				continue;
			if ((r&0xFF)==PT_ACID&&(parts[i].life>parts[r>>8].life)&&parts[i].life>0)//diffusion
			{
				int temp = parts[i].life - parts[r>>8].life;
				if (temp ==1)
				{
					parts[r>>8].life ++;
					parts[i].life --;
				}
				else if (temp>0)
				{
					parts[r>>8].life += temp/2;
					parts[i].life -= temp/2;
				}
			}
		}
	}
	return 0;
}