/*
 * 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_SING(UPDATE_FUNC_ARGS) {
	int r, rx, ry, cry, crx, rad, nxi, nxj, nb, j, spawncount;
	int singularity = -parts[i].life;
	float angle, v;

	if (pv[y/CELL][x/CELL]<singularity)
		pv[y/CELL][x/CELL] += 0.1f*(singularity-pv[y/CELL][x/CELL]);
	if (y+CELL<YRES && pv[y/CELL+1][x/CELL]<singularity)
		pv[y/CELL+1][x/CELL] += 0.1f*(singularity-pv[y/CELL+1][x/CELL]);
	if (x+CELL<XRES)
	{
		pv[y/CELL][x/CELL+1] += 0.1f*(singularity-pv[y/CELL][x/CELL+1]);
		if (y+CELL<YRES)
			pv[y/CELL+1][x/CELL+1] += 0.1f*(singularity-pv[y/CELL+1][x/CELL+1]);
	}
	if (y-CELL>=0 && pv[y/CELL-1][x/CELL]<singularity)
		pv[y/CELL-1][x/CELL] += 0.1f*(singularity-pv[y/CELL-1][x/CELL]);
	if (x-CELL>=0)
	{
		pv[y/CELL][x/CELL-1] += 0.1f*(singularity-pv[y/CELL][x/CELL-1]);
		if (y-CELL>=0)
			pv[y/CELL-1][x/CELL-1] += 0.1f*(singularity-pv[y/CELL-1][x/CELL-1]);
	}
	if (parts[i].life<1) {
		//Pop!
		for (rx=-1; rx<2; rx++) {
			crx = (x/CELL)+rx;
			for (ry=-1; ry<2; ry++) {
				cry = (y/CELL)+ry;
				if (cry >= 0 && crx >= 0 && crx < (XRES/CELL) && cry < (YRES/CELL)) {
					pv[cry][crx] += (float)parts[i].tmp;
				}
			}
		}
		spawncount = (parts[i].tmp>255)?255:parts[i].tmp;
		if (spawncount>=1)
			spawncount = spawncount/8;
		spawncount = spawncount*spawncount*M_PI;
		for (j=0;j<spawncount;j++)
		{
			switch(rand()%3)
			{
				case 0:
					nb = create_part(-3, x, y, PT_PHOT);
					break;
				case 1:
					nb = create_part(-3, x, y, PT_NEUT);
					break;
				case 2:
					nb = create_part(-3, x, y, PT_ELEC);
					break;
			}
			if (nb!=-1) {
				parts[nb].life = (rand()%300);
				parts[nb].temp = MAX_TEMP/2;
				angle = rand()*2.0f*M_PI/RAND_MAX;
				v = (float)(rand())*5.0f/RAND_MAX;
				parts[nb].vx = v*cosf(angle);
				parts[nb].vy = v*sinf(angle);
			}
			else if (pfree==-1)
				break;//if we've run out of particles, stop trying to create them - saves a lot of lag on "sing bomb" saves
		}
		kill_part(i);
		return 1;
	}
	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 && (rx || ry))
			{
				r = pmap[y+ry][x+rx];
				if (!r)
					continue;
				if ((r&0xFF)!=PT_DMND&&33>=rand()/(RAND_MAX/100)+1)
				{
					if ((r&0xFF)==PT_SING && parts[r>>8].life >10)
					{
						if (parts[i].life+parts[r>>8].life > 255)
							continue;
						parts[i].life += parts[r>>8].life;
					}
					else
					{
						if (parts[i].life+3 > 255)
						{
							if (parts[r>>8].type!=PT_SING && 1>rand()%100)
							{
								int np;
								np = create_part(r>>8,x+rx,y+ry,PT_SING);
								parts[np].life = rand()%50+60;
							}
							continue;
						}
						parts[i].life += 3;
						parts[i].tmp++;
					}
					parts[i].temp = restrict_flt(parts[r>>8].temp+parts[i].temp, MIN_TEMP, MAX_TEMP);
					kill_part(r>>8);
				}
			}
	return 0;
}