#advent of code 2018 
#day 10

#part 1 & part 2

class light:
	def __init__(self, x,y,vx,vy):
		self.Pos = [x,y];
		self.Vel = [vx,vy];
	def CalcNextPos(self, t):
		return [self.Pos[0]+t*self.Vel[0],self.Pos[1]+t*self.Vel[1]];
	def __str__(self):
		return f'<{self.Pos[0]},{self.Pos[1]}>';
		
def CalcArea(x1,x2,y1,y2):
	return abs(x1-x2)*abs(y1-y2);

f = open("input.txt",'r');
Testing = False;
#Testing = True; 
if Testing:
	f.close();
	f = open("testinput.txt",'r');

lights = [];

for tl in f:
	tl = tl.replace("position=<", "");
	tl = tl.replace("velocity=<", "");
	tl = tl.replace(">", "");
	tl = tl.replace(",", "");
	tl=tl.split();
	lights.append( light(int(tl[0]),int(tl[1]),int(tl[2]),int(tl[3])) );
f.close();

Xmin = min(lights, key = lambda x: x.Pos[0]).Pos[0];
Xmax = max(lights, key = lambda x: x.Pos[0]).Pos[0];
Ymin = min(lights, key = lambda y: y.Pos[1]).Pos[1];
Ymax = max(lights, key = lambda y: y.Pos[1]).Pos[1];
#print(Xmin,Xmax,Ymin,Ymax);

PrevArea = CalcArea(Xmin,Xmax,Ymin,Ymax);
ElapsedTime = 0;

while True:
	#print(ElapsedTime);
	ElapsedTime += 1;
	Xmin = min(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[0]).CalcNextPos(ElapsedTime)[0];
	Xmax = max(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[0]).CalcNextPos(ElapsedTime)[0];
	Ymin = min(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[1]).CalcNextPos(ElapsedTime)[1];
	Ymax = max(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[1]).CalcNextPos(ElapsedTime)[1];
	
	CurrArea = CalcArea(Xmin,Xmax,Ymin,Ymax);
	
	if (CurrArea > PrevArea):
		MessageTime = ElapsedTime-1;
		break;
		
	PrevArea = CurrArea;

pointlist = [];

for l in lights:
	xy = l.CalcNextPos(MessageTime);
	pointlist.append((xy[0],xy[1]));

Xmin = min(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[0]).CalcNextPos(ElapsedTime)[0];
Xmax = max(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[0]).CalcNextPos(ElapsedTime)[0];
Ymin = min(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[1]).CalcNextPos(ElapsedTime)[1];
Ymax = max(lights, key = lambda L: L.CalcNextPos(ElapsedTime)[1]).CalcNextPos(ElapsedTime)[1];


print("###########");
print("part1:");

for Y in range(Ymin,Ymax+1):
	for X in range(Xmin,Xmax+1):
		sign = " ";
		if ((X,Y) in pointlist):
			sign = "#";
		print(sign, end="");
	#print(end="");
	print();

part2 = MessageTime;

print("###########");
print("part2 ,", part2);