#advent of code 2020
#day 12
#Im experimenting with different parsing, 
#the [:-1] is for skipping the empty line
#big mistake: giving north a negative value, 
#which meant that my left and right turns where flipped
#changed it after getting the correct value
navigationInstructions = [line for line in open("12.in","r").read().split("\n")][:-1];

directions = dict();
directions[0] = (0,1); #east
directions[1] = (-1,0); #south
directions[2] = (0,-1); #west
directions[3] = (1,0); #north

#part 1
def actions(act,val,face):
	if act == "N":
		return (val,0,face);
	elif act =="S":
		return (-val,0,face);
	elif act == "E":
		return (0,val,face);
	elif act == "W":
		return (0,-val,face);
	elif act == "L":
		turn = val//90;
		tempF = (4+face-turn)%4;
		return (0,0,tempF);
	elif act == "R":
		turn = val//90;
		tempF = (4+face+turn)%4
		return (0,0,tempF);
	elif act == "F":
		mody,modx = directions[face];
		return (mody*val,modx*val,face);

#part 2
def NewActions(act,val,wayY,wayX):
	if act == "N":
		return (0,0,wayY+val,wayX);
	elif act =="S":
		return (0,0,wayY-val,wayX);
	elif act == "E":
		return (0,0,wayY,wayX+val);
	elif act == "W":
		return (0,0,wayY,wayX-val);
	elif act == "L":
		turn = val//90;
		tempW = (wayY,wayX);
		for t in range(turn):
			tempW = (tempW[1],-tempW[0]);
		return (0,0,tempW[0],tempW[1]);
	elif act == "R":
		turn = val//90;
		tempW = (wayY,wayX);
		for t in range(turn):
			tempW = (-tempW[1],tempW[0]);
		return (0,0,tempW[0],tempW[1]);
	elif act == "F":
		return (wayY*val,wayX*val,wayY,wayX);
	else:
		return False;
	
#ship coordinates, part 1
X1 = 0; 
Y1 = 0;
D1 = 0; #direction
#ship coordinates, part 2
X2,Y2,D2 = 0,0,0;
WX, WY = 10,1; #waypoint relative coordinates

for instr in navigationInstructions:
	action = instr[0];
	value = int(instr[1:]);
	dy1,dx1,dd1 = actions(action,value,D1); #part 1
	Y1 += dy1;
	X1 += dx1;
	D1 = dd1;
	dy2,dx2,dwy,dwx = NewActions(action,value,WY, WX); #part 2
	Y2 += dy2;
	X2 += dx2;
	WY = dwy;
	WX = dwx;

if X1 < 0: X1 = -X1;
if Y1 < 0: Y1 = -Y1;
p1 = X1 + Y1;
if X2 < 0: X2 = -X2;
if Y2 < 0: Y2 = -Y2;
p2 = X2 + Y2;
print("part 1 =",p1);
print("part 2 =",p2);