
'''
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	DAY THREE
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PROBLEM:

Santa is delivering presents to an infinite two-dimensional grid of houses.

He begins by delivering a present to the house at his starting location, and then an elf at the 
North Pole calls him via radio and tells him where to move next. Moves are always exactly one 
house to the north (^), south (v), east (>), or west (<). After each move, he delivers another 
present to the house at his new location.

However, the elf back at the north pole has had a little too much eggnog, and so his directions 
are a little off, and Santa ends up visiting some houses more than once. How many houses receive 
at least one present?

For example:

    > delivers presents to 2 houses: one at the starting location, and one to the east.
    
    ^>v< delivers presents to 4 houses in a square, including twice to the house at 
    his starting/ending location.
   
    ^v^v^v^v^v delivers a bunch of presents to some very lucky children at only 2 houses.


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SOLUTION:

'''

currentX = 0
currentY = 0

vistiedPoints = []

def main():

	consumeInstructions(getListOfInstructions())
	print(len(vistiedPoints))

def getListOfInstructions():

	with open('Input/DayThreeInput') as f:
		content = f.read()
	
	return content 
	
def consumeInstructions(instructionList):

	vistiedPoints.append((currentX, currentY))

	for instruction in instructionList :
		consumeInstruction(instruction)

def consumeInstruction(direction):
	global currentX
	global currentY

	if (direction == '>'):
		currentX += 1
	elif (direction == '<'):
		currentX -= 1
	elif (direction == '^'):
		currentY += 1
	elif (direction == 'v'):
		currentY -= 1

	newPoint = (currentX, currentY)

	if newPoint not in vistiedPoints:
		vistiedPoints.append(newPoint)


if __name__ == '__main__':
	main()