from math import atan2
import os
from typing import Tuple


inputfile = os.path.join(os.path.dirname(__file__), "input/day10_input")


def calc_arc(origin: Tuple[int, int], target: Tuple[int, int]) -> float:
    return atan2(target[0] - origin[0], target[1] - origin[1])


def test_day10a():
    with open(inputfile) as fp:
        lines = [x.rstrip() for x in fp.readlines()]
    asts = [(x, y)
            for x, line in enumerate(lines)
            for y, m in enumerate(line)
            if m == '#']

    max = 0
    for my in asts:
        angles = {calc_arc(my, target) for target in asts}
        max = len(angles) if len(angles) > max else max
    assert max == 303