from functools import reduce
from typing import List, Generator

from aoc import BaseAssignment


class Assignment(BaseAssignment):
    def read_input(self, example = False) -> List:
        return list(super().read_input(example))

    def slope(self, input: List, dx: int, dy: int) -> Generator:
        for y, row in enumerate(input[::dy]):
            x = (y * dx) % len(row)
            yield (x, y)

    def get_trees_for_slope(self, input: List, dx: int, dy: int):
        trees = 0

        for x, y in self.slope(input, dx, dy):
            if x == 0 and y == 0:
                continue

            if (input[y * dy][x]) == '#':
                trees += 1

        return trees



class AssignmentOne(Assignment):
    def run(self, input: List):
        return self.get_trees_for_slope(input, 3, 1)

class AssignmentTwo(Assignment):
    def run(self, input: List):
        return reduce(lambda accumulator, value: accumulator * value, [
            self.get_trees_for_slope(input, 1, 1),
            self.get_trees_for_slope(input, 3, 1),
            self.get_trees_for_slope(input, 5, 1),
            self.get_trees_for_slope(input, 7, 1),
            self.get_trees_for_slope(input, 1, 2),
        ])