# --- Day 1: Not Quite Lisp ---

# Santa was hoping for a white Christmas, but his weather machine's "snow"
# function is powered by stars, and he's fresh out! To save Christmas, he needs
# you to collect fifty stars by December 25th.

# Collect stars by helping Santa solve puzzles. Two puzzles will be made
# available on each day in the Advent calendar; the second puzzle is unlocked
# when you complete the first. Each puzzle grants one star. Good luck!

# Here's an easy puzzle to warm you up.

# Santa is trying to deliver presents in a large apartment building, but he
# can't find the right floor - the directions he got are a little confusing.
# He starts on the ground floor (floor 0) and then follows the instructions
# one character at a time.

# An opening parenthesis, (, means he should go up one floor, and a closing
# parenthesis, ), means he should go down one floor.

# The apartment building is very tall, and the basement is very deep; he will
# never find the top or bottom floors.

# For example:

#     (()) and ()() both result in floor 0.
#     ((( and (()(()( both result in floor 3.
#     ))((((( also results in floor 3.
#     ()) and ))( both result in floor -1 (the first basement level).
#     ))) and )())()) both result in floor -3.

# To what floor do the instructions take Santa?

with open("files/P1.txt") as f:
    directions = f.read().strip()


def part_1() -> None:
    up = directions.count("(")
    down = directions.count(")")
    print(f"The floor is {up - down}")


# --- Part Two ---

# Now, given the same instructions, find the position of the first character
# that causes him to enter the basement (floor -1). The first character in the
# instructions has position 1, the second character has position 2, and so on.

# For example:

#     ) causes him to enter the basement at character position 1.
#     ()()) causes him to enter the basement at character position 5.

# What is the position of the character that causes Santa to first enter the
# basement?


def part_2() -> None:
    floor = 0
    for idx, char in enumerate(directions, start=1):
        if char == "(":
            floor += 1
        elif char == ")":
            floor -= 1
        if floor == -1:
            print(f"The position is {idx}")
            return
    print("Basement was never reached!")


if __name__ == "__main__":
    part_1()
    part_2()