#!/usr/bin/env python3

# https://adventofcode.com/2024/day/2

def get_lines(filename: str) -> list:
    with open(filename, "r") as file:
        return [line.strip() for line in file.readlines()]


def part_one(lines: list) -> int:
    safe_reports = 0
    for line in lines:
        reports = [int(x) for x in line.split(" ")]
        # print(reports)
        increasing = True
        decreasing = True
        safe = True
        for i in range(len(reports) - 1):
            if reports[i] >= reports[i + 1]:
                increasing = False
            if reports[i] <= reports[i + 1]:
                decreasing = False
            distance = abs(reports[i] - reports[i + 1])
            if distance < 1 or distance > 3:
                safe = False
            pass
        if safe and (increasing or decreasing):
            safe_reports += 1
    return safe_reports


def main():
    # lines = get_lines("sample-input.txt")
    lines = get_lines("input.txt")

    safe_reports = part_one(lines)
    print(f"Part 1: There are {safe_reports} safe reports.")


if __name__ == '__main__':
    main()