use std::fs::File;
use std::io::{BufRead, BufReader};

fn main() {
    let reader = BufReader::new(File::open("../input").unwrap());

    let mut result_part_one: i64 = 0;
    let mut result_part_two: i64 = 0;

    for line in reader.lines() {
        let n = line.unwrap().parse::<i64>().unwrap();
        result_part_one += calculate_fuel1(n);
        result_part_two += calculate_fuel2(n);
    }
    println!("Solution for Part One: {}", result_part_one);
    println!("Solution for Part Two: {}", result_part_two);
}

fn calculate_fuel1(mass: i64) -> i64 {
    let fuel = mass / 3 - 2;
    return fuel
}

fn calculate_fuel2(mass: i64) -> i64 {
    let fuel = mass / 3 - 2;
    if fuel < 0 {
        return 0;
    } else {
        return (fuel) + calculate_fuel2(fuel);
    }
}