#[path = "../lib.rs"] mod lib;

fn parse_abc(c: Option<char>) -> u64 {
    return match c {
        Some('A') => 0,
        Some('B') => 1,
        Some('C') => 2,
        _ => unreachable!(),
    };
}

fn parse_xyz(c: Option<char>) -> u64 {
    return match c {
        Some('X') => 0,
        Some('Y') => 1,
        Some('Z') => 2,
        _ => unreachable!(),
    };
}

fn part1() -> u64 {
    let mut score = 0;

    for line in lib::iter_input() {
        let opponent = parse_abc(line.chars().nth(0));
        let own = parse_xyz(line.chars().nth(2));
        let match_score = (4 + own - opponent) % 3;
        score += (own + 1) + (match_score * 3);
    }

    return score;
}

fn part2() -> u64 {
    let mut score = 0;

    for line in lib::iter_input() {
        let opponent = parse_abc(line.chars().nth(0));
        let match_score = parse_xyz(line.chars().nth(2));
        let own = (2 + match_score + opponent) % 3;
        score += (own + 1) + (match_score * 3);
    }

    return score;
}

fn main() {
    println!("part1: {}", part1());
    println!("part2: {}", part2());
}