use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;
use std::path::PathBuf;

use clap::Parser;

#[derive(Parser)]
struct Cli {
    filename: PathBuf,
}

fn main() {
    let cli = Cli::parse();
    let file = File::open(cli.filename).expect("Can't read file");
    let reader = BufReader::new(file);

    let mut score = 0;
    for line in reader.lines() {
        let line = line.unwrap();
        if line.is_empty() {
            continue;
        }

        let mut play = line.trim().split(' ');
        let their_play = play.next().unwrap();
        let play_result = play.next().unwrap();

        // A = Rock (1), B = Paper (2), C = Scissors (3)
        // X = Lose (0), Y = Draw (3), Z = Win (6)
        score += match (their_play, play_result) {
            ("A", "X") => 0 + 3, // they play rock, I lose, I played scissors
            ("B", "X") => 0 + 1, // they play paper, I lose, I played rock
            ("C", "X") => 0 + 2, // they play scissors, I lose, I played paper
            ("A", "Y") => 3 + 1, // they play rock, we draw, I played rock
            ("B", "Y") => 3 + 2, // they play paper, we draw, I played paper
            ("C", "Y") => 3 + 3, // they play scissors, we draw, I played scissors
            ("A", "Z") => 6 + 2, // they play rock, I win, I played paper
            ("B", "Z") => 6 + 3, // they played paper, I win, I played scissors
            ("C", "Z") => 6 + 1, // they played sicssors, I win, I played rock
            _ => 0,
        };
    }
    println!("Your score; {}", score);
}