#![allow(dead_code, unused_imports)]
use std::fs::File;
use std::io::{self, BufRead};
use std::path::Path;
fn main() {
    let mut h = 0;
    let mut v = 0;
    let mut aim = 0;
    if let Ok(lines) = read_lines("directions.txt") {
        for line in lines {
            if let Ok(val) = line {
                println!("{}", val);
                //shadow assignment
                let val: Vec<&str> = val.split(' ').collect();
                let cmd = val[0];
                let n = val[1].parse::<u32>().unwrap();
                match cmd {
                    "forward" => {
                        h += n;
                        v += n * aim
                    }
                    "down" => aim += n,
                    "up" => aim -= n,
                    _ => println!("not a command"),
                }
            }
        }
    }
    println!("h: {}, v: {}, final position: {}", h, v, h * v);
}

fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
where
    P: AsRef<Path>,
{
    let file = File::open(filename)?;
    Ok(io::BufReader::new(file).lines())
}