use std::fs;
use std::io;
use std::time::Instant;

// Right = up/increase
// Left = down/decrease
fn main() -> io::Result<()> 
{
    let start = Instant::now();
    let file_contents: String = fs::read_to_string("large.txt")?;
    let lines: Vec<&str> = file_contents
        .split("\n")
        .collect();

    let mut position: i32 = 50;
    let mut total1: i32 = 0;
    let mut total2: i32 = 0;

    println!("The dial starts by pointing at {position}");

    for index in 0..&lines.len()-1
    {
        let movement = &lines[index][0..1];
        let mut number: i32 = lines[index][1..lines[index].len()].parse().unwrap();

        if movement == "L" {
            number = -number
        };
        if number < 0 {
            total2 += (100 - position - number) / 100 - (position == 0) as i32
        }
        else {
            total2 += (number+position) / 100
        };
        position = (position + number).rem_euclid(100);
        if position == 0 {
            total1 += 1;
        }
    }

    let end = start.elapsed();
    println!("part1: {total1}");
    println!("part2: {total2}");
    println!("Took: {:.2?}",end);


    Ok(())
}