use std::fs::File;
use std::io::{self, BufRead};
use std::path::Path;

pub fn part_one() {
    if let Ok(lines) = read_lines("./input.txt") {
        let mut margin = 1;

        let mut race_results: Vec<Vec<u32>> = Vec::new();

        for line in lines {
            race_results.push(process_line(&line.unwrap()));
        }

        for i in 0..race_results[0].len() {
            margin *= process_race_result(race_results[0][i], race_results[1][i]);
        }

        println!("{:?}", margin);
    }
}

fn process_line(s: &str) -> Vec<u32> {
    let nums_str = s.split(':').collect::<Vec<&str>>()[1]
        .split_whitespace()
        .collect::<Vec<&str>>();
    let nums: Vec<u32> = nums_str.iter().map(|s| s.parse::<u32>().unwrap()).collect();

    return nums;
}

fn process_race_result(time: u32, distance: u32) -> u32 {
    let mut win_count = 0;

    for i in 0..time {
        if i * (time - i) > distance {
            win_count += 1;
        }
    }

    return win_count;
}

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())
}