mod merge_sort;
use crate::merge_sort::merge_sort_inversions;
use std::fs::File;
use std::io;
use std::io::{BufRead, BufReader, Error, ErrorKind};
use std::vec::Vec;

fn read_to_vector(path: &str) -> Result<Vec<i64>, io::Error> {
    let file = File::open(path)?;
    let br = BufReader::new(file);
    let mut v = Vec::new();
    for line in br.lines() {
        let line = line?;
        let n = line
            .trim()
            .parse()
            .map_err(|e| Error::new(ErrorKind::InvalidData, e))?;
        v.push(n);
    }
    Ok(v)
}

fn c1a2() {
    let vec = read_to_vector("data/week_2_assignment_2.txt").unwrap();
    let (_sorted, inversions) = merge_sort_inversions(vec);
    // println!("{:?}", sorted.len());
    println!("course 1 assignment 2: {:?}", inversions);
}

fn main() {
    c1a2();
}