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

fn main() {
    let file_path = String::from("../aoc_06a/input");
    let mut index = 14;

    println!("In file {}", file_path);

    if let Ok(lines) = read_lines(file_path) {
        // Consumes the iterator, returns an (Optional) String
        for line in lines {
            if let Ok(ip) = line {
                let mut len = 0;
                while len != 14 {
                    let mut hashmap = HashMap::new();
                    let slice = &ip[(index - 14)..index];
                    for c in slice.chars() {
                        hashmap.insert(c, 0);
                    }
                    len = hashmap.len();
                    index += 1;
                }
            }
        }
    }

    println!("{}", index - 1);
}

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())
}