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_03a/input");
    let mut result = 0;
    let mut i = 0;
    let mut hashmap = HashMap::new();

    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 i == 0 {
                hashmap = HashMap::new();
            }
            if let Ok(ip) = line {
                println!("{:?}", hashmap);
                for c in ip.chars() {
                    if i == 0 {
                        hashmap.insert(c, 100);
                    }
                    else if i == 1 {
                        *hashmap.entry(c).or_insert(2) += 1;
                    }
                    else if i == 2 {
                        match hashmap.get(&c) {
                            Some(&number) => {
                                if number > 100 {
                                    println!("{}", c);
                                    if c >= 'A' && c <= 'Z' {
                                        result += 27 + c as u32 - 'A' as u32;
                                    }
                                    else {
                                        result += 1 + c as u32 - 'a' as u32;
                                    }
                                    break;
                                }
                            }
                            _ => (),
                        }
                    }
                }
            }
            i = (i + 1) % 3;
        }
    }

    println!("{}", result);
}

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())
}