use std::io::{self, Write};
use std::process::exit;

use day30::max_value;

fn main() {
    let mut buffer = String::new();

    print!("Insert the starting number: ");
    io::stdout().flush().expect("Failed to flush stdout");

    io::stdin()
        .read_line(&mut buffer)
        .expect("Failed to read line");

    let n: isize = match buffer.trim().parse() {
        Ok(n) => n,
        Err(_) => {
            eprintln!("Invalid number");
            exit(1);
        }
    };

    buffer.clear();

    print!("Insert the digit to add to the number: ");
    io::stdout().flush().expect("Failed to flush stdout");

    io::stdin()
        .read_line(&mut buffer)
        .expect("Failed to read line");

    let digit: char = match buffer.trim().parse() {
        Ok(digit) => digit,
        Err(_) => {
            eprintln!("Invalid digit");
            exit(1);
        }
    };

    let result = max_value(n, digit);
    match result {
        Ok(result) => println!("The maximum value possible is: {}", result),
        Err(e) => eprintln!("Error: {}", e),
    }
}