/* guessing_game main.rs | Thu, Jul 20, 2017 | Roman S. Collins

    Guessing game from the Rust book with additional
    functionality to learn some Rust following but
    adapting code from the book.

    I added:
    - Code to exit with "quit" or "exit"
*/
extern crate rand;

use rand::Rng;
use std::io;
use std::cmp::Ordering;

fn main() {
    println!("Guess the number!");

    let secret_number = rand::thread_rng().gen_range(1, 101);

    loop {
        println!("Please input your guess:");

        let mut guess = String::new();

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

        // Catch "exit" or "quit" before
        // trying to parse guess into
        // a u32
        // Stupid version
        // let ifquit = &guess;
        // match ifquit.trim() {
        //     "quit" | "exit" => {
        //         println!("Thanks for playing, goodbye!");
        //         break;
        //     }
        //     _ => {}
        // }

        // Better even lazier version
        let ifquit = &guess.trim().to_uppercase();
        if ifquit.contains("QUIT") || ifquit.contains("EXIT") {
            println!("Thanks for playing, goodbye!");
            break;
        }

        // Original from Rust Book
        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => continue,
        };

        // Kinda ew...
        // Add case for "quit" or "exit" with arm
        // let guess: u32 = match guess.trim().parse() {
        //     Ok(num) => num,
        //     Err(_) if guess.contains("exit") ||
        //         guess.contains("quit") => {
        //             println!("Thanks for playing, goodbye!");
        //             break;
        //     }
        //     Err(_) => continue,
        // };

        println!("You guessed {}", guess);

        // Needs guess to become a u32
        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too small!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("You win!");
                break;
            }
        }
    }
}