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

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

    let secret_number = rand::rng().random_range(1..=100);

    // println!("The secret number is: {secret_number}");

    let mut p_next_correct: f32;
    let mut min_window: u32 = 0;
    let mut max_window: u32 = 100;

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

        let mut guess = String::new();

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

        // Turn the guess into a u32 type, excpecting errors.
        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                if guess == "exit" {
                    break;
                } else {
                    println!("DO IT!");
                    continue;
                }
            }
        };

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

        match guess.cmp(&secret_number) {
            Ordering::Less => {
                if guess > min_window {
                    min_window = guess;
                }
                println!("Too small!");
            }
            Ordering::Greater => {
                if guess < max_window {
                    max_window = guess;
                }
                println!("Too large!");
            }
            Ordering::Equal => {
                println!("You win!");
                break;
            }
        }

        println!("Max: {max_window}, Min: {min_window}");
        p_next_correct = 1.0 / ((max_window - min_window - 1) as f32);
        println!("Probability of next guess: {}", (p_next_correct * 100.0));
        println!("\n");
    }
}