use std::{cmp::Ordering, io};

fn main() {
    println!("猜数游戏");
    let secret_number: u32 = rand::random_range(1..=100);
    // println!("The secret number is: {}", secret_number);
    
    let mut count = 0;
    loop {
        let mut guess = String::new();

        println!("请输入你的猜测:");
        io::stdin().read_line(&mut guess).expect("读取输入错误!");
        let guess_number: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                println!("请输入数字!");
                continue;
            }
        };

        count += 1;

        match guess_number.cmp(&secret_number) {
            Ordering::Less => println!("小了!"),
            Ordering::Greater => println!("大了!"),
            Ordering::Equal => {
                println!("猜对了!");
                println!("你一共猜了{}次", count);
                break;
            }
        }
    }
}

/// 猜数字游戏 — 可指定数字范围，返回猜测次数
fn guess_game(low: u32, high: u32) -> u32 {
    let secret = rand::random_range(low..=high);
    let mut guess = String::new();
    let mut count = 0;

    loop {
        guess.clear();
        println!("请输入你的猜测 ({low}~{high}):");
        io::stdin().read_line(&mut guess).expect("读取输入错误!");

        let guess_num: u32 = match guess.trim().parse() {
            Ok(n) if n < low || n > high => {
                println!("数字不在范围内，请重新输入!");
                continue;
            }
            Ok(n) => n,
            Err(_) => {
                println!("请输入有效的数字!");
                continue;
            }
        };

        count += 1;

        match guess_num.cmp(&secret) {
            Ordering::Less => println!("小了!"),
            Ordering::Greater => println!("大了!"),
            Ordering::Equal => {
                println!("猜对了! 答案是 {secret}，你一共猜了 {count} 次");
                return count;
            }
        }
    }
}