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use rand::{Rng, thread_rng};

/// 生成uuid
pub fn uuid() -> String {
    return uuid::Uuid::new_v4().to_string();
}

/// 生成验证码
pub fn verification_code(len: usize) -> String {
    let text = "0123456789";
    let mut code = "".to_string();
    for _ in 0..len {
        let index = random_number(0, text.len() - 1);
        let t = &text[(index as usize)..=index as usize];
        code = format!("{}{}", code, t);
    }
    return code.to_string();
}

/// 从一组字母+数字的字符，创建随机密码
pub fn random_password(len: usize) -> String {
    let text = "abcdefghijklmnopqrstuvwxyz0123456789";
    let mut code = "".to_string();
    for _ in 0..len {
        let index = random_number(0, text.len() - 1);
        let t = &text[(index as usize)..=index as usize];
        code = format!("{}{}", code, t);
    }
    return code.to_string();
}

/// 生成指定范围内的随机数
pub fn random_number(begin: usize, finish: usize) -> usize {
    let mut rng = thread_rng();
    return rng.gen_range(begin..=finish) as usize;
}

pub fn random_number_f64(begin: f64, finish: f64) -> f64 {
    let mut rng = thread_rng();
    return rng.gen_range(begin..=finish) as f64;
}