trictrac/store/src/dice.rs

use crate::Error;
use rand::distributions::{Distribution, Uniform};
use serde::{Deserialize, Serialize};

/// Represents the two dices
///
/// Trictrac is always played with two dices.
#[derive(Debug, Clone, Copy, Serialize, PartialEq, Deserialize, Default)]
pub struct Dices {
    /// The two dice values
    pub values: (u8, u8),
}
impl Dices {
    /// Roll the dices which generates two random numbers between 1 and 6, replicating a perfect
    /// dice. We use the operating system's random number generator.
    pub fn roll(self) -> Self {
        let between = Uniform::new_inclusive(1, 6);
        let mut rng = rand::thread_rng();

        let v = (between.sample(&mut rng), between.sample(&mut rng));

        Dices {
            values: (v.0, v.1),
        }
    }
}

/// Trait to roll the dices
pub trait Roll {
    /// Roll the dices
    fn roll(&mut self) -> Result<&mut Self, Error>;
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_roll() {
        let dices = Dices::default().roll();
        assert!(dices.values.0 >= 1 && dices.values.0 <= 6);
        assert!(dices.values.1 >= 1 && dices.values.1 <= 6);
    }

}