use std::fmt::Display;

use serde::{Deserialize, Serialize};

#[derive(Clone, Copy, Serialize, Deserialize)]
pub enum CardSuit {
    Spades,
    Clubs,
    Hearts,
    Diamonds,
}

impl CardSuit {
    pub fn is_red(&self) -> bool {
        matches!(self, CardSuit::Hearts | CardSuit::Diamonds)
    }

    pub fn is_black(&self) -> bool {
        !self.is_red()
    }
}

impl Display for CardSuit {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let icon = match self {
            CardSuit::Clubs => "♣️",
            CardSuit::Diamonds => "♦️",
            CardSuit::Hearts => "♥️",
            CardSuit::Spades => "♠️",
        };

        f.write_str(icon)?;

        Ok(())
    }
}

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

    #[test]
    fn color() {
        assert!(CardSuit::Hearts.is_red());
        assert!(CardSuit::Diamonds.is_red());
        assert!(CardSuit::Clubs.is_black());
        assert!(CardSuit::Spades.is_black());
    }
}