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use crate::Signal;
use Signal::*;
pub fn and<T>(a: T, b: T) -> Signal
where
    T: Into<Signal>,
{
    match (a.into(), b.into()) {
        (On, On) => On,
        _ => Off,
    }
}

pub fn nand<T>(a: T, b: T) -> Signal
where
    T: Into<Signal>,
{
    not(and(a, b))
}

pub fn nor<T>(a: T, b: T) -> Signal
where
    T: Into<Signal>,
{
    not(or(a, b))
}

pub fn xor<T>(a: T, b: T) -> Signal
where
    T: Into<Signal>,
{
    match (a.into(), b.into()) {
        (On, Off) | (Off, On) => On,
        _ => Off,
    }
}

pub fn or<T>(a: T, b: T) -> Signal
where
    T: Into<Signal>,
{
    match (a.into(), b.into()) {
        (Off, Off) => Off,
        _ => On,
    }
}

pub fn not<T>(a: T) -> Signal
where
    T: Into<Signal>,
{
    match a.into() {
        Off => On,
        On => Off,
    }
}

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

    #[test]
    fn t_and() {
        assert_eq!(and(Off, Off), Off);
        assert_eq!(and(On, Off), Off);
        assert_eq!(and(Off, On), Off);
        assert_eq!(and(On, On), On);
    }

    #[test]
    fn t_or() {
        assert_eq!(or(Off, Off), Off);
        assert_eq!(or(On, Off), On);
        assert_eq!(or(Off, On), On);
        assert_eq!(or(On, On), On);
    }

    #[test]
    fn t_nand() {
        assert_eq!(nand(Off, Off), On);
        assert_eq!(nand(On, Off), On);
        assert_eq!(nand(Off, On), On);
        assert_eq!(nand(On, On), Off);
    }

    #[test]
    fn t_nor() {
        assert_eq!(nor(Off, Off), On);
        assert_eq!(nor(On, Off), Off);
        assert_eq!(nor(Off, On), Off);
        assert_eq!(nor(On, On), Off);
    }

    #[test]
    fn t_xor() {
        assert_eq!(xor(Off, Off), Off);
        assert_eq!(xor(On, Off), On);
        assert_eq!(xor(Off, On), On);
        assert_eq!(xor(On, On), Off);
    }
}