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use super::sealed::IsSession;
use super::*;

/// Label a loop point, which can be reiterated with [`Continue`].
#[repr(transparent)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct Loop<P>(pub P);

impl<P: IsSession> IsSession for Loop<P> {}

impl<P> HasDual for Loop<P>
where
    P: HasDual,
{
    type DualSession = Loop<<P as HasDual>::DualSession>;
}

impl<N: Unary, P: Scoped<S<N>>> Scoped<N> for Loop<P> {}

impl<P> Actionable for Loop<P>
where
    P: Subst<Loop<P>, Z>,
    P::Substituted: Actionable,
{
    type NextAction = <P::Substituted as Actionable>::NextAction;
}

impl<P, Q, N: Unary> Subst<Q, N> for Loop<P>
where
    P: Subst<Q, S<N>>,
{
    type Substituted = Loop<<P as Subst<Q, S<N>>>::Substituted>;
}

impl<P, Q, N: Unary> Then<Q, N> for Loop<P>
where
    P: Then<Q, S<N>>,
{
    type Combined = Loop<<P as Then<Q, S<N>>>::Combined>;
}

impl<N: Unary, Level: Unary, P> Lift<N, Level> for Loop<P>
where
    P: Lift<N, S<Level>>,
{
    type Lifted = Loop<<P as Lift<N, S<Level>>>::Lifted>;
}