treaty -


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use mockall::mock;
use treaty::{
    any::{any_trait, TypeName},
    effect::{Effect, Future},
    protocol::{
        walker::hint::{Hint, HintMeta, HintProto, Known},
        Visitor,
    },
    Flow,
};

pub type KnownFactory<P> =
    for<'a, 'ctx> fn(&'ctx (), &'a <P as HintMeta>::Hint) -> Result<Known<'a, 'ctx, P>, ()>;

mock! {
    pub HintVisitor<P: HintMeta, E> {
        pub fn hint<'a, 'ctx>(&'a mut self, visitor: Visitor<'a, 'ctx>, hint: <P as HintMeta>::Hint) -> Flow;

        pub fn known(&self) -> KnownFactory<P>;
    }
}

any_trait! {
    impl['ctx, P, E] MockHintVisitor<P, E> = [
        HintProto<P, E>
    ] where
        P: HintMeta,
        E: Effect,
}

impl<'ctx, P: HintMeta, E: Effect> Hint<'ctx, P, E> for MockHintVisitor<P, E> {
    fn hint<'a>(
        &'a mut self,
        visitor: Visitor<'a, 'ctx>,
        hint: <P as HintMeta>::Hint,
    ) -> Future<'a, Flow, E> {
        E::ready(self.hint(visitor, hint))
    }

    fn known<'a>(
        &'a mut self,
        hint: &'a <P as HintMeta>::Hint,
    ) -> Future<'a, Result<Known<'a, 'ctx, P>, ()>, E> {
        E::ready(Self::known(self)(&(), hint))
    }
}