treaty -


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use mockall::mock;
use treaty::{
    any::{any_trait, TypeName},
    effect::{Effect, Effective, ErasedEffective},
    protocol::{
        walker::hint::{Hint, HintMeta, HintProto, MetaHint, MetaKnown},
        DynVisitor,
    },
    Flow,
};

pub type KnownFactory<P> =
    for<'a, 'ctx> fn(&'ctx (), &'a MetaHint<'a, 'ctx, P>) -> Result<MetaKnown<'a, 'ctx, P>, ()>;

mock! {
    pub HintWalker<P: HintMeta> {
        pub fn hint<'a, 'b, 'c, 'ctx>(&'a mut self, visitor: DynVisitor<'b, 'ctx>, hint: MetaHint<'c, 'ctx, P>) -> Flow;

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

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

impl<'ctx, P: HintMeta> Hint<'ctx, P> for MockHintWalker<P> {
    fn hint<'this, 'visitor, 'hint, 'e>(
        &'this mut self,
        visitor: DynVisitor<'visitor, 'ctx>,
        hint: MetaHint<'hint, 'ctx, P>,
    ) -> ErasedEffective<'e, Flow, P::Effect>
    where
        'ctx: 'this + 'visitor + 'hint + 'e,
    {
        P::Effect::ready(self.hint(visitor, hint))
    }

    fn known<'a>(
        &'a mut self,
        hint: &'a MetaHint<'a, 'ctx, P>,
    ) -> ErasedEffective<'a, Result<MetaKnown<'a, 'ctx, P>, ()>, P::Effect> {
        P::Effect::ready(Self::known(self)(&(), hint))
    }
}