treaty -


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use mockall::mock;
use treaty::{
    any::{indirect, AnyTrait, AnyTraitObject, TypeNameId},
    effect::{Effect, Effective, ErasedEffective},
    protocol::DynVisitor,
    Builder, BuilderTypes, Walker, WalkerTypes,
};

mock! {
    pub Walker<Output, Error> {
        pub fn walk<'a, 'ctx>(self, visitor: DynVisitor<'a, 'ctx>) -> Result<Output, Error>;

        pub fn traits(&self, id: TypeNameId) -> &Option<Box<dyn for<'ctx> AnyTrait<'ctx> + Send + Sync>>;
        pub fn traits_mut(&mut self, id: TypeNameId) -> &mut Option<Box<dyn for<'ctx> AnyTrait<'ctx> + Send + Sync>>;
    }
}

impl<Output: Send + Sync, Error: Send + Sync> WalkerTypes for MockWalker<Output, Error> {
    type Error = Error;

    type Output = Output;
}

impl<'ctx, Output: Send + Sync, Error: Send + Sync, E: Effect> Walker<'ctx, E>
    for MockWalker<Output, Error>
{
    fn walk<'a: 'c, 'c>(
        self,
        visitor: DynVisitor<'a, 'ctx>,
    ) -> ErasedEffective<'c, Result<Self::Output, Self::Error>, E>
    where
        Self: 'c,
    {
        E::ready(self.walk(visitor)).into_erased()
    }
}

impl<'ctx, Output, Error> AnyTrait<'ctx> for MockWalker<Output, Error> {
    fn upcast_to_id<'a>(&'a self, id: TypeNameId) -> Option<AnyTraitObject<'a, 'ctx, indirect::Ref>>
    where
        'ctx: 'a,
    {
        self.traits(id).as_ref().and_then(|t| t.upcast_to_id(id))
    }

    fn upcast_to_id_mut<'a>(
        &'a mut self,
        id: TypeNameId,
    ) -> Option<AnyTraitObject<'a, 'ctx, indirect::Mut>>
    where
        'ctx: 'a,
    {
        self.traits_mut(id)
            .as_mut()
            .and_then(|t| t.upcast_to_id_mut(id))
    }
}