treaty -


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use effectful::{
    bound::{Bool, IsSend, IsSync},
    effective::Effective,
    environment::{DynBind, Environment, NativeForm},
    forward_send_sync,
};
use mockall::mock;
use treaty::{
    any::{indirect, AnyTrait, AnyTraitObject, TypeNameId},
    protocol::DynVisitor,
    Builder, BuilderTypes, Walker,
};

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

        pub fn traits(&self, id: TypeNameId) -> &Option<Box<dyn for<'ctx> AnyTrait<'ctx, E>>>;

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

forward_send_sync!({Output, Error} {} {E: (Environment)} MockWalker<Output, Error, E>);

impl<'ctx, Output: DynBind<E>, Error: DynBind<E> + core::fmt::Debug, E: Environment> Walker<'ctx, E>
    for MockWalker<Output, Error, E>
{
    type Error = Error;

    type Output = Output;

    fn walk<'a: 'c, 'c>(
        self,
        visitor: DynVisitor<'a, 'ctx, E>,
    ) -> NativeForm<'c, Result<Self::Output, Self::Error>, E>
    where
        Self: 'c,
    {
        E::value(self.walk(visitor)).cast()
    }
}

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

    type Available = () where Self: Sized;
}