treaty -


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use effectful::{
    environment::{Environment, NativeForm, DynBind},
    bound::{Bool, IsSend, IsSync, Dynamic},
    effective::Effective,
    forward_send_sync,
};
use mockall::mock;
use treaty::{
    any::{any_trait, OwnedStatic, TypeName},
    protocol::{
        visitor::{visit_value, Value, ValueProto, VisitResult},
        AsVisitor, DynVisitor,
    },
    Flow,
};

use crate::common::Blocking;

mock! {
    pub ValueVisitor<T: TypeName::MemberType<E>, E: Environment>
    where
        for<'a, 'ctx> TypeName::T<'a, 'ctx, T, E>: Sized
    {
        pub fn visit<'a, 'ctx>(&'a mut self, value: &TypeName::T<'a, 'ctx, T, E>) -> VisitResult<()>;
    }
}

forward_send_sync!({} {} {T: (TypeName::MemberType<E>), E: (Environment)} MockValueVisitor<T, E> where {
    for<'a, 'ctx> TypeName::T<'a, 'ctx, T, E>: Sized
});

any_trait! {
    impl['ctx, T][E] MockValueVisitor<T, E> = [
        ValueProto<T, E>
    ] where
        T: TypeName::MemberType<E>,
        for<'a, 'b> TypeName::T<'a, 'b, T, E>: Sized,
        for<'a> Dynamic<TypeName::T<'a, 'ctx, T, E>>: DynBind<E>,
        E: Environment,
}

impl<'ctx, T: TypeName::MemberType<E>, E: Environment> Value<'ctx, T, E> for MockValueVisitor<T, E>
where
    for<'a, 'lt> TypeName::T<'a, 'lt, T, E>: Sized,
    for<'a> Dynamic<TypeName::T<'a, 'ctx, T, E>>: DynBind<E>,
{
    fn visit<'a>(
        &'a mut self,
        value: TypeName::T<'a, 'ctx, T, E>,
    ) -> NativeForm<'a, VisitResult<Dynamic<TypeName::T<'a, 'ctx, T, E>>>, E>
    where
        'ctx: 'a,
    {
        E::value(match self.visit(&value) {
            VisitResult::Skipped(_) => VisitResult::Skipped(Dynamic(value)),
            VisitResult::Control(flow) => VisitResult::Control(flow),
        }).cast()
    }
}

pub trait ValueVisitorExt<'ctx> {
    fn visit_value_and_done<'a, T>(&'a mut self, value: T)
    where
        T: TypeName::LowerType<'a, 'ctx, Blocking>,
        TypeName::HigherRanked<'a, 'ctx, T, Blocking>: TypeName::MemberType<Blocking>,
        'ctx: 'a;

    fn visit_value_and_skipped<'a, T>(&'a mut self, value: T)
    where
        T: TypeName::LowerType<'a, 'ctx, Blocking>,
        TypeName::HigherRanked<'a, 'ctx, T, Blocking>: TypeName::MemberType<Blocking>,
        'ctx: 'a;
}

impl<'ctx, U> ValueVisitorExt<'ctx> for U
where
    U: AsVisitor<'ctx, Blocking>,
{
    #[track_caller]
    fn visit_value_and_done<'a, T>(&'a mut self, value: T)
    where
        T: TypeName::LowerType<'a, 'ctx, Blocking>,
        TypeName::HigherRanked<'a, 'ctx, T, Blocking>: TypeName::MemberType<Blocking>,
        'ctx: 'a,
    {
        let result = visit_value::<_, Blocking>(self.as_visitor(), value).into_value();

        assert_eq!(result, VisitResult::Control(Flow::Done));
    }

    #[track_caller]
    fn visit_value_and_skipped<'a, T>(&'a mut self, value: T)
    where
        T: TypeName::LowerType<'a, 'ctx, Blocking>,
        TypeName::HigherRanked<'a, 'ctx, T, Blocking>: TypeName::MemberType<Blocking>,
        'ctx: 'a,
    {
        let result = visit_value::<_, Blocking>(self.as_visitor(), value).into_value();

        assert_eq!(result.unit_skipped(), VisitResult::Skipped(()));
    }
}