treaty -


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use crate::{
    effect::{Effect, Future},
    never::Never,
    protocol::{
        visitor::{visit_tag, TagConst, TagError, TagKind, VisitResult},
        Visitor,
    },
    walkers::core::noop::NoopWalker,
    Flow, WalkerTypes, TAG_KEY, TAG_KEY_VALUE, TAG_VALUE,
};

pub struct KeyValueWalker<T, K, V> {
    key_walker: K,
    value_walker: V,
    tag: T,
}

impl<T, K, V> KeyValueWalker<T, K, V> {
    pub fn new(tag: T, key_walker: K, value_walker: V) -> Self {
        Self {
            key_walker,
            value_walker,
            tag,
        }
    }
}

#[derive(Debug)]
#[allow(unused)]
enum KeyValueErrorKind<K, V> {
    Tag(TagError<Never>),
    Key(K),
    Value(V),
}

#[derive(Debug)]
pub struct KeyValueError<K, V>(KeyValueErrorKind<K, V>);

impl<T, K, V> WalkerTypes for KeyValueWalker<T, K, V>
where
    K: WalkerTypes,
    V: WalkerTypes,
{
    type Error = KeyValueError<K::Error, V::Error>;

    type Output = ();
}

impl<'ctx, T, K, V, E> crate::Walker<'ctx, E> for KeyValueWalker<T, K, V>
where
    E: Effect,
    T: TagKind,
    K: crate::Walker<'ctx, E>,
    V: crate::Walker<'ctx, E>,
{
    fn walk<'a>(
        self,
        visitor: Visitor<'a, 'ctx>,
    ) -> Future<'a, Result<Self::Output, Self::Error>, E>
    where
        Self: 'a,
    {
        E::wrap(async move {
            match visit_tag::<T, E, _>(self.tag, visitor, NoopWalker::new()).await {
                Ok(VisitResult::Skipped(_)) => {
                    match visit_tag::<TagConst<{ TAG_KEY_VALUE.to_int() }>, E, _>(
                        TagConst,
                        visitor,
                        NoopWalker::new(),
                    )
                    .await
                    {
                        Ok(VisitResult::Skipped(_) | VisitResult::Control(Flow::Continue)) => {}
                        Ok(VisitResult::Control(_flow)) => return Ok(()),
                        Err(_) => todo!(),
                    }
                }
                Ok(VisitResult::Control(Flow::Continue)) => {}
                Ok(VisitResult::Control(_flow)) => todo!(),
                Err(_) => todo!(),
            }

            match visit_tag::<TagConst<{ TAG_KEY.to_int() }>, E, _>(
                TagConst,
                visitor,
                self.key_walker,
            )
            .await
            {
                Ok(VisitResult::Skipped(_) | VisitResult::Control(Flow::Continue)) => {}
                Ok(VisitResult::Control(_flow)) => return Ok(()),
                Err(_) => todo!(),
            }

            match visit_tag::<TagConst<{ TAG_VALUE.to_int() }>, E, _>(
                TagConst,
                visitor,
                self.value_walker,
            )
            .await
            {
                Ok(VisitResult::Control(Flow::Continue)) => {}
                Ok(VisitResult::Skipped(value_walker)) => {
                    // Fallback to just walking the value.
                    match value_walker.walk(visitor).await {
                        Ok(_) => {}
                        Err(_err) => todo!(),
                    }
                }
                Ok(VisitResult::Control(_flow)) => todo!(),
                Err(_) => todo!(),
            }

            Ok(())
        })
    }
}