treaty -


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use std::{marker::PhantomData, ops::ControlFlow, pin::Pin, thread::yield_now, time::Duration};

use treaty::{
    any::{any_trait, static_wrapper::OwnedStatic, AnyTrait, IndirectLtAny, LtTypeId},
    builders::core::option::IgnoreMissing,
    effect::{BlockOn, Blocking, Effect, Future, Spin},
    protocol::visitor::value::Value,
    protocol::Visitor,
    transform, Build, Builder, Walk, Walker, WalkerTypes,
};

#[test]
fn demo() {
    let hook = Hook::<_, Blocking> {
        inner: true.into_walker::<Blocking>(),
        _marker: PhantomData,
    };
    // let x = build_with::<<bool as Build<_>>::Builder, _>(hook).unwrap();
    // dbg!(x);
    // let x = Spin::block_on(transform::<<Option<bool> as Build>::Builder<_>, _, Blocking>(IgnoreMissing::No, hook));
    let x = Spin::block_on(transform::<<bool as Build>::Builder<_>, _, Blocking>(
        (),
        hook,
    ));
    dbg!(x);
    todo!();
}

#[no_mangle]
fn invert(x: bool) -> bool {
    let hook = Hook::<_, Blocking> {
        inner: x.into_walker::<Blocking>(),
        _marker: PhantomData,
    };
    Spin::block_on(transform::<<bool as Build>::Builder<_>, _, Blocking>(
        (),
        hook,
    ))
    .0
    .unwrap()
}

struct Hook<T, E> {
    inner: T,
    _marker: PhantomData<fn() -> E>,
}

struct VisitorHook<'a, 'ctx: 'a, E> {
    inner: Visitor<'a, 'ctx>,
    _marker: PhantomData<fn() -> E>,
}

impl<'ctx, T: Walker<'ctx, Effect = E>, E: Effect<'ctx>> WalkerTypes<'ctx> for Hook<T, E> {
    type Error = T::Error;

    type Output = T::Output;
}

impl<'ctx, T: Walker<'ctx, Effect = E>, E: Effect<'ctx>> Walker<'ctx> for Hook<T, E> {
    type Effect = E;

    fn walk<'a>(
        self,
        visitor: Visitor<'a, 'ctx>,
    ) -> Future<'a, 'ctx, Result<Self::Output, Self::Error>, E>
    where
        Self: 'a,
    {
        E::wrap(async {
            let mut visitor = VisitorHook::<E> {
                inner: visitor,
                _marker: PhantomData,
            };

            let flow = self.inner.walk(&mut visitor);

            flow.await
        })
    }
}

impl<'b, 'ctx: 'b, E: Effect<'ctx>> AnyTrait<'ctx> for VisitorHook<'b, 'ctx, E> {
    fn upcast_to_id<'a>(
        &'a self,
        id: treaty::any::LtTypeId<'ctx>,
    ) -> Option<treaty::any::IndirectLtAny<'a, 'ctx, treaty::any::Ref>>
    where
        'ctx: 'a,
    {
        match id {
            id => self.inner.upcast_to_id(id),
        }
    }

    #[inline]
    fn upcast_to_id_mut<'a>(
        &'a mut self,
        id: treaty::any::LtTypeId<'ctx>,
    ) -> Option<treaty::any::IndirectLtAny<'a, 'ctx, treaty::any::Mut>>
    where
        'ctx: 'a,
    {
        match id {
            id if id == LtTypeId::of::<dyn Value<'a, 'ctx, OwnedStatic<bool>, E> + 'a>() => {
                // println!("hook: {:?}", id);
                if self.inner.upcast_to_id_mut(id).is_some() {
                    Some(IndirectLtAny::<'a, 'ctx, _>::new::<
                        dyn Value<'a, 'ctx, OwnedStatic<bool>, E> + 'a,
                    >(self as _))
                } else {
                    None
                }
            }
            id => {
                // println!("fallback: {:?}", id);
                self.inner.upcast_to_id_mut(id)
            }
        }
    }
}

impl<'a, 'b, 'ctx: 'a + 'b, E: Effect<'ctx>> Value<'a, 'ctx, OwnedStatic<bool>, E>
    for VisitorHook<'b, 'ctx, E>
{
    #[inline]
    fn visit(
        &'a mut self,
        OwnedStatic(value): OwnedStatic<bool>,
    ) -> Future<'a, 'ctx, ControlFlow<(), ()>, E> {
        let visitor = self
            .inner
            .upcast_mut::<dyn Value<'a, 'ctx, OwnedStatic<bool>, E> + 'a>()
            .unwrap();

        // println!("Hooked bool: {}", value);
        visitor.visit(OwnedStatic(!value))
    }
}