treaty -


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

use treaty::{
    any::{any_trait, static_wrapper::OwnedStatic, AnyTrait, IndirectLtAny, LtTypeId},
    build_with,
    effect::{any_t, as_obj, AsObj, AsyncEffect, Effect, EffectAnyTrait, SyncEffect, Yield},
    into_walker,
    protocol::{visitor::Value, Visitor},
    Build, Builder, Walker,
};

#[test]
fn demo() {
    let hook = Hook {
        inner: into_walker(true),
        _marker: PhantomData,
    };
    // let x = build_with::<<bool as Build<_>>::Builder, _>(hook).unwrap();
    // dbg!(x);
    let x = build_with::<<Option<bool> as Build<_>>::Builder, _>(hook).unwrap();
    dbg!(x);
    todo!();
}

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

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

struct VisitorHook<'a, 'ctx: 'a, E: EffectAnyTrait<'ctx>> {
    inner: as_obj::T<'a, 'ctx, E::AnyTrait>,
}

impl<'ctx, T: Walker<'ctx, Effect = AsyncEffect> + Send> Walker<'ctx> for Hook<T, AsyncEffect>
where
    <T as Walker<'ctx>>::Error: Send,
    <T as Walker<'ctx>>::Output: Send,
{
    type Effect = T::Effect;

    type Error = T::Error;

    type Output = T::Output;

    fn walk<'a>(
        self,
        visitor: Visitor<'a, 'ctx, T::Effect>,
    ) -> Yield<'a, 'ctx, Result<Self::Output, Self::Error>, Self::Effect>
    where
        Self: 'a,
        'ctx: 'a,
    {
        Box::pin(async move {
            let mut visitor = VisitorHook::<Self::Effect> { inner: visitor };

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

            flow.await
        })
    }
}

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

    type Error = T::Error;

    type Output = T::Output;

    fn walk<'a>(
        self,
        visitor: Visitor<'a, 'ctx, T::Effect>,
    ) -> Yield<'a, 'ctx, Result<Self::Output, Self::Error>, Self::Effect>
    where
        Self: 'a,
        'ctx: 'a,
    {
        let mut visitor = VisitorHook::<Self::Effect> { inner: visitor };
        let flow = self.inner.walk(&mut visitor);
        flow
    }
}

impl<'b, 'ctx: 'b, E: Effect<'ctx, ControlFlow<(), ()>>> 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.as_obj().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<'_, 'ctx, OwnedStatic<bool>, E> + 'a>() => {
                if self.inner.as_obj_mut().upcast_to_id_mut(id).is_some() {
                    Some(IndirectLtAny::<'a, 'ctx, _>::new::<
                        dyn Value<'_, 'ctx, OwnedStatic<bool>, E> + 'a,
                    >(self as _))
                } else {
                    None
                }
            }
            id => self.inner.as_obj_mut().upcast_to_id_mut(id),
        }
    }
}

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

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