treaty -


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use core::{marker::PhantomData, ops::ControlFlow};

use crate::{
    any::static_wrapper::OwnedStatic,
    any_trait,
    effect::{AsObj, AsyncEffect, Effect, SyncEffect, Yield},
    protocol::visitor::Value,
    AsVisitor,
};

impl<'ctx, E: Effect<'ctx, ControlFlow<(), ()>>> crate::Build<'ctx, E> for bool
where
    Builder<E>: AsVisitor<'ctx, E>,
{
    type Builder = Builder<E>;
}

#[derive(Debug)]
pub enum Error {
    Incomplete,
}

pub struct Builder<E>(Option<bool>, PhantomData<fn() -> E>);

impl<'ctx, E: Effect<'ctx, ControlFlow<(), ()>>> crate::Builder<'ctx, E> for Builder<E>
where
    Self: AsVisitor<'ctx, E>,
{
    type Error = Error;

    type Value = bool;

    #[inline]
    fn build<'a>(self) -> Result<Self::Value, Self::Error>
    where
        Self: 'a,
    {
        self.0.ok_or(Error::Incomplete)
    }

    type Seed = ();

    fn from_seed(_seed: Self::Seed) -> Self {
        Self(None, PhantomData)
    }

    type Effect = SyncEffect;
}

impl<'ctx> AsVisitor<'ctx, SyncEffect> for Builder<SyncEffect> {
    fn as_visitor(&mut self) -> crate::protocol::Visitor<'_, 'ctx, SyncEffect> {
        self
    }
}

impl<'ctx> AsVisitor<'ctx, AsyncEffect> for Builder<AsyncEffect> {
    fn as_visitor(&mut self) -> crate::protocol::Visitor<'_, 'ctx, AsyncEffect> {
        self
    }
}

any_trait! {
    impl['a, 'ctx, E] Builder<E> = [
        dyn Value<'a, 'ctx, OwnedStatic<bool>, SyncEffect> + 'a,
    ]
}

impl<'a, 'ctx: 'a, E> Value<'a, 'ctx, OwnedStatic<bool>, SyncEffect> for Builder<E> {
    #[inline]
    fn visit(
        &'a mut self,
        OwnedStatic(value): OwnedStatic<bool>,
    ) -> Yield<'a, 'ctx, ControlFlow<(), ()>, SyncEffect> {
        self.0 = Some(value);
        ControlFlow::Continue(())
    }
}