treaty -


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

use crate::{
    any::static_wrapper::OwnedStatic,
    any_trait,
    effect::{Effect, Future},
    protocol::{visitor::value::Value, Visitor},
};

impl<'ctx> crate::Build<'ctx> for bool {
    type Builder<E: Effect<'ctx>> = Builder<E>;
}

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

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

impl crate::BuilderTypes for bool {
    type Seed = ();

    type Error = Error;

    type Value = bool;
}

impl<E> crate::BuilderTypes for Builder<E> {
    type Error = Error;

    type Value = bool;

    type Seed = ();
}

impl<'ctx, E: Effect<'ctx>> crate::Builder<'ctx> for Builder<E> {
    type Effect = E;

    #[inline]
    fn build<'a>(self) -> Future<'a, 'ctx, Result<Self::Value, Self::Error>, E>
    where
        Self: 'a,
    {
        E::wrap(core::future::ready(self.0.ok_or(Error::Incomplete)))
    }

    fn from_seed<'a>(_seed: Self::Seed) -> Future<'a, 'ctx, Self, E>
    where
        Self: 'a,
    {
        E::wrap(core::future::ready(Self(None, PhantomData)))
    }

    fn as_visitor(&mut self) -> Visitor<'_, 'ctx> {
        self
    }
}

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

impl<'a, 'ctx: 'a, E: Effect<'ctx>> Value<'a, 'ctx, OwnedStatic<bool>> for Builder<E> {
    type Effect = E;

    #[inline]
    fn visit(
        &'a mut self,
        OwnedStatic(value): OwnedStatic<bool>,
    ) -> Future<'a, 'ctx, ControlFlow<(), ()>, E> {
        self.0 = Some(value);
        E::wrap(core::future::ready(ControlFlow::Continue(())))
    }
}