treaty -


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use core::fmt::{Debug, Display};
use mockall::mock;
use treaty::{
    any::{indirect, AnyTrait, AnyTraitObject, TypeNameId},
    effect::{Effect, Effective, ErasedEffective},
    protocol::{AsVisitor, DynVisitor},
    Builder, BuilderTypes,
};

use crate::common::{ContextLock, StaticTypeMap};

use self::__mock_MockBuilder::__from_seed::Context;

use super::ContextGuard;

#[derive(Debug)]
pub struct EmptyError;

impl Display for EmptyError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "EmptyError")
    }
}

mock! {
    pub Builder<Seed: 'static, Value: 'static, Error: 'static> {
        pub fn from_seed(seed: Seed) -> Self;
        pub fn build(self) -> Result<Value, Error>;

        pub fn traits(&self, id: TypeNameId) -> &Option<Box<dyn for<'ctx> AnyTrait<'ctx> + Send + Sync>>;
        pub fn traits_mut(&mut self, id: TypeNameId) -> &mut Option<Box<dyn for<'ctx> AnyTrait<'ctx> + Send + Sync>>;
    }
}

impl<Seed: Send + Sync, Value: Send + Sync, Error: Send + Sync + Display + Debug> BuilderTypes
    for MockBuilder<Seed, Value, Error>
{
    type Seed = Seed;

    type Error = Error;

    type Value = Value;
}

impl<Seed: 'static, Value: 'static, Error: 'static> MockBuilder<Seed, Value, Error> {
    pub fn lock_from_seed_context<'a>() -> ContextGuard<'a, Context<Seed, Value, Error>> {
        static LOCKS: StaticTypeMap = StaticTypeMap::new();

        LOCKS
            .get_or_init(|| {
                ContextLock::new(MockBuilder::from_seed_context(), |context| {
                    context.checkpoint()
                })
            })
            .lock()
    }
}

impl<
        'ctx,
        Seed: Send + Sync,
        Value: Send + Sync,
        Error: Send + Sync + Display + Debug,
        E: Effect,
    > Builder<'ctx, E> for MockBuilder<Seed, Value, Error>
{
    fn from_seed<'a>(seed: Self::Seed) -> ErasedEffective<'a, Self, E>
    where
        Self: 'a,
    {
        E::ready(Self::from_seed(seed))
    }

    fn build<'a>(self) -> ErasedEffective<'a, Result<Self::Value, Self::Error>, E>
    where
        Self: 'a,
    {
        E::ready(self.build())
    }
}

impl<'ctx, Seed: Send + Sync, Value: Send + Sync, Error: Send + Sync + Display + Debug>
    AsVisitor<'ctx> for MockBuilder<Seed, Value, Error>
{
    fn as_visitor<'a>(&'a mut self) -> DynVisitor<'a, 'ctx>
    where
        'ctx: 'a,
    {
        DynVisitor(self)
    }
}

impl<'ctx, Seed, Value, Error> AnyTrait<'ctx> for MockBuilder<Seed, Value, Error> {
    fn upcast_to_id<'a>(&'a self, id: TypeNameId) -> Option<AnyTraitObject<'a, 'ctx, indirect::Ref>>
    where
        'ctx: 'a,
    {
        // Find the first trait handler that wants to upcast.
        self.traits(id).as_ref().and_then(|t| t.upcast_to_id(id))
    }

    fn upcast_to_id_mut<'a>(
        &'a mut self,
        id: TypeNameId,
    ) -> Option<AnyTraitObject<'a, 'ctx, indirect::Mut>>
    where
        'ctx: 'a,
    {
        // Find the first trait handler that wants to upcast.
        self.traits_mut(id)
            .as_mut()
            .and_then(|t| t.upcast_to_id_mut(id))
    }

    type Available = () where Self: Sized;
}