use core::fmt::{Debug, Display};
use effectful::{
    bound::{Bool, Dynamic, IsSend, IsSync},
    effective::{Canonical, Effective},
    environment::Environment,
    forward_send_sync, DynBind, SendSync,
};
use mockall::mock;
use treaty::{
    any::{AnyTrait, MutAnyUnsized, WithLtTypeId},
    build::BuilderTypes,
    protocol::{AsVisitor, DynVisitor},
    Builder,
};

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

use super::ContextGuard;

use crate::common::builder::__mock_MockBuilder::__from_seed::Context;

#[derive(Debug, SendSync)]
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, E: Environment> {
        pub fn from_seed(seed: Seed) -> Self;
        pub fn build(self) -> Result<Value, Error>;

        // pub fn traits(&self, id: WithLtTypeId<'_, '_>) -> &Option<Box<DynamicShim<dyn for<'ctx> AnyTrait<'ctx, E>>>>;
        // pub fn traits_mut(&mut self, id: WithLtTypeId<'_, '_>) -> &mut Option<Box<DynamicShim<dyn for<'ctx> AnyTrait<'ctx, E>>>>;

        pub fn traits_mut(&mut self) -> &mut Box<dyn for<'r, 'src> FnMut(WithLtTypeId<'src>, &'r ()) -> Option<MutAnyUnsized<'r, 'src>> + Send>;
    }
}

forward_send_sync!({Seed: ('static), Error: ('static)} {} {Value: ('static + Send), E: (Environment + Send)} MockBuilder<Seed, Value, Error, E>);

impl<Seed, Value, Error: Display + Debug, E: Environment> BuilderTypes<E>
    for MockBuilder<Seed, Value, Error, E>
where
    Seed: DynBind<E>,
    Dynamic<Value>: DynBind<E>,
    Error: DynBind<E>,
{
    type Seed = Seed;

    type Error = Error;

    type Output = Dynamic<Value>;

    type Value = Value;

    fn unwrap_output(output: Self::Output) -> Self::Value {
        output.0
    }
}

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

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

impl<
        'ctx,
        Seed: DynBind<E>,
        Value: Send,
        Error: DynBind<E> + Display + Debug,
        E: Environment + Send,
    > Builder<'ctx, E> for MockBuilder<Seed, Value, Error, E>
where
    Dynamic<Value>: DynBind<E>,
{
    fn from_seed<'a>(seed: Self::Seed) -> Canonical<'a, Self, E>
    where
        Self: 'a,
    {
        E::value(Self::from_seed(seed)).cast()
    }

    fn build<'a>(self) -> Canonical<'a, Result<Self::Output, Self::Error>, E>
    where
        Self: 'a,
    {
        E::value(self.build().map(Dynamic)).cast()
    }
}

impl<'ctx, Seed, Value: Send, Error: Display + Debug, E: Environment + Send> AsVisitor<'ctx, E>
    for MockBuilder<Seed, Value, Error, E>
where
    Seed: DynBind<E>,
    Error: DynBind<E>,
    Dynamic<Value>: DynBind<E>,
{
    fn as_visitor(&mut self) -> DynVisitor<'_, 'ctx, E> {
        DynVisitor::new(self)
    }
}

impl<'ctx, Seed, Value, Error, E: Environment> AnyTrait<'ctx> for MockBuilder<Seed, Value, Error, E>
where
    Seed: DynBind<E>,
    Error: DynBind<E>,
    Dynamic<Value>: DynBind<E>,
{
    fn upcast_by_id(
        &self,
        id: treaty::any::WithLtTypeId<'ctx>,
    ) -> Option<treaty::any::RefAnyUnsized<'_, 'ctx>> {
        let _id = id;
        None
    }

    fn upcast_by_id_mut(
        &mut self,
        id: treaty::any::WithLtTypeId<'ctx>,
    ) -> Option<treaty::any::MutAnyUnsized<'_, 'ctx>> {
        self.traits_mut()(id, &())
    }

    // fn upcast_to_id<'a>(
    //     &'a self,
    //     id: TypeNameId,
    // ) -> Option<AnyTraitObject<'a, 'ctx, indirect::Ref, E>>
    // where
    //     'ctx: 'a,
    // {
    //     // Find the first trait handler that wants to upcast.
    //     self.traits(id).as_ref().and_then(|t| t.0.upcast_to_id(id))
    // }
    //
    // fn upcast_to_id_mut<'a>(
    //     &'a mut self,
    //     id: TypeNameId,
    // ) -> Option<AnyTraitObject<'a, 'ctx, indirect::Mut, E>>
    // where
    //     'ctx: 'a,
    // {
    //     // Find the first trait handler that wants to upcast.
    //     self.traits_mut(id)
    //         .as_mut()
    //         .and_then(|t| t.0.upcast_to_id_mut(id))
    // }
    //
    // type Available = () where Self: Sized;
}