treaty -


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use std::{collections::VecDeque, ops::ControlFlow};
use treaty::{
    any::{any_trait, static_wrapper::OwnedStatic},
    build, build_with,
    builders::core::array,
    into_walker,
    protocol::{
        visitor::{Sequence, SequenceScope, Value},
        ControlFlowFor, SyncEffect, Visitor,
    },
    Builder, Walk, Walker,
};

#[test]
fn demo() {
    let a = Data::Sequence(vec![
        Data::Bool(true),
        Data::Sequence(vec![Data::Bool(false), Data::Bool(true)]),
        Data::Bool(false),
    ]);

    dbg!(array_to_array2([true, false]));
    dbg!(array_to_array([true, true]));

    let s = build_with::<array::Builder<'_, JsonLike, 3>, _>(into_walker(&a)).unwrap();
    dbg!(s);

    use treaty::builders::serde::deserialize::Builder as SerdeBuilder;

    let x = build_with::<SerdeBuilder<serde_json::Value>, _>(into_walker(&a)).unwrap();
    dbg!(x);

    // let s = build_with::<JsonLike, _>(into_walker(a)).unwrap();

    todo!();
    // assert_eq!(s, "[true,[false,true,],false,]");
}

#[inline(never)]
pub fn array_to_array(x: [bool; 2]) -> [bool; 2] {
    build(into_walker(x)).unwrap()
}

#[inline(never)]
pub fn array_to_array2(x: [bool; 2]) -> [bool; 2] {
    array_to_array(x)
}

#[derive(Debug)]
enum Data {
    Bool(bool),
    Sequence(Vec<Data>),
}

const _: () = {
    struct Impl<'ctx>(&'ctx Data);

    impl<'ctx> From<&'ctx Data> for Impl<'ctx> {
        fn from(value: &'ctx Data) -> Self {
            Self(value)
        }
    }

    impl<'ctx> Walk<'ctx> for &'ctx Data {
        type Walker = Impl<'ctx>;
    }

    impl<'ctx> Walker<'ctx> for Impl<'ctx> {
        type Effect = SyncEffect;

        type Error = ();

        type Output = ();

        fn walk<'a>(
            self,
            visitor: &'a mut Visitor<'a, 'ctx>,
        ) -> ControlFlowFor<'a, SyncEffect, Self::Error, Self::Output> {
            match self.0 {
                Data::Bool(value) => walk_bool(*value, visitor),
                Data::Sequence(value) => walk_vec(value, visitor),
            }
            core::ops::ControlFlow::Continue(())
        }
    }
};

fn walk_bool(value: bool, visitor: &mut Visitor<'_, '_>) {
    visitor
        .upcast_mut::<dyn Value<OwnedStatic<bool>>>()
        .unwrap()
        .visit(OwnedStatic(value));
}

fn walk_vec<'a, 'ctx>(value: &'ctx [Data], visitor: &'a mut Visitor<'a, 'ctx>) {
    struct Scope<'ctx>(VecDeque<&'ctx Data>);

    impl<'ctx> SequenceScope<'ctx> for Scope<'ctx> {
        fn next<'a>(
            &'a mut self,
            visitor: &'a mut Visitor<'a, 'ctx>,
        ) -> ControlFlowFor<'a, SyncEffect, treaty::protocol::visitor::Status> {
            if let Some(value) = self.0.pop_front() {
                into_walker(value).walk(visitor);

                ControlFlow::Continue(treaty::protocol::visitor::Status::Continue)
            } else {
                ControlFlow::Continue(treaty::protocol::visitor::Status::Done)
            }
        }
    }

    let mut scope = Scope(value.into_iter().collect());

    visitor
        .upcast_mut::<dyn Sequence<'_>>()
        .unwrap()
        .visit(&mut scope);
}

#[derive(Default)]
struct JsonLike(String);

impl<'ctx> Builder<'ctx> for JsonLike {
    type Error = ();

    type Value = String;

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

    fn build(self) -> Result<Self::Value, Self::Error> {
        Ok(self.0)
    }

    type Seed = ();

    fn from_seed(seed: Self::Seed) -> Self {
        Self::default()
    }
}

any_trait! {
    impl['a, 'ctx] JsonLike = [
        dyn Value<'a, OwnedStatic<bool>> + 'a,
        dyn Sequence<'ctx> + 'a,
    ]
}

impl Value<'_, OwnedStatic<bool>> for JsonLike {
    fn visit(&mut self, value: OwnedStatic<bool>) -> ControlFlowFor<'_> {
        self.0.push_str(&format!("{}", value.0));
        ControlFlow::Continue(())
    }
}

impl<'ctx> Sequence<'ctx> for JsonLike {
    fn visit<'a>(
        &'a mut self,
        scope: &'a mut dyn SequenceScope<'ctx>,
    ) -> ControlFlowFor<'a, SyncEffect> {
        self.0.push_str("[");
        while let ControlFlow::Continue(treaty::protocol::visitor::Status::Continue) =
            scope.next(self)
        {
            self.0.push_str(",");
        }
        self.0.push_str("]");
        ControlFlow::Continue(())
    }
}