use crate::{ProjectInput, Result};
use std::{collections::BTreeMap, future::Future, pin::Pin};

pub type Documents = BTreeMap<String, String>;
pub type Refresh<'a> = Pin<Box<dyn Future<Output = Result<ProjectInput>> + 'a>>;

/// The host owns acquisition, configuration and graph invalidation. Each refresh
/// supplies an immutable generation; the native adapter never discovers imports.
/// This future may be local: avril's runtime resolver uses thread-local graph state.
pub trait ProjectService {
    fn refresh(&mut self, documents: Documents) -> Refresh<'_>;
    fn changed(&mut self) -> bool {
        false
    }
}