#![allow(missing_docs)]
pub mod references {
    use std::cell::Ref;

    use crate::easy;

    /// An iterator over references
    #[must_use]
    pub struct State<'r, A>
    where
        A: easy::Access + Sized,
    {
        pub(crate) repo: A::RepoRef,
        pub(crate) packed_refs: Ref<'r, easy::reference::packed::ModifieablePackedRefsBuffer>,
        pub(crate) access: &'r A,
    }

    pub struct Iter<'r, A> {
        inner: git_ref::file::iter::LooseThenPacked<'r, 'r>,
        access: &'r A,
    }

    impl<'r, A> State<'r, A>
    where
        A: easy::Access + Sized,
    {
        pub fn all(&self) -> Result<Iter<'_, A>, init::Error> {
            let repo = self.repo.deref();
            Ok(Iter {
                inner: repo.refs.iter(self.packed_refs.packed_refs.as_ref())?,
                access: self.access,
            })
        }

        pub fn prefixed(&self, prefix: impl AsRef<Path>) -> Result<Iter<'_, A>, init::Error> {
            let repo = self.repo.deref();
            Ok(Iter {
                inner: repo.refs.iter_prefixed(self.packed_refs.packed_refs.as_ref(), prefix)?,
                access: self.access,
            })
        }
    }

    impl<'r, A> Iterator for Iter<'r, A>
    where
        A: easy::Access + Sized,
    {
        type Item = Result<easy::Reference<'r, A>, Box<dyn std::error::Error + Send + Sync + 'static>>;

        fn next(&mut self) -> Option<Self::Item> {
            self.inner.next().map(|res| {
                res.map_err(|err| Box::new(err) as Box<dyn std::error::Error + Send + Sync + 'static>)
                    .map(|r| easy::Reference::from_ref(r, self.access))
            })
        }
    }

    pub mod init {
        #[derive(Debug, thiserror::Error)]
        pub enum Error {
            #[error(transparent)]
            Io(#[from] std::io::Error),
        }
    }

    mod error {
        use crate::easy;

        #[derive(Debug, thiserror::Error)]
        pub enum Error {
            #[error(transparent)]
            PackedRefsOpen(#[from] git_ref::packed::buffer::open::Error),
            #[error("BUG: Part of interior state could not be borrowed.")]
            BorrowState(#[from] easy::borrow::state::Error),
            #[error("BUG: The repository could not be borrowed")]
            BorrowRepo(#[from] easy::borrow::repo::Error),
        }

        impl From<easy::reference::packed::Error> for Error {
            fn from(err: easy::reference::packed::Error) -> Self {
                match err {
                    easy::reference::packed::Error::PackedRefsOpen(err) => Error::PackedRefsOpen(err),
                    easy::reference::packed::Error::BorrowState(err) => Error::BorrowState(err),
                }
            }
        }
    }
    use std::{ops::Deref, path::Path};

    pub use error::Error;
}