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///
pub mod existing {
    use git_hash::ObjectId;

    /// The error returned by the [`find(…)`][crate::FindExt::find()] trait methods.
    #[derive(Debug, thiserror::Error)]
    #[allow(missing_docs)]
    pub enum Error<T: std::error::Error + 'static> {
        #[error(transparent)]
        Find(T),
        #[error("An object with id {} could not be found", .oid)]
        NotFound { oid: ObjectId },
    }
}

///
pub mod existing_object {
    use git_hash::ObjectId;

    /// The error returned by the various [`find_*()`][crate::FindExt::find_commit()] trait methods.
    #[derive(Debug, thiserror::Error)]
    #[allow(missing_docs)]
    pub enum Error<T: std::error::Error + 'static> {
        #[error(transparent)]
        Find(T),
        #[error(transparent)]
        Decode(git_object::decode::Error),
        #[error("An object with id {oid} could not be found")]
        NotFound { oid: ObjectId },
        #[error("Expected object of kind {expected}")]
        ObjectKind { expected: git_object::Kind },
    }
}

///
pub mod existing_iter {
    use git_hash::ObjectId;

    /// The error returned by the various [`find_*_iter()`][crate::FindExt::find_commit_iter()] trait methods.
    #[derive(Debug, thiserror::Error)]
    #[allow(missing_docs)]
    pub enum Error<T: std::error::Error + 'static> {
        #[error(transparent)]
        Find(T),
        #[error("An object with id {oid} could not be found")]
        NotFound { oid: ObjectId },
        #[error("Expected object of kind {expected}")]
        ObjectKind { expected: git_object::Kind },
    }
}

/// An object header informing about object properties, without it being fully decoded in the process.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum Header {
    /// The object was not packed, but is currently located in the loose object portion of the database.
    ///
    /// As packs are searched first, this means that in this very moment, the object whose header we retrieved is unique
    /// in the object database.
    Loose {
        /// The kind of the object.
        kind: git_object::Kind,
        /// The size of the object's data in bytes.
        size: u64,
    },
    /// The object was present in a pack.
    ///
    /// Note that this does not imply it is unique in the database, as it might be present in more than one pack and even
    /// as loose object.
    Packed(git_pack::data::decode::header::Outcome),
}

mod header {
    use super::Header;

    impl Header {
        /// Return the object kind of the object we represent.
        pub fn kind(&self) -> git_object::Kind {
            match self {
                Header::Packed(out) => out.kind,
                Header::Loose { kind, .. } => *kind,
            }
        }
        /// Return the size of the object in bytes.
        pub fn size(&self) -> u64 {
            match self {
                Header::Packed(out) => out.object_size,
                Header::Loose { size, .. } => *size,
            }
        }
        /// Return the amount of deltas decoded to obtain this header, if the object was packed.
        pub fn num_deltas(&self) -> Option<u32> {
            match self {
                Header::Packed(out) => out.num_deltas.into(),
                Header::Loose { .. } => None,
            }
        }
    }

    impl From<git_pack::data::decode::header::Outcome> for Header {
        fn from(packed_header: git_pack::data::decode::header::Outcome) -> Self {
            Header::Packed(packed_header)
        }
    }

    impl From<(usize, git_object::Kind)> for Header {
        fn from((object_size, kind): (usize, git_object::Kind)) -> Self {
            Header::Loose {
                kind,
                size: object_size as u64,
            }
        }
    }
}