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use std::path::PathBuf;

use crate::store::WriteReflog;

mod error {
    use quick_error::quick_error;

    quick_error! {
        /// The error returned by [crate::Store::at()].
        #[derive(Debug)]
        #[allow(missing_docs)]
        pub enum Error {
            Io(err: std::io::Error) {
                display("There was an error accessing the store's directory")
                from()
                source(err)
            }
        }
    }
}

pub use error::Error;

use crate::file;

impl crate::Store {
    /// Create a new store at the given location, typically the `.git/` directory.
    ///
    /// `object_hash` defines the kind of hash to assume when dealing with refs.
    pub fn at(
        git_dir: impl Into<PathBuf>,
        reflog_mode: WriteReflog,
        object_hash: git_hash::Kind,
    ) -> Result<Self, Error> {
        // for now, just try to read the directory - later we will do that naturally as we have to figure out if it's a ref-table or not.
        let git_dir = git_dir.into();
        std::fs::read_dir(&git_dir)?;
        Ok(crate::Store {
            inner: crate::store::State::Loose {
                store: file::Store::at(git_dir, reflog_mode, object_hash),
            },
        })
    }
}