//! Building bare git repositories for the git browser, issue and SSH tests.
//!
//! Written with gitoxide, the same library the server reads through.

use gix::objs::tree::EntryKind;

/// Initialize a bare repo at `<dir>/<owner>/<name>.git`.
pub(crate) fn init_bare(dir: &std::path::Path, owner: &str, name: &str) -> gix::Repository {
    let bare_path = dir.join(owner).join(format!("{name}.git"));
    std::fs::create_dir_all(&bare_path).unwrap();
    gix::init_bare(&bare_path).unwrap()
}

/// Write a blob and return its id.
pub(crate) fn blob(repo: &gix::Repository, content: &[u8]) -> gix::ObjectId {
    repo.write_blob(content).unwrap().detach()
}

/// Write a tree from `(name, id, kind)` entries.
pub(crate) fn tree(
    repo: &gix::Repository,
    entries: &[(&str, gix::ObjectId, EntryKind)],
) -> gix::ObjectId {
    let mut tree = gix::objs::Tree::empty();
    for (name, oid, kind) in entries {
        tree.entries.push(gix::objs::tree::Entry {
            mode: (*kind).into(),
            filename: (*name).into(),
            oid: *oid,
        });
    }
    tree.entries.sort();
    repo.write_object(&tree).unwrap().detach()
}

/// Commit a tree onto `refs/heads/main` with a fixed test identity.
pub(crate) fn commit(
    repo: &gix::Repository,
    message: &str,
    tree: gix::ObjectId,
    parents: Vec<gix::ObjectId>,
) -> gix::ObjectId {
    let signature = gix::actor::SignatureRef {
        name: "Test".into(),
        email: "test@example.com".into(),
        time: "1700000000 +0000",
    };
    repo.commit_as(
        signature,
        signature,
        "refs/heads/main",
        message,
        tree,
        parents,
    )
    .unwrap()
    .detach()
}

/// Tip commit sha of `refs/heads/main` in an on-disk bare repo.
pub(crate) fn main_tip_sha(dir: &std::path::Path, owner: &str, name: &str) -> String {
    let repo = gix::open(dir.join(owner).join(format!("{name}.git"))).unwrap();
    repo.find_reference("refs/heads/main")
        .unwrap()
        .peel_to_id()
        .unwrap()
        .to_string()
}