use std::cmp::Ordering;

/// Convert a hexadecimal hash into its corresponding `ObjectId` or _panic_.
fn hex_to_id(hex: &str) -> gix_hash::ObjectId {
    gix_hash::ObjectId::from_hex(hex.as_bytes()).expect("40 bytes hex")
}

use crate::basic_repo;

#[test]
fn short_id() -> crate::Result {
    let repo = basic_repo()?;
    let commit = repo.head_commit()?;
    assert_eq!(commit.short_id()?.cmp_oid(&commit.id), Ordering::Equal);
    Ok(())
}

#[test]
fn tree() -> crate::Result {
    let repo = basic_repo()?;
    let commit = repo.head_commit()?;

    let tree = commit.tree()?;
    assert_eq!(tree.id, commit.tree_id().expect("id present"));

    // It's possible to convert a `gix::Tree` into a lower-level tree modify it.
    let _modififyable_tree: gix::objs::Tree = tree.try_into()?;

    assert_eq!(
        commit.tree_id().ok().map(|id| id.detach()),
        Some(hex_to_id("21d3ba9a26b790a4858d67754ae05d04dfce4d0c"))
    );
    Ok(())
}

#[test]
fn decode() -> crate::Result {
    let repo = basic_repo()?;
    let commit = repo.head_commit()?;
    assert_eq!(commit.decode()?.message, commit.message_raw()?);
    assert_eq!(commit.decode()?.message(), commit.message()?);
    assert_eq!(commit.decode()?.message, "c2\n");
    Ok(())
}