"""Model-dir resolution + LFS pointer detection."""

from __future__ import annotations

from pathlib import Path

from palimpseste.serialization import is_lfs_pointer, resolve_model_dir


def test_lfs_pointer_detection(tmp_path: Path):
    p = tmp_path / "palimpseste_memory.bin"
    p.write_text(
        "version https://git-lfs.github.com/spec/v1\n"
        "oid sha256:deadbeef\n"
        "size 123\n"
    )
    assert is_lfs_pointer(p)
    big = tmp_path / "real.bin"
    big.write_bytes(b"x" * 2048)
    assert not is_lfs_pointer(big)


def test_resolve_nested_dir(tmp_path: Path):
    nested = tmp_path / "palimpseste-max"
    nested.mkdir()
    (nested / "config.json").write_text('{"D": 8}')
    assert resolve_model_dir(tmp_path) == nested
    (tmp_path / "config.json").write_text('{"D": 8}')
    assert resolve_model_dir(tmp_path) == tmp_path