"""Tests for the ``crewai update`` pyproject migration."""

from pathlib import Path

import pytest

from crewai_cli.update_crew import migrate_pyproject


_POETRY_PYPROJECT = """\
[tool.poetry]
name = "demo"
version = "0.1.0"
description = "demo crew"
authors = ["Demo Author <demo@example.com>"]

[tool.poetry.dependencies]
python = ">=3.10,<3.14"
crewai = "^1.0.0"
"""


def _write_project(tmp_path: Path) -> None:
    """Create a minimal Poetry-style project with a lock file in ``tmp_path``."""
    (tmp_path / "pyproject.toml").write_text(_POETRY_PYPROJECT, encoding="utf-8")
    (tmp_path / "poetry.lock").write_text("current lock\n", encoding="utf-8")


def test_migrate_pyproject_backs_up_lock_file(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    """The migration renames ``poetry.lock`` to ``poetry-old.lock`` and backs up pyproject."""
    monkeypatch.chdir(tmp_path)
    _write_project(tmp_path)

    migrate_pyproject("pyproject.toml", "pyproject.toml")

    assert not (tmp_path / "poetry.lock").exists()
    assert (tmp_path / "poetry-old.lock").read_text(encoding="utf-8") == (
        "current lock\n"
    )
    assert (tmp_path / "pyproject-old.toml").exists()


def test_migrate_pyproject_overwrites_existing_lock_backup(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    """A second ``crewai update`` must replace a stale ``poetry-old.lock``.

    ``os.rename`` refuses to overwrite an existing destination on Windows
    (``FileExistsError``) while POSIX replaces it silently, so re-running the
    migration used to fail only on Windows.
    """
    monkeypatch.chdir(tmp_path)
    _write_project(tmp_path)
    (tmp_path / "poetry-old.lock").write_text("stale backup\n", encoding="utf-8")

    migrate_pyproject("pyproject.toml", "pyproject.toml")

    assert not (tmp_path / "poetry.lock").exists()
    assert (tmp_path / "poetry-old.lock").read_text(encoding="utf-8") == (
        "current lock\n"
    )