import importlib.util
import tempfile
import unittest
from pathlib import Path


MODULE_PATH = Path(__file__).parents[2] / "autoinstall/offline/recover-python-profile-on-boot.py"
SPEC = importlib.util.spec_from_file_location("recover_python_profile_on_boot", MODULE_PATH)
MODULE = importlib.util.module_from_spec(SPEC)
assert SPEC.loader
SPEC.loader.exec_module(MODULE)


class RecoverPythonProfileOnBootTests(unittest.TestCase):
    def test_absent_and_terminal_states_are_noop(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            self.assertEqual(MODULE.recover(root / "missing", root / "cp", root / "target")["action"],
                             "none")

    def test_installing_state_rolls_back(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            target = root / "venv"
            target.mkdir()
            (target / "marker").write_text("old")
            checkpoint = root / "checkpoint"
            manifest = MODULE.installer.checkpoint_api.create(target, checkpoint, "op-1")
            journal = root / "journal.json"
            identity = dict(operation_id="op-1", profile="cpu-only", manifest_sha256="a" * 64)
            current = MODULE.journal_api.update(journal, expected_generation=0,
                                                state="profile_selected", checkpoint_id=None, **identity)
            current = MODULE.journal_api.update(journal, expected_generation=current["generation"],
                                                state="checkpoint_ready",
                                                checkpoint_id=manifest["inventory_sha256"], **identity)
            MODULE.journal_api.update(journal, expected_generation=current["generation"],
                                      state="installing", checkpoint_id=manifest["inventory_sha256"],
                                      **identity)
            (target / "marker").write_text("activated")
            result = MODULE.recover(journal, checkpoint, target)
            self.assertEqual(result["state"], "rolled_back")
            self.assertEqual((target / "marker").read_text(), "old")
            self.assertEqual(MODULE.recover(journal, checkpoint, target)["reason"],
                             "terminal_rolled_back")


if __name__ == "__main__":
    unittest.main()