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


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


class InstallPythonProfileTests(unittest.TestCase):
    def test_service_probe_must_be_absolute_regular_and_executable(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            with self.assertRaisesRegex(ValueError, "SERVICE_HEALTH_PROBE_NOT_ABSOLUTE"):
                MODULE.validate_service_probe(Path("relative-probe"))
            probe = root / "probe"
            probe.write_text("#!/bin/sh\nexit 0\n")
            with self.assertRaisesRegex(ValueError, "SERVICE_HEALTH_PROBE_NOT_EXECUTABLE"):
                MODULE.validate_service_probe(probe)
            os.chmod(probe, 0o700)
            MODULE.validate_service_probe(probe)

    def test_service_probe_failure_and_timeout_are_failures(self):
        with tempfile.TemporaryDirectory() as directory:
            probe = Path(directory) / "probe"
            probe.write_text("#!/bin/sh\nexit 23\n")
            os.chmod(probe, 0o700)
            with self.assertRaises(Exception):
                MODULE.service_health(probe, Path(directory), "cpu-only", 1)
            with self.assertRaisesRegex(ValueError, "SERVICE_HEALTH_TIMEOUT_INVALID"):
                MODULE.install(Path("journal"), Path("checkpoint"), Path("target"),
                               Path("wheels"), Path("requirements"), Path(sys.executable),
                               probe, 0)

    def test_failed_offline_resolution_rolls_back_without_target_change(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            target = root / "venv"
            target.mkdir()
            (target / "old").write_text("old")
            checkpoint = root / "checkpoint"
            manifest = MODULE.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)
            MODULE.journal_api.update(journal, expected_generation=current["generation"],
                                      state="checkpoint_ready",
                                      checkpoint_id=manifest["inventory_sha256"], **identity)
            requirements = root / "requirements.txt"
            requirements.write_text("definitely-not-a-real-package==1\n")
            wheels = root / "wheels"
            wheels.mkdir()
            with self.assertRaises(Exception):
                MODULE.install(journal, checkpoint, target, wheels, requirements, Path(sys.executable))
            self.assertEqual((target / "old").read_text(), "old")
            self.assertEqual(MODULE.journal_api.read_verified(journal)["state"], "rolled_back")

    def test_recover_activated_target_restores_checkpoint(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            target = root / "venv"
            target.mkdir()
            (target / "marker").write_text("old")
            checkpoint = root / "checkpoint"
            manifest = MODULE.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((root / ".venv.rollback-discard/marker").read_text(), "activated")


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