"""Regression for an execution-path error, unrelated to brain dynamics."""
from pathlib import Path
from unittest import TestCase,main,mock,skipIf
import os
import sys
import tempfile
from oracle_apl import _python_entry


class PythonEntryTests(TestCase):
    @skipIf(os.name=='nt','Real POSIX interpreter symlink is validated on the task server')
    def test_real_symlink_remains_invocation_path(self):
        with tempfile.TemporaryDirectory(prefix='phase4ag-entry-') as folder:
            path=Path(folder)/'python'
            path.symlink_to(sys.executable)
            self.assertEqual(_python_entry(path),path)
            self.assertNotEqual(_python_entry(path),path.resolve())

    @skipIf(os.name=='nt','POSIX dangling symlink test is validated on the task server')
    def test_real_dangling_link_and_directory_rejected(self):
        with tempfile.TemporaryDirectory(prefix='phase4ag-entry-') as folder:
            path=Path(folder)/'python'
            path.symlink_to(Path(folder)/'absent')
            with self.assertRaises(ValueError):_python_entry(path)
            with self.assertRaises(ValueError):_python_entry(Path(folder))

    def test_preserves_declared_venv_path_without_resolving_symlink(self):
        entry=Path.cwd()/'.fixture-venv/bin/python'
        with mock.patch.object(Path,'resolve',side_effect=AssertionError('Must not resolve interpreter symlink')):
            with mock.patch.object(Path,'is_file',return_value=True):
                self.assertEqual(_python_entry(entry),entry)

    def test_missing_python_entry_is_rejected(self):
        with mock.patch.object(Path,'is_file',return_value=False):
            with self.assertRaises(ValueError):_python_entry('/missing/python')


if __name__=='__main__':main()