"""Offline path configuration checks; no external services."""
import os
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

from step2_graph_building.config import get_metadata_template_dir, get_relation_path


class TemplatePathTests(unittest.TestCase):
    def test_relative_paths_use_project_root_from_another_working_directory(self):
        project = Path(__file__).resolve().parents[1]
        previous = Path.cwd()
        with tempfile.TemporaryDirectory() as elsewhere, patch.dict(os.environ, {
            'METADATA_TEMPLATE_DIR': 'data/templates/metadata', 'RELATION_DIR': 'data/templates',
        }):
            try:
                os.chdir(elsewhere)
                self.assertEqual(get_metadata_template_dir(), project / 'data/templates/metadata')
                self.assertEqual(get_relation_path(), project / 'data/templates/relation.xlsx')
            finally:
                os.chdir(previous)

    def test_custom_env_external_directories_and_process_override(self):
        with tempfile.TemporaryDirectory() as tmp, patch.dict(os.environ, {}, clear=True):
            root = Path(tmp)
            metadata = root / '外部 metadata'
            relations = root / '外部 relations'
            metadata.mkdir()
            relations.mkdir()
            (relations / 'relation.xlsx').touch()
            config = root / 'custom.env'
            config.write_text(f'METADATA_TEMPLATE_DIR="{metadata.as_posix()}"\nRELATION_DIR="{relations.as_posix()}"\n', encoding='utf-8')
            self.assertEqual(get_metadata_template_dir(config), metadata)
            self.assertEqual(get_relation_path(config), relations / 'relation.xlsx')
            override = root / 'override'
            override.mkdir()
            os.environ['METADATA_TEMPLATE_DIR'] = str(override)
            self.assertEqual(get_metadata_template_dir(config), override)

    def test_missing_blank_directory_and_missing_fixed_filename_fail(self):
        with tempfile.TemporaryDirectory() as tmp, patch('step2_graph_building.config._load'), patch.dict(os.environ, {}, clear=True):
            root = Path(tmp)
            for bad in (None, '', str(root / 'missing')):
                if bad is None:
                    os.environ.pop('METADATA_TEMPLATE_DIR', None)
                else:
                    os.environ['METADATA_TEMPLATE_DIR'] = bad
                with self.assertRaises((RuntimeError, ValueError)):
                    get_metadata_template_dir()
            file = root / 'not-a-directory'
            file.touch()
            os.environ['METADATA_TEMPLATE_DIR'] = str(file)
            with self.assertRaises(ValueError):
                get_metadata_template_dir()
            os.environ['RELATION_DIR'] = str(root)
            (root / 'renamed.xlsx').touch()
            with self.assertRaisesRegex(ValueError, 'relation.xlsx'):
                get_relation_path()


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