import unittest
from unittest.mock import mock_open, patch

from dependabro.utils import load_module_versions_cache


class TestLoadModuleVersionsCache(unittest.TestCase):

    @patch("os.path.exists", return_value=True)
    @patch("builtins.open", new_callable=mock_open, read_data='{"module1": "v1.0.0"}')
    def test_returns_cached_module_versions(self, mock_open, mock_exists):
        success, module_versions = load_module_versions_cache(
            "/path/to/cache_file.json"
        )
        self.assertTrue(success)
        self.assertEqual(module_versions, {"module1": "v1.0.0"})

    @patch("os.path.exists", return_value=True)
    @patch("builtins.open", new_callable=mock_open, read_data="invalid json")
    def test_handles_corrupted_cache_file(self, mock_open, mock_exists):
        with self.assertLogs(level="WARNING") as log:
            success, module_versions = load_module_versions_cache(
                "/path/to/cache_file.json"
            )
        self.assertFalse(success)
        self.assertEqual(module_versions, {})
        self.assertIn(
            "Cache file is corrupted. It needs to be refreshed.", log.output[0]
        )

    @patch("os.path.exists", return_value=False)
    def test_handles_missing_cache_file(self, mock_exists):
        success, module_versions = load_module_versions_cache(
            "/path/to/cache_file.json"
        )
        self.assertFalse(success)
        self.assertEqual(module_versions, {})


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