import importlib
import os
import sys
import unittest
from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[1]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))


def _reload_analysis(backend: str):
    os.environ["JOURNAL_NLP_BACKEND"] = backend
    import journal.core.config as config
    import journal.ai.analysis as analysis

    importlib.reload(config)
    importlib.reload(analysis)
    return analysis


class AiBackendTests(unittest.TestCase):
    def test_auto_backend_resolves_without_crashing(self):
        analysis = _reload_analysis("auto")
        backend = analysis.get_nlp_backend()
        self.assertIn(backend, {"spacy", "fallback"})

    def test_fallback_backend_forced(self):
        analysis = _reload_analysis("fallback")
        self.assertEqual(analysis.get_nlp_backend(), "fallback")
        themes = analysis.extract_themes(
            "rain rain rain over city streets and rain over old memories"
        )
        self.assertIsInstance(themes, list)

    def test_spacy_forced_is_explicit(self):
        analysis = _reload_analysis("spacy")
        try:
            backend = analysis.get_nlp_backend()
        except RuntimeError:
            return
        self.assertEqual(backend, "spacy")


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