import os
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

from training_coach.env import load_local_env


class EnvTests(unittest.TestCase):
    def test_load_local_env_sets_missing_values_without_overriding_existing(self):
        with tempfile.TemporaryDirectory() as temp_dir:
            env_path = Path(temp_dir) / ".env"
            env_path.write_text(
                "\n".join(
                    [
                        "# comment",
                        "PARSER_BACKEND=llama_cpp",
                        "OLLAMA_MODEL='qwen3:1.7B'",
                        "EXISTING=value-from-file",
                    ]
                )
            )

            with patch.dict(os.environ, {"EXISTING": "value-from-env"}, clear=True):
                load_local_env(env_path)

                self.assertEqual(os.environ["PARSER_BACKEND"], "llama_cpp")
                self.assertEqual(os.environ["OLLAMA_MODEL"], "qwen3:1.7B")
                self.assertEqual(os.environ["EXISTING"], "value-from-env")


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