import importlib.util
import os
import unittest
from pathlib import Path
from unittest.mock import patch


ROOT = Path(__file__).resolve().parents[1]
SCRIPT = ROOT / "script" / "ai_daily_blog_pipeline.py"


def load_pipeline_module():
    spec = importlib.util.spec_from_file_location("ai_daily_blog_pipeline", SCRIPT)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


class EnvLoadingTests(unittest.TestCase):
    def test_project_env_is_loaded_and_process_env_wins(self):
        module = load_pipeline_module()
        env_text = "LLM_MODEL=file-model\nLLM_BASE_URL=https://file.example/v1\n"

        with patch.object(module.Path, "home", return_value=ROOT / "missing-home"):
            with patch.dict(os.environ, {"LLM_MODEL": "process-model"}, clear=False):
                with patch.object(module, "PROJECT_ENV_PATH", ROOT / ".env.test"):
                    (ROOT / ".env.test").write_text(env_text, encoding="utf-8")
                    try:
                        env = module.load_env()
                    finally:
                        (ROOT / ".env.test").unlink(missing_ok=True)

        self.assertEqual(env["LLM_BASE_URL"], "https://file.example/v1")
        self.assertEqual(env["LLM_MODEL"], "process-model")


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