import unittest
import os
from unittest.mock import patch
from backend.config.database import db_settings

class TestMongoAtlasSettings(unittest.TestCase):

    @patch.dict(os.environ, {
        'VECTOR_STORE_PROVIDER': 'mongodb'
    })
    def test_mongo_settings(self):
        """
        Test mongodb config contains expected fields when VECTOR_STORE_PROVIDER is set
        """
        # reinitialize db_settings instance
        db_settings.__init__()

        db_config = db_settings.get_vector_store_config()
        self.assertTrue('collection_name' in db_config)
        self.assertTrue('index_name' in db_config)
        self.assertTrue('text_field' in db_config)

class TestChromaDBSettings(unittest.TestCase):

    @patch.dict(os.environ, {
        'VECTOR_STORE_PROVIDER': 'chromadb'
    })
    def test_mongo_settings(self):
        """
        Test chromadb config contains expected fields when VECTOR_STORE_PROVIDER is set
        """
        # reinitialize db_settings instance
        db_settings.__init__()

        db_config = db_settings.get_vector_store_config()
        self.assertTrue('collection_name' in db_config)
        self.assertTrue('persist_directory' in db_config)
        self.assertTrue('refresh_on_start' in db_config)

class TestInvalidDBSettings(unittest.TestCase):

    @patch.dict(os.environ, {
        'VECTOR_STORE_PROVIDER': 'postgres'
    })
    def test_mongo_settings(self):
        """
        Test invalid db config raises correct error
        """
        # reinitialize db_settings instance
        db_settings.__init__()

        with self.assertRaisesRegex(ValueError, "Unsupported"):
            db_settings.get_vector_store_config()