import pytest
import os
from unittest.mock import patch, MagicMock
from config.settings import Settings


class TestSettings:
    """Tests pour la classe Settings."""
    
    @patch('config.settings.load_dotenv')
    def test_settings_with_valid_secret_key(self, mock_load_dotenv):
        """Test avec une clé secrète valide."""
        with patch.dict(os.environ, {'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123'}):
            settings = Settings()
            assert len(settings.SECRET_KEY) >= 32
            assert settings.SECRET_KEY == 'this-is-a-very-long-secret-key-for-testing-purposes-123'
    
    @patch('config.settings.load_dotenv')
    def test_settings_with_short_secret_key_raises_error(self, mock_load_dotenv):
        """Test avec une clé secrète trop courte."""
        with patch.dict(os.environ, {'SECRET_KEY': 'short'}, clear=True):
            settings = Settings()
            with pytest.raises(ValueError, match="SECRET_KEY doit faire au moins 32 caractères"):
                _ = settings.SECRET_KEY
    
    @patch('config.settings.load_dotenv')
    def test_settings_without_secret_key_raises_error(self, mock_load_dotenv):
        """Test sans clé secrète."""
        with patch.dict(os.environ, {}, clear=True):
            settings = Settings()
            with pytest.raises(ValueError, match="SECRET_KEY est obligatoire"):
                _ = settings.SECRET_KEY
    
    @patch('config.settings.load_dotenv')
    def test_database_url_default(self, mock_load_dotenv):
        """Test de l'URL de base de données par défaut."""
        with patch.dict(os.environ, {'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123'}):
            settings = Settings()
            assert settings.DATABASE_URL == 'sqlite:///school_management.db'
    
    @patch('config.settings.load_dotenv')
    def test_database_url_custom(self, mock_load_dotenv):
        """Test avec une URL de base de données personnalisée."""
        with patch.dict(os.environ, {
            'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123',
            'DATABASE_URL': 'postgresql://user:pass@localhost/test'
        }):
            settings = Settings()
            assert settings.DATABASE_URL == 'postgresql://user:pass@localhost/test'
    
    @patch('config.settings.load_dotenv')
    def test_debug_default_false(self, mock_load_dotenv):
        """Test que DEBUG est False par défaut."""
        with patch.dict(os.environ, {'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123'}, clear=True):
            settings = Settings()
            assert settings.DEBUG is False
    
    @patch('config.settings.load_dotenv')
    def test_debug_true(self, mock_load_dotenv):
        """Test que DEBUG peut être activé."""
        with patch.dict(os.environ, {
            'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123',
            'DEBUG': 'true'
        }):
            settings = Settings()
            assert settings.DEBUG is True
    
    @patch('config.settings.load_dotenv')
    def test_log_level_default(self, mock_load_dotenv):
        """Test du niveau de log par défaut."""
        with patch.dict(os.environ, {'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123'}):
            settings = Settings()
            assert settings.LOG_LEVEL == 'INFO'
    
    @patch('config.settings.load_dotenv')
    def test_log_level_custom(self, mock_load_dotenv):
        """Test avec un niveau de log personnalisé."""
        with patch.dict(os.environ, {
            'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123',
            'LOG_LEVEL': 'debug'
        }):
            settings = Settings()
            assert settings.LOG_LEVEL == 'DEBUG'
    
    @patch('config.settings.load_dotenv')
    def test_wtf_csrf_time_limit_default(self, mock_load_dotenv):
        """Test du timeout CSRF par défaut."""
        with patch.dict(os.environ, {'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123'}):
            settings = Settings()
            assert settings.WTF_CSRF_TIME_LIMIT == 3600
    
    @patch('config.settings.load_dotenv')
    def test_wtf_csrf_time_limit_custom(self, mock_load_dotenv):
        """Test avec un timeout CSRF personnalisé."""
        with patch.dict(os.environ, {
            'SECRET_KEY': 'this-is-a-very-long-secret-key-for-testing-purposes-123',
            'WTF_CSRF_TIME_LIMIT': '7200'
        }):
            settings = Settings()
            assert settings.WTF_CSRF_TIME_LIMIT == 7200