import os
from datetime import timedelta

class Config:
    """Configuration de base"""
    SECRET_KEY = os.environ.get('SECRET_KEY') or os.urandom(32)
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or 'sqlite:///school_management.db'
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    WTF_CSRF_TIME_LIMIT = timedelta(hours=1)
    
class DevelopmentConfig(Config):
    """Configuration pour le développement"""
    DEBUG = True
    SQLALCHEMY_ECHO = os.environ.get('DB_ECHO', 'False').lower() == 'true'

class ProductionConfig(Config):
    """Configuration pour la production"""
    DEBUG = False
    SQLALCHEMY_ECHO = False
    
    @classmethod
    def init_app(cls, app):
        Config.init_app(app)
        
        # Log vers stderr en production
        import logging
        from logging import StreamHandler
        file_handler = StreamHandler()
        file_handler.setLevel(logging.WARNING)
        app.logger.addHandler(file_handler)

class TestingConfig(Config):
    """Configuration pour les tests"""
    TESTING = True
    SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
    WTF_CSRF_ENABLED = False
    DEBUG = True

config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'testing': TestingConfig,
    'default': DevelopmentConfig
}