import os
from datetime import timedelta

basedir = os.path.abspath(os.path.dirname(__file__))

class Config:
    """Base config."""
    SECRET_KEY = os.environ.get('SECRET_KEY', 'dev-key-placeholder')
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SESSION_COOKIE_SECURE = True
    SESSION_COOKIE_HTTPONLY = True
    REMEMBER_COOKIE_DURATION = timedelta(days=14)
    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16 MB max upload
    
    # Security headers
    SECURITY_HEADERS = {
        'X-Content-Type-Options': 'nosniff',
        'X-Frame-Options': 'SAMEORIGIN',
        'X-XSS-Protection': '1; mode=block',
        # 'Content-Security-Policy': "default-src 'self'; script-src 'self' https://cdn.jsdelivr.net https://unpkg.com https://cdnjs.cloudflare.com 'unsafe-inline'; style-src 'self' https://cdn.jsdelivr.net https://cdnjs.cloudflare.com https://fonts.googleapis.com 'unsafe-inline'; font-src 'self' https://cdn.jsdelivr.net https://cdnjs.cloudflare.com https://fonts.gstatic.com data:; img-src 'self' data:;"
    }
    
    @staticmethod
    def init_app(app):
        pass

class DevelopmentConfig(Config):
    """Development config."""
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = os.environ.get('DEV_DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'app-dev.db')
    SESSION_COOKIE_SECURE = False

class TestingConfig(Config):
    """Testing config."""
    TESTING = True
    SQLALCHEMY_DATABASE_URI = os.environ.get('TEST_DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'app-test.db')
    WTF_CSRF_ENABLED = False
    SESSION_COOKIE_SECURE = False

class ProductionConfig(Config):
    """Production config."""
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        'postgresql://user:password@localhost/production'
        
    @classmethod
    def init_app(cls, app):
        Config.init_app(app)
        
        # Log to stdout/stderr
        import logging
        from logging.handlers import RotatingFileHandler
        
        file_handler = RotatingFileHandler('logs/netdocs.log', maxBytes=10240, backupCount=10)
        file_handler.setFormatter(logging.Formatter(
            '%(asctime)s %(levelname)s: %(message)s [in %(pathname)s:%(lineno)d]'
        ))
        file_handler.setLevel(logging.INFO)
        app.logger.addHandler(file_handler)
        app.logger.setLevel(logging.INFO)
        app.logger.info('NetDocs startup')

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