"""
Middleware components for the OpenEventDatabase.
"""

import falcon
from oedb.utils.logging import logger

class HeaderMiddleware:
    """
    Middleware that adds standard headers to all responses.
    """
    
    def process_request(self, req, resp, resource, params):
        """
        Handle preflight OPTIONS requests for CORS.
        
        Args:
            req: The request object.
            resp: The response object.
            resource: The resource object.
            params: The request parameters.
        """
        if req.method == 'OPTIONS':
            logger.debug("Handling CORS preflight request")
            resp.status = falcon.HTTP_200
            return True  # Skip further processing
    
    def process_response(self, req, resp, resource, params):
        """
        Add standard headers to the response.
        
        Args:
            req: The request object.
            resp: The response object.
            resource: The resource object.
            params: The request parameters.
        """
        logger.debug("Adding standard headers to response")
        resp.set_header('X-Powered-By', 'OpenEventDatabase')
        
        # CORS headers - Configuration optimisée pour embed.js
        resp.set_header('Access-Control-Allow-Origin', '*')
        resp.set_header('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Authorization, Accept, Origin, User-Agent, Referer')
        resp.set_header('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS, HEAD')
        resp.set_header('Access-Control-Allow-Credentials', 'false')
        resp.set_header('Access-Control-Max-Age', '86400')  # 24 hours
        resp.set_header('Access-Control-Expose-Headers', 'Content-Length, Content-Type, Date, Server, X-Powered-By')
        
        # Headers supplémentaires pour embed.js
        resp.set_header('Vary', 'Origin')
        resp.set_header('Cache-Control', 'public, max-age=300')  # Cache de 5 minutes pour les requêtes embed