from rest_framework.authentication import TokenAuthentication
from rest_framework.exceptions import AuthenticationFailed
import logging

logger = logging.getLogger(__name__)

class DebugTokenAuthentication(TokenAuthentication):
    """
    Extended TokenAuthentication with detailed logging for debugging
    """
    def authenticate(self, request):
        auth_header = request.META.get('HTTP_AUTHORIZATION', '')
        logger.info(f"🔍 AUTH DEBUG - Header: {auth_header}")
        
        # Check if header exists
        if not auth_header:
            logger.warning("🔴 AUTH DEBUG - No Authorization header found")
            return None
        
        # Extract token
        parts = auth_header.split()
        if len(parts) != 2 or parts[0].lower() != 'token':
            logger.warning(f"🔴 AUTH DEBUG - Invalid header format: {parts}")
            return None
        
        token_key = parts[1]
        logger.info(f"🔍 AUTH DEBUG - Token key extracted: {token_key[:10]}...")
        
        try:
            # Try to get token from database
            from rest_framework.authtoken.models import Token
            token = Token.objects.select_related('user').get(key=token_key)
            logger.info(f"✅ AUTH DEBUG - Token found in DB")
            logger.info(f"✅ AUTH DEBUG - User: {token.user}")
            logger.info(f"✅ AUTH DEBUG - User ID: {token.user.id}")
            logger.info(f"✅ AUTH DEBUG - User is_active: {token.user.is_active}")
            logger.info(f"✅ AUTH DEBUG - User is_authenticated: {token.user.is_authenticated}")
            
            if not token.user.is_active:
                logger.error("🔴 AUTH DEBUG - User is not active")
                raise AuthenticationFailed('User inactive or deleted.')
            
            logger.info("✅ AUTH DEBUG - Authentication SUCCESSFUL")
            return (token.user, token)
            
        except Exception as e:
            logger.error(f"🔴 AUTH DEBUG - Token lookup failed: {str(e)}")
            raise AuthenticationFailed('Invalid token.')