import time

from django.conf import settings
from django.utils.cache import patch_vary_headers
from django.utils.http import cookie_date
from importlib import import_module


class SessionMiddleware(object):
    """
    Middleware that provides ip and user_agent to the session store.
    """
    def process_request(self, request):
        engine = import_module(settings.SESSION_ENGINE)
        session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME, None)
        request.session = engine.SessionStore(
            ip=request.META.get('REMOTE_ADDR', ''),
            user_agent=request.META.get('HTTP_USER_AGENT', ''),
            session_key=session_key
        )

    def process_response(self, request, response):
        """
        If request.session was modified, or if the configuration is to save the
        session every time, save the changes and set a session cookie.
        """
        try:
            accessed = request.session.accessed
            modified = request.session.modified
        except AttributeError:
            pass
        else:
            if accessed:
                patch_vary_headers(response, ('Cookie',))
            if modified or settings.SESSION_SAVE_EVERY_REQUEST:
                if request.session.get_expire_at_browser_close():
                    max_age = None
                    expires = None
                else:
                    max_age = request.session.get_expiry_age()
                    expires_time = time.time() + max_age
                    expires = cookie_date(expires_time)
                # Save the session data and refresh the client cookie.
                # Skip session save for 500 responses, refs #3881.
                if response.status_code != 500:
                    request.session.save()
                    response.set_cookie(
                        settings.SESSION_COOKIE_NAME,
                        request.session.session_key,
                        max_age=max_age,
                        expires=expires,
                        domain=settings.SESSION_COOKIE_DOMAIN,
                        path=settings.SESSION_COOKIE_PATH,
                        secure=settings.SESSION_COOKIE_SECURE or None,
                        httponly=settings.SESSION_COOKIE_HTTPONLY or None)
        return response