import json
import logging

from django.http import HttpResponse

logger = logging.getLogger(__name__)


def _return_response(response_dict, status=200):
	response = json.dumps(response_dict)
	return HttpResponse(response, status=status, content_type="application/javascript")


def _return_error_response(error):
	response_dict = {'error': error}
	return _return_response(response_dict, status=400)


def api_request_decorator(request_type):
	assert request_type in ('GET', 'POST'), "Invalid request_type specified"

	def inner_decorator(func):
		def inner(request, *args, **kwargs):
			try:
				if request.method != request_type:
					raise Exception('request type %s required for this method' % request_type)
				return _return_response(func(request, *args, **kwargs))
			except Exception, e:
				logger.error("Exception caught in API request: %s" % e)
			return _return_error_response(e.message)
		return inner

	return inner_decorator