import json
from accept_types import get_best_match
from django.conf import settings
from django.http import HttpResponse
from os.path import join
from types import SimpleNamespace
from urllib.parse import urlencode

cache = SimpleNamespace(package_json=None)


def load_package_json():
    if cache.package_json:
        return cache.package_json
    with open(join(settings.BASE_DIR, 'package.json')) as f:
        cache.package_json = json.load(f)
    return cache.package_json


def origin(request):
    return '{0}://{1}'.format(request.scheme, request.site.domain)


def uri(request):
    return origin(request) + request.path


def choose_type(request, content, reps):
    type = get_best_match(request.META.get('HTTP_ACCEPT'), reps.keys())
    if type:
        return reps[type](content)
    return HttpResponse(status=406)


def form_encoded_response(content):
    return HttpResponse(
        urlencode(content),
        content_type='application/x-www-form-urlencoded'
    )