from django.shortcuts import redirect
from eventplanner_gcal.google_sync import sync_from_google_to_local, sync_from_local_to_google
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
from eventplanner_gcal.google_sync import check_if_google_callback_is_valid
from eventplanner_gcal.models import UserGCalCoupling
from django.shortcuts import render

import logging

logger = logging.getLogger(__name__)


def run_sync(request):
    sync_from_local_to_google()
    return redirect("/")


def manage(request):
    if request.method == 'POST':
        if request.POST['activate'] == "1":
            UserGCalCoupling.objects.filter(user=request.user).delete()
            c = UserGCalCoupling(user=request.user, email=request.POST['email'])
            c.save()
            sync_from_local_to_google()
        else:
            UserGCalCoupling.objects.filter(user=request.user).delete()
            sync_from_local_to_google()

    context = {}
    user_coupling = UserGCalCoupling.objects.filter(user=request.user)
    context['enabled'] = len(user_coupling)
    assert (len(user_coupling) < 2)
    if len(user_coupling) == 1:
        context['mail'] = user_coupling[0].email

    return render(request, 'eventplanner_gcal/management.html', context)


@csrf_exempt
def gcal_api_callback(request):
    token = ""
    if 'HTTP_X_GOOG_CHANNEL_TOKEN' in request.META:
        token = request.META['HTTP_X_GOOG_CHANNEL_TOKEN']

    channel_id = ""
    if 'HTTP_X_GOOG_CHANNEL_ID' in request.META:
        channel_id = request.META['HTTP_X_GOOG_CHANNEL_ID']

    resource_id = ""
    if 'HTTP_X_GOOG_RESOURCE_ID' in request.META:
        resource_id = request.META['HTTP_X_GOOG_RESOURCE_ID']

    valid = check_if_google_callback_is_valid(token, channel_id, resource_id)

    if not valid:
        return HttpResponse('<h1>Old Channel - no update triggered</h1>')

    logger.info("Received Google Callback with the following headers Token: "
                "%s ID %s ResID %s " % (token, channel_id, resource_id))
    result = sync_from_google_to_local()
    logger.info("Finished processing callback from GCal - New Information present: %d " % (result,))
    return HttpResponse('<h1>Callback successful</h1>')