from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
from django.db.models import Count, Q
from tastypie import fields
from tastypie.authentication import Authentication, BasicAuthentication
from tastypie.authorization import DjangoAuthorization, Authorization
from django.conf.urls import url
from tastypie.constants import ALL
from tastypie.http import HttpGone, HttpMultipleChoices
from tastypie.utils import trailing_slash

from spa.api.v1.BackboneCompatibleResource import BackboneCompatibleResource
from spa.models.activity import ActivityFollow
from spa.models.userprofile import UserProfile
from spa.models.mix import Mix


class UserResource(BackboneCompatibleResource):
    followers = fields.ToManyField(to='self', attribute='followers',
                                   related_name='followers', null=True)

    class Meta:
        queryset = UserProfile.objects.all().annotate(mix_count=Count('mixes')).order_by('-mix_count')
        favourites = fields.ToManyField('spa.api.v1.MixResource.MixResource', 'favourites', null=True)
        resource_name = 'user'
        excludes = ['is_active', 'is_staff', 'is_superuser', 'password']
        ordering = ['mix_count']
        filtering = {
            'slug': ALL,
        }
        authorization = Authorization()
        authentication = Authentication()
        favourites = fields.ToManyField('spa.api.v1.MixResource', 'favourites')

    def _hydrateBitmapOption(self, source, comparator):
        return True if (source & comparator) != 0 else False

    def prepend_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/(?P<slug>[\w\d_.-]+)/favourites%s$" % (
                self._meta.resource_name, trailing_slash()),
                self.wrap_view('get_user_favourites'), name="api_get_user_favourites"),
            url(r"^(?P<resource_name>%s)/(?P<pk>\d+)/$" % self._meta.resource_name,
                self.wrap_view('dispatch_detail'), name="api_dispatch_detail"),
            url(r"^(?P<resource_name>%s)/(?P<slug>[\w\d_.-]+)/$" % self._meta.resource_name,
                self.wrap_view('dispatch_detail'), name="api_dispatch_detail"),
            url(r"^(?P<resource_name>%s)/(?P<pk>\w[\w/-]*)/followers%s$" % (self._meta.resource_name, trailing_slash()),
                self.wrap_view('get_followers'), name="api_get_followers"),
        ]

    def apply_filters(self, request, applicable_filters):
        semi_filtered = super(UserResource, self).apply_filters(request, applicable_filters)
        return semi_filtered

    def __apply_filters(self, request, applicable_filters):
        semi_filtered = super(UserResource, self).apply_filters(request, applicable_filters)
        q = request.GET.get('q', None)
        if q is not None:
            semi_filtered = semi_filtered.filter(
                Q(user__first_name__icontains=q) |
                Q(user__last_name__icontains=q) |
                Q(display_name__icontains=q)
            )

        return semi_filtered

    def _patch_resource(self, bundle):
        #Handle the patched items from backbone
        if 'following' in bundle.data:
            if bundle.data['following']:
                bundle.obj.add_follower(bundle.request.user.get_profile())
                activity = ActivityFollow()
                activity.user = bundle.request.user.get_profile()
                activity.to_user = bundle.obj
                activity.save()
            else:
                bundle.obj.remove_follower(bundle.request.user.get_profile())

    def obj_update(self, bundle, skip_errors=False, **kwargs):

        """
            This feels extremely hacky - but for some reason, deleting from the bundle
            in hydrate is not preventing the fields from being serialized at the ORM
        """
        if 'activity_sharing_networks_facebook' in kwargs: del kwargs['activity_sharing_networks_facebook']
        if 'activity_sharing_networks_twitter' in kwargs: del kwargs['activity_sharing_networks_twitter']
        if 'activity_sharing_likes' in kwargs: del kwargs['activity_sharing_likes']
        if 'activity_sharing_favourites' in kwargs: del kwargs['activity_sharing_favourites']
        if 'activity_sharing_comments' in kwargs: del kwargs['activity_sharing_comments']

        #need to figure out why this is excepting, granted I shouldn't be
        #trying to update followers in here but still though.
        try:
            self._patch_resource(bundle)
        except:
            pass

        return super(UserResource, self).obj_update(bundle, skip_errors, **kwargs)

    def dehydrate_description(self, bundle):
        return bundle.obj.get_profile_description()

    def dehydrate(self, bundle):
        del bundle.data['activity_sharing']
        del bundle.data['activity_sharing_networks']
        bundle.data['display_name'] = bundle.obj.get_nice_name()
        bundle.data['avatar_image'] = bundle.obj.get_avatar_image()
        if bundle.obj.user.id == bundle.request.user.id:
            bundle.data['email'] = bundle.obj.email
            bundle.data['first_name'] = bundle.obj.first_name
            bundle.data['last_name'] = bundle.obj.last_name
            bundle.data['activity_sharing_likes'] = \
                self._hydrateBitmapOption(bundle.obj.activity_sharing, UserProfile.ACTIVITY_SHARE_LIKES)
            bundle.data['activity_sharing_favourites'] = \
                self._hydrateBitmapOption(bundle.obj.activity_sharing, UserProfile.ACTIVITY_SHARE_FAVOURITES)
            bundle.data['activity_sharing_comments'] = \
                self._hydrateBitmapOption(bundle.obj.activity_sharing, UserProfile.ACTIVITY_SHARE_COMMENTS)

            bundle.data['activity_sharing_networks_facebook'] = \
                self._hydrateBitmapOption(bundle.obj.activity_sharing_networks,
                                          UserProfile.ACTIVITY_SHARE_NETWORK_FACEBOOK)
            bundle.data['activity_sharing_networks_twitter'] = \
                self._hydrateBitmapOption(bundle.obj.activity_sharing_networks,
                                          UserProfile.ACTIVITY_SHARE_NETWORK_TWITTER)

        bundle.data['like_count'] = Mix.objects.filter(likes__user=bundle.obj).count()
        bundle.data['favourite_count'] = Mix.objects.filter(favourites__user=bundle.obj).count()
        bundle.data['follower_count'] = bundle.obj.followers.count()
        bundle.data['following_count'] = bundle.obj.following.count()
        bundle.data['following'] = bundle.obj.is_follower(bundle.request.user)
        bundle.data['url'] = bundle.obj.get_profile_url()
        bundle.data['date_joined'] = bundle.obj.user.date_joined
        bundle.data['last_login'] = bundle.obj.user.last_login
        bundle.data['mix_count'] = bundle.obj.mix_count

        return bundle

    def hydrate(self, bundle):
        if 'activity_sharing_likes' in bundle.data:
            likes = UserProfile.ACTIVITY_SHARE_LIKES if bundle.data['activity_sharing_likes'] else 0
            favourites = UserProfile.ACTIVITY_SHARE_FAVOURITES if bundle.data['activity_sharing_favourites'] else 0
            comments = UserProfile.ACTIVITY_SHARE_COMMENTS if bundle.data['activity_sharing_comments'] else 0
            bundle.data['activity_sharing'] = (likes | favourites | comments)
            del bundle.data['activity_sharing_likes']
            del bundle.data['activity_sharing_favourites']
            del bundle.data['activity_sharing_comments']

        if 'activity_sharing_networks_facebook' in bundle.data:
            facebook = UserProfile.ACTIVITY_SHARE_NETWORK_FACEBOOK if bundle.data[
                'activity_sharing_networks_facebook'] else 0
            twitter = UserProfile.ACTIVITY_SHARE_NETWORK_TWITTER if bundle.data[
                'activity_sharing_networks_twitter'] else 0
            bundle.data['activity_sharing_networks'] = (facebook | twitter)
            del bundle.data['activity_sharing_networks_facebook']
            del bundle.data['activity_sharing_networks_twitter']

        return bundle

    def get_followers(self, request, **kwargs):
        try:
            basic_bundle = self.build_bundle(request=request)
            obj = self.cached_obj_get(bundle=basic_bundle, **self.remove_api_resource_names(kwargs))
        except ObjectDoesNotExist:
            return HttpGone()
        except MultipleObjectsReturned:
            return HttpMultipleChoices("More than one resource is found at this URI.")

        child_resource = UserResource()
        return child_resource.get_list(request, mix=obj)