from tastypie.resources import ModelResource, ALL_WITH_RELATIONS
from django.contrib.auth.models import User
from snipts.models import Comment, Snipt
from tastypie.cache import SimpleCache
from django.db.models import Count
from tastypie import fields
from taggit.models import Tag


class PublicUserResource(ModelResource):
    class Meta:
        queryset = User.objects.all()
        resource_name = 'user'
        fields = ['username',]
        include_absolute_url = True
        allowed_methods = ['get']
        list_allowed_methods = []
        cache = SimpleCache()

    def dehydrate(self, bundle):
        bundle.data['snipts'] = '/api/public/snipt/?user=%d' % bundle.obj.id
        return bundle

class PublicTagResource(ModelResource):
    class Meta:
        queryset = Tag.objects.filter(snipt__public=True)
        queryset = queryset.annotate(count=Count('taggit_taggeditem_items__id'))
        queryset = queryset.order_by('-count')
        resource_name = 'tag'
        fields = ['name',]
        allowed_methods = ['get']
        cache = SimpleCache()

    def dehydrate(self, bundle):
        bundle.data['absolute_url'] = '/public/tag/%s/' % bundle.obj.slug
        bundle.data['snipts'] = '/api/public/snipt/?tag=%d' % bundle.obj.id
        bundle.data['count'] = bundle.obj.taggit_taggeditem_items.filter(
                               snipt__public=True).count()
        return bundle

class PublicCommentResource(ModelResource):
    user = fields.ForeignKey(PublicUserResource, 'user')
    snipt = fields.ForeignKey('snipts.api.PublicSniptResource', 'snipt')

    class Meta:
        queryset = Comment.objects.filter(snipt__public=True).order_by('-created')
        resource_name = 'comment'
        fields = ['user', 'snipt', 'comment', 'created', 'modified',]
        include_absolute_url = True
        allowed_methods = ['get']
        cache = SimpleCache()

class PublicSniptResource(ModelResource):
    user = fields.ForeignKey(PublicUserResource, 'user', full=True)
    tags = fields.ToManyField(PublicTagResource, 'tags', related_name='tag', full=True)
    comments = fields.ToManyField(PublicCommentResource, 'comment_set',
                                  related_name='comment', full=True)

    class Meta:
        queryset = Snipt.objects.filter(public=True).order_by('-created')
        resource_name = 'snipt'
        fields = ['title', 'slug', 'lexer', 'code', 'created', 'modified',]
        include_absolute_url = True
        allowed_methods = ['get']
        filtering = { 'user': 'exact', }
        cache = SimpleCache()

    def dehydrate(self, bundle):
        bundle.data['embed_url'] = bundle.obj.get_embed_url()
        bundle.data['stylized'] = bundle.obj.get_stylized()
        return bundle

    def build_filters(self, filters=None):
        if filters is None:
            filters = {}

        orm_filters = super(PublicSniptResource, self).build_filters(filters)

        if 'tag' in filters:
            tag = Tag.objects.get(pk=filters['tag'])
            tagged_items = tag.taggit_taggeditem_items.all()
            orm_filters['pk__in'] = [i.object_id for i in tagged_items]

        return orm_filters