import logging

from tastypie import fields
from tastypie.constants import ALL, ALL_WITH_RELATIONS
from tastypie.resources import ModelResource, Resource, Bundle
from tastypie.utils import trailing_slash
from tastypie.authentication import ApiKeyAuthentication, Authentication
from tastypie.exceptions import BadRequest

from django.conf.urls import url
from django.contrib import auth
from django.contrib.auth.models import User
from django.core.urlresolvers import reverse

from regluit.core import models
import regluit.core.isbn

logger = logging.getLogger(__name__)


class EditionResource(ModelResource):
    work = fields.ForeignKey('regluit.api.resources.WorkResource', 'work')
    identifiers = fields.ToManyField('regluit.api.resources.IdentifierResource', 'identifiers')
    ebooks = fields.ToManyField('regluit.api.resources.EbookResource', 'ebooks')
    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Edition.objects.all()
        resource_name = 'edition'
        filtering = {
            "isbn_13": ALL, "identifiers": ALL_WITH_RELATIONS, 
        }
    
    def build_filters(self, filters = None, **kwargs):
        if filters is None:
            filters = {}
        for filter_expr, value in filters.items():
            if filter_expr.startswith('isbn_13'):
                filters['identifiers__type'] = 'isbn'
                if len(filter_expr)>7:
                    filters['identifiers__value'+filter_expr[7:]] = value
                else:
                    filters['identifiers__value'] = value
                del filters[ filter_expr ]
        return super(EditionResource, self).build_filters(filters)

class IdentifierResource(ModelResource):
    work = fields.ForeignKey('regluit.api.resources.WorkResource', 'work')
    edition = fields.ForeignKey('regluit.api.resources.EditionResource', 'edition')
    
    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Identifier.objects.all()
        resource_name = 'identifier'
        filtering = {
            "value": ALL, "type" : ALL,
        }
    

  
class WorkResource(ModelResource):
    editions = fields.ToManyField(EditionResource, 'editions')
    identifiers = fields.ToManyField(IdentifierResource, 'identifiers')

    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Work.objects.all()
        resource_name = 'work'
        filtering = {'editions': ALL_WITH_RELATIONS, 'id': ALL, 'identifiers': ALL_WITH_RELATIONS}
        ordering = ['num_wishes']
    
class CampaignResource(ModelResource):
    work = fields.ToOneField(WorkResource, 'work')

    def alter_list_data_to_serialize(self, request, data):
        """
        annotate the list of campaigns with information from the logged in
        user. note: this isn't the user identified by the api username/api_key 
        it's the the user that client might be logged into unglue.it as.
        """
        u = auth.get_user(request)
        if isinstance(u, User):
            data['meta']['logged_in_username'] = u.username
            wishlist_work_ids = [w.id for w in u.wishlist.works.all()]
        else:
            data['meta']['logged_in_username'] = None
            wishlist_work_ids = []

        for o in data['objects']:
            o.data['in_wishlist'] = o.obj.work.id in wishlist_work_ids
            # there's probably a better place up the chain (where the Campaign objects are directly available) to grab the status
            c = models.Campaign.objects.get(id=o.data["id"])
            o.data['status'] = c.status
            o.data['current_total'] = c.current_total

        # TODO: add pledging information
        return data
    
    def alter_detail_data_to_serialize(self, request, obj):
        c = models.Campaign.objects.get(id=obj.data["id"])
        obj.data['status'] = c.status
        obj.data['current_total'] = c.current_total
        return obj

    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Campaign.objects.all()
        resource_name = 'campaign'
        excludes = ['amazon_receiver', 'paypal_receiver']
        filtering = {
            "work": ALL_WITH_RELATIONS,
        }

class AuthorResource(ModelResource):
    works = fields.ToManyField(WorkResource, 'works')
    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Author.objects.all()
        resource_name = 'author'

class SubjectResource(ModelResource):
    works = fields.ToManyField(WorkResource, 'works')
    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Subject.objects.all()
        resource_name = 'subject'

class EbookResource(ModelResource):
    edition = fields.ToOneField(EditionResource, 'edition')
    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Ebook.objects.all()
        resource_name = 'ebook'
        excludes = ['url']

class PublisherResource(ModelResource):
    ebooks = fields.ToManyField(EbookResource, attribute=lambda bundle: models.Ebook.objects.filter(edition__publisher_name=bundle.obj.name))
    class Meta:
        authentication = ApiKeyAuthentication()
        queryset = models.Publisher.objects.all()
        resource_name = 'publisher'

class FreeResource(ModelResource):
    def alter_list_data_to_serialize(self, request, data):
        del data["meta"]["limit"]
        del data["meta"]["offset"]
        return data
    
    def dehydrate(self, bundle):
        bundle.data["filetype"]=bundle.obj.format
        bundle.data["rights"]=bundle.obj.rights
        bundle.data["provider"]=bundle.obj.provider
        bundle.data["href"]=reverse('download_ebook',kwargs={'ebook_id':bundle.obj.id})
        return bundle
        
    def obj_get_list(self, bundle, **kwargs):
        request = bundle.request
        isbn =""
        if hasattr(request, 'GET'):
            isbn = request.GET.get("isbn","")
        isbn = isbn.replace('-','')
        if len(isbn)==10:
            isbn=regluit.core.isbn.convert_10_to_13(isbn)
        try:
            work=models.Identifier.objects.get(type='isbn',value=isbn,).work
            base_object_list = models.Ebook.objects.filter(edition__work=work)
            return base_object_list
        except ValueError:
            raise BadRequest("Invalid resource lookup data provided (mismatched type).")
        except models.Identifier.DoesNotExist:
            return  models.Ebook.objects.none()

    class Meta:
        authentication = ApiKeyAuthentication()
        fields = [ 'provider', 'rights' ]
        limit = 0
        include_resource_uri = False