# coding=utf-8
from __future__ import unicode_literals
import os
import user
import uuid, random
from django.db import models
from django.conf import settings
# from django.contrib.contenttypes import generic
from django.utils.translation import ugettext as _
from django.contrib.auth.models import User
from django.utils import timezone
from jsonfield import JSONField
# from PIL import Image

# from sorl.thumbnail import ImageField, get_thumbnail

from eav.models import BaseEntity, BaseSchema, BaseAttribute, BaseChoice

from adim_project.utils.decorators import cache

__all__ = ('AOType', 'AOSchema', 'AOChoice', 'AOAttribute', 'AnObj', 'AnObjMembership')

# code from from uuid._random_getnode()
RANDOM_NODE = random.randrange(0, 1 << 48L) | 0x010000000000L

# Destination path for uploaded images, relative to MEDIA_ROOT
AO_IMAGES_PATH = 'ao_images'


class AOType(models.Model):
    name = models.CharField(max_length=128)
    title = models.CharField(max_length=512, blank=True, default="")

    class Meta:
        app_label = "adim"
        verbose_name = "Annotable Object Type"

    def __unicode__(self):
        if self.title:
            return u"{} ({})".format(self.title, self.name)
        else:
            return self.name


class AOSchema(BaseSchema):
    ao_types = models.ManyToManyField(AOType, blank=True)

    class Meta:
        app_label = "adim"
        verbose_name = "Annotable Object Schema"
        verbose_name_plural = "Annotable Object Schemata"

# AOSchema._meta.get_field_by_name('datatype')[0]._choices += (('image', u'image file'), )


class AOChoice(BaseChoice):
    schema = models.ForeignKey(AOSchema, related_name='choices')

    class Meta:
        app_label = "adim"
        verbose_name = "Annotable Object Choice"


class AOAttribute(BaseAttribute):
    schema = models.ForeignKey(AOSchema, related_name='attrs')
    choice = models.ForeignKey(AOChoice, blank=True, null=True)
    #
    value_image = models.ImageField(upload_to="ao", blank=True, null=True)

    class Meta:
        app_label = "adim"
        verbose_name = "Annotable Object Attribute"
        verbose_name_plural = "Annotable Object Attributes"


def get_image_path(instance, filename):
    now = timezone.now()
    instance.set_uuid()
    file_ext = os.path.splitext(filename)[1]
    filename = instance.uuid + file_ext
    return os.path.join(
        AO_IMAGES_PATH,
        now.strftime("%Y"),
        now.strftime("%m"),
        now.strftime("%d"),
        filename
    )


class AnObj(models.Model):
    """
    Annotable Object
    """
    uuid = models.CharField(max_length=32, unique=True, blank=True)

    name = models.CharField(max_length=125)
    owner = models.ForeignKey(User, verbose_name=_("owner"), related_name='anobjs')
    owners = models.ManyToManyField(User, verbose_name=_("owners"), related_name='owned_anobjs', blank=True)
    locked = models.BooleanField(verbose_name=_("locked"), default=False)

    sharing_mode = models.IntegerField(verbose_name=_("sharing mode"), default=0, blank=True)
    sharing_opts = JSONField(verbose_name=_("sharing options"), default="{}", blank=True)
    allow_public_publishing = models.BooleanField(verbose_name=_("allow public publishing"), default=False)
    members = models.ManyToManyField(User, verbose_name=_("members"), through='AnObjMembership',
                                     related_name='shared_anobjs', blank=True)

    image = models.ImageField(upload_to=get_image_path, verbose_name=_("image"), blank=True, null=True)
    image_url = models.CharField(max_length=512, verbose_name=_("image url"), blank=True, null=True, default="")

    _thumb_url = models.CharField(max_length=512, blank=True, null=True)

    # ----- eav attributes
    # ao_type = models.ForeignKey(AOType, verbose_name="type", blank=True, null=True)
    # attrs = generic.GenericRelation(AOAttribute, object_id_field='entity_id',
    #                                 content_type_field='entity_type')

    class Meta:
        app_label = "adim"
        verbose_name = "Annotable Object"
        ordering = ["-id"]

    def __unicode__(self):
        return u"{}".format(self.name)

    def save(self, *args, **kwargs):
        """
        Override save method to add actions on creation:
            caluclate the `uuid`
            append to `owner` to the `owners` list

        :param args:
        :param kwargs:
        :return:
        """
        new_anobj = False
        # set the uuid upon object creation
        if not self.uuid:
            self.set_uuid(no_save=True)
            new_anobj = True

        super(AnObj, self).save(*args, **kwargs)
        if new_anobj:
            if len(self.owners.all()) == 0:
                self.owners.add(self.owner)

    def set_uuid(self, no_save=False):
        """
        Calculate and set the UUID, only if not already set
        :param no_save:
        :return:
        """
        if not self.uuid:
            # Using the random node initialized at module level
            # to avoid compromising network address
            self.uuid = uuid.uuid1(node=RANDOM_NODE).hex
            if not no_save:
                self.save()

    def add_members(self, *args, **kwargs):
        """
        Add members through Membership, with specified publish mode
        """
        publish_mode = kwargs.get('publish_mode', 0)
        memberships = []
        for user in args:
            AnObjMembership.objects.get_or_create(anobj=self, user=user, defaults={'publish_mode': publish_mode})
        #
        #     memberships.append(AnObjMembership(anobj=self, user=user, publish_mode=publish_mode))
        # if memberships:
        #     AnObjMembership.objects.bulk_create(memberships)

    def remove_members(self, *args):
        """
        Remove members through Membership
        """
        AnObjMembership.objects.filter(anobj=self, user__in=args).delete()

    @cache(seconds=10)
    def is_owned(self, user_id):
        """
        Return True if the User if an owner of the anobj

        This is used as function, so the result can be cached
        """
        return user_id in self.owners.all().values_list('id', flat=True)

    # def _create_thumbnail(self):
    #     if not self.image:
    #         return
    #
    #     th_path = os.path.splitext(self.image.path)[0] + "__.png"
    #     if os.path.exists(th_path):
    #         return th_path
    #
    #     im = Image.open(self.image.path)
    #     im.thumbnail(settings.ADIM_THUMB_SIZE)
    #     im.save(th_path)
    #     return th_path

    @property
    def thumb_url(self):
        if not self._thumb_url:
            # th_size = (150, 150)
            # th_path = os.path.splitext(self.image.path)[0] + "__.png"
            # im = Image.open(self.image.path)
            # im.thumbnail(th_size)
            # im.save(th_path)
            # im = get_thumbnail(self.image.name, '150x150', quality=80)
            self._thumb_url = self._create_thumbnail()
            self.save()
        return self._thumb_url

    @thumb_url.setter
    def thumb_url(self, url):
        self._thumb_url = url

    # @classmethod
    # def get_schemata_for_model(cls):
    #     return AOSchema.objects.all()
    #
    # def get_schemata_for_instance(self, qs):
    #     qs = qs.filter(models.Q(ao_types__isnull=True) | models.Q(ao_types=self.ao_type))
    #     return qs


def clear_thumbnails(qs=None):
    if qs is None or qs.model is not AnObj:
        qs = AnObj.objects.all()
    qs.update(_thumb_url="")


PUBLISHING_MODES = (
    (0, _("private")),
    (1, _("owner only")),
    (2, _("all members"))
)


class AnObjMembership(models.Model):
    anobj = models.ForeignKey(AnObj)
    user = models.ForeignKey(User)
    publish_mode = models.IntegerField(choices=PUBLISHING_MODES, default=0)

    class Meta:
        app_label = "adim"
        verbose_name = "Annotable Object Membership"