# -*- coding: utf-8 -*-
from __future__ import unicode_literals

import os
import uuid
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
from django.utils.text import slugify
from django.utils.translation import ugettext_lazy as _

from ..storages import ProtectedMediaAssetStorage

# TODO Define the central storage somewhere more central
originals_storage = ProtectedMediaAssetStorage()


# TODO Move this to special FileField class
def get_upload_path(instance, filename):
    """
    Returns /<uuid_hex>/original/<slugified_filename.ext>
    where
        - uuid is taken from instance,
        - filename is slugified and shortened to a max length of 255 characters including the extension.
    """
    MAX_LENGTH = 255
    name, ext = os.path.splitext(filename)
    name = slugify(name)
    name = name[:(MAX_LENGTH - len(ext))]
    filename = "%s%s" % (name, ext)
    return os.path.join(instance.get_uuid(), instance.storage.ORIGINAL_FILE_PREFIX, filename)


@python_2_unicode_compatible
class MediaAsset(models.Model):
    uuid_hex = models.CharField(max_length=32, null=False, editable=False)
    original_file = models.FileField(upload_to=get_upload_path,
                                     storage=originals_storage
                                     )
    name = models.CharField(_('name'), max_length=50)

    def __str__(self):
        return self.name

    # TODO Make auto-initialized UUID-field
    def get_uuid(self):
        if not self.uuid_hex:
            self.uuid_hex = uuid.uuid4().hex
        return uuid.UUID(self.uuid_hex)