# -*- coding: utf-8 -*-
from __future__ import unicode_literals
# Erik Stein <code@classlibrary.net>, 2016


from imagekit.models.fields.utils import ImageSpecFileDescriptor
from imagekit.models.fields import ImageSpecField
from ..files.storage import MediaAssetFileSystemStorage
from ...cachefiles import MediaAssetCacheFile


class MediaAssetCacheFileDescriptor(ImageSpecFileDescriptor):
    """
    - Manages manually overriden cached files
    - knows to handle ConversionNotApplicable exceptions and
      provides svg-icons for this case

    """

    def __init__(self, field, attname, source_field_name):
        self.attname = attname
        self.field = field
        self.source_field_name = source_field_name

    def __get__(self, instance, owner):
        if instance is None:
            return self.field
        else:
            source = getattr(instance, self.source_field_name)
            spec = self.field.get_spec(source=source)
            file = MediaAssetCacheFile(spec)
            instance.__dict__[self.attname] = file
            return file

    def __set__(self, instance, value):
        instance.__dict__[self.attname] = value


class MediaAssetFileField(ImageSpecField):
    """
    - default storage
    """

    def __init__(self, storage=MediaAssetFileSystemStorage):
        pass