from django import forms
from django.utils.translation import gettext_lazy as _

from . import models


class MediaCategoryAdminForm(forms.ModelForm):
    class Meta:
        model = models.MediaCategory
        fields = '__all__'

    def clean_parent(self):
        data = self.cleaned_data['parent']
        if data is not None and self.instance in data.path_list():
            raise forms.ValidationError(
                _("This would create a loop in the hierarchy"))
        return data

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['parent'].queryset =\
            self.fields['parent'].queryset.exclude(pk=self.instance.pk)


# TODO
# class MediaFileAdminForm(forms.ModelForm):
#     class Meta:
#         model = MediaFile
#         widgets = {'file': AdminFileWithPreviewWidget}
#         fields = '__all__'

#     def __init__(self, *args, **kwargs):
#         super(MediaFileAdminForm, self).__init__(*args, **kwargs)

#         if settings.FEINCMS_MEDIAFILE_OVERWRITE and self.instance.id:
#             field = self.instance.file.field
#             if not hasattr(field, '_feincms_generate_filename_patched'):
#                 original_generate = field.generate_filename

#                 def _gen_fname(instance, filename):
#                     if instance.id and hasattr(instance, 'original_name'):
#                         logger.info("Overwriting file %s with new data" % (
#                             instance.original_name))
#                         instance.file.storage.delete(instance.original_name)
#                         return instance.original_name

#                     return original_generate(instance, filename)

#                 field.generate_filename = _gen_fname
#                 field._feincms_generate_filename_patched = True

#     def clean_file(self):
#         if settings.FEINCMS_MEDIAFILE_OVERWRITE and self.instance.id:
#             new_base, new_ext = os.path.splitext(
#                 self.cleaned_data['file'].name)
#             old_base, old_ext = os.path.splitext(self.instance.file.name)

#             if new_ext.lower() != old_ext.lower():
#                 raise forms.ValidationError(_(
#                     "Cannot overwrite with different file type (attempt to"
#                     " overwrite a %(old_ext)s with a %(new_ext)s)"
#                 ) % {'old_ext': old_ext, 'new_ext': new_ext})

#             self.instance.original_name = self.instance.file.name

#         return self.cleaned_data['file']