from django.urls import reverse
from rest_framework import serializers

from ..models import Attachment

__all__ = ["AttachmentSerializer"]


class AttachmentSerializer(serializers.ModelSerializer):
    post = serializers.PrimaryKeyRelatedField(read_only=True)

    acl = serializers.SerializerMethodField()
    is_image = serializers.SerializerMethodField()
    filetype = serializers.SerializerMethodField()

    url = serializers.SerializerMethodField()

    class Meta:
        model = Attachment
        fields = [
            "id",
            "filetype",
            "post",
            "uploaded_on",
            "uploader_name",
            "filename",
            "size",
            "acl",
            "is_image",
            "url",
        ]

    def get_acl(self, obj):
        try:
            return obj.acl
        except AttributeError:
            return None

    def get_is_image(self, obj):
        return obj.is_image

    def get_filetype(self, obj):
        return obj.filetype.name

    def get_url(self, obj):
        return {
            "index": obj.get_absolute_url(),
            "thumb": obj.get_thumbnail_url(),
            "uploader": self.get_uploader_url(obj),
        }

    def get_uploader_url(self, obj):
        if obj.uploader_id:
            return reverse(
                "misago:user", kwargs={"slug": obj.uploader_slug, "pk": obj.uploader_id}
            )
        else:
            return None