from rest_framework import serializers
from .models import Nomenclature, Sticker, StickerMovement
from datetime import date


class NomenclatureSerializer(serializers.ModelSerializer):
    class Meta:
        model = Nomenclature
        fields = '__all__'

class StickerSerializer(serializers.ModelSerializer):
    is_expired = serializers.SerializerMethodField()
    is_expiring_soon = serializers.SerializerMethodField()
    nomenclature_name = serializers.CharField(source="nomenclature.name", read_only=True)
    nomenclature_gtin = serializers.CharField(source="nomenclature.gtin", read_only=True)
    class Meta:
        model = Sticker
        fields = '__all__'

    def get_is_expired(self, obj):
        return obj.is_expired()

    def get_is_expiring_soon(self, obj):
        return obj.is_expiring_soon()

    def to_representation(self, instance):
        """Обновляем статус при каждом запросе"""
        instance.save()
        return super().to_representation(instance)

class StickerMovementSerializer(serializers.ModelSerializer):
    class Meta:
        model = StickerMovement
        fields = '__all__'