from django.db.transaction import atomic
from rest_framework import serializers

from apps.users.serializers import PublicUserSerializer
from .models import Transaction


class TransactionSerializer(serializers.ModelSerializer):
    payer = PublicUserSerializer(required=False)
    payee = PublicUserSerializer(required=False, read_only=True)
    # application_client_id = serializers.IntegerField(required=False, read_only=True)

    class Meta:
        model = Transaction
        fields = ('uuid',
                  'payer',
                  'payee',
                  "create",
                  "state",
                  'amount',
                  'delay',
                  'last_update',
                  'detail_id',
                  # 'application_client_id'
                  )

        read_only_fields = ['uuid', 'last_update', 'state', 'create', 'detail_id']  #, 'application_client_id']

    def create(self, validated_data):

        payer = validated_data.get('payer')
        request = self.context.get('request')
        user = request.user if request else payer

        if user == payer:
            with atomic():
                transaction = Transaction.objects.create_transaction(**validated_data)
                transaction.pay()

        else:
            transaction = Transaction.objects.create_transaction(**validated_data)

        return transaction