"""Common account serializers"""
from fcm_django.models import FCMDevice
from rest_framework import serializers, exceptions

from account import models
from utils import exceptions as utils_exceptions
from rest_framework_simplejwt import tokens
from django.conf import settings
from account import tasks


# User serializers
class UserSerializer(serializers.ModelSerializer):
    """User serializer."""
    class Meta:
        model = models.User
        fields = [
            'first_name',
            'last_name',
        ]


# Firebase Cloud Messaging serializers
class FCMDeviceSerializer(serializers.ModelSerializer):
    """FCM Device model serializer"""
    class Meta:
        model = FCMDevice
        fields = ('id', 'name', 'registration_id', 'device_id',
                  'active', 'date_created', 'type')
        read_only_fields = ('id', 'date_created',)
        extra_kwargs = {'active': {'default': True}}

    def validate(self, attrs):
        regid = attrs.get('registration_id')
        dtype = attrs.get('type')
        if regid and dtype and self.Meta.model.objects.filter(
                registration_id=regid).exclude(type=dtype).count():
            raise exceptions.ValidationError(
                {'registration_id': 'This field must be unique.'})
        return attrs

    def __init__(self, *args, **kwargs):
        super(FCMDeviceSerializer, self).__init__(*args, **kwargs)
        self.fields['type'].help_text = (
            'Should be one of ["%s"]' %
            '", "'.join([i for i in self.fields['type'].choices]))

    def create(self, validated_data):
        user = self.context['request'].user
        if not user.is_anonymous:
            validated_data['user'] = user
        device = FCMDevice.objects.create(**validated_data)
        return device

    def update(self, instance, validated_data):

        user = self.context['request'].user
        if not user.is_anonymous:
            instance.user = user
            instance.save()
        else:
            instance.user = None
            instance.save()
        return instance


class RefreshTokenSerializer(serializers.Serializer):
    """Serializer for refresh token view"""
    refresh_token = serializers.CharField(read_only=True)
    access_token = serializers.CharField(read_only=True)

    def get_request(self):
        """Return request"""
        return self.context.get('request')

    def validate(self, attrs):
        """Override validate method"""
        refresh_token = self.get_request().COOKIES.get('refresh_token')
        if not refresh_token:
            raise utils_exceptions.NotValidRefreshTokenError()

        token = tokens.RefreshToken(token=refresh_token)

        data = {'access_token': str(token.access_token)}

        if settings.SIMPLE_JWT.get('ROTATE_REFRESH_TOKENS'):
            if settings.SIMPLE_JWT.get('BLACKLIST_AFTER_ROTATION'):
                try:
                    # Attempt to blacklist the given refresh token
                    token.blacklist()
                except AttributeError:
                    # If blacklist app not installed, `blacklist` method will
                    # not be present
                    pass

            token.set_jti()
            token.set_exp()

            data['refresh_token'] = str(token)

        return data


class ChangeEmailSerializer(serializers.ModelSerializer):
    """Change user email serializer"""

    class Meta:
        """Meta class"""
        model = models.User
        fields = (
            'id',
            'email',
        )
        read_only_fields = (
            'id',
        )

    def validate_email(self, value):
        """Validate email value"""
        if value == self.instance.email:
            # todo: added custom exception
            raise serializers.ValidationError()
        return value

    def validate(self, attrs):
        """Override validate method"""
        email_confirmed = self.instance.email_confirmed
        if not email_confirmed:
            # todo: added custom exception
            raise serializers.ValidationError()
        return attrs

    def update(self, instance, validated_data):
        """
        Override update method
        """
        instance.email = validated_data.get('email')
        instance.email_confirmed = False
        instance.save()
        # Send verification link on user email for change email address
        if settings.USE_CELERY:
            tasks.confirm_new_email_address.delay(instance.id)
        else:
            tasks.confirm_new_email_address(instance.id)
        return instance