class UserSerializer(serializers.ModelSerializer):

    confirm_password = serializers.CharField(max_length=50, required=True, validators=[password_check], write_only=True)
    password = serializers.CharField(max_length=50, required=True, validators=[password_check])
    Id = serializers.CharField(max_length=100, required=False, allow_blank=True)
    user_type = serializers.CharField(max_length=30, required=True, write_only=True)
    email = serializers.EmailField(required=True)

    def validate_username(self, username):
        if User.objects.filter(username=username):
            raise serializers.ValidationError('Username already chosen!')

        if len(username) < 8:
            raise serializers.ValidationError('Username min length is 8')
        return username

    def validate_email(self, email):
        try:
            validate_email(email)
        except ValidationError:
            raise serializers.ValidationError('Enter a valid email')

        if User.objects.filter(email=email):
            raise serializers.ValidationError('Email already chosen!')
        return email

    def validate(self, attrs):
        key = 0
        try:
            if models.Profile.objects.filter(userid=attrs['Id']).exists() and attrs['Id'] != '':
                raise serializers.ValidationError('UserId already chosen')
            if attrs['Id'] == '':
                key=1
        except KeyError:
                key=1

        if key == 1:
            if attrs['user_type'] != 'Admin' and attrs['user_type'] != 'AdminCoordinate':
                raise serializers.ValidationError("UserId can't be empty!")
            else:
                attrs['user_id'] = ''

        if attrs['password'] != attrs['confirm_password']:
            raise serializers.ValidationError('Enter same passwords both the times!')
        return attrs

    class Meta:
        model = User
        fields = ('pk', 'username', 'password', 'email', 'confirm_password', 'Id', 'user_type')
        read_only_fields = ('pk',)