import json

from graphql import (
    GraphQLArgument,
    GraphQLField,
    GraphQLInputField,
    GraphQLInputObjectType,
    GraphQLInt,
    GraphQLObjectType,
    GraphQLSchema,
    GraphQLString,
)

nestedInput = GraphQLInputObjectType(
    "Nested",
    description="The input object that has a field pointing to itself",
    fields={"foo": GraphQLInputField(GraphQLInt, description="foo")},
)

nestedInput.fields["child"] = GraphQLInputField(nestedInput, description="child")

queryType = GraphQLObjectType(
    "Query",
    fields=lambda: {
        "echo": GraphQLField(
            args={"nested": GraphQLArgument(type_=nestedInput)},
            resolve=lambda *args, **kwargs: json.dumps(kwargs["nested"]),
            type_=GraphQLString,
        ),
    },
)

NestedInputSchema = GraphQLSchema(
    query=queryType,
    types=[nestedInput],
)