from typing import Optional, overload

from ..language import (
    TypeNode, NamedTypeNode, ListTypeNode, NonNullTypeNode)
from ..type import (
    GraphQLType, GraphQLSchema, GraphQLNamedType, GraphQLList, GraphQLNonNull)

__all__ = ['type_from_ast']


@overload
def type_from_ast(schema: GraphQLSchema,
                  type_node: NamedTypeNode) -> Optional[GraphQLNamedType]:
    ...


@overload  # noqa: F811 (pycqa/flake8#423)
def type_from_ast(schema: GraphQLSchema,
                  type_node: ListTypeNode) -> Optional[GraphQLList]:
    ...


@overload  # noqa: F811
def type_from_ast(schema: GraphQLSchema,
                  type_node: NonNullTypeNode) -> Optional[GraphQLNonNull]:
    ...


@overload  # noqa: F811
def type_from_ast(schema: GraphQLSchema,
                  type_node: TypeNode) -> Optional[GraphQLType]:
    ...


def type_from_ast(schema, type_node):  # noqa: F811
    """Get the GraphQL type definition from an AST node.

    Given a Schema and an AST node describing a type, return a GraphQLType
    definition which applies to that type. For example, if provided the parsed
    AST node for `[User]`, a GraphQLList instance will be returned, containing
    the type called "User" found in the schema. If a type called "User" is not
    found in the schema, then None will be returned.
    """
    if isinstance(type_node, ListTypeNode):
        inner_type = type_from_ast(schema, type_node.type)
        return GraphQLList(inner_type) if inner_type else None
    if isinstance(type_node, NonNullTypeNode):
        inner_type = type_from_ast(schema, type_node.type)
        return GraphQLNonNull(inner_type) if inner_type else None
    if isinstance(type_node, NamedTypeNode):
        return schema.get_type(type_node.name.value)
    raise TypeError(f'Unexpected type kind: {type_node.kind}')

from typing import Optional, overload

from ..language import (
    TypeNode, NamedTypeNode, ListTypeNode, NonNullTypeNode)
from ..type import (
    GraphQLType, GraphQLSchema, GraphQLNamedType, GraphQLList, GraphQLNonNull)

__all__ = ['type_from_ast']


@overload
def type_from_ast(schema: GraphQLSchema,
                  type_node: NamedTypeNode) -> Optional[GraphQLNamedType]:
    ...


@overload  # noqa: F811 (pycqa/flake8#423)
def type_from_ast(schema: GraphQLSchema,
                  type_node: ListTypeNode) -> Optional[GraphQLList]:
    ...


@overload  # noqa: F811
def type_from_ast(schema: GraphQLSchema,
                  type_node: NonNullTypeNode) -> Optional[GraphQLNonNull]:
    ...


@overload  # noqa: F811
def type_from_ast(schema: GraphQLSchema,
                  type_node: TypeNode) -> Optional[GraphQLType]:
    ...


def type_from_ast(schema, type_node):  # noqa: F811
    """Get the GraphQL type definition from an AST node.

    Given a Schema and an AST node describing a type, return a GraphQLType
    definition which applies to that type. For example, if provided the parsed
    AST node for `[User]`, a GraphQLList instance will be returned, containing
    the type called "User" found in the schema. If a type called "User" is not
    found in the schema, then None will be returned.
    """
    if isinstance(type_node, ListTypeNode):
        inner_type = type_from_ast(schema, type_node.type)
        return GraphQLList(inner_type) if inner_type else None
    if isinstance(type_node, NonNullTypeNode):
        inner_type = type_from_ast(schema, type_node.type)
        return GraphQLNonNull(inner_type) if inner_type else None
    if isinstance(type_node, NamedTypeNode):
        return schema.get_type(type_node.name.value)
    raise TypeError(f'Unexpected type kind: {type_node.kind}')

# noqa: F811 (pycqa/flake8#423) # noqa: F811 # noqa: F811 # noqa: F811 Get the GraphQL type definition from an AST node.      Given a Schema and an AST node describing a type, return a GraphQLType     definition which applies to that type. For example, if provided the parsed     AST node for `[User]`, a GraphQLList instance will be returned, containing     the type called "User" found in the schema. If a type called "User" is not     found in the schema, then None will be returned.