import graphql

# build_executable schema
#
# accepts schema_definition (string) and resolvers (object) in style of graphql-tools
# returns a schema ready for execution

def build_executable_schema(schema_definition, resolvers):
    ast = graphql.parse(schema_definition)
    schema = graphql.build_ast_schema(ast)

    for typeName in resolvers:
        fieldType = schema.get_type(typeName)

        for fieldName in resolvers[typeName]:
            if fieldType is graphql.GraphQLScalarType:
                fieldType.fields[fieldName].resolver = resolvers[typeName][fieldName]
                continue

            field = fieldType.fields[fieldName]
            field.resolver = resolvers[typeName][fieldName]

        if not fieldType.fields: continue

        for remaining in fieldType.fields:
            if not fieldType.fields[remaining].resolver:
                fieldType.fields[remaining].resolver = \
                    lambda value, info, _r=remaining, **args: value[_r]


    return schema