import Maybe from '../tsutils/Maybe';
import { DirectiveLocationEnum } from '../language/directiveLocation';

export interface IntrospectionOptions {
  // Whether to include descriptions in the introspection result.
  // Default: true
  descriptions: boolean;

  // Whether to include `isRepeatable` flag on directives.
  // Default: false
  directiveIsRepeatable?: boolean;
}

export function getIntrospectionQuery(options?: IntrospectionOptions): string;

export interface IntrospectionQuery {
  readonly __schema: IntrospectionSchema;
}

export interface IntrospectionSchema {
  readonly queryType: IntrospectionNamedTypeRef<IntrospectionObjectType>;
  readonly mutationType: Maybe<
    IntrospectionNamedTypeRef<IntrospectionObjectType>
  >;
  readonly subscriptionType: Maybe<
    IntrospectionNamedTypeRef<IntrospectionObjectType>
  >;
  readonly types: ReadonlyArray<IntrospectionType>;
  readonly directives: ReadonlyArray<IntrospectionDirective>;
}

export type IntrospectionType =
  | IntrospectionScalarType
  | IntrospectionObjectType
  | IntrospectionInterfaceType
  | IntrospectionUnionType
  | IntrospectionEnumType
  | IntrospectionInputObjectType;

export type IntrospectionOutputType =
  | IntrospectionScalarType
  | IntrospectionObjectType
  | IntrospectionInterfaceType
  | IntrospectionUnionType
  | IntrospectionEnumType;

export type IntrospectionInputType =
  | IntrospectionScalarType
  | IntrospectionEnumType
  | IntrospectionInputObjectType;

export interface IntrospectionScalarType {
  readonly kind: 'SCALAR';
  readonly name: string;
  readonly description?: Maybe<string>;
}

export interface IntrospectionObjectType {
  readonly kind: 'OBJECT';
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly fields: ReadonlyArray<IntrospectionField>;
  readonly interfaces: ReadonlyArray<
    IntrospectionNamedTypeRef<IntrospectionInterfaceType>
  >;
}

export interface IntrospectionInterfaceType {
  readonly kind: 'INTERFACE';
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly fields: ReadonlyArray<IntrospectionField>;
  readonly interfaces: ReadonlyArray<
    IntrospectionNamedTypeRef<IntrospectionInterfaceType>
  >;
  readonly possibleTypes: ReadonlyArray<
    IntrospectionNamedTypeRef<IntrospectionObjectType>
  >;
}

export interface IntrospectionUnionType {
  readonly kind: 'UNION';
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly possibleTypes: ReadonlyArray<
    IntrospectionNamedTypeRef<IntrospectionObjectType>
  >;
}

export interface IntrospectionEnumType {
  readonly kind: 'ENUM';
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly enumValues: ReadonlyArray<IntrospectionEnumValue>;
}

export interface IntrospectionInputObjectType {
  readonly kind: 'INPUT_OBJECT';
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly inputFields: ReadonlyArray<IntrospectionInputValue>;
}

export interface IntrospectionListTypeRef<
  T extends IntrospectionTypeRef = IntrospectionTypeRef
> {
  readonly kind: 'LIST';
  readonly ofType: T;
}

export interface IntrospectionNonNullTypeRef<
  T extends IntrospectionTypeRef = IntrospectionTypeRef
> {
  readonly kind: 'NON_NULL';
  readonly ofType: T;
}

export type IntrospectionTypeRef =
  | IntrospectionNamedTypeRef
  | IntrospectionListTypeRef<any>
  | IntrospectionNonNullTypeRef<
      IntrospectionNamedTypeRef | IntrospectionListTypeRef<any>
    >;

export type IntrospectionOutputTypeRef =
  | IntrospectionNamedTypeRef<IntrospectionOutputType>
  | IntrospectionListTypeRef<any>
  | IntrospectionNonNullTypeRef<
      | IntrospectionNamedTypeRef<IntrospectionOutputType>
      | IntrospectionListTypeRef<any>
    >;

export type IntrospectionInputTypeRef =
  | IntrospectionNamedTypeRef<IntrospectionInputType>
  | IntrospectionListTypeRef<any>
  | IntrospectionNonNullTypeRef<
      | IntrospectionNamedTypeRef<IntrospectionInputType>
      | IntrospectionListTypeRef<any>
    >;

export interface IntrospectionNamedTypeRef<
  T extends IntrospectionType = IntrospectionType
> {
  readonly kind: T['kind'];
  readonly name: string;
}

export interface IntrospectionField {
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly args: ReadonlyArray<IntrospectionInputValue>;
  readonly type: IntrospectionOutputTypeRef;
  readonly isDeprecated: boolean;
  readonly deprecationReason?: Maybe<string>;
}

export interface IntrospectionInputValue {
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly type: IntrospectionInputTypeRef;
  readonly defaultValue?: Maybe<string>;
}

export interface IntrospectionEnumValue {
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly isDeprecated: boolean;
  readonly deprecationReason?: Maybe<string>;
}

export interface IntrospectionDirective {
  readonly name: string;
  readonly description?: Maybe<string>;
  readonly isRepeatable?: boolean;
  readonly locations: ReadonlyArray<DirectiveLocationEnum>;
  readonly args: ReadonlyArray<IntrospectionInputValue>;
}