// Type definitions for graphql-relay 0.4
// Project: https://github.com/graphql/graphql-relay-js
// Definitions by: Arvitaly <https://github.com/arvitaly>, nitintutlani <https://github.com/nitintutlani>, Grelinfo <https://github.com/Grelinfo>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.6

import {
    GraphQLBoolean,
    GraphQLInt,
    GraphQLNonNull,
    GraphQLList,
    GraphQLObjectType,
    GraphQLString,
    GraphQLFieldConfig,
    GraphQLInputFieldConfigMap,
    GraphQLFieldConfigMap,
    GraphQLFieldConfigArgumentMap,
    GraphQLResolveInfo,
    GraphQLInterfaceType,
    GraphQLInputType,
    GraphQLOutputType,
    GraphQLFieldResolver,
    GraphQLTypeResolver,
    GraphQLUnionType,
    GraphQLEnumType,
    GraphQLScalarType,
    Thunk
} from "graphql";

// connection/connection.js

/**
 * Returns a GraphQLFieldConfigArgumentMap appropriate to include on a field
 * whose return type is a connection type with forward pagination.
 */
export interface ForwardConnectionArgs {
    after: { type: GraphQLScalarType };
    first: { type: GraphQLScalarType };
}
export const forwardConnectionArgs: GraphQLFieldConfigArgumentMap & ForwardConnectionArgs;

/**
 * Returns a GraphQLFieldConfigArgumentMap appropriate to include on a field
 * whose return type is a connection type with backward pagination.
 */
export interface BackwardConnectionArgs {
    before: { type: GraphQLScalarType };
    last: { type: GraphQLScalarType };
}
export const backwardConnectionArgs: GraphQLFieldConfigArgumentMap & BackwardConnectionArgs;
/**
 * Returns a GraphQLFieldConfigArgumentMap appropriate to include on a field
 * whose return type is a connection type with bidirectional pagination.
 */
export const connectionArgs: GraphQLFieldConfigArgumentMap & ForwardConnectionArgs & BackwardConnectionArgs;

export type ConnectionConfigNodeTypeNullable =
    | GraphQLScalarType
    | GraphQLObjectType
    | GraphQLInterfaceType
    | GraphQLUnionType
    | GraphQLEnumType;

export type ConnectionConfigNodeType =
    | ConnectionConfigNodeTypeNullable
    | GraphQLNonNull<ConnectionConfigNodeTypeNullable>;

export interface ConnectionConfig {
    name?: string | null;
    nodeType: ConnectionConfigNodeType;
    resolveNode?: GraphQLFieldResolver<any, any> | null;
    resolveCursor?: GraphQLFieldResolver<any, any> | null;
    edgeFields?: Thunk<GraphQLFieldConfigMap<any, any>> | null;
    connectionFields?: Thunk<GraphQLFieldConfigMap<any, any>> | null;
}

export interface GraphQLConnectionDefinitions {
    edgeType: GraphQLObjectType;
    connectionType: GraphQLObjectType;
}

/**
 * Returns a GraphQLObjectType for a connection with the given name,
 * and whose nodes are of the specified type.
 */
export function connectionDefinitions(
    config: ConnectionConfig
): GraphQLConnectionDefinitions;

// connection/connectiontypes.js

/**
 * An flow type alias for cursors in this implementation.
 */
export type ConnectionCursor = string;

/**
 * A flow type designed to be exposed as `PageInfo` over GraphQL.
 */
export interface PageInfo {
    startCursor?: ConnectionCursor | null;
    endCursor?: ConnectionCursor | null;
    hasPreviousPage?: boolean | null;
    hasNextPage?: boolean | null;
}

/**
 * A flow type designed to be exposed as a `Connection` over GraphQL.
 */
export interface Connection<T> {
    edges: Array<Edge<T>>;
    pageInfo: PageInfo;
}

/**
 * A flow type designed to be exposed as a `Edge` over GraphQL.
 */
export interface Edge<T> {
    node: T;
    cursor: ConnectionCursor;
}

/**
 * A flow type describing the arguments a connection field receives in GraphQL.
 */
export interface ConnectionArguments {
    before?: ConnectionCursor | null;
    after?: ConnectionCursor | null;
    first?: number | null;
    last?: number | null;
}

// connection/arrayconnection.js

export interface ArraySliceMetaInfo {
    sliceStart: number;
    arrayLength: number;
}

/**
 * A simple function that accepts an array and connection arguments, and returns
 * a connection object for use in GraphQL. It uses array offsets as pagination,
 * so pagination will only work if the array is static.
 */
export function connectionFromArray<T>(
    data: T[],
    args: ConnectionArguments
): Connection<T>;

/**
 * A version of `connectionFromArray` that takes a promised array, and returns a
 * promised connection.
 */
export function connectionFromPromisedArray<T>(
    dataPromise: Promise<T[]>,
    args: ConnectionArguments
): Promise<Connection<T>>;

/**
 * Given a slice (subset) of an array, returns a connection object for use in
 * GraphQL.
 *
 * This function is similar to `connectionFromArray`, but is intended for use
 * cases where you know the cardinality of the connection, consider it too large
 * to materialize the entire array, and instead wish pass in a slice of the
 * total result large enough to cover the range specified in `args`.
 */
export function connectionFromArraySlice<T>(
    arraySlice: T[],
    args: ConnectionArguments,
    meta: ArraySliceMetaInfo
): Connection<T>;

/**
 * A version of `connectionFromArraySlice` that takes a promised array slice,
 * and returns a promised connection.
 */
export function connectionFromPromisedArraySlice<T>(
    dataPromise: Promise<T[]>,
    args: ConnectionArguments,
    arrayInfo: ArraySliceMetaInfo
): Promise<Connection<T>>;

/**
 * Creates the cursor string from an offset.
 */
export function offsetToCursor(offset: number): ConnectionCursor;

/**
 * Rederives the offset from the cursor string.
 */
export function cursorToOffset(cursor: ConnectionCursor): number;

/**
 * Return the cursor associated with an object in an array.
 */
export function cursorForObjectInConnection<T>(
    data: T[],
    object: T
): ConnectionCursor;

/**
 * Given an optional cursor and a default offset, returns the offset
 * to use; if the cursor contains a valid offset, that will be used,
 * otherwise it will be the default.
 */
export function getOffsetWithDefault(
    cursor?: ConnectionCursor | null,
    defaultOffset?: number | null
): number;

// mutation/mutation.js

export type mutationFn = (
    object: any,
    ctx: any,
    info: GraphQLResolveInfo
) => Promise<any> | any;

/**
 * A description of a mutation consumable by mutationWithClientMutationId
 * to create a GraphQLFieldConfig for that mutation.
 *
 * The inputFields and outputFields should not include `clientMutationId`,
 * as this will be provided automatically.
 *
 * An input object will be created containing the input fields, and an
 * object will be created containing the output fields.
 *
 * mutateAndGetPayload will receieve an Object with a key for each
 * input field, and it should return an Object with a key for each
 * output field. It may return synchronously, or return a Promise.
 */
export interface MutationConfig {
    name: string;
    description?: string;
    inputFields: Thunk<GraphQLInputFieldConfigMap>;
    outputFields: Thunk<GraphQLFieldConfigMap<any, any>>;
    mutateAndGetPayload: mutationFn;
    deprecationReason?: string;
}

/**
 * Returns a GraphQLFieldConfig for the mutation described by the
 * provided MutationConfig.
 */
export function mutationWithClientMutationId(
    config: MutationConfig
): GraphQLFieldConfig<any, any>;

// node/node.js

export interface GraphQLNodeDefinitions {
    nodeInterface: GraphQLInterfaceType;
    nodeField: GraphQLFieldConfig<any, any>;
    nodesField: GraphQLFieldConfig<any, any>;
}

export type typeResolverFn = ((any: any) => GraphQLObjectType) |
    ((any: any) => Promise<GraphQLObjectType>);

/**
 * Given a function to map from an ID to an underlying object, and a function
 * to map from an underlying object to the concrete GraphQLObjectType it
 * corresponds to, constructs a `Node` interface that objects can implement,
 * and a field config for a `node` root field.
 *
 * If the typeResolver is omitted, object resolution on the interface will be
 * handled with the `isTypeOf` method on object types, as with any GraphQL
 * interface without a provided `resolveType` method.
 */
export function nodeDefinitions<TContext>(
    idFetcher: ((id: string, context: TContext, info: GraphQLResolveInfo) => any),
    typeResolver?: GraphQLTypeResolver<any, TContext>
): GraphQLNodeDefinitions;

export interface ResolvedGlobalId {
    type: string;
    id: string;
}

/**
 * Takes a type name and an ID specific to that type name, and returns a
 * "global ID" that is unique among all types.
 */
export function toGlobalId(type: string, id: string): string;

/**
 * Takes the "global ID" created by toGlobalID, and returns the type name and ID
 * used to create it.
 */
export function fromGlobalId(globalId: string): ResolvedGlobalId;

/**
 * Creates the configuration for an id field on a node, using `toGlobalId` to
 * construct the ID from the provided typename. The type-specific ID is fetched
 * by calling idFetcher on the object, or if not provided, by accessing the `id`
 * property on the object.
 */
export function globalIdField(
    typeName?: string,
    idFetcher?: (object: any, context: any, info: GraphQLResolveInfo) => string
): GraphQLFieldConfig<any, any>;

// node/plural.js

export interface PluralIdentifyingRootFieldConfig {
    argName: string;
    inputType: GraphQLInputType;
    outputType: GraphQLOutputType;
    resolveSingleInput(input: any, context: any, info: GraphQLResolveInfo): any;
    description?: string;
}

export function pluralIdentifyingRootField(
    config: PluralIdentifyingRootFieldConfig
): GraphQLFieldConfig<any, any>;