import * as gatsby from "gatsby";
import * as RTE from "fp-ts/ReaderTaskEither";
import * as A from "fp-ts/Array";
import { pipe } from "fp-ts/function";

import { Dependencies } from "../types";
import { getTypeName } from "./getTypeName";
import { buildUnionType } from "./buildUnionType";
import { createType } from "./createType";

/**
 * Registers the `AllDocumentTypes` GraphQL union type containing all provided
 * document types.
 *
 * @param types - List of document types to include in the created union type.
 *
 * @returns The registered `AllDocumentTypes` type.
 */
export const createAllDocumentTypesType = (
	types: gatsby.GatsbyGraphQLObjectType[],
): RTE.ReaderTaskEither<Dependencies, never, gatsby.GatsbyGraphQLUnionType> =>
	pipe(
		RTE.ask<Dependencies>(),
		RTE.chain((deps) =>
			pipe(
				types,
				A.map(getTypeName),
				(types) =>
					buildUnionType({
						name: deps.nodeHelpers.createTypeName("AllDocumentTypes"),
						types,
					}),
				RTE.chainFirst(createType),
			),
		),
	);