import * as gatsby from "gatsby";
import * as prismicT from "@prismicio/types";
import * as RTE from "fp-ts/ReaderTaskEither";
import { pipe, identity } from "fp-ts/function";

import { buildObjectType } from "../lib/buildObjectType";

import { Dependencies, IterableElement } from "../types";

/**
 * Builds a GraphQL Type used by a document's `alternate_language` field. The
 * resulting type can be created using Gatsby's `createTypes` action.
 */
// TODO: Move typename to Dependencies (create in `buildDependencies.ts`).
export const buildAlternateLanguageType: RTE.ReaderTaskEither<
	Dependencies,
	never,
	gatsby.GatsbyGraphQLType
> = pipe(
	RTE.ask<Dependencies>(),
	RTE.chain((deps) =>
		buildObjectType({
			name: deps.nodeHelpers.createTypeName("AlternateLanguageType"),
			fields: {
				id: "ID",
				uid: "String",
				lang: "String",
				type: "String",
				document: {
					type: deps.nodeHelpers.createTypeName("AllDocumentTypes"),
					resolve: (
						source: IterableElement<
							prismicT.PrismicDocument["alternate_languages"]
						>,
					): string | null => deps.nodeHelpers.createNodeId(source.id),
					extensions: { link: {} },
				},
				raw: { type: "JSON", resolve: identity },
			},
		}),
	),
);