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

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

/**
 * Builds a GraphQL type used by Image fields for their `dimensions` field. The
 * resulting type can be created using Gatsby's `createTypes` action.
 */
// TODO: Move typename to Dependencies (create in `buildDependencies.ts`).
export const buildImageDimensionsType: RTE.ReaderTaskEither<
	Dependencies,
	never,
	gatsby.GatsbyGraphQLType
> = pipe(
	RTE.ask<Dependencies>(),
	RTE.chain((deps) =>
		buildObjectType({
			name: deps.globalNodeHelpers.createTypeName("ImageDimensionsType"),
			fields: {
				width: "Int!",
				height: "Int!",
			},
		}),
	),
);