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

import { Dependencies, TypePathKind, TypePathNode } from "../types";
import { serializePath } from "../runtime/serializePath";

import { dotPath } from "./dotPath";

/**
 * Returns a `TypePath` node for a given path using the environment's `getNode` function.
 *
 * @param path - Path used as a key to find a matching TypePath node.
 *
 * @returns The TypePath with the given key, if available.
 */
export const getTypePath = (
	kind: TypePathKind,
	path: string[],
): RTE.ReaderTaskEither<Dependencies, Error, TypePathNode> =>
	pipe(
		RTE.ask<Dependencies>(),
		RTE.bind("nodeId", (scope) =>
			RTE.right(
				scope.nodeHelpers.createNodeId(["TypePathType", serializePath(path)]),
			),
		),
		RTE.chain((scope) =>
			RTE.fromIO(() => scope.getNode(scope.nodeId) as TypePathNode),
		),
		RTE.filterOrElse(
			(result) => result != null,
			() =>
				new Error(
					`Could not find a "${kind}" type path for path: "${dotPath(path)}"`,
				),
		),
	);