"use strict";

const debug = require("debug")("promistream:from-node-stream:readable:attach-handlers");

module.exports = function attachReadableStreamHandlers({ stream, onClose, onError, onData }) {
	function detachEventHandlers() {
		debug("Detaching event handlers");
		stream.removeListener("end", onCloseWrapper);
		stream.removeListener("close", onCloseWrapper);
		stream.removeListener("error", onErrorWrapper);
		stream.removeListener("data", onData);
	}

	function attachEventHandlers() {
		debug("Attaching event handlers");
		stream.on("end", onCloseWrapper);
		stream.on("close", onCloseWrapper);
		stream.on("error", onErrorWrapper);
		stream.on("data", onData);
	}

	function onCloseWrapper() {
		debug("onCloseWrapper called");
		onClose();
		detachEventHandlers();
	}

	function onErrorWrapper(error) {
		debug("onErrorWrapper called");
		onError(error);
		detachEventHandlers();
	}

	attachEventHandlers();
};