// Copyright (c) 2024 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

export default function timeDifference(current: number, previous: number) {
	const msPerMinute = 60 * 1000;
	const msPerHour = msPerMinute * 60;
	const msPerDay = msPerHour * 24;
	const msPerMonth = msPerDay * 30;
	const msPerYear = msPerDay * 365;

	const elapsed = current - previous;

	if (elapsed < msPerMinute) {
		return Math.round(elapsed / 1000) + " seconds ago";
	} else if (elapsed < msPerHour) {
		return Math.round(elapsed / msPerMinute) + " minutes ago";
	} else if (elapsed < msPerDay) {
		return Math.round(elapsed / msPerHour) + " hours ago";
	} else if (elapsed < msPerMonth) {
		return "approximately " + Math.round(elapsed / msPerDay) + " days ago";
	} else if (elapsed < msPerYear) {
		return "approximately " + Math.round(elapsed / msPerMonth) + " months ago";
	} else {
		return "approximately " + Math.round(elapsed / msPerYear) + " years ago";
	}
}
