/**
 * @copyright Copyright (c) 2021 Richard Steinmetz <richard@steinmetz.cloud>
 *
 * @author Richard Steinmetz <richard@steinmetz.cloud>
 *
 * @license AGPL-3.0-or-later
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */

/**
 * Remove the mailto prefix from a URI and return it
 *
 * @param {string} uri URI to remove the prefix from
 * @return {string} URI without a mailto prefix
 */
export function removeMailtoPrefix(uri) {
	if (typeof uri !== 'string') {
		return ''
	}

	if (uri.startsWith('mailto:')) {
		return uri.slice(7)
	}

	return uri
}

/**
 * Add the mailto prefix to a URI if it doesn't have one yet and return it
 *
 * @param {string} uri URI to add the prefix to
 * @return {string} URI with a mailto prefix
 */
export function addMailtoPrefix(uri) {
	if (typeof uri !== 'string') {
		return 'mailto:'
	}

	if (uri.startsWith('mailto:')) {
		return uri
	}

	return `mailto:${uri}`
}

/**
 * Get the display name of an organizer
 *
 * @param {?object} organizer Organizer object to extract a display name from
 * @return {string} Display name of given organizer
 */
export function organizerDisplayName(organizer) {
	if (!organizer) {
		return ''
	}

	if (organizer.commonName) {
		return organizer.commonName
	}

	return removeMailtoPrefix(organizer.uri)
}