/**
 * Copyright (c) 2022 Amorphous
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

export const slugify = (...args: (string | number)[]): string => {
	const value = args.join(' ')

	return value
		.normalize('NFD') // split an accented letter in the base letter and the accent
		.replace(/[\u0300-\u036f]/g, '') // remove all previously split accents
		.toLowerCase()
		.trim()
		.replace(/[-_]/g, ' ')
		.replace(/[^a-z0-9 ]/g, '') // remove all chars not letters, numbers and spaces (to be replaced)
		.replace(/\s+/g, '-') // separator
}

type WikilinkResult = {
	target: string
	label: string
}

/**
 *
 * @param wikiLink the string of the link within the `[[]]`
 */
export const parseWikiLink = (wikiLink: string): WikilinkResult => {
	let label = wikiLink
	let target = wikiLink
	// display|target format

	const barIndex = wikiLink.indexOf('|')

	if (barIndex !== -1) {
		label = wikiLink.substring(0, barIndex)
		target = wikiLink.substring(barIndex + 1)
	} else {
		// display->target format

		const rightArrIndex = wikiLink.indexOf('->')

		if (rightArrIndex !== -1) {
			label = wikiLink.substring(0, rightArrIndex)
			target = wikiLink.substring(rightArrIndex + 2)
		} else {
			// target<-display format

			const leftArrIndex = wikiLink.indexOf('<-')

			if (leftArrIndex !== -1) {
				label = wikiLink.substring(leftArrIndex + 2)
				target = wikiLink.substring(0, leftArrIndex)
			}
		}
	}
	return {
		label,
		target,
	}
}