/*
 * SPDX-FileCopyrightText: syuilo and other misskey contributors
 * SPDX-License-Identifier: AGPL-3.0-only
 */

export function nyaize(text: string): string {
	return text
		// ja-JP
		.replaceAll('な', 'にゃ').replaceAll('ナ', 'ニャ').replaceAll('ﾅ', 'ﾆｬ')
		// en-US
		.replace(/na/gi, (match) => match === 'NA' ? 'NYA' : 'nya')
		.replace(/morning/gi, (match) => match === 'MORNING' ? 'MORNYAN' : 'mornyan')
		.replace(/everyone/gi, (match) => match === 'EVERYONE' ? 'EVERYNYAN' : 'everynyan')
		// ko-KR
		.replace(/[나-낳]/g, match => String.fromCharCode(
			match.charCodeAt(0)! + '냐'.charCodeAt(0) - '나'.charCodeAt(0),
		))
		.replace(/(다$)|(다(?=\.))|(다(?= ))|(다(?=!))|(다(?=\?))/gm, '다냥')
		.replace(/(야(?=\?))|(야$)|(야(?= ))/gm, '냥');
}