/*
This file is part of web3.js.

web3.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

web3.js 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
*/

import { sha3Raw } from 'web3-utils';
// eslint-disable-next-line camelcase
import { ens_normalize } from '@adraffy/ens-normalize';

export const normalize = (name: string) => ens_normalize(name);

export const namehash = (inputName: string) => {
	// Reject empty names:
	let node = '';
	for (let i = 0; i < 32; i += 1) {
		node += '00';
	}

	if (inputName) {
		const name = normalize(inputName);
		const labels = name.split('.');

		for (let i = labels.length - 1; i >= 0; i -= 1) {
			const labelSha = sha3Raw(labels[i]).slice(2);
			node = sha3Raw(`0x${node}${labelSha}`).slice(2);
		}
	}

	return `0x${node}`;
};