export function parse_ipv4(value) {
	const D = parseInt(value.slice(0, 2), 16);
	const C = parseInt(value.slice(2, 4), 16);
	const B = parseInt(value.slice(4, 6), 16);
	const A = parseInt(value.slice(6, 8), 16);
	return `${A}.${B}.${C}.${D}`;
}

export function parse_socket_state(socket_state) {
	const ss_lines = socket_state.split('\n').map(line => line.trim());
	const fields = ss_lines[0].split(/\s+/);
	const result = [];

	const field_parsers = {
		'st': (value => parseInt(value, 16)),
		'local_address': parse_ipv4,
		'rem_address': parse_ipv4,
	};

	for (const line of ss_lines.slice(1)) {
		const values = line.split(/\s+/);
		const v_iter = values[Symbol.iterator]();
		const pending = {};
		for (const column of fields.slice(0, -1)) {
			pending[column] = v_iter.next().value;
		}
		pending[fields.at(-1)] = [...v_iter].join(' ');

		for (const [name, parser] of Object.entries(field_parsers)) {
			const local_value = pending[name];
			if (local_value) {
				pending[name] = parser(local_value);
			}
		}

		result.push(pending);

	}
	return result;
}