export function isValidPhoneNumber(value: string): boolean {
	let compact = '';
	for (const character of value.trim()) {
		if (!' \t\n\r()./-'.includes(character)) compact += character;
	}
	if (!compact) return true;
	if (compact.length === 10 && compact[0] === '0' && digits(compact, 0)) return true;
	if (compact.startsWith('00')) compact = `+${compact.slice(2)}`;
	return (
		compact.startsWith('+') && compact.length >= 9 && compact.length <= 16 && digits(compact, 1)
	);
}

function digits(value: string, start: number): boolean {
	for (let index = start; index < value.length; index += 1) {
		const character = value.charCodeAt(index);
		if (character < 48 || character > 57) return false;
	}
	return true;
}