var cache = new Map();

export async function resolveServer(hs_name) {
	var server = cache.get(hs_name);
	if (server) return server;
	try {
		let res = await fetch(`https://${hs_name}/.well-known/matrix/server`);
		let json = await res.json();
		var server = json["m.server"];
	} catch (error) {
		console.warn(`Failed look up delegated server for ${hs_name}`, error.message);
	}
	if (!server) server = server.includes(':') ? server : server + ":8448";
	cache.set(hs_name, server);
	return server;
}

export function formatBytes(bytes, decimals = 3) {
	if (bytes == undefined) return bytes;
	if (bytes == 0) return "0 Bytes";
	const k = 1024;
	const dm = decimals < 0 ? 0 : decimals;
	const sizes = ['Bytes', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
	const i = Math.floor(Math.log(bytes) / Math.log(k));
	return `${parseFloat((bytes / Math.pow(k, i)).toFixed(dm))} ${sizes[i]}`;
}

var durationFormat = new Intl.DurationFormat("en", {style: "digital"});
export function formatDuration(ms) {
	return durationFormat.format({
		hours: Math.floor(ms / (1000 * 60 * 60)),
		minutes: Math.floor((ms / (1000 * 60)) % 60),
		seconds: Math.floor((ms / 1000) % 60)
	});
}