"use strict";

const syncpipe = require("syncpipe");

const timezoneNames = require("./data/timezone-names");

let inverseMapping = syncpipe(timezoneNames, [
	_ => _.map((name, i) => [ name, i ]),
	_ => new Map(_)
]);

module.exports = function lookupTimezoneName(name) {
	if (inverseMapping.has(name)) {
		return inverseMapping.get(name);
	} else {
		// FIXME: Error type, clearer instructions for end users since this may also happen when our timezone list is outdated
		throw new Error(`Unknown timezone name`);
	}
};