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import isArray from '../utils/is-array';
import compareArrays from '../utils/compare-arrays';
import { Locale } from './constructor';
// internal storage for locale config files
var locales = {};
var globalLocale;
function normalizeLocale(key) {
return key ? key.toLowerCase().replace('_', '-') : key;
}
// pick the locale from the array
// try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
// substring from most specific to least, but move to the next array item if it's a more specific variant than the current root
function chooseLocale(names) {
var i = 0, j, next, locale, split;
while (i < names.length) {
split = normalizeLocale(names[i]).split('-');
j = split.length;
next = normalizeLocale(names[i + 1]);
next = next ? next.split('-') : null;
while (j > 0) {
locale = loadLocale(split.slice(0, j).join('-'));
if (locale) {
return locale;
}
if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
//the next array item is better than a shallower substring of this one
break;
}
j--;
}
i++;
}
return null;
}
function loadLocale(name) {
var oldLocale = null;
// TODO: Find a better way to register and load all the locales in Node
if (!locales[name] && typeof module !== 'undefined' &&
module && module.exports) {
try {
oldLocale = globalLocale._abbr;
require('./locale/' + name);
// because defineLocale currently also sets the global locale, we
// want to undo that for lazy loaded locales
getSetGlobalLocale(oldLocale);
} catch (e) { }
}
return locales[name];
}
// This function will load locale and then set the global locale. If
// no arguments are passed in, it will simply return the current global
// locale key.
export function getSetGlobalLocale (key, values) {
var data;
if (key) {
if (typeof values === 'undefined') {
data = getLocale(key);
}
else {
data = defineLocale(key, values);
}
if (data) {
// moment.duration._locale = moment._locale = data;
globalLocale = data;
}
}
return globalLocale._abbr;
}
export function defineLocale (name, values) {
if (values !== null) {
values.abbr = name;
locales[name] = locales[name] || new Locale();
locales[name].set(values);
// backwards compat for now: also set the locale
getSetGlobalLocale(name);
return locales[name];
} else {
// useful for testing
delete locales[name];
return null;
}
}
// returns locale data
export function getLocale (key) {
var locale;
if (key && key._locale && key._locale._abbr) {
key = key._locale._abbr;
}
if (!key) {
return globalLocale;
}
if (!isArray(key)) {
//short-circuit everything else
locale = loadLocale(key);
if (locale) {
return locale;
}
key = [key];
}
return chooseLocale(key);
}
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