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import { MapOf, PromiseOrValue } from "@implab/core-amd/interfaces";
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import { argumentNotEmptyString, isPromise, mixin } from "@implab/core-amd/safe";
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export type LocaleProvider<T> = () => PromiseOrValue<T | {default: T}>;
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function when<T, T2>(value: PromiseOrValue<T>, cb: (v: T) => PromiseOrValue<T2>): PromiseOrValue<T2> {
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return isPromise(value) ?
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value.then(cb) :
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cb(value);
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}
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const loadPackage = <T extends object>(localeData: LocaleProvider<Partial<T>> | undefined) =>
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localeData ?
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when(localeData(), data => data && "default" in data ? data.default : data) :
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undefined;
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const chainObjects = <T extends object>(o1: T, o2: Partial<T> | undefined): T =>
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o2 ? mixin(Object.create(o1) as T, o2) : o1;
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export class NlsBundle<T extends object> {
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private readonly _locales: MapOf<LocaleProvider<Partial<T>>>;
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private readonly _default: T;
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private _cache: MapOf<PromiseOrValue<T>>;
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constructor(defNls: T, locales?: MapOf<LocaleProvider<Partial<T>>>) {
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this._default = defNls;
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this._locales = locales || {};
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this._cache = {};
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}
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getLocale(locale: string) {
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argumentNotEmptyString(locale, "locale");
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const _loc = locale;
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// en-US => ["en", "en-US"]
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const locales = _loc.split(/-|_/).map((x, i, a) => a.slice(0, i + 1).join("-"));
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return this._resolveLocale(locales);
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}
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_resolveLocale(locales: string[]): PromiseOrValue<T> {
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if (!locales.length)
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return this._default;
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const locale = locales.pop();
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if (!locale)
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throw new Error("The locale can't be empty");
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if (this._cache[locale])
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return this._cache[locale];
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const data = loadPackage(this._locales[locale]);
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const parent = this._resolveLocale(locales);
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return this._cache[locale] = when(data, x => {
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return when(parent, y => this._cache[locale] = chainObjects(y, x));
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});
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}
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}
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