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import { MapOf } from "@implab/core-amd/interfaces";
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import { isPromise, mixin } from "@implab/core-amd/safe";
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import { locale as sysLocale } from "dojo/_base/kernel";
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import { id as mid } from "module";
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import { TraceSource } from "@implab/core-amd/log/TraceSource";
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const trace = TraceSource.get(mid);
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type PromiseOrValue<T> = PromiseLike<T> | T;
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type ResolveCallback<T> = () => PromiseOrValue<T>;
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trace.debug("Current sysLocale: {0}", sysLocale);
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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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function isCallback<T>(v: ResolveCallback<T> | PromiseOrValue<T>): v is ResolveCallback<T> {
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return typeof v === "function";
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}
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function chainObjects<T extends object>(o1: T, o2: T) {
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if (!o1)
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return o2;
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if (!o2)
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return o1;
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return mixin(Object.create(o1) as T, o2);
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}
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export class NlsBundle<T extends object> {
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_locales: MapOf<ResolveCallback<T> | PromiseOrValue<T>>;
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default: T;
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_cache: MapOf<PromiseOrValue<T>>;
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constructor(defNls: T, locales?: MapOf<any>) {
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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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const _loc = locale || sysLocale;
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const locales = new Array<string>();
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_loc.split("-").reduce((a, x) => {
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a.push(x);
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locales.unshift(a.join("-"));
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return a;
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}, new Array<string>());
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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.shift();
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if (!locale)
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return this._resolveLocale(locales);
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if (this._cache[locale])
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return this._cache[locale];
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let data = this._locales[locale];
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if (isCallback(data))
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data = data();
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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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