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import { Deserializable } from "../client/util/SerializationHelper";
import { FieldWaiting } from "./Doc";
import { primitive, serializable } from "serializr";
import { observable, action, runInAction } from "mobx";
import { DocServer } from "../client/DocServer";
import { RefField } from "./RefField";
import { ObjectField } from "./ObjectField";
import { Id, Copy, ToScriptString, ToString } from "./FieldSymbols";
import { scriptingGlobal } from "../client/util/Scripting";
import { Plugins } from "./util";
@Deserializable("proxy")
export class ProxyField<T extends RefField> extends ObjectField {
constructor();
constructor(value: T);
constructor(fieldId: string);
constructor(value?: T | string) {
super();
this.fieldId = typeof value === "string" ? value : (value?.[Id] ?? "");
}
[Copy]() { return new ProxyField<T>((this.cache ?? this.fieldId) as T); }
[ToScriptString]() { return "invalid"; }
[ToString]() { return "ProxyField"; }
@serializable(primitive())
readonly fieldId: string = "";
private failed = false;
private promise?: Promise<any>;
private get cache(): T | undefined { return DocServer.GetCachedRefField(this.fieldId) as T }
value(): T | undefined | FieldWaiting<T> {
if (this.cache) return this.cache;
if (this.failed) return undefined;
if (!this.promise) {
this.promise = DocServer.GetRefField(this.fieldId).then(action((field: any) => {
this.promise = undefined;
if (field === undefined) this.failed = true;
return field;
}));
}
return this.promise as any;
}
promisedValue(): string { return !this.cache && !this.failed && !this.promise ? this.fieldId : ""; }
setPromise(promise: any) {
if (this.cache === undefined) this.promise = promise;
}
}
export namespace ProxyField {
let useProxy = true;
export function DisableProxyFields() {
useProxy = false;
}
export function EnableProxyFields() {
useProxy = true;
}
export function WithoutProxy<T>(fn: () => T) {
DisableProxyFields();
try {
return fn();
} finally {
EnableProxyFields();
}
}
export function initPlugin() {
Plugins.addGetterPlugin((doc, _, value) => {
if (useProxy && value instanceof ProxyField) {
return { value: value.value() };
}
});
}
}
function prefetchValue(proxy: PrefetchProxy<RefField>) {
return proxy.value() as any;
}
@scriptingGlobal
@Deserializable("prefetch_proxy", prefetchValue)
export class PrefetchProxy<T extends RefField> extends ProxyField<T> {
}
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