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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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import { MapOf } from "@implab/core-amd/interfaces";
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import { mixin } from "@implab/core-amd/safe";
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const trace = TraceSource.get(mid);
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function on<T extends keyof HTMLElementEventMap>(node: HTMLElement, eventName: T, handler: (this: HTMLElement, ev: HTMLElementEventMap[T]) => any): () => void {
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// Add an event listener to a DOM node
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node.addEventListener(eventName, handler, false);
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return () => node.removeEventListener(eventName, handler, false);
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}
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interface NodeLoadResult {
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node: HTMLElement;
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}
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class DomInject {
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injectionPoint = document.head;
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injectBefore = document.head.firstChild;
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_map: MapOf<Promise<NodeLoadResult>> = {};
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_inject<T extends keyof HTMLElementTagNameMap>(name: T, attr: Partial<HTMLElementTagNameMap[T]>) {
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const node = document.createElement(name);
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return new Promise<NodeLoadResult>((ok, fail) => {
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const cleanup = () => {
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noerr();
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noload();
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};
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const noload = on(node, "load", () => {
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ok({ node });
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cleanup();
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});
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const noerr = on(node, "error", e => {
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fail({
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erorr: e,
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node
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});
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cleanup();
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});
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mixin(node, attr);
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this.injectionPoint.insertBefore(node, this.injectBefore);
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});
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}
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async injectScript(url: string) {
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let d = this._map[url];
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if (!d) {
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trace.log("js {0}", url);
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d = this._inject("script", {
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type: "text/javascript",
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charset: "utf-8",
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src: url
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});
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this._map[url] = d;
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}
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try {
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await d;
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trace.log("done {0}", url);
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} catch (e) {
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trace.error("failed {0}: {1}", url, e);
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}
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}
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async injectStylesheet(url: string) {
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let d = this._map[url];
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if (!d) {
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trace.log("js {0}", url);
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d = this._inject("link", {
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type: "text/css",
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rel: "stylesheet",
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href: url
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});
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this._map[url] = d;
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}
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try {
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await d;
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trace.log("done {0}", url);
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} catch (e) {
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trace.error("failed {0}: {1}", url, e);
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}
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}
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};
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const instance = new DomInject();
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export = instance;
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