import { EventEmitter } from "node:events";
import type { DocumentAccessor } from "../../model/doc";
import { type DiffWatcherEvent, type IDiffWatcher, linkWatcher } from "../watcher";

export class WatcherCompositer extends EventEmitter implements IDiffWatcher {
	refWatchers: IDiffWatcher[];
	on<U extends keyof DiffWatcherEvent>(event: U, listener: DiffWatcherEvent[U]): this {
		return super.on(event, listener);
	}
	emit<U extends keyof DiffWatcherEvent>(event: U, ...arg: Parameters<DiffWatcherEvent[U]>): boolean {
		return super.emit(event, ...arg);
	}
	constructor(refWatchers: IDiffWatcher[]) {
		super();
		this.refWatchers = refWatchers;
		for (const refWatcher of this.refWatchers) {
			linkWatcher(refWatcher, this);
		}
	}
	async setup(cntr: DocumentAccessor): Promise<void> {
		await Promise.all(this.refWatchers.map((x) => x.setup(cntr)));
	}
}