import { releaseProxy } from 'comlink'
import { endpointSymbol } from 'vite-plugin-comlink/symbol'

export interface ComlinkWorkerInstanceType {
	readonly [endpointSymbol]: Worker
}

export function destroyWorker(worker: ComlinkWorkerInstanceType) {
	if (!worker) return

	// https://github.com/mathe42/vite-plugin-comlink/pull/138
	worker[endpointSymbol].terminate()
	worker[releaseProxy]() // fly to GC land, little proxy!
}

// Singleton sync worker - created on first use, reused thereafter
let cachedSyncWorker: ComlinkWorker<typeof import('./sync-worker.ts')> | null = null

export function getSyncWorker() {
	if (!cachedSyncWorker) {
		cachedSyncWorker = new ComlinkWorker<typeof import('./sync-worker.ts')>(
			new URL('./sync-worker.ts', import.meta.url),
		)
	}
	return cachedSyncWorker
}