import type {
  HostToKernelMessage,
  KernelToHostMessage,
} from "../../bridge/protocol.ts";
import type { JavaScriptKernelMode } from "./kernel-contract.ts";
import { spawnNodeWorker } from "./worker-host.ts";

export interface WorkerLike {
  readonly mode: JavaScriptKernelMode;
  onError: (handler: (error: Error) => void) => () => void;
  onMessage: (handler: (message: KernelToHostMessage) => void) => () => void;
  postMessage: (message: HostToKernelMessage) => void;
  terminate: () => Promise<void>;
}

export function createInlineWorker(
  cwd: string,
  parallelPoolWidth: number,
  hardenedCells = false
): WorkerLike {
  return spawnNodeWorker(
    new URL("./inline-worker-entry.js", import.meta.url),
    cwd,
    parallelPoolWidth,
    "inline",
    hardenedCells
  );
}