import assert from "node:assert/strict";
import { readFile } from "node:fs/promises";
import { WorkerClient, CONTEXT_ID } from "./worker-client.mjs";

class FakeWorker {
  constructor() { this.sent = []; this.onmessage = null; this.onerror = null; }
  postMessage(message) {
    this.sent.push(message);
    queueMicrotask(() => this.onmessage?.({ data: {
      schema_version: 1,
      kind: message.kind === "HELLO" ? "CAPABILITIES" : message.kind === "SESSION_ATTACH" ? "SESSION_READY" : message.kind === "SNAPSHOT_REQUEST" ? "STATE_SNAPSHOT" : "COMMAND_RESULT",
      context_id: message.context_id,
      session_id: message.session_id,
      seq: message.seq,
      operation_id: message.operation_id,
      simulation_tick: message.kind === "SIM_STEP" ? message.payload.cycles : 0,
      payload: { status: "verified", tick: message.payload.cycles ?? 0 },
    } }));
  }
  terminate() { this.terminated = true; }
}

const worker = new FakeWorker();
const client = new WorkerClient({ worker, contextId: CONTEXT_ID, sessionId: "frontend-test", timeoutMs: 1000 });
assert.equal((await client.hello()).kind, "CAPABILITIES");
assert.equal((await client.attach()).kind, "SESSION_READY");
const first = await client.step(3, "same-operation");
const sentCount = worker.sent.length;
const replay = await client.step(99, "same-operation");
assert.deepEqual(replay, first);
assert.equal(worker.sent.length, sentCount);
assert.equal(worker.sent.every((message) => message.context_id === CONTEXT_ID), true);
client.close();
assert.equal(worker.terminated, true);
const [html, app, css] = await Promise.all([
  readFile(new URL("./index.html", import.meta.url), "utf8"),
  readFile(new URL("./app.mjs", import.meta.url), "utf8"),
  readFile(new URL("./styles.css", import.meta.url), "utf8"),
]);
assert.match(html, /type="module"/);
assert.match(app, /WorkerClient/);
assert.match(app, /loadWorkspace/);
assert.match(app, /loadSimulationCase/);
assert.match(app, /jogStart/);
assert.match(app, /override/);
assert.doesNotMatch(app, /_sim_|wasm-core|FileSystemSyncAccessHandle/);
assert.match(css, /@media/);
console.log("frontend_m1=passed messages=" + worker.sent.length);