import assert from "node:assert/strict";
import test from "node:test";
import { Worker } from "node:worker_threads";
import { SharedProfile } from "./profile.js";
import { YawnCore } from "./index.js";

test("shared profiles replace unread samples and exclude overlapping reads/writes", () => {
  const writer = new SharedProfile(new SharedArrayBuffer(512));
  const reader = new SharedProfile(writer.buffer);
  assert.equal(reader.read(), undefined);
  writer.write(JSON.stringify({ frame: 1, name: "GPU → SAB" }));
  writer.write(JSON.stringify({ frame: 2, name: "light + opaque" }));
  assert.deepEqual(reader.read(), { frame: 2, name: "light + opaque" });
  assert.equal(reader.read(), undefined);
  Atomics.store(writer.header, 0, 1);
  assert.equal(writer.write('{"frame":3}'), false);
  assert.equal(reader.read(), undefined);
  Atomics.store(writer.header, 0, 0);
  assert.equal(writer.write(" ".repeat(513)), false);
  assert.equal(writer.write('{"frame":4}'), true);
  writer.clear();
  assert.equal(reader.read(), undefined);
});

test("concurrent shared profile publication never mixes samples", async () => {
  const reader = new SharedProfile();
  const done = new Int32Array(new SharedArrayBuffer(4));
  const worker = new Worker(
    `
    const {workerData} = require('node:worker_threads');
    (async () => {
      const {SharedProfile} = await import(workerData.module);
      const writer = new SharedProfile(workerData.buffer);
      for (let frame = 1; frame <= 2000; frame++) {
        const json = JSON.stringify({frame, values: Array(128).fill(frame * 3 + 7), name: 'GPU → SAB'});
        while (!writer.write(json)) await new Promise(r => setImmediate(r));
      }
      Atomics.store(new Int32Array(workerData.done), 0, 1);
    })();
  `,
    {
      eval: true,
      workerData: {
        module: new URL("./profile.js", import.meta.url).href,
        buffer: reader.buffer,
        done: done.buffer,
      },
    },
  );
  const exit = new Promise((resolve, reject) => {
    worker.once("error", reject);
    worker.once("exit", (code) =>
      code ? reject(new Error(`Worker exit ${code}`)) : resolve(),
    );
  });
  try {
    let last = 0;
    while (!Atomics.load(done, 0) || Atomics.load(reader.header, 0) === 2) {
      const sample = reader.read();
      if (sample) {
        assert.ok(sample.frame > last);
        assert.deepEqual(sample.values, Array(128).fill(sample.frame * 3 + 7));
        assert.equal(sample.name, "GPU → SAB");
        last = sample.frame;
      }
      await new Promise((r) => setImmediate(r));
    }
    await exit;
    assert.equal(last, 2000);
  } finally {
    await worker.terminate();
  }
});

test("onProfile reads SAB without result messages and stops on unsubscribe/dispose", async (t) => {
  t.mock.timers.enable({ apis: ["setInterval"] });
  const messages = [];
  let receive;
  let writer;
  const worker = {
    addEventListener(type, listener) {
      if (type === "message") receive = listener;
    },
    postMessage(message) {
      messages.push(message.type);
      writer = new SharedProfile(message.profileBuffer);
      queueMicrotask(() =>
        receive({
          data: {
            request: message.request,
            result: {
              buffer: new SharedArrayBuffer(64),
              features: [],
              rows: [],
            },
          },
        }),
      );
    },
    terminate() {},
  };
  const core = new YawnCore({}, { workerFactory: () => worker });
  await core.ready;
  const samples = [];
  const stop = core.onProfile((sample) => samples.push(sample));
  writer.write('{"frame":9,"milliseconds":1.25}');
  t.mock.timers.tick(99);
  assert.equal(samples.length, 0);
  t.mock.timers.tick(1);
  assert.deepEqual(samples, [{ frame: 9, milliseconds: 1.25 }]);
  t.mock.timers.tick(100);
  assert.equal(samples.length, 1);
  assert.deepEqual(messages, ["init"]);
  stop();
  writer.write('{"frame":10}');
  t.mock.timers.tick(100);
  assert.equal(samples.length, 1);
  core.onProfile((sample) => samples.push(sample));
  core.dispose();
  t.mock.timers.tick(100);
  assert.equal(samples.length, 1);
});