import { validateResult } from "/packages/contracts/validation.js";

async function waitFor(predicate, label, timeoutMs = 30000) {
  const deadline = performance.now() + timeoutMs;
  while (performance.now() < deadline) {
    const value = predicate();
    if (value) return value;
    await new Promise((resolve) => setTimeout(resolve, 40));
  }
  throw new Error(`${label} 대기 시간이 초과되었습니다.`);
}

function dispatchValue(windowObject, element, value, eventName = "change") {
  element.value = String(value);
  element.dispatchEvent(new windowObject.Event(eventName, { bubbles: true }));
}

async function loadJson(path) {
  const response = await fetch(path);
  assert(response.ok, `${path} load failed`);
  return response.json();
}

async function nextPaint(windowObject) {
  await new Promise((resolve) => windowObject.requestAnimationFrame(() =>
    windowObject.requestAnimationFrame(resolve)));
}

test("Acoustic Camera가 8×8 CPU 실행·결과 저장·stale·재실행 흐름을 완주한다", async () => {
  const frame = document.createElement("iframe");
  frame.src = "/apps/acoustic-camera/?integration-test=1";
  frame.style.cssText = "position:fixed;left:-20000px;top:0;width:1400px;height:1000px;border:0";
  document.body.append(frame);
  await new Promise((resolve, reject) => {
    frame.addEventListener("load", resolve, { once: true });
    frame.addEventListener("error", () => reject(new Error("Acoustic Camera iframe load failed")), {
      once: true,
    });
  });

  const windowObject = frame.contentWindow;
  const documentObject = frame.contentDocument;
  const downloads = [];
  const objectUrls = [];
  const originalAnchorClick = windowObject.HTMLAnchorElement.prototype.click;
  const originalRevoke = windowObject.URL.revokeObjectURL.bind(windowObject.URL);
  windowObject.HTMLAnchorElement.prototype.click = function captureDownload() {
    downloads.push({ fileName: this.download, url: this.href });
  };
  windowObject.URL.revokeObjectURL = (url) => objectUrls.push(url);

  try {
    await waitFor(
      () => documentObject.documentElement.dataset.appReady === "true",
      "Acoustic Camera 초기화",
    );
    await waitFor(
      () => documentObject.documentElement.dataset.cameraValid === "true",
      "기본 Camera 입력 검증",
    );

    const canvas = documentObject.querySelector("#scene-canvas");
    await waitFor(() => canvas.width > 0 && canvas.height > 0, "scene canvas 초기 렌더");
    await nextPaint(windowObject);
    const initialCanvas = canvas.toDataURL();

    dispatchValue(windowObject, documentObject.querySelector("#scan-columns"), 8);
    dispatchValue(windowObject, documentObject.querySelector("#scan-rows"), 8);
    dispatchValue(windowObject, documentObject.querySelector("#backend"), "cpu");
    await waitFor(
      () => documentObject.documentElement.dataset.cameraValid === "true" &&
        !documentObject.querySelector("#run-button").disabled,
      "8×8 CPU 입력 검증",
    );
    assertEqual(documentObject.querySelector("#grid-preset").value, "custom", "custom grid preset");

    documentObject.querySelector("#run-button").click();
    await waitFor(
      () => documentObject.documentElement.dataset.runState === "done",
      "8×8 CPU simulation",
      30000,
    );
    assertEqual(documentObject.documentElement.dataset.runBackend, "cpu", "actual backend");
    assertEqual(documentObject.documentElement.dataset.resultBandCount, "1", "result band count");
    assert(documentObject.querySelectorAll("#metric-grid .metric-card").length >= 9, "result metrics rendered");
    assert(!documentObject.querySelector("#metric-grid").classList.contains("is-hidden"), "metrics visible");
    assert(documentObject.querySelector("#result-badge").textContent.includes("CPU"), "backend badge rendered");
    await nextPaint(windowObject);
    assert(canvas.toDataURL() !== initialCanvas, "result heatmap changed the scene canvas");

    documentObject.querySelector("#export-result-button").click();
    const resultDownload = await waitFor(
      () => downloads.find((download) => download.fileName.endsWith(".result.json")),
      "Result JSON download",
    );
    const resultDocument = await fetch(resultDownload.url).then((response) => response.json());
    const [scene, experiment] = await Promise.all([
      loadJson("/assets/sample-scenes/single-tone.scene.json"),
      loadJson("/assets/sample-scenes/single-tone.experiment.json"),
    ]);
    experiment.scan.columns = 8;
    experiment.scan.rows = 8;
    experiment.beamforming.backend = "cpu";
    const resultIssues = await validateResult(resultDocument, { scene, experiment });
    assertEqual(resultIssues.length, 0, `downloaded Result validation: ${resultIssues
      .map((issue) => `${issue.path}: ${issue.message}`)
      .join(" · ")}`);
    assertEqual(resultDocument.backend, "cpu", "exported backend");
    assertEqual(resultDocument.bands[0].rawMap.rows, 8, "exported map rows");
    assertEqual(resultDocument.bands[0].rawMap.columns, 8, "exported map columns");
    assertEqual(resultDocument.bands[0].rawMap.values.length, 64, "exported map value count");
    assert(/^[a-f0-9]{64}$/.test(resultDocument.inputHash), "exported input hash");

    dispatchValue(windowObject, documentObject.querySelector("#dynamic-range"), 24);
    await waitFor(
      () => documentObject.querySelector("#result-badge").textContent.includes("이전 설정"),
      "changed input stale badge",
    );
    assert(documentObject.querySelector("#canvas-badge").textContent.includes("이전 설정"), "canvas stale badge");

    dispatchValue(windowObject, documentObject.querySelector("#dynamic-range"), 30);
    await waitFor(
      () => documentObject.documentElement.dataset.cameraValid === "true" &&
        !documentObject.querySelector("#run-button").disabled,
      "original comparison configuration restore",
    );

    documentObject.querySelector("#run-button").click();
    await waitFor(
      () => documentObject.documentElement.dataset.runState === "running",
      "rerun start",
    );
    assert(!documentObject.querySelector("#cancel-button").classList.contains("is-hidden"), "cancel available");
    await waitFor(
      () => documentObject.documentElement.dataset.runState === "done",
      "8×8 CPU rerun",
      30000,
    );
    assert(!documentObject.querySelector("#result-badge").textContent.includes("이전 설정"), "fresh result badge");
    assertEqual(documentObject.querySelectorAll("#history-list .history-card").length, 2, "rerun history");
  } finally {
    windowObject.HTMLAnchorElement.prototype.click = originalAnchorClick;
    windowObject.URL.revokeObjectURL = originalRevoke;
    for (const url of objectUrls) originalRevoke(url);
    frame.remove();
  }
});