import { encodeMonoPcm16Wav } from "/packages/acoustics-core/wav.js";

function assertNear(actual, expected, tolerance, label) {
  assert(Math.abs(actual - expected) <= tolerance, `${label}: expected ${expected}, received ${actual}`);
}

async function waitFor(predicate, label, timeoutMs = 15000) {
  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 초과됐습니다.`);
}

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

function dispatchChecked(windowObject, element, checked) {
  element.checked = checked;
  element.dispatchEvent(new windowObject.Event("change", { bubbles: true }));
}

function dispatchFiles(windowObject, input, files) {
  const transfer = new windowObject.DataTransfer();
  files.forEach((file) => transfer.items.add(file));
  input.files = transfer.files;
  input.dispatchEvent(new windowObject.Event("change", { bubbles: true }));
}

async function digestHex(blob) {
  const digest = await crypto.subtle.digest("SHA-256", await blob.arrayBuffer());
  return [...new Uint8Array(digest)].map((value) => value.toString(16).padStart(2, "0")).join("");
}

test("Dataset Builder 전체 저장·재연결 흐름이 동일한 scene과 preview WAV를 재현한다", async () => {
  const frame = document.createElement("iframe");
  frame.src = "/apps/dataset-builder/?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("Builder iframe load failed")), { once: true });
  });

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

  try {
    await waitFor(() => documentObject.documentElement.dataset.appReady === "true", "Builder 초기화");
    await waitFor(() => documentObject.documentElement.dataset.sceneValid === "true", "기본 scene 검증");
    assert(documentObject.querySelector("#scene-id").value !== "single-tone", "new default scene gets a unique id");

    const previewSamples = new Float32Array(2000);
    for (let index = 0; index < previewSamples.length; index += 1) {
      previewSamples[index] = Math.sin((2 * Math.PI * 440 * index) / 8000) * 0.12;
    }
    const wavBlob = encodeMonoPcm16Wav(previewSamples, 8000);
    const audioFile = new windowObject.File([wavBlob], "machine.wav", { type: "audio/wav" });
    const svg = '<svg xmlns="http://www.w3.org/2000/svg" width="640" height="480"><rect width="640" height="480" fill="#173128"/><circle cx="420" cy="170" r="70" fill="#65f2bf"/></svg>';
    const imageFile = new windowObject.File([svg], "machine.svg", { type: "image/svg+xml" });
    const staleSvg = '<svg xmlns="http://www.w3.org/2000/svg" width="320" height="240"><rect width="320" height="240" fill="#ff0000"/></svg>';
    const staleImageFile = new windowObject.File([staleSvg], "stale.svg", { type: "image/svg+xml" });

    dispatchFiles(windowObject, documentObject.querySelector("#audio-input"), [audioFile]);
    await waitFor(
      () => [...documentObject.querySelectorAll(".asset-chip__state")].some((item) => item.textContent === "연결됨"),
      "오디오 hash/decode",
    );
    dispatchFiles(windowObject, documentObject.querySelector("#image-input"), [staleImageFile]);
    dispatchFiles(windowObject, documentObject.querySelector("#image-input"), [imageFile]);
    await waitFor(() => documentObject.querySelectorAll(".asset-chip__state").length === 2, "이미지 decode");
    await waitFor(() => documentObject.documentElement.dataset.assetsReady === "true", "asset 준비");

    documentObject.querySelector("#add-source-button").click();
    assertEqual(documentObject.querySelectorAll(".source-card").length, 2, "source card count");
    dispatchValue(windowObject, documentObject.querySelector("#source-name"), "asset source");
    dispatchValue(windowObject, documentObject.querySelector("#source-type"), "asset", "change");
    dispatchChecked(windowObject, documentObject.querySelector("#source-loop"), true);

    const canvas = documentObject.querySelector("#scene-canvas");
    const canvasRect = canvas.getBoundingClientRect();
    canvas.dispatchEvent(new windowObject.PointerEvent("pointerdown", {
      bubbles: true,
      clientX: canvasRect.left + canvasRect.width * 0.75,
      clientY: canvasRect.top + canvasRect.height * 0.25,
    }));
    assertNear(Number(documentObject.querySelector("#source-x").value), 0.3, 0.002, "canvas x");
    assertNear(Number(documentObject.querySelector("#source-y").value), 0.225, 0.002, "canvas y");

    dispatchValue(windowObject, documentObject.querySelector("#ambient-type"), "asset", "change");
    dispatchChecked(windowObject, documentObject.querySelector("#ambient-loop"), true);
    await waitFor(() => documentObject.documentElement.dataset.sceneValid === "true", "편집 scene 검증");

    documentObject.querySelector("#wav-button").click();
    const firstWavDownload = await waitFor(
      () => downloads.find((download) => download.fileName.endsWith(".preview-mix.wav")),
      "첫 preview WAV",
    );
    const firstWav = await fetch(firstWavDownload.url).then((response) => response.blob());
    const firstWavHash = await digestHex(firstWav);

    await waitFor(() => !documentObject.querySelector("#export-button").disabled, "첫 JSON 저장 버튼 복구");
    documentObject.querySelector("#export-button").click();
    const firstJsonDownload = await waitFor(
      () => downloads.find((download) => download.fileName.endsWith(".scene.json")),
      "첫 Scene JSON",
    );
    const firstJsonText = await fetch(firstJsonDownload.url).then((response) => response.text());
    const firstScene = JSON.parse(firstJsonText);
    assertEqual(firstScene.sources.length, 2, "exported source count");
    assertEqual(firstScene.sources[1].signal.loop, true, "source loop exported");
    assertEqual(firstScene.ambient[0].signal.loop, true, "ambient loop exported");
    assertEqual(firstScene.image.widthPixels, 640, "image width exported");
    assert(firstScene.assets.every((asset) => /^[a-f0-9]{64}$/.test(asset.sha256)), "asset hashes exported");

    const sceneFile = new windowObject.File([firstJsonText], "roundtrip.scene.json", { type: "application/json" });
    dispatchFiles(windowObject, documentObject.querySelector("#scene-input"), [sceneFile]);
    await waitFor(() => documentObject.querySelector("#save-state").textContent.startsWith("Scene 불러옴"), "Scene 재로드");
    await waitFor(() => documentObject.documentElement.dataset.assetsReady === "false", "재로드 후 원본 파일 요구");
    dispatchFiles(windowObject, documentObject.querySelector("#audio-input"), [audioFile]);
    await waitFor(
      () => [...documentObject.querySelectorAll(".asset-chip")].some((chip) =>
        chip.querySelector(".asset-chip__label").textContent.includes("machine.wav") &&
        chip.querySelector(".asset-chip__state").textContent === "연결됨"),
      "오디오 SHA 재연결",
    );
    dispatchFiles(windowObject, documentObject.querySelector("#image-input"), [imageFile]);
    await waitFor(() => documentObject.documentElement.dataset.assetsReady === "true", "이미지 SHA 재연결");

    const downloadCountBeforeSecondWav = downloads.length;
    documentObject.querySelector("#wav-button").click();
    const secondWavDownload = await waitFor(
      () => downloads.slice(downloadCountBeforeSecondWav).find((download) => download.fileName.endsWith(".preview-mix.wav")),
      "두 번째 preview WAV",
    );
    const secondWav = await fetch(secondWavDownload.url).then((response) => response.blob());
    assertEqual(await digestHex(secondWav), firstWavHash, "round-trip preview WAV hash");

    await waitFor(() => !documentObject.querySelector("#export-button").disabled, "두 번째 JSON 저장 버튼 복구");
    const downloadCountBeforeSecondJson = downloads.length;
    documentObject.querySelector("#export-button").click();
    const secondJsonDownload = await waitFor(
      () => downloads.slice(downloadCountBeforeSecondJson).find((download) => download.fileName.endsWith(".scene.json")),
      "두 번째 Scene JSON",
    );
    const secondScene = await fetch(secondJsonDownload.url).then((response) => response.json());
    assertEqual(JSON.stringify(secondScene), JSON.stringify(firstScene), "canonical scene round trip");

    documentObject.querySelector("#remove-image-button").click();
    await waitFor(() => documentObject.querySelector("#remove-image-button").classList.contains("is-hidden"), "image remove");
    await waitFor(() => !documentObject.querySelector("#export-button").disabled, "grid-only JSON button");
    const downloadCountBeforeGridJson = downloads.length;
    documentObject.querySelector("#export-button").click();
    const gridJsonDownload = await waitFor(
      () => downloads.slice(downloadCountBeforeGridJson).find((download) => download.fileName.endsWith(".scene.json")),
      "grid-only Scene JSON",
    );
    const gridScene = await fetch(gridJsonDownload.url).then((response) => response.json());
    assertEqual(gridScene.image, undefined, "image reference removed");

    const stableName = documentObject.querySelector("#scene-name").value;
    const invalidFile = new windowObject.File(["{"], "invalid.scene.json", { type: "application/json" });
    dispatchFiles(windowObject, documentObject.querySelector("#scene-input"), [invalidFile]);
    await waitFor(() => documentObject.querySelector("#save-state").textContent.startsWith("불러오기 실패"), "invalid import error");
    assertEqual(documentObject.querySelector("#scene-name").value, stableName, "invalid import preserves scene");

    dispatchValue(windowObject, documentObject.querySelector("#sample-rate"), "96000", "change");
    await waitFor(() => !documentObject.querySelector("#wav-button").disabled, "cancel fixture validation");
    const downloadCountBeforeCancel = downloads.length;
    documentObject.querySelector("#wav-button").click();
    const cancelSceneFile = new windowObject.File([firstJsonText], "cancel.scene.json", { type: "application/json" });
    dispatchFiles(windowObject, documentObject.querySelector("#scene-input"), [cancelSceneFile]);
    await waitFor(() => documentObject.querySelector("#save-state").textContent.startsWith("Scene 불러옴"), "import during decode");
    await new Promise((resolve) => setTimeout(resolve, 250));
    assertEqual(downloads.length, downloadCountBeforeCancel, "cancelled decode does not create stale download");
  } finally {
    windowObject.HTMLAnchorElement.prototype.click = originalAnchorClick;
    windowObject.URL.revokeObjectURL = originalRevoke;
    for (const url of objectUrls) originalRevoke(url);
    frame.remove();
  }
});