(() => {
  const $ = (id) => document.getElementById(id);
  const form = $("measure-test");
  const { endpoint, totalHeightLabel } = form.dataset;
  const fileInput = $("imageFile");
  const submitButton = $("submitBtn");
  const clearButton = $("clearBtn");
  const copyButton = $("copyBtn");
  const metrics = $("metricsBar");
  const results = $("resultsArea");
  const jsonContent = $("jsonContent");
  const placeholder = $("imagePlaceholder");
  const imageStack = $("imageStack");
  const baseImage = $("baseImage");
  const annotationImage = $("annotationImage");
  let originalImageUrl;

  function setStatus(text, type = "") {
    const status = $("statusBar");
    status.textContent = text;
    status.className = type ? "status " + type : "status";
  }

  function resetResults() {
    results.classList.add("hidden");
    metrics.classList.add("hidden");
    jsonContent.textContent = "";
    imageStack.hidden = true;
    placeholder.hidden = false;
    placeholder.textContent = "提交后显示叠加效果";
    baseImage.removeAttribute("src");
    annotationImage.removeAttribute("src");
    if (originalImageUrl) {
      URL.revokeObjectURL(originalImageUrl);
      originalImageUrl = undefined;
    }
  }

  function updateOverlay() {
    baseImage.hidden = !$("showBase").checked;
    annotationImage.hidden = !$("showAnno").checked;
    annotationImage.style.opacity = $("annoOpacity").value / 100;
  }

  function renderMetrics(data) {
    const courts = data.four_courts || {};
    const eyes = data.seven_eyes || {};
    const items = [[totalHeightLabel, data.face_total_height_cm]];
    if (form.hasAttribute("data-include-top-court")) items.push(["顶庭", courts.top_court_cm]);
    items.push(
      ["上庭", courts.upper_court_cm],
      ["中庭", courts.middle_court_cm],
      ["下庭", courts.lower_court_cm],
      ["单眼宽度", eyes.eye_width_cm],
      ["脸宽", eyes.face_width_cm],
      ["两眼间距", eyes.inter_eye_distance_cm],
    );

    metrics.replaceChildren();
    for (const [label, value] of items) {
      const card = document.createElement("div");
      card.className = "metric";
      card.innerHTML = '<div class="label"></div><div class="value"><span></span> <span class="unit">cm</span></div>';
      card.querySelector(".label").textContent = label;
      card.querySelector(".value span").textContent = value ?? "—";
      metrics.append(card);
    }
    metrics.classList.remove("hidden");
  }

  form.addEventListener("submit", async (event) => {
    event.preventDefault();
    const selected = fileInput.files[0];
    if (!selected) {
      setStatus("请先选择一张图片", "error");
      return;
    }

    fileInput.disabled = submitButton.disabled = clearButton.disabled = true;
    submitButton.textContent = "⏳ 请求中...";
    resetResults();
    setStatus("正在请求 " + endpoint, "info");

    try {
      const file = await window.downscaleImageFile(selected);
      const body = new FormData();
      body.append("image_file", file);
      const start = performance.now();
      const response = await window.hairClientFetch(endpoint, { method: "POST", body });
      if (!response.headers.get("Content-Type")?.includes("application/json")) {
        throw new Error("服务返回 HTTP " + response.status + "，响应格式异常");
      }
      const result = await response.json();
      const elapsed = ((performance.now() - start) / 1000).toFixed(2);
      jsonContent.textContent = JSON.stringify(result, null, 2);
      results.classList.remove("hidden");

      if (!response.ok || result.code !== 0) {
        setStatus(`请求失败 (${elapsed}s) · HTTP ${response.status} · code ${result.code} · ${result.message}`, "error");
        placeholder.textContent = "请求失败，无标注图";
        return;
      }

      const data = result.data;
      const annotationSrc = window.resolveImgSrc(data.annotated_image_url, data.annotated_image_base64, "image/png");
      if (annotationSrc) {
        originalImageUrl = URL.createObjectURL(file);
        baseImage.src = originalImageUrl;
        annotationImage.src = annotationSrc;
        updateOverlay();
        imageStack.hidden = false;
        placeholder.hidden = true;
      } else {
        placeholder.textContent = "服务未返回标注图";
      }
      renderMetrics(data);
      setStatus(`请求成功 (${elapsed}s) · request_id ${result.request_id}`, "success");
    } catch (error) {
      setStatus(error.message, "error");
    } finally {
      fileInput.disabled = submitButton.disabled = clearButton.disabled = false;
      submitButton.textContent = "🚀 提交测试";
    }
  });

  $("showBase").addEventListener("change", updateOverlay);
  $("showAnno").addEventListener("change", updateOverlay);
  $("annoOpacity").addEventListener("input", updateOverlay);
  clearButton.addEventListener("click", () => {
    resetResults();
    fileInput.value = "";
    setStatus("");
  });

  copyButton.addEventListener("click", async () => {
    try {
      await navigator.clipboard.writeText(jsonContent.textContent);
      copyButton.textContent = "✅ 已复制";
      setTimeout(() => { copyButton.textContent = "📋 复制"; }, 1500);
    } catch {
      setStatus("复制失败，请手动复制 JSON", "error");
    }
  });

  fileInput.addEventListener("change", () => {
    if (fileInput.files.length) setStatus("已选择 " + fileInput.files[0].name, "info");
  });
  fileInput.addEventListener("dragover", (event) => event.preventDefault());
  fileInput.addEventListener("drop", (event) => {
    event.preventDefault();
    if (event.dataTransfer.files.length) {
      fileInput.files = event.dataTransfer.files;
      fileInput.dispatchEvent(new Event("change"));
    }
  });
})();