// static/main.js
(() => {
  // Helpers
  const $ = (id) => document.getElementById(id);
  const qsa = (sel) => Array.from(document.querySelectorAll(sel));

  // Elements
  const form = $("runForm");
  const runBtn = $("runBtn");
  const runBtnText = $("runBtnText");
  const spinner = $("spinner");
  const resetBtn = $("resetBtn");

  const fileInput = $("fileInput");
  const dropzone = $("dropzone");
  const fileMeta = $("fileMeta");
  const previewWrap = $("previewWrap");
  const previewImg = $("previewImg");

  const statusDot = $("statusDot");
  const statusText = $("statusText");
  const statusLog = $("statusLog");
  const jobPill = $("jobPill");

  const imgInput = $("imgInput");
  const imgYolo = $("imgYolo");
  const imgSelected = $("imgSelected");
  const meta = $("meta");

  const dlInput = $("dlInput");
  const dlYolo = $("dlYolo");
  const dlSelected = $("dlSelected");
  const copyMetaBtn = $("copyMetaBtn");

  // Noise elements
  const noiseType = $("noiseType");
  const noiseStrengthHidden = $("noiseStrength");
  const noisePanelNone = $("noisePanelNone");
  const noisePanelGaussian = $("noisePanelGaussian");
  const noisePanelLinear = $("noisePanelLinear");
  const noisePanelAdv = $("noisePanelAdv");
  const noiseGaussian = $("noiseGaussian");
  const noiseLinear = $("noiseLinear");
  const noiseAdv = $("noiseAdv");
  const noiseValGaussian = $("noiseValGaussian");
  const noiseValLinear = $("noiseValLinear");
  const noiseValAdv = $("noiseValAdv");

  // HW noise elements (UI labels only unless backend supports)
  const hwNoiseWidth = $("hwNoiseWidth");
  const hwNoiseStrength = $("hwNoiseStrength");
  const hwNoiseWidthVal = $("hwNoiseWidthVal");
  const hwNoiseStrengthVal = $("hwNoiseStrengthVal");

  function setStatus(kind, text, logLine) {
    // kind: idle | run | ok | bad
    if (statusDot) statusDot.className = `dot ${kind}`;
    if (statusText) statusText.textContent = text;
    if (statusLog && logLine != null) statusLog.textContent = logLine;
  }

  function setRunning(isRunning) {
    if (!runBtn) return;
    runBtn.disabled = isRunning;
    if (spinner) spinner.classList.toggle("hidden", !isRunning);
    if (runBtnText) runBtnText.textContent = isRunning ? "Running…" : "Run";
  }

  function setPreview(file) {
    if (!fileMeta || !previewWrap || !previewImg) return;

    if (!file) {
      fileMeta.textContent = "No file selected";
      previewWrap.classList.add("hidden");
      previewImg.removeAttribute("src");
      return;
    }

    fileMeta.textContent = `${file.name} • ${(file.size / 1024).toFixed(1)} KB`;
    const url = URL.createObjectURL(file);
    previewImg.src = url;
    previewWrap.classList.remove("hidden");
  }

  function setFileToInput(file) {
    const dt = new DataTransfer();
    dt.items.add(file);
    fileInput.files = dt.files;
  }

  // ---------------- Tabs ----------------
  function initTabs() {
    const tabBtns = qsa(".tabBtn");
    const tabPanels = qsa(".tabPanel");

    tabBtns.forEach((btn) => {
      btn.addEventListener("click", () => {
        tabBtns.forEach((b) => b.classList.remove("active"));
        tabPanels.forEach((p) => p.classList.add("hidden"));

        btn.classList.add("active");
        const id = btn.getAttribute("data-tab");
        const panel = $(id);
        if (panel) panel.classList.remove("hidden");
      });
    });
  }

  // ------------- HDC bits toggle -------------
  function initHdcBitsToggle() {
    // score function select has NAME but no ID in your HTML
    const scoreSel = document.querySelector('select[name="score_function"]');
    const bitsField = $("hdcBitsField");
    const bitsSel = $("hdcBits");

    if (!scoreSel || !bitsField || !bitsSel) {
      console.warn("HDC bits toggle: missing DOM elements");
      return;
    }

    const update = () => {
      const isHDC = scoreSel.value === "HDC";
      bitsField.style.display = isHDC ? "" : "none";
      bitsSel.disabled = !isHDC;
    };

    scoreSel.addEventListener("change", update);
    update();
  }

  // ------------- Noise panel switching -------------
  function noiseFamily(val) {
    const t = String(val || "none").toLowerCase();
    if (t === "none" || t === "default" || t === "off") return "none";
    if (t === "gaussian") return "gaussian";
    if (t === "linear") return "linear";
    if (t.startsWith("adv")) return "adv";
    return "none";
  }

  function updateNoiseHidden() {
    if (!noiseType || !noiseStrengthHidden) return;
    const fam = noiseFamily(noiseType.value);

    let v = 0;
    if (fam === "gaussian" && noiseGaussian) v = Number(noiseGaussian.value || 0);
    if (fam === "linear" && noiseLinear) v = Number(noiseLinear.value || 0);
    if (fam === "adv" && noiseAdv) v = Number(noiseAdv.value || 0);

    noiseStrengthHidden.value = String(v);
  }

  function showNoisePanel() {
    if (!noiseType) return;
    const fam = noiseFamily(noiseType.value);

    [noisePanelNone, noisePanelGaussian, noisePanelLinear, noisePanelAdv].forEach((p) => {
      if (p) p.classList.add("hidden");
    });

    if (fam === "none" && noisePanelNone) noisePanelNone.classList.remove("hidden");
    if (fam === "gaussian" && noisePanelGaussian) noisePanelGaussian.classList.remove("hidden");
    if (fam === "linear" && noisePanelLinear) noisePanelLinear.classList.remove("hidden");
    if (fam === "adv" && noisePanelAdv) noisePanelAdv.classList.remove("hidden");

    updateNoiseHidden();
  }

  function initNoise() {
    if (!noiseType) return;

    noiseType.addEventListener("change", showNoisePanel);

    if (noiseGaussian) {
      noiseGaussian.addEventListener("input", () => {
        if (noiseValGaussian) noiseValGaussian.textContent = noiseGaussian.value;
        if (noiseFamily(noiseType.value) === "gaussian") updateNoiseHidden();
      });
    }

    if (noiseLinear) {
      noiseLinear.addEventListener("input", () => {
        if (noiseValLinear) noiseValLinear.textContent = noiseLinear.value;
        if (noiseFamily(noiseType.value) === "linear") updateNoiseHidden();
      });
    }

    if (noiseAdv) {
      noiseAdv.addEventListener("input", () => {
        if (noiseValAdv) noiseValAdv.textContent = noiseAdv.value;
        if (noiseFamily(noiseType.value) === "adv") updateNoiseHidden();
      });
    }

    showNoisePanel();
  }

  // ------------- HW noise label updates -------------
  function initHwNoiseLabels() {
    if (hwNoiseWidth && hwNoiseWidthVal) {
      hwNoiseWidthVal.textContent = hwNoiseWidth.value;
      hwNoiseWidth.addEventListener("input", () => {
        hwNoiseWidthVal.textContent = hwNoiseWidth.value;
      });
    }
    if (hwNoiseStrength && hwNoiseStrengthVal) {
      hwNoiseStrengthVal.textContent = hwNoiseStrength.value;
      hwNoiseStrength.addEventListener("input", () => {
        hwNoiseStrengthVal.textContent = hwNoiseStrength.value;
      });
    }
  }

  // ------------- Upload / Dropzone -------------
  function initUpload() {
    if (!fileInput || !dropzone) return;

    dropzone.addEventListener("click", () => fileInput.click());
    dropzone.addEventListener("keydown", (e) => {
      if (e.key === "Enter" || e.key === " ") {
        e.preventDefault();
        fileInput.click();
      }
    });

    fileInput.addEventListener("change", () => {
      const f = fileInput.files && fileInput.files[0];
      setPreview(f);
    });

    dropzone.addEventListener("dragover", (e) => {
      e.preventDefault();
      dropzone.classList.add("drag");
    });

    dropzone.addEventListener("dragleave", () => {
      dropzone.classList.remove("drag");
    });

    dropzone.addEventListener("drop", (e) => {
      e.preventDefault();
      dropzone.classList.remove("drag");
      const f = e.dataTransfer?.files?.[0];
      if (!f) return;
      setFileToInput(f);
      setPreview(f);
    });
  }

  // ------------- Reset -------------
  function initReset() {
    if (!resetBtn || !form) return;
    resetBtn.addEventListener("click", () => {
      form.reset();
      if (fileInput) fileInput.value = "";
      setPreview(null);

      if (jobPill) jobPill.textContent = "job: —";
      if (imgInput) imgInput.removeAttribute("src");
      if (imgYolo) imgYolo.removeAttribute("src");
      if (imgSelected) imgSelected.removeAttribute("src");
      if (meta) meta.textContent = "";

      // reset labels
      if (noiseValGaussian && noiseGaussian) noiseValGaussian.textContent = noiseGaussian.value;
      if (noiseValLinear && noiseLinear) noiseValLinear.textContent = noiseLinear.value;
      if (noiseValAdv && noiseAdv) noiseValAdv.textContent = noiseAdv.value;

      initHdcBitsToggle();
      showNoisePanel();

      setStatus("idle", "Idle", "Waiting for input…");
      setRunning(false);
    });
  }

  // ------------- Copy meta -------------
  function initCopyMeta() {
    if (!copyMetaBtn || !meta) return;
    copyMetaBtn.addEventListener("click", async () => {
      const text = meta.textContent || "";
      if (!text) return;
      await navigator.clipboard.writeText(text);
      setStatus("ok", "Done", "Copied metadata to clipboard.");
    });
  }

  // ------------- Submit -------------
  function initSubmit() {
    if (!form) return;

    form.addEventListener("submit", async (e) => {
      e.preventDefault();

      const file = fileInput?.files?.[0];
      if (!file) {
        setStatus("bad", "Error", "No file selected.");
        return;
      }

      updateNoiseHidden();
      setRunning(true);
      setStatus("run", "Running", "Submitting request…");

      try {
        const fd = new FormData(form);
        const resp = await fetch("/api/run", { method: "POST", body: fd });
        const data = await resp.json();

        if (!resp.ok || !data.ok) throw new Error(data?.error || `HTTP ${resp.status}`);

        if (jobPill) jobPill.textContent = `job: ${data.job_id}`;

        const bust = `t=${Date.now()}`;
        if (imgInput) imgInput.src = `${data.image_urls.input}?${bust}`;
        if (imgYolo) imgYolo.src = `${data.image_urls.yolo}?${bust}`;
        if (imgSelected) imgSelected.src = `${data.image_urls.selected}?${bust}`;

        if (dlInput) { dlInput.href = data.image_urls.input; dlInput.classList.remove("hidden"); }
        if (dlYolo) { dlYolo.href = data.image_urls.yolo; dlYolo.classList.remove("hidden"); }
        if (dlSelected) { dlSelected.href = data.image_urls.selected; dlSelected.classList.remove("hidden"); }

        if (meta) {
          meta.textContent = JSON.stringify(
            {
              job_id: data.job_id,
              task_id: data.task_id,
              task_name: data.task_name,
              selected_indices: data.selected_indices,
            },
            null,
            2
          );
        }

        setStatus("ok", "Done", "Finished.");
      } catch (err) {
        setStatus("bad", "Error", String(err));
      } finally {
        setRunning(false);
      }
    });
  }

  // Boot
  document.addEventListener("DOMContentLoaded", () => {
    if (!form || !fileInput || !dropzone) {
      console.error("Missing DOM elements: check ids in HTML.");
      if (statusLog) statusLog.textContent = "JS init failed: missing DOM elements (check ids).";
      return;
    }

    initTabs();
    initHdcBitsToggle();
    initNoise();
    initHwNoiseLabels();
    initUpload();
    initReset();
    initCopyMeta();
    initSubmit();

    setStatus("idle", "Idle", "Waiting for input…");
  });
})();