(function () {
  const LOG = '[led-tool/editor]';
  const log = (...args) => console.log(LOG, ...args);

  const apiBase =
    (document.body && document.body.dataset.apiBase) ||
    (window.location.pathname.includes('/led-tool') ? '/led-tool' : '');
  const statusEl = document.getElementById('status');
  const messageEl = document.getElementById('flash');
  const portSelect = document.getElementById('host-port');
  const rawJson = document.getElementById('raw_json');
  const hostWrap = document.getElementById('host-serial-wrap');
  const webWrap = document.getElementById('webserial-wrap');
  const connectBtn = document.getElementById('webserial-connect');
  const disconnectBtn = document.getElementById('webserial-disconnect');
  const hostConnectBtn = document.getElementById('host-connect');
  const hostDisconnectBtn = document.getElementById('host-disconnect');
  const refreshPortsBtn = document.getElementById('btn-refresh-ports');

  const DEFAULT_HOST_PORT = '/dev/ttyACM0';

  let webClient = null;
  let webPort = null;
  let hostConnected = false;
  let hostConnectedPort = '';
  let transferBusy = false;

  const webSerialOk = window.LedToolWebSerial && window.LedToolWebSerial.supported();

  function setStatus(text, isError) {
    if (!statusEl) return;
    statusEl.textContent = text;
    statusEl.classList.toggle('error', Boolean(isError));
  }

  function flash(text, isError) {
    if (!messageEl) return;
    messageEl.textContent = text;
    messageEl.className = isError ? 'flash error show' : 'flash show';
    setTimeout(() => messageEl.classList.remove('show'), 5000);
  }

  function formToObject() {
    const out = {};
    document.querySelectorAll('[data-setting]').forEach((el) => {
      const key = el.getAttribute('data-setting');
      if (!key) return;
      const raw = (el.value || '').trim();
      if (raw === '') return;
      if (el.type === 'number') {
        const n = parseInt(raw, 10);
        if (!Number.isNaN(n)) out[key] = n;
      } else if (el.tagName === 'SELECT' && el.id === 'debug') {
        out[key] = raw === 'True';
      } else {
        out[key] = raw;
      }
    });
    return out;
  }

  function objectToForm(settings) {
    if (!settings || typeof settings !== 'object') return;
    document.querySelectorAll('[data-setting]').forEach((el) => {
      const key = el.getAttribute('data-setting');
      if (!key || !Object.prototype.hasOwnProperty.call(settings, key)) return;
      const v = settings[key];
      if (el.id === 'debug') {
        el.value = v === true || v === 'True' ? 'True' : 'False';
      } else {
        el.value = v === undefined || v === null ? '' : String(v);
      }
    });
    if (rawJson) rawJson.value = JSON.stringify(settings, null, 2);
  }

  function usingWebSerial() {
    return webClient && webClient.connected;
  }

  function usingHostSerial() {
    return hostConnected && Boolean(hostConnectedPort);
  }

  function updateUi() {
    const webOpen = usingWebSerial();
    const hostOpen = usingHostSerial();
    if (webWrap) webWrap.hidden = !webSerialOk || hostOpen;
    if (connectBtn) connectBtn.hidden = webOpen || hostOpen || !webSerialOk;
    if (disconnectBtn) disconnectBtn.hidden = !webOpen;
    if (hostWrap) hostWrap.hidden = webOpen;
    const hostFieldsLocked = webOpen || hostOpen;
    if (portSelect) portSelect.disabled = hostFieldsLocked;
    if (refreshPortsBtn) refreshPortsBtn.disabled = hostFieldsLocked;
    if (hostConnectBtn) hostConnectBtn.hidden = hostOpen || webOpen;
    if (hostDisconnectBtn) hostDisconnectBtn.hidden = !hostOpen || webOpen;
    if (webOpen) {
      setStatus('USB open (device not reset until Download/Upload).');
    } else if (hostOpen) {
      setStatus(`Host serial: ${hostConnectedPort} (use Download or Upload).`);
    } else if (webSerialOk) {
      setStatus('Connect host serial or Web Serial USB, then Download or Upload.');
    } else {
      setStatus(`Connect host serial (default ${DEFAULT_HOST_PORT}).`);
    }
  }

  async function loadHostPorts() {
    if (!portSelect) return;
    try {
      const res = await fetch(`${apiBase}/ports`);
      const data = await res.json();
      const prev = portSelect.value;
      portSelect.innerHTML = '<option value="">Select port</option>';
      for (const p of data.ports || []) {
        const opt = document.createElement('option');
        opt.value = p.device;
        opt.textContent = `${p.device} - ${p.description || 'device'}`;
        portSelect.appendChild(opt);
      }
      const acm0 = DEFAULT_HOST_PORT;
      const hasAcm0 = [...portSelect.options].some((o) => o.value === acm0);
      if (hasAcm0) {
        portSelect.value = acm0;
      } else if (prev && [...portSelect.options].some((o) => o.value === prev)) {
        portSelect.value = prev;
      }
    } catch (e) {
      flash(`Could not list host ports: ${e.message}`, true);
    }
  }

  function selectedHostPort() {
    return portSelect && portSelect.value ? portSelect.value.trim() : '';
  }

  function hostPort() {
    if (hostConnected && hostConnectedPort) return hostConnectedPort;
    return selectedHostPort();
  }

  function connectHostSerial() {
    if (usingWebSerial()) {
      disconnectWebSerial();
    }
    const port = selectedHostPort();
    if (!port) {
      flash('Select a host serial port.', true);
      return;
    }
    hostConnectedPort = port;
    hostConnected = true;
    log('connectHostSerial', port);
    updateUi();
    flash(`Host serial ready: ${port}`, false);
  }

  function disconnectHostSerial() {
    hostConnected = false;
    hostConnectedPort = '';
    updateUi();
  }

  async function downloadHost() {
    const port = hostConnectedPort || hostPort();
    if (!port) {
      flash('Connect host serial first.', true);
      return;
    }
    log('downloadHost', port);
    setStatus('Downloading from device (host serial)...');
    const res = await fetch(`${apiBase}/settings?port=${encodeURIComponent(port)}`);
    const data = await res.json();
    log('downloadHost response', { ok: res.ok, status: res.status, data });
    if (!res.ok) {
      throw new Error(data.error || 'Download failed');
    }
    if (!data.settings) {
      throw new Error('No settings in response (check CLI output)');
    }
    objectToForm(data.settings);
    flash('Settings downloaded.', false);
    setStatus(`Downloaded from ${port}`);
  }

  async function uploadHost() {
    const port = hostConnectedPort || hostPort();
    if (!port) {
      flash('Connect host serial first.', true);
      return;
    }
    const payload = { port, ...formToObject() };
    log('uploadHost', payload);
    setStatus('Uploading via host serial (led-cli)...');
    const res = await fetch(`${apiBase}/settings`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    });
    const data = await res.json();
    if (!res.ok) throw new Error(data.error || 'Upload failed');
    if (!data.ok) throw new Error(data.stderr || 'led-cli failed');
    flash('Settings uploaded; device resetting.', false);
    setStatus('Upload complete.');
  }

  async function connectWebSerial() {
    if (!window.LedToolWebSerial || !window.LedToolWebSerial.supported()) {
      flash('Web Serial not supported (use Chrome or Edge over HTTPS or localhost).', true);
      return;
    }
    if (usingHostSerial()) {
      disconnectHostSerial();
    }
    log('connectWebSerial: requestPort');
    setStatus('Opening USB port…');
    webPort = await window.LedToolWebSerial.requestPort();
    log('connectWebSerial: port selected', webPort);
    webClient = new window.LedToolWebSerial.MicroPythonRawRepl();
    await webClient.connect(webPort);
    updateUi();
    flash('USB port open. Use Download or Upload to talk to the device.', false);
  }

  async function disconnectWebSerial() {
    if (webClient) {
      try {
        await webClient.disconnect();
      } catch (_) {
        /* ignore */
      }
    }
    webClient = null;
    webPort = null;
    updateUi();
  }

  async function downloadWebSerial() {
    log('downloadWebSerial');
    setStatus('Reading settings from device (Web Serial)…');
    const settings = await webClient.readSettingsJson();
    log('downloadWebSerial result', settings);
    objectToForm(settings);
    if (rawJson) rawJson.value = JSON.stringify(settings, null, 2);
    flash('Settings read over Web Serial.', false);
    setStatus('Downloaded via Web Serial.');
  }

  async function uploadWebSerial() {
    log('uploadWebSerial');
    let settings = {};
    if (rawJson && rawJson.value.trim()) {
      try {
        settings = JSON.parse(rawJson.value);
      } catch (e) {
        flash('Invalid JSON in raw panel.', true);
        return;
      }
    } else {
      settings = await webClient.readSettingsJson();
      Object.assign(settings, formToObject());
    }
    await webClient.writeSettingsJson(settings);
    flash('Uploaded via Web Serial; device resetting.', false);
    setStatus('Upload complete.');
    await disconnectWebSerial();
  }

  document.getElementById('btn-download')?.addEventListener('click', async () => {
    if (transferBusy) return;
    transferBusy = true;
    try {
      if (usingWebSerial()) {
        await downloadWebSerial();
      } else if (usingHostSerial()) {
        await downloadHost();
      } else {
        flash(
          webSerialOk
            ? 'Connect host serial or Web Serial USB first.'
            : 'Click Connect on host serial first.',
          true,
        );
      }
    } catch (e) {
      console.error(LOG, 'download failed', e);
      if (rawJson) rawJson.value = String(e.message || e);
      flash(e.message, true);
      setStatus(e.message, true);
    } finally {
      transferBusy = false;
    }
  });

  document.getElementById('btn-upload')?.addEventListener('click', async () => {
    if (transferBusy) return;
    transferBusy = true;
    try {
      if (usingWebSerial()) {
        await uploadWebSerial();
      } else if (usingHostSerial()) {
        await uploadHost();
      } else {
        flash(
          webSerialOk
            ? 'Connect host serial or Web Serial USB first.'
            : 'Click Connect on host serial first.',
          true,
        );
      }
    } catch (e) {
      console.error(LOG, 'upload failed', e);
      flash(e.message, true);
      setStatus(e.message, true);
    } finally {
      transferBusy = false;
    }
  });

  document.getElementById('btn-from-json')?.addEventListener('click', () => {
    try {
      const parsed = JSON.parse(rawJson.value || '{}');
      objectToForm(parsed);
      flash('Form updated from JSON.', false);
    } catch (e) {
      flash('Invalid JSON.', true);
    }
  });

  document.getElementById('btn-to-json')?.addEventListener('click', () => {
    const merged = formToObject();
    if (rawJson && rawJson.value.trim()) {
      try {
        Object.assign(merged, JSON.parse(rawJson.value));
      } catch (_) {
        /* use form only */
      }
    }
    rawJson.value = JSON.stringify(merged, null, 2);
    flash('JSON updated from form.', false);
  });

  connectBtn?.addEventListener('click', () => {
    connectWebSerial().catch((e) => {
      disconnectWebSerial();
      const msg =
        e.name === 'NotFoundError'
          ? 'No USB device selected.'
          : e.name === 'SecurityError'
            ? 'Web Serial blocked (open LED Tool in a top-level tab, or use host serial on the Pi).'
            : e.message || String(e);
      flash(msg, true);
      setStatus(msg, true);
    });
  });

  disconnectBtn?.addEventListener('click', () => {
    disconnectWebSerial();
    flash('Web Serial disconnected.', false);
  });

  refreshPortsBtn?.addEventListener('click', () => loadHostPorts());

  hostConnectBtn?.addEventListener('click', () => connectHostSerial());

  hostDisconnectBtn?.addEventListener('click', () => {
    disconnectHostSerial();
    flash('Host serial disconnected.', false);
  });

  window.addEventListener('beforeunload', () => {
    if (webClient) {
      webClient.disconnect();
    }
  });

  log('settings editor ready', { apiBase, webSerialOk });
  updateUi();
  loadHostPorts();
})();