(() => {
  function initDashboardLiveUpdates() {
    // Optional live updates on dashboard
    if (!document.getElementById('tbl-displays')) return;

    const socket = io({ transports: ['websocket'], upgrade: false });
    socket.on('connect', () => {
      socket.emit('admin_join');
    });

    function updateRow(publicId, patch) {
      const row = document.querySelector(`tr[data-public-id="${publicId}"]`);
      if (!row) return;
      if (patch.is_online !== undefined) row.querySelector('.st').textContent = patch.is_online ? 'online' : 'offline';
      if (patch.last_seen) row.querySelector('.ls').textContent = patch.last_seen;
      if (patch.latency_ms !== undefined) row.querySelector('.lat').textContent = patch.latency_ms ? `${patch.latency_ms.toFixed(1)}ms` : '';
      if (patch.offset_ms !== undefined) row.querySelector('.off').textContent = patch.offset_ms ? `${patch.offset_ms.toFixed(1)}ms` : '';
    }

    socket.on('admin_snapshot', (msg) => {
      const live = msg.live || {};
      Object.keys(live).forEach(pid => updateRow(pid, { ...live[pid], is_online: true }));
    });

    socket.on('admin_display_update', (msg) => {
      updateRow(msg.public_id, msg);
    });

    socket.on('admin_event_triggered', (msg) => {
      const el = document.getElementById('active-event');
      if (!el) return;
      el.innerHTML = `<div><strong>${msg.event_name}</strong> (#${msg.event_id})</div><div>Start: <code>${msg.start_time_ms.toFixed(3)}</code></div>`;
    });
  }

  function initVideoUploadProgress() {
    const form = document.getElementById('video-upload-form');
    if (!form) return;

    const fileInput = form.querySelector('input[type="file"][name="file"]');
    const submitBtn = form.querySelector('button[type="submit"]');
    const progressWrap = document.getElementById('upload-progress');
    const progressBar = document.getElementById('upload-progress-bar') || (progressWrap ? progressWrap.querySelector('.progress-bar') : null);
    const statusEl = document.getElementById('upload-status');

    // Tiny boot indicator so it’s obvious the JS is active on this page.
    setStatus('Ready to upload.', 'form-text mt-2 text-muted');

    if (fileInput) {
      fileInput.addEventListener('change', () => {
        if (fileInput.files && fileInput.files.length > 0) {
          showProgress();
          setProgress(0, { indeterminate: false, variant: 'info' });
          setStatus(`Selected: ${fileInput.files[0].name}`, 'form-text mt-2 text-muted');
        }
      });
    }

    function setStatus(msg, cls) {
      if (!statusEl) return;
      statusEl.textContent = msg || '';
      statusEl.className = cls ? cls : 'form-text mt-2';
    }

    function showProgress() {
      if (!progressWrap) return;
      progressWrap.classList.remove('d-none');
      progressWrap.classList.add('d-block');
    }

    function setProgress(percent, opts = {}) {
      if (!progressWrap || !progressBar) return;
      const pct = Math.max(0, Math.min(100, Math.round(percent)));
      progressBar.setAttribute('aria-valuenow', String(pct));
      progressBar.style.width = `${pct}%`;
      progressBar.textContent = `${pct}%`;
      if (opts.indeterminate) {
        progressBar.classList.add('progress-bar-striped', 'progress-bar-animated');
      } else {
        progressBar.classList.remove('progress-bar-animated');
        // keep striped (optional) to make it visible
        progressBar.classList.add('progress-bar-striped');
      }
      if (opts.variant) {
        progressBar.classList.remove('bg-success', 'bg-danger', 'bg-warning', 'bg-info');
        progressBar.classList.add(`bg-${opts.variant}`);
      }
    }

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

      if (!fileInput || !fileInput.files || fileInput.files.length === 0) {
        setStatus('Please select a file to upload.', 'form-text mt-2 text-danger');
        return;
      }

      // Reset UI
      showProgress();
      setProgress(0, { indeterminate: true, variant: 'info' });
      setStatus('Uploading…', 'form-text mt-2');

      if (submitBtn) submitBtn.disabled = true;
      if (fileInput) fileInput.disabled = true;

      const xhr = new XMLHttpRequest();
      const targetUrl = form.getAttribute('action') || window.location.href;
      xhr.open('POST', targetUrl, true);

      xhr.upload.addEventListener('progress', (evt) => {
        if (!evt.lengthComputable) {
          setProgress(0, { indeterminate: true, variant: 'info' });
          return;
        }
        const percent = (evt.loaded / evt.total) * 100;
        setProgress(percent, { indeterminate: false, variant: 'info' });
      });

      xhr.upload.addEventListener('load', () => {
        // Upload bytes are done; server might still be processing.
        setProgress(100, { indeterminate: true, variant: 'info' });
        setStatus('Processing on server…', 'form-text mt-2');
      });

      xhr.addEventListener('load', () => {
        if (xhr.status >= 200 && xhr.status < 300) {
          setProgress(100, { indeterminate: false, variant: 'success' });
          setStatus('Upload complete. Redirecting…', 'form-text mt-2 text-success');
          window.location.assign(xhr.responseURL || targetUrl);
        } else {
          setProgress(100, { indeterminate: false, variant: 'danger' });
          setStatus(`Upload failed (HTTP ${xhr.status}).`, 'form-text mt-2 text-danger');
          if (submitBtn) submitBtn.disabled = false;
          if (fileInput) fileInput.disabled = false;
        }
      });

      xhr.addEventListener('error', () => {
        setProgress(100, { indeterminate: false, variant: 'danger' });
        setStatus('Upload failed (network error).', 'form-text mt-2 text-danger');
        if (submitBtn) submitBtn.disabled = false;
        if (fileInput) fileInput.disabled = false;
      });

      xhr.addEventListener('abort', () => {
        setProgress(0, { indeterminate: false, variant: 'warning' });
        setStatus('Upload aborted.', 'form-text mt-2 text-warning');
        if (submitBtn) submitBtn.disabled = false;
        if (fileInput) fileInput.disabled = false;
      });

      const data = new FormData(form);
      xhr.send(data);
    });
  }

  initDashboardLiveUpdates();
  initVideoUploadProgress();
})();