const scanButton = document.querySelector('#scanButton');
const buttonText = document.querySelector('#buttonText');
const results = document.querySelector('#results');
const empty = document.querySelector('#empty');
const errorBox = document.querySelector('#error');
const list = document.querySelector('#cameraList');
const title = document.querySelector('#resultTitle');
const meta = document.querySelector('#scanMeta');
const errorText = document.querySelector('#errorText');
const exportButton = document.querySelector('#exportCsvButton');
const actionStatus = document.querySelector('#actionStatus');
let currentCameras = [];

function hidePanels() {
  results.hidden = true;
  empty.hidden = true;
  errorBox.hidden = true;
  actionStatus.textContent = '';
}

function cameraCard(camera) {
  const article = document.createElement('article');
  article.className = 'camera';

  const details = document.createElement('div');
  const key = document.createElement('div');
  key.className = 'camera-key';
  key.textContent = camera.alta_key;
  const host = document.createElement('a');
  host.className = 'camera-host';
  host.href = camera.web_ui_url;
  host.target = '_blank';
  host.rel = 'noopener noreferrer';
  host.textContent = camera.hostname;
  host.title = 'Open camera Web UI';
  details.append(key, host);

  const network = document.createElement('div');
  network.className = 'network-data';
  const ip = document.createElement('span');
  ip.className = 'camera-ip';
  ip.textContent = camera.ip_address;
  const networkLabel = document.createElement('span');
  networkLabel.className = 'network-label';
  networkLabel.textContent = 'HTTPS · mDNS';
  network.append(ip, networkLabel);

  const copy = document.createElement('button');
  copy.className = 'copy-button';
  copy.type = 'button';
  copy.dataset.altaKey = camera.alta_key;
  copy.textContent = 'Copy key';
  copy.setAttribute('aria-label', `Copy Alta Key ${camera.alta_key}`);

  article.append(details, network, copy);
  return article;
}

async function copyText(text) {
  if (window.altaDiscovery) {
    await window.altaDiscovery.copyText(text);
    return;
  }
  if (navigator.clipboard && window.isSecureContext) {
    await navigator.clipboard.writeText(text);
    return;
  }
  const textarea = document.createElement('textarea');
  textarea.value = text;
  textarea.setAttribute('readonly', '');
  textarea.style.position = 'fixed';
  textarea.style.opacity = '0';
  document.body.append(textarea);
  textarea.select();
  const copied = document.execCommand('copy');
  textarea.remove();
  if (!copied) throw new Error('Clipboard access was blocked by the browser.');
}

list.addEventListener('click', async (event) => {
  const copyButton = event.target.closest('.copy-button');
  if (!copyButton) return;
  try {
    await copyText(copyButton.dataset.altaKey);
    copyButton.textContent = 'Copied';
    copyButton.classList.add('copied');
    actionStatus.textContent = `${copyButton.dataset.altaKey} copied to clipboard.`;
    window.setTimeout(() => {
      copyButton.textContent = 'Copy key';
      copyButton.classList.remove('copied');
    }, 1800);
  } catch (error) {
    actionStatus.textContent = error.message;
  }
});

exportButton.addEventListener('click', async () => {
  if (window.altaDiscovery) {
    try {
      const result = await window.altaDiscovery.exportCsv();
      actionStatus.textContent = result.canceled ? 'CSV export canceled.' : 'CSV exported successfully.';
    } catch (error) {
      actionStatus.textContent = error.message;
    }
    return;
  }
  const csv = AltaExportUtils.buildCsv(currentCameras);
  const blob = new Blob([csv], { type: 'text/csv;charset=utf-8' });
  const url = URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.href = url;
  link.download = 'alta-camera-keys.csv';
  document.body.append(link);
  link.click();
  link.remove();
  URL.revokeObjectURL(url);
  actionStatus.textContent = 'CSV exported with Alta Keys and camera Web UI URLs.';
});

scanButton.addEventListener('click', async () => {
  hidePanels();
  currentCameras = [];
  scanButton.disabled = true;
  scanButton.classList.add('scanning');
  buttonText.textContent = 'Scanning…';
  try {
    let data;
    if (window.altaDiscovery) {
      data = await window.altaDiscovery.scan();
    } else {
      const response = await fetch('/api/scan', { cache: 'no-store' });
      data = await response.json();
      if (!response.ok) throw new Error(data.error || 'The scanner returned an error.');
    }
    if (!data.ok) throw new Error(data.error || 'The scanner returned an error.');
    currentCameras = data.cameras;
    if (!currentCameras.length) {
      empty.hidden = false;
    } else {
      list.replaceChildren(...currentCameras.map(cameraCard));
      title.textContent = `${data.count} camera${data.count === 1 ? '' : 's'} found`;
      meta.textContent = `Scan completed in ${data.duration_seconds}s`;
      results.hidden = false;
    }
  } catch (error) {
    errorText.textContent = error.message;
    errorBox.hidden = false;
  } finally {
    scanButton.disabled = false;
    scanButton.classList.remove('scanning');
    buttonText.textContent = 'Discover again';
  }
});