function filterTable(searchInputId, tableId) {
  const filter = document.getElementById(searchInputId).value.toUpperCase();
  const rows   = document.getElementById(tableId).getElementsByTagName("tr");

  for (let i = 1; i < rows.length; i++) {
    rows[i].style.display = "none";
    for (const cell of rows[i].getElementsByTagName("td")) {
      if ((cell.textContent || cell.innerText).toUpperCase().includes(filter)) {
        rows[i].style.display = "";
        break;
      }
    }
  }
}

function sortTable(tableId, columnIndex, th) {
  const tbody   = document.getElementById(tableId).tBodies[0];
  const rows    = Array.from(tbody.rows);
  const headers = Array.from(th.parentNode.children);

  headers.forEach(h => h !== th && (h.className = "", h.dataset.sortState = "none"));

  const state    = th.dataset.sortState || "none";
  const newState = state === "none" ? "asc" : state === "asc" ? "desc" : "none";
  th.dataset.sortState = newState;
  th.className = newState !== "none" ? newState : "";

  if (newState === "none") {
    rows.sort((a, b) => a.dataset.index - b.dataset.index);
  } else {
    rows.sort((a, b) => {
      const aTxt = a.cells[columnIndex].textContent.trim();
      const bTxt = b.cells[columnIndex].textContent.trim();
      const aNum = parseFloat(aTxt.replace(/[^0-9.-]/g, ""));
      const bNum = parseFloat(bTxt.replace(/[^0-9.-]/g, ""));
      const numeric = !isNaN(aNum) && !isNaN(bNum);
      const cmp = numeric ? aNum - bNum : aTxt.localeCompare(bTxt, undefined, { numeric: true });
      return newState === "asc" ? cmp : -cmp;
    });
  }
  rows.forEach(r => tbody.appendChild(r));
}

async function loadBgpTables() {
  const ipv4Sum  = document.getElementById("ipv4Summary");
  const ipv6Sum  = document.getElementById("ipv6Summary");
  const ipv4Body = document.getElementById("ipv4TableBody");
  const ipv6Body = document.getElementById("ipv6TableBody");

  try {
    const res  = await fetch("/bgp/json");
    const data = await res.json();

    ipv4Sum.innerHTML = buildSummary("IPv4", data.ipv4_info);
    ipv6Sum.innerHTML = buildSummary("IPv6", data.ipv6_info);

    renderPeers(ipv4Body, data.ipv4_peers);
    renderPeers(ipv6Body, data.ipv6_peers);

    activatePopovers();
  } catch (e) {
    showError(ipv4Sum, ipv4Body, "IPv4");
    showError(ipv6Sum, ipv6Body, "IPv6");
  }
}

function buildSummary(label, info) {
  const popContent = `
    <strong>BGP Router ID:</strong> ${info.router_id}<br>
    <strong>Local AS:</strong> <a href='https://bgp.tools/search?q=${info.local_as}' target='_blank'>${info.local_as}</a><br>
    <strong>VRF ID:</strong> ${info.vrf_id}<br>
    <strong>RIB Entries:</strong> ${info.rib_entries} (using ${info.rib_memory})<br>
    <strong>Peers:</strong> ${info.peers} (using ${info.peers_memory})<br>
    <strong>BGP Table Version:</strong> ${info.table_version}
  `.trim();

  return `
    <h2 class="d-inline me-2">${label} Unicast Summary</h2>
    <span tabindex="0" role="button" class="info-icon"
          data-bs-toggle="popover" data-bs-trigger="hover focus"
          data-bs-html="true" data-bs-title="${label} Summary Info"
          data-bs-content="${popContent}">
          ℹ️
    </span>
    <div class="mt-1"><strong>Peers:</strong> ${info.peers}</div>
  `;
}


function renderPeers(tbody, peers) {
  tbody.innerHTML = "";
  if (!peers.length) {
    tbody.innerHTML = `<tr><td colspan="7" class="text-center">No data available.</td></tr>`;
    return;
  }

  peers.forEach((p, i) => {
    const popTitle   = `<a href="https://bgp.tools/search?q=${p.as_number}" target="_blank" rel="noopener noreferrer">${p.as_number}</a> details<a>`;
    const popContent = `
      Messages Received: ${p.msg_received}<br>
      Messages Sent: ${p.msg_sent}<br>
      Inbound Queue: ${p.in_queue}<br>
      Outbound Queue: ${p.out_queue}
    `.trim();

    const tr = document.createElement("tr");
    tr.dataset.index = i;
    tr.innerHTML = `
      <td>${p.neighbor}</td>
      <td><a href="https://bgp.tools/search?q=${p.as_number}" target="_blank">${p.as_number}</a></td>
      <td>${p.up_down}</td>
      <td>${p.state_pfx_rcd}</td>
      <td>${p.prefix_sent}</td>
      <td>${p.description}</td>
      <td>
        <span tabindex="0" role="button" class="info-icon"
              data-bs-toggle="popover" data-bs-trigger="hover focus"
              data-bs-html="true" data-bs-title='${popTitle}'
              data-bs-content="${popContent}">
              ℹ️
        </span>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function activatePopovers() {
  document.querySelectorAll('[data-bs-toggle="popover"]').forEach(el => {
    const existing = bootstrap.Popover.getInstance(el);
    if (existing) existing.dispose();
    new bootstrap.Popover(el);
  });
}

function showError(sumEl, bodyEl, label) {
  sumEl.textContent = `Error fetching ${label} data.`;
  bodyEl.innerHTML  = `<tr><td colspan="7" class="text-center text-danger">Error retrieving data.</td></tr>`;
}

function refreshBGPTable() {
  ["ipv4Search", "ipv6Search"].forEach(id => (document.getElementById(id).value = ""));
  toggleRefresh(true);
  loadBgpTables().finally(() => toggleRefresh(false));
}

function toggleRefresh(loading) {
  document.getElementById("refreshIcon").classList.toggle("d-none", loading);
  document.getElementById("refreshSpinner").classList.toggle("d-none", !loading);
  document.getElementById("refreshIcon2").classList.toggle("d-none", loading);
  document.getElementById("refreshSpinner2").classList.toggle("d-none", !loading);
}

document.addEventListener("DOMContentLoaded", loadBgpTables);