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);
            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 = summaryHtml(data.ipv4_info);
        ipv6Sum.innerHTML = summaryHtml(data.ipv6_info);

        renderPeers(ipv4Body, data.ipv4_peers, "ipv4Table");
        renderPeers(ipv6Body, data.ipv6_peers, "ipv6Table");

        bootstrap.Popover.getInstance(document.body)?.dispose?.();
        document.querySelectorAll('[data-bs-toggle="popover"]').forEach(el => new bootstrap.Popover(el));

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

function summaryHtml(info) {
    return `
        <p>BGP Router ID: ${info.router_id},
           Local AS: <a href="https://bgp.tools/search?q=${info.local_as}" target="_blank">${info.local_as}</a>,
           VRF ID: ${info.vrf_id}</p>
        <p>${info.rib_entries} RIB Entries, using ${info.rib_memory}</p>
        <p>${info.peers} Peers, using ${info.peers_memory}</p>
        <p>BGP Table Version: ${info.table_version}</p>
    `;
}

function renderPeers(tbody, peers, tableId) {
    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>${p.description}</td>
            <td>
              <span tabindex="0" role="button" class="info-icon"
                    data-bs-toggle="popover"
                    data-bs-trigger="focus"
                    data-bs-html="true"
                    data-bs-title='${popTitle}'
                    data-bs-content="${popContent}">
                    ℹ️
              </span>
            </td>
        `;
        tbody.appendChild(tr);
    });
}


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);