const { fetchPeeringDB } = require("../services/peeringdb");

// IX Detail endpoint: /api/ix/detail?ix_id=X
async function handleIxDetail(req, res, url) {
    const ixId = (url.searchParams.get("ix_id") || "").replace(/[^0-9]/g, "");
    if (!ixId) {
      res.writeHead(400);
      return res.end(JSON.stringify({ error: "Missing ix_id parameter" }));
    }
    const start = Date.now();
    try {
      const [ixData, ixlanData] = await Promise.all([
        fetchPeeringDB("/ix/" + ixId),
        fetchPeeringDB("/ixlan?ix_id=" + ixId),
      ]);

      const ix = ixData?.data?.[0] || {};
      const ixlans = ixlanData?.data || [];
      const ixlanId = ixlans.length > 0 ? ixlans[0].id : null;

      let members = [];
      if (ixlanId) {
        const netixlanData = await fetchPeeringDB("/netixlan?ixlan_id=" + ixlanId);
        members = (netixlanData?.data || []).map(m => ({
          asn: m.asn,
          name: m.name || "",
          speed_mbps: m.speed || 0,
          speed_display: (m.speed || 0) >= 1000 ? ((m.speed || 0) / 1000) + " Gbps" : (m.speed || 0) + " Mbps",
          ipv4: m.ipaddr4 || null,
          ipv6: m.ipaddr6 || null,
        }));
      }

      // Sort by speed desc for top members
      const sorted = members.slice().sort((a, b) => b.speed_mbps - a.speed_mbps);

      const duration = Date.now() - start;
      return res.end(JSON.stringify({
        meta: { duration_ms: duration, timestamp: new Date().toISOString() },
        ix: {
          id: parseInt(ixId),
          name: ix.name || "",
          city: ix.city || "",
          country: ix.country || "",
          website: ix.website || "",
          peeringdb_url: "https://www.peeringdb.com/ix/" + ixId,
        },
        total_members: members.length,
        top_members_by_speed: sorted.slice(0, 20),
        all_members: sorted,
      }, null, 2));
    } catch (err) {
      res.writeHead(500);
      return res.end(JSON.stringify({ error: "IX detail failed", message: err.message }));
    }

}

module.exports = { handleIxDetail };