export default defineEventHandler(async () => {
  const db = await getDb();
  const collection = db.collection("requests");

  const now = new Date();
  const last24h = new Date(now.getTime() - 24 * 60 * 60 * 1000);
  const last7d = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
  const last30d = new Date(now.getTime() - 30 * 24 * 60 * 60 * 1000);

  const [totalRequests24h, totalRequests7d, totalRequests30d, uniqueIPs, topIPs, requestsByHour] =
    await Promise.all([
      collection.countDocuments({ timestamp: { $gte: last24h.toISOString() } }),
      collection.countDocuments({ timestamp: { $gte: last7d.toISOString() } }),
      collection.countDocuments({ timestamp: { $gte: last30d.toISOString() } }),
      collection
        .distinct("ip", { timestamp: { $gte: last24h.toISOString() } })
        .then((ips) => ips.length),
      collection
        .aggregate([
          { $match: { timestamp: { $gte: last24h.toISOString() } } },
          {
            $group: {
              _id: "$ip",
              count: { $sum: 1 },
              lastSeen: { $max: "$timestamp" },
            },
          },
          { $sort: { count: -1 } },
          { $limit: 20 },
          { $project: { _id: 0, ip: "$_id", count: 1, lastSeen: 1 } },
        ])
        .toArray(),
      collection
        .aggregate([
          { $match: { timestamp: { $gte: last24h.toISOString() } } },
          {
            $group: {
              _id: { $substr: ["$timestamp", 11, 2] },
              count: { $sum: 1 },
            },
          },
          { $sort: { _id: 1 } },
          { $project: { _id: 0, hour: "$_id", count: 1 } },
        ])
        .toArray(),
    ]);

  return {
    totalRequests: { last24h: totalRequests24h, last7d: totalRequests7d, last30d: totalRequests30d },
    uniqueIPs,
    topIPs,
    requestsByHour,
  };
});