import { getSupabaseAdmin } from '@/lib/supabase/admin';

export type AdminMetrics = {
  totalUsers: number;
  totalTunnels: number;
  activeTunnels: number;
  inactiveTunnels: number;
  overQuota: number;
  bytesUsedTotal: number;
  quotaTotal: number;
  signups7d: number;
  signups30d: number;
  recentlyActive: number;
};

type TunnelAgg = {
  is_active: boolean;
  bytes_used: number;
  quota_bytes: number;
  last_seen_at: string | null;
};

export async function computeMetrics(): Promise<AdminMetrics> {
  const admin = getSupabaseAdmin();

  const { data: tunnelsData } = await admin
    .from('tunnels')
    .select('is_active, bytes_used, quota_bytes, last_seen_at');
  const tunnels = (tunnelsData ?? []) as TunnelAgg[];

  const now = Date.now();
  const day = 24 * 60 * 60 * 1000;
  let activeTunnels = 0;
  let inactiveTunnels = 0;
  let overQuota = 0;
  let bytesUsedTotal = 0;
  let quotaTotal = 0;
  let recentlyActive = 0;
  for (const t of tunnels) {
    if (t.is_active) activeTunnels++;
    else inactiveTunnels++;
    if (t.quota_bytes > 0 && t.bytes_used >= t.quota_bytes) overQuota++;
    bytesUsedTotal += Number(t.bytes_used) || 0;
    quotaTotal += Number(t.quota_bytes) || 0;
    if (t.last_seen_at && now - new Date(t.last_seen_at).getTime() <= day) {
      recentlyActive++;
    }
  }

  let totalUsers = 0;
  let signups7d = 0;
  let signups30d = 0;
  const perPage = 1000;
  for (let page = 1; page <= 50; page++) {
    const { data, error } = await admin.auth.admin.listUsers({ page, perPage });
    if (error) break;
    const users = data.users;
    if (users.length === 0) break;
    totalUsers += users.length;
    for (const u of users) {
      const created = new Date(u.created_at).getTime();
      if (now - created <= 7 * day) signups7d++;
      if (now - created <= 30 * day) signups30d++;
    }
    if (users.length < perPage) break;
  }

  return {
    totalUsers,
    totalTunnels: tunnels.length,
    activeTunnels,
    inactiveTunnels,
    overQuota,
    bytesUsedTotal,
    quotaTotal,
    signups7d,
    signups30d,
    recentlyActive,
  };
}