zeropost-tool/app/api/admin/usage/summary/route.js

import { NextResponse } from 'next/server';
import { requireAdmin } from '@/lib/session';
import { engine } from '@/lib/engine';

// GET /api/admin/usage/summary?range=today&group_by=service
export async function GET(req) {
  const admin = await requireAdmin();
  if (!admin) return NextResponse.json({ error: 'Forbidden' }, { status: 403 });
  try {
    const { searchParams } = new URL(req.url);
    const params = {};
    if (searchParams.get('range'))    params.range = searchParams.get('range');
    if (searchParams.get('group_by')) params.group_by = searchParams.get('group_by');
    if (searchParams.get('service'))  params.service = searchParams.get('service');
    const data = await engine.usageSummary(params);
    return NextResponse.json(data);
  } catch (err) {
    return NextResponse.json({ error: err.message }, { status: err.status || 500 });
  }
}