import { withUser } from "@/lib/api";
import { usageRecordsForExport, usageCsv, usageQueryFromUrl } from "@/lib/usage/service";

export const dynamic = "force-dynamic";

/** GET /api/usage/export.csv?<same params as /api/usage> → `text/csv` attachment of the raw usage records (max 50 000 rows). */
export const GET = withUser(async ({ req, user }) => {
  const { range, rows } = await usageRecordsForExport(user.id, usageQueryFromUrl(req.url));
  const from = range.from ? range.from.toISOString().slice(0, 10) : "all";
  const to = new Date(range.to.getTime() - 1).toISOString().slice(0, 10);
  const body = usageCsv(rows);
  return new Response(body, {
    status: 200,
    headers: {
      "Content-Type": "text/csv; charset=utf-8",
      "Content-Disposition": `attachment; filename="polyllm-usage-${from}_${to}.csv"`,
      "Cache-Control": "no-store",
      "X-Row-Count": String(rows.length),
    },
  });
});