import { NextResponse } from "next/server";
import { withApi } from "@/lib/api";
import { exportCsv, exportJson } from "@/lib/transfer";

/**
 * GET /api/v1/export?format=json|csv
 *
 * Vollständiger Export der eigenen Daten. JSON enthält zusätzlich Sichtungen
 * und Universen, CSV ist die schlanke Tabellenform für Tabellenkalkulationen.
 */
export const GET = withApi(async (request, user) => {
  const url = new URL(request.url);
  const format = url.searchParams.get("format") === "csv" ? "csv" : "json";
  const stamp = new Date().toISOString().slice(0, 10);

  if (format === "csv") {
    const csv = await exportCsv(user.id);
    return new NextResponse(csv, {
      headers: {
        "content-type": "text/csv; charset=utf-8",
        "content-disposition": `attachment; filename="flimmer-${stamp}.csv"`,
      },
    });
  }

  const data = await exportJson(user.id);
  return new NextResponse(JSON.stringify(data, null, 2), {
    headers: {
      "content-type": "application/json; charset=utf-8",
      "content-disposition": `attachment; filename="flimmer-${stamp}.json"`,
    },
  });
});