import { NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/db";
import * as XLSX from "xlsx";

export async function GET(
  req: NextRequest,
  { params }: { params: Promise<{ jobId: string }> }
) {
  try {
    const { jobId } = await params;
    const job = await prisma.job.findUnique({
      where: { id: jobId },
      include: { results: { orderBy: { createdAt: "asc" } } },
    });

    if (!job) return NextResponse.json({ error: "Job not found" }, { status: 404 });

    const rows = job.results.map(r => ({
      "Unternehmen": r.companyName || "",
      "Domain": r.domain || "",
      "Kontaktname": r.contactName || "",
      "Position": r.contactTitle || "",
      "E-Mail": r.email || "",
    }));

    const ws = XLSX.utils.json_to_sheet(rows);
    const wb = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(wb, ws, "Leads");
    const arr = XLSX.write(wb, { type: "array", bookType: "xlsx" });

    return new NextResponse(new Uint8Array(arr), {
      headers: {
        "Content-Type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
        "Content-Disposition": `attachment; filename="onyva-leads-${job.type}-${jobId.slice(0, 8)}.xlsx"`,
      },
    });
  } catch (err) {
    console.error("GET /api/export/[jobId] error:", err);
    return NextResponse.json({ error: "Failed to export" }, { status: 500 });
  }
}