import { NextRequest, NextResponse } from "next/server";
import { auth } from "@/auth";
import { getMailSession } from "@/lib/mail-session";
import { getAttachment } from "@/lib/imap";

// GET /api/mail/messages/[uid]/attachments?folder=INBOX&filename=doc.pdf
export async function GET(
  req: NextRequest,
  { params }: { params: Promise<{ uid: string }> }
) {
  const session = await auth();
  if (!session) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });

  const creds = await getMailSession();
  if (!creds) return NextResponse.json({ error: "Mail oturumu yok" }, { status: 401 });

  const { uid } = await params;
  const folder = req.nextUrl.searchParams.get("folder") ?? "INBOX";
  const filename = req.nextUrl.searchParams.get("filename");

  if (!filename) {
    return NextResponse.json({ error: "Dosya adı gerekli" }, { status: 400 });
  }

  try {
    const att = await getAttachment(creds, folder, parseInt(uid), filename);
    if (!att) {
      return NextResponse.json({ error: "Ek bulunamadı" }, { status: 404 });
    }

    return new NextResponse(att.content, {
      headers: {
        "Content-Type": att.contentType,
        "Content-Disposition": `attachment; filename="${encodeURIComponent(filename)}"`,
        "Content-Length": String(att.content.length),
      },
    });
  } catch (err: any) {
    return NextResponse.json(
      { error: "Ek indirilemedi: " + (err?.message ?? "") },
      { status: 502 }
    );
  }
}