import { NextRequest, NextResponse } from "next/server";
import { getServerSession } from "next-auth";
import { authOptions } from "@/lib/auth";
import { requireActiveUser } from "@/lib/auth-guards";
import {
  ALLOWED_TRIP_IMAGE_MIME,
  MAX_TRIP_IMAGE_UPLOAD_BYTES,
  processAndSaveTripImage,
} from "@/lib/trip-image-storage";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

/**
 * Upload satu foto trip. Dipanggil dari form create-trip saat user memilih
 * file — gambar langsung dikompres & disimpan, route mengembalikan URL publik
 * yang nanti ikut disubmit bersama data trip.
 *
 * File yatim (di-upload tapi trip batal dibuat) dibersihkan cron
 * `/api/cron/cleanup-trip-images`.
 */
export async function POST(req: NextRequest) {
  const session = await getServerSession(authOptions);
  if (!session?.user) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }
  try {
    await requireActiveUser(session.user.id);
  } catch (err) {
    return NextResponse.json(
      { error: (err as Error).message },
      { status: 403 }
    );
  }

  let form: FormData;
  try {
    form = await req.formData();
  } catch {
    return NextResponse.json(
      { error: "Body bukan multipart/form-data" },
      { status: 400 }
    );
  }

  const file = form.get("file");
  if (!(file instanceof File)) {
    return NextResponse.json({ error: "File wajib diisi" }, { status: 400 });
  }
  if (!ALLOWED_TRIP_IMAGE_MIME.has(file.type)) {
    return NextResponse.json(
      { error: "Hanya menerima JPG, PNG, atau WebP" },
      { status: 415 }
    );
  }
  if (file.size > MAX_TRIP_IMAGE_UPLOAD_BYTES) {
    return NextResponse.json(
      { error: "Ukuran file maksimal 12MB" },
      { status: 413 }
    );
  }

  try {
    const buf = Buffer.from(await file.arrayBuffer());
    const saved = await processAndSaveTripImage(buf);
    return NextResponse.json({ url: saved.url, size: saved.size });
  } catch (err) {
    return NextResponse.json(
      { error: (err as Error).message || "Gagal memproses gambar" },
      { status: 400 }
    );
  }
}