import { NextRequest, NextResponse } from "next/server";
import { runCron } from "@/lib/cron-runner";
import { prisma } from "@/lib/prisma";
import {
  deleteTripImage,
  listTripImageNames,
  tripImageMtime,
  TRIP_IMAGE_URL_PREFIX,
} from "@/lib/trip-image-storage";

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

/** File yang lebih tua dari ini & tak direferensikan DB dianggap yatim. */
const ORPHAN_AGE_MS = 24 * 60 * 60 * 1000;

/**
 * Cron — hapus file gambar trip yatim.
 *
 * Form create-trip multi-step mengunggah foto SEBELUM trip tersimpan; kalau
 * user menutup form di tengah jalan, file menggantung di disk tanpa pernah
 * jadi `TripImage`. Sweep ini menghapus file >24 jam yang tidak direferensikan
 * `TripImage` mana pun. Idempotent — aman dijalankan berulang.
 *
 * Trigger: lihat docs/CRON_SETUP.md. Header wajib `Authorization: Bearer ${CRON_SECRET}`.
 */
export async function GET(req: NextRequest) {
  const secret = process.env.CRON_SECRET;
  if (!secret) {
    console.error("[cron/cleanup-trip-images] CRON_SECRET tidak di-set");
    return NextResponse.json(
      { error: "Server misconfigured" },
      { status: 500 }
    );
  }
  if (req.headers.get("authorization") !== `Bearer ${secret}`) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  const outcome = await runCron("cleanup-trip-images", async () => {
    const names = await listTripImageNames();
    if (names.length === 0) return { scanned: 0, deleted: 0 };

    const referenced = await prisma.tripImage.findMany({
      where: { url: { startsWith: TRIP_IMAGE_URL_PREFIX } },
      select: { url: true },
    });
    const referencedNames = new Set(
      referenced.map((r) => r.url.slice(TRIP_IMAGE_URL_PREFIX.length))
    );

    const now = Date.now();
    let deleted = 0;
    for (const name of names) {
      if (referencedNames.has(name)) continue;
      const mtime = await tripImageMtime(name);
      // File baru di-upload tapi trip belum tersimpan → beri tenggang 24 jam.
      if (!mtime || now - mtime.getTime() < ORPHAN_AGE_MS) continue;
      await deleteTripImage(name);
      deleted++;
    }
    return { scanned: names.length, deleted };
  });

  if (!outcome.ok) {
    console.error("[cron/cleanup-trip-images] gagal", outcome.error);
    return NextResponse.json(
      { error: "Gagal menjalankan cleanup" },
      { status: 500 }
    );
  }
  console.log("[cron/cleanup-trip-images] selesai", outcome.payload);
  return NextResponse.json({ ok: true, ...outcome.payload });
}