import { NextRequest, NextResponse } from "next/server";
import { sql } from "@/lib/db";
import { cacheDel } from "@/lib/cache";
import { getValhallaQueue } from "@/lib/queue";

export const runtime = "nodejs";

export async function DELETE(
  _req: NextRequest,
  { params }: { params: Promise<{ slug: string }> },
) {
  const { slug } = await params;

  const result = await Promise.resolve(sql`
    DELETE FROM cities WHERE slug = ${slug} RETURNING slug
  `);

  if (result.length === 0) {
    return NextResponse.json({ error: "City not found" }, { status: 404 });
  }

  // Invalidate all caches for this city
  await Promise.all([
    cacheDel("api:cities:*"),
    cacheDel(`api:grid:*${slug}*`),
    cacheDel(`api:pois:*${slug}*`),
    cacheDel(`api:stats:*${slug}*`),
  ]);

  // Remove city from the global Valhalla routing tile set.
  // The valhalla-worker will delete the city's clipped PBF and rebuild
  // tiles from all remaining cities' PBFs in one pass.
  const valhallaQueue = getValhallaQueue();
  await valhallaQueue.add(
    "build-valhalla",
    { type: "build-valhalla", removeSlugs: [slug] },
    { attempts: 1, removeOnComplete: { age: 86400 } },
  );

  return NextResponse.json({ deleted: slug });
}