import { NextResponse } from "next/server";
import { sql } from "@/lib/db";
import { cacheGet, cacheSet } from "@/lib/cache";
import type { City } from "@transportationer/shared";

export const runtime = "nodejs";

export async function GET() {
  const cacheKey = "api:cities:all";
  const cached = await cacheGet<City[]>(cacheKey);
  if (cached) {
    return NextResponse.json(cached, { headers: { "X-Cache": "HIT" } });
  }

  const rows = await Promise.resolve(sql<{
    slug: string;
    name: string;
    country_code: string;
    geofabrik_url: string;
    bbox_arr: number[] | null;
    status: string;
    last_ingested: string | null;
  }[]>`
    SELECT
      slug,
      name,
      country_code,
      geofabrik_url,
      CASE WHEN bbox IS NOT NULL THEN ARRAY[
        ST_XMin(bbox)::float,
        ST_YMin(bbox)::float,
        ST_XMax(bbox)::float,
        ST_YMax(bbox)::float
      ] END AS bbox_arr,
      status,
      last_ingested
    FROM cities
    ORDER BY name
  `);

  const cities: City[] = rows.map((r) => ({
    slug: r.slug,
    name: r.name,
    countryCode: r.country_code,
    geofabrikUrl: r.geofabrik_url,
    bbox: (r.bbox_arr as [number, number, number, number]) ?? [0, 0, 0, 0],
    status: r.status as City["status"],
    lastIngested: r.last_ingested,
  }));

  await cacheSet(cacheKey, cities, "API_CITIES");
  return NextResponse.json(cities);
}