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

export const runtime = "nodejs";

const GEOFABRIK_URL_PATTERN =
  /^https:\/\/download\.geofabrik\.de\/[\w][\w/-]+-latest\.osm\.pbf$/;

export async function GET() {
  const rows = await Promise.resolve(sql<{
    slug: string;
    name: string;
    country_code: string;
    geofabrik_url: string;
    status: string;
    last_ingested: string | null;
    poi_count: number;
    grid_count: number;
    error_message: string | null;
  }[]>`
    SELECT
      c.slug,
      c.name,
      c.country_code,
      c.geofabrik_url,
      c.status,
      c.last_ingested,
      c.error_message,
      COALESCE(p.poi_count, 0)::int   AS poi_count,
      COALESCE(g.grid_count, 0)::int  AS grid_count
    FROM cities c
    LEFT JOIN (
      SELECT city_slug, COUNT(*) AS poi_count FROM raw_pois GROUP BY city_slug
    ) p ON p.city_slug = c.slug
    LEFT JOIN (
      SELECT city_slug, COUNT(*) AS grid_count FROM grid_points GROUP BY city_slug
    ) g ON g.city_slug = c.slug
    ORDER BY c.name
  `);

  return NextResponse.json(rows);
}

export async function POST(req: NextRequest) {
  let body: Record<string, unknown>;
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
  }

  const { name, slug, countryCode, geofabrikUrl, resolutionM = 200, bbox } = body;

  if (typeof slug !== "string" || !/^[a-z0-9-]+$/.test(slug)) {
    return NextResponse.json(
      { error: "slug must be lowercase alphanumeric with hyphens" },
      { status: 400 },
    );
  }

  if (typeof geofabrikUrl !== "string" || !GEOFABRIK_URL_PATTERN.test(geofabrikUrl)) {
    return NextResponse.json(
      { error: "geofabrikUrl must be a valid Geofabrik PBF URL" },
      { status: 400 },
    );
  }

  // Validate optional bbox [minLng, minLat, maxLng, maxLat]
  let validBbox: [number, number, number, number] | null = null;
  if (bbox !== undefined) {
    if (
      !Array.isArray(bbox) ||
      bbox.length !== 4 ||
      !bbox.every((v: unknown) => typeof v === "number" && isFinite(v))
    ) {
      return NextResponse.json(
        { error: "bbox must be [minLng, minLat, maxLng, maxLat] with numeric values" },
        { status: 400 },
      );
    }
    const [minLng, minLat, maxLng, maxLat] = bbox as [number, number, number, number];
    if (minLng >= maxLng || minLat >= maxLat) {
      return NextResponse.json(
        { error: "bbox: minLng must be < maxLng and minLat must be < maxLat" },
        { status: 400 },
      );
    }
    validBbox = [minLng, minLat, maxLng, maxLat];
  }

  if (validBbox) {
    const [minLng, minLat, maxLng, maxLat] = validBbox;
    await Promise.resolve(sql`
      INSERT INTO cities (slug, name, country_code, geofabrik_url, bbox, status)
      VALUES (
        ${slug as string},
        ${(name as string) ?? slug},
        ${(countryCode as string) ?? ""},
        ${geofabrikUrl},
        ST_MakeEnvelope(${minLng}, ${minLat}, ${maxLng}, ${maxLat}, 4326),
        'pending'
      )
      ON CONFLICT (slug) DO UPDATE
        SET status = 'pending',
            geofabrik_url = EXCLUDED.geofabrik_url,
            bbox = EXCLUDED.bbox,
            error_message = NULL
    `);
  } else {
    await Promise.resolve(sql`
      INSERT INTO cities (slug, name, country_code, geofabrik_url, status)
      VALUES (
        ${slug as string},
        ${(name as string) ?? slug},
        ${(countryCode as string) ?? ""},
        ${geofabrikUrl},
        'pending'
      )
      ON CONFLICT (slug) DO UPDATE
        SET status = 'pending',
            geofabrik_url = EXCLUDED.geofabrik_url,
            error_message = NULL
    `);
  }

  const queue = getPipelineQueue();
  const job = await queue.add(
    "refresh-city",
    {
      type: "refresh-city",
      citySlug: slug as string,
      geofabrikUrl,
      resolutionM: resolutionM as number,
    },
    JOB_OPTIONS["refresh-city"],
  );

  // Invalidate city list cache
  await cacheDel("api:cities:*");

  return NextResponse.json({ citySlug: slug, jobId: job.id }, { status: 202 });
}