// /health (JSON liveness/readiness) and /metrics (Prometheus exposition).

import { getRatings } from '../lib/imdbRatings.js';
import { imdbRatingsCount, registry } from '../lib/metrics.js';

export default async function healthRoutes(fastify) {
  fastify.get('/health', async (_req, reply) => {
    reply.header('Cache-Control', 'no-store');
    let ratings = 0;
    let ratingsOk = false;
    try {
      const map = await getRatings();
      ratings = map.size;
      imdbRatingsCount.set(ratings);
      ratingsOk = true;
    } catch {
      /* ignore — reported via ratingsOk */
    }
    const status = ratingsOk ? 'ok' : 'degraded';
    reply.code(ratingsOk ? 200 : 503);
    return {
      status,
      uptime: Math.round(process.uptime()),
      pid: process.pid,
      node: process.version,
      memory_mb: Math.round(process.memoryUsage().rss / 1024 / 1024),
      imdb_ratings: ratings,
    };
  });

  fastify.get('/metrics', async (_req, reply) => {
    reply.header('Content-Type', registry.contentType);
    return registry.metrics();
  });
}