import type { FastifyPluginAsync } from 'fastify'
import { sql } from 'drizzle-orm'

export const healthRoutes: FastifyPluginAsync = async (app) => {
  // Intentionally public — no auth. Load balancers, Docker health checks, and monitoring need this.
  app.get('/health', async (request, reply) => {
    let dbStatus = 'disconnected'
    let redisStatus = 'disconnected'

    try {
      await app.db.execute(sql`SELECT 1`)
      dbStatus = 'connected'
    } catch (err) {
      request.log.error({ err }, 'Database health check failed')
    }

    try {
      const pong = await app.redis.ping()
      redisStatus = pong === 'PONG' ? 'connected' : 'disconnected'
    } catch (err) {
      request.log.error({ err }, 'Redis health check failed')
    }

    const healthy = dbStatus === 'connected' && redisStatus === 'connected'

    reply.status(healthy ? 200 : 503).send({
      status: healthy ? 'ok' : 'degraded',
      db: dbStatus,
      redis: redisStatus,
      timestamp: new Date().toISOString(),
    })
  })
}