/**
 * PM2 config for blut24-landing. Deployed to /var/www/blut24.com/ecosystem.config.cjs
 * — i.e. it lives OUTSIDE the release directories, so it survives every deploy.
 *
 * Zero-downtime hinges on two details here:
 *
 * 1. `script` points through the `current` SYMLINK, never at a release path. deploy.sh
 *    swaps that symlink and then runs `pm2 reload`; each worker PM2 spawns resolves
 *    the symlink afresh and therefore boots the NEW release.
 *
 * 2. `exec_mode: 'cluster'` — only cluster mode gives a rolling reload (spawn the
 *    replacement, wait for it, then retire the old one). In fork mode `pm2 reload`
 *    degrades to a stop/start and drops requests.
 */
const fs = require('fs')
const path = require('path')

// ISPConfig-managed host: code lives in the site's docroot (nginx proxies, so
// nothing here is ever served as a file); secrets and the SQLite databases live
// in the site's private/ dir, OUTSIDE the docroot.
const APP_ROOT = '/var/www/blut24.com/web'
const SHARED_ROOT = '/var/www/blut24.com/private/blut24-landing'

/** Read shared/.env into an object. Parsed here so a deploy picks up env changes
 *  on `pm2 reload --update-env` without editing this file. */
function loadEnvFile(file) {
  const out = {}
  if (!fs.existsSync(file)) return out
  for (const raw of fs.readFileSync(file, 'utf8').split('\n')) {
    const line = raw.trim()
    if (!line || line.startsWith('#')) continue
    const eq = line.indexOf('=')
    if (eq < 0) continue
    let val = line.slice(eq + 1).trim()
    if ((val.startsWith('"') && val.endsWith('"')) || (val.startsWith("'") && val.endsWith("'"))) {
      val = val.slice(1, -1)
    }
    out[line.slice(0, eq).trim()] = val
  }
  return out
}

const env = loadEnvFile(path.join(SHARED_ROOT, 'shared', '.env'))

module.exports = {
  apps: [
    {
      name: 'blut24-landing',
      script: path.join(APP_ROOT, 'current', '.output', 'server', 'index.mjs'),
      cwd: path.join(APP_ROOT, 'current'),
      exec_mode: 'cluster',
      // Two workers so a reload always has a live one serving. SQLite stays safe
      // because registrations.db runs in WAL with a busy_timeout, and clinics.db
      // is opened query_only.
      instances: 2,
      interpreter: '/root/.nvm/versions/node/v22.22.3/bin/node',
      max_memory_restart: '512M',
      // Give a worker time to bind before PM2 retires its predecessor.
      listen_timeout: 10000,
      kill_timeout: 5000,
      // Never let a crash-looping bad build hammer the box; deploy.sh health-checks
      // and rolls back, this is just the backstop.
      max_restarts: 10,
      restart_delay: 2000,
      out_file: path.join(SHARED_ROOT, 'logs', 'out.log'),
      error_file: path.join(SHARED_ROOT, 'logs', 'error.log'),
      merge_logs: true,
      time: true,
      env: {
        NODE_ENV: 'production',
        NITRO_PORT: env.NITRO_PORT || '3002',
        NITRO_HOST: env.NITRO_HOST || '127.0.0.1',
        ...env,
      },
    },
  ],
}