/**
 * Lightweight counter/gauge registry merged into metrics_live and ctx hooks.
 */

/** @type {Map<string, number>} */
const counters = new Map()

/**
 * @param {string} name
 * @param {number} [delta]
 */
export function bareOsKernelMetricInc(name, delta = 1) {
  const k = String(name || '').trim().slice(0, 128)
  if (!k) return
  const d = Number.isFinite(delta) ? Math.floor(delta) : 1
  counters.set(k, (counters.get(k) || 0) + d)
}

/**
 * @param {string} name
 * @param {number} value
 */
export function bareOsKernelMetricSet(name, value) {
  const k = String(name || '').trim().slice(0, 128)
  if (!k) return
  const v = Number.isFinite(value) ? value : 0
  counters.set(k, v)
}

export function bareOsKernelMetricsSnapshot() {
  return Object.fromEntries([...counters.entries()].sort(([a], [b]) => a.localeCompare(b)))
}

export function bareOsKernelMetricsReset() {
  counters.clear()
}