// Reactive "telemetry" helper: returns an object whose .value drifts around a
// base value on an interval, so static dummy data feels like a live readout.
// Call inside a component's script (it registers an $effect for cleanup).

export function useJitter(base, { amp = 1, decimals = 0, every = 2000 } = {}) {
  let value = $state(base)

  $effect(() => {
    const id = setInterval(() => {
      const delta = (Math.random() - 0.5) * 2 * amp
      value = Number((base + delta).toFixed(decimals))
    }, every)
    return () => clearInterval(id)
  })

  return { get value() { return value } }
}