package world

func (w *World) candSeenResetIfOverflow() {
	w.candEpoch++
	if w.candEpoch != 0 {
		return
	}
	// overflow: reset stamp array
	for i := range w.candStamp {
		w.candStamp[i] = 0
	}
	w.candEpoch = 1
}

func (w *World) candSeenMark(id PrimitiveID) bool {
	// ensure stamp capacity
	uid := uint32(id)
	if int(uid) >= len(w.candStamp) {
		// grow to next power-ish
		n := len(w.candStamp)
		if n == 0 {
			n = 1024
		}
		for n <= int(uid) {
			n *= 2
		}
		ns := make([]uint32, n)
		copy(ns, w.candStamp)
		w.candStamp = ns
	}
	if w.candStamp[uid] == w.candEpoch {
		return true
	}
	w.candStamp[uid] = w.candEpoch
	return false
}