package merkle_tree

func NextPowerOfTwo(n uint64) uint64 {
	if n == 0 {
		return 1
	}
	// http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
	n--
	n |= n >> 1
	n |= n >> 2
	n |= n >> 4
	n |= n >> 8
	n |= n >> 16
	n |= n >> 32
	n++

	return n
}

// GetDepth returns the depth of a merkle tree with a given number of nodes.
// The depth is defined as the number of levels in the tree, with the root
// node at level 0 and each child node at a level one greater than its parent.
// If the number of nodes is less than or equal to 1, the depth is 0.
func GetDepth(v uint64) uint8 {
	// If there are 0 or 1 nodes, the depth is 0.
	if v <= 1 {
		return 0
	}

	// Initialize the depth to 0.
	depth := uint8(0)

	// Divide the number of nodes by 2 until it is less than or equal to 1.
	// The number of iterations is the depth of the tree.
	for v > 1 {
		v >>= 1
		depth++
	}

	return depth
}