"k8s.io/utils/ptr"
)

type topologyPair struct {
	key   string
	value string
}

// topologySpreadConstraint is an internal version for v1.TopologySpreadConstraint
// and where the selector is parsed.
// Fields are exported for comparison during testing.
type topologySpreadConstraint struct {
	MaxSkew            int32
	TopologyKey        string
	Selector           labels.Selector
	MinDomains         int32

	// deduced from the Pod's membership to Services, ReplicationControllers,
	// ReplicaSets or StatefulSets.
	// When not empty, .defaultingType must be "List".
	DefaultConstraints []v1.TopologySpreadConstraint

	// DefaultingType determines how .defaultConstraints are deduced. Can be one
	// of "System" or "List".
	//
	// - "System": Use kubernetes defined constraints that spread Pods among
	//   Nodes and Zones.