const GroupName = "policy"

const (
	PDBV1beta1Label = "pdb.kubernetes.io/deprecated-v1beta1-empty-selector-match"
)

var (
	NonV1beta1MatchAllSelector  = &metav1.LabelSelector{}
	NonV1beta1MatchNoneSelector = &metav1.LabelSelector{
		MatchExpressions: []metav1.LabelSelectorRequirement{{Key: PDBV1beta1Label, Operator: metav1.LabelSelectorOpExists}},
	}

	V1beta1MatchNoneSelector = &metav1.LabelSelector{}
	V1beta1MatchAllSelector  = &metav1.LabelSelector{
		MatchExpressions: []metav1.LabelSelectorRequirement{{Key: PDBV1beta1Label, Operator: metav1.LabelSelectorOpDoesNotExist}},
	}
)

var (
	// SchemeBuilder is the scheme builder with scheme init functions to run for this API package
	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
	// AddToScheme is a global function that registers this API group & version to a scheme
	AddToScheme = SchemeBuilder.AddToScheme
)

var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: runtime.APIVersionInternal}

type Eviction struct {
	metav1.TypeMeta

	// ObjectMeta describes the pod that is being evicted.
	// +optional
	metav1.ObjectMeta

	// DeleteOptions may be provided
	// +optional
	DeleteOptions *metav1.DeleteOptions
}

type PodDisruptionBudget struct {
	metav1.TypeMeta
	// +optional
	metav1.ObjectMeta

	// Specification of the desired behavior of the PodDisruptionBudget.
	// +optional
	Spec PodDisruptionBudgetSpec
	// Most recently observed status of the PodDisruptionBudget.
	// +optional
	Status PodDisruptionBudgetStatus
}

type PodDisruptionBudgetList struct {
	metav1.TypeMeta
	// +optional
	metav1.ListMeta
	Items []PodDisruptionBudget
}

type PodDisruptionBudgetSpec struct {
	// An eviction is allowed if at least "minAvailable" pods selected by
	// "selector" will still be available after the eviction, i.e. even in the
	// absence of the evicted pod.  So for example you can prevent all voluntary
	// evictions by specifying "100%".
	// +optional
	MinAvailable *intstr.IntOrString

	// Label query over pods whose evictions are managed by the disruption
	// budget.
	// +optional
	Selector *metav1.LabelSelector

	// An eviction is allowed if at most "maxUnavailable" pods selected by
	// "selector" are unavailable after the eviction, i.e. even in absence of
	// the evicted pod. For example, one can prevent all voluntary evictions
	// by specifying 0. This is a mutually exclusive setting with "minAvailable".
	// +optional
	MaxUnavailable *intstr.IntOrString

	// UnhealthyPodEvictionPolicy defines the criteria for when unhealthy pods
	// should be considered for eviction. Current implementation considers healthy pods,
	// as pods that have status.conditions item with type="Ready",status="True".
	//
	// Valid policies are IfHealthyBudget and AlwaysAllow.
	// If no policy is specified, the default behavior will be used,
	// which corresponds to the IfHealthyBudget policy.
	//
	// IfHealthyBudget policy means that running pods (status.phase="Running"),
	// but not yet healthy can be evicted only if the guarded application is not
	// disrupted (status.currentHealthy is at least equal to status.desiredHealthy).
	// Healthy pods will be subject to the PDB for eviction.
	//
	// AlwaysAllow policy means that all running pods (status.phase="Running"),
	// but not yet healthy are considered disrupted and can be evicted regardless
	// of whether the criteria in a PDB is met. This means perspective running
	// pods of a disrupted application might not get a chance to become healthy.
	// Healthy pods will be subject to the PDB for eviction.
	//
	// Additional policies may be added in the future.
	// Clients making eviction decisions should disallow eviction of unhealthy pods
	// if they encounter an unrecognized policy in this field.
	// +optional
	UnhealthyPodEvictionPolicy *UnhealthyPodEvictionPolicyType
}

type PodDisruptionBudgetStatus struct {
	// Most recent generation observed when updating this PDB status. DisruptionsAllowed and other
	// status information is valid only if observedGeneration equals to PDB's object generation.
	// +optional
	ObservedGeneration int64

	// DisruptedPods contains information about pods whose eviction was
	// processed by the API server eviction subresource handler but has not
	// yet been observed by the PodDisruptionBudget controller.
	// A pod will be in this map from the time when the API server processed the
	// eviction request to the time when the pod is seen by PDB controller
	// as having been marked for deletion (or after a timeout). The key in the map is the name of the pod
	// and the value is the time when the API server processed the eviction request. If
	// the deletion didn't occur and a pod is still there it will be removed from
	// the list automatically by PodDisruptionBudget controller after some time.
	// If everything goes smooth this map should be empty for the most of the time.
	// Large number of entries in the map may indicate problems with pod deletions.
	// +optional
	DisruptedPods map[string]metav1.Time

	// Number of pod disruptions that are currently allowed.
	DisruptionsAllowed int32

	// current number of healthy pods
	CurrentHealthy int32

	// minimum desired number of healthy pods
	DesiredHealthy int32

	// total number of pods counted by this disruption budget
	ExpectedPods int32

	// Conditions contain conditions for PDB
	// +optional
	Conditions []metav1.Condition
}

type UnhealthyPodEvictionPolicyType string

const (
	// IfHealthyBudget policy means that running pods (status.phase="Running"),
	// but not yet healthy can be evicted only if the guarded application is not
	// disrupted (status.currentHealthy is at least equal to status.desiredHealthy).
	// Healthy pods will be subject to the PDB for eviction.
	IfHealthyBudget UnhealthyPodEvictionPolicyType = "IfHealthyBudget"

	// AlwaysAllow policy means that all running pods (status.phase="Running"),
	// but not yet healthy are considered disrupted and can be evicted regardless
	// of whether the criteria in a PDB is met. This means perspective running
	// pods of a disrupted application might not get a chance to become healthy.
	// Healthy pods will be subject to the PDB for eviction.
	AlwaysAllow UnhealthyPodEvictionPolicyType = "AlwaysAllow"
)