/*
Copyright 2016 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package v1beta1

import (
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/client-go/pkg/api/v1"
)

const (
	// StatefulSetInitAnnotation if present, and set to false, indicates that a Pod's readiness should be ignored.
	StatefulSetInitAnnotation = "pod.alpha.kubernetes.io/initialized"
)

// ScaleSpec describes the attributes of a scale subresource
type ScaleSpec struct {
	// desired number of instances for the scaled object.
	// +optional
	Replicas int32 `json:"replicas,omitempty" protobuf:"varint,1,opt,name=replicas"`
}

// ScaleStatus represents the current status of a scale subresource.
type ScaleStatus struct {
	// actual number of observed instances of the scaled object.
	Replicas int32 `json:"replicas" protobuf:"varint,1,opt,name=replicas"`

	// label query over pods that should match the replicas count. More info: http://kubernetes.io/docs/user-guide/labels#label-selectors
	// +optional
	Selector map[string]string `json:"selector,omitempty" protobuf:"bytes,2,rep,name=selector"`

	// label selector for pods that should match the replicas count. This is a serializated
	// version of both map-based and more expressive set-based selectors. This is done to
	// avoid introspection in the clients. The string will be in the same format as the
	// query-param syntax. If the target type only supports map-based selectors, both this
	// field and map-based selector field are populated.
	// More info: http://kubernetes.io/docs/user-guide/labels#label-selectors
	// +optional
	TargetSelector string `json:"targetSelector,omitempty" protobuf:"bytes,3,opt,name=targetSelector"`
}

// +genclient=true
// +noMethods=true

// Scale represents a scaling request for a resource.
type Scale struct {
	metav1.TypeMeta `json:",inline"`
	// Standard object metadata; More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#metadata.
	// +optional
	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// defines the behavior of the scale. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#spec-and-status.
	// +optional
	Spec ScaleSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`

	// current status of the scale. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#spec-and-status. Read-only.
	// +optional
	Status ScaleStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}

// +genclient=true

// StatefulSet represents a set of pods with consistent identities.
// Identities are defined as:
//  - Network: A single stable DNS and hostname.
//  - Storage: As many VolumeClaims as requested.
// The StatefulSet guarantees that a given network identity will always
// map to the same storage identity.
type StatefulSet struct {
	metav1.TypeMeta `json:",inline"`
	// +optional
	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Spec defines the desired identities of pods in this set.
	// +optional
	Spec StatefulSetSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`

	// Status is the current status of Pods in this StatefulSet. This data
	// may be out of date by some window of time.
	// +optional
	Status StatefulSetStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}

// A StatefulSetSpec is the specification of a StatefulSet.
type StatefulSetSpec struct {
	// Replicas is the desired number of replicas of the given Template.
	// These are replicas in the sense that they are instantiations of the
	// same Template, but individual replicas also have a consistent identity.
	// If unspecified, defaults to 1.
	// TODO: Consider a rename of this field.
	// +optional
	Replicas *int32 `json:"replicas,omitempty" protobuf:"varint,1,opt,name=replicas"`

	// Selector is a label query over pods that should match the replica count.
	// If empty, defaulted to labels on the pod template.
	// More info: http://kubernetes.io/docs/user-guide/labels#label-selectors
	// +optional
	Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,2,opt,name=selector"`

	// Template is the object that describes the pod that will be created if
	// insufficient replicas are detected. Each pod stamped out by the StatefulSet
	// will fulfill this Template, but have a unique identity from the rest
	// of the StatefulSet.
	Template v1.PodTemplateSpec `json:"template" protobuf:"bytes,3,opt,name=template"`

	// VolumeClaimTemplates is a list of claims that pods are allowed to reference.
	// The StatefulSet controller is responsible for mapping network identities to
	// claims in a way that maintains the identity of a pod. Every claim in
	// this list must have at least one matching (by name) volumeMount in one
	// container in the template. A claim in this list takes precedence over
	// any volumes in the template, with the same name.
	// TODO: Define the behavior if a claim already exists with the same name.
	// +optional
	VolumeClaimTemplates []v1.PersistentVolumeClaim `json:"volumeClaimTemplates,omitempty" protobuf:"bytes,4,rep,name=volumeClaimTemplates"`

	// ServiceName is the name of the service that governs this StatefulSet.
	// This service must exist before the StatefulSet, and is responsible for
	// the network identity of the set. Pods get DNS/hostnames that follow the
	// pattern: pod-specific-string.serviceName.default.svc.cluster.local
	// where "pod-specific-string" is managed by the StatefulSet controller.
	ServiceName string `json:"serviceName" protobuf:"bytes,5,opt,name=serviceName"`
}

// StatefulSetStatus represents the current state of a StatefulSet.
type StatefulSetStatus struct {
	// most recent generation observed by this StatefulSet.
	// +optional
	ObservedGeneration *int64 `json:"observedGeneration,omitempty" protobuf:"varint,1,opt,name=observedGeneration"`

	// Replicas is the number of actual replicas.
	Replicas int32 `json:"replicas" protobuf:"varint,2,opt,name=replicas"`
}

// StatefulSetList is a collection of StatefulSets.
type StatefulSetList struct {
	metav1.TypeMeta `json:",inline"`
	// +optional
	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
	Items           []StatefulSet `json:"items" protobuf:"bytes,2,rep,name=items"`
}

// +genclient=true

// Deployment enables declarative updates for Pods and ReplicaSets.
type Deployment struct {
	metav1.TypeMeta `json:",inline"`
	// Standard object metadata.
	// +optional
	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Specification of the desired behavior of the Deployment.
	// +optional
	Spec DeploymentSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`

	// Most recently observed status of the Deployment.
	// +optional
	Status DeploymentStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}

// DeploymentSpec is the specification of the desired behavior of the Deployment.
type DeploymentSpec struct {
	// Number of desired pods. This is a pointer to distinguish between explicit
	// zero and not specified. Defaults to 1.
	// +optional
	Replicas *int32 `json:"replicas,omitempty" protobuf:"varint,1,opt,name=replicas"`

	// Label selector for pods. Existing ReplicaSets whose pods are
	// selected by this will be the ones affected by this deployment.
	// +optional
	Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,2,opt,name=selector"`

	// Template describes the pods that will be created.
	Template v1.PodTemplateSpec `json:"template" protobuf:"bytes,3,opt,name=template"`

	// The deployment strategy to use to replace existing pods with new ones.
	// +optional
	Strategy DeploymentStrategy `json:"strategy,omitempty" protobuf:"bytes,4,opt,name=strategy"`

	// Minimum number of seconds for which a newly created pod should be ready
	// without any of its container crashing, for it to be considered available.
	// Defaults to 0 (pod will be considered available as soon as it is ready)
	// +optional
	MinReadySeconds int32 `json:"minReadySeconds,omitempty" protobuf:"varint,5,opt,name=minReadySeconds"`

	// The number of old ReplicaSets to retain to allow rollback.
	// This is a pointer to distinguish between explicit zero and not specified.
	// Defaults to 2.
	// +optional
	RevisionHistoryLimit *int32 `json:"revisionHistoryLimit,omitempty" protobuf:"varint,6,opt,name=revisionHistoryLimit"`

	// Indicates that the deployment is paused.
	// +optional
	Paused bool `json:"paused,omitempty" protobuf:"varint,7,opt,name=paused"`

	// The config this deployment is rolling back to. Will be cleared after rollback is done.
	// +optional
	RollbackTo *RollbackConfig `json:"rollbackTo,omitempty" protobuf:"bytes,8,opt,name=rollbackTo"`

	// The maximum time in seconds for a deployment to make progress before it
	// is considered to be failed. The deployment controller will continue to
	// process failed deployments and a condition with a ProgressDeadlineExceeded
	// reason will be surfaced in the deployment status. Once autoRollback is
	// implemented, the deployment controller will automatically rollback failed
	// deployments. Note that progress will not be estimated during the time a
	// deployment is paused. Defaults to 600s.
	ProgressDeadlineSeconds *int32 `json:"progressDeadlineSeconds,omitempty" protobuf:"varint,9,opt,name=progressDeadlineSeconds"`
}

// DeploymentRollback stores the information required to rollback a deployment.
type DeploymentRollback struct {
	metav1.TypeMeta `json:",inline"`
	// Required: This must match the Name of a deployment.
	Name string `json:"name" protobuf:"bytes,1,opt,name=name"`
	// The annotations to be updated to a deployment
	// +optional
	UpdatedAnnotations map[string]string `json:"updatedAnnotations,omitempty" protobuf:"bytes,2,rep,name=updatedAnnotations"`
	// The config of this deployment rollback.
	RollbackTo RollbackConfig `json:"rollbackTo" protobuf:"bytes,3,opt,name=rollbackTo"`
}

type RollbackConfig struct {
	// The revision to rollback to. If set to 0, rollbck to the last revision.
	// +optional
	Revision int64 `json:"revision,omitempty" protobuf:"varint,1,opt,name=revision"`
}

const (
	// DefaultDeploymentUniqueLabelKey is the default key of the selector that is added
	// to existing RCs (and label key that is added to its pods) to prevent the existing RCs
	// to select new pods (and old pods being select by new RC).
	DefaultDeploymentUniqueLabelKey string = "pod-template-hash"
)

// DeploymentStrategy describes how to replace existing pods with new ones.
type DeploymentStrategy struct {
	// Type of deployment. Can be "Recreate" or "RollingUpdate". Default is RollingUpdate.
	// +optional
	Type DeploymentStrategyType `json:"type,omitempty" protobuf:"bytes,1,opt,name=type,casttype=DeploymentStrategyType"`

	// Rolling update config params. Present only if DeploymentStrategyType =
	// RollingUpdate.
	//---
	// TODO: Update this to follow our convention for oneOf, whatever we decide it
	// to be.
	// +optional
	RollingUpdate *RollingUpdateDeployment `json:"rollingUpdate,omitempty" protobuf:"bytes,2,opt,name=rollingUpdate"`
}

type DeploymentStrategyType string

const (
	// Kill all existing pods before creating new ones.
	RecreateDeploymentStrategyType DeploymentStrategyType = "Recreate"

	// Replace the old RCs by new one using rolling update i.e gradually scale down the old RCs and scale up the new one.
	RollingUpdateDeploymentStrategyType DeploymentStrategyType = "RollingUpdate"
)

// Spec to control the desired behavior of rolling update.
type RollingUpdateDeployment struct {
	// The maximum number of pods that can be unavailable during the update.
	// Value can be an absolute number (ex: 5) or a percentage of desired pods (ex: 10%).
	// Absolute number is calculated from percentage by rounding down.
	// This can not be 0 if MaxSurge is 0.
	// Defaults to 25%.
	// Example: when this is set to 30%, the old RC can be scaled down to 70% of desired pods
	// immediately when the rolling update starts. Once new pods are ready, old RC
	// can be scaled down further, followed by scaling up the new RC, ensuring
	// that the total number of pods available at all times during the update is at
	// least 70% of desired pods.
	// +optional
	MaxUnavailable *intstr.IntOrString `json:"maxUnavailable,omitempty" protobuf:"bytes,1,opt,name=maxUnavailable"`

	// The maximum number of pods that can be scheduled above the desired number of
	// pods.
	// Value can be an absolute number (ex: 5) or a percentage of desired pods (ex: 10%).
	// This can not be 0 if MaxUnavailable is 0.
	// Absolute number is calculated from percentage by rounding up.
	// Defaults to 25%.
	// Example: when this is set to 30%, the new RC can be scaled up immediately when
	// the rolling update starts, such that the total number of old and new pods do not exceed
	// 130% of desired pods. Once old pods have been killed,
	// new RC can be scaled up further, ensuring that total number of pods running
	// at any time during the update is atmost 130% of desired pods.
	// +optional
	MaxSurge *intstr.IntOrString `json:"maxSurge,omitempty" protobuf:"bytes,2,opt,name=maxSurge"`
}

// DeploymentStatus is the most recently observed status of the Deployment.
type DeploymentStatus struct {
	// The generation observed by the deployment controller.
	// +optional
	ObservedGeneration int64 `json:"observedGeneration,omitempty" protobuf:"varint,1,opt,name=observedGeneration"`

	// Total number of non-terminated pods targeted by this deployment (their labels match the selector).
	// +optional
	Replicas int32 `json:"replicas,omitempty" protobuf:"varint,2,opt,name=replicas"`

	// Total number of non-terminated pods targeted by this deployment that have the desired template spec.
	// +optional
	UpdatedReplicas int32 `json:"updatedReplicas,omitempty" protobuf:"varint,3,opt,name=updatedReplicas"`

	// Total number of ready pods targeted by this deployment.
	// +optional
	ReadyReplicas int32 `json:"readyReplicas,omitempty" protobuf:"varint,7,opt,name=readyReplicas"`

	// Total number of available pods (ready for at least minReadySeconds) targeted by this deployment.
	// +optional
	AvailableReplicas int32 `json:"availableReplicas,omitempty" protobuf:"varint,4,opt,name=availableReplicas"`

	// Total number of unavailable pods targeted by this deployment.
	// +optional
	UnavailableReplicas int32 `json:"unavailableReplicas,omitempty" protobuf:"varint,5,opt,name=unavailableReplicas"`

	// Represents the latest available observations of a deployment's current state.
	Conditions []DeploymentCondition `json:"conditions,omitempty" patchStrategy:"merge" patchMergeKey:"type" protobuf:"bytes,6,rep,name=conditions"`
}

type DeploymentConditionType string

// These are valid conditions of a deployment.
const (
	// Available means the deployment is available, ie. at least the minimum available
	// replicas required are up and running for at least minReadySeconds.
	DeploymentAvailable DeploymentConditionType = "Available"
	// Progressing means the deployment is progressing. Progress for a deployment is
	// considered when a new replica set is created or adopted, and when new pods scale
	// up or old pods scale down. Progress is not estimated for paused deployments or
	// when progressDeadlineSeconds is not specified.
	DeploymentProgressing DeploymentConditionType = "Progressing"
	// ReplicaFailure is added in a deployment when one of its pods fails to be created
	// or deleted.
	DeploymentReplicaFailure DeploymentConditionType = "ReplicaFailure"
)

// DeploymentCondition describes the state of a deployment at a certain point.
type DeploymentCondition struct {
	// Type of deployment condition.
	Type DeploymentConditionType `json:"type" protobuf:"bytes,1,opt,name=type,casttype=DeploymentConditionType"`
	// Status of the condition, one of True, False, Unknown.
	Status v1.ConditionStatus `json:"status" protobuf:"bytes,2,opt,name=status,casttype=k8s.io/kubernetes/pkg/api/v1.ConditionStatus"`
	// The last time this condition was updated.
	LastUpdateTime metav1.Time `json:"lastUpdateTime,omitempty" protobuf:"bytes,6,opt,name=lastUpdateTime"`
	// Last time the condition transitioned from one status to another.
	LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" protobuf:"bytes,7,opt,name=lastTransitionTime"`
	// The reason for the condition's last transition.
	Reason string `json:"reason,omitempty" protobuf:"bytes,4,opt,name=reason"`
	// A human readable message indicating details about the transition.
	Message string `json:"message,omitempty" protobuf:"bytes,5,opt,name=message"`
}

// DeploymentList is a list of Deployments.
type DeploymentList struct {
	metav1.TypeMeta `json:",inline"`
	// Standard list metadata.
	// +optional
	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Items is the list of Deployments.
	Items []Deployment `json:"items" protobuf:"bytes,2,rep,name=items"`
}