/*
Copyright 2017 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 api

import (
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

type DeschedulerPolicy struct {
	metav1.TypeMeta

	// Strategies
	Strategies StrategyList

	// NodeSelector for a set of nodes to operate over
	NodeSelector *string

	// EvictFailedBarePods allows pods without ownerReferences and in failed phase to be evicted.
	EvictFailedBarePods *bool

	// EvictLocalStoragePods allows pods using local storage to be evicted.
	EvictLocalStoragePods *bool

	// EvictSystemCriticalPods allows eviction of pods of any priority (including Kubernetes system pods)
	EvictSystemCriticalPods *bool

	// IgnorePVCPods prevents pods with PVCs from being evicted.
	IgnorePVCPods *bool

	// MaxNoOfPodsToEvictPerNode restricts maximum of pods to be evicted per node.
	MaxNoOfPodsToEvictPerNode *uint

	// MaxNoOfPodsToEvictPerNamespace restricts maximum of pods to be evicted per namespace.
	MaxNoOfPodsToEvictPerNamespace *uint
}

type (
	StrategyName string
	StrategyList map[StrategyName]DeschedulerStrategy
)

type DeschedulerStrategy struct {
	// Enabled or disabled
	Enabled bool

	// Weight
	Weight int

	// Strategy parameters
	Params *StrategyParameters
}

// Namespaces carries a list of included/excluded namespaces
// for which a given strategy is applicable
type Namespaces struct {
	Include []string
	Exclude []string
}

// Besides Namespaces only one of its members may be specified
// TODO(jchaloup): move Namespaces ThresholdPriority and ThresholdPriorityClassName to individual strategies
//
//	once the policy version is bumped to v1alpha2
type StrategyParameters struct {
	NodeResourceUtilizationThresholds *NodeResourceUtilizationThresholds
	NodeAffinityType                  []string
	PodsHavingTooManyRestarts         *PodsHavingTooManyRestarts
	PodLifeTime                       *PodLifeTime
	RemoveDuplicates                  *RemoveDuplicates
	FailedPods                        *FailedPods
	IncludeSoftConstraints            bool
	Namespaces                        *Namespaces
	ThresholdPriority                 *int32
	ThresholdPriorityClassName        string
	LabelSelector                     *metav1.LabelSelector
	NodeFit                           bool
	IncludePreferNoSchedule           bool
	ExcludedTaints                    []string
}

type (
	Percentage         float64
	ResourceThresholds map[v1.ResourceName]Percentage
)

type NodeResourceUtilizationThresholds struct {
	UseDeviationThresholds bool
	Thresholds             ResourceThresholds
	TargetThresholds       ResourceThresholds
	NumberOfNodes          int
}

type PodsHavingTooManyRestarts struct {
	PodRestartThreshold     int32
	IncludingInitContainers bool
}

type RemoveDuplicates struct {
	ExcludeOwnerKinds []string
}

type PodLifeTime struct {
	MaxPodLifeTimeSeconds *uint
	States                []string

	// Deprecated: Use States instead.
	PodStatusPhases []string
}

type FailedPods struct {
	ExcludeOwnerKinds       []string
	MinPodLifetimeSeconds   *uint
	Reasons                 []string
	IncludingInitContainers bool
}

type PriorityThreshold struct {
	Value *int32
	Name  string
}