/*
Copyright 2015 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 v1

import (
	"time"

	"k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/kubernetes/pkg/util/parsers"
	utilpointer "k8s.io/utils/pointer"

	utilfeature "k8s.io/apiserver/pkg/util/feature"
	"k8s.io/kubernetes/pkg/features"
	utilnet "k8s.io/utils/net"
)

func addDefaultingFuncs(scheme *runtime.Scheme) error {
	return RegisterDefaults(scheme)
}

func SetDefaults_ResourceList(obj *v1.ResourceList) {
	for key, val := range *obj {
		// TODO(#18538): We round up resource values to milli scale to maintain API compatibility.
		// In the future, we should instead reject values that need rounding.
		const milliScale = -3
		val.RoundUp(milliScale)

		(*obj)[v1.ResourceName(key)] = val
	}
}

func SetDefaults_ReplicationController(obj *v1.ReplicationController) {
	var labels map[string]string
	if obj.Spec.Template != nil {
		labels = obj.Spec.Template.Labels
	}
	// TODO: support templates defined elsewhere when we support them in the API
	if labels != nil {
		if len(obj.Spec.Selector) == 0 {
			obj.Spec.Selector = labels
		}
		if len(obj.Labels) == 0 {
			obj.Labels = labels
		}
	}
	if obj.Spec.Replicas == nil {
		obj.Spec.Replicas = new(int32)
		*obj.Spec.Replicas = 1
	}
}
func SetDefaults_Volume(obj *v1.Volume) {
	if utilpointer.AllPtrFieldsNil(&obj.VolumeSource) {
		obj.VolumeSource = v1.VolumeSource{
			EmptyDir: &v1.EmptyDirVolumeSource{},
		}
	}
}
func SetDefaults_ContainerPort(obj *v1.ContainerPort) {
	if obj.Protocol == "" {
		obj.Protocol = v1.ProtocolTCP
	}
}
func SetDefaults_Container(obj *v1.Container) {
	if obj.ImagePullPolicy == "" {
		// Ignore error and assume it has been validated elsewhere
		_, tag, _, _ := parsers.ParseImageName(obj.Image)

		// Check image tag
		if tag == "latest" {
			obj.ImagePullPolicy = v1.PullAlways
		} else {
			obj.ImagePullPolicy = v1.PullIfNotPresent
		}
	}
	if obj.TerminationMessagePath == "" {
		obj.TerminationMessagePath = v1.TerminationMessagePathDefault
	}
	if obj.TerminationMessagePolicy == "" {
		obj.TerminationMessagePolicy = v1.TerminationMessageReadFile
	}
}

func SetDefaults_Service(obj *v1.Service) {
	if obj.Spec.SessionAffinity == "" {
		obj.Spec.SessionAffinity = v1.ServiceAffinityNone
	}
	if obj.Spec.SessionAffinity == v1.ServiceAffinityNone {
		obj.Spec.SessionAffinityConfig = nil
	}
	if obj.Spec.SessionAffinity == v1.ServiceAffinityClientIP {
		if obj.Spec.SessionAffinityConfig == nil || obj.Spec.SessionAffinityConfig.ClientIP == nil || obj.Spec.SessionAffinityConfig.ClientIP.TimeoutSeconds == nil {
			timeoutSeconds := v1.DefaultClientIPServiceAffinitySeconds
			obj.Spec.SessionAffinityConfig = &v1.SessionAffinityConfig{
				ClientIP: &v1.ClientIPConfig{
					TimeoutSeconds: &timeoutSeconds,
				},
			}
		}
	}
	if obj.Spec.Type == "" {
		obj.Spec.Type = v1.ServiceTypeClusterIP
	}
	for i := range obj.Spec.Ports {
		sp := &obj.Spec.Ports[i]
		if sp.Protocol == "" {
			sp.Protocol = v1.ProtocolTCP
		}
		if sp.TargetPort == intstr.FromInt(0) || sp.TargetPort == intstr.FromString("") {
			sp.TargetPort = intstr.FromInt(int(sp.Port))
		}
	}
	// Defaults ExternalTrafficPolicy field for NodePort / LoadBalancer service
	// to Global for consistency.
	if (obj.Spec.Type == v1.ServiceTypeNodePort ||
		obj.Spec.Type == v1.ServiceTypeLoadBalancer) &&
		obj.Spec.ExternalTrafficPolicy == "" {
		obj.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeCluster
	}

	// if dualstack feature gate is on then we need to default
	// Spec.IPFamily correctly. This is to cover the case
	// when an existing cluster have been converted to dualstack
	// i.e. it already contain services with Spec.IPFamily==nil
	if utilfeature.DefaultFeatureGate.Enabled(features.IPv6DualStack) &&
		obj.Spec.Type != v1.ServiceTypeExternalName &&
		obj.Spec.ClusterIP != "" && /*has an ip already set*/
		obj.Spec.ClusterIP != "None" && /* not converting from ExternalName to other */
		obj.Spec.IPFamily == nil /* family was not previously set */ {

		// there is a change that the ClusterIP (set by user) is unparsable.
		// in this case, the family will be set mistakenly to ipv4 (because
		// the util function does not parse errors *sigh*). The error
		// will be caught in validation which asserts the validity of the
		// IP and the service object will not be persisted with the wrong IP
		// family

		ipv6 := v1.IPv6Protocol
		ipv4 := v1.IPv4Protocol
		if utilnet.IsIPv6String(obj.Spec.ClusterIP) {
			obj.Spec.IPFamily = &ipv6
		} else {
			obj.Spec.IPFamily = &ipv4
		}
	}

}
func SetDefaults_Pod(obj *v1.Pod) {
	// If limits are specified, but requests are not, default requests to limits
	// This is done here rather than a more specific defaulting pass on v1.ResourceRequirements
	// because we only want this defaulting semantic to take place on a v1.Pod and not a v1.PodTemplate
	for i := range obj.Spec.Containers {
		// set requests to limits if requests are not specified, but limits are
		if obj.Spec.Containers[i].Resources.Limits != nil {
			if obj.Spec.Containers[i].Resources.Requests == nil {
				obj.Spec.Containers[i].Resources.Requests = make(v1.ResourceList)
			}
			for key, value := range obj.Spec.Containers[i].Resources.Limits {
				if _, exists := obj.Spec.Containers[i].Resources.Requests[key]; !exists {
					obj.Spec.Containers[i].Resources.Requests[key] = value.DeepCopy()
				}
			}
		}
	}
	for i := range obj.Spec.InitContainers {
		if obj.Spec.InitContainers[i].Resources.Limits != nil {
			if obj.Spec.InitContainers[i].Resources.Requests == nil {
				obj.Spec.InitContainers[i].Resources.Requests = make(v1.ResourceList)
			}
			for key, value := range obj.Spec.InitContainers[i].Resources.Limits {
				if _, exists := obj.Spec.InitContainers[i].Resources.Requests[key]; !exists {
					obj.Spec.InitContainers[i].Resources.Requests[key] = value.DeepCopy()
				}
			}
		}
	}
	if obj.Spec.EnableServiceLinks == nil {
		enableServiceLinks := v1.DefaultEnableServiceLinks
		obj.Spec.EnableServiceLinks = &enableServiceLinks
	}
}
func SetDefaults_PodSpec(obj *v1.PodSpec) {
	// New fields added here will break upgrade tests:
	// https://github.com/kubernetes/kubernetes/issues/69445
	// In most cases the new defaulted field can added to SetDefaults_Pod instead of here, so
	// that it only materializes in the Pod object and not all objects with a PodSpec field.
	if obj.DNSPolicy == "" {
		obj.DNSPolicy = v1.DNSClusterFirst
	}
	if obj.RestartPolicy == "" {
		obj.RestartPolicy = v1.RestartPolicyAlways
	}
	if obj.HostNetwork {
		defaultHostNetworkPorts(&obj.Containers)
		defaultHostNetworkPorts(&obj.InitContainers)
	}
	if obj.SecurityContext == nil {
		obj.SecurityContext = &v1.PodSecurityContext{}
	}
	if obj.TerminationGracePeriodSeconds == nil {
		period := int64(v1.DefaultTerminationGracePeriodSeconds)
		obj.TerminationGracePeriodSeconds = &period
	}
	if obj.SchedulerName == "" {
		obj.SchedulerName = v1.DefaultSchedulerName
	}
}
func SetDefaults_Probe(obj *v1.Probe) {
	if obj.TimeoutSeconds == 0 {
		obj.TimeoutSeconds = 1
	}
	if obj.PeriodSeconds == 0 {
		obj.PeriodSeconds = 10
	}
	if obj.SuccessThreshold == 0 {
		obj.SuccessThreshold = 1
	}
	if obj.FailureThreshold == 0 {
		obj.FailureThreshold = 3
	}
}
func SetDefaults_SecretVolumeSource(obj *v1.SecretVolumeSource) {
	if obj.DefaultMode == nil {
		perm := int32(v1.SecretVolumeSourceDefaultMode)
		obj.DefaultMode = &perm
	}
}
func SetDefaults_ConfigMapVolumeSource(obj *v1.ConfigMapVolumeSource) {
	if obj.DefaultMode == nil {
		perm := int32(v1.ConfigMapVolumeSourceDefaultMode)
		obj.DefaultMode = &perm
	}
}
func SetDefaults_DownwardAPIVolumeSource(obj *v1.DownwardAPIVolumeSource) {
	if obj.DefaultMode == nil {
		perm := int32(v1.DownwardAPIVolumeSourceDefaultMode)
		obj.DefaultMode = &perm
	}
}
func SetDefaults_Secret(obj *v1.Secret) {
	if obj.Type == "" {
		obj.Type = v1.SecretTypeOpaque
	}
}
func SetDefaults_ProjectedVolumeSource(obj *v1.ProjectedVolumeSource) {
	if obj.DefaultMode == nil {
		perm := int32(v1.ProjectedVolumeSourceDefaultMode)
		obj.DefaultMode = &perm
	}
}
func SetDefaults_ServiceAccountTokenProjection(obj *v1.ServiceAccountTokenProjection) {
	hour := int64(time.Hour.Seconds())
	if obj.ExpirationSeconds == nil {
		obj.ExpirationSeconds = &hour
	}
}
func SetDefaults_PersistentVolume(obj *v1.PersistentVolume) {
	if obj.Status.Phase == "" {
		obj.Status.Phase = v1.VolumePending
	}
	if obj.Spec.PersistentVolumeReclaimPolicy == "" {
		obj.Spec.PersistentVolumeReclaimPolicy = v1.PersistentVolumeReclaimRetain
	}
	if obj.Spec.VolumeMode == nil {
		obj.Spec.VolumeMode = new(v1.PersistentVolumeMode)
		*obj.Spec.VolumeMode = v1.PersistentVolumeFilesystem
	}
}
func SetDefaults_PersistentVolumeClaim(obj *v1.PersistentVolumeClaim) {
	if obj.Status.Phase == "" {
		obj.Status.Phase = v1.ClaimPending
	}
	if obj.Spec.VolumeMode == nil {
		obj.Spec.VolumeMode = new(v1.PersistentVolumeMode)
		*obj.Spec.VolumeMode = v1.PersistentVolumeFilesystem
	}
}
func SetDefaults_ISCSIVolumeSource(obj *v1.ISCSIVolumeSource) {
	if obj.ISCSIInterface == "" {
		obj.ISCSIInterface = "default"
	}
}
func SetDefaults_ISCSIPersistentVolumeSource(obj *v1.ISCSIPersistentVolumeSource) {
	if obj.ISCSIInterface == "" {
		obj.ISCSIInterface = "default"
	}
}
func SetDefaults_AzureDiskVolumeSource(obj *v1.AzureDiskVolumeSource) {
	if obj.CachingMode == nil {
		obj.CachingMode = new(v1.AzureDataDiskCachingMode)
		*obj.CachingMode = v1.AzureDataDiskCachingReadWrite
	}
	if obj.Kind == nil {
		obj.Kind = new(v1.AzureDataDiskKind)
		*obj.Kind = v1.AzureSharedBlobDisk
	}
	if obj.FSType == nil {
		obj.FSType = new(string)
		*obj.FSType = "ext4"
	}
	if obj.ReadOnly == nil {
		obj.ReadOnly = new(bool)
		*obj.ReadOnly = false
	}
}
func SetDefaults_Endpoints(obj *v1.Endpoints) {
	for i := range obj.Subsets {
		ss := &obj.Subsets[i]
		for i := range ss.Ports {
			ep := &ss.Ports[i]
			if ep.Protocol == "" {
				ep.Protocol = v1.ProtocolTCP
			}
		}
	}
}
func SetDefaults_HTTPGetAction(obj *v1.HTTPGetAction) {
	if obj.Path == "" {
		obj.Path = "/"
	}
	if obj.Scheme == "" {
		obj.Scheme = v1.URISchemeHTTP
	}
}
func SetDefaults_NamespaceStatus(obj *v1.NamespaceStatus) {
	if obj.Phase == "" {
		obj.Phase = v1.NamespaceActive
	}
}
func SetDefaults_NodeStatus(obj *v1.NodeStatus) {
	if obj.Allocatable == nil && obj.Capacity != nil {
		obj.Allocatable = make(v1.ResourceList, len(obj.Capacity))
		for key, value := range obj.Capacity {
			obj.Allocatable[key] = value.DeepCopy()
		}
		obj.Allocatable = obj.Capacity
	}
}
func SetDefaults_ObjectFieldSelector(obj *v1.ObjectFieldSelector) {
	if obj.APIVersion == "" {
		obj.APIVersion = "v1"
	}
}
func SetDefaults_LimitRangeItem(obj *v1.LimitRangeItem) {
	// for container limits, we apply default values
	if obj.Type == v1.LimitTypeContainer {

		if obj.Default == nil {
			obj.Default = make(v1.ResourceList)
		}
		if obj.DefaultRequest == nil {
			obj.DefaultRequest = make(v1.ResourceList)
		}

		// If a default limit is unspecified, but the max is specified, default the limit to the max
		for key, value := range obj.Max {
			if _, exists := obj.Default[key]; !exists {
				obj.Default[key] = value.DeepCopy()
			}
		}
		// If a default limit is specified, but the default request is not, default request to limit
		for key, value := range obj.Default {
			if _, exists := obj.DefaultRequest[key]; !exists {
				obj.DefaultRequest[key] = value.DeepCopy()
			}
		}
		// If a default request is not specified, but the min is provided, default request to the min
		for key, value := range obj.Min {
			if _, exists := obj.DefaultRequest[key]; !exists {
				obj.DefaultRequest[key] = value.DeepCopy()
			}
		}
	}
}
func SetDefaults_ConfigMap(obj *v1.ConfigMap) {
	if obj.Data == nil {
		obj.Data = make(map[string]string)
	}
}

// With host networking default all container ports to host ports.
func defaultHostNetworkPorts(containers *[]v1.Container) {
	for i := range *containers {
		for j := range (*containers)[i].Ports {
			if (*containers)[i].Ports[j].HostPort == 0 {
				(*containers)[i].Ports[j].HostPort = (*containers)[i].Ports[j].ContainerPort
			}
		}
	}
}

func SetDefaults_RBDVolumeSource(obj *v1.RBDVolumeSource) {
	if obj.RBDPool == "" {
		obj.RBDPool = "rbd"
	}
	if obj.RadosUser == "" {
		obj.RadosUser = "admin"
	}
	if obj.Keyring == "" {
		obj.Keyring = "/etc/ceph/keyring"
	}
}

func SetDefaults_RBDPersistentVolumeSource(obj *v1.RBDPersistentVolumeSource) {
	if obj.RBDPool == "" {
		obj.RBDPool = "rbd"
	}
	if obj.RadosUser == "" {
		obj.RadosUser = "admin"
	}
	if obj.Keyring == "" {
		obj.Keyring = "/etc/ceph/keyring"
	}
}

func SetDefaults_ScaleIOVolumeSource(obj *v1.ScaleIOVolumeSource) {
	if obj.StorageMode == "" {
		obj.StorageMode = "ThinProvisioned"
	}
	if obj.FSType == "" {
		obj.FSType = "xfs"
	}
}

func SetDefaults_ScaleIOPersistentVolumeSource(obj *v1.ScaleIOPersistentVolumeSource) {
	if obj.StorageMode == "" {
		obj.StorageMode = "ThinProvisioned"
	}
	if obj.FSType == "" {
		obj.FSType = "xfs"
	}
}

func SetDefaults_HostPathVolumeSource(obj *v1.HostPathVolumeSource) {
	typeVol := v1.HostPathUnset
	if obj.Type == nil {
		obj.Type = &typeVol
	}
}
