/*
Copyright 2019 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 kops

import (
	"fmt"

	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/kops/pkg/apis/kops/util"
)

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

// Cluster is a specific cluster wrapper
type Cluster struct {
	metav1.TypeMeta   `json:",inline"`
	metav1.ObjectMeta `json:"metadata,omitempty"`

	Spec ClusterSpec `json:"spec,omitempty"`
}

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

// ClusterList is a list of clusters
type ClusterList struct {
	metav1.TypeMeta `json:",inline"`
	metav1.ListMeta `json:"metadata,omitempty"`

	Items []Cluster `json:"items"`
}

// ClusterSpec defines the configuration for a cluster
type ClusterSpec struct {
	// The Channel we are following
	Channel string `json:"channel,omitempty"`
	// Additional addons that should be installed on the cluster
	Addons []AddonSpec `json:"addons,omitempty"`
	// ConfigBase is the path where we store configuration for the cluster
	// This might be different than the location where the cluster spec itself is stored,
	// both because this must be accessible to the cluster,
	// and because it might be on a different cloud or storage system (etcd vs S3)
	ConfigBase string `json:"configBase,omitempty"`
	// The CloudProvider to use (aws or gce)
	CloudProvider string `json:"cloudProvider,omitempty"`
	// GossipConfig for the cluster assuming the use of gossip DNS
	GossipConfig *GossipConfig `json:"gossipConfig,omitempty"`
	// Container runtime to use for Kubernetes
	ContainerRuntime string `json:"containerRuntime,omitempty"`
	// The version of kubernetes to install (optional, and can be a "spec" like stable)
	KubernetesVersion string `json:"kubernetesVersion,omitempty"`
	// Configuration of subnets we are targeting
	Subnets []ClusterSubnetSpec `json:"subnets,omitempty"`
	// Project is the cloud project we should use, required on GCE
	Project string `json:"project,omitempty"`
	// MasterPublicName is the external DNS name for the master nodes
	MasterPublicName string `json:"masterPublicName,omitempty"`
	// MasterInternalName is the internal DNS name for the master nodes
	MasterInternalName string `json:"masterInternalName,omitempty"`
	// NetworkCIDR is the CIDR used for the AWS VPC / GCE Network, or otherwise allocated to k8s
	// This is a real CIDR, not the internal k8s network
	// On AWS, it maps to the VPC CIDR.  It is not required on GCE.
	NetworkCIDR string `json:"networkCIDR,omitempty"`
	// AdditionalNetworkCIDRs is a list of additional CIDR used for the AWS VPC
	// or otherwise allocated to k8s. This is a real CIDR, not the internal k8s network
	// On AWS, it maps to any additional CIDRs added to a VPC.
	AdditionalNetworkCIDRs []string `json:"additionalNetworkCIDRs,omitempty"`
	// NetworkID is an identifier of a network, if we want to reuse/share an existing network (e.g. an AWS VPC)
	NetworkID string `json:"networkID,omitempty"`
	// Topology defines the type of network topology to use on the cluster - default public
	// This is heavily weighted towards AWS for the time being, but should also be agnostic enough
	// to port out to GCE later if needed
	Topology *TopologySpec `json:"topology,omitempty"`
	// SecretStore is the VFS path to where secrets are stored
	SecretStore string `json:"secretStore,omitempty"`
	// KeyStore is the VFS path to where SSL keys and certificates are stored
	KeyStore string `json:"keyStore,omitempty"`
	// ConfigStore is the VFS path to where the configuration (Cluster, InstanceGroups etc) is stored
	ConfigStore string `json:"configStore,omitempty"`
	// DNSZone is the DNS zone we should use when configuring DNS
	// This is because some clouds let us define a managed zone foo.bar, and then have
	// kubernetes.dev.foo.bar, without needing to define dev.foo.bar as a hosted zone.
	// DNSZone will probably be a suffix of the MasterPublicName and MasterInternalName
	// Note that DNSZone can either by the host name of the zone (containing dots),
	// or can be an identifier for the zone.
	DNSZone string `json:"dnsZone,omitempty"`
	// DNSControllerGossipConfig for the cluster assuming the use of gossip DNS
	DNSControllerGossipConfig *DNSControllerGossipConfig `json:"dnsControllerGossipConfig,omitempty"`
	// AdditionalSANs adds additional Subject Alternate Names to apiserver cert that kops generates
	AdditionalSANs []string `json:"additionalSans,omitempty"`
	// ClusterDNSDomain is the suffix we use for internal DNS names (normally cluster.local)
	ClusterDNSDomain string `json:"clusterDNSDomain,omitempty"`
	// ServiceClusterIPRange is the CIDR, from the internal network, where we allocate IPs for services
	ServiceClusterIPRange string `json:"serviceClusterIPRange,omitempty"`
	// PodCIDR is the CIDR from which we allocate IPs for pods
	PodCIDR string `json:"podCIDR,omitempty"`
	// NonMasqueradeCIDR is the CIDR for the internal k8s network (on which pods & services live)
	// It cannot overlap ServiceClusterIPRange
	NonMasqueradeCIDR string `json:"nonMasqueradeCIDR,omitempty"`
	// SSHAccess is a list of the CIDRs that can access SSH.
	SSHAccess []string `json:"sshAccess,omitempty"`
	// NodePortAccess is a list of the CIDRs that can access the node ports range (30000-32767).
	NodePortAccess []string `json:"nodePortAccess,omitempty"`
	// HTTPProxy defines connection information to support use of a private cluster behind an forward HTTP Proxy
	EgressProxy *EgressProxySpec `json:"egressProxy,omitempty"`
	// SSHKeyName specifies a preexisting SSH key to use
	SSHKeyName *string `json:"sshKeyName,omitempty"`
	// KubernetesAPIAccess is a list of the CIDRs that can access the Kubernetes API endpoint (master HTTPS)
	KubernetesAPIAccess []string `json:"kubernetesApiAccess,omitempty"`
	// IsolateMasters determines whether we should lock down masters so that they are not on the pod network.
	// true is the kube-up behaviour, but it is very surprising: it means that daemonsets only work on the master
	// if they have hostNetwork=true.
	// false is now the default, and it will:
	//  * give the master a normal PodCIDR
	//  * run kube-proxy on the master
	//  * enable debugging handlers on the master, so kubectl logs works
	IsolateMasters *bool `json:"isolateMasters,omitempty"`
	// UpdatePolicy determines the policy for applying upgrades automatically.
	// Valid values:
	//   'automatic' (default): apply updates automatically (apply OS security upgrades, avoiding rebooting when possible)
	//   'external': do not apply updates automatically; they are applied manually or by an external system
	UpdatePolicy *string `json:"updatePolicy,omitempty"`
	// ExternalPolicies allows the insertion of pre-existing managed policies on IG Roles
	ExternalPolicies *map[string][]string `json:"externalPolicies,omitempty"`
	// Additional policies to add for roles
	AdditionalPolicies *map[string]string `json:"additionalPolicies,omitempty"`
	// A collection of files assets for deployed cluster wide
	FileAssets []FileAssetSpec `json:"fileAssets,omitempty"`
	// EtcdClusters stores the configuration for each cluster
	EtcdClusters []EtcdClusterSpec `json:"etcdClusters,omitempty"`
	// Component configurations
	Containerd                     *ContainerdConfig             `json:"containerd,omitempty"`
	Docker                         *DockerConfig                 `json:"docker,omitempty"`
	KubeDNS                        *KubeDNSConfig                `json:"kubeDNS,omitempty"`
	KubeAPIServer                  *KubeAPIServerConfig          `json:"kubeAPIServer,omitempty"`
	KubeControllerManager          *KubeControllerManagerConfig  `json:"kubeControllerManager,omitempty"`
	ExternalCloudControllerManager *CloudControllerManagerConfig `json:"cloudControllerManager,omitempty"`
	KubeScheduler                  *KubeSchedulerConfig          `json:"kubeScheduler,omitempty"`
	KubeProxy                      *KubeProxyConfig              `json:"kubeProxy,omitempty"`
	Kubelet                        *KubeletConfigSpec            `json:"kubelet,omitempty"`
	MasterKubelet                  *KubeletConfigSpec            `json:"masterKubelet,omitempty"`
	CloudConfig                    *CloudConfiguration           `json:"cloudConfig,omitempty"`
	ExternalDNS                    *ExternalDNSConfig            `json:"externalDns,omitempty"`
	NTP                            *NTPConfig                    `json:"ntp,omitempty"`

	// NodeTerminationHandler determines the node termination handler configuration.
	NodeTerminationHandler *NodeTerminationHandlerConfig `json:"nodeTerminationHandler,omitempty"`
	// MetricsServer determines the metrics server configuration.
	MetricsServer *MetricsServerConfig `json:"metricsServer,omitempty"`
	// CertManager determines the metrics server configuration.
	CertManager *CertManagerConfig `json:"certManager,omitempty"`
	// AWSLoadbalancerControllerConfig determines the AWS LB controller configuration.
	AWSLoadBalancerController *AWSLoadBalancerControllerConfig `json:"awsLoadBalancerController,omitempty"`

	// Networking configuration
	Networking *NetworkingSpec `json:"networking,omitempty"`
	// API field controls how the API is exposed outside the cluster
	API *AccessSpec `json:"api,omitempty"`
	// Authentication field controls how the cluster is configured for authentication
	Authentication *AuthenticationSpec `json:"authentication,omitempty"`
	// Authorization field controls how the cluster is configured for authorization
	Authorization *AuthorizationSpec `json:"authorization,omitempty"`
	// NodeAuthorization defined the custom node authorization configuration
	NodeAuthorization *NodeAuthorizationSpec `json:"nodeAuthorization,omitempty"`
	// CloudLabels defines additional tags or labels on cloud provider resources
	CloudLabels map[string]string `json:"cloudLabels,omitempty"`
	// Hooks for custom actions e.g. on first installation
	Hooks []HookSpec `json:"hooks,omitempty"`
	// Assets is alternative locations for files and containers; the API under construction, will remove this comment once this API is fully functional.
	Assets *Assets `json:"assets,omitempty"`
	// IAM field adds control over the IAM security policies applied to resources
	IAM *IAMSpec `json:"iam,omitempty"`
	// EncryptionConfig controls if encryption is enabled
	EncryptionConfig *bool `json:"encryptionConfig,omitempty"`
	// DisableSubnetTags controls if subnets are tagged in AWS
	DisableSubnetTags bool `json:"disableSubnetTags,omitempty"`
	// Target allows for us to nest extra config for targets such as terraform
	Target *TargetSpec `json:"target,omitempty"`
	// UseHostCertificates will mount /etc/ssl/certs to inside needed containers.
	// This is needed if some APIs do have self-signed certs
	UseHostCertificates *bool `json:"useHostCertificates,omitempty"`
	// SysctlParameters will configure kernel parameters using sysctl(8). When
	// specified, each parameter must follow the form variable=value, the way
	// it would appear in sysctl.conf.
	SysctlParameters []string `json:"sysctlParameters,omitempty"`
	// RollingUpdate defines the default rolling-update settings for instance groups.
	RollingUpdate *RollingUpdate `json:"rollingUpdate,omitempty"`
	// ClusterAutoscaler defines the cluster autoscaler configuration.
	ClusterAutoscaler *ClusterAutoscalerConfig `json:"clusterAutoscaler,omitempty"`
	// WarmPool defines the default warm pool settings for instance groups (AWS only).
	WarmPool *WarmPoolSpec `json:"warmPool,omitempty"`

	// ServiceAccountIssuerDiscovery configures the OIDC Issuer for ServiceAccounts.
	ServiceAccountIssuerDiscovery *ServiceAccountIssuerDiscoveryConfig `json:"serviceAccountIssuerDiscovery,omitempty"`

	// SnapshotController defines the CSI Snapshot Controller configuration.
	SnapshotController *SnapshotControllerConfig `json:"snapshotController,omitempty"`
}

// ServiceAccountIssuerDiscoveryConfig configures an OIDC Issuer.
type ServiceAccountIssuerDiscoveryConfig struct {
	// DiscoveryStore is the VFS path to where OIDC Issuer Discovery metadata is stored.
	DiscoveryStore string `json:"discoveryStore,omitempty"`
	// EnableAWSOIDCProvider will provision an AWS OIDC provider that trusts the ServiceAccount Issuer
	EnableAWSOIDCProvider bool `json:"enableAWSOIDCProvider,omitempty"`
}

// ServiceAccountExternalPermissions grants a ServiceAccount permissions to external resources.
type ServiceAccountExternalPermission struct {
	// Name is the name of the Kubernetes ServiceAccount.
	Name string `json:"name"`
	// Namespace is the namespace of the Kubernetes ServiceAccount.
	Namespace string `json:"namespace"`
	// AWS grants permissions to AWS resources.
	AWS *AWSPermission `json:"aws,omitempty"`
}

// AWSPermission grants permissions to AWS resources.
type AWSPermission struct {
	// PolicyARNs is a list of existing IAM Policies.
	PolicyARNs []string `json:"policyARNs,omitempty"`
	// InlinePolicy is an IAM Policy that will be attached inline to the IAM Role.
	InlinePolicy string `json:"inlinePolicy,omitempty"`
}

// NodeAuthorizationSpec is used to node authorization
type NodeAuthorizationSpec struct {
	// NodeAuthorizer defined the configuration for the node authorizer
	NodeAuthorizer *NodeAuthorizerSpec `json:"nodeAuthorizer,omitempty"`
}

// NodeAuthorizerSpec defines the configuration for a node authorizer
type NodeAuthorizerSpec struct {
	// Authorizer is the authorizer to use
	Authorizer string `json:"authorizer,omitempty"`
	// Features is a series of authorizer features to enable or disable
	Features []string `json:"features,omitempty"`
	// Image is the location of container
	Image string `json:"image,omitempty"`
	// NodeURL is the node authorization service url
	NodeURL string `json:"nodeURL,omitempty"`
	// Port is the port the service is running on the master
	Port int `json:"port,omitempty"`
	// Interval the time between retires for authorization request
	Interval *metav1.Duration `json:"interval,omitempty"`
	// Timeout the max time for authorization request
	Timeout *metav1.Duration `json:"timeout,omitempty"`
	// TokenTTL is the max ttl for an issued token
	TokenTTL *metav1.Duration `json:"tokenTTL,omitempty"`
}

// AddonSpec defines an addon that we want to install in the cluster
type AddonSpec struct {
	// Manifest is a path to the manifest that defines the addon
	Manifest string `json:"manifest,omitempty"`
}

// FileAssetSpec defines the structure for a file asset
type FileAssetSpec struct {
	// Name is a shortened reference to the asset
	Name string `json:"name,omitempty"`
	// Path is the location this file should reside
	Path string `json:"path,omitempty"`
	// Roles is a list of roles the file asset should be applied, defaults to all
	Roles []InstanceGroupRole `json:"roles,omitempty"`
	// Content is the contents of the file
	Content string `json:"content,omitempty"`
	// IsBase64 indicates the contents is base64 encoded
	IsBase64 bool `json:"isBase64,omitempty"`
}

// Assets defines the privately hosted assets
type Assets struct {
	// ContainerRegistry is a url for to a docker registry
	ContainerRegistry *string `json:"containerRegistry,omitempty"`
	// FileRepository is the url for a private file serving repository
	FileRepository *string `json:"fileRepository,omitempty"`
	// ContainerProxy is a url for a pull-through proxy of a docker registry
	ContainerProxy *string `json:"containerProxy,omitempty"`
}

// IAMSpec adds control over the IAM security policies applied to resources
type IAMSpec struct {
	// TODO: remove Legacy in next APIVersion
	Legacy                 bool    `json:"legacy"`
	AllowContainerRegistry bool    `json:"allowContainerRegistry,omitempty"`
	PermissionsBoundary    *string `json:"permissionsBoundary,omitempty"`
	// ServiceAccountExternalPermissions defines the relatinship between Kubernetes ServiceAccounts and permissions with external resources.
	ServiceAccountExternalPermissions []ServiceAccountExternalPermission `json:"serviceAccountExternalPermissions,omitempty"`
}

// HookSpec is a definition hook
type HookSpec struct {
	// Name is an optional name for the hook, otherwise the name is kops-hook-<index>
	Name string `json:"name,omitempty"`
	// Disabled indicates if you want the unit switched off
	Disabled bool `json:"disabled,omitempty"`
	// Roles is an optional list of roles the hook should be rolled out to, defaults to all
	Roles []InstanceGroupRole `json:"roles,omitempty"`
	// Requires is a series of systemd units the action requires
	Requires []string `json:"requires,omitempty"`
	// Before is a series of systemd units which this hook must run before
	Before []string `json:"before,omitempty"`
	// ExecContainer is the image itself
	ExecContainer *ExecContainerAction `json:"execContainer,omitempty"`
	// Manifest is a raw systemd unit file
	Manifest string `json:"manifest,omitempty"`
	// UseRawManifest indicates that the contents of Manifest should be used as the contents
	// of the systemd unit, unmodified. Before and Requires are ignored when used together
	// with this value (and validation shouldn't allow them to be set)
	UseRawManifest bool `json:"useRawManifest,omitempty"`
}

// ExecContainerAction defines an hood action
type ExecContainerAction struct {
	// Image is the docker image
	Image string `json:"image,omitempty"`
	// Command is the command supplied to the above image
	Command []string `json:"command,omitempty"`
	// Environment is a map of environment variables added to the hook
	Environment map[string]string `json:"environment,omitempty"`
}

type AuthenticationSpec struct {
	Kopeio *KopeioAuthenticationSpec `json:"kopeio,omitempty"`
	Aws    *AwsAuthenticationSpec    `json:"aws,omitempty"`
}

func (s *AuthenticationSpec) IsEmpty() bool {
	return s.Kopeio == nil && s.Aws == nil
}

type KopeioAuthenticationSpec struct {
}

type AwsAuthenticationSpec struct {
	// Image is the AWS IAM Authenticator docker image to use
	Image string `json:"image,omitempty"`
	// BackendMode is the AWS IAM Authenticator backend to use. Default MountedFile
	BackendMode string `json:"backendMode,omitempty"`
	// ClusterID identifies the cluster performing authentication to prevent certain replay attacks. Default master public DNS name
	ClusterID string `json:"clusterID,omitempty"`
	// MemoryRequest memory request of AWS IAM Authenticator container. Default 20Mi
	MemoryRequest *resource.Quantity `json:"memoryRequest,omitempty"`
	// CPURequest CPU request of AWS IAM Authenticator container. Default 10m
	CPURequest *resource.Quantity `json:"cpuRequest,omitempty"`
	// MemoryLimit memory limit of AWS IAM Authenticator container. Default 20Mi
	MemoryLimit *resource.Quantity `json:"memoryLimit,omitempty"`
	// CPULimit CPU limit of AWS IAM Authenticator container. Default 10m
	CPULimit *resource.Quantity `json:"cpuLimit,omitempty"`
}

type AuthorizationSpec struct {
	AlwaysAllow *AlwaysAllowAuthorizationSpec `json:"alwaysAllow,omitempty"`
	RBAC        *RBACAuthorizationSpec        `json:"rbac,omitempty"`
}

func (s *AuthorizationSpec) IsEmpty() bool {
	return s.RBAC == nil && s.AlwaysAllow == nil
}

type RBACAuthorizationSpec struct {
}

type AlwaysAllowAuthorizationSpec struct {
}

// AccessSpec provides configuration details related to kubeapi dns and ELB access
type AccessSpec struct {
	// DNS will be used to provide config on kube-apiserver ELB DNS
	DNS *DNSAccessSpec `json:"dns,omitempty"`
	// LoadBalancer is the configuration for the kube-apiserver ELB
	LoadBalancer *LoadBalancerAccessSpec `json:"loadBalancer,omitempty"`
}

type DNSAccessSpec struct {
}

// LoadBalancerType string describes LoadBalancer types (public, internal)
type LoadBalancerType string

const (
	LoadBalancerTypePublic   LoadBalancerType = "Public"
	LoadBalancerTypeInternal LoadBalancerType = "Internal"
)

// LoadBalancerClass string describes LoadBalancer classes (classic, network)
type LoadBalancerClass string

const (
	LoadBalancerClassClassic LoadBalancerClass = "Classic"
	LoadBalancerClassNetwork LoadBalancerClass = "Network"
)

var SupportedLoadBalancerClasses = []string{
	string(LoadBalancerClassClassic),
	string(LoadBalancerClassNetwork),
}

// LoadBalancerSubnetSpec provides configuration for subnets used for a load balancer
type LoadBalancerSubnetSpec struct {
	// Name specifies the name of the cluster subnet
	Name string `json:"name,omitempty"`
	// PrivateIPv4Address specifies the private IPv4 address to use for a NLB
	PrivateIPv4Address *string `json:"privateIPv4Address,omitempty"`
	// AllocationID specifies the Elastic IP Allocation ID for use by a NLB
	AllocationID *string `json:"allocationId,omitempty"`
}

// LoadBalancerAccessSpec provides configuration details related to API LoadBalancer and its access
type LoadBalancerAccessSpec struct {
	// LoadBalancerClass specifies the class of load balancer to create: Classic, Network.
	Class LoadBalancerClass `json:"class,omitempty"`
	// Type of load balancer to create may Public or Internal.
	Type LoadBalancerType `json:"type,omitempty"`
	// IdleTimeoutSeconds sets the timeout of the api loadbalancer.
	IdleTimeoutSeconds *int64 `json:"idleTimeoutSeconds,omitempty"`
	// SecurityGroupOverride overrides the default Kops created SG for the load balancer.
	SecurityGroupOverride *string `json:"securityGroupOverride,omitempty"`
	// AdditionalSecurityGroups attaches additional security groups (e.g. sg-123456).
	AdditionalSecurityGroups []string `json:"additionalSecurityGroups,omitempty"`
	// UseForInternalApi indicates whether the LB should be used by the kubelet
	UseForInternalApi bool `json:"useForInternalApi,omitempty"`
	// SSLCertificate allows you to specify the ACM cert to be used the LB
	SSLCertificate string `json:"sslCertificate,omitempty"`
	// SSLPolicy allows you to overwrite the LB listener's Security Policy
	SSLPolicy *string `json:"sslPolicy,omitempty"`
	// CrossZoneLoadBalancing allows you to enable the cross zone load balancing
	CrossZoneLoadBalancing *bool `json:"crossZoneLoadBalancing,omitempty"`
	// Subnets allows you to specify the subnets that must be used for the load balancer
	Subnets []LoadBalancerSubnetSpec `json:"subnets,omitempty"`
}

// KubeDNSConfig defines the kube dns configuration
type KubeDNSConfig struct {
	// CacheMaxSize is the maximum entries to keep in dnsmasq
	CacheMaxSize int `json:"cacheMaxSize,omitempty"`
	// CacheMaxConcurrent is the maximum number of concurrent queries for dnsmasq
	CacheMaxConcurrent int `json:"cacheMaxConcurrent,omitempty"`
	// CoreDNSImage is used to override the default image used for CoreDNS
	CoreDNSImage string `json:"coreDNSImage,omitempty"`
	// CPAImage is used to override the default image used for Cluster Proportional Autoscaler
	CPAImage string `json:"cpaImage,omitempty"`
	// Domain is the dns domain
	Domain string `json:"domain,omitempty"`
	// ExternalCoreFile is used to provide a complete CoreDNS CoreFile by the user - ignores other provided flags which modify the CoreFile.
	ExternalCoreFile string `json:"externalCoreFile,omitempty"`
	// Image is the name of the docker image to run - @deprecated as this is now in the addon
	Image string `json:"image,omitempty"`
	// Replicas is the number of pod replicas - @deprecated as this is now in the addon and controlled by autoscaler
	Replicas int `json:"replicas,omitempty"`
	// Provider indicates whether CoreDNS or kube-dns will be the default service discovery.
	Provider string `json:"provider,omitempty"`
	// ServerIP is the server ip
	ServerIP string `json:"serverIP,omitempty"`
	// StubDomains redirects a domains to another DNS service
	StubDomains map[string][]string `json:"stubDomains,omitempty"`
	// UpstreamNameservers sets the upstream nameservers for queries not on the cluster domain
	UpstreamNameservers []string `json:"upstreamNameservers,omitempty"`
	// MemoryRequest specifies the memory requests of each dns container in the cluster. Default 70m.
	MemoryRequest *resource.Quantity `json:"memoryRequest,omitempty"`
	// CPURequest specifies the cpu requests of each dns container in the cluster. Default 100m.
	CPURequest *resource.Quantity `json:"cpuRequest,omitempty"`
	// MemoryLimit specifies the memory limit of each dns container in the cluster. Default 170m.
	MemoryLimit *resource.Quantity `json:"memoryLimit,omitempty"`
	// NodeLocalDNS specifies the configuration for the node-local-dns addon
	NodeLocalDNS *NodeLocalDNSConfig `json:"nodeLocalDNS,omitempty"`
}

// NodeLocalDNSConfig are options of the node-local-dns
type NodeLocalDNSConfig struct {
	// Enabled activates the node-local-dns addon
	Enabled *bool `json:"enabled,omitempty"`
	// Local listen IP address. It can be any IP in the 169.254.20.0/16 space or any other IP address that can be guaranteed to not collide with any existing IP.
	LocalIP string `json:"localIP,omitempty"`
	// If enabled, nodelocal dns will use kubedns as a default upstream
	ForwardToKubeDNS *bool `json:"forwardToKubeDNS,omitempty"`
	// MemoryRequest specifies the memory requests of each node-local-dns container in the daemonset. Default 5Mi.
	MemoryRequest *resource.Quantity `json:"memoryRequest,omitempty"`
	// CPURequest specifies the cpu requests of each node-local-dns container in the daemonset. Default 25m.
	CPURequest *resource.Quantity `json:"cpuRequest,omitempty"`
}

// ExternalDNSConfig are options of the dns-controller
type ExternalDNSConfig struct {
	// Disable indicates we do not wish to run the dns-controller addon
	Disable bool `json:"disable,omitempty"`
	// WatchIngress indicates you want the dns-controller to watch and create dns entries for ingress resources
	WatchIngress *bool `json:"watchIngress,omitempty"`
	// WatchNamespace is namespace to watch, defaults to all (use to control whom can creates dns entries)
	WatchNamespace string `json:"watchNamespace,omitempty"`
}

// EtcdProviderType describes etcd cluster provisioning types (Standalone, Manager)
type EtcdProviderType string

const (
	EtcdProviderTypeManager EtcdProviderType = "Manager"
	EtcdProviderTypeLegacy  EtcdProviderType = "Legacy"
)

var SupportedEtcdProviderTypes = []string{
	string(EtcdProviderTypeManager),
	string(EtcdProviderTypeLegacy),
}

// EtcdClusterSpec is the etcd cluster specification
type EtcdClusterSpec struct {
	// Name is the name of the etcd cluster (main, events etc)
	Name string `json:"name,omitempty"`
	// Provider is the provider used to run etcd: Manager, Legacy.
	// Defaults to Manager.
	Provider EtcdProviderType `json:"provider,omitempty"`
	// Members stores the configurations for each member of the cluster (including the data volume)
	Members []EtcdMemberSpec `json:"etcdMembers,omitempty"`
	// EnableEtcdTLS indicates the etcd service should use TLS between peers and clients
	EnableEtcdTLS bool `json:"enableEtcdTLS,omitempty"`
	// EnableTLSAuth indicates client and peer TLS auth should be enforced
	EnableTLSAuth bool `json:"enableTLSAuth,omitempty"`
	// Version is the version of etcd to run.
	Version string `json:"version,omitempty"`
	// LeaderElectionTimeout is the time (in milliseconds) for an etcd leader election timeout
	LeaderElectionTimeout *metav1.Duration `json:"leaderElectionTimeout,omitempty"`
	// HeartbeatInterval is the time (in milliseconds) for an etcd heartbeat interval
	HeartbeatInterval *metav1.Duration `json:"heartbeatInterval,omitempty"`
	// Image is the etcd docker image to use. Setting this will ignore the Version specified.
	Image string `json:"image,omitempty"`
	// Backups describes how we do backups of etcd
	Backups *EtcdBackupSpec `json:"backups,omitempty"`
	// Manager describes the manager configuration
	Manager *EtcdManagerSpec `json:"manager,omitempty"`
	// MemoryRequest specifies the memory requests of each etcd container in the cluster.
	MemoryRequest *resource.Quantity `json:"memoryRequest,omitempty"`
	// CPURequest specifies the cpu requests of each etcd container in the cluster.
	CPURequest *resource.Quantity `json:"cpuRequest,omitempty"`
}

// EtcdBackupSpec describes how we want to do backups of etcd
type EtcdBackupSpec struct {
	// BackupStore is the VFS path where we will read/write backup data
	BackupStore string `json:"backupStore,omitempty"`
	// Image is the etcd backup manager image to use.  Setting this will create a sidecar container in the etcd pod with the specified image.
	Image string `json:"image,omitempty"`
}

// EtcdManagerSpec describes how we configure the etcd manager
type EtcdManagerSpec struct {
	// Image is the etcd manager image to use.
	Image string `json:"image,omitempty"`
	// Env allows users to pass in env variables to the etcd-manager container.
	// Variables starting with ETCD_ will be further passed down to the etcd process.
	// This allows etcd setting to be overwriten. No config validation is done.
	// A list of etcd config ENV vars can be found at https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/configuration.md
	Env []EnvVar `json:"env,omitempty"`
	// DiscoveryPollInterval which is used for discovering other cluster members. The default is 60 seconds.
	DiscoveryPollInterval *string `json:"discoveryPollInterval,omitempty"`
	// LogLevel allows the klog library verbose log level to be set for etcd-manager. The default is 6.
	// https://github.com/google/glog#verbose-logging
	LogLevel *int32 `json:"logLevel,omitempty"`
}

// EtcdMemberSpec is a specification for a etcd member
type EtcdMemberSpec struct {
	// Name is the name of the member within the etcd cluster
	Name string `json:"name,omitempty"`
	// InstanceGroup is the instanceGroup this volume is associated
	InstanceGroup *string `json:"instanceGroup,omitempty"`
	// VolumeType is the underlying cloud storage class
	VolumeType *string `json:"volumeType,omitempty"`
	// If volume type is io1, then we need to specify the number of Iops.
	VolumeIops *int32 `json:"volumeIops,omitempty"`
	// Parameter for disks that support provisioned throughput
	VolumeThroughput *int32 `json:"volumeThroughput,omitempty"`
	// VolumeSize is the underlying cloud volume size
	VolumeSize *int32 `json:"volumeSize,omitempty"`
	// KmsKeyId is a AWS KMS ID used to encrypt the volume
	KmsKeyId *string `json:"kmsKeyId,omitempty"`
	// EncryptedVolume indicates you want to encrypt the volume
	EncryptedVolume *bool `json:"encryptedVolume,omitempty"`
}

// SubnetType string describes subnet types (public, private, utility)
type SubnetType string

const (
	// SubnetTypePublic means the subnet is public
	SubnetTypePublic SubnetType = "Public"
	// SubnetTypePrivate means the subnet has no public address or is natted
	SubnetTypePrivate SubnetType = "Private"
	// SubnetTypeUtility mean the subnet is used for utility services, such as the bastion
	SubnetTypeUtility SubnetType = "Utility"
)

const (
	// EgressNatGateway means that egress configuration is using an existing NAT Gateway
	EgressNatGateway = "nat"
	// EgressElasticIP means that egress configuration is using a NAT Gateway with an existing Elastic IP
	EgressElasticIP = "eipalloc"
	// EgressNatInstance means that egress configuration is using an existing NAT Instance
	EgressNatInstance = "i"
	// EgressTransitGateway means that egress configuration is using a Transit Gateway
	EgressTransitGateway = "tgw"
	// EgressExternal means that egress configuration is done externally (preconfigured)
	EgressExternal = "External"
)

// ClusterSubnetSpec defines a subnet
type ClusterSubnetSpec struct {
	// Name is the name of the subnet
	Name string `json:"name,omitempty"`
	// CIDR is the network cidr of the subnet
	CIDR string `json:"cidr,omitempty"`
	// Zone is the zone the subnet is in, set for subnets that are zonally scoped
	Zone string `json:"zone,omitempty"`
	// Region is the region the subnet is in, set for subnets that are regionally scoped
	Region string `json:"region,omitempty"`
	// ProviderID is the cloud provider id for the objects associated with the zone (the subnet on AWS)
	ProviderID string `json:"id,omitempty"`
	// Egress defines the method of traffic egress for this subnet
	Egress string `json:"egress,omitempty"`
	// Type define which one if the internal types (public, utility, private) the network is
	Type SubnetType `json:"type,omitempty"`
	// PublicIP to attach to NatGateway
	PublicIP string `json:"publicIP,omitempty"`
}

type EgressProxySpec struct {
	HTTPProxy     HTTPProxy `json:"httpProxy,omitempty"`
	ProxyExcludes string    `json:"excludes,omitempty"`
}

type HTTPProxy struct {
	Host string `json:"host,omitempty"`
	Port int    `json:"port,omitempty"`
	// TODO #3070
	// User     string `json:"user,omitempty"`
	// Password string `json:"password,omitempty"`
}

// TargetSpec allows for specifying target config in an extensible way
type TargetSpec struct {
	Terraform *TerraformSpec `json:"terraform,omitempty"`
}

func (t *TargetSpec) IsEmpty() bool {
	return t.Terraform == nil
}

// TerraformSpec allows us to specify terraform config in an extensible way
type TerraformSpec struct {
	// ProviderExtraConfig contains key/value pairs to add to the rendered terraform "provider" block
	ProviderExtraConfig *map[string]string `json:"providerExtraConfig,omitempty"`
}

func (t *TerraformSpec) IsEmpty() bool {
	return t.ProviderExtraConfig == nil
}

// FillDefaults populates default values.
// This is different from PerformAssignments, because these values are changeable, and thus we don't need to
// store them (i.e. we don't need to 'lock them')
func (c *Cluster) FillDefaults() error {
	// Topology support
	if c.Spec.Topology == nil {
		c.Spec.Topology = &TopologySpec{Masters: TopologyPublic, Nodes: TopologyPublic}
		c.Spec.Topology.DNS = &DNSSpec{Type: DNSTypePublic}
	}

	if c.Spec.Networking == nil {
		c.Spec.Networking = &NetworkingSpec{}
	}

	c.fillClusterSpecNetworkingSpec()

	if c.Spec.Channel == "" {
		c.Spec.Channel = DefaultChannel
	}

	if c.ObjectMeta.Name == "" {
		return fmt.Errorf("cluster Name not set in FillDefaults")
	}

	if c.Spec.MasterInternalName == "" {
		c.Spec.MasterInternalName = "api.internal." + c.ObjectMeta.Name
	}

	if c.Spec.MasterPublicName == "" {
		c.Spec.MasterPublicName = "api." + c.ObjectMeta.Name
	}

	return nil
}

// fillClusterSpecNetworking provides default value if c.Spec.NetworkingSpec is nil
func (c *Cluster) fillClusterSpecNetworkingSpec() {
	if c.Spec.Networking.Kubenet != nil {
		// OK
	} else if c.Spec.Networking.CNI != nil {
		// OK
	} else if c.Spec.Networking.External != nil {
		// OK
	} else if c.Spec.Networking.Kopeio != nil {
		// OK
	} else if c.Spec.Networking.Weave != nil {
		// OK
	} else if c.Spec.Networking.Flannel != nil {
		// OK
	} else if c.Spec.Networking.Calico != nil {
		// OK
	} else if c.Spec.Networking.Canal != nil {
		// OK
	} else if c.Spec.Networking.Kuberouter != nil {
		// OK
	} else if c.Spec.Networking.AmazonVPC != nil {
		// OK
	} else if c.Spec.Networking.Cilium != nil {
		// OK
	} else if c.Spec.Networking.LyftVPC != nil {
		// OK
	} else if c.Spec.Networking.GCE != nil {
		// OK
	} else {
		// No networking model selected; choose Kubenet
		c.Spec.Networking.Kubenet = &KubenetNetworkingSpec{}
	}
}

// SharedVPC is a simple helper function which makes the templates for a shared VPC clearer
func (c *Cluster) SharedVPC() bool {
	return c.Spec.NetworkID != ""
}

// IsKubernetesGTE checks if the version is >= the specified version.
// It panics if the kubernetes version in the cluster is invalid, or if the version is invalid.
func (c *Cluster) IsKubernetesGTE(version string) bool {
	clusterVersion, err := util.ParseKubernetesVersion(c.Spec.KubernetesVersion)
	if err != nil || clusterVersion == nil {
		panic(fmt.Sprintf("error parsing cluster spec.kubernetesVersion %q", c.Spec.KubernetesVersion))
	}

	parsedVersion, err := util.ParseKubernetesVersion(version)
	if err != nil {
		panic(fmt.Sprintf("Error parsing version %s: %v", version, err))
	}

	// Ignore Pre & Build fields
	clusterVersion.Pre = nil
	clusterVersion.Build = nil

	return clusterVersion.GTE(*parsedVersion)
}

// IsKubernetesLT checks if the version is < the specified version.
// It panics if the kubernetes version in the cluster is invalid, or if the version is invalid.
func (c *Cluster) IsKubernetesLT(version string) bool {
	return !c.IsKubernetesGTE(version)
}

// IsSharedAzureResourceGroup returns true if the resource group is shared.
func (c *Cluster) IsSharedAzureResourceGroup() bool {
	return c.Spec.CloudConfig.Azure.ResourceGroupName != ""
}

// AzureResourceGroupName returns the name of the resource group where the cluster is built.
func (c *Cluster) AzureResourceGroupName() string {
	r := c.Spec.CloudConfig.Azure.ResourceGroupName
	if r != "" {
		return r
	}
	return c.Name
}

// IsSharedAzureRouteTable returns true if the route table is shared.
func (c *Cluster) IsSharedAzureRouteTable() bool {
	return c.Spec.CloudConfig.Azure.RouteTableName != ""
}

// EnvVar represents an environment variable present in a Container.
type EnvVar struct {
	// Name of the environment variable. Must be a C_IDENTIFIER.
	Name string `json:"name"`

	// Variable references $(VAR_NAME) are expanded
	// using the previous defined environment variables in the container and
	// any service environment variables. If a variable cannot be resolved,
	// the reference in the input string will be unchanged. The $(VAR_NAME)
	// syntax can be escaped with a double $$, ie: $$(VAR_NAME). Escaped
	// references will never be expanded, regardless of whether the variable
	// exists or not.
	// Defaults to "".
	// +optional
	Value string `json:"value,omitempty"`
}

type GossipConfig struct {
	Protocol  *string                `json:"protocol,omitempty"`
	Listen    *string                `json:"listen,omitempty"`
	Secret    *string                `json:"secret,omitempty"`
	Secondary *GossipConfigSecondary `json:"secondary,omitempty"`
}

type GossipConfigSecondary struct {
	Protocol *string `json:"protocol,omitempty"`
	Listen   *string `json:"listen,omitempty"`
	Secret   *string `json:"secret,omitempty"`
}

type DNSControllerGossipConfig struct {
	Protocol  *string                             `json:"protocol,omitempty"`
	Listen    *string                             `json:"listen,omitempty"`
	Secret    *string                             `json:"secret,omitempty"`
	Secondary *DNSControllerGossipConfigSecondary `json:"secondary,omitempty"`
	Seed      *string                             `json:"seed,omitempty"`
}

type DNSControllerGossipConfigSecondary struct {
	Protocol *string `json:"protocol,omitempty"`
	Listen   *string `json:"listen,omitempty"`
	Secret   *string `json:"secret,omitempty"`
	Seed     *string `json:"seed,omitempty"`
}

type RollingUpdate struct {
	// DrainAndTerminate enables draining and terminating nodes during rolling updates.
	// Defaults to true.
	DrainAndTerminate *bool `json:"drainAndTerminate,omitempty"`
	// MaxUnavailable is the maximum number of nodes that can be unavailable during the update.
	// The value can be an absolute number (for example 5) or a percentage of desired
	// nodes (for example 10%).
	// The absolute number is calculated from a percentage by rounding down.
	// Defaults to 1 if MaxSurge is 0, otherwise defaults to 0.
	// Example: when this is set to 30%, the InstanceGroup can be scaled
	// down to 70% of desired nodes immediately when the rolling update
	// starts. Once new nodes are ready, more old nodes can be drained,
	// ensuring that the total number of nodes available at all times
	// during the update is at least 70% of desired nodes.
	// +optional
	MaxUnavailable *intstr.IntOrString `json:"maxUnavailable,omitempty"`
	// MaxSurge is the maximum number of extra nodes that can be created
	// during the update.
	// The value can be an absolute number (for example 5) or a percentage of
	// desired machines (for example 10%).
	// The absolute number is calculated from a percentage by rounding up.
	// Has no effect on instance groups with role "Master".
	// Defaults to 1 on AWS, 0 otherwise.
	// Example: when this is set to 30%, the InstanceGroup can be scaled
	// up immediately when the rolling update starts, such that the total
	// number of old and new nodes do not exceed 130% of desired
	// nodes.
	// +optional
	MaxSurge *intstr.IntOrString `json:"maxSurge,omitempty"`
}

type PackagesConfig struct {
	// HashAmd64 overrides the hash for the AMD64 package.
	HashAmd64 *string `json:"hashAmd64,omitempty"`
	// HashArm64 overrides the hash for the ARM64 package.
	HashArm64 *string `json:"hashArm64,omitempty"`
	// UrlAmd64 overrides the URL for the AMD64 package.
	UrlAmd64 *string `json:"urlAmd64,omitempty"`
	// UrlArm64 overrides the URL for the ARM64 package.
	UrlArm64 *string `json:"urlArm64,omitempty"`
}

type WarmPoolSpec struct {
	// MinSize is the minimum size of the warm pool.
	MinSize int64 `json:"minSize,omitempty"`
	// MaxSize is the maximum size of the warm pool. The desired size of the instance group
	// is subtracted from this number to determine the desired size of the warm pool
	// (unless the resulting number is smaller than MinSize).
	// The default is the instance group's MaxSize.
	MaxSize *int64 `json:"maxSize,omitempty"`
	// EnableLifecyleHook determines if an ASG lifecycle hook will be added ensuring that nodeup runs to completion.
	// Note that the metadata API must be protected from arbitrary Pods when this is enabled.
	EnableLifecycleHook bool `json:"enableLifecycleHook,omitempty"`
}

func (in *WarmPoolSpec) IsEnabled() bool {
	return in != nil && (in.MaxSize == nil || *in.MaxSize != 0)
}

func (in *WarmPoolSpec) ResolveDefaults(ig *InstanceGroup) *WarmPoolSpec {
	igWarmPool := ig.Spec.WarmPool
	if igWarmPool == nil {
		if in == nil || (ig.Spec.Role == InstanceGroupRoleMaster || ig.Spec.Role == InstanceGroupRoleBastion) {
			var zero int64
			return &WarmPoolSpec{
				MaxSize: &zero,
			}
		}
		return in
	}

	if in == nil || (ig.Spec.Role == InstanceGroupRoleMaster || ig.Spec.Role == InstanceGroupRoleBastion) {
		return igWarmPool
	}

	spec := *igWarmPool
	if spec.MaxSize == nil {
		spec.MaxSize = in.MaxSize
	}
	if spec.MinSize == 0 {
		spec.MinSize = in.MinSize
	}
	if !spec.EnableLifecycleHook {
		spec.EnableLifecycleHook = in.EnableLifecycleHook
	}
	return &spec
}
