package v1alpha1

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

const (
	ResourceKindCluster      = "Cluster"
	ResourcesSingularCluster = "cluster"
	ResourcesPluralCluster   = "clusters"

	IsHostCluster = "cluster.kubesphere.io/is-host-cluster"
	// Description of which region the cluster been placed
	ClusterRegion = "cluster.kubesphere.io/region"
	// Name of the cluster group
	ClusterGroup = "cluster.kubesphere.io/group"

	Finalizer = "finalizer.cluster.kubesphere.io"
)

type ClusterSpec struct {

	// Join cluster as a kubefed cluster
	JoinFederation bool `json:"joinFederation,omitempty"`

	// Desired state of the cluster
	Enable bool `json:"enable,omitempty"`

	// Provider of the cluster, this field is just for description
	Provider string `json:"provider,omitempty"`

	// Connection holds info to connect to the member cluster
	Connection Connection `json:"connection,omitempty"`
}

type ConnectionType string

const (
	ConnectionTypeDirect ConnectionType = "direct"
	ConnectionTypeProxy  ConnectionType = "proxy"
)

type Connection struct {

	// type defines how host cluster will connect to host cluster
	// ConnectionTypeDirect means direct connection, this requires
	//   kubeconfig and kubesphere apiserver endpoint provided
	// ConnectionTypeProxy means using kubesphere proxy, no kubeconfig
	//   or kubesphere apiserver endpoint required
	Type ConnectionType `json:"type,omitempty"`

	// KubeSphere API Server endpoint. Example: http://10.10.0.11:8080
	// Should provide this field explicitly if connection type is direct.
	// Will be populated by ks-apiserver if connection type is proxy.
	KubeSphereAPIEndpoint string `json:"kubesphereAPIEndpoint,omitempty"`

	// Kubernetes API Server endpoint. Example: https://10.10.0.1:6443
	// Should provide this field explicitly if connection type is direct.
	// Will be populated by ks-apiserver if connection type is proxy.
	KubernetesAPIEndpoint string `json:"kubernetesAPIEndpoint,omitempty"`

	// KubeConfig content used to connect to cluster api server
	// Should provide this field explicitly if connection type is direct.
	// Will be populated by ks-proxy if connection type is proxy.
	KubeConfig []byte `json:"kubeconfig,omitempty"`

	// Token used by agents of member cluster to connect to host cluster proxy.
	// This field is populated by apiserver only if connection type is proxy.
	Token string `json:"token,omitempty"`

	// KubeAPIServerPort is the port which listens for forwarding kube-apiserver traffic
	// Only applicable when connection type is proxy.
	KubernetesAPIServerPort uint16 `json:"kubernetesAPIServerPort,omitempty"`

	// KubeSphereAPIServerPort is the port which listens for forwarding kubesphere apigateway traffic
	// Only applicable when connection type is proxy.
	KubeSphereAPIServerPort uint16 `json:"kubesphereAPIServerPort,omitempty"`
}

type ClusterConditionType string

const (
	// Cluster agent is initialized and waiting for connecting
	ClusterInitialized ClusterConditionType = "Initialized"

	// Cluster agent is available
	ClusterAgentAvailable ClusterConditionType = "AgentAvailable"

	// Cluster has been one of federated clusters
	ClusterFederated ClusterConditionType = "Federated"

	// Cluster is all available for requests
	ClusterReady ClusterConditionType = "Ready"
)

type ClusterCondition struct {
	// Type of the condition
	Type ClusterConditionType `json:"type"`
	// Status of the condition, one of True, False, Unknown.
	Status v1.ConditionStatus `json:"status"`
	// The last time this condition was updated.
	LastUpdateTime metav1.Time `json:"lastUpdateTime,omitempty"`
	// Last time the condition transitioned from one status to another.
	LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty"`
	// The reason for the condition's last transition.
	Reason string `json:"reason,omitempty"`
	// A human readable message indicating details about the transition.
	Message string `json:"message,omitempty"`
}

type ClusterStatus struct {

	// Represents the latest available observations of a cluster's current state.
	Conditions []ClusterCondition `json:"conditions,omitempty"`

	// GitVersion of the kubernetes cluster, this field is populated by cluster controller
	KubernetesVersion string `json:"kubernetesVersion,omitempty"`

	// Count of the kubernetes cluster nodes
	// This field may not reflect the instant status of the cluster.
	NodeCount int `json:"nodeCount,omitempty"`

	// Zones are the names of availability zones in which the nodes of the cluster exist, e.g. 'us-east1-a'.
	// +optional
	Zones []string `json:"zones,omitempty"`

	// Region is the name of the region in which all of the nodes in the cluster exist.  e.g. 'us-east1'.
	// +optional
	Region *string `json:"region,omitempty"`

	// Configz is status of components enabled in the member cluster. This is synchronized with member cluster
	// every amount of time, like 5 minutes.
	// +optional
	Configz map[string]bool `json:"configz,omitempty"`
}

// +genclient
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// +k8s:openapi-gen=true
// +genclient:nonNamespaced
// +kubebuilder:printcolumn:name="Federated",type="boolean",JSONPath=".spec.joinFederation"
// +kubebuilder:printcolumn:name="Provider",type="string",JSONPath=".spec.provider"
// +kubebuilder:printcolumn:name="Active",type="boolean",JSONPath=".spec.enable"
// +kubebuilder:printcolumn:name="Version",type="string",JSONPath=".status.kubernetesVersion"
// +kubebuilder:resource:scope=Cluster

// Cluster is the schema for the clusters API
type Cluster struct {
	metav1.TypeMeta   `json:",inline"`
	metav1.ObjectMeta `json:"metadata,omitempty"`

	Spec   ClusterSpec   `json:"spec,omitempty"`
	Status ClusterStatus `json:"status,omitempty"`
}

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

type ClusterList struct {
	metav1.TypeMeta `json:",inline"`
	metav1.ListMeta `json:"metadata,omitempty"`
	Items           []Cluster `json:"items"`
}

func init() {
	SchemeBuilder.Register(&Cluster{}, &ClusterList{})
}