/*
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 v1beta1

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

// CustomResourceDefinitionSpec describes how a user wants their resource to appear
type CustomResourceDefinitionSpec struct {
	// Group is the group this resource belongs in
	Group string `json:"group" protobuf:"bytes,1,opt,name=group"`
	// Version is the version this resource belongs in
	Version string `json:"version" protobuf:"bytes,2,opt,name=version"`
	// Names are the names used to describe this custom resource
	Names CustomResourceDefinitionNames `json:"names" protobuf:"bytes,3,opt,name=names"`
	// Scope indicates whether this resource is cluster or namespace scoped.  Default is namespaced
	Scope ResourceScope `json:"scope" protobuf:"bytes,4,opt,name=scope,casttype=ResourceScope"`
	// Validation describes the validation methods for CustomResources
	// +optional
	Validation *CustomResourceValidation `json:"validation,omitempty" protobuf:"bytes,5,opt,name=validation"`
	// Subresources describes the subresources for CustomResources
	// This field is alpha-level and should only be sent to servers that enable
	// subresources via the CustomResourceSubresources feature gate.
	// +optional
	Subresources *CustomResourceSubresources `json:"subresources,omitempty" protobuf:"bytes,6,opt,name=subresources"`
}

// CustomResourceDefinitionNames indicates the names to serve this CustomResourceDefinition
type CustomResourceDefinitionNames struct {
	// Plural is the plural name of the resource to serve.  It must match the name of the CustomResourceDefinition-registration
	// too: plural.group and it must be all lowercase.
	Plural string `json:"plural" protobuf:"bytes,1,opt,name=plural"`
	// Singular is the singular name of the resource.  It must be all lowercase  Defaults to lowercased <kind>
	Singular string `json:"singular,omitempty" protobuf:"bytes,2,opt,name=singular"`
	// ShortNames are short names for the resource.  It must be all lowercase.
	ShortNames []string `json:"shortNames,omitempty" protobuf:"bytes,3,opt,name=shortNames"`
	// Kind is the serialized kind of the resource.  It is normally CamelCase and singular.
	Kind string `json:"kind" protobuf:"bytes,4,opt,name=kind"`
	// ListKind is the serialized kind of the list for this resource.  Defaults to <kind>List.
	ListKind string `json:"listKind,omitempty" protobuf:"bytes,5,opt,name=listKind"`
	// Categories is a list of grouped resources custom resources belong to (e.g. 'all')
	// +optional
	Categories []string `json:"categories,omitempty" protobuf:"bytes,6,rep,name=categories"`
}

// ResourceScope is an enum defining the different scopes available to a custom resource
type ResourceScope string

const (
	ClusterScoped   ResourceScope = "Cluster"
	NamespaceScoped ResourceScope = "Namespaced"
)

type ConditionStatus string

// These are valid condition statuses. "ConditionTrue" means a resource is in the condition.
// "ConditionFalse" means a resource is not in the condition. "ConditionUnknown" means kubernetes
// can't decide if a resource is in the condition or not. In the future, we could add other
// intermediate conditions, e.g. ConditionDegraded.
const (
	ConditionTrue    ConditionStatus = "True"
	ConditionFalse   ConditionStatus = "False"
	ConditionUnknown ConditionStatus = "Unknown"
)

// CustomResourceDefinitionConditionType is a valid value for CustomResourceDefinitionCondition.Type
type CustomResourceDefinitionConditionType string

const (
	// Established means that the resource has become active. A resource is established when all names are
	// accepted without a conflict for the first time. A resource stays established until deleted, even during
	// a later NamesAccepted due to changed names. Note that not all names can be changed.
	Established CustomResourceDefinitionConditionType = "Established"
	// NamesAccepted means the names chosen for this CustomResourceDefinition do not conflict with others in
	// the group and are therefore accepted.
	NamesAccepted CustomResourceDefinitionConditionType = "NamesAccepted"
	// Terminating means that the CustomResourceDefinition has been deleted and is cleaning up.
	Terminating CustomResourceDefinitionConditionType = "Terminating"
)

// CustomResourceDefinitionCondition contains details for the current condition of this pod.
type CustomResourceDefinitionCondition struct {
	// Type is the type of the condition.
	Type CustomResourceDefinitionConditionType `json:"type" protobuf:"bytes,1,opt,name=type,casttype=CustomResourceDefinitionConditionType"`
	// Status is the status of the condition.
	// Can be True, False, Unknown.
	Status ConditionStatus `json:"status" protobuf:"bytes,2,opt,name=status,casttype=ConditionStatus"`
	// Last time the condition transitioned from one status to another.
	// +optional
	LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" protobuf:"bytes,3,opt,name=lastTransitionTime"`
	// Unique, one-word, CamelCase reason for the condition's last transition.
	// +optional
	Reason string `json:"reason,omitempty" protobuf:"bytes,4,opt,name=reason"`
	// Human-readable message indicating details about last transition.
	// +optional
	Message string `json:"message,omitempty" protobuf:"bytes,5,opt,name=message"`
}

// CustomResourceDefinitionStatus indicates the state of the CustomResourceDefinition
type CustomResourceDefinitionStatus struct {
	// Conditions indicate state for particular aspects of a CustomResourceDefinition
	Conditions []CustomResourceDefinitionCondition `json:"conditions" protobuf:"bytes,1,opt,name=conditions"`

	// AcceptedNames are the names that are actually being used to serve discovery
	// They may be different than the names in spec.
	AcceptedNames CustomResourceDefinitionNames `json:"acceptedNames" protobuf:"bytes,2,opt,name=acceptedNames"`
}

// CustomResourceCleanupFinalizer is the name of the finalizer which will delete instances of
// a CustomResourceDefinition
const CustomResourceCleanupFinalizer = "customresourcecleanup.apiextensions.k8s.io"

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

// CustomResourceDefinition represents a resource that should be exposed on the API server.  Its name MUST be in the format
// <.spec.name>.<.spec.group>.
type CustomResourceDefinition struct {
	metav1.TypeMeta   `json:",inline"`
	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Spec describes how the user wants the resources to appear
	Spec CustomResourceDefinitionSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
	// Status indicates the actual state of the CustomResourceDefinition
	Status CustomResourceDefinitionStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}

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

// CustomResourceDefinitionList is a list of CustomResourceDefinition objects.
type CustomResourceDefinitionList struct {
	metav1.TypeMeta `json:",inline"`
	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Items individual CustomResourceDefinitions
	Items []CustomResourceDefinition `json:"items" protobuf:"bytes,2,rep,name=items"`
}

// CustomResourceValidation is a list of validation methods for CustomResources.
type CustomResourceValidation struct {
	// OpenAPIV3Schema is the OpenAPI v3 schema to be validated against.
	OpenAPIV3Schema *JSONSchemaProps `json:"openAPIV3Schema,omitempty" protobuf:"bytes,1,opt,name=openAPIV3Schema"`
}

// CustomResourceSubresources defines the status and scale subresources for CustomResources.
type CustomResourceSubresources struct {
	// Status denotes the status subresource for CustomResources
	Status *CustomResourceSubresourceStatus `json:"status,omitempty" protobuf:"bytes,1,opt,name=status"`
	// Scale denotes the scale subresource for CustomResources
	Scale *CustomResourceSubresourceScale `json:"scale,omitempty" protobuf:"bytes,2,opt,name=scale"`
}

// CustomResourceSubresourceStatus defines how to serve the status subresource for CustomResources.
// Status is represented by the `.status` JSON path inside of a CustomResource. When set,
// * exposes a /status subresource for the custom resource
// * PUT requests to the /status subresource take a custom resource object, and ignore changes to anything except the status stanza
// * PUT/POST/PATCH requests to the custom resource ignore changes to the status stanza
type CustomResourceSubresourceStatus struct{}

// CustomResourceSubresourceScale defines how to serve the scale subresource for CustomResources.
type CustomResourceSubresourceScale struct {
	// SpecReplicasPath defines the JSON path inside of a CustomResource that corresponds to Scale.Spec.Replicas.
	// Only JSON paths without the array notation are allowed.
	// Must be a JSON Path under .spec.
	// If there is no value under the given path in the CustomResource, the /scale subresource will return an error on GET.
	SpecReplicasPath string `json:"specReplicasPath" protobuf:"bytes,1,name=specReplicasPath"`
	// StatusReplicasPath defines the JSON path inside of a CustomResource that corresponds to Scale.Status.Replicas.
	// Only JSON paths without the array notation are allowed.
	// Must be a JSON Path under .status.
	// If there is no value under the given path in the CustomResource, the status replica value in the /scale subresource
	// will default to 0.
	StatusReplicasPath string `json:"statusReplicasPath" protobuf:"bytes,2,opt,name=statusReplicasPath"`
	// LabelSelectorPath defines the JSON path inside of a CustomResource that corresponds to Scale.Status.Selector.
	// Only JSON paths without the array notation are allowed.
	// Must be a JSON Path under .status.
	// Must be set to work with HPA.
	// If there is no value under the given path in the CustomResource, the status label selector value in the /scale
	// subresource will default to the empty string.
	// +optional
	LabelSelectorPath *string `json:"labelSelectorPath,omitempty" protobuf:"bytes,3,opt,name=labelSelectorPath"`
}
