// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause

// Package kubeapi contains Kubernetes API types for internal consumption.
// These types are split into a separate package for consumption of
// non-Kubernetes shared libraries and binaries. Be mindful of not increasing
// dependency size for those consumers when adding anything new here.
package kubeapi

import (
	"time"
)

// Note: The API types are copied from k8s.io/api{,machinery} to not introduce a
// module dependency on the Kubernetes API as it pulls in many more dependencies.

// TypeMeta describes an individual object in an API response or request with
// strings representing the type of the object and its API schema version.
// Structures that are versioned or persisted should inline TypeMeta.
type TypeMeta struct {
	// Kind is a string value representing the REST resource this object represents.
	// Servers may infer this from the endpoint the client submits requests to.
	// Cannot be updated.
	// In CamelCase.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
	// +optional
	Kind string `json:"kind,omitempty"`

	// APIVersion defines the versioned schema of this representation of an object.
	// Servers should convert recognized schemas to the latest internal value, and
	// may reject unrecognized values.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
	// +optional
	APIVersion string `json:"apiVersion,omitempty"`
}

// ObjectMeta is metadata that all persisted resources must have, which
// includes all objects users must create.
type ObjectMeta struct {
	// Name must be unique within a namespace. Is required when creating resources, although
	// some resources may allow a client to request the generation of an appropriate name
	// automatically. Name is primarily intended for creation idempotence and configuration
	// definition.
	// Cannot be updated.
	// More info: http://kubernetes.io/docs/user-guide/identifiers#names
	// +optional
	Name string `json:"name"`

	// Namespace defines the space within which each name must be unique. An empty namespace is
	// equivalent to the "default" namespace, but "default" is the canonical representation.
	// Not all objects are required to be scoped to a namespace - the value of this field for
	// those objects will be empty.
	//
	// Must be a DNS_LABEL.
	// Cannot be updated.
	// More info: http://kubernetes.io/docs/user-guide/namespaces
	// +optional
	Namespace string `json:"namespace"`

	// UID is the unique in time and space value for this object. It is typically generated by
	// the server on successful creation of a resource and is not allowed to change on PUT
	// operations.
	//
	// Populated by the system.
	// Read-only.
	// More info: http://kubernetes.io/docs/user-guide/identifiers#uids
	// +optional
	UID string `json:"uid,omitempty"`

	// An opaque value that represents the internal version of this object that can
	// be used by clients to determine when objects have changed. May be used for optimistic
	// concurrency, change detection, and the watch operation on a resource or set of resources.
	// Clients must treat these values as opaque and passed unmodified back to the server.
	// They may only be valid for a particular resource or set of resources.
	//
	// Populated by the system.
	// Read-only.
	// Value must be treated as opaque by clients and .
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#concurrency-control-and-consistency
	// +optional
	ResourceVersion string `json:"resourceVersion,omitempty"`

	// A sequence number representing a specific generation of the desired state.
	// Populated by the system. Read-only.
	// +optional
	Generation int64 `json:"generation,omitempty"`

	// CreationTimestamp is a timestamp representing the server time when this object was
	// created. It is not guaranteed to be set in happens-before order across separate operations.
	// Clients may not set this value. It is represented in RFC3339 form and is in UTC.
	//
	// Populated by the system.
	// Read-only.
	// Null for lists.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
	// +optional
	CreationTimestamp time.Time `json:"creationTimestamp,omitempty"`

	// DeletionTimestamp is RFC 3339 date and time at which this resource will be deleted. This
	// field is set by the server when a graceful deletion is requested by the user, and is not
	// directly settable by a client. The resource is expected to be deleted (no longer visible
	// from resource lists, and not reachable by name) after the time in this field, once the
	// finalizers list is empty. As long as the finalizers list contains items, deletion is blocked.
	// Once the deletionTimestamp is set, this value may not be unset or be set further into the
	// future, although it may be shortened or the resource may be deleted prior to this time.
	// For example, a user may request that a pod is deleted in 30 seconds. The Kubelet will react
	// by sending a graceful termination signal to the containers in the pod. After that 30 seconds,
	// the Kubelet will send a hard termination signal (SIGKILL) to the container and after cleanup,
	// remove the pod from the API. In the presence of network partitions, this object may still
	// exist after this timestamp, until an administrator or automated process can determine the
	// resource is fully terminated.
	// If not set, graceful deletion of the object has not been requested.
	//
	// Populated by the system when a graceful deletion is requested.
	// Read-only.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
	// +optional
	DeletionTimestamp *time.Time `json:"deletionTimestamp,omitempty"`

	// Number of seconds allowed for this object to gracefully terminate before
	// it will be removed from the system. Only set when deletionTimestamp is also set.
	// May only be shortened.
	// Read-only.
	// +optional
	DeletionGracePeriodSeconds *int64 `json:"deletionGracePeriodSeconds,omitempty"`

	// Map of string keys and values that can be used to organize and categorize
	// (scope and select) objects. May match selectors of replication controllers
	// and services.
	// More info: http://kubernetes.io/docs/user-guide/labels
	// +optional
	Labels map[string]string `json:"labels,omitempty"`

	// Annotations is an unstructured key value map stored with a resource that may be
	// set by external tools to store and retrieve arbitrary metadata. They are not
	// queryable and should be preserved when modifying objects.
	// More info: http://kubernetes.io/docs/user-guide/annotations
	// +optional
	Annotations map[string]string `json:"annotations,omitempty"`
}

// Secret holds secret data of a certain type. The total bytes of the values
// in the Data field must be less than MaxSecretSize bytes.
type Secret struct {
	TypeMeta   `json:",inline"`
	ObjectMeta `json:"metadata"`

	// Data contains the secret data. Each key must consist of alphanumeric
	// characters, '-', '_' or '.'. The serialized form of the secret data is a
	// base64 encoded string, representing the arbitrary (possibly non-string)
	// data value here. Described in https://tools.ietf.org/html/rfc4648#section-4
	// +optional
	Data map[string][]byte `json:"data,omitempty"`
}

// SecretList is a list of Secret objects.
type SecretList struct {
	TypeMeta   `json:",inline"`
	ObjectMeta `json:"metadata"`

	Items []Secret `json:"items,omitempty"`
}

// Event contains a subset of fields from corev1.Event.
// https://github.com/kubernetes/api/blob/6cc44b8953ae704d6d9ec2adf32e7ae19199ea9f/core/v1/types.go#L7034
// It is copied here to avoid having to import kube libraries.
type Event struct {
	TypeMeta   `json:",inline"`
	ObjectMeta `json:"metadata"`
	Message    string      `json:"message,omitempty"`
	Reason     string      `json:"reason,omitempty"`
	Source     EventSource `json:"source,omitempty"` // who is emitting this Event
	Type       string      `json:"type,omitempty"`   // Normal or Warning
	// InvolvedObject is the subject of the Event. `kubectl describe` will, for most object types, display any
	// currently present cluster Events matching the object (but you probably want to set UID for this to work).
	InvolvedObject ObjectReference `json:"involvedObject"`
	Count          int32           `json:"count,omitempty"` // how many times Event was observed
	FirstTimestamp time.Time       `json:"firstTimestamp,omitempty"`
	LastTimestamp  time.Time       `json:"lastTimestamp,omitempty"`
}

// EventSource includes a subset of fields from corev1.EventSource.
// https://github.com/kubernetes/api/blob/6cc44b8953ae704d6d9ec2adf32e7ae19199ea9f/core/v1/types.go#L7007
// It is copied here to avoid having to import kube libraries.
type EventSource struct {
	// Component is the name of the component that is emitting the Event.
	Component string `json:"component,omitempty"`
}

// ObjectReference contains a subset of fields from corev1.ObjectReference.
// https://github.com/kubernetes/api/blob/6cc44b8953ae704d6d9ec2adf32e7ae19199ea9f/core/v1/types.go#L6902
// It is copied here to avoid having to import kube libraries.
type ObjectReference struct {
	// Kind of the referent.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
	// +optional
	Kind string `json:"kind,omitempty"`
	// Namespace of the referent.
	// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/
	// +optional
	Namespace string `json:"namespace,omitempty"`
	// Name of the referent.
	// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
	// +optional
	Name string `json:"name,omitempty"`
	// UID of the referent.
	// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#uids
	// +optional
	UID string `json:"uid,omitempty"`
	// API version of the referent.
	// +optional
	APIVersion string `json:"apiVersion,omitempty"`
}

// Status is a return value for calls that don't return other objects.
type Status struct {
	TypeMeta `json:",inline"`
	// Status of the operation.
	// One of: "Success" or "Failure".
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
	// +optional
	Status string `json:"status,omitempty"`

	// A human-readable description of the status of this operation.
	// +optional
	Message string `json:"message,omitempty"`

	// A machine-readable description of why this operation is in the
	// "Failure" status. If this value is empty there
	// is no information available. A Reason clarifies an HTTP status
	// code but does not override it.
	// +optional
	Reason string `json:"reason,omitempty"`

	// Extended data associated with the reason.  Each reason may define its
	// own extended details. This field is optional and the data returned
	// is not guaranteed to conform to any schema except that defined by
	// the reason type.
	// +optional
	Details *struct {
		Name string `json:"name,omitempty"`
		Kind string `json:"kind,omitempty"`
	} `json:"details,omitempty"`

	// Suggested HTTP return code for this status, 0 if not set.
	// +optional
	Code int `json:"code,omitempty"`
}

func (s Status) Error() string {
	return s.Message
}
