// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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 v1alpha1

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

// FetcherSpec defines the desired state of Fetcher
type FetcherSpec struct {
	// Fetcher is the type of how to fetch metrics from target.
	// +kubebuilder:validation:Required
	Type []FetcherType `json:"type,omitempty"`
	// OAPServerAddress is the address of backend OAPServers
	// +kubebuilder:validation:Required
	OAPServerAddress string `json:"OAPServerAddress,omitempty"`
	// ClusterName
	// +kubebuilder:validation:Optional
	ClusterName string `json:"clusterName,omitempty"`
}

// FetcherType Type string describes ingress methods for a service
type FetcherType string

const (
	FetcherTypePrometheus = "prometheus"
)

func (f *FetcherSpec) GetType() []string {
	result := make([]string, len(f.Type))
	for _, t := range f.Type {
		result = append(result, string(t))
	}
	return result
}

// FetcherStatus defines the observed state of Fetcher
type FetcherStatus struct {
	// Replicas is currently not being set and might be removed in the next version.
	// +kubebuilder:validation:Optional
	Replicas int32 `json:"replicas,omitempty"`
	// Represents the latest available observations of a fetcher's current state.
	// +kubebuilder:validation:Optional
	Conditions []FetcherCondition `json:"conditions,omitempty"`
}

type FetcherConditionType string

var (
	FetcherConditionTypeRead FetcherConditionType = "Ready"
)

// FetcherCondition describes the state of a deployment at a certain point.
type FetcherCondition struct {
	// Type of deployment condition.
	Type FetcherConditionType `json:"type" protobuf:"bytes,1,opt,name=type,casttype=DeploymentConditionType"`
	// Status of the condition, one of True, False, Unknown.
	Status v1.ConditionStatus `json:"status" protobuf:"bytes,2,opt,name=status,casttype=k8s.io/api/core/v1.ConditionStatus"`
	// The last time this condition was updated.
	LastUpdateTime metav1.Time `json:"lastUpdateTime,omitempty" protobuf:"bytes,6,opt,name=lastUpdateTime"`
	// Last time the condition transitioned from one status to another.
	LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" protobuf:"bytes,7,opt,name=lastTransitionTime"`
	// A human readable message indicating details about the transition.
	Message string `json:"message,omitempty" protobuf:"bytes,5,opt,name=message"`
}

// +kubebuilder:object:root=true
// +kubebuilder:subresource:status

// Fetcher is the Schema for the fetchers API
type Fetcher struct {
	metav1.TypeMeta   `json:",inline"`
	metav1.ObjectMeta `json:"metadata,omitempty"`

	Spec   FetcherSpec   `json:"spec,omitempty"`
	Status FetcherStatus `json:"status,omitempty"`
}

// +kubebuilder:object:root=true

// FetcherList contains a list of Fetcher
type FetcherList struct {
	metav1.TypeMeta `json:",inline"`
	metav1.ListMeta `json:"metadata,omitempty"`
	Items           []Fetcher `json:"items"`
}

func init() {
	SchemeBuilder.Register(&Fetcher{}, &FetcherList{})
}