package service

import (
	"context"
	metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/client-go/kubernetes"
	k8scommon "pandax/apps/devops/services/k8s/common"
	"pandax/apps/devops/services/k8s/dataselect"
	"pandax/apps/devops/services/k8s/event"
	"pandax/apps/devops/services/k8s/pods"
)

// GetServicePods gets list of pods targeted by given label selector in given namespace.
func GetServicePods(client *kubernetes.Clientset, namespace, name string, dsQuery *dataselect.DataSelectQuery) (*pods.PodList, error) {
	podList := pods.PodList{
		Pods: []pods.Pod{},
	}

	service, err := client.CoreV1().Services(namespace).Get(context.TODO(), name, metaV1.GetOptions{})
	if err != nil {
		return &podList, err
	}

	if service.Spec.Selector == nil {
		return &podList, nil
	}

	labelSelector := labels.SelectorFromSet(service.Spec.Selector)
	channels := &k8scommon.ResourceChannels{
		PodList: k8scommon.GetPodListChannelWithOptions(client, k8scommon.NewSameNamespaceQuery(namespace),
			metaV1.ListOptions{
				LabelSelector: labelSelector.String(),
				FieldSelector: fields.Everything().String(),
			}, 1),
	}

	apiPodList := <-channels.PodList.List
	if err := <-channels.PodList.Error; err != nil {
		return &podList, err
	}

	events, err := event.GetPodsEvents(client, namespace, apiPodList.Items)

	if err != nil {
		return &podList, err
	}

	podList = pods.ToPodList(apiPodList.Items, events, dsQuery)
	return &podList, nil
}