package collectors

import (
	"context"

	"github.com/go-logr/logr"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/tidbcloud/infra-provider/regional-server/api/v1alpha1"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/common/utils"
	"sigs.k8s.io/controller-runtime/pkg/client"
)

var (
	internetInfo = prometheus.NewDesc(
		"regional_server_internet_info",
		"Information about internet CR.",
		[]string{
			"name",
			"tenant_id",
			"project_id",
			"region",
			"provider",
			"vpc",
			"status",
		}, nil)
)

type internet struct {
	cli client.Client
	log logr.Logger
}

var _ prometheus.Collector = &internet{}

func (a *internet) Describe(ch chan<- *prometheus.Desc) {
	ch <- internetInfo
}

func (a *internet) Collect(ch chan<- prometheus.Metric) {
	internetList := &v1alpha1.InternetList{}
	err := a.cli.List(context.Background(), internetList)
	if err != nil {
		a.log.Error(err, "fetching internets")
		return
	}
	for _, internetCR := range internetList.Items {
		var vpc string
		if internetCR.Spec.VPCRef != nil {
			vpc = internetCR.Spec.VPCRef.Name
		}

		var tenant, project string
		tenants, projects := utils.GetRelatedTenantProjects(internetCR.GetLabels())
		if len(tenants) == 1 && len(projects) == 1 {
			tenant = tenants[0]
			project = projects[0]
		}

		ch <- prometheus.MustNewConstMetric(
			internetInfo,
			prometheus.GaugeValue,
			1.0,
			internetCR.Name,
			tenant,
			project,
			internetCR.Spec.Region,
			internetCR.Spec.Provider,
			vpc,
			string(internetCR.Status.Phase),
		)
	}
}