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/consts"
	"sigs.k8s.io/controller-runtime/pkg/client"
)

var (
	dataplaneInfo = prometheus.NewDesc(
		"dataplane_manager_dataplane_info",
		"Information about dataplane CR.",
		[]string{
			"name",
			"tenant_id",
			"status",
		}, nil)
)

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

var _ prometheus.Collector = &dataplane{}

func (d *dataplane) Describe(ch chan<- *prometheus.Desc) {
	ch <- dataplaneInfo
}

func (d *dataplane) Collect(ch chan<- prometheus.Metric) {
	dataplaneList := &v1alpha1.DataPlaneList{}
	if err := d.cli.List(context.Background(), dataplaneList); err != nil {
		d.log.Error(err, "fetching dataplaneList")
		return
	}
	for _, dpCR := range dataplaneList.Items {
		tenant := dpCR.GetLabels()[consts.TenantLabelKey]

		ch <- prometheus.MustNewConstMetric(
			dataplaneInfo,
			prometheus.GaugeValue,
			1,
			dpCR.Name,
			tenant,
			string(dpCR.Status.Phase),
		)
	}
}