package exporters

import (
	"context"
	"encoding/xml"
	"log"
	"strings"

	"github.com/dnaeon/go-ucs/api"
	"github.com/dnaeon/go-ucs/mo"
	"github.com/prometheus/client_golang/prometheus"
)

type UcsmTemperaturesCollector struct {
	ucsClient *api.Client
	ctx       context.Context
	metrics   []*prometheus.Desc
}

var metrics []prometheus.Desc

//var ucsClient *api.Client
//var ctx context.Context

/*
	type ComputeMbTempStats struct {
		XMLName       xml.Name `xml:"computeMbTempStats"`
		Dn            string   `xml:"dn,attr,omitempty"`
		FmTempSenIo   string   `xml:"fmTempSenIo,attr,omitempty"`
		FmTempSenRear string   `xml:"fmTempSenRear,attr,omitempty"`
	}
*/
func NewUcsmTemperatureCollector(client *api.Client, ctx context.Context) *UcsmTemperaturesCollector {

	/*
		ucsClient = client
		ctx = ctx
	*/
	/*
		return &main.Collector{
			UcsmTemperature: prometheus.NewDesc("ucsm_temperature_sensor",
				"UCSM temperature sensor for motherboard/cpu/psu",
				[]string{"server", "component", "description"}, nil,
			),
		}
	*/

	return &UcsmTemperaturesCollector{
		ucsClient: client,
		ctx:       ctx,
		metrics: []*prometheus.Desc{
			prometheus.NewDesc(
				"ucsm_temperature_sensor",
				"UCSM temperature sensor for motherboard/cpu/psu",
				[]string{"server", "component", "description"}, nil,
			),
		},
	}

}

// Describe prometheus describe
func (u *UcsmTemperaturesCollector) Describe(ch chan<- *prometheus.Desc) {
	log.Printf("Running Describe for UcsmTemperaturesCollector\n")

	// Describe the metrics and send them on the channel
	for _, desc := range u.metrics {
		ch <- desc
	}

	/*
		metricDesc := prometheus.NewDesc("ucsm_temperature_sensor",
			"UCSM temperature sensor for motherboard/cpu/psu",
			[]string{"server", "component", "description"}, nil)

		fmt.Printf("metricDesc: %v\n", *metricDesc)

		metrics = append(metrics, *metricDesc)
		ch <- metricDesc
	*/
}

// Collect prometheus collect
func (u *UcsmTemperaturesCollector) Collect(ch chan<- prometheus.Metric) {
	// The type into which we unmarshal the result data
	type temps struct {
		XMLName      xml.Name
		Temperatures []mo.ComputeMbTempStats `xml:"computeMbTempStats"`
	}

	tempRequest := api.ConfigResolveClassRequest{
		Cookie:         u.ucsClient.Cookie,
		ClassId:        "computeMbTempStats",
		InHierarchical: "false",
	}

	var boardTempList temps

	log.Println("Retrieving managed objects with class `computeMbTempStats`")

	if err := u.ucsClient.ConfigResolveClass(u.ctx, tempRequest, &boardTempList); err != nil {
		log.Fatalf("Unable to retrieve `computeMbTempStats` managed object: %s", err)
	}

	log.Printf("Retrieved temps for %d compute blades\n", len(boardTempList.Temperatures))
	for _, temps := range boardTempList.Temperatures {
		// Substring the Dn for the temperatures to get the Dn for the parent blade itself
		bladeDn := strings.Replace(temps.Dn, "/board/temp-stats", "", -1)

		log.Printf("Temps for blade %s:\n", bladeDn)
		log.Printf("Front Temperature: %v\n", temps.FmTempSenIo)
		log.Printf("Rear Temperature: %v\n", temps.FmTempSenRear)

		// TODO - work out a better way of running this twice, once for each temperature sensor

		// Collect the actual metric values and send them on the channel
		for _, desc := range u.metrics {

			// populate the labels array
			//labelValues := []string{bladeDn, temps.Dn, "motherboard_rear_temperature"}

			// generate the metric
			metric1 := prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, temps.FmTempSenIo, bladeDn, temps.Dn, "motherboard_rear_temperature")
			// send the data
			ch <- metric1

			// generate the metric
			metric2 := prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, temps.FmTempSenRear, bladeDn, temps.Dn, "motherboard_front_temperature")
			// send the data
			ch <- metric2
		}

		//ch <- prometheus.MustNewConstMetric()
	}

}

/*
logger = logging.getLogger("UcsmTemperatureSensorCollector")

class UcsmTemperatureSensorCollector(BaseCollector):
    def get_metrics(self):
        return {
            "sensor": GaugeMetricFamily("ucsm_temperature_sensor",
                                        "UCSM temperature sensor for motherboard/cpu/psu",
                                        labels=['server', 'component',
                                                'description'])
        }

    def collect_metrics(self, server, handle):
        logger.debug("Collecting Metrics ")
        g = self.get_metrics()['sensor']

        mb_temp = handle.query_classid(NamingId.COMPUTE_MB_TEMP_STATS)
        for temp in mb_temp:
            value_rear = math.nan if temp.fm_temp_sen_rear == 'not-applicable' else temp.fm_temp_sen_rear
            g.add_metric(labels=[server, temp.dn, "motherboard_rear_temperature"],
                                    value=value_rear)
            value_io = math.nan if temp.fm_temp_sen_io == 'not-applicable' else temp.fm_temp_sen_io
            g.add_metric(labels=[server, temp.dn, "motherboard_front_temperature"],
                                    value=value_io)

        cpu_temp = handle.query_classid(NamingId.PROCESSOR_ENV_STATS)
        for temp in cpu_temp:
            g.add_metric(labels=[server, temp.dn, "cpu_temperature"],
                                    value=temp.temperature)

        psu_temp = handle.query_classid(NamingId.EQUIPMENT_PSU_STATS)
        for temp in psu_temp:
            g.add_metric(labels=[server, temp.dn, "psu_temperature"],
                                    value=temp.ambient_temp)
        yield g
*/