package metrics

import (
	"fmt"
	"sync"
	"time"

	"github.com/go-ping/ping"
	"github.com/gravitl/netmaker/logger"
	"github.com/gravitl/netmaker/models"
)

// lock for metrics map
var metricsMapLock = &sync.RWMutex{}

// metrics data map
var metricsPeerMap = make(map[string]map[string]*models.ProxyMetric)

// GetMetricByServer - get metric data of peers by server
func GetMetricByServer(server string) map[string]*models.ProxyMetric {
	metricsMapLock.RLock()
	defer metricsMapLock.RUnlock()
	if _, ok := metricsPeerMap[server]; !ok {
		return nil
	}
	return metricsPeerMap[server]
}

// GetMetric - fetches the metric data for the peer
func GetMetric(server, peerKey string) models.ProxyMetric {
	metric := models.ProxyMetric{}
	peerMetricMap := GetMetricByServer(server)
	metricsMapLock.RLock()
	defer metricsMapLock.RUnlock()
	if peerMetricMap == nil {
		return metric
	}
	if m, ok := peerMetricMap[peerKey]; ok && m != nil {
		metric = *m
	}
	return metric
}

// UpdateMetric - updates metric data for the peer
func UpdateMetric(server, peerKey string, metric *models.ProxyMetric) {
	metricsMapLock.Lock()
	defer metricsMapLock.Unlock()
	if metricsPeerMap[server] == nil {
		metricsPeerMap[server] = make(map[string]*models.ProxyMetric)
	}
	metricsPeerMap[server][peerKey] = metric
}

// UpdateMetricByPeer - updates metrics data by peer public key
func UpdateMetricByPeer(peerKey string, metric *models.ProxyMetric, onlyTraffic bool) {
	metricsMapLock.Lock()
	defer metricsMapLock.Unlock()
	for server, peerKeyMap := range metricsPeerMap {
		if peerMetric, ok := peerKeyMap[peerKey]; ok {
			peerMetric.TrafficRecieved += metric.TrafficRecieved
			peerMetric.TrafficSent += metric.TrafficSent
			if !onlyTraffic {
				peerMetric.LastRecordedLatency = metric.LastRecordedLatency
			}

			metricsPeerMap[server][peerKey] = peerMetric
		}
	}
}

// ResetMetricsForPeer - reset metrics for peer
func ResetMetricsForPeer(server, peerKey string) {
	metricsMapLock.Lock()
	defer metricsMapLock.Unlock()
	delete(metricsPeerMap[server], peerKey)
}

// ResetMetricForNode - resets node level metrics
func ResetMetricForNode(server, peerKey, peerID string) {
	metric := GetMetric(server, peerKey)
	delete(metric.NodeConnectionStatus, peerID)
	UpdateMetric(server, peerKey, &metric)
}

const MetricCollectionInterval = time.Second * 25

// PeerConnectionStatus - get peer connection status by pinging
func PeerConnectionStatus(address string) (connected bool) {
	fmt.Println("PINGER ADDR: ", address)
	pinger, err := ping.NewPinger(address)
	if err != nil {
		logger.Log(0, "could not initiliaze ping peer address", address, err.Error())
		connected = false
	} else {
		pinger.Timeout = time.Second * 2
		err = pinger.Run()
		if err != nil {
			logger.Log(0, "failed to ping on peer address", address, err.Error())
			return false
		} else {
			pingStats := pinger.Statistics()
			if pingStats.PacketsRecv > 0 {
				connected = true
				return
			}
		}
	}

	return
}