package metrics

import (
	"sync"
)

type ServerMetrics interface {
	NewClient()
	CloseClient()
	NewProxy(name string, proxyType string, user string, clientID string)
	CloseProxy(name string, proxyType string)
	OpenConnection(name string, proxyType string)
	CloseConnection(name string, proxyType string)
	AddTrafficIn(name string, proxyType string, trafficBytes int64)
	AddTrafficOut(name string, proxyType string, trafficBytes int64)
}

var Server ServerMetrics = noopServerMetrics{}

var registerMetrics sync.Once

func Register(m ServerMetrics) {
	registerMetrics.Do(func() {
		Server = m
	})
}

type noopServerMetrics struct{}

func (noopServerMetrics) NewClient()                              {}
func (noopServerMetrics) CloseClient()                            {}
func (noopServerMetrics) NewProxy(string, string, string, string) {}
func (noopServerMetrics) CloseProxy(string, string)               {}
func (noopServerMetrics) OpenConnection(string, string)           {}
func (noopServerMetrics) CloseConnection(string, string)          {}
func (noopServerMetrics) AddTrafficIn(string, string, int64)      {}
func (noopServerMetrics) AddTrafficOut(string, string, int64)     {}