package main

import (
  "fmt"
  "net"
  "strings"
  "os"
)

func main() {
  // localMacAddr, err := net.()
  // if err != nil{
  //   panic(err)
  // }
  // fmt.Println("Local MAC addr:",localMacAddr)
  //
  //

  var currentIP, currentNetworkHardwareName string

  currentIP = "134.197.41.183/22"

  interfaces, _ := net.Interfaces()
         for _, interf := range interfaces {
                 if addrs, err := interf.Addrs(); err == nil {
                         for index, addr := range addrs {
                                if addr.String() != "127.0.0.1/8" {
                                  log.Println("[", index, "]", interf.Name, ">", addr)

                                    // only interested in the name with current IP address
                                    if strings.Contains(addr.String(), currentIP) {
                                            log.Println("Use name : ", interf.Name)
                                            currentNetworkHardwareName = interf.Name
                                    }
                                }
                         }
                 }
         }

         log.Println("-------------------------------------------")

         // extract the hardware information base on the interface name
         // capture above
         netInterface, err := net.InterfaceByName(currentNetworkHardwareName)

         if err != nil {
                 fmt.Println(err)
         }

         name := netInterface.Name
         macAddress := netInterface.HardwareAddr

         log.Println("Hardware name : ", name)
         log.Println("MAC address : ", macAddress)

         // verify if the MAC address can be parsed properly
         hwAddr, err := net.ParseMAC(macAddress.String())
         if err != nil {
                 log.Println("No able to parse MAC address : ", err)
                 os.Exit(-1)
         }
         log.Println("Physical hardware address : %s \n", hwAddr.String())

}



// net.Interfaces() // returns an array of interfaces
// net.InterfaceByName(oneOfTheReturnedInterfaces)
// ^.HardwareAddr