// This creates a simple hello world window
package main

import 	(
	"net"
	"strings"
	// "git.wit.org/wit/gui"
)

var DEBUGNET bool = false

// this doesn't work
/*
func watchNetworkInterfaces() {
	// Get list of network interfaces
	interfaces, _ := net.Interfaces()

	// Set up a notification channel
	notification := make(chan net.Interface)

	log(DEBUGNET, "watchNet()")
	// Start goroutine to watch for changes
	go func() {
		log(DEBUGNET, "watchNet() func")
		for {
			log(DEBUGNET, "forever loop start")
			// Check for changes in each interface
			for _, i := range interfaces {
				log(DEBUGNET, "something on i =", i)
				if status := i.Flags & net.FlagUp; status != 0 {
					notification <- i
					log(DEBUGNET, "something on i =", i)
				}
			}
			log(DEBUGNET, "forever loop end")
		}
	}()
}
*/

func IsIPv6(address string) bool {
	return strings.Count(address, ":") >= 2
}

func IsReal(ip *net.IP) bool {
	if (ip.IsPrivate() || ip.IsLoopback() || ip.IsLinkLocalUnicast()) {
		log(DEBUGNET, "\t\tIP is Real = false")
		return false
	} else {
		log(DEBUGNET, "\t\tIP is Real = true")
		return true
	}
}

func checkInterface(i *net.Interface) {
	val, ok := me.ifmap[i.Index]
	if ! ok {
		log(i.Name, "is a new network interface. The linux kernel index =", i.Index)
		me.ifmap[i.Index] = i
		me.ipchange = true
		return
	}
	log(args.VerboseNet, "me.ifmap[i] does exist. Need to compare everything.", me.ifmap[i.Index].Name)
	if (me.ifmap[i.Index].Name != val.Name) {
		log(val.Name, "has changed to it's name to", i.Name)
		me.ifmap[i.Index] = i
		me.ipchange = true
		return
	}
}

func isNewIPNet(ip *net.IPNet, i *net.Interface) bool {
	log(args.VerboseNet, "\t\taddr.(type) = *net.IPNet")
	log(args.VerboseNet, "\t\taddr.(type) =", ip)
	var realip string
	realip = ip.IP.String()

	val, ok := me.ip[realip]
	if ok {
		log(args.VerboseNet, val.IPNet.IP, "is already a defined IP address")
		return false
	}

	me.ip[realip] = new(IPtype)
	me.ip[realip].IPNet = ip
	t := "IPv4"
	if (IsIPv6(ip.String())) {
		me.ip[realip].IPv6 = true
		me.ip[realip].IPv4 = false
		t = "IPv6"
	} else {
		me.ip[realip].IPv6 = false
		me.ip[realip].IPv4 = true
	}
	if (IsReal(&ip.IP)) {
		log("\tIP is Real    ", t, i.Index, i.Name, realip)
	} else {
		log("\tIP is not Real", t, i.Index, i.Name, realip)
	}
	log(args.VerboseNet, "\t\tIP is IsPrivate() =", ip.IP.IsPrivate())
	log(args.VerboseNet, "\t\tIP is IsLoopback() =", ip.IP.IsLoopback())
	log(args.VerboseNet, "\t\tIP is IsLinkLocalUnicast() =", ip.IP.IsLinkLocalUnicast())
	return true
}

func scanInterfaces() {
	me.ipchange = false
	ifaces, _ := net.Interfaces()
	// me.ifnew = ifaces
	log(DEBUGNET, SPEW, ifaces)
	for _, i := range ifaces {
		addrs, _ := i.Addrs()
		// log("range ifaces = ", i)
		checkInterface(&i)
		log(args.VerboseNet, "*net.Interface.Name = ", i.Name, i.Index)
		log(args.VerboseNet, SPEW, i)
		log(DEBUGNET, SPEW, addrs)
		for _, addr := range addrs {
			log(DEBUGNET, "\taddr =", addr)
			log(DEBUGNET, SPEW, addrs)
			ips, _ := net.LookupIP(addr.String())
			log(DEBUGNET, "\tLookupIP(addr) =", ips)
			switch v := addr.(type) {
			case *net.IPNet:
				isNewIPNet(v, &i)
				// log("\t\tIP is () =", ip.())
			default:
				log(DEBUGNET, "\t\taddr.(type) = NO IDEA WHAT TO DO HERE v =", v)
			}
		}
	}
}