package net

import "net"
import "git.loafle.net/overflow/overflow_discovery/net/model"

func ScanZone(endChan chan<- bool, zoneChan chan<- *model.DiscoveryZone, logChan chan<- error) {
	var err error
	var ifaces []net.Interface
	var addrs []net.Addr
	var ipnet *net.IPNet
	var zones []*net.IPNet

	if ifaces, err = net.Interfaces(); nil != err {
		logChan <- err
		return
	}

	zones = make([]*net.IPNet, 0)

	for _, i := range ifaces {

		if addrs, err = i.Addrs(); nil != err {
			logChan <- err
			continue
		}

		for _, addr := range addrs {
			// log.Printf("addr: %s", addr.String())
			if _, ipnet, err = net.ParseCIDR(addr.String()); nil != err {
				logChan <- err
				continue
			}
			if ipnet.IP.IsLoopback() || checkSameZone(zones, ipnet) {
				continue
			}

			// log.Printf("zone: %s", ipnet.String())
			zones = append(zones, ipnet)

			dz := &model.DiscoveryZone{
				Iface: i.Name,
				Mac:   i.HardwareAddr.String(),
				IP:    ipnet.IP.String(),
			}

			zoneChan <- dz
		}
	}

	endChan <- true

}

func checkSameZone(zones []*net.IPNet, ipnet *net.IPNet) bool {
	for _, i := range zones {
		if i.Contains(ipnet.IP) {
			return true
		}
	}
	return false
}