package scan

import (
	"context"
	"fmt"

	"log"

	"github.com/Ullaakut/nmap/v3"
	ipnet "github.com/korylprince/ipnetgen"
)

func Pcidr(cidr_addres string, get_ip int) {

	scanner, err := nmap.NewScanner(
		context.Background(),
		nmap.WithTargets(cidr_addres),
		nmap.WithPingScan(),
	)
	if err != nil {
		log.Fatalf("unable to create nmap scanner: %v", err)
	}

	result, warnings, err := scanner.Run()
	if len(*warnings) > 0 {
		log.Printf("run finished with warnings: %s\n", *warnings) // Warnings are non-critical errors from nmap.
	}
	if err != nil {
		log.Fatalf("nmap scan failed: %v", err)
	}

	var slices []string
	for _, host := range result.Hosts {
		slices = append(slices, host.Addresses[0].String())
	}

	var cird_ip_address []string
	gen, err := ipnet.New(cidr_addres)
	if err != nil {
		panic(err)
	}

	for ip := gen.Next(); ip != nil; ip = gen.Next() {
		cird_ip_address = append(cird_ip_address, ip.String())
	}

	// Delete the first and last IP in cird_ip_address as reserved addresses.
	cird_ip_address = cird_ip_address[1 : len(cird_ip_address)-1]

	// Clear the addresses occupied by scanning in cird_ip_address.
	for _, ip := range slices {
		for i, v := range cird_ip_address {
			if ip == v {
				cird_ip_address = append(cird_ip_address[:i], cird_ip_address[i+1:]...)
			}
		}
	}

	// getIP
	for i := 0; i < get_ip; i++ {
		fmt.Println(cird_ip_address[i])
	}
}