/*
example is a short example program showing the detailed result from a lookup.
*/
package main

import (
	"context"
	"fmt"
	"net"
	"os"

	"src.lwithers.me.uk/go/dnsxl"
)

var (
	xlist *dnsxl.XList
)

func main() {
	if len(os.Args) < 2 {
		fmt.Fprintln(os.Stderr, "Expecting one or more names/IPs to look up")
		os.Exit(1)
	}

	xlist = dnsxl.New(nil)
	xlist.AddServers("sbl.spamhaus.org", "xbl.spamhaus.org", "pbl.spamhaus.org")

	for i := 1; i < len(os.Args); i++ {
		lookup(os.Args[i])
	}
}

func lookup(name string) {
	fmt.Printf("==== %s ====\n", name)
	ips, err := net.DefaultResolver.LookupIP(context.Background(), "ip", name)
	switch {
	case err != nil:
		fmt.Printf("Failed to look up name: %v\n", err)
		return
	case len(ips) == 0:
		fmt.Println("No addresses found for name")
		return
	}

	for _, ip := range ips {
		fmt.Printf("--- %s\n", ip)
		res, err := xlist.LookupIP(ip)
		if err != nil {
			fmt.Printf("Failed to look up IP: %v\n", err)
			continue
		}
		for _, r := range res {
			switch {
			case r.Error != nil:
				fmt.Printf("%s\tError: %v\n", r.Server, r.Error)
			case r.InList:
				fmt.Printf("%s\tEntry in list (reason: %q)\n", r.Server, r.Reason)
			default:
				fmt.Printf("%s\tEntry not in list\n", r.Server)
			}
		}
	}
}