// not implemented
package dns

import (
	"fmt"
	"os"
	"strings"
	"sync"

	"github.com/cert-manager/cert-manager/pkg/acme/webhook"
	acme "github.com/cert-manager/cert-manager/pkg/acme/webhook/apis/acme/v1alpha1"
	"github.com/miekg/dns"
	"k8s.io/client-go/rest"
	"k8s.io/klog/v2"
)

type SthomeSolver struct {
	name       string
	server     *dns.Server
	txtRecords map[string]string
	sync.RWMutex
}

func (e *SthomeSolver) Name() string {
	return e.name
}

func (e *SthomeSolver) Present(ch *acme.ChallengeRequest) error {
	e.Lock()
	e.txtRecords[ch.ResolvedFQDN] = ch.Key
	e.Unlock()
	cfg, err := LoadConfig(ch.Config)
	if err != nil {
		return err
	}
	klog.Infof("CZ: Presenting record for %s, type: %s, uid: %s, key: %s, ns: %s, fqdn: %s, zone: %s, allowambcred: %t, cfg.secret: %s, cfg.email: %s, cfg.allowz: %s",
		ch.DNSName,
		ch.UID,
		ch.Type,
		ch.Key,
		ch.ResourceNamespace,
		ch.ResolvedFQDN,
		ch.ResolvedZone,
		ch.AllowAmbientCredentials,
		cfg.APIKeySecretRef.Name,
		cfg.Email,
		strings.Join(cfg.AllowedZones, ","),
	)
	// TODO: convert shell script to golang
	localip := GetOutboundIP(Dnsserver_net)
	success, _ := Execute(
		Shell,
		AcmeAuthCmd,
		"set",
		ch.DNSName,
		ch.ResolvedFQDN,
		ch.Key,
		"-l",
		localip,
		"-v",
	)
	klog.Infof("Execute set TXT returned success: %t", success)
	return nil
}

func (e *SthomeSolver) CleanUp(ch *acme.ChallengeRequest) error {
	e.Lock()
	delete(e.txtRecords, ch.ResolvedFQDN)
	e.Unlock()
	localip := GetOutboundIP(Dnsserver_net)
	success, _ := Execute(
		Shell,
		AcmeAuthCmd,
		"unset",
		ch.DNSName,
		ch.ResolvedFQDN,
		ch.Key,
		"-l",
		localip,
		"-v",
	)
	klog.Infof("Execute unset TXT returned success: %t", success)
	return nil
}

func (e *SthomeSolver) Initialize(kubeClientConfig *rest.Config, stopCh <-chan struct{}) error {
	go func(done <-chan struct{}) {
		<-done
		if err := e.server.Shutdown(); err != nil {
			fmt.Fprintf(os.Stderr, "%s\n", err.Error())
		}
	}(stopCh)
	go func() {
		if err := e.server.ListenAndServe(); err != nil {
			fmt.Fprintf(os.Stderr, "%s\n", err.Error())
			os.Exit(1)
		}
	}()
	return nil
}

func New(port string) webhook.Solver {
	e := &SthomeSolver{
		name:       ProviderName,
		txtRecords: make(map[string]string),
	}
	e.server = &dns.Server{
		Addr:    ":" + port,
		Net:     "udp",
		Handler: dns.HandlerFunc(e.handleDNSRequest),
	}
	return e
}