package main

import (
	"crypto/tls"
	"flag"
	"os"

	_ "k8s.io/client-go/plugin/pkg/client/auth"

	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"

	metricsv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"

	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
	"sigs.k8s.io/controller-runtime/pkg/webhook"

	reaperv1alpha1 "github.com/jominjun94/k8s-cpu-limit-check-operator/api/v1alpha1"
	"github.com/jominjun94/k8s-cpu-limit-check-operator/internal/controller"
)

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
)

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(metricsv1beta1.AddToScheme(scheme)) // ⭐ 핵심
	utilruntime.Must(reaperv1alpha1.AddToScheme(scheme))
}

func main() {
	var metricsAddr string
	var probeAddr string

	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "Metrics address")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "Probe address")

	opts := zap.Options{Development: true}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

	disableHTTP2 := func(c *tls.Config) {
		c.NextProtos = []string{"http/1.1"}
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme: scheme,
		Metrics: metricsserver.Options{
			BindAddress: metricsAddr,
			TLSOpts:     []func(*tls.Config){disableHTTP2},
		},
		WebhookServer:          webhook.NewServer(webhook.Options{TLSOpts: []func(*tls.Config){disableHTTP2}}),
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         false,
		LeaderElectionID:       "cpu-reaper.lock",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	if err := (&controller.CpuReaperPolicyReconciler{
		Client: mgr.GetClient(),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller")
		os.Exit(1)
	}

	mgr.AddHealthzCheck("healthz", healthz.Ping)
	mgr.AddReadyzCheck("readyz", healthz.Ping)

	setupLog.Info("starting manager")
	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
		setupLog.Error(err, "manager exited")
		os.Exit(1)
	}
}