package main

import (
	"flag"
	"log"
	"os"

	"github.com/kelseyhightower/envconfig"
	"github.com/keptn/lifecycle-toolkit/keptn-cert-manager/controllers/keptnwebhookcontroller"
	corev1 "k8s.io/api/core/v1"
	apiv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/cache"
	ctrlclient "sigs.k8s.io/controller-runtime/pkg/client"
	"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"
	// nolint:gci
	// +kubebuilder:scaffold:imports
)

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

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(corev1.AddToScheme(scheme))
	utilruntime.Must(apiv1.AddToScheme(scheme))
	// +kubebuilder:scaffold:scheme
}

type envConfig struct {
	KeptnNamespace          string `envconfig:"NAMESPACE" default:"keptn-system"`
	KeptnLabelSelectorKey   string `envconfig:"LABEL_SELECTOR_KEY" default:"keptn.sh/inject-cert"`
	KeptnLabelSelectorValue string `envconfig:"LABEL_SELECTOR_VALUE" default:"true"`
}

func main() {
	var env envConfig
	if err := envconfig.Process("", &env); err != nil {
		log.Fatalf("Failed to process env var: %s", err)
	}
	var metricsAddr string
	var enableLeaderElection bool
	var probeAddr string
	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	opts := zap.Options{
		Development: true,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

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

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme: scheme,
		Cache: cache.Options{
			DefaultNamespaces: map[string]cache.Config{
				env.KeptnNamespace: {},
			},
		},
		Metrics: metricsserver.Options{
			BindAddress: metricsAddr,
		},
		WebhookServer: webhook.NewServer(webhook.Options{
			Port: 9443,
		}),
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "f9d59293.keptn.sh",
		// LeaderElectionReleaseOnCancel defines if the leader should step down voluntarily
		// when the Manager ends. This requires the binary to immediately end when the
		// Manager is stopped, otherwise, this setting is unsafe. Setting this significantly
		// speeds up voluntary leader transitions as the new leader don't have to wait
		// LeaseDuration time first.
		//
		// In the default scaffold provided, the program ends immediately after
		// the manager stops, so would be fine to enable this option. However,
		// if you are doing or is intended to do any operation such as perform cleanups
		// after the manager stops then its usage might be unsafe.
		// LeaderElectionReleaseOnCancel: true,
		Client: ctrlclient.Options{
			Cache: &ctrlclient.CacheOptions{
				DisableFor: []ctrlclient.Object{&apiv1.CustomResourceDefinition{}},
			},
		},
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}
	certificateReconciler := keptnwebhookcontroller.NewReconciler(keptnwebhookcontroller.CertificateReconcilerConfig{
		Client:        mgr.GetClient(),
		Scheme:        mgr.GetScheme(),
		CancelMgrFunc: nil,
		Log:           ctrl.Log.WithName("KeptnWebhookCert Controller"),
		Namespace:     env.KeptnNamespace,
		MatchLabels: map[string]string{
			env.KeptnLabelSelectorKey: env.KeptnLabelSelectorValue,
		},
	})
	if err = certificateReconciler.SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Deployment")
		os.Exit(1)
	}

	// +kubebuilder:scaffold:builder

	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up health check")
		os.Exit(1)
	}
	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up ready check")
		os.Exit(1)
	}

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