// Command tenant-operator runs the Tenant CRD controller (see
// internal/controller/tenant_controller.go's doc comment for exactly
// what it does and doesn't manage). Same "cmd/<service>/main.go"
// convention as every other Go service in this repo
// (api/cmd/api, enterprise/cmd/enterprise-auth), rather than
// kubebuilder's newer default of a bare cmd/main.go.
package main

import (
	"flag"
	"os"

	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	"sigs.k8s.io/controller-runtime/pkg/metrics/server"

	cairnobsv1alpha1 "github.com/cairnobs/cairnobs/deploy/operator/api/v1alpha1"
	"github.com/cairnobs/cairnobs/deploy/operator/internal/controller"
)

var scheme = runtime.NewScheme()

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(cairnobsv1alpha1.AddToScheme(scheme))
}

func main() {
	var metricsAddr, probeAddr string
	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metrics endpoint binds to.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the health probe endpoint binds to.")
	opts := zap.Options{Development: false}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	logger := zap.New(zap.UseFlagOptions(&opts))
	ctrl.SetLogger(logger)

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 scheme,
		Metrics:                server.Options{BindAddress: metricsAddr},
		HealthProbeBindAddress: probeAddr,
		// A single tenant-operator replica reconciling cluster-wide state
		// is enough at this scope (see internal/controller's doc comment
		// on what it does and doesn't manage) -- leader election matters
		// once a second replica could double-generate a Secret, not
		// before.
		LeaderElection: false,
	})
	if err != nil {
		logger.Error(err, "unable to start manager")
		os.Exit(1)
	}

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

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

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