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* herein belong to their respective companies.
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* This software and all information contained therein is confidential
* and proprietary and shall not be duplicated, used, disclosed or
* disseminated in any way except as authorized by the applicable
* license agreement, without the express written permission of Broadcom.
* All authorized reproductions must be marked with this language.
*
* EXCEPT AS SET FORTH IN THE APPLICABLE LICENSE AGREEMENT, TO THE
* EXTENT PERMITTED BY APPLICABLE LAW OR AS AGREED BY BROADCOM IN ITS
* APPLICABLE LICENSE AGREEMENT, BROADCOM PROVIDES THIS DOCUMENTATION
* "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING WITHOUT LIMITATION,
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* AI assistance has been used to generate some or all contents of this file. That includes, but is not limited to, new code, modifying existing code, stylistic edits.
 */

package main

import (
	"context"
	"crypto/tls"
	"flag"
	"os"
	"os/signal"
	"strings"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	// to ensure that exec-entrypoint and run can make use of them.

	routev1 "github.com/openshift/api/route/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"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	"sigs.k8s.io/controller-runtime/pkg/metrics/filters"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
	"sigs.k8s.io/controller-runtime/pkg/webhook"

	securityv1 "github.com/caapim/layer7-operator/api/v1"
	securityv1alpha1 "github.com/caapim/layer7-operator/api/v1alpha1"
	"github.com/caapim/layer7-operator/internal/controller/api"
	"github.com/caapim/layer7-operator/internal/controller/gateway"
	"github.com/caapim/layer7-operator/internal/controller/portal"
	"github.com/caapim/layer7-operator/internal/controller/repository"
	controller "github.com/caapim/layer7-operator/internal/controller/statestore"
	"github.com/caapim/layer7-operator/internal/platform"
	"github.com/caapim/layer7-operator/pkg/util"
	//+kubebuilder:scaffold:imports
)

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

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

	utilruntime.Must(routev1.AddToScheme(scheme))
	utilruntime.Must(securityv1.AddToScheme(scheme))
	utilruntime.Must(securityv1alpha1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	var metricsAddr string
	var secureMetrics bool
	var enableLeaderElection bool
	var probeAddr string
	var enableHTTP2 bool
	var tlsOpts []func(*tls.Config)
	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
	flag.BoolVar(&secureMetrics, "metrics-secure", true,
		"If set, the metrics endpoint is served securely via HTTPS. Use --metrics-secure=false to use HTTP instead.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", true,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	opts := zap.Options{
		Development: false,
	}
	flag.BoolVar(&enableHTTP2, "enable-http2", false,
		"If set, HTTP/2 will be enabled for the metrics and webhook servers")
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

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

	disableHTTP2 := func(c *tls.Config) {
		setupLog.Info("disabling http/2")
		c.NextProtos = []string{"http/1.1"}
	}

	if !enableHTTP2 {
		tlsOpts = append(tlsOpts, disableHTTP2)
	}

	metricsServerOptions := metricsserver.Options{
		BindAddress:   metricsAddr,
		SecureServing: secureMetrics,
		TLSOpts:       tlsOpts,
	}

	if secureMetrics {
		metricsServerOptions.FilterProvider = filters.WithAuthenticationAndAuthorization
	}

	namespace, err := util.GetWatchNamespace()
	if err != nil {
		setupLog.Error(err, "failed to get watch namespace")
		os.Exit(1)
	}

	oNamespace, err := util.GetOperatorNamespace()
	if err != nil {
		setupLog.Error(err, "failed to get operator namespace")
		os.Exit(1)
	}

	webhookenabled, err := util.GetWebhookEnabled()

	if err != nil {
		setupLog.Error(err, "failed to determine if webhook should be enabled")
	}

	otelEnabled, err := util.GetOtelEnabled()

	if err != nil {
		setupLog.Error(err, "failed to determine if Otel should be enabled")
	}

	// Always configure webhook server to avoid errors, but only register webhooks if enabled
	webhookServer := webhook.NewServer(webhook.Options{
		Port: 9443,
	})

	options := ctrl.Options{
		Scheme:                  scheme,
		Metrics:                 metricsServerOptions,
		WebhookServer:           webhookServer,
		HealthProbeBindAddress:  probeAddr,
		LeaderElection:          enableLeaderElection,
		LeaderElectionNamespace: oNamespace,
		LeaderElectionID:        "d464e6a2.brcmlabs.com",
	}

	// Add support for MultiNamespace set in WATCH_NAMESPACE
	if len(namespace) > 0 {
		namespaces := make(map[string]cache.Config)
		for _, ns := range append(strings.Split(namespace, ","), oNamespace) {
			namespaces[ns] = cache.Config{}
		}
		options.Cache.DefaultNamespaces = namespaces
	}

	restConfig := ctrl.GetConfigOrDie()

	platform, err := platform.Detect(*restConfig)
	if err != nil {
		setupLog.Error(err, "unable to determine platform")
		os.Exit(1)
	}

	setupLog.Info("platform detected", "type", platform)

	mgr, err := ctrl.NewManager(restConfig, options)
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	if err = (&gateway.GatewayReconciler{
		Client:   mgr.GetClient(),
		Log:      ctrl.Log.WithName("controllers").WithName("Gateway"),
		Scheme:   mgr.GetScheme(),
		Platform: string(platform),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Gateway")
		os.Exit(1)
	}

	if err = (&repository.RepositoryReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("Repository"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Repository")
		os.Exit(1)
	}
	if err = (&portal.L7PortalReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("Portal"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "L7Portal")
		os.Exit(1)
	}
	if err = (&api.L7ApiReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("L7Api"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "L7Api")
		os.Exit(1)
	}

	if err = (&controller.L7StateStoreReconciler{
		Client:   mgr.GetClient(),
		Log:      ctrl.Log.WithName("controllers").WithName("L7StateStore"),
		Recorder: mgr.GetEventRecorderFor("L7StateStore"),
		Scheme:   mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "L7StateStore")
		os.Exit(1)
	}

	if webhookenabled {
		if err = (&securityv1.Gateway{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "Gateway")
			os.Exit(1)
		}
		if err = (&securityv1.Repository{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "Repository")
			os.Exit(1)
		}
	}

	if otelEnabled {
		collectorUrl, err := util.GetOtelCollectorUrl()
		if err != nil {
			setupLog.Error(err, "unable to retrieve otel collector url")
			os.Exit(1)
		}

		ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
		defer cancel()

		meterShutdown, err := util.InitOTelProvider(collectorUrl, ctx)
		if err != nil {
			setupLog.Error(err, "error in starting otel context")
		}
		defer func() {
			if err := meterShutdown(ctx); err != nil {
				setupLog.Error(err, "failed to shutdown otel provider")
			}
		}()

	}

	//+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)
	}
}