/*
Copyright (c) 2021 [email protected]
OpenGauss Operator is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:
         http://license.coscl.org.cn/MulanPSL2
THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details.
*/

package main

import (
	"flag"
	"os"
	"strconv"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	// to ensure that exec-entrypoint and run can make use of them.
	_ "k8s.io/client-go/plugin/pkg/client/auth"

	"k8s.io/apimachinery/pkg/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	opengaussv1 "opengauss-operator/api/v1"
	"opengauss-operator/controllers"
	"opengauss-operator/utils"
	// +kubebuilder:scaffold:imports
)

const (
	LEADER_KEY = "9e66c0cd.sig"
)

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

func init() {
	_ = clientgoscheme.AddToScheme(scheme)

	_ = opengaussv1.AddToScheme(scheme)
	// +kubebuilder:scaffold:scheme
}

func main() {
	var metricsAddr string
	var concurrentReconcile string
	var enableLeaderElection bool
	var watchNamespaces string
	var excludeNamespaces string
	var pollingPeriod string
	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
	flag.StringVar(&concurrentReconcile, "max-concurrent-reconcile", "5", "The max concurrent reconcile count.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	flag.StringVar(&watchNamespaces, "watch-namespaces", "", "The namespaces that will be managed by current operator.")
	flag.StringVar(&excludeNamespaces, "exclude-namespaces", "", "The namespaces that will not be managed by current operator.")
	flag.StringVar(&pollingPeriod, "pollingPeriod", "", "The Period of reconcile polling, that is global setting.")
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseDevMode(true)))

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:             scheme,
		MetricsBindAddress: metricsAddr,
		Port:               9443,
		LeaderElection:     enableLeaderElection,
		LeaderElectionID:   getLeaderElectionID(watchNamespaces),
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	if enableLeaderElection {
		os.Unsetenv(utils.ENV_TOTAL_KEY)
	}
	concurrent, _ := strconv.Atoi(concurrentReconcile)
	reconcilePollingPeriod, _ := strconv.ParseInt(pollingPeriod, 10, 64)
	_, err = controllers.NewOpenGaussClusterReconciler(mgr, ctrl.Log.WithName("controllers").WithName("OpenGaussCluster"), concurrent,
		watchNamespaces, excludeNamespaces, reconcilePollingPeriod)

	if err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "OpenGaussCluster")
		os.Exit(1)
	}

	// +kubebuilder:scaffold:builder

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

func getLeaderElectionID(watchNamespaces string) string {
	leaderKeyPrefix := ""
	if watchNamespaces != "" {
		namespaces := utils.StringToSet(watchNamespaces)
		leaderKeyPrefix = namespaces.ToArray()[0] + "."
	}
	return leaderKeyPrefix + LEADER_KEY
}