package worker

import (
	"context"
	"os"
	"sync"
	"time"

	"github.com/go-logr/logr"
	"github.com/go-logr/zapr"
	"github.com/pingcap/log"
	"github.com/tidbcloud/observability/pkg/common/constants"
	"github.com/tidbcloud/observability/pkg/common/structs"
	"github.com/tidbcloud/observability/pkg/common/utils"
	"github.com/tidbcloud/observability/pkg/resourceworker/controllers/cluster"
	"github.com/tidbcloud/observability/pkg/resourceworker/controllers/endpointservice"
	"github.com/tidbcloud/observability/pkg/resourceworker/controllers/iam"
	integrationtaskv2 "github.com/tidbcloud/observability/pkg/resourceworker/controllers/integrationtask/v2"
	"github.com/tidbcloud/observability/pkg/resourceworker/controllers/privateendpoints"
	"github.com/tidbcloud/observability/pkg/resourceworker/controllers/s3"
	"github.com/tidbcloud/observability/pkg/resourceworker/controllers/serverless"
	"github.com/tidbcloud/observability/pkg/resourceworker/gc"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	"sigs.k8s.io/controller-runtime/pkg/manager"

	vmv1 "github.com/VictoriaMetrics/operator/api/operator/v1beta1"
	prometheusv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
	prometheusv1alpha1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1alpha1"
	observabilitypingcapcomv1 "github.com/tidbcloud/observability/api/regionalserver/resourceworker/v1"
	myclient "github.com/tidbcloud/observability/pkg/mysql/client"
	resourcewoker_metrics "github.com/tidbcloud/observability/pkg/resourceworker/metrics/clusters"
	integrationtask_metrics "github.com/tidbcloud/observability/pkg/resourceworker/metrics/integrationtasks"
	"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"
	controller_metrics "sigs.k8s.io/controller-runtime/pkg/metrics"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
	//+kubebuilder:scaffold:imports
)

var (
	Scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
	waitOnce sync.Once
	mgr      manager.Manager
)

//+kubebuilder:rbac:urls=/metrics,verbs=get
//+kubebuilder:rbac:groups="",resources=*,verbs=*
//+kubebuilder:rbac:groups=apps,resources=*,verbs=*
//+kubebuilder:rbac:groups=batch,resources=jobs,verbs=*
//+kubebuilder:rbac:groups=monitoring.coreos.com,resources=*,verbs=*
//+kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses,verbs=create;delete;get;list;patch;update;watch
//+kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses/status,verbs=get
//+kubebuilder:rbac:groups=observability.pingcap.com,resources=*,verbs=*
//+kubebuilder:rbac:groups=operator.victoriametrics.com,resources=*,verbs=create;delete;get;list;patch;update;watch
//+kubebuilder:rbac:groups=rbac.authorization.k8s.io,resources=*,verbs=create;delete;get;list;patch;update;watch

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(Scheme))
	utilruntime.Must(observabilitypingcapcomv1.AddToScheme(Scheme))
	utilruntime.Must(prometheusv1.AddToScheme(Scheme))
	utilruntime.Must(prometheusv1alpha1.AddToScheme(Scheme))
	utilruntime.Must(vmv1.AddToScheme(Scheme))
	//+kubebuilder:scaffold:scheme
}

func GetManager() manager.Manager {
	waitOnce.Do(func() {
		//We will sleep here for 1 second to mitigate the low probability of panic caused by mgr being used before manager start
		time.Sleep(1 * time.Second)
	})
	return mgr
}

// SetManager is used for test
func SetManager(m manager.Manager) {
	mgr = m
}

func InitManager(ctx context.Context, rdsCli myclient.Client, serviceInfo structs.ServiceInfo) {
	ctrl.SetLogger(zapr.NewLogger(log.L()))

	var err error
	kubeconf := ctrl.GetConfigOrDie()
	kubeconf.QPS = 50
	kubeconf.Burst = 100

	mgr, err = ctrl.NewManager(kubeconf, ctrl.Options{
		Scheme: Scheme,
		// Port:             9443,
		LeaderElection:   false,
		LeaderElectionID: "650a144b.observability.pingcap.com",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}
	if err = (s3.NewS3Reconciler(mgr, ctrl.Log.WithName("controllers").WithName("S3"), serviceInfo)).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "S3")
		os.Exit(1)
	}
	if err = (cluster.NewClusterReconciler(mgr, ctrl.Log.WithName("controllers").WithName("Cluster"), serviceInfo)).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Cluster")
		os.Exit(1)
	}
	if err = (endpointservice.NewEndpointServiceReconciler(mgr, ctrl.Log.WithName("controllers").WithName("EndpointService"), serviceInfo)).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "EndpointService")
		os.Exit(1)
	}
	if err = (iam.NewIAMReconciler(mgr, ctrl.Log.WithName("controllers").WithName("IAM"), serviceInfo)).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "IAM")
		os.Exit(1)
	}

	if serviceInfo.ControllerConfig.IntegrationTaskConfig.Enable {
		if err = (integrationtaskv2.NewIntegrationTaskReconciler(mgr, ctrl.Log.WithName("controllers").WithName("IntegrationTaskV2"), serviceInfo)).SetupWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create controller", "controller", "IntegrationTaskV2")
			os.Exit(1)
		}
	}

	if err = (privateendpoints.NewPrivateEndpointReconciler(mgr, ctrl.Log.WithName("controllers").WithName("PrivateEndpoint"), serviceInfo)).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "PrivateEndpoint")
		os.Exit(1)
	}

	if serviceInfo.ControllerConfig.ServerlessConfig.EnableRDSClient {
		serverlessClusterReconciler := serverless.ServerlessClusterReconciler{
			Client:    mgr.GetClient(),
			RdsClient: rdsCli,
			Logger:    ctrl.Log.WithName("controllers").WithName("ServerlessCluster"),
			Config:    serviceInfo,
		}
		if err = serverlessClusterReconciler.SetupWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create controller", "controller", "ServerlessCluster")
			os.Exit(1)
		}
	}

	//setup metrics
	setupMetrics(mgr.GetClient(), rdsCli, ctrl.Log.WithName("metrics"), serviceInfo)
	//start gc woker
	go gc.NewGC(constants.ResourceWorkerGC, ctrl.Log.WithName("gc_worker"), mgr.GetClient()).Run(ctx)
	//+kubebuilder:scaffold:builder
}

type Options struct {
	ZapOpts                      *zap.Options
	MetricsAddr                  string
	HealthProbeAddr              string
	EnableSubscriptionController bool
	RequeueInterval              time.Duration
	RegionCacheSyncInterval      time.Duration
	AllowPartialSync             bool
}

func InitGlobalManager(ctx context.Context, opts *Options) {
	ctrl.SetLogger(zapr.NewLogger(log.L()))
	var err error
	mgr, err = ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme: Scheme,
		// Port:                   9443,
		Metrics:                metricsserver.Options{BindAddress: opts.MetricsAddr},
		HealthProbeBindAddress: opts.HealthProbeAddr,
		LeaderElection:         false,
		LeaderElectionID:       "650a144b.observability.pingcap.com",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	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)
	}
}

func InitDataServerManager(ctx context.Context, serviceInfo structs.ServiceInfo) {
	utils.InitLog(serviceInfo.LogLevel)
	ctrl.SetLogger(zapr.NewLogger(log.L()))

	var err error
	kubeconf := ctrl.GetConfigOrDie()
	kubeconf.QPS = 50
	kubeconf.Burst = 100

	mgr, err = ctrl.NewManager(kubeconf, ctrl.Options{
		Scheme: Scheme,
		// Port:             9443,
		LeaderElection:   false,
		LeaderElectionID: "650a144b.observability.pingcap.com",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}
}

func StartWorker(ctx context.Context) {
	setupLog.Info("starting manager")
	if err := mgr.Start(ctx); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}

func setupMetrics(cli client.Client, rdsCli myclient.Client, log logr.Logger, serviceInfo structs.ServiceInfo) {

	controller_metrics.Registry.MustRegister(resourcewoker_metrics.ClusterTotal)
	controller_metrics.Registry.MustRegister(resourcewoker_metrics.NewClusterCollector(cli, rdsCli, log, serviceInfo))

	controller_metrics.Registry.MustRegister(integrationtask_metrics.NewIntegrationTaskCollector(cli, log, serviceInfo))
}