// Изменено: 2026-03-07
// main.go — точка входа. Запускает operator manager и REST API сервер параллельно.
// Operator manager управляет Function/Trigger CRD через reconcile loop.
// REST API (gorilla/mux) принимает запросы от Terraform provider.

package main

import (
	"context"
	"flag"
	"fmt"
	"log/slog"
	"net/http"
	"os"

	// 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"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	"k8s.io/client-go/kubernetes"
	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"

	slessv1alpha1 "gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/api/v1alpha1"
	"gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/controllers"
	slessapi "gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/internal/api"
	"gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/internal/api/handler"
	"gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/internal/builder"
	"gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/internal/config"
	"gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/internal/storage/postgres"
	"gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/internal/storage/s3"
	//+kubebuilder:scaffold:imports
)

var (
	scheme = runtime.NewScheme()
)

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

	utilruntime.Must(slessv1alpha1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	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)))

	// slog для REST API (JSON-формат для prod, text для dev)
	log := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelInfo}))

	// Загружаем конфиг из env vars
	cfg, err := config.Load()
	if err != nil {
		log.Error("load config", "err", err)
		os.Exit(1)
	}

	// Подключаемся к PostgreSQL
	pg, err := postgres.New(cfg.PostgresDSN)
	if err != nil {
		log.Error("connect postgres", "err", err)
		os.Exit(1)
	}
	defer pg.Close()

	// Применяем миграции БД — читаем SQL и передаём строкой
	migrationSQL, err := os.ReadFile("migrations/001_initial.sql")
	if err != nil {
		log.Error("read migration file", "err", err)
		os.Exit(1)
	}
	if err := pg.RunMigrations(context.Background(), string(migrationSQL)); err != nil {
		log.Error("run migrations", "err", err)
		os.Exit(1)
	}

	// S3 клиент
	s3Client, err := s3.New(cfg.S3Endpoint, cfg.S3AccessKey, cfg.S3SecretKey, cfg.S3Bucket, cfg.S3UseSSL)
	if err != nil {
		log.Error("connect s3", "err", err)
		os.Exit(1)
	}
	if err := s3Client.EnsureBucket(context.Background()); err != nil {
		log.Error("ensure s3 bucket", "err", err)
		os.Exit(1)
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 scheme,
		MetricsBindAddress:     metricsAddr,
		Port:                   9443,
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "4b6ba465.kube5s.ru",
	})
	if err != nil {
		log.Error("unable to start manager", "err", err)
		os.Exit(1)
	}

	// Builder использует k8s client из manager'а
	bldr := builder.New(mgr.GetClient(), builder.Config{
		BuilderImage:   cfg.BuilderImage,
		RegistryHost:   cfg.RegistryHost,
		RegistrySecret: cfg.RegistrySecret,
		S3Endpoint:     cfg.S3Endpoint,
		S3AccessKey:    cfg.S3AccessKey,
		S3SecretKey:    cfg.S3SecretKey,
		S3Bucket:       cfg.S3Bucket,
		Namespace:      "sless",
	})

	if err = (&controllers.FunctionReconciler{
		Client:            mgr.GetClient(),
		Scheme:            mgr.GetScheme(),
		Builder:           bldr,
		RegistrySecret:    cfg.RegistrySecret,
		OperatorNamespace: "sless",
	}).SetupWithManager(mgr); err != nil {
		log.Error("unable to create controller", "controller", "Function", "err", err)
		os.Exit(1)
	}
	if err = (&controllers.TriggerReconciler{
		Client:      mgr.GetClient(),
		Scheme:      mgr.GetScheme(),
		IngressHost: cfg.IngressHost,
		ExternalURL: cfg.ExternalURL,
	}).SetupWithManager(mgr); err != nil {
		log.Error("unable to create controller", "controller", "Trigger", "err", err)
		os.Exit(1)
	}
	if err = (&controllers.FunctionJobReconciler{
		Client:         mgr.GetClient(),
		Scheme:         mgr.GetScheme(),
		RegistrySecret: cfg.RegistrySecret,
		KubeClient:     kubernetes.NewForConfigOrDie(mgr.GetConfig()),
	}).SetupWithManager(mgr); err != nil {
		log.Error("unable to create controller", "controller", "FunctionJob", "err", err)
		os.Exit(1)
	}
	//+kubebuilder:scaffold:builder

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

	// REST API сервер — запускается параллельно с operator manager
	apiHandler := slessapi.NewRouter(&handler.Handler{
		K8s:    mgr.GetClient(),
		Scheme: mgr.GetScheme(),
		S3:     s3Client,
		PG:     pg,
		Log:    log,
	}, log)

	go func() {
		addr := fmt.Sprintf(":%d", cfg.APIPort)
		log.Info("starting REST API", "addr", addr)
		if err := http.ListenAndServe(addr, apiHandler); err != nil {
			log.Error("REST API server failed", "err", err)
			os.Exit(1)
		}
	}()

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