/*
Copyright 2025.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package cmd

import (
	"context"
	"os"

	"github.com/spf13/cobra"
	infrav1 "github.com/tidbcloud/infra-api/api/v1"
	cloudv1 "github.com/tidbcloud/ticdc-service/api/v1"
	"github.com/tidbcloud/ticdc-service/pkg/config"
	"github.com/tidbcloud/ticdc-service/pkg/gc"
	awsapis "github.com/upbound/provider-aws/apis"
	ec2v1beta1 "github.com/upbound/provider-aws/apis/ec2/v1beta1"
	eksv1beta1 "github.com/upbound/provider-aws/apis/eks/v1beta1"
	route53v1beta1 "github.com/upbound/provider-aws/apis/route53/v1beta1"
	awsv1beta1 "github.com/upbound/provider-aws/apis/v1beta1"
	azureapis "github.com/upbound/provider-azure/apis"
	azurev1beta1 "github.com/upbound/provider-azure/apis/azure/v1beta1"
	azurecontainerv1beta1 "github.com/upbound/provider-azure/apis/containerservice/v1beta1"
	azurenetworkv1beta1 "github.com/upbound/provider-azure/apis/network/v1beta1"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
	"sigs.k8s.io/controller-runtime/pkg/predicate"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	// to ensure that exec-entrypoint and run can make use of them.
	endpointctl "github.com/tidbcloud/ticdc-service/controllers/sink-endpoint"
	cdcctl "github.com/tidbcloud/ticdc-service/controllers/ticdc"
	"github.com/tidbcloud/ticdc-service/pkg/regionalservice"
	computev1beta1 "github.com/upbound/provider-gcp/apis/compute/v1beta1"
	gcpcontainerv1beta1 "github.com/upbound/provider-gcp/apis/container/v1beta1"
	dnsv1beta1 "github.com/upbound/provider-gcp/apis/dns/v1beta1"
	gcpv1beta1 "github.com/upbound/provider-gcp/apis/v1beta1"
	"k8s.io/apimachinery/pkg/runtime"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
	"sigs.k8s.io/controller-runtime/pkg/webhook"
	// +kubebuilder:scaffold:imports
)

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

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(cloudv1.AddToScheme(scheme))
	utilruntime.Must(infrav1.AddToScheme(scheme))
	// crossplane azure scheme
	utilruntime.Must(azureapis.AddToScheme(scheme))
	utilruntime.Must(azurev1beta1.AddToScheme(scheme))
	utilruntime.Must(azurecontainerv1beta1.AddToScheme(scheme))
	utilruntime.Must(azurenetworkv1beta1.AddToScheme(scheme))
	// crossplane aws scheme
	utilruntime.Must(awsapis.AddToScheme(scheme))
	utilruntime.Must(awsv1beta1.SchemeBuilder.AddToScheme(scheme))
	utilruntime.Must(ec2v1beta1.AddToScheme(scheme))
	utilruntime.Must(eksv1beta1.AddToScheme(scheme))
	utilruntime.Must(route53v1beta1.AddToScheme(scheme))
	// crossplane gcp scheme
	utilruntime.Must(gcpv1beta1.SchemeBuilder.AddToScheme(scheme))
	utilruntime.Must(gcpcontainerv1beta1.AddToScheme(scheme))
	utilruntime.Must(dnsv1beta1.AddToScheme(scheme))
	utilruntime.Must(computev1beta1.AddToScheme(scheme))
	// +kubebuilder:scaffold:scheme
	rootCmd.AddCommand(controllerCmd)
}

var controllerCmd = &cobra.Command{
	Use:   "controller",
	Short: "run controllers to manage crd resources",
	Run: func(cmd *cobra.Command, args []string) {
		startControllers()
	},
}

func startControllers() {
	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&zap.Options{})))
	conf, err := config.LoadConfig(cfgFile)
	if err != nil {
		setupLog.Error(err, "unable to load config")
		os.Exit(1)
	}
	webhookServer := webhook.NewServer(webhook.Options{})

	// Metrics endpoint is enabled in 'config/default/kustomization.yaml'. The Metrics options configure the server.
	// More info:
	// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.19.1/pkg/metrics/server
	// - https://book.kubebuilder.io/reference/metrics.html
	metricsServerOptions := metricsserver.Options{
		BindAddress: conf.MetricsAddr,
	}

	var kubeCfg *rest.Config
	if conf.Kubeconfig != "" {
		setupLog.Info("using the provided kubeconfig", "path", conf.Kubeconfig)
		kubeCfg, err = clientcmd.BuildConfigFromFlags("", conf.Kubeconfig)
	} else {
		setupLog.Info("using the in-cluster kubeconfig")
		kubeCfg = ctrl.GetConfigOrDie()
	}

	if err != nil {
		setupLog.Error(err, "unable to get kubeconfig")
		os.Exit(1)
	}

	mgr, err := ctrl.NewManager(kubeCfg, ctrl.Options{
		Scheme:                 scheme,
		Metrics:                metricsServerOptions,
		WebhookServer:          webhookServer,
		HealthProbeBindAddress: conf.ProbeAddr,
		LeaderElection:         conf.EnableLeaderElection,
		LeaderElectionID:       "6b272752.cdc.tidbcloud.com",
		// LeaderElectionReleaseOnCancel defines if the leader should step down voluntarily
		// when the Manager ends. This requires the binary to immediately end when the
		// Manager is stopped, otherwise, this setting is unsafe. Setting this significantly
		// speeds up voluntary leader transitions as the new leader don't have to wait
		// LeaseDuration time first.
		//
		// In the default scaffold provided, the program ends immediately after
		// the manager stops, so would be fine to enable this option. However,
		// if you are doing or is intended to do any operation such as perform cleanups
		// after the manager stops then its usage might be unsafe.
		// LeaderElectionReleaseOnCancel: true,
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	preds, err := predicate.LabelSelectorPredicate(conf.Predicate)
	if err != nil {
		setupLog.Error(err, "unable to create predicate")
		os.Exit(1)
	}
	regionalCli := regionalservice.NewRegionalServiceClient(conf.RegionalServiceBaseURL)

	if err = (&endpointctl.SinkEndpointReconciler{
		Client:        mgr.GetClient(),
		Scheme:        mgr.GetScheme(),
		Cache:         mgr.GetCache(),
		EventRecorder: mgr.GetEventRecorderFor("sinkendpoint"),
		Config:        conf,
	}).SetupWithManager(mgr, preds); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "SinkEndpoint")
		os.Exit(1)
	}
	if err = (&cdcctl.TiCDCReconciler{
		Client:        mgr.GetClient(),
		Scheme:        mgr.GetScheme(),
		Cache:         mgr.GetCache(),
		EventRecorder: mgr.GetEventRecorderFor("ticdc"),
		RegionalCli:   regionalCli,
		Config:        conf,
	}).SetupWithManager(mgr, preds); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "TiCDC")
		os.Exit(1)
	}
	// +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)
	}

	go func() {
		setupLog.Error(gc.NewGC(conf, mgr.GetClient()).Run(context.Background()), "gc worker failed")
	}()

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