package node_controller

import (
	"context"

	"github.com/pingcap/errors"
	"go.uber.org/multierr"
	corev1 "k8s.io/api/core/v1"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/builder"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	envutil "sigs.k8s.io/controller-runtime/pkg/envtest"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	"sigs.k8s.io/controller-runtime/pkg/predicate"

	"github.com/tidbcloud/infra-api/controllers/common"

	"github.com/tidbcloud/infra-api/pkg/consts"
	"github.com/tidbcloud/infra-api/pkg/gardener/core/apis/v1beta1"
	"github.com/tidbcloud/infra-api/pkg/providers/aws"
	"github.com/tidbcloud/infra-api/pkg/providers/gcp"

	"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1"

	"github.com/tidbcloud/infra-api/pkg/gardener"
	"github.com/tidbcloud/infra-api/pkg/gitops"
)

type ClusterNodeControllersRegister struct {
	ConfigProvider gitops.ConfigProvider
	InfraClient    client.Client
	AWSClient      aws.Client
	GCPClient      gcp.GCPAPI

	CRDPaths []string
}

func (c *ClusterNodeControllersRegister) Regist(mgr manager.Manager, shoot *v1beta1.Shoot, gardenerAPI gardener.GardenerAPI) error {
	shootName := shoot.Name
	// cluster node scaler
	scaler := &ClusterNodeScaler{
		ConfigProvider: c.ConfigProvider,
		InfraClient:    c.InfraClient,
		log:            ctrl.Log.WithName("controllers").WithName("NodeScaler").WithName("shoot").WithName(shootName),
		shootClient:    mgr.GetClient(),
		shootName:      shootName,
		gardener:       gardenerAPI,
	}
	scaler.log.Info("controller registered")

	// cluster node protector
	protector := &ClusterNodeProtector{
		InfraClient: c.InfraClient,
		log:         ctrl.Log.WithName("controllers").WithName("NodeProtector").WithName("shoot").WithName(shootName),
		shootClient: mgr.GetClient(),
	}
	var protectionEditor NodeProtectionEditor
	switch shoot.Spec.Provider.Type {
	case consts.ProviderTypeAWS:
		protectionEditor = &AWSNodeProtectionEditor{
			awsAPI: c.AWSClient,
			region: shoot.Spec.Region,
		}
	case consts.ProviderTypeGCP:
		protectionEditor = &GCPNodeProtectionEditor{
			gcpAPI: c.GCPClient,
		}
	default:
		protector.log.Info("unsupported provider, using noop protection editor", "provider", shoot.Spec.Provider.Type)
		protectionEditor = &NoopProtectionEditor{}
	}
	protector.protectionEditor = protectionEditor

	// ensure crds required by controller
	_, err := envutil.InstallCRDs(mgr.GetConfig(), envutil.CRDInstallOptions{Paths: c.CRDPaths})
	if err != nil {
		return errors.AddStack(err)
	}

	// pod should be indexed by .spec.nodeName
	if err := mgr.GetFieldIndexer().IndexField(context.TODO(), &corev1.Pod{}, "spec.nodeName", func(obj client.Object) []string {
		pod := obj.(*corev1.Pod)
		return []string{pod.Spec.NodeName}
	}); err != nil {
		return err
	}

	var errs error
	err = ctrl.NewControllerManagedBy(mgr).
		For(&v1alpha1.TidbCluster{}, builder.WithPredicates(predicate.GenerationChangedPredicate{})).
		WithOptions(controller.Options{RateLimiter: common.DefaultRateLimiter()}).
		Complete(scaler)
	if err != nil {
		errs = multierr.Append(errs, err)
	}
	err = ctrl.NewControllerManagedBy(mgr).
		For(&corev1.Node{}).
		WithOptions(controller.Options{RateLimiter: common.DefaultRateLimiter()}).
		Complete(protector)
	if err != nil {
		errs = multierr.Append(errs, err)
	}
	return errs
}