/*
 * SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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 controller

import (
	"context"
	"fmt"
	"sort"
	"strings"

	grovev1alpha1 "github.com/NVIDIA/grove/operator/api/core/v1alpha1"
	"k8s.io/apimachinery/pkg/api/errors"

	"github.com/ai-dynamo/dynamo/deploy/operator/internal/discovery"
	"github.com/ai-dynamo/dynamo/deploy/operator/internal/secret"

	networkingv1beta1 "istio.io/client-go/pkg/apis/networking/v1beta1"
	corev1 "k8s.io/api/core/v1"
	networkingv1 "k8s.io/api/networking/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/client-go/scale"
	"k8s.io/client-go/tools/record"
	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/controllerutil"
	"sigs.k8s.io/controller-runtime/pkg/event"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/log"
	"sigs.k8s.io/controller-runtime/pkg/predicate"

	"github.com/ai-dynamo/dynamo/deploy/operator/api/v1alpha1"
	nvidiacomv1alpha1 "github.com/ai-dynamo/dynamo/deploy/operator/api/v1alpha1"
	"github.com/ai-dynamo/dynamo/deploy/operator/internal/consts"
	commoncontroller "github.com/ai-dynamo/dynamo/deploy/operator/internal/controller_common"
	"github.com/ai-dynamo/dynamo/deploy/operator/internal/dynamo"
	webhookvalidation "github.com/ai-dynamo/dynamo/deploy/operator/internal/webhook/validation"
	rbacv1 "k8s.io/api/rbac/v1"
)

type State string
type Reason string
type Message string

const (
	FailedState  State = "failed"
	ReadyState   State = "successful"
	PendingState State = "pending"
)

type etcdStorage interface {
	DeleteKeys(ctx context.Context, prefix string) error
}

// rbacManager interface for managing RBAC resources
type rbacManager interface {
	EnsureServiceAccountWithRBAC(ctx context.Context, targetNamespace, serviceAccountName, clusterRoleName string) error
}

// DynamoGraphDeploymentReconciler reconciles a DynamoGraphDeployment object
type DynamoGraphDeploymentReconciler struct {
	client.Client
	Config                commoncontroller.Config
	Recorder              record.EventRecorder
	DockerSecretRetriever dockerSecretRetriever
	ScaleClient           scale.ScalesGetter
	MPISecretReplicator   *secret.SecretReplicator
	RBACManager           rbacManager
}

// +kubebuilder:rbac:groups=nvidia.com,resources=dynamographdeployments,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=nvidia.com,resources=dynamographdeployments/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=nvidia.com,resources=dynamographdeployments/finalizers,verbs=update
// +kubebuilder:rbac:groups=nvidia.com,resources=dynamographdeploymentscalingadapters,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=grove.io,resources=podcliquesets,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=grove.io,resources=podcliques/scale,verbs=get;update;patch
// +kubebuilder:rbac:groups=grove.io,resources=podcliquescalinggroups/scale,verbs=get;update;patch
// +kubebuilder:rbac:groups=scheduling.run.ai,resources=queues,verbs=get;list

// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
// TODO(user): Modify the Reconcile function to compare the state specified by
// the DynamoGraphDeployment object against the actual cluster state, and then
// perform operations to make the cluster state reflect the state specified by
// the user.
//
// For more details, check Reconcile and its Result here:
// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.19.1/pkg/reconcile
func (r *DynamoGraphDeploymentReconciler) Reconcile(ctx context.Context, req ctrl.Request) (result ctrl.Result, err error) {
	logger := log.FromContext(ctx)

	reason := Reason("undefined")
	message := Message("")
	state := PendingState
	// retrieve the CRD
	dynamoDeployment := &nvidiacomv1alpha1.DynamoGraphDeployment{}
	if err = r.Get(ctx, req.NamespacedName, dynamoDeployment); err != nil {
		return ctrl.Result{}, client.IgnoreNotFound(err)
	}

	defer func() {
		// Skip status update if DGD is being deleted
		if !dynamoDeployment.GetDeletionTimestamp().IsZero() {
			logger.Info("Reconciliation done - skipping status update for deleted resource")
			return
		}

		if err != nil {
			state = FailedState
			message = Message(err.Error())
			logger.Error(err, "Reconciliation failed")
		}
		dynamoDeployment.SetState(string(state))

		readyStatus := metav1.ConditionFalse
		if state == ReadyState {
			readyStatus = metav1.ConditionTrue
		}

		// Update Ready condition
		dynamoDeployment.AddStatusCondition(metav1.Condition{
			Type:               "Ready",
			Status:             readyStatus,
			Reason:             string(reason),
			Message:            string(message),
			LastTransitionTime: metav1.Now(),
		})

		updateErr := r.Status().Update(ctx, dynamoDeployment)
		if updateErr != nil {
			logger.Error(updateErr, "Unable to update the CRD status", "crd", req.NamespacedName, "state", state, "reason", reason, "message", message)
			// Set err to trigger requeue
			if err == nil {
				err = updateErr
			}
		}
		logger.Info("Reconciliation done")
	}()

	// Validate the DynamoGraphDeployment spec (defense in depth - only when webhooks are disabled)
	if !r.Config.WebhooksEnabled {
		validator := webhookvalidation.NewDynamoGraphDeploymentValidator(dynamoDeployment)
		if _, validationErr := validator.Validate(); validationErr != nil {
			logger.Error(validationErr, "DynamoGraphDeployment validation failed, refusing to reconcile")

			// Set validation error state and reason (defer will update status)
			state = FailedState
			reason = Reason("ValidationFailed")
			message = Message(fmt.Sprintf("Validation failed: %v", validationErr))

			// Record event for visibility
			r.Recorder.Event(dynamoDeployment, corev1.EventTypeWarning, "ValidationFailed", validationErr.Error())

			// Don't requeue - user must fix the spec
			logger.Info("DynamoGraphDeployment is invalid, not reconciling until spec is fixed")

			// Return without error so defer updates status but doesn't requeue
			return ctrl.Result{}, nil
		}
	}

	deleted, err := commoncontroller.HandleFinalizer(ctx, dynamoDeployment, r.Client, r)
	if err != nil {
		logger.Error(err, "failed to handle the finalizer")
		reason = "failed_to_handle_the_finalizer"
		return ctrl.Result{}, err
	}
	if deleted {
		return ctrl.Result{}, nil
	}
	reconcileResult, err := r.reconcileResources(ctx, dynamoDeployment)
	state = reconcileResult.State
	reason = reconcileResult.Reason
	message = reconcileResult.Message
	dynamoDeployment.Status.Services = reconcileResult.ServiceStatus

	if err != nil {
		logger.Error(err, "failed to reconcile the resources")
		reason = "failed_to_reconcile_the_resources"
		return ctrl.Result{}, err
	}
	return ctrl.Result{}, nil
}

type Resource interface {
	IsReady() (ready bool, reason string)
	GetName() string
	GetServiceStatuses() map[string]v1alpha1.ServiceReplicaStatus
}

type ReconcileResult struct {
	State         State
	Reason        Reason
	Message       Message
	ServiceStatus map[string]nvidiacomv1alpha1.ServiceReplicaStatus
}

func (r *DynamoGraphDeploymentReconciler) reconcileResources(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) (ReconcileResult, error) {
	logger := log.FromContext(ctx)

	// Ensure planner RBAC exists in cluster-wide mode
	if r.Config.RestrictedNamespace == "" {
		if r.RBACManager == nil {
			return ReconcileResult{}, fmt.Errorf("RBAC manager not initialized in cluster-wide mode")
		}
		if r.Config.RBAC.PlannerClusterRoleName == "" {
			return ReconcileResult{}, fmt.Errorf("planner ClusterRole name is required in cluster-wide mode")
		}
		if err := r.RBACManager.EnsureServiceAccountWithRBAC(
			ctx,
			dynamoDeployment.Namespace,
			consts.PlannerServiceAccountName,
			r.Config.RBAC.PlannerClusterRoleName,
		); err != nil {
			logger.Error(err, "Failed to ensure planner RBAC")
			return ReconcileResult{}, fmt.Errorf("failed to ensure planner RBAC: %w", err)
		}
	}

	// Reconcile top-level PVCs first
	err := r.reconcilePVCs(ctx, dynamoDeployment)
	if err != nil {
		logger.Error(err, "Failed to reconcile top-level PVCs")
		return ReconcileResult{}, fmt.Errorf("failed to reconcile top-level PVCs: %w", err)
	}

	// Reconcile DynamoGraphDeploymentScalingAdapters for each service
	err = r.reconcileScalingAdapters(ctx, dynamoDeployment)
	if err != nil {
		logger.Error(err, "Failed to reconcile scaling adapters")
		return ReconcileResult{}, fmt.Errorf("failed to reconcile scaling adapters: %w", err)
	}

	// Reconcile the SA, Role and RoleBinding if k8s discovery is enabled
	err = r.reconcileK8sDiscoveryResources(ctx, dynamoDeployment)
	if err != nil {
		logger.Error(err, "Failed to reconcile K8s discovery resources")
		return ReconcileResult{}, fmt.Errorf("failed to reconcile K8s discovery resources: %w", err)
	}

	// Orchestrator selection via single boolean annotation: nvidia.com/enable-grove
	// Unset or not "false": Grove if available; else component mode
	// "false": component mode (multinode -> LWS; single-node -> standard)
	enableGrove := true
	if dynamoDeployment.Annotations != nil && strings.ToLower(dynamoDeployment.Annotations[consts.KubeAnnotationEnableGrove]) == consts.KubeLabelValueFalse {
		enableGrove = false
	}

	// Determine if any service is multinode
	hasMultinode := dynamoDeployment.HasAnyMultinodeService()

	// Always ensure MPI SSH secret is available in this namespace
	if r.MPISecretReplicator != nil {
		err := r.MPISecretReplicator.Replicate(ctx, dynamoDeployment.Namespace)
		if err != nil {
			logger.Error(err, "Failed to replicate MPI secret", "namespace", dynamoDeployment.Namespace)
			return ReconcileResult{}, fmt.Errorf("failed to replicate MPI secret: %w", err)
		}
	}

	if enableGrove && r.Config.Grove.Enabled {
		logger.Info("Reconciling Grove resources", "enableGrove", enableGrove, "groveEnabled", r.Config.Grove.Enabled, "hasMultinode", hasMultinode, "lwsEnabled", r.Config.LWS.Enabled)
		return r.reconcileGroveResources(ctx, dynamoDeployment)
	}
	if hasMultinode && !r.Config.LWS.Enabled {
		err := fmt.Errorf("no multinode orchestrator available")
		logger.Error(err, err.Error(), "hasMultinode", hasMultinode, "lwsEnabled", r.Config.LWS.Enabled, "enableGrove", enableGrove, "groveEnabled", r.Config.Grove.Enabled)
		return ReconcileResult{}, fmt.Errorf("failed to reconcile Dynamo components deployments: %w", err)
	}
	logger.Info("Reconciling Dynamo components deployments", "hasMultinode", hasMultinode, "lwsEnabled", r.Config.LWS.Enabled, "enableGrove", enableGrove, "groveEnabled", r.Config.Grove.Enabled)
	return r.reconcileDynamoComponentsDeployments(ctx, dynamoDeployment)

}

// scaleGroveResource scales a Grove resource using the generic scaling function
func (r *DynamoGraphDeploymentReconciler) scaleGroveResource(ctx context.Context, resourceName, namespace string, newReplicas int32, resourceType string) error {
	logger := log.FromContext(ctx)
	// Determine the GroupVersionResource based on resource type
	var gvr schema.GroupVersionResource
	switch resourceType {
	case "PodClique":
		gvr = consts.PodCliqueGVR
	case "PodCliqueScalingGroup":
		gvr = consts.PodCliqueScalingGroupGVR
	default:
		return fmt.Errorf("unsupported Grove resource type: %s", resourceType)
	}

	// Use the generic scaling function
	err := commoncontroller.ScaleResource(ctx, r.ScaleClient, gvr, namespace, resourceName, newReplicas)
	if err != nil {
		if errors.IsNotFound(err) {
			// Resource doesn't exist yet - this is normal during initial creation when Grove is still creating the resources asynchronously
			logger.V(1).Info("Grove resource not found yet, skipping scaling for now - will retry on next reconciliation", "gvr", gvr, "name", resourceName, "namespace", namespace)
			return nil
		}
	}
	return err
}

func (r *DynamoGraphDeploymentReconciler) reconcileGrovePodCliqueSet(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) (*commoncontroller.Resource, error) {
	logger := log.FromContext(ctx)

	// generate the dynamoComponentsDeployments from the config
	grovePodCliqueSet, err := dynamo.GenerateGrovePodCliqueSet(ctx, dynamoDeployment, r.Config, r.DockerSecretRetriever)
	if err != nil {
		logger.Error(err, "failed to generate the Grove GangSet")
		return nil, fmt.Errorf("failed to generate the Grove GangSet: %w", err)
	}
	_, syncedGrovePodCliqueSet, err := commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*grovev1alpha1.PodCliqueSet, bool, error) {
		return grovePodCliqueSet, false, nil
	})
	if err != nil {
		logger.Error(err, "failed to sync the Grove GangSet")
		return nil, fmt.Errorf("failed to sync the Grove GangSet: %w", err)
	}
	syncedGrovePodCliqueSetAsResource, err := commoncontroller.NewResourceWithServiceStatuses(
		syncedGrovePodCliqueSet,
		func() (bool, string, map[string]v1alpha1.ServiceReplicaStatus) {
			// Grove readiness: all underlying PodCliques and PodCliqueScalingGroups have replicas == availableReplicas
			allComponentsReady, reason, serviceStatuses := dynamo.GetComponentReadinessAndServiceReplicaStatuses(ctx, r.Client, dynamoDeployment)
			if !allComponentsReady {
				return false, reason, serviceStatuses
			}
			return true, "", serviceStatuses
		},
	)
	if err != nil {
		logger.Error(err, "failed to create the Grove PodClique Set resource")
		return nil, fmt.Errorf("failed to create the Grove PodClique Set resource: %w", err)
	}
	return syncedGrovePodCliqueSetAsResource, nil
}

// reconcileGroveScaling handles scaling operations for Grove resources based on service replica changes
func (r *DynamoGraphDeploymentReconciler) reconcileGroveScaling(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) error {
	logger := log.FromContext(ctx)
	logger.V(1).Info("Reconciling Grove scaling operations")

	replicaIndex := 0
	for serviceName, component := range dynamoDeployment.Spec.Services {
		// Skip if replicas are not specified
		if component.Replicas == nil {
			continue
		}

		numberOfNodes := component.GetNumberOfNodes()
		isMultinode := numberOfNodes > 1

		if isMultinode {
			// Scale PodCliqueScalingGroup for multinode services
			// Grove naming pattern: {DGD.name}-{replicaIndex}-{serviceName}
			resourceName := fmt.Sprintf("%s-%d-%s", dynamoDeployment.Name, replicaIndex, strings.ToLower(serviceName))
			err := r.scaleGroveResource(ctx,
				resourceName,
				dynamoDeployment.Namespace,
				*component.Replicas,
				"PodCliqueScalingGroup")
			if err != nil {
				logger.Error(err, "Failed to scale PodCliqueScalingGroup", "serviceName", serviceName, "resourceName", resourceName, "replicas", *component.Replicas)
				return fmt.Errorf("failed to scale PodCliqueScalingGroup %s: %w", resourceName, err)
			}
		} else {
			// Scale individual PodClique for single-node services
			// Grove naming pattern: {DGD.name}-{replicaIndex}-{serviceName}
			resourceName := fmt.Sprintf("%s-%d-%s", dynamoDeployment.Name, replicaIndex, strings.ToLower(serviceName))
			err := r.scaleGroveResource(ctx,
				resourceName,
				dynamoDeployment.Namespace,
				*component.Replicas,
				"PodClique")
			if err != nil {
				logger.Error(err, "Failed to scale PodClique", "serviceName", serviceName, "resourceName", resourceName, "replicas", *component.Replicas)
				return fmt.Errorf("failed to scale PodClique %s: %w", resourceName, err)
			}
		}
	}

	logger.V(1).Info("Successfully reconciled Grove scaling operations")
	return nil
}

func (r *DynamoGraphDeploymentReconciler) reconcileGroveResources(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) (ReconcileResult, error) {
	logger := log.FromContext(ctx)

	grovePodCliqueSetAsResource, err := r.reconcileGrovePodCliqueSet(ctx, dynamoDeployment)
	if err != nil {
		logger.Error(err, "failed to reconcile the Grove PodClique Set")
		return ReconcileResult{}, fmt.Errorf("failed to reconcile the Grove PodClique Set: %w", err)
	}

	// Handle Grove scaling operations after structural changes
	if err := r.reconcileGroveScaling(ctx, dynamoDeployment); err != nil {
		logger.Error(err, "failed to reconcile Grove scaling")
		return ReconcileResult{}, fmt.Errorf("failed to reconcile Grove scaling: %w", err)
	}

	// Reconcile headless services for model endpoint discovery
	if err := dynamo.ReconcileModelServicesForComponents(
		ctx,
		r,
		dynamoDeployment,
		dynamoDeployment.Spec.Services,
		dynamoDeployment.Namespace,
	); err != nil {
		logger.Error(err, "failed to reconcile model services")
		return ReconcileResult{}, fmt.Errorf("failed to reconcile model services: %w", err)
	}

	resources := []Resource{grovePodCliqueSetAsResource}
	for componentName, component := range dynamoDeployment.Spec.Services {

		// if k8s discovery is enabled, create a service for each component
		// else, only create for the frontend component
		isK8sDiscoveryEnabled := r.Config.IsK8sDiscoveryEnabled(dynamoDeployment.Annotations)
		if isK8sDiscoveryEnabled || component.ComponentType == consts.ComponentTypeFrontend {
			mainComponentService, err := dynamo.GenerateComponentService(ctx, dynamoDeployment, component, componentName, isK8sDiscoveryEnabled)
			if err != nil {
				logger.Error(err, "failed to generate the main component service")
				return ReconcileResult{}, fmt.Errorf("failed to generate the main component service: %w", err)
			}
			_, syncedMainComponentService, err := commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*corev1.Service, bool, error) {
				return mainComponentService, false, nil
			})
			if err != nil {
				logger.Error(err, "failed to sync the main component service")
				return ReconcileResult{}, fmt.Errorf("failed to sync the main component service: %w", err)
			}
			if syncedMainComponentService != nil {
				mainComponentServiceAsResource, err := commoncontroller.NewResource(syncedMainComponentService,
					func() (bool, string) {
						return true, ""
					})
				if err != nil {
					return ReconcileResult{}, fmt.Errorf("failed to sync the main component service: %w", err)
				}
				resources = append(resources, mainComponentServiceAsResource)
			}
		}

		if component.ComponentType == consts.ComponentTypeFrontend {
			// generate the main component ingress
			ingressSpec := dynamo.GenerateDefaultIngressSpec(dynamoDeployment, r.Config.IngressConfig)
			if component.Ingress != nil {
				ingressSpec = *component.Ingress
			}
			mainComponentIngress := dynamo.GenerateComponentIngress(ctx, dynamo.GetDynamoComponentName(dynamoDeployment, componentName), dynamoDeployment.Namespace, ingressSpec)
			_, syncedMainComponentIngress, err := commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*networkingv1.Ingress, bool, error) {
				if !ingressSpec.Enabled || ingressSpec.IngressControllerClassName == nil {
					logger.Info("Ingress is not enabled")
					return mainComponentIngress, true, nil
				}
				return mainComponentIngress, false, nil
			})
			if err != nil {
				logger.Error(err, "failed to sync the main component ingress")
				return ReconcileResult{}, fmt.Errorf("failed to sync the main component ingress: %w", err)
			}
			if syncedMainComponentIngress != nil {
				mainComponentIngressAsResource, err := commoncontroller.NewResource(syncedMainComponentIngress,
					func() (bool, string) {
						return true, ""
					})
				if err != nil {
					return ReconcileResult{}, fmt.Errorf("failed to create the main component ingress resource: %w", err)
				}
				resources = append(resources, mainComponentIngressAsResource)
			}
			// generate the main component virtual service
			if r.Config.IngressConfig.UseVirtualService() {
				mainComponentVirtualService := dynamo.GenerateComponentVirtualService(ctx, dynamo.GetDynamoComponentName(dynamoDeployment, componentName), dynamoDeployment.Namespace, ingressSpec)
				_, syncedMainComponentVirtualService, err := commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*networkingv1beta1.VirtualService, bool, error) {
					if !ingressSpec.IsVirtualServiceEnabled() {
						logger.Info("VirtualService is not enabled")
						return mainComponentVirtualService, true, nil
					}
					return mainComponentVirtualService, false, nil
				})
				if err != nil {
					logger.Error(err, "failed to sync the main component virtual service")
					return ReconcileResult{}, fmt.Errorf("failed to sync the main component virtual service: %w", err)
				}
				if syncedMainComponentVirtualService != nil {
					mainComponentVirtualServiceAsResource, err := commoncontroller.NewResource(syncedMainComponentVirtualService,
						func() (bool, string) {
							return true, ""
						})
					if err != nil {
						return ReconcileResult{}, fmt.Errorf("failed to create the main component virtual service resource: %w", err)
					}
					resources = append(resources, mainComponentVirtualServiceAsResource)
				}
			}
		}
	}
	return r.checkResourcesReadiness(resources), nil
}

func (r *DynamoGraphDeploymentReconciler) checkResourcesReadiness(resources []Resource) ReconcileResult {
	// Sort resources by name to ensure deterministic ordering
	sort.Slice(resources, func(i, j int) bool {
		return resources[i].GetName() < resources[j].GetName()
	})

	var notReadyReasons []string
	notReadyResources := []string{}
	serviceStatuses := make(map[string]v1alpha1.ServiceReplicaStatus)
	for _, resource := range resources {
		ready, reason := resource.IsReady()

		resourceServiceStatuses := resource.GetServiceStatuses()
		for serviceName, serviceStatus := range resourceServiceStatuses {
			serviceStatuses[serviceName] = serviceStatus
		}

		if !ready {
			notReadyResources = append(notReadyResources, resource.GetName())
			notReadyReasons = append(notReadyReasons, fmt.Sprintf("%s: %s", resource.GetName(), reason))
		}
	}

	if len(notReadyResources) == 0 {
		return ReconcileResult{
			State:         ReadyState,
			Reason:        "all_resources_are_ready",
			Message:       Message("All resources are ready"),
			ServiceStatus: serviceStatuses,
		}
	}
	return ReconcileResult{
		State:         PendingState,
		Reason:        "some_resources_are_not_ready",
		Message:       Message(fmt.Sprintf("Resources not ready: %s", strings.Join(notReadyReasons, "; "))),
		ServiceStatus: serviceStatuses,
	}
}

func (r *DynamoGraphDeploymentReconciler) reconcileDynamoComponentsDeployments(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) (ReconcileResult, error) {
	resources := []Resource{}
	logger := log.FromContext(ctx)

	// generate the dynamoComponentsDeployments from the config
	defaultIngressSpec := dynamo.GenerateDefaultIngressSpec(dynamoDeployment, r.Config.IngressConfig)
	dynamoComponentsDeployments, err := dynamo.GenerateDynamoComponentsDeployments(ctx, dynamoDeployment, &defaultIngressSpec)
	if err != nil {
		logger.Error(err, "failed to generate the DynamoComponentsDeployments")
		return ReconcileResult{}, fmt.Errorf("failed to generate the DynamoComponentsDeployments: %w", err)
	}

	// reconcile the dynamoComponentsDeployments
	for serviceName, dynamoComponentDeployment := range dynamoComponentsDeployments {
		logger.Info("Reconciling the DynamoComponentDeployment", "serviceName", serviceName, "dynamoComponentDeployment", dynamoComponentDeployment)
		_, dynamoComponentDeployment, err = commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*nvidiacomv1alpha1.DynamoComponentDeployment, bool, error) {
			return dynamoComponentDeployment, false, nil
		})
		if err != nil {
			logger.Error(err, "failed to sync the DynamoComponentDeployment")
			return ReconcileResult{}, fmt.Errorf("failed to sync the DynamoComponentDeployment: %w", err)
		}
		resources = append(resources, dynamoComponentDeployment)
	}

	return r.checkResourcesReadiness(resources), nil
}

// reconcilePVC reconciles a single top-level PVC defined in the DynamoGraphDeployment spec
func (r *DynamoGraphDeploymentReconciler) reconcilePVC(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment, pvcName string, pvcConfig nvidiacomv1alpha1.PVC) (*corev1.PersistentVolumeClaim, error) {
	logger := log.FromContext(ctx)

	pvc := &corev1.PersistentVolumeClaim{}
	pvcNamespacedName := types.NamespacedName{Name: pvcName, Namespace: dynamoDeployment.Namespace}
	err := r.Get(ctx, pvcNamespacedName, pvc)
	if err != nil && client.IgnoreNotFound(err) != nil {
		logger.Error(err, "Unable to retrieve top-level PVC", "pvcName", pvcName)
		return nil, err
	}

	// If PVC does not exist, create a new one
	if err != nil {
		if pvcConfig.Create == nil || !*pvcConfig.Create {
			logger.Error(err, "Top-level PVC does not exist and create is not enabled", "pvcName", pvcName)
			return nil, err
		}

		pvc = constructPVC(dynamoDeployment, pvcConfig)
		if err := controllerutil.SetControllerReference(dynamoDeployment, pvc, r.Client.Scheme()); err != nil {
			logger.Error(err, "Failed to set controller reference for top-level PVC", "pvcName", pvcName)
			return nil, err
		}

		err = r.Create(ctx, pvc)
		if err != nil {
			logger.Error(err, "Failed to create top-level PVC", "pvcName", pvcName)
			return nil, err
		}
		logger.Info("Top-level PVC created", "pvcName", pvcName, "namespace", dynamoDeployment.Namespace)
	}

	return pvc, nil
}

func (r *DynamoGraphDeploymentReconciler) reconcileK8sDiscoveryResources(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) error {
	logger := log.FromContext(ctx)

	if !r.Config.IsK8sDiscoveryEnabled(dynamoDeployment.Annotations) {
		logger.Info("K8s discovery is not enabled")
		return nil
	} else {
		logger.Info("K8s discovery is enabled")
	}

	serviceAccount := discovery.GetK8sDiscoveryServiceAccount(dynamoDeployment.Name, dynamoDeployment.Namespace)
	_, _, err := commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*corev1.ServiceAccount, bool, error) {
		return serviceAccount, false, nil
	})
	if err != nil {
		logger.Error(err, "failed to sync the k8s discovery service account")
		return fmt.Errorf("failed to sync the k8s discovery service account: %w", err)
	}

	role := discovery.GetK8sDiscoveryRole(dynamoDeployment.Name, dynamoDeployment.Namespace)
	_, _, err = commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*rbacv1.Role, bool, error) {
		return role, false, nil
	})
	if err != nil {
		logger.Error(err, "failed to sync the k8s discovery role")
		return fmt.Errorf("failed to sync the k8s discovery role: %w", err)
	}

	roleBinding := discovery.GetK8sDiscoveryRoleBinding(dynamoDeployment.Name, dynamoDeployment.Namespace)
	_, _, err = commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*rbacv1.RoleBinding, bool, error) {
		return roleBinding, false, nil
	})
	if err != nil {
		logger.Error(err, "failed to sync the k8s discovery role binding")
		return fmt.Errorf("failed to sync the k8s discovery role binding: %w", err)
	}

	return nil

}

// reconcilePVCs reconciles all top-level PVCs defined in the DynamoGraphDeployment spec
func (r *DynamoGraphDeploymentReconciler) reconcilePVCs(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) error {
	logger := log.FromContext(ctx)

	if dynamoDeployment.Spec.PVCs == nil {
		return nil
	}

	for _, pvcConfig := range dynamoDeployment.Spec.PVCs {
		if pvcConfig.Name == nil || *pvcConfig.Name == "" {
			logger.Error(nil, "PVC not reconcilable: name is required", "pvcConfig", pvcConfig)
			continue
		}

		pvcName := *pvcConfig.Name
		logger.Info("Reconciling top-level PVC", "pvcName", pvcName, "namespace", dynamoDeployment.Namespace)

		_, err := r.reconcilePVC(ctx, dynamoDeployment, pvcName, pvcConfig)
		if err != nil {
			return err
		}
	}

	return nil
}

// reconcileScalingAdapters ensures a DynamoGraphDeploymentScalingAdapter exists for each service in the DGD
// that has scaling adapter enabled (default). Services with scalingAdapter.disable=true will not have a DGDSA.
// This enables pluggable autoscaling via HPA, KEDA, or Planner.
func (r *DynamoGraphDeploymentReconciler) reconcileScalingAdapters(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) error {
	logger := log.FromContext(ctx)

	// Process each service - SyncResource handles create, update, and delete via toDelete flag
	for serviceName, component := range dynamoDeployment.Spec.Services {
		// Check if scaling adapter is disabled for this service
		scalingAdapterDisabled := component.ScalingAdapter != nil && component.ScalingAdapter.Disable

		// Get current replicas (default to 1 if not set)
		currentReplicas := int32(1)
		if component.Replicas != nil {
			currentReplicas = *component.Replicas
		}

		// Use SyncResource to handle creation/updates/deletion
		// When toDelete=true, SyncResource will delete the existing resource if it exists
		_, _, err := commoncontroller.SyncResource(ctx, r, dynamoDeployment, func(ctx context.Context) (*nvidiacomv1alpha1.DynamoGraphDeploymentScalingAdapter, bool, error) {
			adapterName := generateAdapterName(dynamoDeployment.Name, serviceName)
			adapter := &nvidiacomv1alpha1.DynamoGraphDeploymentScalingAdapter{
				ObjectMeta: metav1.ObjectMeta{
					Name:      adapterName,
					Namespace: dynamoDeployment.Namespace,
					Labels: map[string]string{
						consts.KubeLabelDynamoGraphDeploymentName: dynamoDeployment.Name,
						consts.KubeLabelDynamoComponent:           serviceName,
					},
				},
				Spec: nvidiacomv1alpha1.DynamoGraphDeploymentScalingAdapterSpec{
					Replicas: currentReplicas,
					DGDRef: nvidiacomv1alpha1.DynamoGraphDeploymentServiceRef{
						Name:        dynamoDeployment.Name,
						ServiceName: serviceName,
					},
				},
			}
			// Return toDelete=true if scaling adapter is disabled
			return adapter, scalingAdapterDisabled, nil
		})

		if err != nil {
			logger.Error(err, "Failed to sync DynamoGraphDeploymentScalingAdapter", "service", serviceName)
			return err
		}
	}

	// Clean up adapters for services that were removed from DGD entirely
	adapterList := &nvidiacomv1alpha1.DynamoGraphDeploymentScalingAdapterList{}
	if err := r.List(ctx, adapterList,
		client.InNamespace(dynamoDeployment.Namespace),
		client.MatchingLabels{consts.KubeLabelDynamoGraphDeploymentName: dynamoDeployment.Name},
	); err != nil {
		logger.Error(err, "Failed to list DynamoGraphDeploymentScalingAdapters")
		return err
	}

	for i := range adapterList.Items {
		adapter := &adapterList.Items[i]
		serviceName := adapter.Spec.DGDRef.ServiceName

		// Delete adapter if service no longer exists in DGD
		if _, exists := dynamoDeployment.Spec.Services[serviceName]; !exists {
			logger.Info("Deleting orphaned DynamoGraphDeploymentScalingAdapter", "adapter", adapter.Name, "service", serviceName)
			if err := r.Delete(ctx, adapter); err != nil && !errors.IsNotFound(err) {
				logger.Error(err, "Failed to delete orphaned adapter", "adapter", adapter.Name)
				return err
			}
			r.Recorder.Eventf(dynamoDeployment, corev1.EventTypeNormal, "AdapterDeleted",
				"Deleted orphaned scaling adapter %s for removed service %s", adapter.Name, serviceName)
		}
	}

	return nil
}

// generateAdapterName creates a consistent name for a DynamoGraphDeploymentScalingAdapter
// Service names are lowercased to comply with Kubernetes DNS subdomain naming requirements
func generateAdapterName(dgdName, serviceName string) string {
	return fmt.Sprintf("%s-%s", dgdName, strings.ToLower(serviceName))
}

func (r *DynamoGraphDeploymentReconciler) FinalizeResource(ctx context.Context, dynamoDeployment *nvidiacomv1alpha1.DynamoGraphDeployment) error {
	// for now doing nothing
	return nil
}

// SetupWithManager sets up the controller with the Manager.
func (r *DynamoGraphDeploymentReconciler) SetupWithManager(mgr ctrl.Manager) error {
	ctrlBuilder := ctrl.NewControllerManagedBy(mgr).
		For(&nvidiacomv1alpha1.DynamoGraphDeployment{}, builder.WithPredicates(
			predicate.GenerationChangedPredicate{},
		)).
		Named("dynamographdeployment").
		Owns(&nvidiacomv1alpha1.DynamoComponentDeployment{}, builder.WithPredicates(predicate.Funcs{
			// ignore creation cause we don't want to be called again after we create the deployment
			CreateFunc:  func(ce event.CreateEvent) bool { return false },
			DeleteFunc:  func(de event.DeleteEvent) bool { return true },
			UpdateFunc:  func(de event.UpdateEvent) bool { return true },
			GenericFunc: func(ge event.GenericEvent) bool { return true },
		})).
		Owns(&nvidiacomv1alpha1.DynamoGraphDeploymentScalingAdapter{}, builder.WithPredicates(predicate.Funcs{
			// ignore creation cause we don't want to be called again after we create the adapter
			CreateFunc:  func(ce event.CreateEvent) bool { return false },
			DeleteFunc:  func(de event.DeleteEvent) bool { return true },
			UpdateFunc:  func(de event.UpdateEvent) bool { return false }, // Adapter updates are handled by adapter controller
			GenericFunc: func(ge event.GenericEvent) bool { return false },
		})).
		Owns(&corev1.PersistentVolumeClaim{}, builder.WithPredicates(predicate.Funcs{
			// ignore creation cause we don't want to be called again after we create the PVC
			CreateFunc:  func(ce event.CreateEvent) bool { return false },
			DeleteFunc:  func(de event.DeleteEvent) bool { return true },
			UpdateFunc:  func(de event.UpdateEvent) bool { return true },
			GenericFunc: func(ge event.GenericEvent) bool { return true },
		})).
		WithEventFilter(commoncontroller.EphemeralDeploymentEventFilter(r.Config))
	if r.Config.Grove.Enabled {
		ctrlBuilder = ctrlBuilder.Owns(&grovev1alpha1.PodCliqueSet{}, builder.WithPredicates(predicate.Funcs{
			// ignore creation cause we don't want to be called again after we create the pod gang set
			CreateFunc:  func(ce event.CreateEvent) bool { return false },
			DeleteFunc:  func(de event.DeleteEvent) bool { return true },
			UpdateFunc:  func(de event.UpdateEvent) bool { return true },
			GenericFunc: func(ge event.GenericEvent) bool { return true },
		})).
			// Watch PodClique resources - only on status changes
			// Note: We don't need to watch PodCliqueScalingGroup because it's just a container
			// for PodCliques. The actual status changes happen at the PodClique level.
			Watches(
				&grovev1alpha1.PodClique{},
				handler.EnqueueRequestsFromMapFunc(r.mapPodCliqueToRequests),
				builder.WithPredicates(predicate.Funcs{
					CreateFunc: func(ce event.CreateEvent) bool { return false },
					DeleteFunc: func(de event.DeleteEvent) bool { return false },
					UpdateFunc: func(ue event.UpdateEvent) bool {
						// Only trigger on status changes (readyReplicas or replicas)
						oldPC, okOld := ue.ObjectOld.(*grovev1alpha1.PodClique)
						newPC, okNew := ue.ObjectNew.(*grovev1alpha1.PodClique)
						if !okOld || !okNew {
							return false
						}
						// Trigger if readyReplicas or replicas changed
						return oldPC.Status.ReadyReplicas != newPC.Status.ReadyReplicas ||
							oldPC.Spec.Replicas != newPC.Spec.Replicas
					},
					GenericFunc: func(ge event.GenericEvent) bool { return false },
				}),
			)
	}
	return ctrlBuilder.Complete(r)
}

func (r *DynamoGraphDeploymentReconciler) GetRecorder() record.EventRecorder {
	return r.Recorder
}

// mapPodCliqueToRequests maps a PodClique to reconcile requests for its owning DGD
// Uses the nvidia.com/dynamo-graph-deployment-name label for direct lookup - no API calls needed!
func (r *DynamoGraphDeploymentReconciler) mapPodCliqueToRequests(ctx context.Context, obj client.Object) []ctrl.Request {
	podClique, ok := obj.(*grovev1alpha1.PodClique)
	if !ok {
		return nil
	}

	// PodCliques are labeled with the DGD name and live in the same namespace
	dgdName, hasLabel := podClique.GetLabels()[consts.KubeLabelDynamoGraphDeploymentName]
	if !hasLabel || dgdName == "" {
		log.FromContext(ctx).V(1).Info("PodClique missing DGD label",
			"podClique", podClique.Name,
			"namespace", podClique.Namespace)
		return nil
	}

	return []ctrl.Request{{
		NamespacedName: types.NamespacedName{
			Name:      dgdName,
			Namespace: podClique.Namespace,
		},
	}}
}
