package webhook

import (
	"context"
	"fmt"

	"k8s.io/apimachinery/pkg/runtime"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"

	kubeclawv1alpha1 "github.com/nousresearch/kubeclaw/api/v1alpha1"
)

// AgentValidator validates Agent resources on create/update.
type AgentValidator struct{}

// +kubebuilder:webhook:path=/validate-kubeclaw-nousresearch-com-v1alpha1-agent,mutating=false,failurePolicy=fail,sideEffects=None,groups=kubeclaw.nousresearch.com,resources=agents,verbs=create;update,versions=v1alpha1,name=vagent.kubeclaw.nousresearch.com,admissionReviewVersions=v1

func (v *AgentValidator) ValidateCreate(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
	agent, ok := obj.(*kubeclawv1alpha1.Agent)
	if !ok {
		return nil, fmt.Errorf("expected Agent got %T", obj)
	}
	if agent.Spec.Identity.DisplayName == "" {
		return admission.Warnings{"Agent must have a display name"}, nil
	}
	// TODO: Validate provider references exist
	// TODO: Validate channel references exist
	// TODO: Validate workflow template references exist
	return nil, nil
}

func (v *AgentValidator) ValidateUpdate(ctx context.Context, oldObj, newObj runtime.Object) (admission.Warnings, error) {
	return nil, nil
}

func (v *AgentValidator) ValidateDelete(ctx context.Context, obj runtime.Object) (admission.Warnings, error) {
	return nil, nil
}

func (v *AgentValidator) SetupWebhookWithManager(mgr ctrl.Manager) error {
	return ctrl.NewWebhookManagedBy(mgr).
		For(&kubeclawv1alpha1.Agent{}).
		WithValidator(v).
		Complete()
}