package controller

import (
	"context"

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

	bindv1alpha1 "git.unkin.net/unkin/bind-operator/api/v1alpha1"
)

// BindViewReconciler validates a BindView and reports the number of zones bound
// to it. The view block is rendered into named.conf by the BindCluster
// controller, which watches views.
type BindViewReconciler struct {
	client.Client
	Scheme *runtime.Scheme
}

// +kubebuilder:rbac:groups=bind.unkin.net,resources=bindviews,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=bind.unkin.net,resources=bindviews/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=bind.unkin.net,resources=bindzones,verbs=get;list;watch

func (r *BindViewReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	var view bindv1alpha1.BindView
	if err := r.Get(ctx, req.NamespacedName, &view); err != nil {
		return ctrl.Result{}, client.IgnoreNotFound(err)
	}

	var zones bindv1alpha1.BindZoneList
	count := int32(0)
	if err := r.List(ctx, &zones, client.InNamespace(view.Namespace)); err == nil {
		for _, z := range zones.Items {
			if z.Spec.ClusterRef == view.Spec.ClusterRef && z.Spec.ViewRef == view.Name {
				count++
			}
		}
	}

	view.Status.ZoneCount = count
	view.Status.Ready = view.Spec.ClusterRef != ""
	view.Status.ObservedGeneration = view.Generation
	setReady(&view.Status.Conditions, view.Generation, view.Status.Ready, "Validated", "view rendered into named.conf")
	if err := r.Status().Update(ctx, &view); err != nil {
		return ctrl.Result{}, err
	}
	return ctrl.Result{}, nil
}

func (r *BindViewReconciler) SetupWithManager(mgr ctrl.Manager) error {
	return ctrl.NewControllerManagedBy(mgr).
		For(&bindv1alpha1.BindView{}).
		Complete(r)
}