package controller

import (
	zitadelv1alpha1 "gitea.corredorconect.com/software-engineering/zitadel-k8s-operator/api/v1alpha1"
	"gitea.corredorconect.com/software-engineering/zitadel-k8s-operator/pkg/controller/system"

	"context"
	"fmt"

	systemClient "github.com/zitadel/zitadel-go/v3/pkg/client/system"
	pb "github.com/zitadel/zitadel-go/v3/pkg/client/zitadel/system"
	"sigs.k8s.io/controller-runtime/pkg/client"
	ctrlClient "sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)

const (
	instanceFinalizerName = "instance.zitadel.github.com/instance"
)

type wrappedInstanceFinalizer struct {
	client.Client
	instance *zitadelv1alpha1.Instance
}

func newWrappedInstanceFinalizer(client client.Client, instance *zitadelv1alpha1.Instance) system.WrappedSystemFinalizer {
	return &wrappedInstanceFinalizer{
		Client:   client,
		instance: instance,
	}
}

func (wf *wrappedInstanceFinalizer) AddFinalizer(ctx context.Context) error {
	if wf.ContainsFinalizer() {
		return nil
	}
	return wf.patch(ctx, wf.instance, func(instance *zitadelv1alpha1.Instance) {
		controllerutil.AddFinalizer(instance, instanceFinalizerName)
	})
}

func (wf *wrappedInstanceFinalizer) RemoveFinalizer(ctx context.Context) error {
	if !wf.ContainsFinalizer() {
		return nil
	}
	return wf.patch(ctx, wf.instance, func(instance *zitadelv1alpha1.Instance) {
		controllerutil.RemoveFinalizer(wf.instance, instanceFinalizerName)
	})
}

func (wr *wrappedInstanceFinalizer) ContainsFinalizer() bool {
	return controllerutil.ContainsFinalizer(wr.instance, instanceFinalizerName)
}

func (wf *wrappedInstanceFinalizer) Reconcile(ctx context.Context, ztdClient *systemClient.Client) error {
	if wf.instance.Status.InstanceId != nil {
		_, err := ztdClient.RemoveInstance(ctx, &pb.RemoveInstanceRequest{InstanceId: *wf.instance.Status.InstanceId})
		if err != nil {
			return fmt.Errorf("error removing Instance: %v", err)
		}
	}
	return nil
}

func (wr *wrappedInstanceFinalizer) patch(ctx context.Context, instance *zitadelv1alpha1.Instance,
	patchFn func(*zitadelv1alpha1.Instance)) error {
	patch := ctrlClient.MergeFrom(instance.DeepCopy())
	patchFn(instance)

	if err := wr.Client.Patch(ctx, instance, patch); err != nil {
		return fmt.Errorf("error patching Instance finalizer: %v", err)
	}
	return nil
}