/*
Copyright 2023.

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 controllers

import (
	"context"
	"time"

	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/log"

	formolv1alpha1 "github.com/desmo999r/formol/api/v1alpha1"
)

// RestoreSessionReconciler reconciles a RestoreSession object
type RestoreSessionReconciler struct {
	Session
}

//+kubebuilder:rbac:groups=formol.desmojim.fr,resources=restoresessions,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=formol.desmojim.fr,resources=restoresessions/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=formol.desmojim.fr,resources=restoresessions/finalizers,verbs=update

func (r *RestoreSessionReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	r.Log = log.FromContext(ctx)
	r.Context = ctx

	restoreSession := formolv1alpha1.RestoreSession{}
	err := r.Get(r.Context, req.NamespacedName, &restoreSession)
	if err != nil {
		if errors.IsNotFound(err) {
			return ctrl.Result{}, nil
		}
		return ctrl.Result{}, err
	}
	backupSession := formolv1alpha1.BackupSession{
		Spec:   restoreSession.Spec.BackupSessionRef.Spec,
		Status: restoreSession.Spec.BackupSessionRef.Status,
	}
	backupConf := formolv1alpha1.BackupConfiguration{}
	if err := r.Get(r.Context, client.ObjectKey{
		Namespace: backupSession.Spec.Ref.Namespace,
		Name:      backupSession.Spec.Ref.Name,
	}, &restoreSession); err != nil {
		r.Log.Error(err, "unable to get BackupConfiguration")
		return ctrl.Result{}, err
	}
	var newSessionState formolv1alpha1.SessionState
	switch restoreSession.Status.SessionState {
	case formolv1alpha1.New:
		newSessionState = r.initRestore(&restoreSession, backupConf)
	case "":
		newSessionState = formolv1alpha1.New
		restoreSession.Status.StartTime = &metav1.Time{Time: time.Now()}
	}
	if newSessionState != "" {
		r.Log.V(0).Info("Restore session needs a status update", "newSessionState", newSessionState, "RestoreSession", restoreSession)
		restoreSession.Status.SessionState = newSessionState
		if err := r.Status().Update(r.Context, &restoreSession); err != nil {
			r.Log.Error(err, "unable to update RestoreSession.Status")
			return ctrl.Result{}, err
		}
	}
	return ctrl.Result{}, nil
}

// SetupWithManager sets up the controller with the Manager.
func (r *RestoreSessionReconciler) SetupWithManager(mgr ctrl.Manager) error {
	return ctrl.NewControllerManagedBy(mgr).
		For(&formolv1alpha1.RestoreSession{}).
		Complete(r)
}