/*
Copyright 2024.

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"
	"strings"
	"time"

	zitadelv1alpha1 "github.com/HaimKortovich/zitadel-k8s-operator/api/v1alpha1"
	"github.com/HaimKortovich/zitadel-k8s-operator/pkg/builder"
	condition "github.com/HaimKortovich/zitadel-k8s-operator/pkg/condition"
	"github.com/HaimKortovich/zitadel-k8s-operator/pkg/controller/zitadel"
	"github.com/zitadel/zitadel-go/v3/pkg/client/management"
	"github.com/zitadel/zitadel-go/v3/pkg/client/middleware"
	pb "github.com/zitadel/zitadel-go/v3/pkg/client/zitadel/management"
	durationpb "google.golang.org/protobuf/types/known/durationpb"
	"k8s.io/client-go/util/workqueue"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	ctrlClient "sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/reconcile"
)

// ActionReconciler reconciles a Action object
type ActionReconciler struct {
	client.Client
	RefResolver     *zitadelv1alpha1.RefResolver
	ConditionReady  *condition.Ready
	RequeueInterval time.Duration
	Builder         *builder.Builder
}

func NewActionReconciler(client client.Client, refResolver *zitadelv1alpha1.RefResolver, builder *builder.Builder, conditionReady *condition.Ready,
	requeueInterval time.Duration) *ActionReconciler {
	return &ActionReconciler{
		Client:          client,
		RefResolver:     refResolver,
		ConditionReady:  conditionReady,
		RequeueInterval: requeueInterval,
		Builder:         builder,
	}
}

//+kubebuilder:rbac:groups=zitadel.topmanage.com,resources=actions,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=zitadel.topmanage.com,resources=actions/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=zitadel.topmanage.com,resources=actions/finalizers,verbs=update

// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
func (r *ActionReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	var Action zitadelv1alpha1.Action
	if err := r.Get(ctx, req.NamespacedName, &Action); err != nil {
		return ctrl.Result{}, client.IgnoreNotFound(err)
	}
	wr := newWrappedActionReconciler(r.Client, r.RefResolver, r.Builder, &Action)
	wf := newWrappedActionFinalizer(r.Client, &Action, r.RefResolver)
	tf := zitadel.NewZitadelFinalizer(r.Client, wf)
	tr := zitadel.NewZitadelReconciler(r.Client, r.ConditionReady, wr, tf, r.RequeueInterval)

	result, err := tr.Reconcile(ctx, &Action)
	if err != nil {
		return result, fmt.Errorf("error reconciling in ActionReconciler: %v", err)
	}
	return result, nil
}

type wrappedActionReconciler struct {
	client.Client
	refResolver *zitadelv1alpha1.RefResolver
	Action      *zitadelv1alpha1.Action
	Builder     *builder.Builder
}

func newWrappedActionReconciler(client client.Client, refResolver *zitadelv1alpha1.RefResolver, builder *builder.Builder,
	Action *zitadelv1alpha1.Action) zitadel.WrappedReconciler {
	return &wrappedActionReconciler{
		Client:      client,
		refResolver: refResolver,
		Action:      Action,
		Builder:     builder,
	}
}

type actionReoncilePhase struct {
	Name      string
	Reconcile func(context.Context, *management.Client) error
}

func (wr *wrappedActionReconciler) Reconcile(ctx context.Context, ztdClient *management.Client) error {
	phases := []actionReoncilePhase{
		{
			Name:      "action",
			Reconcile: wr.reconcileAction,
		},
	}
	for _, p := range phases {
		err := p.Reconcile(ctx, ztdClient)
		if err != nil {
			return err
		}
	}
	return nil
}

func (wr *wrappedActionReconciler) reconcileAction(ctx context.Context, ztdClient *management.Client) error {
	org, err := wr.refResolver.OrganizationRef(ctx, &wr.Action.Spec.OrganizationRef, wr.Action.Namespace)
	if err != nil {
		return err
	}
	ctx = middleware.SetOrgID(ctx, org.Status.OrgId)

	if wr.Action.Status.ActionId != "" {
		p, err := ztdClient.GetAction(ctx, &pb.GetActionRequest{Id: wr.Action.Status.ActionId})
		if p != nil {
			_, err := ztdClient.UpdateAction(ctx,
				&pb.UpdateActionRequest{
					Id:            p.Action.Id,
					Name:          wr.Action.Name,
					Script:        wr.Action.Spec.Script,
					Timeout:       durationpb.New(wr.Action.Spec.Timeout.Duration),
					AllowedToFail: wr.Action.Spec.AllowedToFail,
				},
			)

			if err != nil {
				if !strings.Contains(err.Error(), "No changes") {
					return fmt.Errorf("Error updating Action: %v", err)
				}
			}
			return nil
		}
		if err != nil {
			if !strings.Contains(err.Error(), "not found") {
				return fmt.Errorf("Error getting Action: %v", err)
			}
		}
	}

	resp, err := ztdClient.CreateAction(ctx,
		&pb.CreateActionRequest{
			Name:          wr.Action.Name,
			Script:        wr.Action.Spec.Script,
			Timeout:       durationpb.New(wr.Action.Spec.Timeout.Duration),
			AllowedToFail: wr.Action.Spec.AllowedToFail,
		},
	)

	if err != nil {
		if strings.Contains(err.Error(), "AlreadyExists") {
			return nil
		}
		return fmt.Errorf("error creating action in Zitadel: %v", err)
	}
	patch := ctrlClient.MergeFrom(wr.Action.DeepCopy())
	wr.Action.Status.ActionId = resp.Id
	return wr.Client.Status().Patch(ctx, wr.Action, patch)
}

func (wr *wrappedActionReconciler) PatchStatus(ctx context.Context, patcher condition.Patcher) error {
	patch := client.MergeFrom(wr.Action.DeepCopy())
	patcher(&wr.Action.Status)

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

// SetupWithManager sets up the controller with the Manager.
func (r *ActionReconciler) SetupWithManager(mgr ctrl.Manager) error {
	return ctrl.NewControllerManagedBy(mgr).
		For(&zitadelv1alpha1.Action{}).
		WithOptions(controller.Options{RateLimiter: workqueue.NewTypedItemExponentialFailureRateLimiter[reconcile.Request](time.Millisecond*500, time.Minute*3)}).
		Complete(r)
}