/*
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"
	"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/core"
	clientv2 "github.com/zitadel/zitadel-go/v3/pkg/client"
	"github.com/zitadel/zitadel-go/v3/pkg/client/zitadel/application/v2"
	"github.com/zitadel/zitadel-go/v3/pkg/client/zitadel/filter/v2"
	durationpb "google.golang.org/protobuf/types/known/durationpb"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/client-go/util/workqueue"
	"k8s.io/utils/ptr"
	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"
)

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

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

//+kubebuilder:rbac:groups=zitadel.topmanage.com,resources=oidcapps,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=zitadel.topmanage.com,resources=oidcapps/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=zitadel.topmanage.com,resources=oidcapps/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 *OIDCAppReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	var OIDCApp zitadelv1alpha1.OIDCApp
	if err := r.Get(ctx, req.NamespacedName, &OIDCApp); err != nil {
		return ctrl.Result{}, client.IgnoreNotFound(err)
	}
	wr := newWrappedOIDCAppReconciler(r.Client, r.RefResolver, r.Builder, &OIDCApp)
	wf := newWrappedOIDCAppFinalizer(r.Client, &OIDCApp, r.RefResolver)
	tf := core.NewCoreFinalizer(r.Client, wf)
	tr := core.NewCoreReconciler(r.Client, r.ConditionReady, wr, tf, r.RequeueInterval)

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

type wrappedOIDCAppReconciler struct {
	client.Client
	refResolver *zitadelv1alpha1.RefResolver
	OIDCApp     *zitadelv1alpha1.OIDCApp
	Builder     *builder.Builder
}

func newWrappedOIDCAppReconciler(client client.Client, refResolver *zitadelv1alpha1.RefResolver, builder *builder.Builder,
	OIDCApp *zitadelv1alpha1.OIDCApp) core.WrappedCoreReconciler {
	return &wrappedOIDCAppReconciler{
		Client:      client,
		refResolver: refResolver,
		OIDCApp:     OIDCApp,
		Builder:     builder,
	}
}

func (wr *wrappedOIDCAppReconciler) Reconcile(ctx context.Context, ztdClient *clientv2.Client) error {
	project, err := wr.OIDCApp.Project(ctx, wr.refResolver)
	if err != nil {
		return err
	}
	if project.Status.ProjectId == nil {
		return fmt.Errorf("Project has not been created yet...")
	}
	responseTypes := []application.OIDCResponseType{}
	for _, r := range wr.OIDCApp.Spec.ResponseTypes {
		responseTypes = append(responseTypes, application.OIDCResponseType(application.OIDCApplicationType_value[string(r)]))
	}
	grantTypes := []application.OIDCGrantType{}
	for _, r := range wr.OIDCApp.Spec.GrantTypes {
		grantTypes = append(grantTypes, application.OIDCGrantType(application.OIDCGrantType_value[string(r)]))
	}

	var appid *string
	var clientid *string
	appList, err := ztdClient.ApplicationServiceV2().ListApplications(ctx,
		&application.ListApplicationsRequest{
			Filters: []*application.ApplicationSearchFilter{
				{
					Filter: &application.ApplicationSearchFilter_NameFilter{
						NameFilter: &application.ApplicationNameFilter{
							Name:   wr.OIDCApp.Spec.OIDCAppName,
							Method: filter.TextFilterMethod_TEXT_FILTER_METHOD_EQUALS,
						},
					},
				},
				{
					Filter: &application.ApplicationSearchFilter_ProjectIdFilter{
						ProjectIdFilter: &application.ProjectIDFilter{
							ProjectId: *project.Status.ProjectId,
						},
					},
				},
			},
		},
	)
	if err != nil {
		return fmt.Errorf("Error listing OIDCApps: %v", err)
	}

	if len(appList.Applications) > 0 {
		appid = &appList.Applications[0].ApplicationId
		clientid = &appList.Applications[0].GetApiConfiguration().ClientId
	}

	if appid == nil {
		resp, err := ztdClient.ApplicationServiceV2().CreateApplication(ctx,
			&application.CreateApplicationRequest{
				Name:      wr.OIDCApp.Name,
				ProjectId: *project.Status.ProjectId,
				ApplicationType: &application.CreateApplicationRequest_OidcConfiguration{
					OidcConfiguration: &application.CreateOIDCApplicationRequest{
						RedirectUris:             wr.OIDCApp.Spec.RedirectUris,
						ResponseTypes:            responseTypes,
						GrantTypes:               grantTypes,
						AuthMethodType:           application.OIDCAuthMethodType(application.OIDCTokenType_value[wr.OIDCApp.Spec.AuthMethodType]),
						PostLogoutRedirectUris:   wr.OIDCApp.Spec.PostLogoutRedirectUris,
						Version:                  application.OIDCVersion_OIDC_VERSION_1_0,
						DevelopmentMode:          wr.OIDCApp.Spec.DevMode,
						AccessTokenType:          application.OIDCTokenType(application.OIDCTokenType_value[wr.OIDCApp.Spec.AccessTokenType]),
						AccessTokenRoleAssertion: wr.OIDCApp.Spec.AccessTokenRoleAssertion,
						IdTokenRoleAssertion:     wr.OIDCApp.Spec.IdTokenRoleAssertion,
						IdTokenUserinfoAssertion: wr.OIDCApp.Spec.IdTokenUserinfoAssertion,
						ClockSkew:                durationpb.New(wr.OIDCApp.Spec.ClockSkew.Duration),
						AdditionalOrigins:        wr.OIDCApp.Spec.AdditionalOrigins,
						SkipNativeAppSuccessPage: wr.OIDCApp.Spec.SkipNativeAppSuccessPage,
						LoginVersion: &application.LoginVersion{
							Version: &application.LoginVersion_LoginV2{
								LoginV2: &application.LoginV2{
									BaseUri: nil,
								},
							},
						},
						BackChannelLogoutUri: wr.OIDCApp.Spec.BackChannelLogoutUri,
					},
				},
			},
		)
		if err != nil {
			return fmt.Errorf("error creating OIDCApp in Zitadel: %v", err)
		}
		key := types.NamespacedName{
			Name:      wr.OIDCApp.ClientSecretName(),
			Namespace: wr.OIDCApp.Namespace,
		}

		secretData := map[string][]byte{"clientSecret": []byte(resp.GetApiConfiguration().ClientSecret), "appId": []byte(resp.ApplicationId), "clientId": []byte(resp.GetApiConfiguration().ClientId)}
		secret, err := wr.Builder.BuildSecret(builder.SecretOpts{Immutable: false, Zitadel: nil, Key: key, Data: secretData}, wr.OIDCApp)
		if err != nil {
			return fmt.Errorf("error building Secret: %v", err)
		}
		if err := wr.Create(ctx, secret); err != nil {
			return fmt.Errorf("error creating Client-secret Secret: %v", err)
		}
		appid = &resp.ApplicationId
		clientid = &resp.GetApiConfiguration().ClientId
	} else {
		_, err := ztdClient.ApplicationServiceV2().UpdateApplication(ctx,
			&application.UpdateApplicationRequest{
				Name:      wr.OIDCApp.Name,
				ProjectId: *project.Status.ProjectId,
				ApplicationType: &application.UpdateApplicationRequest_OidcConfiguration{
					OidcConfiguration: &application.UpdateOIDCApplicationConfigurationRequest{
						RedirectUris:             wr.OIDCApp.Spec.RedirectUris,
						ResponseTypes:            responseTypes,
						GrantTypes:               grantTypes,
						AuthMethodType:           ptr.To(application.OIDCAuthMethodType(application.OIDCTokenType_value[wr.OIDCApp.Spec.AuthMethodType])),
						PostLogoutRedirectUris:   wr.OIDCApp.Spec.PostLogoutRedirectUris,
						Version:                  ptr.To(application.OIDCVersion_OIDC_VERSION_1_0),
						DevelopmentMode:          &wr.OIDCApp.Spec.DevMode,
						AccessTokenType:          ptr.To(application.OIDCTokenType(application.OIDCTokenType_value[wr.OIDCApp.Spec.AccessTokenType])),
						AccessTokenRoleAssertion: &wr.OIDCApp.Spec.AccessTokenRoleAssertion,
						IdTokenRoleAssertion:     &wr.OIDCApp.Spec.IdTokenRoleAssertion,
						IdTokenUserinfoAssertion: &wr.OIDCApp.Spec.IdTokenUserinfoAssertion,
						ClockSkew:                durationpb.New(wr.OIDCApp.Spec.ClockSkew.Duration),
						AdditionalOrigins:        wr.OIDCApp.Spec.AdditionalOrigins,
						SkipNativeAppSuccessPage: &wr.OIDCApp.Spec.SkipNativeAppSuccessPage,
						LoginVersion: &application.LoginVersion{
							Version: &application.LoginVersion_LoginV2{
								LoginV2: &application.LoginV2{
									BaseUri: nil,
								},
							},
						},
						BackChannelLogoutUri: &wr.OIDCApp.Spec.BackChannelLogoutUri,
					},
				},
			},
		)
		if err != nil {
			return fmt.Errorf("error updating OIDCApp in Zitadel: %v", err)
		}
	}
	patch := ctrlClient.MergeFrom(wr.OIDCApp.DeepCopy())
	wr.OIDCApp.Status.AppId = appid
	wr.OIDCApp.Status.ClientId = clientid
	return wr.Client.Status().Patch(ctx, wr.OIDCApp, patch)
}

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

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

// SetupWithManager sets up the controller with the Manager.
func (r *OIDCAppReconciler) SetupWithManager(mgr ctrl.Manager) error {
	return ctrl.NewControllerManagedBy(mgr).
		For(&zitadelv1alpha1.OIDCApp{}).
		Owns(&corev1.Secret{}).
		WithOptions(controller.Options{RateLimiter: workqueue.NewTypedItemExponentialFailureRateLimiter[reconcile.Request](time.Millisecond*500, time.Minute*3)}).
		Complete(r)
}