// Copyright (c) 2021 Gitpod GmbH. All rights reserved.
// Licensed under the GNU Affero General Public License (AGPL).
// See License.AGPL.txt in the project root for license information.

package wsmanager

import (
	"github.com/gitpod-io/gitpod/installer/pkg/cluster"
	"github.com/gitpod-io/gitpod/installer/pkg/common"
	wsdaemon "github.com/gitpod-io/gitpod/installer/pkg/components/ws-daemon"
	"github.com/gitpod-io/gitpod/installer/pkg/config/v1"
	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/utils/pointer"
)

func deployment(ctx *common.RenderContext) ([]runtime.Object, error) {
	labels := common.CustomizeLabel(ctx, Component, common.TypeMetaDeployment)

	configHash, err := common.ObjectHash(configmap(ctx))
	if err != nil {
		return nil, err
	}

	var volumes []corev1.Volume
	var volumeMounts []corev1.VolumeMount
	if ctx.Config.Kind == config.InstallationWorkspace {
		// Image builder TLS is only enabled in workspace clusters. This check
		// can be removed once image-builder-mk3 has been removed from application clusters
		// (https://github.com/gitpod-io/gitpod/issues/7845).
		volumes = append(volumes, corev1.Volume{
			Name: common.ImageBuilderVolumeTLSCerts,
			VolumeSource: corev1.VolumeSource{
				Secret: &corev1.SecretVolumeSource{SecretName: common.ImageBuilderTLSSecret},
			},
		})
		volumeMounts = append(volumeMounts, corev1.VolumeMount{
			Name:      common.ImageBuilderVolumeTLSCerts,
			MountPath: "/image-builder-mk3-tls-certs",
			ReadOnly:  true,
		})
	}

	podSpec := corev1.PodSpec{
		PriorityClassName:  common.SystemNodeCritical,
		Affinity:           common.NodeAffinity(cluster.AffinityLabelServices),
		EnableServiceLinks: pointer.Bool(false),
		ServiceAccountName: Component,
		SecurityContext: &corev1.PodSecurityContext{
			RunAsUser: pointer.Int64(31002),
		},
		Containers: []corev1.Container{{
			Name:            Component,
			Args:            []string{"run", "--config", "/config/config.json"},
			Image:           ctx.ImageName(ctx.Config.Repository, Component, ctx.VersionManifest.Components.WSManager.Version),
			ImagePullPolicy: corev1.PullIfNotPresent,
			Resources: common.ResourceRequirements(ctx, Component, Component, corev1.ResourceRequirements{
				Requests: corev1.ResourceList{
					"cpu":    resource.MustParse("100m"),
					"memory": resource.MustParse("32Mi"),
				},
			}),
			Ports: []corev1.ContainerPort{
				{
					Name:          RPCPortName,
					ContainerPort: RPCPort,
				},
			},
			SecurityContext: &corev1.SecurityContext{
				Privileged:               pointer.Bool(false),
				AllowPrivilegeEscalation: pointer.Bool(false),
			},
			Env: common.CustomizeEnvvar(ctx, Component, common.MergeEnv(
				common.DefaultEnv(&ctx.Config),
				common.WorkspaceTracingEnv(ctx, Component),
				[]corev1.EnvVar{{Name: "GRPC_GO_RETRY", Value: "on"}},
			)),
			VolumeMounts: append(
				[]corev1.VolumeMount{
					{
						Name:      VolumeConfig,
						MountPath: "/config",
						ReadOnly:  true,
					}, {
						Name:      VolumeWorkspaceTemplate,
						MountPath: WorkspaceTemplatePath,
						ReadOnly:  true,
					}, {
						Name:      wsdaemon.VolumeTLSCerts,
						MountPath: "/ws-daemon-tls-certs",
						ReadOnly:  true,
					}, {
						Name:      VolumeTLSCerts,
						MountPath: "/certs",
						ReadOnly:  true,
					},
				},
				volumeMounts...,
			),
		},
			*common.KubeRBACProxyContainerWithConfig(ctx),
		},
		Volumes: append(
			[]corev1.Volume{
				{
					Name: VolumeConfig,
					VolumeSource: corev1.VolumeSource{
						ConfigMap: &corev1.ConfigMapVolumeSource{
							LocalObjectReference: corev1.LocalObjectReference{Name: Component},
						},
					},
				},
				{
					Name: VolumeWorkspaceTemplate,
					VolumeSource: corev1.VolumeSource{
						ConfigMap: &corev1.ConfigMapVolumeSource{
							LocalObjectReference: corev1.LocalObjectReference{Name: WorkspaceTemplateConfigMap},
						},
					},
				},
				{
					Name: wsdaemon.VolumeTLSCerts,
					VolumeSource: corev1.VolumeSource{
						Secret: &corev1.SecretVolumeSource{SecretName: wsdaemon.TLSSecretName},
					},
				},
				{
					Name: VolumeTLSCerts,
					VolumeSource: corev1.VolumeSource{
						Secret: &corev1.SecretVolumeSource{SecretName: TLSSecretNameSecret},
					},
				},
			},
			volumes...,
		),
	}

	err = common.AddStorageMounts(ctx, &podSpec, Component)
	if err != nil {
		return nil, err
	}

	if vol, mnt, _, ok := common.CustomCACertVolume(ctx); ok {
		podSpec.Volumes = append(podSpec.Volumes, *vol)
		container := podSpec.Containers[0]
		container.VolumeMounts = append(container.VolumeMounts, *mnt)
		podSpec.Containers[0] = container
	}

	return []runtime.Object{
		&appsv1.Deployment{
			TypeMeta: common.TypeMetaDeployment,
			ObjectMeta: metav1.ObjectMeta{
				Name:        Component,
				Namespace:   ctx.Namespace,
				Labels:      labels,
				Annotations: common.CustomizeAnnotation(ctx, Component, common.TypeMetaDeployment),
			},
			Spec: appsv1.DeploymentSpec{
				Selector: &metav1.LabelSelector{MatchLabels: common.DefaultLabels(Component)},
				Replicas: common.Replicas(ctx, Component),
				Strategy: common.DeploymentStrategy,
				Template: corev1.PodTemplateSpec{
					ObjectMeta: metav1.ObjectMeta{
						Name:      Component,
						Namespace: ctx.Namespace,
						Labels:    labels,
						Annotations: common.CustomizeAnnotation(ctx, Component, common.TypeMetaDeployment, func() map[string]string {
							return map[string]string{
								common.AnnotationConfigChecksum: configHash,
							}
						}),
					},
					Spec: podSpec,
				},
			},
		},
	}, nil
}