// 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 cluster

import (
	"fmt"

	"github.com/gitpod-io/gitpod/installer/pkg/common"
	"github.com/gitpod-io/gitpod/installer/pkg/config/v1/experimental"
	v1 "k8s.io/api/rbac/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
)

func clusterrole(ctx *common.RenderContext) ([]runtime.Object, error) {
	resources := []runtime.Object{
		&v1.ClusterRole{
			TypeMeta: common.TypeMetaClusterRole,
			ObjectMeta: metav1.ObjectMeta{
				Name: fmt.Sprintf("%s-kube-rbac-proxy", ctx.Namespace),
			},
			Rules: []v1.PolicyRule{
				{
					APIGroups: []string{"authentication.k8s.io"},
					Resources: []string{"tokenreviews"},
					Verbs:     []string{"create"},
				},
				{
					APIGroups: []string{"authorization.k8s.io"},
					Resources: []string{"subjectaccessreviews"},
					Verbs:     []string{"create"},
				},
			},
		},
	}

	_ = ctx.WithExperimental(func(cfg *experimental.Config) error {
		if cfg.Common != nil && cfg.Common.UsePodSecurityPolicies {
			resources = append(resources,
				&v1.ClusterRole{
					TypeMeta: common.TypeMetaClusterRole,
					ObjectMeta: metav1.ObjectMeta{
						Name: fmt.Sprintf("%s-ns-psp:privileged", ctx.Namespace),
					},
					Rules: []v1.PolicyRule{
						{
							APIGroups:     []string{"policy"},
							Resources:     []string{"podsecuritypolicies"},
							Verbs:         []string{"use"},
							ResourceNames: []string{fmt.Sprintf("%s-ns-privileged", ctx.Namespace)},
						},
					},
				},
				&v1.ClusterRole{
					TypeMeta: common.TypeMetaClusterRole,
					ObjectMeta: metav1.ObjectMeta{
						Name: fmt.Sprintf("%s-ns-psp:restricted-root-user", ctx.Namespace),
					},
					Rules: []v1.PolicyRule{
						{
							APIGroups:     []string{"policy"},
							Resources:     []string{"podsecuritypolicies"},
							Verbs:         []string{"use"},
							ResourceNames: []string{fmt.Sprintf("%s-ns-restricted-root-user", ctx.Namespace)},
						},
					},
				},
				&v1.ClusterRole{
					TypeMeta: common.TypeMetaClusterRole,
					ObjectMeta: metav1.ObjectMeta{
						Name: fmt.Sprintf("%s-ns-psp:unprivileged", ctx.Namespace),
					},
					Rules: []v1.PolicyRule{
						{
							APIGroups:     []string{"policy"},
							Resources:     []string{"podsecuritypolicies"},
							Verbs:         []string{"use"},
							ResourceNames: []string{fmt.Sprintf("%s-ns-unprivileged", ctx.Namespace)},
						},
					},
				},
			)
		}
		return nil
	})

	return resources, nil
}