// newReadOnlyCacheAndClient returns a ReadOnlyCache for administrative interactions with the cache holding policies and bindings on a project
// and cluster level as well as a ReadOnlyPolicyClient for use in the project authorization cache and authorizer to query for the same data
func newReadOnlyCacheAndClient(etcdHelper tools.EtcdHelper) (cache policycache.ReadOnlyCache, client policyclient.ReadOnlyPolicyClient) {
	policyRegistry := policyregistry.NewRegistry(policyetcd.NewStorage(etcdHelper))
	policyBindingRegistry := policybindingregistry.NewRegistry(policybindingetcd.NewStorage(etcdHelper))
	clusterPolicyRegistry := clusterpolicyregistry.NewRegistry(clusterpolicyetcd.NewStorage(etcdHelper))
	clusterPolicyBindingRegistry := clusterpolicybindingregistry.NewRegistry(clusterpolicybindingetcd.NewStorage(etcdHelper))

	cache, client = policycache.NewReadOnlyCacheAndClient(policyBindingRegistry, policyRegistry, clusterPolicyBindingRegistry, clusterPolicyRegistry)
	return
}
func OverwriteBootstrapPolicy(etcdHelper tools.EtcdHelper, policyFile, createBootstrapPolicyCommand string, change bool, out io.Writer) error {
	if !change {
		fmt.Fprintf(out, "Performing a dry run of policy overwrite:\n\n")
	}

	mapper := cmdclientcmd.ShortcutExpander{kubectl.ShortcutExpander{latest.RESTMapper}}
	typer := kapi.Scheme
	clientMapper := resource.ClientMapperFunc(func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
		return nil, nil
	})

	r := resource.NewBuilder(mapper, typer, clientMapper).
		FilenameParam(policyFile).
		Flatten().
		Do()

	if r.Err() != nil {
		return r.Err()
	}

	policyRegistry := policyregistry.NewRegistry(policyetcd.NewStorage(etcdHelper))
	policyBindingRegistry := policybindingregistry.NewRegistry(policybindingetcd.NewStorage(etcdHelper))

	clusterPolicyRegistry := clusterpolicyregistry.NewRegistry(clusterpolicyetcd.NewStorage(etcdHelper))
	clusterPolicyBindingRegistry := clusterpolicybindingregistry.NewRegistry(clusterpolicybindingetcd.NewStorage(etcdHelper))

	roleRegistry := roleregistry.NewRegistry(rolestorage.NewVirtualStorage(policyRegistry))
	roleBindingStorage := rolebindingstorage.NewVirtualStorage(policyRegistry, policyBindingRegistry, clusterPolicyRegistry, clusterPolicyBindingRegistry)
	clusterRoleStorage := clusterrolestorage.NewClusterRoleStorage(clusterPolicyRegistry)
	clusterRoleRegistry := clusterroleregistry.NewRegistry(clusterRoleStorage)
	clusterRoleBindingStorage := clusterrolebindingstorage.NewClusterRoleBindingStorage(clusterPolicyRegistry, clusterPolicyBindingRegistry)

	return r.Visit(func(info *resource.Info) error {
		template, ok := info.Object.(*templateapi.Template)
		if !ok {
			return errors.New("policy must be contained in a template.  One can be created with '" + createBootstrapPolicyCommand + "'.")
		}
		runtime.DecodeList(template.Objects, kapi.Scheme)

		for _, item := range template.Objects {
			switch t := item.(type) {
			case *authorizationapi.Role:
				ctx := kapi.WithNamespace(kapi.NewContext(), t.Namespace)
				if change {
					roleRegistry.DeleteRole(ctx, t.Name)
					if _, err := roleRegistry.CreateRole(ctx, t); err != nil {
						return err
					}
				} else {
					fmt.Fprintf(out, "Overwrite role %s/%s\n", t.Namespace, t.Name)
					if s, err := describe.DescribeRole(t); err == nil {
						fmt.Fprintf(out, "%s\n", s)
					}
				}
			case *authorizationapi.RoleBinding:
				ctx := kapi.WithNamespace(kapi.NewContext(), t.Namespace)
				if change {
					roleBindingStorage.Delete(ctx, t.Name, nil)
					if _, err := roleBindingStorage.CreateRoleBindingWithEscalation(ctx, t); err != nil {
						return err
					}
				} else {
					fmt.Fprintf(out, "Overwrite role binding %s/%s\n", t.Namespace, t.Name)
					if s, err := describe.DescribeRoleBinding(t, nil, nil); err == nil {
						fmt.Fprintf(out, "%s\n", s)
					}
				}

			case *authorizationapi.ClusterRole:
				ctx := kapi.WithNamespace(kapi.NewContext(), t.Namespace)
				if change {
					clusterRoleRegistry.DeleteClusterRole(ctx, t.Name)
					if _, err := clusterRoleRegistry.CreateClusterRole(ctx, t); err != nil {
						return err
					}
				} else {
					fmt.Fprintf(out, "Overwrite role %s/%s\n", t.Namespace, t.Name)
					if s, err := describe.DescribeRole(authorizationapi.ToRole(t)); err == nil {
						fmt.Fprintf(out, "%s\n", s)
					}
				}
			case *authorizationapi.ClusterRoleBinding:
				ctx := kapi.WithNamespace(kapi.NewContext(), t.Namespace)
				if change {
					clusterRoleBindingStorage.Delete(ctx, t.Name, nil)
					if _, err := clusterRoleBindingStorage.CreateClusterRoleBindingWithEscalation(ctx, t); err != nil {
						return err
					}
				} else {
					fmt.Fprintf(out, "Overwrite role binding %s/%s\n", t.Namespace, t.Name)
					if s, err := describe.DescribeRoleBinding(authorizationapi.ToRoleBinding(t), nil, nil); err == nil {
						fmt.Fprintf(out, "%s\n", s)
					}
				}

			default:
				return errors.New("only roles and rolebindings may be created in this mode")
			}
		}
		if !change {
			fmt.Fprintf(out, "To make the changes described above, pass --force\n")
		}
		return nil
	})
}