/*
Copyright 2015 The Kubernetes Authors All rights reserved.

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 cmd

import (
	"fmt"
	"io"

	"github.com/spf13/cobra"

	"k8s.io/kubernetes/pkg/kubectl"
	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
)

const (
	namespaceLong = `
Create a namespace with the specified name.`

	namespaceExample = `  # Create a new namespace named my-namespace
  kubectl create namespace my-namespace`
)

// NewCmdCreateNamespace is a macro command to create a new namespace
func NewCmdCreateNamespace(f *cmdutil.Factory, cmdOut io.Writer) *cobra.Command {
	cmd := &cobra.Command{
		Use:     "namespace NAME [--dry-run]",
		Aliases: []string{"ns"},
		Short:   "Create a namespace with the specified name.",
		Long:    namespaceLong,
		Example: namespaceExample,
		Run: func(cmd *cobra.Command, args []string) {
			err := CreateNamespace(f, cmdOut, cmd, args)
			cmdutil.CheckErr(err)
		},
	}
	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddPrinterFlags(cmd)
	cmdutil.AddGeneratorFlags(cmd, cmdutil.NamespaceV1GeneratorName)

	return cmd
}

// CreateNamespace implements the behavior to run the create namespace command
func CreateNamespace(f *cmdutil.Factory, cmdOut io.Writer, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)
	if err != nil {
		return err
	}
	var generator kubectl.StructuredGenerator
	switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
	case cmdutil.NamespaceV1GeneratorName:
		generator = &kubectl.NamespaceGeneratorV1{Name: name}
	default:
		return cmdutil.UsageError(cmd, fmt.Sprintf("Generator: %s not supported.", generatorName))
	}
	return RunCreateSubcommand(f, cmd, cmdOut, &CreateSubcommandOptions{
		Name:                name,
		StructuredGenerator: generator,
		DryRun:              cmdutil.GetDryRunFlag(cmd),
		OutputFormat:        cmdutil.GetFlagString(cmd, "output"),
	})
}
