/*
Copyright 2014 The Kubernetes Authors.

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"
	"net/http"
	"os"
	"os/exec"
	"runtime"
	"strings"
	"syscall"

	"github.com/spf13/cobra"

	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
	cliflag "k8s.io/component-base/cli/flag"
	"k8s.io/klog/v2"
	"k8s.io/kubectl/pkg/cmd/annotate"
	"k8s.io/kubectl/pkg/cmd/apiresources"
	"k8s.io/kubectl/pkg/cmd/apply"
	"k8s.io/kubectl/pkg/cmd/attach"
	"k8s.io/kubectl/pkg/cmd/auth"
	"k8s.io/kubectl/pkg/cmd/autoscale"
	"k8s.io/kubectl/pkg/cmd/certificates"
	"k8s.io/kubectl/pkg/cmd/clusterinfo"
	"k8s.io/kubectl/pkg/cmd/completion"
	cmdconfig "k8s.io/kubectl/pkg/cmd/config"
	"k8s.io/kubectl/pkg/cmd/cp"
	"k8s.io/kubectl/pkg/cmd/create"
	"k8s.io/kubectl/pkg/cmd/debug"
	"k8s.io/kubectl/pkg/cmd/delete"
	"k8s.io/kubectl/pkg/cmd/describe"
	"k8s.io/kubectl/pkg/cmd/diff"
	"k8s.io/kubectl/pkg/cmd/drain"
	"k8s.io/kubectl/pkg/cmd/edit"
	cmdexec "k8s.io/kubectl/pkg/cmd/exec"
	"k8s.io/kubectl/pkg/cmd/explain"
	"k8s.io/kubectl/pkg/cmd/expose"
	"k8s.io/kubectl/pkg/cmd/get"
	"k8s.io/kubectl/pkg/cmd/label"
	"k8s.io/kubectl/pkg/cmd/logs"
	"k8s.io/kubectl/pkg/cmd/options"
	"k8s.io/kubectl/pkg/cmd/patch"
	"k8s.io/kubectl/pkg/cmd/plugin"
	"k8s.io/kubectl/pkg/cmd/portforward"
	"k8s.io/kubectl/pkg/cmd/proxy"
	"k8s.io/kubectl/pkg/cmd/replace"
	"k8s.io/kubectl/pkg/cmd/rollout"
	"k8s.io/kubectl/pkg/cmd/run"
	"k8s.io/kubectl/pkg/cmd/scale"
	"k8s.io/kubectl/pkg/cmd/set"
	"k8s.io/kubectl/pkg/cmd/taint"
	"k8s.io/kubectl/pkg/cmd/top"
	cmdutil "k8s.io/kubectl/pkg/cmd/util"
	"k8s.io/kubectl/pkg/cmd/version"
	"k8s.io/kubectl/pkg/cmd/wait"
	utilcomp "k8s.io/kubectl/pkg/util/completion"
	"k8s.io/kubectl/pkg/util/i18n"
	"k8s.io/kubectl/pkg/util/templates"
	"k8s.io/kubectl/pkg/util/term"

	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/kubectl/pkg/cmd/kustomize"
)

const kubectlCmdHeaders = "KUBECTL_COMMAND_HEADERS"

type KubectlOptions struct {
	PluginHandler PluginHandler
	Arguments     []string
	ConfigFlags   *genericclioptions.ConfigFlags

	genericclioptions.IOStreams
}

var defaultConfigFlags = genericclioptions.NewConfigFlags(true).WithDeprecatedPasswordFlag().WithDiscoveryBurst(300).WithDiscoveryQPS(50.0)

// NewDefaultKubectlCommand creates the `kubectl` command with default arguments
func NewDefaultKubectlCommand() *cobra.Command {
	return NewDefaultKubectlCommandWithArgs(KubectlOptions{
		PluginHandler: NewDefaultPluginHandler(plugin.ValidPluginFilenamePrefixes),
		Arguments:     os.Args,
		ConfigFlags:   defaultConfigFlags,
		IOStreams:     genericclioptions.IOStreams{In: os.Stdin, Out: os.Stdout, ErrOut: os.Stderr},
	})
}

// NewDefaultKubectlCommandWithArgs creates the `kubectl` command with arguments
func NewDefaultKubectlCommandWithArgs(o KubectlOptions) *cobra.Command {
	cmd := NewKubectlCommand(o)

	if o.PluginHandler == nil {
		return cmd
	}

	if len(o.Arguments) > 1 {
		cmdPathPieces := o.Arguments[1:]

		// only look for suitable extension executables if
		// the specified command does not already exist
		if _, _, err := cmd.Find(cmdPathPieces); err != nil {
			// Also check the commands that will be added by Cobra.
			// These commands are only added once rootCmd.Execute() is called, so we
			// need to check them explicitly here.
			var cmdName string // first "non-flag" arguments
			for _, arg := range cmdPathPieces {
				if !strings.HasPrefix(arg, "-") {
					cmdName = arg
					break
				}
			}

			switch cmdName {
			case "help", cobra.ShellCompRequestCmd, cobra.ShellCompNoDescRequestCmd:
				// Don't search for a plugin
			default:
				if err := HandlePluginCommand(o.PluginHandler, cmdPathPieces); err != nil {
					fmt.Fprintf(o.IOStreams.ErrOut, "Error: %v\n", err)
					os.Exit(1)
				}
			}
		}
	}

	return cmd
}

// PluginHandler is capable of parsing command line arguments
// and performing executable filename lookups to search
// for valid plugin files, and execute found plugins.
type PluginHandler interface {
	// exists at the given filename, or a boolean false.
	// Lookup will iterate over a list of given prefixes
	// in order to recognize valid plugin filenames.
	// The first filepath to match a prefix is returned.
	Lookup(filename string) (string, bool)
	// Execute receives an executable's filepath, a slice
	// of arguments, and a slice of environment variables
	// to relay to the executable.
	Execute(executablePath string, cmdArgs, environment []string) error
}

// DefaultPluginHandler implements PluginHandler
type DefaultPluginHandler struct {
	ValidPrefixes []string
}

// NewDefaultPluginHandler instantiates the DefaultPluginHandler with a list of
// given filename prefixes used to identify valid plugin filenames.
func NewDefaultPluginHandler(validPrefixes []string) *DefaultPluginHandler {
	return &DefaultPluginHandler{
		ValidPrefixes: validPrefixes,
	}
}

// Lookup implements PluginHandler
func (h *DefaultPluginHandler) Lookup(filename string) (string, bool) {
	for _, prefix := range h.ValidPrefixes {
		path, err := exec.LookPath(fmt.Sprintf("%s-%s", prefix, filename))
		if err != nil || len(path) == 0 {
			continue
		}
		return path, true
	}

	return "", false
}

// Execute implements PluginHandler
func (h *DefaultPluginHandler) Execute(executablePath string, cmdArgs, environment []string) error {

	// Windows does not support exec syscall.
	if runtime.GOOS == "windows" {
		cmd := exec.Command(executablePath, cmdArgs...)
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		cmd.Stdin = os.Stdin
		cmd.Env = environment
		err := cmd.Run()
		if err == nil {
			os.Exit(0)
		}
		return err
	}

	// invoke cmd binary relaying the environment and args given
	// append executablePath to cmdArgs, as execve will make first argument the "binary name".
	return syscall.Exec(executablePath, append([]string{executablePath}, cmdArgs...), environment)
}

// HandlePluginCommand receives a pluginHandler and command-line arguments and attempts to find
// a plugin executable on the PATH that satisfies the given arguments.
func HandlePluginCommand(pluginHandler PluginHandler, cmdArgs []string) error {
	var remainingArgs []string // all "non-flag" arguments
	for _, arg := range cmdArgs {
		if strings.HasPrefix(arg, "-") {
			break
		}
		remainingArgs = append(remainingArgs, strings.Replace(arg, "-", "_", -1))
	}

	if len(remainingArgs) == 0 {
		// the length of cmdArgs is at least 1
		return fmt.Errorf("flags cannot be placed before plugin name: %s", cmdArgs[0])
	}

	foundBinaryPath := ""

	// attempt to find binary, starting at longest possible name with given cmdArgs
	for len(remainingArgs) > 0 {
		path, found := pluginHandler.Lookup(strings.Join(remainingArgs, "-"))
		if !found {
			remainingArgs = remainingArgs[:len(remainingArgs)-1]
			continue
		}

		foundBinaryPath = path
		break
	}

	if len(foundBinaryPath) == 0 {
		return nil
	}

	// invoke cmd binary relaying the current environment and args given
	if err := pluginHandler.Execute(foundBinaryPath, cmdArgs[len(remainingArgs):], os.Environ()); err != nil {
		return err
	}

	return nil
}

// NewKubectlCommand creates the `kubectl` command and its nested children.
func NewKubectlCommand(o KubectlOptions) *cobra.Command {
	warningHandler := rest.NewWarningWriter(o.IOStreams.ErrOut, rest.WarningWriterOptions{Deduplicate: true, Color: term.AllowsColorOutput(o.IOStreams.ErrOut)})
	warningsAsErrors := false
	// Parent command to which all subcommands are added.
	cmds := &cobra.Command{
		Use:   "kubectl",
		Short: i18n.T("kubectl controls the Kubernetes cluster manager"),
		Long: templates.LongDesc(`
      kubectl controls the Kubernetes cluster manager.

      Find more information at:
            https://kubernetes.io/docs/reference/kubectl/`),
		Run: runHelp,
		// Hook before and after Run initialize and write profiles to disk,
		// respectively.
		PersistentPreRunE: func(*cobra.Command, []string) error {
			rest.SetDefaultWarningHandler(warningHandler)
			return initProfiling()
		},
		PersistentPostRunE: func(*cobra.Command, []string) error {
			if err := flushProfiling(); err != nil {
				return err
			}
			if warningsAsErrors {
				count := warningHandler.WarningCount()
				switch count {
				case 0:
					// no warnings
				case 1:
					return fmt.Errorf("%d warning received", count)
				default:
					return fmt.Errorf("%d warnings received", count)
				}
			}
			return nil
		},
	}
	// From this point and forward we get warnings on flags that contain "_" separators
	// when adding them with hyphen instead of the original name.
	cmds.SetGlobalNormalizationFunc(cliflag.WarnWordSepNormalizeFunc)

	flags := cmds.PersistentFlags()

	addProfilingFlags(flags)

	flags.BoolVar(&warningsAsErrors, "warnings-as-errors", warningsAsErrors, "Treat warnings received from the server as errors and exit with a non-zero exit code")

	kubeConfigFlags := o.ConfigFlags
	if kubeConfigFlags == nil {
		kubeConfigFlags = defaultConfigFlags
	}
	kubeConfigFlags.AddFlags(flags)
	matchVersionKubeConfigFlags := cmdutil.NewMatchVersionFlags(kubeConfigFlags)
	matchVersionKubeConfigFlags.AddFlags(flags)
	// Updates hooks to add kubectl command headers: SIG CLI KEP 859.
	addCmdHeaderHooks(cmds, kubeConfigFlags)

	f := cmdutil.NewFactory(matchVersionKubeConfigFlags)

	// Sending in 'nil' for the getLanguageFn() results in using
	// the LANG environment variable.
	//
	// TODO: Consider adding a flag or file preference for setting
	// the language, instead of just loading from the LANG env. variable.
	i18n.LoadTranslations("kubectl", nil)

	// Proxy command is incompatible with CommandHeaderRoundTripper, so
	// clear the WrapConfigFn before running proxy command.
	proxyCmd := proxy.NewCmdProxy(f, o.IOStreams)
	proxyCmd.PreRun = func(cmd *cobra.Command, args []string) {
		kubeConfigFlags.WrapConfigFn = nil
	}

	// Avoid import cycle by setting ValidArgsFunction here instead of in NewCmdGet()
	getCmd := get.NewCmdGet("kubectl", f, o.IOStreams)
	getCmd.ValidArgsFunction = utilcomp.ResourceTypeAndNameCompletionFunc(f)

	groups := templates.CommandGroups{
		{
			Message: "Basic Commands (Beginner):",
			Commands: []*cobra.Command{
				create.NewCmdCreate(f, o.IOStreams),
				expose.NewCmdExposeService(f, o.IOStreams),
				run.NewCmdRun(f, o.IOStreams),
				set.NewCmdSet(f, o.IOStreams),
			},
		},
		{
			Message: "Basic Commands (Intermediate):",
			Commands: []*cobra.Command{
				explain.NewCmdExplain("kubectl", f, o.IOStreams),
				getCmd,
				edit.NewCmdEdit(f, o.IOStreams),
				delete.NewCmdDelete(f, o.IOStreams),
			},
		},
		{
			Message: "Deploy Commands:",
			Commands: []*cobra.Command{
				rollout.NewCmdRollout(f, o.IOStreams),
				scale.NewCmdScale(f, o.IOStreams),
				autoscale.NewCmdAutoscale(f, o.IOStreams),
			},
		},
		{
			Message: "Cluster Management Commands:",
			Commands: []*cobra.Command{
				certificates.NewCmdCertificate(f, o.IOStreams),
				clusterinfo.NewCmdClusterInfo(f, o.IOStreams),
				top.NewCmdTop(f, o.IOStreams),
				drain.NewCmdCordon(f, o.IOStreams),
				drain.NewCmdUncordon(f, o.IOStreams),
				drain.NewCmdDrain(f, o.IOStreams),
				taint.NewCmdTaint(f, o.IOStreams),
			},
		},
		{
			Message: "Troubleshooting and Debugging Commands:",
			Commands: []*cobra.Command{
				describe.NewCmdDescribe("kubectl", f, o.IOStreams),
				logs.NewCmdLogs(f, o.IOStreams),
				attach.NewCmdAttach(f, o.IOStreams),
				cmdexec.NewCmdExec(f, o.IOStreams),
				portforward.NewCmdPortForward(f, o.IOStreams),
				proxyCmd,
				cp.NewCmdCp(f, o.IOStreams),
				auth.NewCmdAuth(f, o.IOStreams),
				debug.NewCmdDebug(f, o.IOStreams),
			},
		},
		{
			Message: "Advanced Commands:",
			Commands: []*cobra.Command{
				diff.NewCmdDiff(f, o.IOStreams),
				apply.NewCmdApply("kubectl", f, o.IOStreams),
				patch.NewCmdPatch(f, o.IOStreams),
				replace.NewCmdReplace(f, o.IOStreams),
				wait.NewCmdWait(f, o.IOStreams),
				kustomize.NewCmdKustomize(o.IOStreams),
			},
		},
		{
			Message: "Settings Commands:",
			Commands: []*cobra.Command{
				label.NewCmdLabel(f, o.IOStreams),
				annotate.NewCmdAnnotate("kubectl", f, o.IOStreams),
				completion.NewCmdCompletion(o.IOStreams.Out, ""),
			},
		},
	}
	groups.Add(cmds)

	filters := []string{"options"}

	// Hide the "alpha" subcommand if there are no alpha commands in this build.
	alpha := NewCmdAlpha(f, o.IOStreams)
	if !alpha.HasSubCommands() {
		filters = append(filters, alpha.Name())
	}

	templates.ActsAsRootCommand(cmds, filters, groups...)

	utilcomp.SetFactoryForCompletion(f)
	registerCompletionFuncForGlobalFlags(cmds, f)

	cmds.AddCommand(alpha)
	cmds.AddCommand(cmdconfig.NewCmdConfig(clientcmd.NewDefaultPathOptions(), o.IOStreams))
	cmds.AddCommand(plugin.NewCmdPlugin(o.IOStreams))
	cmds.AddCommand(version.NewCmdVersion(f, o.IOStreams))
	cmds.AddCommand(apiresources.NewCmdAPIVersions(f, o.IOStreams))
	cmds.AddCommand(apiresources.NewCmdAPIResources(f, o.IOStreams))
	cmds.AddCommand(options.NewCmdOptions(o.IOStreams.Out))

	// Stop warning about normalization of flags. That makes it possible to
	// add the klog flags later.
	cmds.SetGlobalNormalizationFunc(cliflag.WordSepNormalizeFunc)
	return cmds
}

// addCmdHeaderHooks performs updates on two hooks:
//   1) Modifies the passed "cmds" persistent pre-run function to parse command headers.
//      These headers will be subsequently added as X-headers to every
//      REST call.
//   2) Adds CommandHeaderRoundTripper as a wrapper around the standard
//      RoundTripper. CommandHeaderRoundTripper adds X-Headers then delegates
//      to standard RoundTripper.
// For beta, these hooks are updated unless the KUBECTL_COMMAND_HEADERS environment variable
// is set, and the value of the env var is false (or zero).
// See SIG CLI KEP 859 for more information:
//   https://github.com/kubernetes/enhancements/tree/master/keps/sig-cli/859-kubectl-headers
func addCmdHeaderHooks(cmds *cobra.Command, kubeConfigFlags *genericclioptions.ConfigFlags) {
	// If the feature gate env var is set to "false", then do no add kubectl command headers.
	if value, exists := os.LookupEnv(kubectlCmdHeaders); exists {
		if value == "false" || value == "0" {
			klog.V(5).Infoln("kubectl command headers turned off")
			return
		}
	}
	klog.V(5).Infoln("kubectl command headers turned on")
	crt := &genericclioptions.CommandHeaderRoundTripper{}
	existingPreRunE := cmds.PersistentPreRunE
	// Add command parsing to the existing persistent pre-run function.
	cmds.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
		crt.ParseCommandHeaders(cmd, args)
		return existingPreRunE(cmd, args)
	}
	wrapConfigFn := kubeConfigFlags.WrapConfigFn
	// Wraps CommandHeaderRoundTripper around standard RoundTripper.
	kubeConfigFlags.WrapConfigFn = func(c *rest.Config) *rest.Config {
		if wrapConfigFn != nil {
			c = wrapConfigFn(c)
		}
		c.Wrap(func(rt http.RoundTripper) http.RoundTripper {
			// Must be separate RoundTripper; not "crt" closure.
			// Fixes: https://github.com/kubernetes/kubectl/issues/1098
			return &genericclioptions.CommandHeaderRoundTripper{
				Delegate: rt,
				Headers:  crt.Headers,
			}
		})
		return c
	}
}

func runHelp(cmd *cobra.Command, args []string) {
	cmd.Help()
}

func registerCompletionFuncForGlobalFlags(cmd *cobra.Command, f cmdutil.Factory) {
	cmdutil.CheckErr(cmd.RegisterFlagCompletionFunc(
		"namespace",
		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
			return utilcomp.CompGetResource(f, cmd, "namespace", toComplete), cobra.ShellCompDirectiveNoFileComp
		}))
	cmdutil.CheckErr(cmd.RegisterFlagCompletionFunc(
		"context",
		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
			return utilcomp.ListContextsInConfig(toComplete), cobra.ShellCompDirectiveNoFileComp
		}))
	cmdutil.CheckErr(cmd.RegisterFlagCompletionFunc(
		"cluster",
		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
			return utilcomp.ListClustersInConfig(toComplete), cobra.ShellCompDirectiveNoFileComp
		}))
	cmdutil.CheckErr(cmd.RegisterFlagCompletionFunc(
		"user",
		func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
			return utilcomp.ListUsersInConfig(toComplete), cobra.ShellCompDirectiveNoFileComp
		}))
}
