/*
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 replace

import (
	"fmt"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/spf13/cobra"

	"k8s.io/klog/v2"

	"k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/cli-runtime/pkg/genericiooptions"
	"k8s.io/cli-runtime/pkg/resource"
	"k8s.io/kubectl/pkg/cmd/delete"
	cmdutil "k8s.io/kubectl/pkg/cmd/util"
	"k8s.io/kubectl/pkg/rawhttp"
	"k8s.io/kubectl/pkg/scheme"
	"k8s.io/kubectl/pkg/util"
	"k8s.io/kubectl/pkg/util/i18n"
	"k8s.io/kubectl/pkg/util/slice"
	"k8s.io/kubectl/pkg/util/templates"
	"k8s.io/kubectl/pkg/validation"
)

var (
	replaceLong = templates.LongDesc(i18n.T(`
		Replace a resource by file name or stdin.

		JSON and YAML formats are accepted. If replacing an existing resource, the
		complete resource spec must be provided. This can be obtained by

		    $ kubectl get TYPE NAME -o yaml`))

	replaceExample = templates.Examples(i18n.T(`
		# Replace a pod using the data in pod.json
		kubectl replace -f ./pod.json

		# Replace a pod based on the JSON passed into stdin
		cat pod.json | kubectl replace -f -

		# Update a single-container pod's image version (tag) to v4
		kubectl get pod mypod -o yaml | sed 's/\(image: myimage\):.*$/\1:v4/' | kubectl replace -f -

		# Force replace, delete and then re-create the resource
		kubectl replace --force -f ./pod.json`))
)

var supportedSubresources = []string{"status", "scale"}

type ReplaceOptions struct {
	PrintFlags  *genericclioptions.PrintFlags
	RecordFlags *genericclioptions.RecordFlags

	DeleteFlags   *delete.DeleteFlags
	DeleteOptions *delete.DeleteOptions

	DryRunStrategy      cmdutil.DryRunStrategy
	validationDirective string

	PrintObj func(obj runtime.Object) error

	createAnnotation bool

	Schema      validation.Schema
	Builder     func() *resource.Builder
	BuilderArgs []string

	Namespace        string
	EnforceNamespace bool
	Raw              string

	Recorder genericclioptions.Recorder

	Subresource string

	genericiooptions.IOStreams

	fieldManager string
}

func NewReplaceOptions(streams genericiooptions.IOStreams) *ReplaceOptions {
	return &ReplaceOptions{
		PrintFlags:  genericclioptions.NewPrintFlags("replaced"),
		DeleteFlags: delete.NewDeleteFlags("The files that contain the configurations to replace."),

		IOStreams: streams,
	}
}

func NewCmdReplace(f cmdutil.Factory, streams genericiooptions.IOStreams) *cobra.Command {
	o := NewReplaceOptions(streams)

	cmd := &cobra.Command{
		Use:                   "replace -f FILENAME",
		DisableFlagsInUseLine: true,
		Short:                 i18n.T("Replace a resource by file name or stdin"),
		Long:                  replaceLong,
		Example:               replaceExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(o.Complete(f, cmd, args))
			cmdutil.CheckErr(o.Validate())
			cmdutil.CheckErr(o.Run(f))
		},
	}

	o.PrintFlags.AddFlags(cmd)
	o.DeleteFlags.AddFlags(cmd)
	o.RecordFlags.AddFlags(cmd)

	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddDryRunFlag(cmd)

	cmd.Flags().StringVar(&o.Raw, "raw", o.Raw, "Raw URI to PUT to the server.  Uses the transport specified by the kubeconfig file.")
	cmdutil.AddFieldManagerFlagVar(cmd, &o.fieldManager, "kubectl-replace")
	cmdutil.AddSubresourceFlags(cmd, &o.Subresource, "If specified, replace will operate on the subresource of the requested object.", supportedSubresources...)

	return cmd
}

func (o *ReplaceOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	var err error

	o.RecordFlags.Complete(cmd)
	o.Recorder, err = o.RecordFlags.ToRecorder()
	if err != nil {
		return err
	}

	o.validationDirective, err = cmdutil.GetValidationDirective(cmd)
	if err != nil {
		return err
	}
	o.createAnnotation = cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag)

	o.DryRunStrategy, err = cmdutil.GetDryRunStrategy(cmd)
	if err != nil {
		return err
	}
	dynamicClient, err := f.DynamicClient()
	if err != nil {
		return err
	}
	cmdutil.PrintFlagsWithDryRunStrategy(o.PrintFlags, o.DryRunStrategy)

	printer, err := o.PrintFlags.ToPrinter()
	if err != nil {
		return err
	}
	o.PrintObj = func(obj runtime.Object) error {
		return printer.PrintObj(obj, o.Out)
	}

	deleteOpts, err := o.DeleteFlags.ToOptions(dynamicClient, o.IOStreams)
	if err != nil {
		return err
	}

	//Replace will create a resource if it doesn't exist already, so ignore not found error
	deleteOpts.IgnoreNotFound = true
	if o.PrintFlags.OutputFormat != nil {
		deleteOpts.Output = *o.PrintFlags.OutputFormat
	}
	if deleteOpts.GracePeriod == 0 {
		// To preserve backwards compatibility, but prevent accidental data loss, we convert --grace-period=0
		// into --grace-period=1 and wait until the object is successfully deleted.
		deleteOpts.GracePeriod = 1
		deleteOpts.WaitForDeletion = true
	}
	o.DeleteOptions = deleteOpts

	err = o.DeleteOptions.FilenameOptions.RequireFilenameOrKustomize()
	if err != nil {
		return err
	}

	schema, err := f.Validator(o.validationDirective)
	if err != nil {
		return err
	}

	o.Schema = schema
	o.Builder = f.NewBuilder
	o.BuilderArgs = args

	o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
	if err != nil {
		return err
	}

	return nil
}

func (o *ReplaceOptions) Validate() error {
	if o.DeleteOptions.GracePeriod >= 0 && !o.DeleteOptions.ForceDeletion {
		return fmt.Errorf("--grace-period must have --force specified")
	}

	if o.DeleteOptions.Timeout != 0 && !o.DeleteOptions.ForceDeletion {
		return fmt.Errorf("--timeout must have --force specified")
	}

	if o.DeleteOptions.ForceDeletion && o.DryRunStrategy != cmdutil.DryRunNone {
		return fmt.Errorf("--dry-run can not be used when --force is set")
	}

	if cmdutil.IsFilenameSliceEmpty(o.DeleteOptions.FilenameOptions.Filenames, o.DeleteOptions.FilenameOptions.Kustomize) {
		return fmt.Errorf("must specify --filename to replace")
	}

	if len(o.Raw) > 0 {
		if len(o.DeleteOptions.FilenameOptions.Filenames) != 1 {
			return fmt.Errorf("--raw can only use a single local file or stdin")
		}
		if strings.Index(o.DeleteOptions.FilenameOptions.Filenames[0], "http://") == 0 || strings.Index(o.DeleteOptions.FilenameOptions.Filenames[0], "https://") == 0 {
			return fmt.Errorf("--raw cannot read from a url")
		}
		if o.DeleteOptions.FilenameOptions.Recursive {
			return fmt.Errorf("--raw and --recursive are mutually exclusive")
		}
		if o.PrintFlags.OutputFormat != nil && len(*o.PrintFlags.OutputFormat) > 0 {
			return fmt.Errorf("--raw and --output are mutually exclusive")
		}
		if _, err := url.ParseRequestURI(o.Raw); err != nil {
			return fmt.Errorf("--raw must be a valid URL path: %v", err)
		}
	}

	if len(o.Subresource) > 0 && !slice.ContainsString(supportedSubresources, o.Subresource, nil) {
		return fmt.Errorf("invalid subresource value: %q. Must be one of %v", o.Subresource, supportedSubresources)
	}

	return nil
}

func (o *ReplaceOptions) Run(f cmdutil.Factory) error {
	// raw only makes sense for a single file resource multiple objects aren't likely to do what you want.
	// the validator enforces this, so
	if len(o.Raw) > 0 {
		restClient, err := f.RESTClient()
		if err != nil {
			return err
		}
		return rawhttp.RawPut(restClient, o.IOStreams, o.Raw, o.DeleteOptions.Filenames[0])
	}

	if o.DeleteOptions.ForceDeletion {
		return o.forceReplace()
	}

	r := o.Builder().
		Unstructured().
		Schema(o.Schema).
		ContinueOnError().
		NamespaceParam(o.Namespace).DefaultNamespace().
		FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
		Subresource(o.Subresource).
		Flatten().
		Do()
	if err := r.Err(); err != nil {
		return err
	}

	return r.Visit(func(info *resource.Info, err error) error {
		if err != nil {
			return err
		}

		if err := util.CreateOrUpdateAnnotation(o.createAnnotation, info.Object, scheme.DefaultJSONEncoder()); err != nil {
			return cmdutil.AddSourceToErr("replacing", info.Source, err)
		}

		if err := o.Recorder.Record(info.Object); err != nil {
			klog.V(4).Infof("error recording current command: %v", err)
		}

		if o.DryRunStrategy == cmdutil.DryRunClient {
			return o.PrintObj(info.Object)
		}

		// Serialize the object with the annotation applied.
		obj, err := resource.
			NewHelper(info.Client, info.Mapping).
			DryRun(o.DryRunStrategy == cmdutil.DryRunServer).
			WithFieldManager(o.fieldManager).
			WithFieldValidation(o.validationDirective).
			WithSubresource(o.Subresource).
			Replace(info.Namespace, info.Name, true, info.Object)
		if err != nil {
			return cmdutil.AddSourceToErr("replacing", info.Source, err)
		}

		info.Refresh(obj, true)
		return o.PrintObj(info.Object)
	})
}

func (o *ReplaceOptions) forceReplace() error {
	stdinInUse := false
	for i, filename := range o.DeleteOptions.FilenameOptions.Filenames {
		if filename == "-" {
			tempDir, err := os.MkdirTemp("", "kubectl_replace_")
			if err != nil {
				return err
			}
			defer os.RemoveAll(tempDir)
			tempFilename := filepath.Join(tempDir, "resource.stdin")
			err = cmdutil.DumpReaderToFile(os.Stdin, tempFilename)
			if err != nil {
				return err
			}
			o.DeleteOptions.FilenameOptions.Filenames[i] = tempFilename
			stdinInUse = true
		}
	}

	b := o.Builder().
		Unstructured().
		ContinueOnError().
		NamespaceParam(o.Namespace).DefaultNamespace().
		ResourceTypeOrNameArgs(false, o.BuilderArgs...).RequireObject(false).
		FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
		Subresource(o.Subresource).
		Flatten()
	if stdinInUse {
		b = b.StdinInUse()
	}
	r := b.Do()
	if err := r.Err(); err != nil {
		return err
	}

	if err := o.DeleteOptions.DeleteResult(r); err != nil {
		return err
	}

	timeout := o.DeleteOptions.Timeout
	if timeout == 0 {
		timeout = 5 * time.Minute
	}
	err := r.Visit(func(info *resource.Info, err error) error {
		if err != nil {
			return err
		}

		return wait.PollImmediate(1*time.Second, timeout, func() (bool, error) {
			if err := info.Get(); !errors.IsNotFound(err) {
				return false, err
			}
			return true, nil
		})
	})
	if err != nil {
		return err
	}

	b = o.Builder().
		Unstructured().
		Schema(o.Schema).
		ContinueOnError().
		NamespaceParam(o.Namespace).DefaultNamespace().
		FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
		Subresource(o.Subresource).
		Flatten()
	if stdinInUse {
		b = b.StdinInUse()
	}
	r = b.Do()
	err = r.Err()
	if err != nil {
		return err
	}

	count := 0
	err = r.Visit(func(info *resource.Info, err error) error {
		if err != nil {
			return err
		}

		if err := util.CreateOrUpdateAnnotation(o.createAnnotation, info.Object, scheme.DefaultJSONEncoder()); err != nil {
			return err
		}

		if err := o.Recorder.Record(info.Object); err != nil {
			klog.V(4).Infof("error recording current command: %v", err)
		}

		obj, err := resource.NewHelper(info.Client, info.Mapping).
			WithFieldManager(o.fieldManager).
			WithFieldValidation(o.validationDirective).
			Create(info.Namespace, true, info.Object)
		if err != nil {
			return err
		}

		count++
		info.Refresh(obj, true)
		return o.PrintObj(info.Object)
	})
	if err != nil {
		return err
	}
	if count == 0 {
		return fmt.Errorf("no objects passed to replace")
	}
	return nil
}