/*
Copyright 2017 Heptio Inc.

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 restore

import (
	"fmt"
	"time"

	"github.com/pkg/errors"
	"github.com/spf13/cobra"
	"github.com/spf13/pflag"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	api "github.com/heptio/ark/pkg/apis/ark/v1"
	"github.com/heptio/ark/pkg/client"
	"github.com/heptio/ark/pkg/cmd"
	"github.com/heptio/ark/pkg/cmd/util/flag"
	"github.com/heptio/ark/pkg/cmd/util/output"
)

func NewCreateCommand(f client.Factory) *cobra.Command {
	o := NewCreateOptions()

	c := &cobra.Command{
		Use:   "create BACKUP",
		Short: "Create a restore",
		Run: func(c *cobra.Command, args []string) {
			cmd.CheckError(o.Validate(c, args))
			cmd.CheckError(o.Complete(args))
			cmd.CheckError(o.Run(c, f))
		},
	}

	o.BindFlags(c.Flags())
	output.BindFlags(c.Flags())
	output.ClearOutputFlagDefault(c)

	return c
}

type CreateOptions struct {
	BackupName        string
	RestoreVolumes    flag.OptionalBool
	Labels            flag.Map
	IncludeNamespaces flag.StringArray
	ExcludeNamespaces flag.StringArray
	IncludeResources  flag.StringArray
	ExcludeResources  flag.StringArray
	NamespaceMappings flag.Map
	Selector          flag.LabelSelector
}

func NewCreateOptions() *CreateOptions {
	return &CreateOptions{
		Labels:            flag.NewMap(),
		IncludeNamespaces: flag.NewStringArray("*"),
		NamespaceMappings: flag.NewMap().WithEntryDelimiter(",").WithKeyValueDelimiter(":"),
		RestoreVolumes:    flag.NewOptionalBool(nil),
	}
}

func (o *CreateOptions) BindFlags(flags *pflag.FlagSet) {
	flags.Var(&o.IncludeNamespaces, "include-namespaces", "namespaces to include in the restore (use '*' for all namespaces)")
	flags.Var(&o.ExcludeNamespaces, "exclude-namespaces", "namespaces to exclude from the restore")
	flags.Var(&o.NamespaceMappings, "namespace-mappings", "namespace mappings from name in the backup to desired restored name in the form src1:dst1,src2:dst2,...")
	flags.Var(&o.Labels, "labels", "labels to apply to the restore")
	flags.Var(&o.IncludeResources, "include-resources", "resources to include in the restore, formatted as resource.group, such as storageclasses.storage.k8s.io (use '*' for all resources)")
	flags.Var(&o.ExcludeResources, "exclude-resources", "resources to exclude from the restore, formatted as resource.group, such as storageclasses.storage.k8s.io")
	flags.VarP(&o.Selector, "selector", "l", "only restore resources matching this label selector")
	f := flags.VarPF(&o.RestoreVolumes, "restore-volumes", "", "whether to restore volumes from snapshots")
	// this allows the user to just specify "--restore-volumes" as shorthand for "--restore-volumes=true"
	// like a normal bool flag
	f.NoOptDefVal = "true"
}

func (o *CreateOptions) Validate(c *cobra.Command, args []string) error {
	if len(args) != 1 {
		return errors.New("you must specify only one argument, the backup's name")
	}

	if err := output.ValidateFlags(c); err != nil {
		return err
	}

	return nil
}

func (o *CreateOptions) Complete(args []string) error {
	o.BackupName = args[0]
	return nil
}

func (o *CreateOptions) Run(c *cobra.Command, f client.Factory) error {
	arkClient, err := f.Client()
	if err != nil {
		return err
	}

	restore := &api.Restore{
		ObjectMeta: metav1.ObjectMeta{
			Namespace: api.DefaultNamespace,
			Name:      fmt.Sprintf("%s-%s", o.BackupName, time.Now().Format("20060102150405")),
			Labels:    o.Labels.Data(),
		},
		Spec: api.RestoreSpec{
			BackupName:         o.BackupName,
			IncludedNamespaces: o.IncludeNamespaces,
			ExcludedNamespaces: o.ExcludeNamespaces,
			IncludedResources:  o.IncludeResources,
			ExcludedResources:  o.ExcludeResources,
			NamespaceMapping:   o.NamespaceMappings.Data(),
			LabelSelector:      o.Selector.LabelSelector,
			RestorePVs:         o.RestoreVolumes.Value,
		},
	}

	if printed, err := output.PrintWithFormat(c, restore); printed || err != nil {
		return err
	}

	restore, err = arkClient.ArkV1().Restores(restore.Namespace).Create(restore)
	if err != nil {
		return err
	}

	fmt.Printf("Restore %q created successfully.\n", restore.Name)
	return nil
}