/*
Copyright The Velero contributors.

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 snapshotlocation

import (
	"context"
	"fmt"

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

	kbclient "sigs.k8s.io/controller-runtime/pkg/client"

	velerov1api "github.com/vmware-tanzu/velero/pkg/apis/velero/v1"
	"github.com/vmware-tanzu/velero/pkg/builder"
	"github.com/vmware-tanzu/velero/pkg/client"
	"github.com/vmware-tanzu/velero/pkg/cmd"
	"github.com/vmware-tanzu/velero/pkg/cmd/util/flag"
	"github.com/vmware-tanzu/velero/pkg/cmd/util/output"
)

func NewSetCommand(f client.Factory, use string) *cobra.Command {
	o := NewSetOptions()

	c := &cobra.Command{
		Use:   use + " NAME",
		Short: "Set specific features for a snapshot location",
		Args:  cobra.ExactArgs(1),
		Run: func(c *cobra.Command, args []string) {
			cmd.CheckError(o.Complete(args, f))
			cmd.CheckError(o.Validate(c, args, f))
			cmd.CheckError(o.Run(c, f))
		},
	}

	o.BindFlags(c.Flags())
	return c
}

type SetOptions struct {
	Name       string
	Credential flag.Map
}

func NewSetOptions() *SetOptions {
	return &SetOptions{
		Credential: flag.NewMap(),
	}
}

func (o *SetOptions) BindFlags(flags *pflag.FlagSet) {
	flags.Var(&o.Credential, "credential", "Sets the credential to be used by this location as a key-value pair, where the key is the Kubernetes Secret name, and the value is the data key name within the Secret. Optional, one value only.")
}

func (o *SetOptions) Validate(c *cobra.Command, args []string, f client.Factory) error {
	if err := output.ValidateFlags(c); err != nil {
		return err
	}

	if len(o.Credential.Data()) > 1 {
		return errors.New("--credential can only contain 1 key/value pair")
	}

	return nil
}

func (o *SetOptions) Complete(args []string, f client.Factory) error {
	o.Name = args[0]
	return nil
}

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

	location := &velerov1api.VolumeSnapshotLocation{}
	err = kbClient.Get(context.Background(), kbclient.ObjectKey{
		Namespace: f.Namespace(),
		Name:      o.Name,
	}, location)
	if err != nil {
		return errors.WithStack(err)
	}

	for name, key := range o.Credential.Data() {
		location.Spec.Credential = builder.ForSecretKeySelector(name, key).Result()
		break
	}

	if err := kbClient.Update(context.Background(), location, &kbclient.UpdateOptions{}); err != nil {
		return errors.WithStack(err)
	}

	fmt.Printf("Volume snapshot location %q configured successfully.\n", o.Name)
	return nil
}