package command

import (
	"fmt"
	"strings"

	"github.com/hashicorp/nomad/api/contexts"
	"github.com/posener/complete"
)

type VolumeDeleteCommand struct {
	Meta
}

func (c *VolumeDeleteCommand) Help() string {
	helpText := `
Usage: nomad volume delete [options] <vol id>

  Delete a volume from an external storage provider. The volume must still be
  registered with Nomad in order to be deleted. Deleting will fail if the
  volume is still in use by an allocation or in the process of being
  unpublished. If the volume no longer exists, this command will silently
  return without an error.

  When ACLs are enabled, this command requires a token with the
  'csi-write-volume' and 'csi-read-volume' capabilities for the volume's
  namespace.

General Options:

  ` + generalOptionsUsage(usageOptsDefault) + `

`
	return strings.TrimSpace(helpText)
}

func (c *VolumeDeleteCommand) AutocompleteFlags() complete.Flags {
	return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
		complete.Flags{})
}

func (c *VolumeDeleteCommand) AutocompleteArgs() complete.Predictor {
	return complete.PredictFunc(func(a complete.Args) []string {
		client, err := c.Meta.Client()
		if err != nil {
			return nil
		}

		resp, _, err := client.Search().PrefixSearch(a.Last, contexts.Volumes, nil)
		if err != nil {
			return []string{}
		}
		matches := resp.Matches[contexts.Volumes]

		resp, _, err = client.Search().PrefixSearch(a.Last, contexts.Nodes, nil)
		if err != nil {
			return []string{}
		}
		matches = append(matches, resp.Matches[contexts.Nodes]...)
		return matches
	})
}

func (c *VolumeDeleteCommand) Synopsis() string {
	return "Delete a volume"
}

func (c *VolumeDeleteCommand) Name() string { return "volume delete" }

func (c *VolumeDeleteCommand) Run(args []string) int {
	flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
	flags.Usage = func() { c.Ui.Output(c.Help()) }

	if err := flags.Parse(args); err != nil {
		c.Ui.Error(fmt.Sprintf("Error parsing arguments %s", err))
		return 1
	}

	// Check that we get exactly two arguments
	args = flags.Args()
	if l := len(args); l != 1 {
		c.Ui.Error("This command takes one argument: <vol id>")
		c.Ui.Error(commandErrorText(c))
		return 1
	}
	volID := args[0]

	// Get the HTTP client
	client, err := c.Meta.Client()
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
		return 1
	}

	err = client.CSIVolumes().Delete(volID, nil)
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Error deleting volume: %s", err))
		return 1
	}

	c.Ui.Output(fmt.Sprintf("Successfully deleted volume %q!", volID))
	return 0
}