// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package command

import (
	"errors"
	"fmt"
	"strconv"
	"strings"

	"github.com/mitchellh/cli"
	"github.com/posener/complete"
)

type VarPurgeCommand struct {
	Meta
}

func (c *VarPurgeCommand) Help() string {
	helpText := `
Usage: nomad var purge [options] <path>

  Purge is used to permanently delete an existing variable.

  If ACLs are enabled, this command requires a token with the 'variables:destroy'
  capability for the target variable's namespace and path.

General Options:

  ` + generalOptionsUsage(usageOptsDefault) + `

Purge Options:

  -check-index
    If set, the variable is only acted upon if the server side version's modify
    index matches the provided value.
`

	return strings.TrimSpace(helpText)
}

func (c *VarPurgeCommand) AutocompleteFlags() complete.Flags {
	return c.Meta.AutocompleteFlags(FlagSetClient)
}

func (c *VarPurgeCommand) AutocompleteArgs() complete.Predictor {
	return VariablePathPredictor(c.Meta.Client)
}

func (c *VarPurgeCommand) Synopsis() string {
	return "Purge a variable"
}

func (c *VarPurgeCommand) Name() string { return "var purge" }

func (c *VarPurgeCommand) Run(args []string) int {
	var checkIndexStr string

	flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
	flags.Usage = func() { c.Ui.Output(c.Help()) }
	flags.StringVar(&checkIndexStr, "check-index", "", "")

	if err := flags.Parse(args); err != nil {
		return 1
	}

	// Check that we got one argument
	args = flags.Args()
	if l := len(args); l != 1 {
		c.Ui.Error("This command takes one argument: <path>")
		c.Ui.Error(commandErrorText(c))
		return 1
	}

	// Parse the check-index
	checkIndex, enforce, err := parseCheckIndex(checkIndexStr)
	if err != nil {
		switch {
		case errors.Is(err, strconv.ErrRange):
			c.Ui.Error(fmt.Sprintf("Invalid -check-index value %q: out of range for uint64", checkIndexStr))
		case errors.Is(err, strconv.ErrSyntax):
			c.Ui.Error(fmt.Sprintf("Invalid -check-index value %q: not parsable as uint64", checkIndexStr))
		default:
			c.Ui.Error(fmt.Sprintf("Error parsing -check-index value %q: %v", checkIndexStr, err))
		}
		return 1
	}

	if c.Meta.namespace == "*" {
		c.Ui.Error(errWildcardNamespaceNotAllowed)
		return 1
	}

	path := 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
	}

	if enforce {
		_, err = client.Variables().CheckedDelete(path, checkIndex, nil)
	} else {
		_, err = client.Variables().Delete(path, nil)
	}

	if err != nil {
		if handled := handleCASError(err, c); handled {
			return 1
		}
		c.Ui.Error(fmt.Sprintf("Error purging variable: %s", err))
		return 1
	}

	c.Ui.Output(fmt.Sprintf("Successfully purged variable %q!", path))
	return 0
}

func (c *VarPurgeCommand) GetConcurrentUI() cli.ConcurrentUi {
	return cli.ConcurrentUi{Ui: c.Ui}
}
