//go:generate struct-markdown

package shutdowncommand

import (
	"fmt"
	"time"

	"github.com/hashicorp/packer/template/interpolate"
)

type ShutdownConfig struct {
	// The command to use to gracefully shut down the machine once all
	// provisioning is complete. By default this is an empty string, which
	// tells Packer to just forcefully shut down the machine. This setting can
	// be safely omitted if for example, a shutdown command to gracefully halt
	// the machine is configured inside a provisioning script. If one or more
	// scripts require a reboot it is suggested to leave this blank (since
	// reboots may fail) and instead specify the final shutdown command in your
	// last script.
	ShutdownCommand string `mapstructure:"shutdown_command" required:"false"`
	// The amount of time to wait after executing the shutdown_command for the
	// virtual machine to actually shut down. If the machine doesn't shut down
	// in this time it is considered an error. By default, the time out is "5m"
	// (five minutes).
	RawShutdownTimeout string `mapstructure:"shutdown_timeout" required:"false"`

	ShutdownTimeout time.Duration ``
}

func (c *ShutdownConfig) Prepare(ctx *interpolate.Context) []error {
	if c.RawShutdownTimeout == "" {
		c.RawShutdownTimeout = "5m"
	}

	var errs []error
	var err error
	c.ShutdownTimeout, err = time.ParseDuration(c.RawShutdownTimeout)
	if err != nil {
		errs = append(errs, fmt.Errorf("Failed parsing shutdown_timeout: %s", err))
	}

	return errs
}