//go:generate struct-markdown

package common

import (
	"fmt"
	"time"

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

// ShutdownConfig contains the configuration for VM shutdown.
type ShutdownConfig struct {
	// The command to use to gracefully shut down the
	// machine once all the provisioning is done. By default this is an empty
	// string, which tells Packer to just forcefully shut down the machine.
	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 it
	// doesn't shut down in this time, it is an error. By default, the timeout is
	// "5m", or five minutes.
	RawShutdownTimeout string `mapstructure:"shutdown_timeout" required:"false"`

	ShutdownTimeout time.Duration ``
}

// Prepare sets default values to the VM shutdown configuration.
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
}