package ovf

import (
	"github.com/mitchellh/packer/builder/virtualbox/common"
)

// Builder implements packer.Builder and builds the actual VirtualBox
// images.
type Builder struct {
	config *Config
	runner multistep.Runner
}

// Prepare processes the build configuration parameters.
func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
	c, warnings, errs := NewConfig(raws...)
	if errs != nil {
		return warnings, errs
	}
	b.config = c

	return warnings, nil
}

// Run executes a Packer build and returns a packer.Artifact representing
// a VirtualBox appliance.
func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
	// Set up the state.
	state := new(multistep.BasicStateBag)
	state.Put("config", b.config)
	state.Put("hook", hook)
	state.Put("ui", ui)

	// Build the steps.
	steps := []multistep.Step{
	/*
		new(stepDownloadGuestAdditions),
	*/
	/*
		new(stepPrepareOutputDir),
		&common.StepCreateFloppy{
			Files: b.config.FloppyFiles,
		},
		new(stepSuppressMessages),
		new(stepAttachGuestAdditions),
		new(stepAttachFloppy),
		new(stepForwardSSH),
		new(stepVBoxManage),
		new(stepRun),
		new(stepTypeBootCommand),
		&common.StepConnectSSH{
			SSHAddress:     sshAddress,
			SSHConfig:      sshConfig,
			SSHWaitTimeout: b.config.sshWaitTimeout,
		},
		new(stepUploadVersion),
		new(stepUploadGuestAdditions),
		new(common.StepProvision),
		new(stepShutdown),
		new(stepRemoveDevices),
		new(stepExport),
	*/
	}

	// Run the steps.
	if b.config.PackerDebug {
		b.runner = &multistep.DebugRunner{
			Steps:   steps,
			PauseFn: common.MultistepDebugFn(ui),
		}
	} else {
		b.runner = &multistep.BasicRunner{Steps: steps}
	}
	b.runner.Run(state)

	// Report any errors.
	if rawErr, ok := state.GetOk("error"); ok {
		return nil, rawErr.(error)
	}

	// If we were interrupted or cancelled, then just exit.
	if _, ok := state.GetOk(multistep.StateCancelled); ok {
		return nil, errors.New("Build was cancelled.")
	}

	if _, ok := state.GetOk(multistep.StateHalted); ok {
		return nil, errors.New("Build was halted.")
	}

	artifact := &Artifact{
		imageName: state.Get("image_name").(string),
		driver:    driver,
	}
	return artifact, nil
}

// Cancel.
func (b *Builder) Cancel() {
	if b.runner != nil {
		log.Println("Cancelling the step runner...")
		b.runner.Cancel()
	}
}