package oneandone

import (
	"context"
	"errors"
	"fmt"

	"github.com/hashicorp/hcl/v2/hcldec"
	"github.com/hashicorp/packer/common"
	"github.com/hashicorp/packer/helper/communicator"
	"github.com/hashicorp/packer/helper/multistep"
	"github.com/hashicorp/packer/packer"
)

const BuilderId = "packer.oneandone"

type Builder struct {
	config Config
	runner multistep.Runner
}

func (b *Builder) ConfigSpec() hcldec.ObjectSpec { return b.config.FlatMapstructure().HCL2Spec() }

func (b *Builder) Prepare(raws ...interface{}) ([]string, []string, error) {
	warnings, errs := b.config.Prepare(raws...)
	if errs != nil {
		return nil, warnings, errs
	}

	return nil, warnings, nil
}

func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {

	state := new(multistep.BasicStateBag)

	state.Put("config", &b.config)
	state.Put("hook", hook)
	state.Put("ui", ui)

	steps := []multistep.Step{
		&StepCreateSSHKey{
			Debug:        b.config.PackerDebug,
			DebugKeyPath: fmt.Sprintf("oneandone_%s", b.config.SnapshotName),
		},
		new(stepCreateServer),
		&communicator.StepConnect{
			Config:    &b.config.Comm,
			Host:      communicator.CommHost(b.config.Comm.SSHHost, "server_ip"),
			SSHConfig: b.config.Comm.SSHConfigFunc(),
		},
		&common.StepProvision{},
		&common.StepCleanupTempKeys{
			Comm: &b.config.Comm,
		},
		new(stepTakeSnapshot),
	}

	b.runner = common.NewRunner(steps, b.config.PackerConfig, ui)
	b.runner.Run(ctx, state)

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

	if temp, ok := state.GetOk("snapshot_name"); ok {
		b.config.SnapshotName = temp.(string)
	}

	artifact := &Artifact{
		snapshotName: b.config.SnapshotName,
	}

	if id, ok := state.GetOk("snapshot_id"); ok {
		artifact.snapshotId = id.(string)
	} else {
		return nil, errors.New("Image creation has failed.")
	}

	return artifact, nil
}