// The bsusurrogate package contains a packer.Builder implementation that
// builds a new EBS-backed OMI using an ephemeral instance.
package bsusurrogate

import (
	"crypto/tls"
	"errors"
	"fmt"
	"log"
	"net/http"

	osccommon "github.com/hashicorp/packer/builder/osc/common"
	"github.com/hashicorp/packer/common"
	"github.com/hashicorp/packer/helper/config"
	"github.com/hashicorp/packer/helper/multistep"
	"github.com/hashicorp/packer/packer"
	"github.com/hashicorp/packer/template/interpolate"
	"github.com/outscale/osc-go/oapi"
)

const BuilderId = "digitalonus.osc.bsusurrogate"

type Config struct {
	common.PackerConfig    `mapstructure:",squash"`
	osccommon.AccessConfig `mapstructure:",squash"`
	osccommon.RunConfig    `mapstructure:",squash"`
	osccommon.BlockDevices `mapstructure:",squash"`
	osccommon.OMIConfig    `mapstructure:",squash"`

	RootDevice    RootBlockDevice  `mapstructure:"omi_root_device"`
	VolumeRunTags osccommon.TagMap `mapstructure:"run_volume_tags"`

	ctx interpolate.Context
}

type Builder struct {
	config Config
	runner multistep.Runner
}

func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {

	b.config.ctx.Funcs = osccommon.TemplateFuncs

	err := config.Decode(&b.config, &config.DecodeOpts{
		Interpolate:        true,
		InterpolateContext: &b.config.ctx,
		InterpolateFilter: &interpolate.RenderFilter{
			Exclude: []string{
				"omi_description",
				"run_tags",
				"run_volume_tags",
				"snapshot_tags",
				"spot_tags",
				"tags",
			},
		},
	}, raws...)
	if err != nil {
		return nil, err
	}

	if b.config.PackerConfig.PackerForce {
		b.config.OMIForceDeregister = true
	}

	// Accumulate any errors
	var errs *packer.MultiError
	errs = packer.MultiErrorAppend(errs, b.config.AccessConfig.Prepare(&b.config.ctx)...)
	errs = packer.MultiErrorAppend(errs, b.config.RunConfig.Prepare(&b.config.ctx)...)
	errs = packer.MultiErrorAppend(errs,
		b.config.OMIConfig.Prepare(&b.config.AccessConfig, &b.config.ctx)...)
	errs = packer.MultiErrorAppend(errs, b.config.BlockDevices.Prepare(&b.config.ctx)...)
	errs = packer.MultiErrorAppend(errs, b.config.RootDevice.Prepare(&b.config.ctx)...)

	if b.config.OMIVirtType == "" {
		errs = packer.MultiErrorAppend(errs, errors.New("omi_virtualization_type is required."))
	}

	foundRootVolume := false
	for _, launchDevice := range b.config.BlockDevices.LaunchMappings {
		if launchDevice.DeviceName == b.config.RootDevice.SourceDeviceName {
			foundRootVolume = true
		}
	}

	if !foundRootVolume {
		errs = packer.MultiErrorAppend(errs, fmt.Errorf("no volume with name '%s' is found", b.config.RootDevice.SourceDeviceName))
	}

	//TODO: Chek if this is necessary
	if b.config.IsSpotVm() && ((b.config.OMIENASupport != nil && *b.config.OMIENASupport) || b.config.OMISriovNetSupport) {
		errs = packer.MultiErrorAppend(errs,
			fmt.Errorf("Spot instances do not support modification, which is required "+
				"when either `ena_support` or `sriov_support` are set. Please ensure "+
				"you use an OMI that already has either SR-IOV or ENA enabled."))
	}

	if errs != nil && len(errs.Errors) > 0 {
		return nil, errs
	}

	packer.LogSecretFilter.Set(b.config.AccessKey, b.config.SecretKey, b.config.Token)
	return nil, nil

}

func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
	clientConfig, err := b.config.Config()
	if err != nil {
		return nil, err
	}

	skipClient := &http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
		},
	}

	oapiconn := oapi.NewClient(clientConfig, skipClient)

	// Setup the state bag and initial state for the steps
	state := new(multistep.BasicStateBag)
	state.Put("config", &b.config)
	state.Put("oapi", oapiconn)
	state.Put("clientConfig", clientConfig)
	state.Put("hook", hook)
	state.Put("ui", ui)

	//VMStep

	//omiDevices := b.config.BuildOMIDevices()
	//launchDevices := b.config.BuildLaunchDevices()

	steps := []multistep.Step{
		&osccommon.StepPreValidate{
			DestOmiName:     b.config.OMIName,
			ForceDeregister: b.config.OMIForceDeregister,
		},
	}

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

	// If there was an error, return that
	if rawErr, ok := state.GetOk("error"); ok {
		return nil, rawErr.(error)
	}

	//Build the artifact
	// if omis, ok := state.GetOk("omis"); ok {
	// 	// Build the artifact and return it
	// 	artifact := &awscommon.Artifact{
	// 		Amis:           omis.(map[string]string),
	// 		BuilderIdValue: BuilderId,
	// 		Session:        session,
	// 	}

	// 	return artifact, nil
	// }

	return nil, nil
}

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