You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wallbe_decorators.go
    path of file: ./repos/evcc/charger
    
    the code of the file until where you have to start completion: package charger

// Code generated by github.com/evcc-io/evcc/cmd/tools/decorate.go. DO NOT EDIT.

import (
	"github.com/evcc-io/evcc/api"
)

func decorateWallbe(base *Wallbe, meter func() (float64, error), meterEnergy func() (float64, error), phaseCurrents func() (float64, float64, float64, error), chargerEx func(float64) error) api.Charger {
	switch {
	case chargerEx == nil && meter == nil && meterEnergy == nil && phaseCurrents == nil:
		return base

	case chargerEx == nil && meter != nil && meterEnergy == nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.Meter
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
		}

	case chargerEx == nil && meter == nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.MeterEnergy
		}{
			Wallbe: base,
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx == nil && meter != nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.Meter
			api.MeterEnergy
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx == nil && meter == nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.PhaseCurrents
		}{
			Wallbe: base,
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx == nil && meter != nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.Meter
			api.PhaseCurrents
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx == nil && meter == nil && meterEnergy != nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.MeterEnergy
			api.PhaseCurrents
		}{
			Wallbe: base,
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx == nil && meter != nil && meterEnergy != nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.Meter
			api.MeterEnergy
			api.PhaseCurrents
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy == nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy == nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.MeterEnergy
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
			api.MeterEnergy
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.PhaseCurrents
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
			api.PhaseCurrents
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
		
    
func decorateWallbe(base *Wallbe, meter func() (float64, error), meterEnergy func() (float64, error), phaseCurrents func() (float64, float64, float64, error), chargerEx func(float64) error) api.Charger {
	switch {
	case chargerEx == nil && meter == nil && meterEnergy == nil && phaseCurrents == nil:
		return base

	case chargerEx == nil && meter != nil && meterEnergy == nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.Meter
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
		}

	case chargerEx == nil && meter == nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.MeterEnergy
		}{
			Wallbe: base,
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx == nil && meter != nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.Meter
			api.MeterEnergy
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx == nil && meter == nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.PhaseCurrents
		}{
			Wallbe: base,
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx == nil && meter != nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.Meter
			api.PhaseCurrents
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx == nil && meter == nil && meterEnergy != nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.MeterEnergy
			api.PhaseCurrents
		}{
			Wallbe: base,
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx == nil && meter != nil && meterEnergy != nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.Meter
			api.MeterEnergy
			api.PhaseCurrents
		}{
			Wallbe: base,
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy == nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy == nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.MeterEnergy
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy != nil && phaseCurrents == nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
			api.MeterEnergy
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.PhaseCurrents
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy == nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
			api.PhaseCurrents
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx != nil && meter == nil && meterEnergy != nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.MeterEnergy
			api.PhaseCurrents
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}

	case chargerEx != nil && meter != nil && meterEnergy != nil && phaseCurrents != nil:
		return &struct {
			*Wallbe
			api.ChargerEx
			api.Meter
			api.MeterEnergy
			api.PhaseCurrents
		}{
			Wallbe: base,
			ChargerEx: &decorateWallbeChargerExImpl{
				chargerEx: chargerEx,
			},
			Meter: &decorateWallbeMeterImpl{
				meter: meter,
			},
			MeterEnergy: &decorateWallbeMeterEnergyImpl{
				meterEnergy: meterEnergy,
			},
			PhaseCurrents: &decorateWallbePhaseCurrentsImpl{
				phaseCurrents: phaseCurrents,
			},
		}
	}

	return nil
}