package daemon

import (
	"fmt"

	"src.dualinventive.com/go/devsim/simulator"
	"src.dualinventive.com/go/devsim/storage"
	"src.dualinventive.com/go/dinet/rpc"
	"src.dualinventive.com/go/lib/kv"
)

// Storage for saving the state of the daemon
type Storage interface {
	GetDeviceStorage(deviceUID string) simulator.Storage
	GetNextDeviceUID() (string, error)
}

// RAMStorage for stor
type RAMStorage struct {
	simUID uint64
}

// GetDeviceStorage creates a new in-ram storage for the simulator
func (r *RAMStorage) GetDeviceStorage(deviceUID string) simulator.Storage {
	dStorage, err := storage.NewKV(deviceUID, kv.TypeRAM, "")
	if err != nil {
		return nil
	}
	return dStorage
}

// GetNextDeviceUID generates unique device uids
func (r *RAMStorage) GetNextDeviceUID() (string, error) {
	uid := fmt.Sprintf("FF%016x", r.simUID)
	uid, err := rpc.GenerateDeviceUID(rpc.DeviceUIDPrefixSimulator, uid)
	if err != nil {
		return "", ErrCannotCreateDeviceUID
	}

	r.simUID++
	return uid, nil
}