package proto

type (
	clientID uint16
	flag     uint8
	state    uint8
	version  uint8
)

/*
0 -   AUTH REQUEST
1 -   AUTH RESPONSE
2 -   CLIENT DATA
254 - ACK
255 - NAK
*/
const (
	AUTH_REQUEST flag = iota
	AUTH_RESPONSE
	CLIENT_DATA
	ACK flag = 254
	NAK flag = 255
)

const (
	NOT_CONNECTED state = iota
	SENT_AUTH
	AUTH_TOT
	AUTHENTICATED
	CONNECTED
	SENT_DATA
	RECEIVED_ACK
	RECEIVED_NAK
)

const (
	VERSION version = 1
)

/*
===================================================
| VERSION 1 byte | FLAG 1 byte | CLIENT ID 2 byte |
===================================================
|                   LEN OF DATA 4 bytes           |
===================================================
*/
type Header struct {
	Version  version
	Flag     flag
	ClientID clientID
	DataLen  uint32
}

/*
AUTH DATA (REQUEST)
===================================================
|               AUTH KEY 0 4 bytes                |
===================================================
*/

type Request struct {
	Akey_0 uint64
}

/*
AUTH DATA (RESPONSE)
===================================================
|               CLIENT KEY 0 4 bytes              |
===================================================
===================================================
|               CLIENT KEY 1 4 bytes              |
===================================================
===================================================
|               CLIENT KEY 2 4 bytes              |
===================================================
===================================================
|               CLIENT KEY 3 4 bytes              |
===================================================
*/
type Response struct {
	CKey_0 uint32
	Ckey_1 uint32
	Ckey_2 uint32
	Ckey_3 uint32
}

/*
CLIENT DATA
===================================================
|               CLIENT KEY 0 4 bytes              |
===================================================
===================================================
|               CLIENT KEY 1 4 bytes              |
===================================================
===================================================
|               CLIENT KEY 2 4 bytes              |
===================================================
===================================================
|               CLIENT KEY 3 4 bytes              |
===================================================
===================================================
|               NOW 4 bytes                       |
===================================================
===================================================
|               DAY 4 bytes                       |
===================================================
===================================================
|               EXPORT 4 bytes                    |
===================================================
===================================================
|               GAS 4 bytes                       |
===================================================
*/
type Energy struct {
	CKey   Response
	Now    float32
	Day    float32
	Export float32
	Gas    float32
}

type Session struct {
	CKey_p1 uint64
	Ckey_p2 uint64
	Header  Header
	Mpan    uint64
	State   state
}