/* 
 * https://ciapini.wiki.esiliati.org/view/ArNet
 */

#ifndef ARNET_TYPES_H
#define	ARNET_TYPES_H

#include <stdint.h>

#include "../net.h"

#define ARNET_PACKET_PROTOCOL               1 ///< 4bit net protocol id - arnet = 0

#define ARNET_PADDING                       0 

#define ARNET_ADDRESS_SIZE                  256 ///< max arnet address space
#define ARNET_MAX_HEADER_NUMBER             16  ///< max arnet optional headers
#define ARNET_MAX_PACKET_SIZE              1024+((ARNET_MAX_HEADER_NUMBER+1)*4)  ///< max arnet packet size

// ERRORS & STATUS
// #define ARNET_ERR_INVALID_SRC               1 // invalid source address
// #define ARNET_ERR_INVALID_DST               2 // invalid destination address

#define ARNET_EC_OK                         0
#define ARNET_EC_WRONG                      1
#define ARNET_EC_DISABLED                   2
#define ARNET_EC_INVALID_ALGO               3

#define ARNET_CRC24_INIT	0xffffff

/* TODO
typedef struct {
    uint8_t headers_pending;
    uint8_t headers_parsed;
    uint8_t headers_done[ARNET_MAX_HEADER_NUMBER];
} arnet_status;
*/

// il payload size va nella coda net

typedef struct {
    uint8_t protocol; ///< codice protocollo
    uint8_t header_size; ///< numero di header aggiuntivi
    uint16_t payload_size; ///< dimensione del payload in byte
    uint8_t src_addr; ///< indirizzo mittente
    uint8_t dst_addr; ///< indirizzo destinatario
} DH;

typedef struct {
    uint8_t enabled;
    // uint16_t vci;
    uint8_t sequence;
    uint8_t acknowledge;
} VC;

typedef struct {
    uint8_t enabled; 
    uint8_t algo;
    uint8_t ARQ;
    uint8_t ACK;
    uint32_t value;
} EC;

typedef struct {
    uint8_t enabled;
    uint8_t segaddr;
    uint8_t timeframe;
    uint8_t beacon_period;
    uint8_t reserved_window;
} SAAH;

typedef struct {
    DH dh; ///< default header
    VC vc; 
    EC ec;
    SAAH saah;
} arnet_packet;

extern uint8_t arnet_tx_headers_pending, arnet_tx_headers_done[16], arnet_rx_headers_parsed;
extern arnet_packet arnet_tx_packet_queue[NET_PACKET_RINGBUF_SIZE], arnet_rx_packet_queue[NET_PACKET_RINGBUF_SIZE];

#endif	/* ARNET_TYPES_H */