/**
 * @file    shellmatta_transport.h
 * @brief   transport layer functions of shellmatta
 * @author  Simon Fischer <fischer.simon.1991@gmail.com>
 */

#ifndef _SHELLMATTA_TRANSPORT_H_
#define _SHELLMATTA_TRANSPORT_H_

#include "shellmatta.h"

#define PROTOCOL_VERSION                    0x01u

/** @brief value of start-of-header character */
#define SHELLMATTA_START_OF_HEADER          0x01u

/** @brief max length of a request sequence counters payload */
#define SHELLMATTA_PAYLOAD_LEN_SEQ_REQ      ((uint8_t)(0))
/** @brief max length of a respond sequence counters payload */
#define SHELLMATTA_PAYLOAD_LEN_SEQ_RES      ((uint8_t)(0))
/** @brief max length of a request buffersize payload */
#define SHELLMATTA_PAYLOAD_LEN_BUFSIZE_REQ  ((uint8_t)(1))
/** @brief max length of a respond buffersize payload */
#define SHELLMATTA_PAYLOAD_LEN_BUFSIZE_RES  ((uint8_t)(1))

/* header field length defines */
#define SHELLMATTA_HEADER_LENGTH            ((uint8_t)(8))
/** @brief length of headerfield: start of header */
#define SHELLMATTA_LENGTH_SOH               ((uint8_t)(1))
/** @brief length of headerfield: protocol version */
#define SHELLMATTA_LENGTH_PROT_VERSION      ((uint8_t)(1))
/** @brief length of headerfield: packet type */
#define SHELLMATTA_LENGTH_PACKET_TYPE       ((uint8_t)(1))
/** @brief length of headerfield: payload length */
#define SHELLMATTA_LENGTH_PAYLOAD_LENGTH    ((uint8_t)(1))
/** @brief length of headerfield: source */
#define SHELLMATTA_LENGTH_SOURCE            ((uint8_t)(1))
/** @brief length of headerfield: destination */
#define SHELLMATTA_LENGTH_DESTINATION       ((uint8_t)(1))
/** @brief length of headerfield: host to shell sequence counter */
#define SHELLMATTA_LENGTH_H2S_SEQUENCE_CNT  ((uint8_t)(1))
/** @brief length of headerfield: shell to host sequence counter */
#define SHELLMATTA_LENGTH_S2H_SEQUENCE_CNT  ((uint8_t)(1))
/** @brief length of headerfield: crc32 of header + payload without crc32 */
#define SHELLMATTA_LENGTH_CRC               ((uint8_t)(4))

/* positional defines */
#define SHELLMATTA_POS_SOH                  ((uint8_t)0)
#define SHELLMATTA_POS_PROT_VER             ((uint8_t)1)
#define SHELLMATTA_POS_PACKET_TYPE          ((uint8_t)2)
#define SHELLMATTA_POS_PAYLOAD_LEN          ((uint8_t)3)
#define SHELLMATTA_POS_SRC                  ((uint8_t)4)
#define SHELLMATTA_POS_DST                  ((uint8_t)5)
#define SHELLMATTA_POS_CNT_H2S              ((uint8_t)6)
#define SHELLMATTA_POS_CNT_S2H              ((uint8_t)7)
#define SHELLMATTA_POS_PAYLOAD              ((uint8_t)8)

/* utility defines */
#define SHELLMATTA_SHIFT_BY_1               ((uint8_t)(1))
#define SHELLMATTA_SHIFT_BY_2               ((uint8_t)(2))
#define SHELLMATTA_SHIFT_BY_3               ((uint8_t)(3))
#define SHELLMATTA_SHIFT_BY_8               ((uint8_t)(8))
#define SHELLMATTA_SHIFT_BY_16              ((uint8_t)(16))
#define SHELLMATTA_SHIFT_BY_24              ((uint8_t)(24))


shellmatta_retCode_t shellmatta_reset_transport(shellmatta_transport_layer_t *transportLayer);

shellmatta_retCode_t shellmatta_init_transport_inst(shellmatta_transport_layer_t    *transportLayer,
                                                    shellmatta_write_t              writeFct);

shellmatta_retCode_t shellmatta_handle_transport_fsm(shellmatta_transport_layer_t *transportLayer,
                                                     char *data);

shellmatta_retCode_t shellmatta_write_transport(shellmatta_transport_layer_t *transportLayer,
                                                const char* data,
                                                uint32_t length);

#endif /* _SHELLMATTA_TRANSPORT_H_ */