#ifndef __ISOTP_TYPES__
#define __ISOTP_TYPES__

/**************************************************************
 * compiler specific defines
 *************************************************************/
#ifdef __GNUC__
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define ISOTP_BYTE_ORDER_LITTLE_ENDIAN
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#else
#error "unsupported byte ordering"
#endif
#endif

/**************************************************************
 * OS specific defines
 *************************************************************/
#ifdef _WIN32
#define snprintf _snprintf
#endif

#ifdef _WIN32
#define ISOTP_BYTE_ORDER_LITTLE_ENDIAN
#define __builtin_bswap8  _byteswap_uint8
#define __builtin_bswap16 _byteswap_uint16
#define __builtin_bswap32 _byteswap_uint32
#define __builtin_bswap64 _byteswap_uint64
#endif

/**************************************************************
 * internal used defines
 *************************************************************/
#define ISOTP_RET_OK           0
#define ISOTP_RET_ERROR        -1
#define ISOTP_RET_INPROGRESS   -2
#define ISOTP_RET_OVERFLOW     -3
#define ISOTP_RET_WRONG_SN     -4
#define ISOTP_RET_NO_DATA      -5
#define ISOTP_RET_TIMEOUT      -6
#define ISOTP_RET_LENGTH       -7

/* return logic true if 'a' is after 'b' */
#define IsoTpTimeAfter(a,b) ((int32_t)((int32_t)(b) - (int32_t)(a)) < 0)

/*  invalid bs */
#define ISOTP_INVALID_BS       0xFFFF

/* ISOTP sender status */
typedef enum {
    ISOTP_SEND_STATUS_IDLE,
    ISOTP_SEND_STATUS_INPROGRESS,
    ISOTP_SEND_STATUS_ERROR,
} IsoTpSendStatusTypes;

/* ISOTP receiver status */
typedef enum {
    ISOTP_RECEIVE_STATUS_IDLE,
    ISOTP_RECEIVE_STATUS_INPROGRESS,
    ISOTP_RECEIVE_STATUS_FULL,
} IsoTpReceiveStatusTypes;

/* can fram defination */
#if defined(ISOTP_BYTE_ORDER_LITTLE_ENDIAN)
typedef struct {
    uint8_t reserve_1:4;
    uint8_t type:4;
    uint8_t reserve_2[7];
} IsoTpPciType;

typedef struct {
    uint8_t SF_DL:4;
    uint8_t type:4;
    uint8_t data[7];
} IsoTpSingleFrame;

typedef struct {
    uint8_t FF_DL_high:4;
    uint8_t type:4;
    uint8_t FF_DL_low;
    uint8_t data[6];
} IsoTpFirstFrame;

typedef struct {
    uint8_t SN:4;
    uint8_t type:4;
    uint8_t data[7];
} IsoTpConsecutiveFrame;

typedef struct {
    uint8_t FS:4;
    uint8_t type:4;
    uint8_t BS;
    uint8_t STmin;
    uint8_t reserve[5];
} IsoTpFlowControl;

#else

typedef struct {
    uint8_t type:4;
    uint8_t reserve_1:4;
    uint8_t reserve_2[7];
} IsoTpPciType;

/*
* single frame
* +-------------------------+-----+
* | byte #0                 | ... |
* +-------------------------+-----+
* | nibble #0   | nibble #1 | ... |
* +-------------+-----------+ ... +
* | PCIType = 0 | SF_DL     | ... |
* +-------------+-----------+-----+
*/
typedef struct {
    uint8_t type:4;
    uint8_t SF_DL:4;
    uint8_t data[7];
} IsoTpSingleFrame;

/*
* first frame
* +-------------------------+-----------------------+-----+
* | byte #0                 | byte #1               | ... |
* +-------------------------+-----------+-----------+-----+
* | nibble #0   | nibble #1 | nibble #2 | nibble #3 | ... |
* +-------------+-----------+-----------+-----------+-----+
* | PCIType = 1 | FF_DL                             | ... |
* +-------------+-----------+-----------------------+-----+
*/
typedef struct {
    uint8_t type:4;
    uint8_t FF_DL_high:4;
    uint8_t FF_DL_low;
    uint8_t data[6];
} IsoTpFirstFrame;

/*
* consecutive frame
* +-------------------------+-----+
* | byte #0                 | ... |
* +-------------------------+-----+
* | nibble #0   | nibble #1 | ... |
* +-------------+-----------+ ... +
* | PCIType = 0 | SN        | ... |
* +-------------+-----------+-----+
*/
typedef struct {
    uint8_t type:4;
    uint8_t SN:4;
    uint8_t data[7];
} IsoTpConsecutiveFrame;

/*
* flow control frame
* +-------------------------+-----------------------+-----------------------+-----+
* | byte #0                 | byte #1               | byte #2               | ... |
* +-------------------------+-----------+-----------+-----------+-----------+-----+
* | nibble #0   | nibble #1 | nibble #2 | nibble #3 | nibble #4 | nibble #5 | ... |
* +-------------+-----------+-----------+-----------+-----------+-----------+-----+
* | PCIType = 1 | FS        | BS                    | STmin                 | ... |
* +-------------+-----------+-----------------------+-----------------------+-----+
*/
typedef struct {
    uint8_t type:4;
    uint8_t FS:4;
    uint8_t BS;
    uint8_t STmin;
    uint8_t reserve[5];
} IsoTpFlowControl;

#endif

typedef struct {
    uint8_t ptr[8];
} IsoTpDataArray;

typedef struct {
    union {
        IsoTpPciType          common;
        IsoTpSingleFrame      single_frame;
        IsoTpFirstFrame       first_frame;
        IsoTpConsecutiveFrame consecutive_frame;
        IsoTpFlowControl      flow_control;
        IsoTpDataArray        data_array;
    } as;
} IsoTpCanMessage;

/**************************************************************
 * protocol specific defines
 *************************************************************/

/* Private: Protocol Control Information (PCI) types, for identifying each frame of an ISO-TP message.
 */
typedef enum {
    ISOTP_PCI_TYPE_SINGLE             = 0x0,
    ISOTP_PCI_TYPE_FIRST_FRAME        = 0x1,
    TSOTP_PCI_TYPE_CONSECUTIVE_FRAME  = 0x2,
    ISOTP_PCI_TYPE_FLOW_CONTROL_FRAME = 0x3
} IsoTpProtocolControlInformation;

/* Private: Protocol Control Information (PCI) flow control identifiers.
 */
typedef enum {
    PCI_FLOW_STATUS_CONTINUE = 0x0,
    PCI_FLOW_STATUS_WAIT     = 0x1,
    PCI_FLOW_STATUS_OVERFLOW = 0x2
} IsoTpFlowStatus;

/* Private: network layer resault code.
 */
#define ISOTP_PROTOCOL_RESULT_OK            0
#define ISOTP_PROTOCOL_RESULT_TIMEOUT_A    -1
#define ISOTP_PROTOCOL_RESULT_TIMEOUT_BS   -2
#define ISOTP_PROTOCOL_RESULT_TIMEOUT_CR   -3
#define ISOTP_PROTOCOL_RESULT_WRONG_SN     -4
#define ISOTP_PROTOCOL_RESULT_INVALID_FS   -5
#define ISOTP_PROTOCOL_RESULT_UNEXP_PDU    -6
#define ISOTP_PROTOCOL_RESULT_WFT_OVRN     -7
#define ISOTP_PROTOCOL_RESULT_BUFFER_OVFLW -8
#define ISOTP_PROTOCOL_RESULT_ERROR        -9

#endif