/*********************************************************************************
 *      Copyright:  (C) 2023 LingYun IoT System Studio.
 *                  All rights reserved.
 *
 *       Filename:  pack_seg.c
 *    Description:  This file is segement format string package and parser example
 *
 *        Version:  1.0.0(2023年07月10日)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2023年07月10日 16时34分49秒"
 *
 ********************************************************************************/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>


#define CONFIG_DEBUG

#ifdef CONFIG_DEBUG
#define dbg_print(format, args...)  printf(format, ##args)
#else
#define dbg_print(format, args...)  do {} while(0)
#endif

#define DEVSN_LEN     11

typedef struct data_s
{
    char        devsn[DEVSN_LEN+1];
    char        time[32];
    float       temp;
    float       rh;
} pack_t;


int pack_seg(char *buf, int size, char *devsn, char *time, float temp, float rh);
int unpack_seg(char *buf, int len, pack_t *pack);

int main (int argc, char **argv)
{
    char         buf[512];
    char        *devsn="ISK1023001";
    char        *time="2023-07-10 20:00:00";
    float        temp = 20.50;
    float        rh = 30.50;
    pack_t       data;
    int          rv;

    if( (rv=pack_seg(buf, sizeof(buf), devsn, time, temp, rh)) < 0 )
    {
        printf("Package sample data message failed, rv=%d\n", rv);
        return rv;
    }

    if( (rv=unpack_seg(buf, rv, &data)) < 0 )
    {
        printf("Parser sample data message failed, rv=%d\n", rv);
        return rv;
    }


    return 0;
}


int pack_seg(char *buf, int size, char *devsn, char *time, float temp, float rh)
{
    if( !buf || size<=0 || !devsn || !time )
    {
        printf("\033[1;31m%s:%d %s() Invalid input arguments\033[0m\n", __FILE__, __LINE__, __func__);
        return -1;
    }

    memset(buf, 0, size);
    snprintf(buf, size, "%s,%s,%.2f,%.2f", devsn, time, temp, rh);

    dbg_print("\033[1;32mPacket Message: %s\033[0m\n", buf);

    return strlen(buf);
}


int unpack_seg(char *buf, int len, pack_t *pack)
{
    char      *ptr_start = NULL;
    char      *ptr_end = NULL;
    int        bytes;

    if( !buf || len<=0 || !pack )
    {
        printf("\033[1;31m%s:%d %s() Invalid input arguments\033[0m\n", __FILE__, __LINE__, __func__);
        return -1;
    }

    dbg_print("\033[1;33mParser Message: %s\033[0m\n", buf);

    if( !(ptr_start=strstr(buf, "ISK")) )
    {
        printf("ERROR: Device SN not found\n");
        return -2;
    }

    memset(pack, 0, sizeof(*pack));

    /*+--------------------------+
     *| Start parser SN segement |
     *+--------------------------+*/

    if( !(ptr_end=strchr(ptr_start, ',')) )
    {
        printf("ERROR: Package not integrated \n");
        return -2;
    }

    bytes = ptr_end - ptr_start;
    bytes = bytes>DEVSN_LEN ? DEVSN_LEN : bytes;

    memcpy(pack->devsn, ptr_start, bytes);
    printf("Found devsn      : %s\n", pack->devsn);

    /*+----------------------------+
     *| Start parser Time segement |
     *+----------------------------+*/

    ptr_start = ptr_end+1;

    if( !(ptr_end=strchr(ptr_start, ',')) )
    {
        printf("ERROR: Package not integrated \n");
        return -2;
    }

    bytes = ptr_end - ptr_start;
    bytes = bytes>sizeof(pack->time) ? sizeof(pack->time) : bytes;

    memcpy(pack->time, ptr_start, bytes);
    printf("Found time       : %s\n", pack->time);


    /*+--------------------------+
     *| Start parser temperature |
     *+--------------------------+*/

    ptr_start = ptr_end+1;

    if( !(ptr_end=strchr(ptr_start, ',')) )
    {
        printf("ERROR: Package not integrated \n");
        return -2;
    }

    *ptr_end='\0';
    pack->temp = atof(ptr_start);
    *ptr_end=',';

    printf("Found temperature: %.2f\n", pack->temp);

    /*+-----------------------+
     *| Start parser humidity |
     *+-----------------------+*/

    ptr_start = ptr_end+1;

    if( !(ptr_end=strchr(ptr_start, '\0')) )
    {
        printf("ERROR: Package not integrated \n");
        return -2;
    }

    pack->temp = atof(ptr_start);
    printf("Found humidity   : %.2f\n", pack->temp);

    return 0;
}