/**
 * @file cmd.c
 * @author xxx
 * @date 2023-06-25 13:07:02
 * @brief 命令解析器
 * @copyright Copyright (c) 2023 by xxx, All Rights Reserved.
 */

#include "cmd.h"

#include <stdio.h>

static cmd_t *_cmd_begin, *_cmd_end;

static int _cmd_to_lower(int c)
{
    if ((c >= 'A') && (c <= 'Z'))
        return c + ('a' - 'A');
    return c;
}

static unsigned int _cmd_hash(const char *str)
{
    int tmp, c = *str;
    unsigned int seed = CMD_HASH; /* 'jiejie' string hash */
    unsigned int hash = 0;

    while (*str)
    {
        tmp = _cmd_to_lower(c);
        hash = (hash ^ seed) + tmp;
        str++;
        c = *str;
    }
    return hash;
}

static void _cmd_init(const void *begin, const void *end)
{
    _cmd_begin = (cmd_t *)begin;
    _cmd_end = (cmd_t *)end;
}

static cmd_t *_get_next_cmd(cmd_t *cmd)
{
    unsigned int *ptr;
    ptr = (unsigned int *)(cmd + 1);
    while ((*ptr == 0) && ((unsigned int *)ptr < (unsigned int *)_cmd_end))
        ptr++;

    return (cmd_t *)ptr;
}

static int _cmd_match(const char *str, const char *cmd)
{
    int c1, c2;

    do
    {
        c1 = _cmd_to_lower(*str++);
        c2 = _cmd_to_lower(*cmd++);
    } while ((c1 == c2) && c1);

    return c1 - c2;
}

static void _list(void)
{
    cmd_t *index;
    for (index = _cmd_begin; index < _cmd_end; index = _get_next_cmd(index))
    {
        // printf("%s -->%s\n", index->cmd, index->cmd_mess);
    }
}
REGISTER_CMD(_list, _list, list all command);

void cmd_init(void)
{
    cmd_t *index;

#if defined(__CC_ARM) || defined(__CLANG_ARM) /* ARM C Compiler */
    extern const int CMDS$$Base;
    extern const int CMDS$$Limit;
    _cmd_init(&CMDS$$Base, &CMDS$$Limit);
#elif defined(__ICCARM__) || defined(__ICCRX__) /* for IAR Compiler */
    _cmd_init(__section_begin("CMDS"), __section_end("CMDS"));
#endif

    for (index = _cmd_begin; index < _cmd_end; index = _get_next_cmd(index))
    {
        index->hash = _cmd_hash(index->cmd);
    }
}

void cmd_parsing(char *str)
{
    cmd_t *index;
    unsigned int hash = _cmd_hash(str);

    for (index = _cmd_begin; index < _cmd_end; index = _get_next_cmd(index))
    {
        if (hash == index->hash)
        {
            if (_cmd_match(str, index->cmd) == 0)
            {
                index->handler();
                break;
            }
        }
    }
}