/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*  Gem-graph client                                                            *
*  Finite State Machine - Journal                                              *
*                                                                              *
*  Copyright © 2024 Libre en Communs <contact@a-lec.org>                       *
*  Copyright © 2024 Jean Sirmai <jean@a-lec.org>                               *
*                                                                              *
*  This file is part of Gem-graph.                                             *
*                                                                              *
*  This program is free software: you can redistribute it and/or modify it     *
*  under the terms of the GNU Affero General Public License                    *
*  as published by the Free Software Foundation,                               *
*  either version 3 of the License,                                            *
*  or (at your option) any later version.                                      *
*                                                                              *
*  This program is distributed in the hope that it will be useful,             *
*  but WITHOUT ANY WARRANTY;                                                   *
*  without even the implied warranty of MERCHANTABILITY                        *
*  or FITNESS FOR A PARTICULAR PURPOSE.                                        *
*  See the GNU Affero General Public License for more details.                 *
*                                                                              *
*  You should have received a copy of the GNU Affero General Public License    *
*  along with this program.  If not, see <http://www.gnu.org/licenses/>.       *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

//#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <sys/time.h>
#include "../include/fsm.h"

/******************************************************************************/
/*               A journal stores chronologically the events                  */
/*               during a session run   (rules exec, mainly)                  */
/******************************************************************************/

/* 2024-09-22
 * What types of events should be reported ?  (fsm, widgets, ... )
 * For what purpose ?
 * What information must be collected and transmitted ?
 * How do you name and classify this information ?
 * How do you present it ?
 *
 * date   clé (rank)   fichier source   fonction source   +/- valeur  */


/*
    time_t current_time = time(NULL);
    // Check if the time retrieval was successful
    if (current_time == ((time_t)-1)) printf("Error getting current time.\n");
    // Convert to local time format and print
    printf("    Current timestamp: %ld  %s\n", current_time, message);
    printf("    Current time: %s", ctime(&current_time));
*/

void fsm_journal_init (journal *jj)
{
    jj->first = NULL;
    jj->last = NULL;
}

void fsm_journal_clear (journal *jj,
                        const char *file_source,
                        const char *function_source,
                        const char *string_value)
{
   unit *tmp;
   unit *a_unit = jj->first;
   while(a_unit)
   {
     tmp = a_unit;
     a_unit = a_unit->next;
     free (tmp);
   }
   jj->first = NULL;
   jj->last = NULL;
}

void fsm_journal_push_front (journal *jj,
                             const char *file_source,
                             const char *function_source,
                             const char *string_value)
{
    struct timeval tv;
    gettimeofday (&tv, NULL);
    unit *new_unit = malloc (sizeof(unit));
    if (! new_unit) exit (EXIT_FAILURE);

    new_unit->yy_dd_mm = tv.tv_sec;
    new_unit->usec = tv.tv_usec;
    new_unit->file_source = file_source;
    new_unit->function_source = function_source;
    new_unit->string_value = string_value;

    new_unit->next = jj->first;
    new_unit->prev = NULL;
    if (jj->first) jj->first->prev = new_unit;
    else jj->last = new_unit;
    jj->first = new_unit;
}

long fsm_journal_pop_back (journal *jj,
                           const char *file_source,
                           const char *function_source,
                           const char *string_value)
{
    long usec;
    unit *tmp = jj->last;
    if (! tmp) return -1;
    usec = tmp->usec;
    jj->last = tmp->prev;
    if (jj->last) jj->last->next = NULL;
    else jj->first = NULL;
    free (tmp);
    return usec;      // retourne l'évènement retiré du journal.
}

int fsm_journal_length (journal jj)
{
    unit *a_unit = jj.first;
    int nb = 0;
    while (a_unit)
    {
        nb ++;
        a_unit = a_unit->next;
    }
    //  printf ("fsm journal length  = %d\n", nb);
    return nb;
}

void fsm_journal_seek (journal jj, long usec,
                       const char *file_source,
                       const char *function_source,
                       const char *string_value)
{
    unit *a_unit = jj.first;
    int nb = 0;
    while (a_unit)
    {
        if (usec == a_unit->usec) nb++;
        a_unit = a_unit->next;
    }
    if (nb > 0)  printf ("> date (usec) %ld found %d times in journal\n", usec, nb);
    else         printf ("> date (usec) %ld not found in journal\n", usec);
}


//------------------------------------------------------------------------------
        // ref:   sudo cat /var/log/messages
        // Format time, "ddd yyyy-mm-dd hh:mm:ss zzz"    "%Y-%m-%d %H:%M:%S"
        // https://www.man7.org/linux/man-pages/man3/strftime.3.html
        // https://en.cppreference.com/w/c/io/fprintf
        // https://nicolasj.developpez.com/articles/libc/string/
        // https://thelinuxcode.com/pass-string-function-c-language/
        // https://mefics.org/fr/allocation-dynamique-de-m%C3%A9moire-en-c-fonctions-malloc-calloc/
//------------------------------------------------------------------------------

void fsm_journal_publish (journal jj)
{
    unit *a_unit = jj.last;
    char buf [JOURNAL_LOG_MAX_LENGTH];
    int nb = 0;
    while (a_unit)
    {
        strftime(buf, sizeof(buf), "%D %T", localtime(&a_unit->yy_dd_mm));
        g_message ("%s + %-6ld  %6d    %-32s %-38s %-50s",
                   buf,
                   a_unit->usec,
                   nb,
                   a_unit->file_source,
                   a_unit->function_source,
                   a_unit->string_value);
        a_unit = a_unit->prev;
        nb ++;
    }
}