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/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** 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, version 3.
**
** 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 <https://www.gnu.org/licenses/>.
**/
#ifndef ZABBIX_ZBXTRENDS_H
#define ZABBIX_ZBXTRENDS_H
#include "zbxeval.h"
#include "zbxtime.h"
/* value_avg_t structure is used for item average value trend calculations. */
/* */
/* For double values the average value is calculated on the fly with the */
/* following formula: avg = (dbl * count + value) / (count + 1) and stored */
/* into dbl member. */
/* For uint64 values the item values are summed into ui64 member and the */
/* average value is calculated before flushing trends to database: */
/* avg = ui64 / count */
typedef union
{
double dbl;
zbx_uint128_t ui64;
}
zbx_value_avg_t;
typedef struct
{
zbx_uint64_t itemid;
zbx_history_value_t value_min;
zbx_value_avg_t value_avg;
zbx_history_value_t value_max;
int clock;
int num;
int disable_from;
unsigned char value_type;
}
ZBX_DC_TREND;
int zbx_trends_parse_base(const char *params, zbx_time_unit_t *base, char **error);
int zbx_trends_parse_timeshift(time_t from, const char *timeshift, struct tm *tm, char **error);
int zbx_trends_parse_range(time_t from, const char *param, time_t *start, time_t *end, char **error);
int zbx_trends_parse_nextcheck(time_t from, const char *period_shift, time_t *nextcheck, char **error);
int zbx_trends_eval_avg(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,
char **error);
int zbx_trends_eval_count(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,
char **error);
int zbx_trends_eval_max(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,
char **error);
int zbx_trends_eval_min(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,
char **error);
int zbx_trends_eval_sum(const char *table, zbx_uint64_t itemid, time_t start, time_t end, double *value,
char **error);
/* trends function cache */
typedef struct
{
zbx_uint64_t hits;
zbx_uint64_t misses;
zbx_uint64_t items_num;
zbx_uint64_t requests_num;
}
zbx_tfc_stats_t;
int zbx_tfc_init(zbx_uint64_t cache_size, char **error);
void zbx_tfc_destroy(void);
int zbx_tfc_get_stats(zbx_tfc_stats_t *stats, char **error);
void zbx_tfc_invalidate_trends(ZBX_DC_TREND *trends, int trends_num);
int zbx_baseline_get_data(zbx_uint64_t itemid, unsigned char value_type, time_t now, const char *period,
int season_num, zbx_time_unit_t season_unit, int skip, zbx_vector_dbl_t *values,
zbx_vector_uint64_t *index, char **error);
#endif
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