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// SPDX-License-Identifier: GPL-3.0-or-later
#include "median.h"
// ----------------------------------------------------------------------------
// median
struct grouping_median {
size_t series_size;
size_t next_pos;
LONG_DOUBLE series[];
};
void *grouping_create_median(RRDR *r) {
long entries = r->group;
if(entries < 0) entries = 0;
struct grouping_median *g = (struct grouping_median *)callocz(1, sizeof(struct grouping_median) + entries * sizeof(LONG_DOUBLE));
g->series_size = (size_t)entries;
return g;
}
// resets when switches dimensions
// so, clear everything to restart
void grouping_reset_median(RRDR *r) {
struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data;
g->next_pos = 0;
}
void grouping_free_median(RRDR *r) {
freez(r->internal.grouping_data);
r->internal.grouping_data = NULL;
}
void grouping_add_median(RRDR *r, calculated_number value) {
struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data;
if(unlikely(g->next_pos >= g->series_size)) {
error("INTERNAL ERROR: median buffer overflow on chart '%s' - next_pos = %zu, series_size = %zu, r->group = %ld.", r->st->name, g->next_pos, g->series_size, r->group);
}
else {
if(calculated_number_isnumber(value))
g->series[g->next_pos++] = (LONG_DOUBLE)value;
}
}
calculated_number grouping_flush_median(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data;
calculated_number value;
if(unlikely(!g->next_pos)) {
value = 0.0;
*rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
}
else {
if(g->next_pos > 1) {
sort_series(g->series, g->next_pos);
value = (calculated_number)median_on_sorted_series(g->series, g->next_pos);
}
else
value = (calculated_number)g->series[0];
if(!calculated_number_isnumber(value)) {
value = 0.0;
*rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
}
//log_series_to_stderr(g->series, g->next_pos, value, "median");
}
g->next_pos = 0;
return value;
}
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