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#include <string.h>
#include <stdio.h>
#include "dive.h"
struct dive *fixup_dive(struct dive *dive)
{
int i;
double depthtime = 0;
int lasttime = 0;
int start = -1, end = -1;
int startpress = 0, endpress = 0;
int starttemp = 0, endtemp = 0;
int maxdepth = 0, mintemp = 0;
int lastdepth = 0;
for (i = 0; i < dive->samples; i++) {
struct sample *sample = dive->sample + i;
int time = sample->time.seconds;
int depth = sample->depth.mm;
int press = sample->tankpressure.mbar;
int temp = sample->temperature.mkelvin;
if (lastdepth)
end = time;
if (depth) {
if (start < 0)
start = lasttime;
if (depth > maxdepth)
maxdepth = depth;
}
if (press) {
endpress = press;
if (!startpress)
startpress = press;
}
if (temp) {
endtemp = temp;
if (!starttemp)
starttemp = temp;
if (!mintemp || temp < mintemp)
mintemp = temp;
}
depthtime += (time - lasttime) * (lastdepth + depth) / 2;
lastdepth = depth;
lasttime = time;
}
if (end < 0)
return dive;
dive->duration.seconds = end - start;
if (start != end)
dive->meandepth.mm = depthtime / (end - start);
if (startpress)
dive->beginning_pressure.mbar = startpress;
if (endpress)
dive->end_pressure.mbar = endpress;
if (mintemp)
dive->watertemp.mkelvin = mintemp;
if (maxdepth)
dive->maxdepth.mm = maxdepth;
return dive;
}
/* Don't pick a zero for MERGE_MIN() */
#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MERGE_MAX(res, a, b, n) res->n = MAX(a->n, b->n)
#define MERGE_MIN(res, a, b, n) res->n = (a->n)?(b->n)?MIN(a->n, b->n):(a->n):(b->n)
static int alloc_samples;
static struct dive *add_sample(struct sample *sample, int time, struct dive *dive)
{
int nr = dive->samples;
struct sample *d;
if (nr >= alloc_samples) {
alloc_samples = (alloc_samples + 64) * 3 / 2;
dive = realloc(dive, dive_size(alloc_samples));
if (!dive)
return NULL;
}
dive->samples = nr+1;
d = dive->sample + nr;
*d = *sample;
d->time.seconds = time;
return dive;
}
/*
* Merge samples. Dive 'a' is "offset" seconds before Dive 'b'
*/
static struct dive *merge_samples(struct dive *res, struct dive *a, struct dive *b, int offset)
{
int asamples = a->samples;
int bsamples = b->samples;
struct sample *as = a->sample;
struct sample *bs = b->sample;
for (;;) {
int at, bt;
struct sample sample;
if (!res)
return NULL;
at = asamples ? as->time.seconds : -1;
bt = bsamples ? bs->time.seconds + offset : -1;
/* No samples? All done! */
if (at < 0 && bt < 0)
return fixup_dive(res);
/* Only samples from a? */
if (bt < 0) {
add_sample_a:
res = add_sample(as, at, res);
as++;
asamples--;
continue;
}
/* Only samples from b? */
if (at < 0) {
add_sample_b:
res = add_sample(bs, bt, res);
bs++;
bsamples--;
continue;
}
if (at < bt)
goto add_sample_a;
if (at > bt)
goto add_sample_b;
/* same-time sample: add a merged sample. Take the non-zero ones */
sample = *bs;
if (as->depth.mm)
sample.depth = as->depth;
if (as->temperature.mkelvin)
sample.temperature = as->temperature;
if (as->tankpressure.mbar)
sample.tankpressure = as->tankpressure;
if (as->tankindex)
sample.tankindex = as->tankindex;
res = add_sample(&sample, at, res);
as++;
bs++;
asamples--;
bsamples--;
}
}
static char *merge_text(const char *a, const char *b)
{
char *res;
if (!a || !*a)
return (char *)b;
if (!b || !*b)
return (char *)a;
if (!strcmp(a,b))
return (char *)a;
res = malloc(strlen(a) + strlen(b) + 9);
if (!res)
return (char *)a;
sprintf(res, "(%s) or (%s)", a, b);
return res;
}
/*
* This could do a lot more merging. Right now it really only
* merges almost exact duplicates - something that happens easily
* with overlapping dive downloads.
*/
struct dive *try_to_merge(struct dive *a, struct dive *b)
{
int i;
struct dive *res;
if (a->when != b->when)
return NULL;
alloc_samples = 5;
res = malloc(dive_size(alloc_samples));
if (!res)
return NULL;
memset(res, 0, dive_size(alloc_samples));
res->when = a->when;
res->name = merge_text(a->name, b->name);
res->location = merge_text(a->location, b->location);
res->notes = merge_text(a->notes, b->notes);
MERGE_MAX(res, a, b, maxdepth.mm);
res->meandepth.mm = 0;
MERGE_MAX(res, a, b, duration.seconds);
MERGE_MAX(res, a, b, surfacetime.seconds);
MERGE_MAX(res, a, b, airtemp.mkelvin);
MERGE_MIN(res, a, b, watertemp.mkelvin);
MERGE_MAX(res, a, b, beginning_pressure.mbar);
MERGE_MAX(res, a, b, end_pressure.mbar);
for (i = 0; i < MAX_MIXES; i++) {
if (a->gasmix[i].o2.permille) {
res->gasmix[i] = a->gasmix[i];
continue;
}
res->gasmix[i] = b->gasmix[i];
}
return merge_samples(res, a, b, 0);
}
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