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/* divesite.c */
#include "divesite.h"
#include "dive.h"
#include <math.h>
struct dive_site_table dive_site_table;
/* there could be multiple sites of the same name - return the first one */
uint32_t get_dive_site_uuid_by_name(const char *name, struct dive_site **dsp)
{
int i;
struct dive_site *ds;
for_each_dive_site (i, ds) {
if (same_string(ds->name, name)) {
if (dsp)
*dsp = ds;
return ds->uuid;
}
}
return 0;
}
/* there could be multiple sites at the same GPS fix - return the first one */
uint32_t get_dive_site_uuid_by_gps(degrees_t latitude, degrees_t longitude, struct dive_site **dsp)
{
int i;
struct dive_site *ds;
for_each_dive_site (i, ds) {
if (ds->latitude.udeg == latitude.udeg && ds->longitude.udeg == longitude.udeg) {
if (dsp)
*dsp = ds;
return ds->uuid;
}
}
return 0;
}
// Calculate the distance in meters between two coordinates.
static unsigned int get_distance(degrees_t lat1, degrees_t lon1, degrees_t lat2, degrees_t lon2)
{
double lat1_r = udeg_to_radians(lat1.udeg);
double lat2_r = udeg_to_radians(lat2.udeg);
double lat_d_r = udeg_to_radians(lat2.udeg-lat1.udeg);
double lon_d_r = udeg_to_radians(lon2.udeg-lon1.udeg);
double a = sin(lat_d_r/2) * sin(lat_d_r/2) +
cos(lat2_r) * cos(lat2_r) * sin(lon_d_r/2) * sin(lon_d_r/2);
double c = 2 * atan2(sqrt(a), sqrt(1.0 - a));
// Earth radious in metres
return 6371000 * c;
}
/* find the closest one, no more than distance meters away - if more than one at same distance, pick the first */
uint32_t get_dive_site_uuid_by_gps_proximity(degrees_t latitude, degrees_t longitude, int distance, struct dive_site **dsp)
{
int i;
int uuid = 0;
struct dive_site *ds;
unsigned int cur_distance, min_distance = distance;
for_each_dive_site (i, ds) {
if (dive_site_has_gps_location(ds) &&
(cur_distance = get_distance(ds->latitude, ds->longitude, latitude, longitude)) < min_distance) {
min_distance = cur_distance;
uuid = ds->uuid;
if (dsp)
*dsp = ds;
}
}
return uuid;
}
/* try to create a uniqe ID - fingers crossed */
static uint32_t dive_site_getUniqId()
{
uint32_t id = 0;
while (id == 0 || get_dive_site_by_uuid(id)) {
id = rand() & 0xff;
id |= (rand() & 0xff) << 8;
id |= (rand() & 0xff) << 16;
id |= (rand() & 0xff) << 24;
}
return id;
}
struct dive_site *alloc_dive_site()
{
int nr = dive_site_table.nr, allocated = dive_site_table.allocated;
struct dive_site **sites = dive_site_table.dive_sites;
if (nr >= allocated) {
allocated = (nr + 32) * 3 / 2;
sites = realloc(sites, allocated * sizeof(struct dive_site *));
if (!sites)
exit(1);
dive_site_table.dive_sites = sites;
dive_site_table.allocated = allocated;
}
struct dive_site *ds = calloc(1, sizeof(*ds));
if (!ds)
exit(1);
sites[nr] = ds;
dive_site_table.nr = nr + 1;
ds->uuid = dive_site_getUniqId();
return ds;
}
void delete_dive_site(uint32_t id)
{
int nr = dive_site_table.nr;
for (int i = 0; i < nr; i++) {
struct dive_site *ds = get_dive_site(i);
if (ds->uuid == id) {
free(ds->name);
free(ds->notes);
free(ds);
if (nr - 1 > i)
memmove(&dive_site_table.dive_sites[i],
&dive_site_table.dive_sites[i+1],
(nr - 1 - i) * sizeof(dive_site_table.dive_sites[0]));
dive_site_table.nr = nr - 1;
break;
}
}
}
/* allocate a new site and add it to the table */
uint32_t create_dive_site(const char *name)
{
struct dive_site *ds = alloc_dive_site();
ds->name = copy_string(name);
return ds->uuid;
}
/* same as before, but with GPS data */
uint32_t create_dive_site_with_gps(const char *name, degrees_t latitude, degrees_t longitude)
{
struct dive_site *ds = alloc_dive_site();
ds->name = copy_string(name);
ds->latitude = latitude;
ds->longitude = longitude;
return ds->uuid;
}
/* a uuid is always present - but if all the other fields are empty, the dive site is pointless */
bool dive_site_is_empty(struct dive_site *ds)
{
return same_string(ds->name, "") &&
same_string(ds->description, "") &&
same_string(ds->notes, "") &&
ds->latitude.udeg == 0 &&
ds->longitude.udeg == 0;
}
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