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/* SPDX-License-Identifier: MIT-0 */
#include <assert.h>
#include <math.h>
#include "schedule.h"
#define STOPLEN_ROUGH 10
#define STOPLEN_FINE 1
int SWITCH_INTERMEDIATE = SWITCH_INTERMEDIATE_DEFAULT;
const gas_t *best_gas(const double depth, const gas_t *gasses, const int nof_gasses)
{
const gas_t *best = NULL;
double mod_best = -1;
for (int i = 0; i < nof_gasses; i++) {
double mod = gas_mod(&gasses[i]);
if (depth - mod < 1E-2 && (mod_best == -1 || mod < mod_best)) {
best = &gasses[i];
mod_best = mod;
}
}
return best;
}
int direct_ascent(const decostate_t *ds, const double depth, const double time, const gas_t *gas)
{
decostate_t ds_ = *ds;
assert(ds_.firststop == -1);
add_segment_ascdec(&ds_, depth, abs_depth(0), time, gas);
return gauge_depth(ceiling(&ds_, ds_.gfhi)) <= 0;
}
void simulate_dive(decostate_t *ds, waypoint_t *waypoints, const int nof_waypoints, waypoint_callback_t *wp_cb)
{
double depth = abs_depth(0);
for (int i = 0; i < nof_waypoints; i++) {
double d = waypoints[i].depth;
double t = waypoints[i].time;
const gas_t *g = waypoints[i].gas;
if (d != depth)
add_segment_ascdec(ds, depth, d, t, g);
else
add_segment_const(ds, d, t, g);
depth = d;
if (wp_cb && wp_cb->fn)
wp_cb->fn(ds, (waypoint_t){.depth = d, .time = t, .gas = g}, SEG_DIVE, wp_cb->arg);
}
}
double calc_ndl(decostate_t *ds, const double depth, const double ascrate, const gas_t *gas)
{
double ndl = 0;
/* rough steps */
decostate_t ds_ = *ds;
while (ndl < 360) {
double tmp = add_segment_const(&ds_, depth, STOPLEN_ROUGH, gas);
if (!direct_ascent(&ds_, depth, gauge_depth(depth) / ascrate, gas))
break;
ndl += tmp;
}
/* fine steps */
ds_ = *ds;
if (ndl)
add_segment_const(&ds_, depth, ndl, gas);
while (ndl < 360) {
double tmp = add_segment_const(&ds_, depth, STOPLEN_FINE, gas);
if (!direct_ascent(&ds_, depth, gauge_depth(depth) / ascrate, gas))
break;
ndl += tmp;
}
return ndl;
}
double deco_stop(decostate_t *ds, const double depth, const double next_stop, const double current_gf,
const gas_t *gas)
{
double stoplen = 0;
/* rough steps */
decostate_t ds_ = *ds;
for (;;) {
double tmp = add_segment_const(&ds_, depth, STOPLEN_ROUGH, gas);
if (ceiling(&ds_, current_gf) <= next_stop)
break;
stoplen += tmp;
}
if (stoplen)
add_segment_const(ds, depth, stoplen, gas);
/* fine steps */
while (ceiling(ds, current_gf) > next_stop)
stoplen += add_segment_const(ds, depth, STOPLEN_FINE, gas);
return stoplen;
}
static int surfaced(const double depth)
{
return fabs(depth - SURFACE_PRESSURE) < 1E-2;
}
decoinfo_t calc_deco(decostate_t *ds, const double start_depth, const gas_t *start_gas, const gas_t *deco_gasses,
const int nof_gasses, waypoint_callback_t *wp_cb)
{
decoinfo_t ret = {.tts = 0, .ndl = 0};
/* setup start parameters */
double depth = start_depth;
const gas_t *gas = start_gas;
const double asc_per_min = msw_to_bar(9);
/* check if direct ascent is possible */
if (direct_ascent(ds, depth, gauge_depth(depth) / asc_per_min, gas)) {
ret.ndl = calc_ndl(ds, depth, asc_per_min, gas);
return ret;
}
double next_stop = abs_depth(ds->ceil_multiple * (ceil(gauge_depth(depth) / ds->ceil_multiple) - 1));
double current_gf = get_gf(ds, next_stop);
for (;;) {
/* extra bookkeeping because waypoints and segments do not match 1:1 */
double last_waypoint_depth = depth;
double waypoint_time;
while (ceiling(ds, current_gf) < next_stop && !surfaced(depth)) {
/* switch to better gas if available */
const gas_t *best = best_gas(depth, deco_gasses, nof_gasses);
if (SWITCH_INTERMEDIATE && best && best != gas) {
/* emit waypoint */
waypoint_time = fabs(last_waypoint_depth - depth) / asc_per_min;
if (wp_cb && wp_cb->fn)
wp_cb->fn(ds, (waypoint_t){.depth = depth, .time = waypoint_time, .gas = gas}, SEG_TRAVEL,
wp_cb->arg);
last_waypoint_depth = depth;
/* switch gas */
gas = best;
ret.tts += add_segment_const(ds, depth, 1, gas);
if (wp_cb && wp_cb->fn)
wp_cb->fn(ds, (waypoint_t){.depth = depth, .time = 1, .gas = gas}, SEG_GAS_SWITCH, wp_cb->arg);
continue;
}
/* ascend to next stop */
ret.tts += add_segment_ascdec(ds, depth, next_stop, fabs(depth - next_stop) / asc_per_min, gas);
depth = next_stop;
/* make next stop shallower */
next_stop -= ds->ceil_multiple;
if (LAST_STOP_AT_SIX && next_stop < abs_depth(msw_to_bar(6)))
next_stop = SURFACE_PRESSURE;
/* recalculate gf */
current_gf = get_gf(ds, next_stop);
}
if (ds->firststop == -1) {
ds->firststop = depth;
/*
* if the first stop wasn't know yet during the previous call to
* get_gf, the result was inaccurate and needs to be recalculated
*/
current_gf = get_gf(ds, next_stop);
/* if the new gf also allows us to ascend further, continue ascending */
if (ceiling(ds, current_gf) < next_stop)
continue;
}
/* emit waypoint */
waypoint_time = fabs(last_waypoint_depth - depth) / asc_per_min;
enum segtype_t segtype = surfaced(depth) ? SEG_SURFACE : SEG_TRAVEL;
if (wp_cb && wp_cb->fn && waypoint_time)
wp_cb->fn(ds, (waypoint_t){.depth = depth, .time = waypoint_time, .gas = gas}, segtype, wp_cb->arg);
/* terminate if we surfaced */
if (surfaced(depth))
return ret;
/* switch to better gas if available */
const gas_t *best = best_gas(depth, deco_gasses, nof_gasses);
if (best)
gas = best;
/* stop until ceiling rises above next stop */
double stoplen = deco_stop(ds, depth, next_stop, current_gf, gas);
ret.tts += stoplen;
if (wp_cb && wp_cb->fn)
wp_cb->fn(ds, (waypoint_t){.depth = depth, .time = stoplen, .gas = gas}, SEG_DECO_STOP, wp_cb->arg);
}
}
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