#ifndef WORLD_DAYCYCLE_H
#define WORLD_DAYCYCLE_H

/* In-game clock driving sun position and light colors. */

#include <stddef.h>

#include "render/renderer.h"

typedef struct {
    float    seconds;     /* seconds since midnight, 0..86400 */
    float    time_scale;  /* game seconds per real second */
    float    day_start;   /* sunrise hour */
    float    day_end;     /* sunset hour */
    Lighting light;       /* derived from the time of day */
} DayCycle;

void DayCycle_init(DayCycle *dc, float start_hour, float time_scale);
void DayCycle_update(DayCycle *dc, float dt);

/* Writes "HH:MM:SS". */
void DayCycle_format(const DayCycle *dc, char *out, size_t out_size);

#endif /* WORLD_DAYCYCLE_H */