timeband.h

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#pragma once
#include <stdbool.h>
#include <time.h>


#define TIMEBAND_DAY_MINUTES 1440

typedef struct
{
    int start_min;  
    int span_min;   
} TimeBand;

TimeBand timeband_full_day(void);

TimeBand timeband_rolling(int now_min, int span_min, int lead_min);

TimeBand timeband_from_hour(int base_hour, int span_min);

int timeband_offset(TimeBand band, int minute_of_day);

int timeband_pos(TimeBand band, int length, int minute_of_day);

int timeband_pos_offset(TimeBand band, int length, int offset_min);

typedef struct
{
    int  from;          
    int  to;            
    bool clipped_start; 
    bool clipped_end;   
} TimeBandSpan;

bool timeband_clip(TimeBand band, time_t window_epoch, time_t start, time_t end,
                   TimeBandSpan *out);

int timeband_clip_daily(TimeBand band, int from_min, int to_min,
                        TimeBandSpan *out, int max_out);

time_t timeband_window_epoch(TimeBand band, time_t now, int now_min);