#pragma once

#include "allocator.h"

#include <stdint.h>

#define HMD_SEC_SPN (1)
#define HMD_MIN_SPN (60)
#define HMD_HOUR_SPN (HMD_MIN_SPN * 60)
#define HMD_DAY_SPN (HMD_HOUR_SPN * 24)
#define HMD_WEEK_SPN (HMD_DAY_SPN * 7)

enum hmd_err {
	HMD_OK = 0,
	HMD_ERR_OOB,
	HMD_ERR_FMT,
	HMD_ERR_SYS,
	HMD_ERR_ARG,
	HMD_ERR_INT
};

enum hmd_mon {
	HMD_JAN,
	HMD_FEB,
	HMD_MAR,
	HMD_APR,
	HMD_MAY,
	HMD_JUN,
	HMD_JUL,
	HMD_AUG,
	HMD_SEP,
	HMD_OCT,
	HMD_NOV,
	HMD_DEC
};

enum hmd_wday {
	HMD_SUN,
	HMD_MON,
	HMD_TUE,
	HMD_WED,
	HMD_THU,
	HMD_FRI,
	HMD_SAT,
};

struct hmd_spn {
	uint32_t years;
	uint32_t weeks;
	uint32_t days;
	uint32_t hours;
	uint32_t mins;
	uint32_t secs;
};

struct hmd_date {
	uint64_t ts; /* unix epoch */
	uint64_t spn;
};

struct hmd_dd {
	uint16_t year;
	uint8_t month;
	uint8_t day;
};

struct hmd_tod {
	uint8_t hour;
	uint8_t min;
	uint8_t sec;
	uint16_t spn;
};

enum hmd_err hmd_spn_parse(struct hmd_spn *spn, const char *arg);
enum hmd_err hmd_spn_ival_parse(struct hmd_spn *spn, const char *arg);

enum hmd_err hmd_spn_calc(struct hmd_spn *spn, uint64_t start, uint64_t end);
uint64_t hmd_spn_secs(struct hmd_spn *spn);

char *hmd_spn_str(struct hmd_spn *spn,
	const struct allocator *allocator, int *rc);
char *hmd_spn_ival_str(struct hmd_spn *spn,
	const struct allocator *allocator, int *rc);

enum hmd_err hmd_date_parse_daydate_reltime_weekday(
	struct hmd_date *date, char *arg);
enum hmd_err hmd_date_parse_daydate_reltime_coarse(
	struct hmd_date *date, char *arg);
enum hmd_err hmd_date_parse_daydate_iso8601(struct hmd_date *date, char *arg);
enum hmd_err hmd_timeofday_parse(struct hmd_tod *tod, char *arg);
enum hmd_err hmd_date_parse(struct hmd_date *date, char *arg);

char *hmd_date_str_reltime_exact(struct hmd_date *date,
	const struct allocator *allocator, int *rc);
char *hmd_date_str_reltime_coarse(struct hmd_date *date,
	const struct allocator *allocator, int *rc);
char *hmd_date_str_iso8601(struct hmd_date *date,
	const struct allocator *allocator, int *rc);
char *hmd_date_str(struct hmd_date *date,
	const struct allocator *allocator, int *rc);

extern const char *hmd_wdnames[7];
extern const char *hmd_mnames[12];
extern const int hmd_mdays[12];