#include "rtc.h"

#include "hal_interface.h"
#include "regs.h"


extern RTC_HandleTypeDef hrtc;

extern void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc) {
	uint8_t rtc_conf = reg_get_value(REG_ID_RTC_CFG);
	RTC_DateTypeDef date_s = {0};
	uint8_t date_valid = 1;

	if ((rtc_conf & RTC_CFG_DATE_ALARM) == RTC_CFG_DATE_ALARM) {
		HAL_RTC_GetDate(hrtc, &date_s, RTC_FORMAT_BIN);
		if (date_s.Year != rtc_alarm_date._s.Year ||
			date_s.Month != rtc_alarm_date._s.Month ||
			date_s.Date != rtc_alarm_date._s.Date)
				date_valid = 0;
	}

	rtc_stop_alarm();
	if (date_valid == 1) {
		if ((rtc_conf & RTC_CFG_REARM) == RTC_CFG_REARM)
			rtc_run_alarm();
	} else {
		rtc_run_alarm();
	}
}

void i2cs_fill_buffer_RTC_date(uint8_t* const date_buff, const volatile RTC_DateTypeDef* const date_s) {
	if (date_s == NULL || date_buff == NULL)
		return;

	date_buff[0] = date_s->Year;
	date_buff[1] = date_s->Month;
	date_buff[2] = date_s->Date;
	date_buff[3] = date_s->WeekDay;
}

void i2cs_fill_buffer_RTC_time(uint8_t* const time_buff, const volatile RTC_TimeTypeDef* const time_s) {
	if (time_s == NULL || time_buff == NULL)
		return;

	time_buff[0] = time_s->Hours;
	time_buff[1] = time_s->Minutes;
	time_buff[2] = time_s->Seconds;
}

void i2cs_RTC_date_from_buffer(volatile RTC_DateTypeDef* const date_s, const uint8_t* const date_buff) {
	if (date_s == NULL || date_buff == NULL)
		return;

	date_s->Year = date_buff[0] <= 99? date_buff[0] : 99;
	date_s->Month = (date_buff[1] > 0 && date_buff[1] <= 12)? date_buff[1] : 12;
	date_s->Date = (date_buff[2] > 0 && date_buff[2] <= 99)? date_buff[2] : 99;
	//data_s.WeekDay - this element is automatically recomputed
}

void i2cs_RTC_time_from_buffer(volatile RTC_TimeTypeDef* const time_s, const uint8_t* const time_buff) {
	if (time_s == NULL || time_buff == NULL)
		return;

	time_s->Hours = time_buff[0] <= 23 ? time_buff[0] : 23;
	time_s->Minutes = time_buff[1] <= 59 ? time_buff[1] : 59;
	time_s->Seconds = time_buff[2] <= 59 ? time_buff[2] : 59;
}

inline uint32_t rtc_run_alarm(void) {
	RTC_AlarmTypeDef alarm_s;

	alarm_s.Alarm = RTC_ALARM_A;
	alarm_s.AlarmTime.Hours = rtc_alarm_time._s.Hours;
	alarm_s.AlarmTime.Minutes = rtc_alarm_time._s.Minutes;
	alarm_s.AlarmTime.Seconds = rtc_alarm_time._s.Seconds;
	return (uint32_t)HAL_RTC_SetAlarm_IT(&hrtc, &alarm_s, RTC_FORMAT_BIN);
}

inline uint32_t rtc_stop_alarm(void) {
	return (uint32_t)HAL_RTC_DeactivateAlarm(&hrtc, RTC_ALARM_A);
}