#include <stdint.h>
#include <avr/io.h>
#include <avr/interrupt.h>

#include "clock.h"


volatile clock_t clock;
volatile opTime_t opTime;

volatile uint8_t useLocalClock = 1;

volatile uint8_t nextSecond = 0;
volatile uint8_t nextMinute = 0;
volatile uint8_t tack = 0;
volatile uint8_t step = 0;




void clockInit() {
  clock.hour = 0;
  clock.minute = 0;
  clock.second = 0;

  opTime.hour = 0;
  opTime.minute = 0;
  opTime.second = 0;

  // seconds
  TCCR2 = 0b00000101;
  ASSR |= (1 << AS2);
  TIMSK |= (1 << TOIE2) | (1 << TICIE1);

  // heartbeat
  TCCR0 = (1 << CS02) | (1 << CS00);
  TIMSK |= (1 << TOIE0);
}



ISR(TIMER2_OVF_vect) {
  clock.second++;

  if (useLocalClock == 1) {
    if (clock.second >= 60) {
      clock.minute++;
    }
    if (clock.minute >= 60) {
      clock.minute = 0;
      clock.hour++;
    }
    if (clock.hour >= 24) {
      clock.hour = 0;
    }
  }

  if (clock.second >= 60) {
    clock.second = 0;
  }

  opTime.second++;
  nextSecond = 1;

  if (opTime.second >= 60) {
    opTime.second = 0;
    opTime.minute++;

    nextMinute = 1;
  }
  if (opTime.minute >= 60) {
    opTime.minute = 0;
    opTime.hour++;
  }
  if (opTime.hour >= 24) {
    opTime.hour = 0;
  }
}

ISR(TIMER0_OVF_vect) {
  static uint8_t subDivTack = 0;
  subDivTack++;
  if (subDivTack >= SUB_DIV_LED) {
    subDivTack = 0;
    tack = 1;
  }

  static uint8_t subDivStepper = 0;
  subDivStepper++;
  if (subDivStepper >= SUB_DIV_STEPPER) {
    subDivStepper = 0;
    step = 1;
  }
}


opTime_t clockGetOpTime() {
  return opTime;
}

void clockSetUseLocalClock(uint8_t x) {
  useLocalClock = x;
}

void clockSetClock(uint8_t year, uint8_t month, uint8_t day, uint8_t weekday, uint8_t hour, uint8_t minute) {
  cli();
  clock.year = year;
  clock.month = month;
  clock.day = day;
  clock.weekday = weekday;
  clock.hour = hour;
  clock.minute = minute;
  sei();
}

void clockClearSecond() {
  cli();
  clock.second = 0;
  sei();
}

clock_t clockGetClock() {
  cli();
  clock_t c = clock;
  sei();
  return c;
}

uint8_t clockNextSecond() {
  if (nextSecond != 0) {
    nextSecond = 0;
    return 1;
  } else {
    return 0;
  }
}

uint8_t clockNextMinute() {
  if (nextMinute != 0) {
    nextMinute = 0;
    return 1;
  } else {
    return 0;
  }
}



uint8_t clockNextStep() {
  if (step != 0) {
    step = 0;
    return 1;
  } else {
    return 0;
  }
}

uint8_t clockNextBlink() {
  if (tack != 0) {
    tack = 0;
    return 1;
  } else {
    return 0;
  }
}