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

#include "clock.h"


#define VALID_LED_REG_DIR DDRB
#define VALID_LED_REG PORTB

#define VALID_LED PB0

#define DARK_SWITCH_REG_DIR DDRD
#define DARK_SWITCH_OUT_REG PORTD
#define DARK_SWITCH_IN_REG PIND

#define DARK_SWITCH PD7


uint8_t validLedStatus = 0;

void validLedSetStatus(uint8_t x) {
  validLedStatus = x;
}

uint8_t isNotDark() {
  return DARK_SWITCH_IN_REG & (1 << DARK_SWITCH);
}

static inline void validLedEnable() {
  PORTB |= (1 << PB0);
}

static inline void validLedDisable() {
  PORTB &= ~(1 << PB0);
}


void validLedInit() {
  // validLed
  VALID_LED_REG_DIR |= (1 << VALID_LED);

  // dark switch
  DARK_SWITCH_REG_DIR &= ~(1 << DARK_SWITCH);
  // pull-up on
  DARK_SWITCH_OUT_REG |= (1 << DARK_SWITCH);
}


void validLedEngine() {
  static uint8_t ledToggle = 0;


  if (clockNextBlink()) {
    uint8_t light = isNotDark();

    switch (validLedStatus) {
    case 0:
      validLedDisable();
      break;
    case 1:
      if (ledToggle != 0) {
        ledToggle = 0;
        validLedDisable();
      } else {
        ledToggle = 1;
        if (light != 0) {
          validLedEnable();
        } else {
          validLedDisable();
        }
      }
      break;
    case 2:
      if (light != 0) {
        validLedEnable();
      } else {
        validLedDisable();
      }
      break;
    }
  }
}