#include <RTClib.h>       // https://github.com/adafruit/RTClib
#include <TimeLib.h>      // https://github.com/PaulStoffregen/Time


#define   relePin   2
#define   LED       13    // built-in led
#define   SWITCH_PIN    3

#define   SUNDAY    0
#define   SATURDAY  6
#define   RING_SECONDS      10

#define   TZ_OFFSET 180   // MSK

#define   HOURS     60

RTC_DS3231 rtc;

bool status_led = false;

const char* daysOfTheWeek[7] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

const uint16_t raspisanie[] = {
    20 * HOURS + 39,
    9 * HOURS + 15,
    9 * HOURS + 25,
    10 * HOURS + 30,
};

const uint16_t raspisanie2[] = {
    1 * HOURS + 30,
    2 * HOURS + 15,
    3 * HOURS + 25,
    21 * HOURS + 54,
};


void zvonok(DateTime &dt){
    for (int i = 0; i != sizeof(raspisanie)/sizeof(uint16_t); ++i ){
      if ( (dt.hour() * HOURS + dt.minute()) == raspisanie[i] ){
          digitalWrite(relePin, dt.second() < RING_SECONDS ? HIGH : LOW );
          if (digitalRead(relePin)) digitalWrite(LED_BUILTIN, HIGH);
          if (dt.second() < RING_SECONDS){
              Serial.print("Raspisanie 1: Ring for ");
              Serial.print(RING_SECONDS - dt.second());
              Serial.println(" seconds more");
          }
      }
    }        
};

void zvonok2(DateTime &dt){
    for (int i = 0; i != sizeof(raspisanie2)/sizeof(uint16_t); ++i ){
      if ( (dt.hour() * HOURS + dt.minute()) == raspisanie2[i] ){
          digitalWrite(relePin, dt.second() < RING_SECONDS ? HIGH : LOW );
          if (digitalRead(relePin)) digitalWrite(LED_BUILTIN, HIGH);
          if (dt.second() < RING_SECONDS){
              Serial.print("Raspisanie 2: Ring for ");
              Serial.print(RING_SECONDS - dt.second());
              Serial.println(" seconds more");
          }
      }
    }        
};


void setup() {

  pinMode(relePin, OUTPUT);       // выход на реле
  pinMode(LED, OUTPUT);           // Встроенный светодиод, например на Nano имеется...
 
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  digitalWrite(4, HIGH);

  //digitalWrite(relePin, HIGH);
  digitalWrite(LED,     LOW);

  Serial.begin(9600);             // Скорость Serial-порта

  while (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    digitalWrite(LED, !digitalRead(LED));   // И мигаем при этом встроенным светодиодом, сообщая о проблеме...
    delay(200);
  }

  DateTime time_now = rtc.now();
  adjustTime(TZ_OFFSET * SECS_PER_MIN);
  setTime(time_now.hour(), time_now.minute(), time_now.second(), time_now.day(), time_now.month(), time_now.year());
}

void loop() {
    // DateTime time_now = rtc.now();

    DateTime time_now = now();    // use internal clock
    Serial.print("Raspisanie: ");
    Serial.println(digitalRead(SWITCH_PIN) ? 1 : 2 );
    Serial.print("Current Date & Time: ");
    Serial.print(time_now.year(),  DEC);
    Serial.print('/');
    Serial.print(time_now.month(),  DEC);
    Serial.print('/');
    Serial.print(time_now.day(),    DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[time_now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(time_now.hour(),   DEC);
    Serial.print(':');
    Serial.print(time_now.minute(), DEC);
    Serial.print(':');
    Serial.print(time_now.second(), DEC);
    Serial.println();

  // digitalWrite(5, HIGH); не знаю что это

  digitalWrite(LED_BUILTIN, status_led);
  status_led = !status_led;

  if (time_now.dayOfTheWeek() != SUNDAY && time_now.dayOfTheWeek() != SATURDAY) {  // Если сегодня будний день (Пн...Пт), то...   
    if (digitalRead(SWITCH_PIN)){
      zvonok(time_now);
    } else {
      zvonok2(time_now);
    }
  }

  delay(1000);
}