/*********************************************************************
  gnd vcc clk mosi rst dc
*********************************************************************/
#include "pitches.h"
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SSD1306_128_64

#define OLED_MOSI   5
#define OLED_CLK   4
#define OLED_DC    7
#define OLED_CS    12
#define OLED_RESET 6
Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

long settime = 240;
long disptime;
long end_time;
long disptimeM;
long disptimeS;
boolean start = false;

unsigned long currentTime;
unsigned long loopTime;
const int pin_A = 8;
const int pin_B = 9;
unsigned char encoder_A;
unsigned char encoder_B;
unsigned char encoder_A_prev = 0;
int fadeAmount = 10;

int noteDurations[] = {
  4, 8, 8, 4, 4, 4, 4, 4
};
int melody[] = {
  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
};


void knopka()
{
  static unsigned long millis_prev;
  if (millis() - 300 > millis_prev)
    start = !start; // меняем значение на противоположное
  millis_prev = millis();
}

void setup()   {
  pinMode (4, INPUT);
  display.begin(32);
  display.clearDisplay();
  pinMode (11, OUTPUT);
  digitalWrite(11, HIGH);
  attachInterrupt(0, knopka, RISING);

  pinMode(pin_A, INPUT);
  pinMode(pin_B, INPUT);
  currentTime = millis();
  loopTime = currentTime;

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("VNIMANIE!");

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 8);
  display.println("Ultrafiolet vredit ");

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 16);
  display.println("glazam i kozhe.");

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 24);
  display.println("Ispolzovat razumno.");
  display.display();
    for (int thisNote = 0; thisNote < 8; thisNote++) {
    int noteDuration = 1000 / noteDurations[thisNote];
    tone(10, melody[thisNote], noteDuration);
    int pauseBetweenNotes = noteDuration * 1.30;
    delay(pauseBetweenNotes);
    noTone(10);
  }
  delay(3000);



}



void schet ()
{
  tone(10, 1000, 250);
  disptime = settime;
  end_time = millis() + (disptime * 1000);

  while (disptime > 0 ) {




    disptime = (end_time - millis()) / 1000;
    disptimeM = disptime / 60;
    disptimeS = disptime - (disptimeM * 60);





    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(0, 0);
    display.println("OCTATOK:");
    display.setTextSize(3);
    display.setTextColor(WHITE);
    display.setCursor(25, 8);
    if (disptimeM > 0)
    {
      display.println(disptimeM);
      display.setTextSize(2);
      display.setCursor(44, 15);
      display.println("M");
    }
    if (disptimeS < 10)
    {
      display.setTextSize(3);
      display.setCursor(65, 8);
      display.println("0");
      display.setCursor(83, 8);
      display.println(disptimeS);
    }
    else
    {
      display.setTextSize(3);
      display.setCursor(65, 8);
      display.println(disptimeS);
    }
    display.setTextSize(2);
    display.setCursor(103, 15);
    display.println("C");
    display.display();

    if (start == false)
    {
      digitalWrite(11, HIGH);
      tone(10, 500, 250);
      tone(10, 0, 250);
      tone(10, 500, 250);
      break;
    }

  }
  digitalWrite(11, HIGH);
  tone(10, 500, 200);
  delay(400);
  tone(10, 500, 300);
  start = false;
}





void loop() {
  currentTime = millis();
  if (currentTime >= (loopTime + 1)) {
    encoder_A = digitalRead(pin_A);
    encoder_B = digitalRead(pin_B);
    if ((!encoder_A) && (encoder_A_prev)) {
      if (encoder_B) {
        if (settime + fadeAmount <= 599) settime += fadeAmount;
      }
      else {
        if (settime - fadeAmount >= 0) settime -= fadeAmount;
      }
    }
    encoder_A_prev = encoder_A;
    loopTime = currentTime;
  }
  if (start == true)
  {
    digitalWrite(11, LOW);
    schet();
  }
  display.clearDisplay();
  disptime = settime;
  disptimeM = disptime / 60;
  disptimeS = disptime - (disptimeM * 60);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println("HACTPOuKA:");
  // display.drawPixel(39, 0, WHITE);
  //display.drawPixel(37, 0, WHITE);
  display.drawPixel(38, 0, WHITE);
  display.setTextSize(3);
  display.setTextColor(WHITE);
  display.setCursor(25, 8);
  if (disptimeM > 0)
  {
    display.println(disptimeM);
    display.setTextSize(2);
    display.setCursor(44, 15);
    display.println("M");
  }
  if (disptimeS < 10)
  {
    display.setTextSize(3);
    display.setCursor(65, 8);
    display.println("0");
    display.setCursor(83, 8);
    display.println(disptimeS);
  }
  else
  {
    display.setTextSize(3);
    display.setCursor(65, 8);
    display.println(disptimeS);
  }
  display.setTextSize(2);
  display.setCursor(103, 15);
  display.println("C");
  display.display();
}