//START OLED
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSerif9pt7b.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
//END OLED

#define buz 2
#define buttonHeat 25
#define buttonMain 33

int mode = 0;
int startTimer = 0;

unsigned long Second = 0;
unsigned long Minutes = 1;
unsigned long SaveTime;

void setup() {
  Serial.begin(115200);
  pinMode(buttonMain, INPUT_PULLUP);
  pinMode(buttonHeat, INPUT_PULLUP);
  pinMode(buz, OUTPUT);
}

void loop() {
  if (startTimer == 1) {
    Timer();
  }

  if (digitalRead(buttonMain) == LOW) {
    mode = 1;
    startTimer = 0;
    Second = 0;
    Minutes = 1;
    display.clearDisplay();
    display.display();
    //Serial.println("Program Utama"); 
  } else if (digitalRead(buttonHeat) == LOW) {
    mode = 2;
    startTimer = 1;
    //Serial.println("Heater - Tunggu Woy");
  } else if (mode == 0) {
    Serial.println("Pilih Mode");
  }
}

void Timer() {
  if(millis()-SaveTime>1000) {
    if (Second != 0) {
      Second -= 1;
    }
    else if (Minutes != 0 && Second == 0) {
      Minutes -= 1;
      Second = 59;
    }
    SaveTime = millis();  
  }
  if (Minutes == 0 && Second == 0) {
    bip();
  }
  oledTimer();
  //Serial.println(Minutes);
  //Serial.println(Second);
} 

void bip(){
  do {
    digitalWrite(buz, HIGH);
    delay(200);
    digitalWrite(buz, LOW);
    delay(100);
    digitalWrite(buz, HIGH);
    delay(200);
    digitalWrite(buz, LOW);
    delay(500);
    }
  while (mode == 1);
  }

void oledTimer() {
  //START OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
  }
  display.setFont(&FreeSerif9pt7b);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(5, 20);
  display.print(Minutes);
  display.setCursor(30, 20);
  display.write(":");
  display.setCursor(39, 20);
  display.print(Second);
  display.display();
  //END OLED
}