#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include "RTClib.h"

RTC_DS1307 rtc;
Adafruit_SSD1306 display(128, 64, &Wire, -1);


int page_counter=1 ;       //To move beetwen pages


//-------Pins-----//
int up = 8;               //Up button
// int down = 10;           //Down button
//---------Storage debounce function-----//
boolean current_up = LOW;          
boolean last_up=LOW;            

        

void setup() {
  Serial.begin(115200);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.display(); 
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  
}
}


   //---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin)
{
boolean current = digitalRead(pin);
if (last != current)
{
delay(5);
current = digitalRead(pin);
}
return current;
}


void loop() {
char buffer [16];
DateTime now = rtc.now();
uint8_t  thisMin, thisHour;
thisMin = now.minute();
thisHour = now.hour();
sprintf (buffer, "%02d:%02d", thisHour, thisMin);

  

current_up = debounce(last_up, up);         //Debounce for Up button

//----Page counter function to move pages----//

//Page Up
    if (last_up== LOW && current_up == HIGH){  //When up button is pressed
      display.clearDisplay();                     //When page is changed, lcd clear to print new page  
      display.display();
      if(page_counter <3){              //Page counter never higher than 3(total of pages)
      page_counter= page_counter +1;   //Page up
      
      }
      else{
      page_counter= 1;  
      }
  }
  
    last_up = current_up;


//------- Switch function to write and show what you want---// 
  switch (page_counter) {
   
    case 1:{     //Design of home page 1
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(0,0);
      display.print(buffer);
      display.drawLine(0, 10, 150, 10,WHITE);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(40,25);
      display.print("Revogreen");
      display.setTextSize(1);
      display.setCursor(31,35);
      display.print("Technologies");
      display.display();
    }
    break;

    case 2:{     //Design of home page 1
      
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(0,0);
      display.print(buffer);
      display.drawLine(0, 10, 150, 10,WHITE);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(11,50);
      display.print("Volatge");
      display.setTextSize(2);
      display.setCursor(11,24);
      display.print("2.5V");
      display.setTextSize(1);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(80,50);
      display.print("Current");
      display.setTextSize(2);
      display.setCursor(80,24);
      display.print("2.5A");
      display.display();
    }
    break;

    case 3: { //Design of page 3 
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(0,0);
      display.print(buffer);
      display.drawLine(0, 10, 150, 10,WHITE);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(11,50);
      display.print("SOC");
      display.setTextSize(2);
      display.setCursor(11,24);
      display.print("80%");
      display.setTextSize(1);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(80,50);
      display.print("Temp1");
      display.setTextSize(2);
      display.setCursor(80,24);
      display.print("50");
      display.drawRect(105,20,4,4,WHITE);
      display.setCursor(110,24);
      display.print("C");
      display.display();
    }
    break;
    
    case 4: { //Design of page 4 
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(0,0);
      display.print(buffer);
      display.drawLine(0, 10, 150, 10,WHITE);
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(3,10);
      display.print("Last Logging done on:");
      display.display();
    }
    break;
    
    
  }//switch end
  
}//loop end