#include "U8g2lib.h"

//U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NONE);
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);


# define ACTIVATED LOW

// initial states
boolean isPlaying = false;
boolean updateScreen = false;


// Buttons
int buttonPlayPause = 3;
int buttonNext = 2;
int buttonPrev = 4;
int testLed = 6;

// list of songs
int songArraySize = 2;
String songs[2] = {"The moon", "Fred"};
String name_song;
int songCounter;

void setup() {


  pinMode(testLed, OUTPUT);
  digitalWrite(testLed, HIGH);
  pinMode(buttonPlayPause, INPUT);
  digitalWrite(buttonPlayPause, HIGH);
  pinMode(buttonNext, INPUT);
  digitalWrite(buttonNext, HIGH);
  pinMode(buttonPrev, INPUT);
  digitalWrite(buttonPrev, HIGH);
  songCounter = 1;

  isPlaying = true;

  u8g2.begin();  

  u8g2.firstPage(); 
  do{
    flashPage();    
  }while(u8g2.nextPage());

}

void loop() {
  
  updateScreen = true;


  // PLAY/PAUSE
  if (digitalRead(buttonPlayPause) == ACTIVATED){
    if(isPlaying)
    {
      digitalWrite(testLed, LOW);
      delay(100);
      isPlaying = false;
      updateScreen = true;
      delay(50);
    }else
    {
      digitalWrite(testLed, HIGH);
      delay(100);
      isPlaying = true;
    }
  }

 // NEXT
  if (digitalRead(buttonNext) == ACTIVATED){
    if(isPlaying)
    {
      if (songCounter == songArraySize){
        songCounter = 1;
      } else {
          songCounter = songCounter + 1;
      }
      
//      u8g2.firstPage();
//      do {
//        draw_new_song(songCounter);
//      } while (u8g2.nextPage() );
//      delay(1000)

     updateScreen = true;
     delay(50);
    }
  }

  // PREVIOUS
  if (digitalRead(buttonPrev) == ACTIVATED){
    if(isPlaying)
    {

     if (songCounter == 1){
        songCounter = songArraySize;
      } else {
          songCounter = songCounter-1;
        }
      delay(500);
      
//      u8g.firstPage();
//      do {
//        draw_new_song(songCounter);
//      } while (u8g.nextPage() );
//      delay(1000);
      
     updateScreen = true;
     delay(50);
    }
  }
  
  //Updating the dispaly
  if(updateScreen)
  {
    u8g2.firstPage();  
    do {player();
      updateScreen = false;
      }while ( u8g2.nextPage() );
  }

}