#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeMonoBoldOblique24pt7b.h>
#include "img.h"
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#include <SPI.h>     // include Arduino SPI library
#include <SD.h>      // include Arduino SD library
#include "TMRpcm.h"  // include TMRpcm library
#define next     3
#define _pause   2

TMRpcm audio;

File root;
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void text() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.display();
}

void setup() {
  Serial.begin(9600);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); 
  }
  pinMode(next,   INPUT_PULLUP);
  pinMode(_pause, INPUT_PULLUP);
  Serial.print("Initializing SD card...");
  text();
  display.print("Initializing SD card...");
  display.display();

  if (!SD.begin()) {
    Serial.println("failed!");
    text();
    display.print("failed!");
    display.display();
    while(true);  // stay here.
  }
  Serial.println("OK!");
  text();
  display.print("OK!");
  display.display();
  audio.speakerPin = 9;  // set speaker output to pin 9

  root = SD.open("/");      // open SD card main root
  printDirectory(root, 0);  // print all files names and sizes

  audio.setVolume(5);    //   0 to 7. Set volume level
  audio.quality(1);      //  Set 1 for 2x oversampling Set 0 for normal
}


void loop() {

  if ( !audio.isPlaying() ) {
    // no audio file is playing
    File entry =  root.openNextFile();  // open next file
    if (! entry) {
      // no more files
      root.rewindDirectory();  // go to start of the folder
      return;
    }

    uint8_t nameSize = String(entry.name()).length();  // get file name size
    String str1 = String(entry.name()).substring( nameSize - 4 );  // save the last 4 characters (file extension)

    if ( str1.equalsIgnoreCase(".wav") ) {
      // the opened file has '.wav' extension
      audio.play( entry.name() );      // play the audio file
      Serial.print("Playing file: ");
      Serial.println( entry.name() );
      text();
      display.print( entry.name() );
      display.display();
    }

    else {
      // not '.wav' format file
      entry.close();
      return;
    }

    while( debounce(next) ) ;  // wait until 'next' button is released
  }

  if ( !digitalRead(next) ) {
    // 'next' button is pressed
    audio.stopPlayback();  // stop playing
    return;
  }

  if ( !digitalRead(_pause) ) {
    // '_pause' button is pressed
    audio.pause();      // pauses/unpauses playback
    while( debounce(_pause) ) ;  // wait until '_pause' button is released
  }

}

// a small function for buttons debounce
bool debounce (int bt)
{
  byte count = 0;
  for(byte i = 0; i < 5; i++)
  {
    if ( !digitalRead(bt) )
      count++;
    delay(10);
  }

  if(count > 2)  return 1;
  else           return 0;
}

void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}

  //display.clearDisplay();
  //display.setTextSize(2);
  //display.setTextColor(WHITE);
  //display.setCursor(0, 0);
  //display.print("Hello My  Name Is   Arduino   UNO");
  //display.display();
  //display.clearDisplay();
  //display.drawBitmap(15, 0, arduino, 128, 64, WHITE);
  //display.display();
  //delay(4000);
  //display.clearDisplay();
  //display.drawBitmap(0, 0, sd, 64, 64, WHITE);
  //display.display();
  //display.setTextSize(1);
  //display.setTextColor(WHITE);
  //display.setCursor(70, 0);
  //display.print("Recherche");
  //display.display();
  //display.setCursor(70, 10);
  //display.print("de la");
  //display.display();
  //display.setCursor(70, 20);
  //display.print("Carte SD");
  //display.display();
  //delay(4000);