//#include <Arduino.h>

/*
  Lib SAMD21Audio

  von AloyseTech, die abgeleitet ist von BriscoeTech
*/

#include <SdFat.h>
//SdFat SD;
//#include <SPI.h>
#include <SamdAudio.h>
long r;
long lastrandom = 0;
String sample;
const char *file;
SamdAudio AudioPlayer;

int trigger=2; 
int echo=1; 
long dauer=0; 
long entfernung=0;
int sounds;


#define NUM_AUDIO_CHANNELS 4 //could be 1,2 or 4 for sound

// which Serial you prefer, for information.
#define SERIAL SerialUSB
//#define SERIAL Serial

// SD chip select pin (with ethernet shield : 4)
#define YOUR_SD_CS 3//10

//indicate sample rate here (use audacity to convert your wav)
const unsigned int sampleRate = 22050;

bool state = true;

uint32_t timer = 0, updatetimer = 0;

void stop()
{
  AudioPlayer.stopChannel(0);
  SERIAL.println(" stop");

}

int NumberofFiles()
{
  File file;
  File root;
  int rootFileCount = 0;

  if (!root.open("/")) {
    SERIAL.print("open root");
  }

  while (file.openNext(&root, O_RDONLY)) {
    if (!file.isHidden()) {
      rootFileCount++;
    }
  }

  file.close();
  return rootFileCount;
}




void setup()
{

  pinMode(trigger, OUTPUT); 
  pinMode(echo, INPUT);



  // debug output at 115200 baud
  SERIAL.begin(115200);



  // setup SD-card
  SERIAL.print("Initializing SD card...");
  if (AudioPlayer.begin(sampleRate, NUM_AUDIO_CHANNELS, YOUR_SD_CS) == -1) 
  {
    SERIAL.println(" failed!");
    return;
  }
  SERIAL.println(" done.");

  sounds = NumberofFiles();

  }

void loop()
{
  digitalWrite(trigger, LOW); 
  delay(5); 
  digitalWrite(trigger, HIGH); 
  delay(10);
  digitalWrite(trigger, LOW);
  dauer = pulseIn(echo, HIGH); 
  entfernung = (dauer/2) * 0.03432; 
  if (entfernung < 100 ) 
  {
    do
    {
      r = random(1,sounds);
      SERIAL.println (r);
      SERIAL.println (lastrandom);
    } while (r == lastrandom);
    lastrandom = r;
    sample = String(r );
    sample = sample +".wav";
    file = sample.c_str();
    AudioPlayer.play(file, 0, stop);
    //AudioPlayer.play("silence.wav", 1);
    SERIAL.println( entfernung );
    SERIAL.print( sample );
    SERIAL.println (sounds);
    delay(3000);
  }

}

[env:seeed_xiao]
platform = atmelsam
board = seeed_xiao
framework = arduino
lib_extra_dirs = C:\Users\******\Documents\PlatformIO\Projects\SAMD21Sound\lib\SamdAudio
lib_deps = 

    greiman/SdFat@^2.0.2