#include <FatReader.h>
#include <SdReader.h>
#include <avr/pgmspace.h>
#include "WaveUtil.h"
#include "WaveHC.h"
#include <Wire.h>
#include <stdio.h>

#define MAX_OUT_CHARS 16  //max nbr of characters to be sent on any one serial command

char   buffer[MAX_OUT_CHARS + 1];  //buffer used to format a line (+1 is for trailing 0)
SdReader card;    // This object holds the information for the card
FatVolume vol;    // This holds the information for the partition on the card
FatReader root;   // This holds the information for the filesystem on the card
FatReader f;      // This holds the information for the file we're play

WaveHC wave;      // This is the only wave (audio) object, since we will only play one at a time

#define DEBOUNCE 100  // button debouncer


int reading1 = 0;
int currentsound = 0;



// this handy function will return the number of bytes currently free in RAM, great for debugging!   
int freeRam(void)
{
  extern int  __bss_end; 
  extern int  *__brkval; 
  int free_memory; 
  if((int)__brkval == 0) {
    free_memory = ((int)&free_memory) - ((int)&__bss_end); 
  }
  else {
    free_memory = ((int)&free_memory) - ((int)__brkval); 
  }
  return free_memory; 
} 

void sdErrorCheck(void)
{
  if (!card.errorCode()) return;
  putstring("\n\rSD I/O error: ");
  Serial.print(card.errorCode(), HEX);
  putstring(", ");
  Serial.println(card.errorData(), HEX);
  while(1);
}

uint32_t testnewsamplerate;
int randomnumber = 0;
int switchon = 0;
int serialnumber = 0;
int file;
char* ext = ".wav";

String currentfile;

void setup() {
  
  Wire.begin(3);                // join i2c bus with address #4
  Wire.onReceive(receiveEvent); // register event
  Serial.begin(9600);           // start serial for output
  
  
  // set up serial port
  Serial.begin(9600);
  putstring_nl("WaveHC with 6 buttons");
  
   putstring("Free RAM: ");       // This can help with debugging, running out of RAM is bad
  Serial.println(freeRam());      // if this is under 150 bytes it may spell trouble!
  
  // Set the output pins for the DAC control. This pins are defined in the library
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
 
  // pin13 LED
  pinMode(13, OUTPUT);
 
  // enable pull-up resistors on switch pins (analog inputs)
  digitalWrite(14, HIGH);
  digitalWrite(15, HIGH);
  digitalWrite(16, HIGH);
  digitalWrite(17, HIGH);
  digitalWrite(18, HIGH);
  digitalWrite(19, HIGH);
 
  //  if (!card.init(true)) { //play with 4 MHz spi if 8MHz isn't working for you
  if (!card.init()) {         //play with 8 MHz spi (default faster!)  
    putstring_nl("Card init. failed!");  // Something went wrong, lets print out why
    sdErrorCheck();
    while(1);                            // then 'halt' - do nothing!
  }
  
  // enable optimize read - some cards may timeout. Disable if you're having problems
  card.partialBlockRead(true);
 
// Now we will look for a FAT partition!
  uint8_t part;
  for (part = 0; part < 5; part++) {     // we have up to 5 slots to look in
    if (vol.init(card, part)) 
      break;                             // we found one, lets bail
  }
  if (part == 5) {                       // if we ended up not finding one  :(
    putstring_nl("No valid FAT partition!");
    sdErrorCheck();      // Something went wrong, lets print out why
    while(1);                            // then 'halt' - do nothing!
  }
  
  // Lets tell the user about what we found
  putstring("Using partition ");
  Serial.print(part, DEC);
  putstring(", type is FAT");
  Serial.println(vol.fatType(),DEC);     // FAT16 or FAT32?
  
  // Try to open the root directory
  if (!root.openRoot(vol)) {
    putstring_nl("Can't open root dir!"); // Something went wrong,
    while(1);                             // then 'halt' - do nothing!
  }
  
  // Whew! We got past the tough parts.
  putstring_nl("Ready!");
  

   
}

void loop() {
 
  
  reading1 = digitalRead(14);
 
  
  if (switchon==1) {
 sprintf(buffer,"%d.wav",file); 
    
    
      playcomplete(buffer);
   



 switchon=0;


  }

 
  }



int16_t lastpotval = 0;
#define HYSTERESIS 3

void playcomplete(char *name) {
  int16_t potval;
  uint32_t newsamplerate;

  playfile(name);
  while (wave.isplaying) {
     potval = 545;
     if ( ((potval - lastpotval) > HYSTERESIS) || ((lastpotval - potval) > HYSTERESIS)) {
        newsamplerate = wave.dwSamplesPerSec;  // get the original sample rate
        newsamplerate *= potval;                       // scale it by the analog value
        newsamplerate /= 512;   // we want to 'split' between 2x sped up and slowed down.
        wave.setSampleRate(newsamplerate);  // set it immediately!
        Serial.println(newsamplerate, DEC);  // for debugging
        //lastpotval = potval;
     }
     delay(100);
   }

}





/*

// Plays a full file from beginning to end with no pause.
void playcomplete(char* name) {
  // call our helper to find and play this name
  playfile(name);
  while (wave.isplaying) {
 //wave.setSampleRate(22050);
  }
  // now its done playing
}
*/
void playfile(char* name) {
  // see if the wave object is currently doing something
  if (wave.isplaying) {// already playing something, so stop it!
    wave.stop(); // stop it
  }
  // look in the root directory and open the file
  if (!f.open(root, name)) {
    putstring("Couldn't open file "); Serial.print(name); return;
  }
  // OK read the file and turn it into a wave object
  if (!wave.create(f)) {
    putstring_nl("Not a valid WAV"); return;
  }
  
  // ok time to play! start playback
  wave.play();
  
}

void receiveEvent(int howMany)
{
  while(1 < Wire.available()) // loop through all but the last
  {
    int a = Wire.receive();    // receive On
    int x = Wire.receive();    // receive directory
    int y = Wire.receive();    // receive bfile number     
    
  switchon = a;
  serialnumber = x*100;   // math to deterime directory
  file = serialnumber + y;  //adds directory number to the file number

  }

}