#include <SerialFlash.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>

const int myInput = AUDIO_INPUT_LINEIN;

// Create the Audio components.  These should be created in the
// order data flows, inputs/sources -> processing -> outputs
//
AudioInputI2S     audioInput;
AudioAnalyzeNoteFrequency notefreq;

// Connect either the live input or synthesized sine wave
AudioConnection patchCord1(audioInput, 0, notefreq, 0);

AudioControlSGTL5000 audioShield;

double val = 0;                 // variable to store the values from sensor(initially zero)
float thing = 0;
float max_voltage = 5;
float min_voltage = 2.1;
float max_note = 101;
float min_note = 84;
float lin_interp = (max_note - min_note) / (max_voltage - min_voltage);
int note = int(min_note);
int channel = 1; // Defines the MIDI channel to send messages on (values from 1-16)
int velocity = 100; // Defines the velocity that the note plays at (values from 0-127)
int prev_note = int(min_note);
float avg = 0.0;
int buzz_avg = 0;
const int WINDOW_LENGTH = 5; // this number times 25ms is the time averaged over

void setup()
{
  delay(250);
  AudioMemory(30);
  delay(250);


  // Enable the audio shield and set the output volume.
  audioShield.enable();
  audioShield.inputSelect(myInput);
//  audioShield.volume(0.5);

  notefreq.begin(0.15);

  Serial.begin(9600);               // starts the serial monitor
}

void loop()
{
  delay(100);
  avg = 0.0;
  buzz_avg = 0;
  // Get an average
  int mouthPieceRegister = 0;
  if (notefreq.available()) {
    for (int i = 0; i < WINDOW_LENGTH; i++) {
      int freq = notefreq.read();
//      Serial.println(freq);
      buzz_avg += freq;
      val = analogRead(A7);
//      Serial.println(val*5/1024);
      thing = pow(val, 0.935);
      avg += (thing * 5.0) / 1024.0;
      delay(10);
    }
//    Serial.println(avg/5);
    buzz_avg = buzz_avg/WINDOW_LENGTH;

    if ( buzz_avg < 450) {
      mouthPieceRegister = 84;
    } else {
      mouthPieceRegister = 92;
    }
  }

  if (mouthPieceRegister != 0) {
    // Get the note
    note = (((avg / WINDOW_LENGTH) - min_voltage) * lin_interp);
    // increase the note
    note = note + mouthPieceRegister;

    if (note >= min_note && note <= max_note) {
      if (note != prev_note)
      {
        Serial.println(note);
        usbMIDI.sendNoteOff(prev_note, 0, channel);
        prev_note = note;
        usbMIDI.sendNoteOn(note, velocity, channel);
      }
    } else {
      usbMIDI.sendNoteOff(prev_note, 0, channel);
    }
    delay(50);
  }
  else {
    Serial.println("no fam");
    usbMIDI.sendNoteOff(prev_note, 0, channel);
    prev_note = 0;
    delay(100);
  }
}