/* MAKING MUSIC WITH ARDUINO

  "Encoder 4 - MIDI CC for Traktor"

  by Gustavo Silveira
  ofered by: www.musiconerd.com & www.bitcontrollers.com
  gustavosilveira@musiconerd.com

*/

#include <EnableInterrupt.h>
#include <MIDI.h>
#include <RotaryEncoder.h>;


MIDI_CREATE_DEFAULT_INSTANCE();



#define outputA 8
#define outputB 9
#define outputA2 6
#define outputB2 7

#define ledPin 5

int val = 0;
int val2 = 0;

RotaryEncoder encoder(8,9,10,3,10);
RotaryEncoder encoder2(6,7,10,3,10);

int counter = 0;
int aState;
int aLastState;

int counter2 = 0;
int aState2;
int aLastState2;

/////////////////////////////////////////////
// buttons
const int NButtons = 1;
const int buttonPin[NButtons] = {4};     // the number of the pushbutton pin
int buttonCState[NButtons] = {0};         // stores the button current value
int buttonPState[NButtons] = {0};        // stores the button previous value

/////////////////////////////////////////////

// debounce
unsigned long lastDebounceTime[NButtons] = {0};  // the last time the output pin was toggled
unsigned long debounceDelay = 5;    // the debounce time; increase if the output flickers

/////////////////////////////////////////////
// midi
byte midiCh = 1; // MIDI channel to be used
byte note = 36; // Lowest MIDI note
byte cc = 1; // Lowest MIDI CC

void setup() {
  enableInterrupt(outputA, encoderRot, CHANGE);
  enableInterrupt(outputB, encoderRot, CHANGE);
  enableInterrupt(val, encoderRot, CHANGE);

  pinMode (outputA, INPUT_PULLUP);
  pinMode (outputB, INPUT_PULLUP);
  pinMode (val, INPUT_PULLUP);
  pinMode (buttonPin[0], INPUT_PULLUP);
  pinMode (ledPin, OUTPUT);

  enableInterrupt(outputA2, encoderRot2, CHANGE);
  enableInterrupt(outputB2, encoderRot2, CHANGE);
  enableInterrupt(val2, encoderRot2, CHANGE);

  pinMode (outputA2, INPUT_PULLUP);
  pinMode (outputB2, INPUT_PULLUP);
  pinMode (val2, INPUT_PULLUP);

  // Reads the initial state of the outputA
  aLastState = digitalRead(outputA);
  aLastState2 = digitalRead(outputA2);

  MIDI.begin();
  Serial.begin(115200);

  MIDI.setHandleControlChange(handleControlChange); // Listens to control change
  MIDI.setHandleNoteOn(handleNoteOn); // Listens to note ons
  MIDI.setHandleNoteOff(handleNoteOff); // Listens to note offs
}

void loop() {


int enc = encoder.readEncoder();
  if(enc != 0) {
    val = val + (enc);
    val = min(val,127);
    val = max(val,0);
    //Serial.println(val);
  }

int enc2 = encoder2.readEncoder();
  if(enc2 != 0) {
    val2 = val2 + (enc2);
    val2 = min(val2,127);
    val2 = max(val2,0);
    //Serial.println(val);
  }
  delayMicroseconds(1);

  buttons();

}

void encoderRot () {

aState = digitalRead(outputA); // Reads the current "state" of the Encoder
    // If the previous state and the current state of outputA are different, it means that a pulse occurred
  if (aState != aLastState) {
    // If the outputB state is different from outputA it means that the Encoder is rotating clockwise
    if (digitalRead(outputB) != aState) {
      MIDI.sendControlChange(cc, val, 1);
    } else {
      MIDI.sendControlChange(cc, val, 1);
    }
    //Serial.print("Midi CC: "); Serial.println(val);
  }
  aLastState = aState; // Stores the actual value in the previous value
}

void encoderRot2 () {
  aState2 = digitalRead(outputA2); // Reads the current "state" of the Encoder
      // If the previous state and the current state of outputA are different, it means that a pulse occurred
    if (aState2 != aLastState2) {
      // If the outputB state is different from outputA it means that the Encoder is rotating clockwise
      if (digitalRead(outputB2) != aState2) {
        MIDI.sendControlChange(cc, val2, 2);
      } else {
        MIDI.sendControlChange(cc, val2, 2);
      }
      //Serial.print("Midi CC: "); Serial.println(val);
    }
    aLastState2 = aState2; // Stores the actual value in the previous value
}




/////////////////////////////////////////////
// BUTTONS
void buttons() {

  for (int i = 0; i < NButtons; i++) {

    buttonCState[i] = digitalRead(buttonPin[i]);

    if ((millis() - lastDebounceTime[i]) > debounceDelay) {

      if (buttonPState[i] != buttonCState[i]) {
        lastDebounceTime[i] = millis();

        if (buttonCState[i] == LOW) {
          MIDI.sendNoteOn(note + i, 127, midiCh);
          //          Serial.print("button on  >> ");
          //          Serial.println(i);
        }
        else {
          MIDI.sendNoteOn(note + i, 0, midiCh);
          //          Serial.print("button off >> ");
          //          Serial.println(i);
        }
        buttonPState[i] = buttonCState[i];
      }
    }
  }
}

////////////////////////////////////////////
// MIDI IN
void handleControlChange(byte channel, byte number, byte value) { // channel, CC, value


}


void handleNoteOn(byte channel, byte number, byte value) { // channel, note, velocity


}


void handleNoteOff(byte channel, byte number, byte value) { // channel, note, velocity


}