#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define CLK 2
#define DT 3
#define SEL 4
#define MORE 7

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


int steps = 5;
int counter = 0;
int currentStateCLK, lastStateCLK, knob, knobSize;
int knobQty = 4;
int x_knobDot[8], y_knobDot[8], potVal[8];
int x_knobPos, y_knobPos;
int knobSelect = 0;
int timeOut = 0;
float radian[8], radianMap[8];

int presetScreen = 1;

String knobName[8] = {"OVER", "GAIN", "TONE", "LEVL"};

byte defaultNames[17] = { 16, 18, 5, 19, 5, 20, 75, 14, 71, 54, 55, 56, 57, 58, 59, 60, 61 };

char caracter[] = "?ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-=()/|@#*&. ";



void setup() {

  pinMode(SEL, INPUT_PULLUP);
  pinMode(MORE, INPUT_PULLUP);
  pinMode(CLK,INPUT);
	pinMode(DT,INPUT);



	lastStateCLK = digitalRead(CLK);
	
	
  attachInterrupt(0, updateEncoder, CHANGE);
	attachInterrupt(1, updateEncoder, CHANGE);
	
  display.setTextSize(1);
  display.setTextColor(WHITE);
  

  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    
    for(;;);
  }
  
  display.clearDisplay();

  

}

void loop() {

  if(timeOut<=200){
    timeOut ++;
  }

  

  if (timeOut==100){
    //timeOut = 0;
    knobSelect=0;
  }

if (timeOut>=200){
    //timeOut = 0;
    presetScreen=0;
    //knobSelect=0;
  }

 if(presetScreen==1){

    mainMenu();

 }else{

  namePreset();

 }

 
  
  buttons();

  

  display.display();
  display.clearDisplay();
  
  

   


  
}



void mainMenu(){

  knob = 128/knobQty;

  x_knobPos = knob/2;
  knobSize = x_knobPos/1.7;

  y_knobPos = 32;
 


    

  


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

    radianMap[i] = map(potVal[i], 0, 100, 574.5, 52.5);
    radian[i] = radianMap[i]/100;

    int x1, y1, x2, y2;
    float angle;
    

    x_knobDot[i] = x_knobPos + sin(radian[i]) * (knobSize/2);
    y_knobDot[i] = y_knobPos + cos(radian[i]) * (knobSize/2);

   
    for(int i = 1; i<=11; i++){

      angle = i*10;
      angle = angle * 0.0523598;

      x1 = x_knobPos + (sin(angle)) * (knobSize*1.2);
      y1 = y_knobPos + (cos(angle)) * (knobSize*1.2);
      x2 = x_knobPos + (sin(angle)) * (knobSize*1.3);
      y2 = y_knobPos + (cos(angle)) * (knobSize*1.3);

      //display.fillCircle(x1, y1, knobSize/10, WHITE);
      display.drawLine(x1, y1, x2, y2, WHITE);

    }
    
      if (knobSelect == i+1){  
      display.fillCircle(x_knobPos, y_knobPos, knobSize/1.2, WHITE);
      display.drawCircle(x_knobPos, y_knobPos, knobSize, WHITE);
      display.fillCircle(x_knobDot[i], y_knobDot[i], knobSize/5, BLACK);
      }else{
        display.drawCircle(x_knobPos, y_knobPos, knobSize, WHITE);
        display.fillCircle(x_knobDot[i], y_knobDot[i], knobSize/5, WHITE);
      }

      display.setTextSize(1);
      display.setCursor(x_knobPos-11,0);
      display.print(knobName[i]);


      if(potVal[i]<=9){
          display.setCursor(x_knobPos-2,y_knobPos*1.7);
      }
      if(potVal[i]>=10 && potVal[i]<=99){
          display.setCursor(x_knobPos-6,y_knobPos*1.7);
      }
      if(potVal[i]>=100){
          display.setCursor(x_knobPos-9,y_knobPos*1.7);
      }
      
      display.print(potVal[i]);

      x_knobPos = x_knobPos + knob;
      
      
      

   }

  
}


void namePreset(){

      display.setTextSize(2);
      display.setCursor(4,24);

      for(int i = 0; i<10; i++){

        display.print(caracter[defaultNames[i]]);

      }
      

}


 void buttons(){

    if(digitalRead(MORE)==LOW){

        display.clearDisplay();
        knobQty = knobQty + 1;
        delay(500);

    }

    if (digitalRead(SEL)==LOW){
      knobSelect ++;
      timeOut = 0;
      presetScreen=1;
      delay(500);
    }

    if (knobSelect >= knobQty+1){
      knobSelect = 1;
    }

 }





void updateEncoder(){

	currentStateCLK = digitalRead(CLK);



	if (currentStateCLK != lastStateCLK && currentStateCLK == 1){

	
if (digitalRead(DT) != currentStateCLK) {
			counter --;
			
      //cuendo gira el encoder sentido antihorario

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

    if(potVal[i]>=1 && knobSelect==i+1){

        potVal[i] = potVal[i] - steps;
        timeOut = 0;
        

      }

  }
      
      

      
   
      
		} else {

			counter ++;
			
      //cuando gira el encoder sentido horario

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

      if(potVal[i]<=99 && knobSelect==i+1){

        potVal[i] = potVal[i] + steps;
        timeOut = 0;
      

      }

    }
      
      
      
		}

	
	}

   
	 
	lastStateCLK = currentStateCLK;
}