class NUMBER_INPUT {
  
  //Initalize variables
  int numberOfDigits;
  boolean acceptKeyboard;
  int x;
  int y;
  int boxLength;
  int boxHeight;
  String measurement;
  int maxDigits;
  color mouseOut;
  color mouseOver;
  color mouseClick;
  int [] digitsArray;
  
  //Attributes
  NUMBER_INPUT(int xTEMP, int yTEMP, int boxLengthTEMP, int boxHeightTEMP, String measurementTEMP, int maxDigitsTEMP, color mouseOutTEMP, color mouseOverTEMP, color mouseClickTEMP){
    
    //Assign attributes
    x = xTEMP;
    y = yTEMP;
    boxLength = boxLengthTEMP;
    boxHeight = boxHeightTEMP;
    measurement = measurementTEMP;
    maxDigits = maxDigitsTEMP;
    mouseOut = mouseOutTEMP;
    mouseOver = mouseOverTEMP;
    mouseClick = mouseClickTEMP;
    
    //Assign other variables
    numberOfDigits = 0;
    acceptKeyboard = false;
    digitsArray = new int [maxDigits];
    
    //JUST FOR SMILIE
    digitsArray[0] = 3;
    numberOfDigits = 1;
  }
  
  //Methods
  
  //Draws the boxes
  void display(){
    
    //Colour the box
    //When the box is clicked
    if (acceptKeyboard==true){
      fill(mouseClick);
    }
    
    //When the mouse is over the box
    else if ((mouseX>x)&&(mouseX<x+boxLength)&&(mouseY>y)&&(mouseY<y+boxHeight)){
      fill(mouseOver);
    }
    
    //When the mouse is outside the box
    else {
      fill(mouseOut);
    }
    
    //Draw the box
    rect(x,y,boxLength,boxHeight);
    
    //Collect the digits
    String numberToPrint = "";
    for (int i=0; i<numberOfDigits; i++){
      numberToPrint += digitsArray [i];
    }
    
    //Print the digits
    fill(255);
    text(numberToPrint,x,y+fontConstant);
    
    //Prints units of measurement
    text(measurement,x+boxLength,y+fontConstant);
  }
  
  //Set boxes to or not to accept keyboard inputs ONCE the mouse is pressed
  void activate_keyboardInput(){
    if ((mouseX>x)&&(mouseX<x+boxLength)&&(mouseY>y)&&(mouseY<y+boxHeight)){
      acceptKeyboard = true;
    }
    else {
      acceptKeyboard = false;
    }
  }
  
  //Inserts or deletes a digit according to the keypressed pressed
  void keyboard_input(){
    String digit;
    if (acceptKeyboard == true){
      if (numberOfDigits != maxDigits){
        if (key=='1'){
          this.append_digit("1");
        }
        else if (key=='2'){
          this.append_digit("2");
        }
        else if (key=='3'){
          this.append_digit("3");
        }
        else if (key=='4'){
          this.append_digit("4");
        }
        else if (key=='5'){
          this.append_digit("5");
        }
        else if (key=='6'){
          this.append_digit("6");
        }
        else if (key=='7'){
          this.append_digit("7");
        }
        else if (key=='8'){
          this.append_digit("8");
        }
        else if (key=='9'){
          this.append_digit("9");
        }
        else if (key=='0'){
          this.append_digit("0");
        }
      }
      if (key == BACKSPACE){
        if (numberOfDigits != 0){
          numberOfDigits--;
        }
      }
    }
  }
  
  //To add a digit to the array
  void append_digit(String digit){
    digitsArray[numberOfDigits] = int(digit);
    numberOfDigits++;
  }
  
  //Returns a value
  float return_value(){
    
    if (numberOfDigits == 0){
      return 0;
    }
    
    else {
      float value;
    
      //Collect the digits
      String numberToConvert = "";
      for (int i=0; i<numberOfDigits; i++){
        numberToConvert += digitsArray [i];
      }
    
      //Convert string to interger and return it
      value = float(numberToConvert);
      return value;
    }
  }
}