// include the library code:
// #include <LiquidCrystal.h>
// // initialize the library with the numbers of the interface pins
// LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

// declare pins for the Joystick module
int posX = A0;
int posY = A1;
// create holders for the LCD position
int cursorCol = 0;
char values[] = {'0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0'};
void setup() {
  Serial.begin(9600);
  // set up the LCD's number of columns and rows:
  // lcd.begin(16, 2);
  // // enable the LCD cursor so that it shows the current index
  lcd.init();
  lcd.backlight();
  lcd.cursor();
}
void loop() {
  char dirToMove = getDirection();
  Serial.print(dirToMove);
  Serial.print(", ");
  
  moveCursor(dirToMove);
  // Move the cursor back to the origin to update the display
  lcd.setCursor(0, 0);
  lcd.print((String)values);
  // now move the cursor back to the current user-selected location
  lcd.setCursor(cursorCol, 0);
  // add a slight delay to keep from moving too fast! :)
  delay(200);
}
// Moves the cursor in the specified direction
void moveCursor(char dirToMove) {
  switch (getDirection()) {
    case 'R': cursorCol += 1;
      break;
    case 'L': cursorCol -= 1;
      break;
    case 'U': values[cursorCol] += 1;
      break;
    case 'D': values[cursorCol] -= 1;
      break;
    default: break;
  }
  // some error handling
  if (cursorCol >= 16) {
    cursorCol = 0;
  } if (cursorCol < 0) {
    cursorCol = 15;
  }
}
// Return the direction the joystick is being held
// L|R will take precedence over U|D
char getDirection() {
  int X = analogRead(posX); int Y = analogRead(posY);
  Serial.print("X:");
  Serial.print(X);
  Serial.print(", Y:");
  Serial.println(Y);
  
  // We care about x first, then y
  // The range of both X/Y is [0, 1023]
  if (X > 923)
  { return 'R';
    //We are holding the joystick RIGHT
  } else if (X < 100) {
    return 'L';
    //We are holding the joystick LEFT
  } else if (Y > 923) {
    return 'U';
    //We are holding the joystick UP
  } else if (Y < 100) {
    return 'D';
    //We are holding the joystick DOWN
  } else {
    return 'C';
    //We are not holding the joystick in any specific direction
  }
}