/*  ===================================
 *  Arduino Demo
 *
 *  by computerarchiv-muenchen.de
 *
 *  http://demo97.makercafe-muenchen.de
 *  ===================================
 */


#include <Arduboy2.h>

// Make an instance of arduboy used for many functions
Arduboy2 arduboy;

// Variables for your game go here.
char title[] = "Press Buttons!";
byte x;
byte y;

// Width of each character including inter-character space
#define CHAR_WIDTH 6

// Height of each character
#define CHAR_HEIGHT 8

// To get the number of characters, we subtract 1 from the length of
// the array because there will be a NULL terminator at the end.
#define NUM_CHARS (sizeof(title) - 1)

// This is the highest value that x can be without the end of the text
// going farther than the right side of the screen. We add one because
// there will be a 1 pixel space at the end of the last character.
// WIDTH and HEIGHT are defined in the Arduboy library.
#define X_MAX (WIDTH - (NUM_CHARS * CHAR_WIDTH) + 1)

// This is the highest value that y can be without the text going below
// the bottom of the screen.
#define Y_MAX (HEIGHT - CHAR_HEIGHT)


// This function runs once in your game.
// use it for anything that needs to be set only once in your game.
void setup() {
  //initiate arduboy instance
  arduboy.begin();

  // here we set the frame rate to 30, we do not need to run at default 60 and
  // it saves us battery life.
  arduboy.setFrameRate(30);

  // set x and y to the middle of the screen
  x = (WIDTH / 2) - (NUM_CHARS * CHAR_WIDTH / 2);
  y = (HEIGHT / 2) - (CHAR_HEIGHT / 2);
}


// our main game loop, this runs once every cycle/frame.
// this is where our game logic goes.
void loop() {
  // pause render until it's time for the next frame
  if (!(arduboy.nextFrame()))
    return;

  // the next couple of lines will deal with checking if the D-pad buttons
  // are pressed and move our text accordingly.
  // We check to make sure that x and y stay within a range that keeps the
  // text on the screen.

  // if the right button is pressed move 1 pixel to the right every frame
  if(arduboy.pressed(RIGHT_BUTTON) && (x < X_MAX)) {
    x++;
  }

  // if the left button is pressed move 1 pixel to the left every frame
  if(arduboy.pressed(LEFT_BUTTON) && (x > 0)) {
    x--;
  }

  // if the up button or B button is pressed move 1 pixel up every frame
  if((arduboy.pressed(UP_BUTTON) || arduboy.pressed(B_BUTTON)) && (y > 0)) {
    y--;
  }

  // if the down button or A button is pressed move 1 pixel down every frame
  if((arduboy.pressed(DOWN_BUTTON) || arduboy.pressed(A_BUTTON)) && (y < Y_MAX)) {
    y++;
  }


  // we clear our screen to black
  arduboy.clear();

  // we set our cursor x pixels to the right and y down from the top
  arduboy.setCursor(x, y);

  // then we print to screen what is stored in our title variable we declared earlier
  arduboy.print(title);

  // then we finally we tell the arduboy to display what we just wrote to the display.
  arduboy.display();
}