; [[World _vtable] methodAt: 'tickEvent put: (lambda () 0) with: 0]
; [editor fontSize: '20]
; (define CompilerOptions (import "CompilerOptions"))
; [CompilerOptions verboseSyntax: false]

(define World (import "WorldView"))
(load "bunnu.k")

{ bunnu-program }
// -------------------- Bunnu Tennis Game -------------------- //

// Print functions
editor.replace = function(start, size, string) {
  #[editor replaceFrom: start size: size with: string];
};
var showChar = function(x, y, string) {
  var offset = #[editor getOffset: [x, y]];
  var length = string.size();
  editor.replace(offset, length, string);
};

// Initialization
var width = 20;
var height = 16;
var ballX = 10;
var ballY = 2;
var ballDX = 1;
var ballDY = 1;
var playerX = 10;
var playerY = height - 1;
var playerXNext = 10;
var timer = 0;

var init = function() {
  for (y = 0; y < height; y = y + 1) {
    editor.replace(0, 0, "....................\n");
  }
};

init();

// Main Loop
var tick = function (display) {
    showChar(ballX, ballY, ".");
    showChar(playerX, playerY, "...");
  if ((ballX <= 0) || (width - 1 <= ballX)) ballDX = 0 - ballDX;
  if (ballY <= 0) ballDY = 0 - ballDY;
  if (height - 1 <= ballY) ballDY = 0 - ballDY;
  ballX = ballX + ballDX;
  ballY = ballY + ballDY;
  playerX = playerXNext;
  showChar(ballX, ballY, "O");
  showChar(playerX, height - 1, "===");
};

// Event Handlers
editor.pointerMotionEvent = function(event) {
  var x = (event.localPosition().x() / 10).asInteger();
  if ((0 <= x) && (x <= (width - 3)))
    playerXNext = x;
};

World.tickEvent = function() {
  timer = timer + 1;
  if ((timer % 2) == 0) tick();
};