// main.js
//  Handling a map, actors and an interval timer.
var map;
var mapManager;
var ship;
var CLEFTS_NUM = 20;
var clefts;
var cleftsIdx = 0;
var BULLETS_NUM = 40;
var bullets;
var bulletsIdx = 0;
var TURRETS_NUM = 10;
var turrets;
var turretsIdx = 0;
var turretAppCnt;
var timerID;

// Initialize.
window.onload = function() {
  map = new GMap(document.getElementById("map"));
  mapManager = new MapManager(map);
  ship = new Ship;
  clefts = new Array();
  for (var i = 0; i < CLEFTS_NUM; i++)
    clefts.push(new Cleft);
  bullets = new Array();
  for (var i = 0; i < BULLETS_NUM; i++)
    bullets.push(new Bullet);
  turrets = new Array();
  for (var i = 0; i < TURRETS_NUM; i++)
    turrets.push(new Turret);
  turretAppCnt = 0;
  timerID = setInterval("update()", 66);
}

// Clear an interval timer.
window.onunload = function() {
  clearInterval(timerID);
}

// Update the state to the next frame.
update = function() {
  mapManager.update();
  ship.update();
  for (var i = 0; i < CLEFTS_NUM; i++)
    clefts[i].update();
  for (var i = 0; i < BULLETS_NUM; i++)
    bullets[i].update();
  for (var i = 0; i < TURRETS_NUM; i++)
    turrets[i].update();
  turretAppCnt--;
  if (turretAppCnt <= 0) {
    addTurret();
    turretAppCnt = Math.random() * 50 + 10;
  }
}

getCleftInstance = function() {
  for (var i = 0; i < CLEFTS_NUM; i++) {
    cleftsIdx++;
    if (cleftsIdx >= CLEFTS_NUM)
      cleftsIdx = 0;
    if (!clefts[cleftsIdx].exists) {
      return clefts[cleftsIdx];
    }
  }
  return null;
}

getBulletInstance = function() {
  for (var i = 0; i < BULLETS_NUM; i++) {
    bulletsIdx++;
    if (bulletsIdx >= BULLETS_NUM)
      bulletsIdx = 0;
    if (!bullets[bulletsIdx].exists) {
      return bullets[bulletsIdx];
    }
  }
  return null;
}

getTurretInstance = function() {
  for (var i = 0; i < TURRETS_NUM; i++) {
    turretsIdx++;
    if (turretsIdx >= TURRETS_NUM)
      turretsIdx = 0;
    if (!turrets[turretsIdx].exists) {
      return turrets[turretsIdx];
    }
  }
  return null;
}

checkTurretsHit = function(p) {
  var t;
  for (var i = 0; i < TURRETS_NUM; i++) {
    t = turrets[i];
    if (t.exists)
      t.checkHit(p);
  }
}

addTurret = function() {
  var t = getTurretInstance();
  if (t == null)
    return;
  var type;
  var interval;
  var speed;
  switch (Math.floor(Math.random() * 10)) {
  case 0:
  case 1:
  case 2:
  case 3:
  case 4:
    type = BULLET_TYPE_AIM;
    interval = 20 + Math.random() * 20;
    break;
  case 5:
  case 6:
    type = BULLET_TYPE_SHOTGUN;
    interval = 40 + Math.random() * 20;
    break;
  case 7:
  case 8:
    type = BULLET_TYPE_3WAY;
    interval = 40 + Math.random() * 20;
    break;
  case 9:
    type = BULLET_TYPE_5WAY;
    interval = 50 + Math.random() * 10;
    break;
  }
  speed = 0.00003 + Math.random() * 0.00002;
  t.set(Math.random() * (mapManager.bounds.maxX - mapManager.bounds.minX) + mapManager.bounds.minX,
        mapManager.bounds.maxY - Math.random() * (mapManager.bounds.maxY - mapManager.bounds.minY) * 0.2,
        type, interval, speed);
}