// ship.js
//  Player's ship and a blaster.
var SHIP_SPEED = 0.00004;
var SIGHT_DISTANCE = 0.0008;
var sicon = new GIcon;
sicon.image = "images/ship.png";
sicon.shadow = "images/dummy_shadow.png";
sicon.iconSize = new GSize(16, 16);
sicon.shadowSize = new GSize(1, 1);
sicon.iconAnchor = new GPoint(8, 8);
var sgicon = new GIcon(sicon);
sgicon.image = "images/sight.png";
var imicon = new GIcon(sicon);
imicon.image = "images/impact.png";
var blicon = new GIcon(sicon);
blicon.image = "images/blaster.png";

function Ship() {
  this.marker = new GMarker(
    new GPoint(mapManager.centerX,
               (mapManager.bounds.maxY - mapManager.bounds.minY) / 4 +
               mapManager.bounds.minY), sicon);
  this.sightMarker = new GMarker(
    new GPoint(mapManager.centerX, mapManager.centerY), sgicon);
  this.impactMarker = new GMarker(
    new GPoint(mapManager.centerX, mapManager.centerY), imicon);
  this.blasterMarker = new GMarker(
    new GPoint(mapManager.centerX, mapManager.centerY), blicon);
  this.blasterCnt = 0;
  map.addOverlay(this.marker);
  map.addOverlay(this.sightMarker);
  this.blasterExplosion = new Explosion();
  this.shipExplosion = new Explosion();

  this.update = function() {
    if (key[KEY_LEFT])
      this.marker.point.x -= SHIP_SPEED;
    if (key[KEY_RIGHT])
      this.marker.point.x += SHIP_SPEED;
    if (key[KEY_UP])
      this.marker.point.y += SHIP_SPEED;
    if (key[KEY_DOWN])
      this.marker.point.y -= SHIP_SPEED;
    this.marker.point.x += mapManager.velX;
    this.marker.point.y += mapManager.velY;
    if (this.marker.point.x < mapManager.bounds.minX)
      this.marker.point.x = mapManager.bounds.minX;
    if (this.marker.point.x > mapManager.bounds.maxX)
      this.marker.point.x = mapManager.bounds.maxX;
    if (this.marker.point.y < mapManager.bounds.minY)
      this.marker.point.y = mapManager.bounds.minY;
    if (this.marker.point.y > mapManager.bounds.maxY - SIGHT_DISTANCE)
      this.marker.point.y = mapManager.bounds.maxY - SIGHT_DISTANCE;

    var xr = (this.marker.point.x - mapManager.bounds.minX) /
      (mapManager.bounds.maxX - mapManager.bounds.minX);
    var yr = (this.marker.point.y - mapManager.bounds.minY) /
      (mapManager.bounds.maxY - mapManager.bounds.minY);
    var mvx = 0;
    if (xr < 0.3)
      mvx = -(0.3 - xr) * 7 * MAP_SCROLL_SPEED;
    else if (xr > 0.7)
      mvx = (xr - 0.7) * 7 * MAP_SCROLL_SPEED;
    mapManager.velX += (mvx - mapManager.velX) * 0.1;
    var mvy = MAP_SCROLL_SPEED;
    mvy = (1 + yr * 5) * MAP_SCROLL_SPEED;
    mapManager.velY += (mvy - mapManager.velY) * 0.1;

    this.sightMarker.point.x = this.marker.point.x;
    this.sightMarker.point.y = this.marker.point.y + SIGHT_DISTANCE;
    this.marker.redraw(true);
    this.sightMarker.redraw(true);

    if (this.blasterCnt <= 0 && key[KEY_SHOT]) {
      this.blasterCnt = 15;
      this.impactMarker.point.x = this.sightMarker.point.x;
      this.impactMarker.point.y = this.sightMarker.point.y;
      this.blasterMarker.point.x = this.marker.point.x;
      this.blasterMarker.point.y = this.marker.point.y;
      map.addOverlay(this.impactMarker);
      map.addOverlay(this.blasterMarker);
    }
    if (this.blasterCnt > 0) {
      this.blasterMarker.point.y += 0.000055;
      this.blasterMarker.redraw(true);
      this.blasterCnt--;
      if (this.blasterCnt <= 0) {
        map.removeOverlay(this.impactMarker);
        map.removeOverlay(this.blasterMarker);
        this.blasterExplosion.set(this.impactMarker.point, true);
        checkTurretsHit(this.impactMarker.point);
      }
    }
    this.blasterExplosion.update();
    this.shipExplosion.update();
  }

  this.checkHit = function(p) {
    if (Math.abs(p.x - this.marker.point.x) < 0.00005 &&
        Math.abs(p.y - this.marker.point.y) < 0.00005)
      this.destroyed();
  }

  this.destroyed = function() {
    this.shipExplosion.set(this.marker.point, false);
  }
}

// Handling a key input.
var keyMap = new Array(256);
var key = [false, false, false, false, false];
var KEY_UP = 0;
var KEY_LEFT = 1;
var KEY_DOWN = 2;
var KEY_RIGHT = 3;
var KEY_SHOT = 4;
keyMap[38] = KEY_UP + 1;
keyMap[37] = KEY_LEFT + 1;
keyMap[40] = KEY_DOWN + 1;
keyMap[39] = KEY_RIGHT + 1;
keyMap[90] = KEY_SHOT + 1;

document.onkeydown = function(e) {
  var kc = (window.event) ? event.keyCode : e.keyCode;
  setKey(kc, true);
}

document.onkeyup = function(e) {
  var kc = (window.event) ? event.keyCode : e.keyCode;
  setKey(kc, false);
}

setKey = function(kc, v) {
  if (kc < 256) {
    km = keyMap[kc];
    if (km > 0)
      key[km - 1] = v;
  }
}