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/**
 * @fileoverview  This file defines the Arrow class.
 */

/**
 * An arrow that Io can shoot.
 */
function Arrow(initObj) {
  this.absorbNamedValues(initObj);

  // Hide myself by moving way off the screen.
  this.z = -10000;
  this.mapX = -10000;
  this.width = 40;
  this.height = 1;
  this.velX = 0;

  // Figure out which arrow number I am.
  this.arrowNumber = parseInt(initObj.name.substr(initObj.name.length-1,1));

}
Arrow.prototype = new Actor;

Arrow.prototype.onTick = function(timeElapsed) {
  if (this.mapX < avatar.mapX-500 || this.mapX > avatar.mapX+500 &&
      this.z > -10000) {
    // then hide ourselves way off screen.
    this.mapX = -10000;
    this.z = -10000;
    updateActor(this);
  } else {
    // Here's how I move. moveMapX is a handy function that updates both
    // my "virtual 2d world" mapX, as well as my literal x + y values
    this.moveMapX(this.velX)
    updateActor(this);
  }
}

Arrow.prototype.shoot = function() {
  this.x = avatar.x;
  this.y = avatar.y;
  this.z = avatar.z + 33; // Approximate height of IO's crossbow.
  this.platformID = avatar.platformID;
  this.parentPlatformID = avatar.parentPlatformID;
  this.rotZ = world.platforms[this.platformID].rotZ;
  this.mapX = avatar.mapX;

  if (Math.abs(avatar.rotZ - this.rotZ) < Math.PI/2) {
    this.velX = 50;
  } else {
    this.velX = -50;
    this.rotZ -= Math.PI;
  }
  soundPlayer.play('sound/arrow.mp3', 100);
  updateActor(this);
}

// TODO: This should be a generic concept, not an arrow-specifc
// thing.
Arrow.prototype.hide = function() {
  this.mapX = -10000;
}