$(function(exports) {
  exports.sample = exports.sample || {};
  var module = exports.sample;

  /**
   * 画像の読み込みを管理
   *
   * @constructor
   */
  module.ImageManager = function(){

  };
  //-----------------------------------------
  // Header
  //-----------------------------------------

  // リスナー管理
  module.ImageManager.listeners = {};

  /**
   * 画像読み込みを監視する。
   *
   * @param target
   * @param completeFunc
   * @param scope
   * @param origin
   */
  module.ImageManager.watch = function(target, completeFunc, scope, origin){
      var offset = new Date().getMilliseconds();
      if(module.ImageManager.listeners[target[0].src + offset]) return;
      var struct = new ImageStruct(target, completeFunc, scope, origin);
      module.ImageManager.listeners[target[0].src] = struct;
      struct.loadImage();
      return struct;
  };

  /**
   * 画像読み込み構造体
   *
   * @param target
   * @param scope
   * @param compFunc
   * @param args
   * @constructor
   */
  var ImageStruct = function(target, scope, compFunc, args){
      this.target = target;
      this.scope = scope;
      this.callBacks = [];
      this.addCallBack(scope, compFunc, args);
      this.counter = 0;
      this.counterMax = this.target.length;
  };

  /**
   * 画像読み込み
   */
  ImageStruct.prototype['loadImage'] = function(){
      var _this = this;
      this.target.each(function(key, image){
          image.orginSrc = image.src;
          image.src = "";

          $(image).bind("load", function(){
              _this.counter++;
              if(_this.counter == _this.counterMax){
                  //console.log("complete = ", _this.counter);
                  _this.execute();
              }
          });

          image.src = image.orginSrc;
      });
  };

  /**
   * コールバック処理の登録
   * @param scope
   * @param func
   * @param args
   */
  ImageStruct.prototype['addCallBack'] = function(scope, func, args){
      var callBack = new CallBack(scope, func, args);
      this.callBacks.push(callBack);
  };

  /**
   * コールバックを実行
   */
  ImageStruct.prototype['execute'] = function(){
      for(var i = 0; i < this.callBacks.length; ++i){
          var callBack = this.callBacks[i];
          callBack.execute();
      }
  };

  /**
   * コールバックオブジェクト
   * @param scope
   * @param func
   * @param args
   * @constructor
   */
  var CallBack = function(scope, func, args) {
      this.scope = scope;
      this.func = func;
      this.args = args;
  }

  /**
   * コールバック処理を実行
   */
  CallBack.prototype['execute'] = function(){
      this.func.apply(this.scope, [this.args]);
  }
});