/*jslint devel:true, browser:true, indent:2, maxlen: 70 */
(function (window) {
  "use strict";
  var Condition, Listener, watcher;

  // Requires window.matchMedia: 
  // https://developer.mozilla.org/en/DOM/window.matchMedia
  if (typeof window.matchMedia === "undefined") { return; }

  Condition = function (mq, callback) {
    this.mq = window.matchMedia(mq);
    this.callback = function () {
      callback.call();
    };
  };
  Condition.prototype.matches = function () {
    return this.mq.matches;
  };

  Listener = function () {
    this.callbacks = [];
    this.cbLen = 0;
    this.runned = 0;
  };
  Listener.prototype.waitFor = function (condition) {
    this.callbacks.push(condition);
    this.cbLen += 1;
  };
  Listener.prototype.walk = function () {
    var toRun = [],
      i = this.cbLen,
      cb = this.callbacks;

    while (i) {
      i -= 1;
      if (cb[i]) {
        if (cb[i].matches()) {
          toRun.push(i);
        }
      }
    }

    return toRun;
  };
  Listener.prototype.execute = function (toRun) {
    var i = toRun.length;

    while (i) {
      i -= 1;
      this.callbacks[toRun[i]].callback.call();
      this.callbacks[toRun[i]] = '';
      this.runned += 1;
    }
  };
  Listener.prototype.investigate = function () {
    var toRun;
    toRun = this.walk();

    if (toRun.length) { this.execute(toRun); }

    if (this.runned === this.cbLen) {
      window.onresize = "";
    }
  };
  Listener.prototype.install = function () {
    var callback, wait, that = this;

    callback = function () {
      that.investigate();
    };

    window.onresize = function () {
      clearTimeout(wait);
      wait = setTimeout(callback, 333);
    };

    this.investigate();
  };

  watcher = new Listener();

  watcher.waitFor(new Condition(
    "all and (min-width: 801px)",
    function () {
      console.log("load delicicous bookmarks (we have room!)");
    }
  ));

  watcher.waitFor(new Condition(
    "all and (min-width: 1281px)",
    function () {
      console.log("load heavy pictures (we are on desktop!)");
    }
  ));

  watcher.install();
}(window));