// ==UserScript==
// @name Google Calendar daytime
// @author mallowlabs
// @version 0.0.3
// @namespace http://mallowlabs.s206.xrea.com/
// @published 2008-01-10
// @modified 2008-04-11
// @license public domain
// @description : Add daytime to Google Calendar
// @include         http://calendar.google.com/*
// @include         http://www.google.com/calendar*
// @include         http://google.com/calendar*
// ==/UserScript==

(function(document) {
var start_work = 8;
var end_work = 18;

// avoid frame
if (window.self != window.parent) return;
var w = this.unsafeWindow || window;

// -- http://userscripts.org/scripts/show/7873
var view = null;
var countVisibleDays = function() {
  if (view == null) {
    for (var i in w) {
      var x = w[i];
      if (x && typeof x.type == "number") {
        view = x;
        break;
      }
    }
  }
  if (view == null) return 0;
  return parseInt(view.toString().match(/extent: (¥d+)/)[1]);
};

var createGray = function(parent, left, width, classname) {
  var div = document.createElement("div");
  div.setAttribute("class", classname);
  var style = div.style;
  style.height = "2em";
  style.left = left + "%";
  style.width = width + "%";
  style.backgroundColor = "#ddd";
  style.opacity = "0.4";
  style.position = "absolute";
  if (parent.getElementsByClassName("_gray").length == 0) {
    parent.appendChild(div);
  }
  return div;
}

var isBusy = false;
var onAttrModified = function() {
  if (isBusy) return;
  var days = countVisibleDays();
  if (days > 7) return;
  isBusy = true;

  var markers = document.getElementsByClassName("tg-dualmarker");
  var length = markers.length;
  for (var i = 0; i < length; i++) {
    if (i < start_work || end_work <= i) {
      createGray(markers[i], 0, 100.0, "_gray");
    } else if (days != 1) {
      createGray(markers[i], 0, 100.0/7.0, "");
      createGray(markers[i], 100.0 * 6.0 / 7.0, 100.0/7.0, "_gray");
    }
  }
  isBusy = false;
}
document.addEventListener("DOMNodeInserted", onAttrModified, false);
})(document);