// BlzCookie.js
//
// Bullseye is freely distributable under the terms of new BSD license.
// Copyright (c) 2006-2008, makoto_kw (makoto.kw@gmail.com) All rights reserved.

/* Browser Detection ----------------------------------------------------------------------------- */
var _BROWSER_IS_IE =
    (document.all
     && window.ActiveXObject
     && navigator.userAgent.toLowerCase().indexOf("msie") > -1
     && navigator.userAgent.toLowerCase().indexOf("opera") == -1);

/**
 * I hate navigator string based browser detection too, but when Opera alone
 * chokes on cookies containing double quotes...
 */
var _BROWSER_IS_OPERA =
    (navigator.userAgent.toLowerCase().indexOf("opera") != -1);

Blz.Cookie = Class.create();
Blz.Cookie.prototype = {
    userDataForIE: false,
    initialize: function(userDataForIE) {
      this.cookieShelfLife = 365;
      this.userDataForIE = userDataForIE;
      // Internet Explorer has a cookie handling bug - if the *combined size*
      // of all cookies stored for a given domain is greater than 4096 bytes,
      // document.cookie will return an empty string. Until this is fixed , we
      // will fall back on IE's proprietary userData behaviour.
      if (_BROWSER_IS_IE && this.userDataForIE) {
        this.IE_CACHE_NAME = "storage";
        if ($(this.IE_CACHE_NAME) == null) {
          var div = document.createElement("DIV");
          div.id = this.IE_CACHE_NAME;
          document.body.appendChild(div);
        }
        this.store = $(this.IE_CACHE_NAME);
        this.store.style.behavior = "url('#default#userData')";
      }
    },

    /**
     * Returns the value of a cookie with the given name, or <code>null</code>
     * if no such cookie exists.
     */
    getCookie: function(aCookieName) {
      var result = null;
      if (_BROWSER_IS_IE && this.userDataForIE) {
        this.store.load(this.IE_CACHE_NAME);
        result = this.store.getAttribute(aCookieName);
      } else {
        for (var i = 0; i < document.cookie.split('; ').length; i++) {
          var crumb = document.cookie.split('; ')[i].split('=');
          if (crumb[0] == aCookieName && crumb[1] != null) {
            result = crumb[1];
            break;
          }
        }
      }
      if (_BROWSER_IS_OPERA && result != null) {
        result = result.replace(/%22/g, '"');
      }
      return result;
    },
    /** Sets a cookie with the given name and value. */
    setCookie: function(aCookieName, aCookieValue, aCookieDomain) {
      if (_BROWSER_IS_IE && this.userDataForIE) {
        this.store.setAttribute(aCookieName, aCookieValue);
        this.store.save(this.IE_CACHE_NAME);
      } else {
        if (_BROWSER_IS_OPERA) {
          aCookieValue = aCookieValue.replace(/"/g, "%22");
        }
        var date = new Date();
        date.setTime(date.getTime() + (this.cookieShelfLife * 24*60*60*1000));
        var expires = '; expires=' + date.toGMTString();
        var domain = (aCookieDomain) ? "; domain=" + aCookieDomain : "";
        document.cookie = aCookieName + '=' + aCookieValue + domain + expires + '; path=/';
      }
    },
    /** Clears the cookie with the given name. */
    clearCookie: function(aCookieName) {
      if (_BROWSER_IS_IE && this.userDataForIE) {
        this.store.load(this.IE_CACHE_NAME);
        this.store.removeAttribute(aCookieName);
        this.store.save(this.IE_CACHE_NAME);
      } else {
        document.cookie = aCookieName + '=;expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/';
      }
    }
};