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//
//  Cookie Functions - "Night of the Living Cookie"
//  Version (25-Jul-96)
//  
//  Written by:  Bill Dortch, hIdaho Design
//  <bdortch@hidaho.com> 
//  
//  The following functions are released to the
//  public domain.
//
//  This version takes a more aggressive approach
//  to deleting cookies.  Previous versions set
//  the expiration date to one millisecond prior
//  to the current time; however, this method did
//  not work in Netscape 2.02 (though it does in
//  earlier and later versions), resulting in
//  "zombie" cookies that would not die.
//  DeleteCookie now sets the expiration date to
//  the earliest usable date (one second into
//  1970), and sets the cookie's value to null
//  for good measure.
//
//  Also, this version adds optional path and
//  domain parameters to the DeleteCookie
//  function.  If you specify a path and/or
//  domain when creating (setting) a cookie**,
//  you must specify the same path/domain when
//  deleting it, or deletion will not occur.
//
//  The FixCookieDate function must now be called
//  explicitly to correct for the 2.x Mac date
//  bug.  This function should be called *once*
//  after a Date object is created and before it
//  is passed (as an expiration date) to
//  SetCookie.  Because the Mac date bug affects
//  all dates, not just those passed to
//  SetCookie, you might want to make it a habit
//  to call FixCookieDate any time you create a
//  new Date object:
//
//    var theDate = new Date();
//    FixCookieDate (theDate);
//
//  Calling FixCookieDate has no effect on
//  platforms other than the Mac, so there is no
//  need to determine the user's platform prior
//  to calling it.
//
//  This version also incorporates several minor
//  coding improvements.
//
//  **Note that it is possible to set multiple
//  cookies with the same name but different
//  (nested) paths.  For example:
//
//    SetCookie ("color","red",null,"/outer");
//    SetCookie ("color","blue",null,"/outer/inner");
//
//  However, GetCookie cannot distinguish between
//  these and will return the first cookie that
//  matches a given name.  It is therefore
//  recommended that you *not* use the same name
//  for cookies with different paths.  (Bear in
//  mind that there is *always* a path associated
//  with a cookie; if you don't explicitly
//  specify one, the path of the setting document
//  is used.)
//  
//  Revision History:
//
//    "Toss Your Cookies" Version (22-Mar-96)
//      - Added FixCookieDate() function to
//        correct for Mac date bug
//
//    "Second Helping" Version (21-Jan-96)
//      - Added path, domain and secure
//        parameters to SetCookie
//      - Replaced home-rolled encode/decode
//        functions with Netscape's new (then)
//        escape and unescape functions
//
//    "Free Cookies" Version (December 95)
//
//
//  For information on the significance of cookie
//  parameters, and on cookies in general,
//  please refer to the official cookie spec, at:
//
//  http://www.netscape.com/newsref/std/cookie_spec.html
//
//*************************************************
//
// "Internal" function to return the decoded
//  value of a cookie
//
function getCookieVal (offset) {
  var endstr = 
    document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}
//
//  Function to correct for 2.x Mac date bug.
//  Call this function to fix a date object prior
//  to passing it to SetCookie.  IMPORTANT: This
//  function should only be called *once* for any
//  given date object!  See example at the end of
//  this document.
//
function FixCookieDate (date) {
  var base = new Date(0);
  var skew = base.getTime(); // dawn of (Unix)
                             //  time-should be 0
  if (skew > 0)
    // Except on the Mac - ahead of its time
    date.setTime (date.getTime() - skew);
}
//
//  Function to return the value of the cookie
//  specified by "name".
//  
//    name - String object containing the cookie
//           name. 
//    returns - String object containing the
//           cookie value, or null if the cookie
//           does not exist.
//
function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
      return getCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break; 
  }
  return null;
}
//
//  Function to create or update a cookie.
//    name - String object containing the cookie
//           name.
//    value - String object containing the cookie
//           value.  May contain any valid string
//           characters.
//    [expires] - Date object containing the
//           expiration data of the cookie.  If
//           omitted or null, expires the cookie
//           at the end of the current session.
//    [path] - String object indicating the path
//           for which the cookie is valid. If
//           omitted or null, uses the path of
//           the calling document.
//    [domain] - String object indicating the
//           domain for which the cookie is
//           valid.  If omitted or null, uses the
//           domain of the calling document.
//    [secure] - Boolean (true/false) value
//           indicating whether cookie
//           transmission requires a secure
//           channel (HTTPS).
//
//  The first two parameters are required.  The
//  others, if supplied, must be passed in the
//  order listed above.  To omit an unused
//  optional field, use null as a place holder.
//  For example, to call SetCookie using name,
//  value and path, you would code:
//
//      SetCookie ("myCookieName", 
//                 "myCookieValue", null, "/");
//
//  Note that trailing omitted parameters do not
//  require a placeholder.
//
//  To set a secure cookie for path "/myPath",
//  that expires after the current session, you
//  might code:
//
//      SetCookie (myCookieVar, cookieValueVar, 
//                 null, "/myPath", null, true);
//
function SetCookie (name, value, expires, path, 
                    domain, secure) {
  document.cookie = 
    name + "=" + escape (value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

//  Function to delete a cookie. (Sets expiration
//  date to start of epoch)
//    name -   String object containing the
//             cookie name 
//    path -   String object containing the path
//             of the cookie to delete.  This
//             MUST be the same as the path used
//             to create the cookie, or
//             null/omitted if no path was
//             specified when creating the
//             cookie. 
//    domain - String object containing the
//             domain of the cookie to delete.
//             This MUST be the same as the
//             domain used to create the cookie,
//             or null/omitted if no domain was
//             specified when creating the
//             cookie.
//
function DeleteCookie (name,path,domain) {
  if (GetCookie(name)) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}


//
// Local variables and functions
//


// global variable to count the number of to do
// cookies set. 
var numberOfCookies = 0

// A document onLoad event handler to obtain the
// number of cookies in the to do list and load
// the selection list with their values.
//
function getNumberOfCookies() {
  numberOfCookies = GetCookie("todoNumber")

  // Load the selection list if necessary.
  if (numberOfCookies > 0 ) {
    var select = document.todoForm.items.options

    for (var i = 0; i <= numberOfCookies; i++) {
      var value = GetCookie("todo" + i)
      select[select.length] = 
        new Option(unescape(value),"",false,false)
    }
  }
}

// Add a to do item to the list.
//
function addToDoCookie(theForm) {
  if (theForm.item.value.length <= 0) {
    alert("Please enter a new item.")
    return false
  } else {
    var expdate = new Date();
    var select  = document.todoForm.items.options

    // Fix the date and set the cookies to expire
    // 24 hours from now.
    FixCookieDate(expdate)
    expdate.setTime(expdate.getTime() + 
      (24 * 60 * 60 * 1000))

    // Set the cookies
    SetCookie("todo" + numberOfCookies, 
               theForm.item.value, expdate)
    SetCookie("todoNumber",numberOfCookies,expdate)
    numberOfCookies++

    // Add the item to the selection list
    select[select.length] = 
      new Option(theForm.item.value,"",false,false)
    return true
  }
}

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