// cookies.js
// from Flanagan, JavaScript: The Definitive Guide, 2e, O'Reilly, 1997.
// Chapter 15, p 231.

// $Id: cookies.js,v 1.5 2000/09/13 17:52:16 neilk Exp $

function Cookie(document, name, hours, path, domain, secure)
{
    this.$document = document;
    this.$name = name;
    if (hours)
        this.$expiration = new Date((new Date()).getTime() + hours*3600000);
    else this.$expiration = null;
    if (path) this.$path = path; else this.$path = null;
    if (domain) this.$domain = domain; else this.$domain = null;
    if (secure) this.$secure = true; else this.$secure = false;
}

function _Cookie_store()
{
    var cookieval = "";
    for(var prop in this) {
        if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function')) 
            continue;
        if (cookieval != "") cookieval += '&';
        cookieval += prop + escape(':') + escape(this[prop]);
    }

    var cookie = this.$name + '=' + cookieval;
    if (this.$expiration)
        cookie += '; expires=' + this.$expiration.toGMTString();
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    if (this.$secure) cookie += '; secure';

    // Now store the cookie by setting the magic Document.cookie property.
    this.$document.cookie = cookie;
}


function _Cookie_load()
{
    // unescape the cookie at the outset
    var allcookies = unescape(this.$document.cookie);
    if (allcookies == "") return false;
    
    //alert(allcookies);

    var start = allcookies.indexOf(this.$name + '=');
    if (start == -1) return false;
    start += this.$name.length + 1;
    var end = allcookies.indexOf(';', start);
    if (end == -1) end = allcookies.length;
    var cookieval = allcookies.substring(start, end);

    var a = cookieval.split('&');
    for(var i=0; i < a.length; i++)
        a[i] = a[i].split(':');

    for(var i = 0; i < a.length; i++) {
        // don't need to unescape each var here...
        // this[a[i][0]] = unescape(a[i][1]);
	this[a[i][0]] = a[i][1];
     }

    return true;
}


function _Cookie_remove()
{
    var cookie;
    cookie = this.$name + '=';
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT';

    this.$document.cookie = cookie;
}

new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;