/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * A Provider implementation which saves and retrieves state via cookies. The CookieProvider supports the usual cookie
 * options, such as:
 *
 * - {@link #path}
 * - {@link #expires}
 * - {@link #domain}
 * - {@link #secure}
 *
 * Example:
 *
 *     var cp = Ext.create('Ext.state.CookieProvider', {
 *         path: "/cgi-bin/",
 *         expires: new Date(new Date().getTime()+(1000*60*60*24*30)), //30 days
 *         domain: "sencha.com"
 *     });
 *
 *     Ext.state.Manager.setProvider(cp);
 *
 */
Ext.define('Ext.state.CookieProvider', {
    extend: 'Ext.state.Provider',

    /**
     * @cfg {String} path
     * The path for which the cookie is active. Defaults to root '/' which makes it active for all pages in the site.
     */

    /**
     * @cfg {Date} expires
     * The cookie expiration date. Defaults to 7 days from now.
     */

    /**
     * @cfg {String} domain
     * The domain to save the cookie for. Note that you cannot specify a different domain than your page is on, but you can
     * specify a sub-domain, or simply the domain itself like 'sencha.com' to include all sub-domains if you need to access
     * cookies across different sub-domains. Defaults to null which uses the same domain the page is running on including
     * the 'www' like 'www.sencha.com'.
     */

    /**
     * @cfg {Boolean} [secure=false]
     * True if the site is using SSL
     */

    /**
     * Creates a new CookieProvider.
     * @param {Object} [config] Config object.
     */
    constructor : function(config){
        var me = this;
        me.path = "/";
        me.expires = new Date(Ext.Date.now() + (1000*60*60*24*7)); //7 days
        me.domain = null;
        me.secure = false;
        me.callParent(arguments);
        me.state = me.readCookies();
    },

    // private
    set : function(name, value){
        var me = this;

        if(typeof value == "undefined" || value === null){
            me.clear(name);
            return;
        }
        me.setCookie(name, value);
        me.callParent(arguments);
    },

    // private
    clear : function(name){
        this.clearCookie(name);
        this.callParent(arguments);
    },

    // private
    readCookies : function(){
        var cookies = {},
            c = document.cookie + ";",
            re = /\s?(.*?)=(.*?);/g,
            prefix = this.prefix,
            len = prefix.length,
            matches,
            name,
            value;

        while((matches = re.exec(c)) != null){
            name = matches[1];
            value = matches[2];
            if (name && name.substring(0, len) == prefix){
                cookies[name.substr(len)] = this.decodeValue(value);
            }
        }
        return cookies;
    },

    // private
    setCookie : function(name, value){
        var me = this;

        document.cookie = me.prefix + name + "=" + me.encodeValue(value) +
           ((me.expires == null) ? "" : ("; expires=" + me.expires.toGMTString())) +
           ((me.path == null) ? "" : ("; path=" + me.path)) +
           ((me.domain == null) ? "" : ("; domain=" + me.domain)) +
           ((me.secure == true) ? "; secure" : "");
    },

    // private
    clearCookie : function(name){
        var me = this;

        document.cookie = me.prefix + name + "=null; expires=Thu, 01-Jan-70 00:00:01 GMT" +
           ((me.path == null) ? "" : ("; path=" + me.path)) +
           ((me.domain == null) ? "" : ("; domain=" + me.domain)) +
           ((me.secure == true) ? "; secure" : "");
    }
});
