/**
 * Cookie plugin
 *
 * Copyright www.ebiz163.com
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */

/**
 * Create a cookie with the given name and value and other optional parameters.
 *
 * @example $.cookie('the_cookie', 'the_value');
 * @desc Set the value of a cookie.
 * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
 * @desc Create a cookie with all available options.
 * @example $.cookie('the_cookie', 'the_value');
 * @desc Create a session cookie.
 * @example $.cookie('the_cookie', null);
 * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
 *       used when the cookie was set.
 *
 * @param String name The name of the cookie.
 * @param Object value The value of the cookie.
 * @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
 * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
 *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
 *                             If set to null or omitted, the cookie will be a session cookie and will not be retained
 *                             when the the browser exits.
 * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
 * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
 * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
 *                        require a secure protocol (like HTTPS).
 * @type undefined
 *
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

/**
 * Get the value of a cookie with the given name.
 *
 * @example $.cookie('the_cookie');
 * @desc Get the value of a cookie.
 *
 * @param String name The name of the cookie.
 * @return The value of the cookie.
 * @type String
 *
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

 
jQuery.cookie = function(key, value, options) {

	if (typeof value != 'undefined') { // name and value given, set cookie         
         options = options || {};
		 if (value === null) {
            value = '';
            options.expires = -1;
        }else
			value = encodeValue(value);


        var expires = '';
        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
            var date;
            if (typeof options.expires == 'number') {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            } else {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
        }
        // CAUTION: Needed to parenthesize options.path and options.domain
        // in the following expressions, otherwise they evaluate to undefined
        // in the packed version for some reason...
        var path = options.path ? '; path=' + (options.path) : '';
        var domain = options.domain ? '; domain=' + (options.domain) : '';
        var secure = options.secure ? '; secure' : '';
        document.cookie = [key, '=', value, expires, path, domain, secure].join('');

	}else {
		var cookies = {};
		var c = document.cookie + ";";

		var re = /\s?(.*?)=(.*?);/g;
		var matches;
		while ((matches = re.exec(c)) != null) {
			var name = matches[1];
			var value = matches[2];
			if (name  == key) {
				return decodeValue(value);
			}
		}
		return null;
	}

  /** -----------------------private-------------------------------------- function */
	
 function encodeValue(v) {
        var enc;
	if (typeof v == "number") {
		enc = "n:" + v;
	} else if (typeof v == "boolean") {
		enc = "b:" + (v ? "1" : "0");
	} else if (v instanceof Date) {
		enc = "d:" + v.toGMTString();
	} else if (v instanceof Array) {
		var flat = "";
		for (var i = 0, len = v.length; i < len; i++) {
			flat += encodeValue(v[i]);
			if (i != len - 1)
				flat += "^";
		}
		enc = "a:" + flat;
	} else if (typeof v == "object") {
		var flat = "";
		for (var key in v) {
			if (typeof v[key] != "function" && v[key] !== undefined) {
				flat += key + "=" + encodeValue(v[key]) + "^";
			}
		}
		enc = "o:" + flat.substring(0, flat.length - 1);
	} else {
		enc = "s:" + v;
	}
	return escape(enc);

}

function decodeValue (cookie) {
	var re = /^(a|n|d|b|s|o)\:(.*)$/;
	var matches = re.exec(unescape(cookie));
	if (!matches || !matches[1])
		return; // non state cookie
	var type = matches[1];
	var v = matches[2];
	switch (type) {
		case "n" :
			return parseFloat(v);
		case "d" :
			return new Date(Date.parse(v));
		case "b" :
			return (v == "1");
		case "a" :
			var all = [];
			var values = v.split("^");
			for (var i = 0, len = values.length; i < len; i++) {
				all.push(decodeValue(values[i]));
			}
			return all;
		case "o" :
			var all = {};
			var values = v.split("^");
			for (var i = 0, len = values.length; i < len; i++) {
				var kv = values[i].split("=");
				all[kv[0]] = decodeValue(kv[1]);
			}
			return all;
		default :
			return v;
	}
}

}


jQuery.fn.decookie = function(){
	var tag = $(this).attr("tagName");
	switch (tag)
	{
	case 'FORM' :
	    $(this).decookieForm();
	    break;
	case 'UL':
        $(this).decookieOrder();
	    break;
	default:
		alert('不支持此DOM的cookie操作');
	    break;
	}

}


jQuery.fn.cookie = function(){
	var tag = $(this).attr("tagName");
	switch (tag)
	{
	case 'FORM' :
	    $(this).cookieForm();
	    break;
	case 'UL':
        $(this).cookieOrder();
	    break;
	default:
		alert('不支持此DOM的cookie操作');
	    break;
	}
}


/**
 * 从cookie中还原Form
 */
jQuery.fn.decookieForm = function(){
	if($(this).attr("tagName") != 'FORM'){
       alert('此方法只支持form的cookie操作');
	   return;
	}


	var object 
	
	var formName = $(this).attr("name");


	cookies = jQuery.cookie(formName);

	
	if(!cookies || cookies.length <= 0)
	    return;
	
	$('input, textarea, select,', this).each(function() {
		var elementID = this.id;

		var type = this.type;
		
		disabled = this.disabled;
		
		val = cookies[elementID] || "";
		
		if (!disabled) {
			switch (type) {
				case 'textarea':
				case 'text' :
					this.value = val;
					break;
				case 'select-one' :
				case 'select-multiple' :
					$(this).select(val);
					break;
				case 'radio' :
				case 'checkbox' :
					this.checked = !!val;
					break;
				default :
					break;
			}
		}
	});
	
	
}


/**
 * 保存Form的各个Field值到cookie中
 */
jQuery.fn.cookieForm = function(){
	if($(this).attr("tagName") != 'FORM'){
       alert('此方法只支持form的cookie操作');
	    return;
	}

	var formName = $(this).attr("name");
	var formObj = {};
	$('input, textarea, select,', this).each(function() {
        var type = this.type;

		if (this.tagName == 'INPUT'&& type != 'text' && type != 'radio' && type != 'checkbox')
		{
			return;
		}
		
		var value = this.value;

		if(type == 'select-multiple'){
			value = $(this).select();
		}
		
		var elementID = this.id;
		
		if (!elementID) {
			alert("this element didn't have ID, could not be cookied,name:"
				+ name);
			return;
		}
		
		if ((type == 'radio' || type == 'checkbox') && !this.checked){
				value = '';
		}
		
		formObj[this.id] = value;
	});

	jQuery.cookie(formName, formObj);

	
}


/**
 * 如果不输入values参数，函数返回下拉框的单选或多选的值
 * 如果输入values参数, 则用values选中下拉框中符合的值
 */
jQuery.fn.select = function(values) {

	if(!values){
	   values = [];
	   jQuery('option:selected', this).each(function(){
         values.push(this.value);
	   });

	   return values;
	}

	if (!(values instanceof Array)) {
		values = [values];
	}

	jQuery('option', this).each(function(){
		this.selected = false;

		if (jQuery.inArray(this.value, values) >= 0 ){
			this.selected = true;
		}
	});
}




/**
 * 将list的顺序记录到cookie中
 */
jQuery.fn.cookieOrder = function() {
	// save custom order to cookie
	var key = $(this).attr("id");
	$.cookie(key, $(this).sortable("toArray"));
}

/**
 * 从cookie中恢复list的顺序
 */
jQuery.fn.decookieOrder = function() {
	var list = $(this);
	if (list == null) return
	
	// fetch the cookie value (saved order)
	var key = $(this).attr("id");
	
	var IDs = $.cookie(key);
	

	if (!IDs) return;
	//IDs = IDs.split(",");
	
	// fetch current order
	var items = list.sortable("toArray");
	
	// make array from current order
	var rebuild = new Array();
	for ( var v=0, len=items.length; v<len; v++ ){
		rebuild[items[v]] = items[v];
	}
	
	for (var i = 0, n = IDs.length; i < n; i++) {
		
		// item id from saved order
		var itemID = IDs[i];
		
		if (itemID in rebuild) {
		
			// select item id from current order
			var item = rebuild[itemID];
			
			// select the item according to current order
			var child = $("ul.ui-sortable").children("#" + item);
			
			// select the item according to the saved order
			var savedOrd = $("ul.ui-sortable").children("#" + itemID);
			
			// remove all the items
			child.remove();
			
			// add the items in turn according to saved order
			// we need to filter here since the "ui-sortable"
			// class is applied to all ul elements and we
			// only want the very first!  You can modify this
			// to support multiple lists - not tested!
			$("ul.ui-sortable").filter(":first").append(savedOrd);
		}
	}
}