/**
 * 注册命名空间：baidu.network
 */
baidu.namespace.register("baidu.network");


/**
 * 后端网络处理，ajax等
 * @author zhaoxianlie 
 */
baidu.network = (function(){
    /**
     * 通过这个方法来读取服务器端的CSS文件内容，要这样做，前提是在manifest.json中配置permissions为：http://
     * @param {String} link 需要读取的css文件
     * @param {Function} callback 回调方法，格式为：function(respData){}
     * @config {Object} respData 输出到客户端的内容，格式为{success:BooleanValue,content:StringValue}
     * @return {Undefined} 无返回值
     */
    var _readFileContent = function(link,callback){
        //创建XMLHttpRequest对象，用原生的AJAX方式读取内容
        var xhr = new XMLHttpRequest();
        //处理细节
        xhr.onreadystatechange = function() {
            //后端已经处理完成，并已将请求response回来了
            if (xhr.readyState === 4) {
                //输出到客户端的内容，格式为{success:BooleanValue,content:StringValue}
                var respData;
                //判断status是否为OK
                if (xhr.status === 200 && xhr.responseText) {
                    //OK时回送给客户端的内容
                    respData = {
                        success : true,	//成功
                        type : FILE.LINK,	//<link>标签
                        path : link,	//文件路径
                        content : xhr.responseText	//文件内容
                    };
                } else {	//失败
                    respData = {
                        success : false,	//失败
                        type : FILE.LINK,	//<link>标签
                        path : link,	//文件路径
                        content : "FcpHelper can't load such file."	//失败信息
                    };
                }
                //触发回调，并将结果回送
                callback(respData);
            }
        };
        //打开读通道
        xhr.open('GET', link, true);
        //设置HTTP-HEADER
        xhr.setRequestHeader("Content-Type","text/plain;charset=UTF-8");
        xhr.setRequestHeader("Access-Control-Allow-Origin","*");
        //开始进行数据读取
        xhr.send();
    };
	
    /**
     * 从cookie中获取url
     * @param {Object} cookie
     */
    var _urlFromCookie = function(cookie){
        return "http" + (cookie.secure ? "s" : "") + "://" + cookie.domain + cookie.path;
    };

	/**
	 * 获取页面上的所有cookie
	 * @param {Object} callback
	 */
	var _getCookies = function(request,callback){
		var arrCookies = [];
		chrome.cookies.getAll({}, function(cookies){
			for(var i=0,le=cookies.length;i<le;i++){
				if(request.url.indexOf(cookies[i].domain.substring(1)) > -1) {
					cookies[i].url = _urlFromCookie(cookies[i]);
					arrCookies.push(cookies[i]);
				}
			}
			
			//排序
			cookies.sort(function (a, b) { return a.domain.localeCompare(b.domain); });
			
			callback.call(null,{
				cookie : arrCookies
			});	
        });
	};
	
	/**
	 * 移除某个cookie
	 * @param {Object} request
	 * @param {Object} callback
	 */
	var _removeCookie = function(request,callback){
		chrome.cookies.getAll({}, function(cookies){
			for(var i=0,le=cookies.length;i<le;i++){
				var url = _urlFromCookie(cookies[i]);
				var name = cookies[i].name;
				if(url == request.url && name == request.name) {
					chrome.cookies.remove({"url": url, "name": name});
					if(callback && typeof callback == "function") {
						callback.call(null);
					}
					return;
				}
			}
        });
	};
	
	/**
	 * 设置某个cookie
	 * @param {Object} request
	 * @param {Object} callback
	 */
	var _setCookie = function(request,callback){
		chrome.cookies.getAll({}, function(cookies){
			for(var i=0,le=cookies.length;i<le;i++){
				var url = _urlFromCookie(cookies[i]);
				var name = cookies[i].name;
				if(url == request.url && name == request.name) {
					chrome.cookies.set(request);
					if(callback && typeof callback == "function") {
						callback.call(null);
					}
					return;
				}
			}
        });
	};
	
	return {
		readFileContent : _readFileContent,
		getCookies : _getCookies,
		removeCookie : _removeCookie,
		setCookie : _setCookie
	};
})();