/**
 * @file   common/js/xml_handler.js
 * @author zero <zero@nzeo.com>
 * @brief  ajax 사용을 위한 기본 js
 **/

// xml handler을 이용하는 user function
function exec_xml(module, act, params, callback_func, response_tags, callback_func_arg, fo_obj) {
    var oXml = new xml_handler();
    oXml.reset();
    for(var key in params) {
        var val = params[key];
        oXml.addParam(key, val);
    }
    oXml.addParam("module", module);
    oXml.addParam("act", act);

    response_tags[response_tags.length] = "redirect_url";

    var waiting_obj = document.getElementById("waitingforserverresponse");
    waiting_obj.style.visibility = "visible";
    oXml.request(xml_response_filter, oXml, callback_func, response_tags, callback_func_arg, fo_obj);
}

// 결과 처리 후 callback_func에 넘겨줌
function xml_response_filter(oXml, callback_func, response_tags, callback_func_arg, fo_obj) {
    var xmlDoc = oXml.getResponseXml();
    if(!xmlDoc) return null;

    var waiting_obj = document.getElementById("waitingforserverresponse");
    waiting_obj.style.visibility = "hidden";

    var ret_obj = oXml.toZMsgObject(xmlDoc, response_tags);
    if(ret_obj["error"]!=0) {
        alert(ret_obj["message"]);
        return;
    }

    callback_func(ret_obj, response_tags, callback_func_arg, fo_obj);
}

// xml handler
function xml_handler() {
    this.obj_xmlHttp = null;
    this.method_name = null;
    this.xml_path = "./index.php";

    this.params = new Array();

    this.reset = xml_handlerReset;
    this.getXmlHttp = zGetXmlHttp;
    this.request = xml_handlerRequest;
    this.setPath = xml_handlerSetPath;
    this.addParam = xml_handlerAddParam;
    this.getResponseXml = xml_handlerGetResponseXML;
    this.toZMsgObject = xml_handlerToZMsgObject;

    this.obj_xmlHttp = this.getXmlHttp();
}

function zGetXmlHttp() {
    if (window.XMLHttpRequest) return new XMLHttpRequest();
    else if (window.ActiveXObject) {
        try {
            return new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            return new ActiveXObject("Microsoft.XMLHTTP");
        }
    }       
    return null;
}

function xml_handlerRequest(callBackFunc, xmlObj, callBackFunc2, response_tags, callback_func_arg, fo_obj) {
    var rd = "";
    rd += "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n"
    +  "<methodCall>\n"
    +  "<params>\n"

    for (var key in this.params) {
        var val = this.params[key];
        rd += "<"+key+"><![CDATA["+val+"]]></"+key+">\n";
    }

    rd += "</params>\n"
    +  "</methodCall>\n";

    if(this.obj_xmlHttp.readyState!=0) {
        this.obj_xmlHttp.abort();
        this.obj_xmlHttp = this.getXmlHttp();
    }
    this.obj_xmlHttp.onreadystatechange = function () {callBackFunc(xmlObj, callBackFunc2, response_tags, callback_func_arg, fo_obj)};
    this.obj_xmlHttp.open("POST", this.xml_path, true);
    this.obj_xmlHttp.send(rd);
}

function xml_handlerSetPath(path) {
    this.xml_path = "./"+path;
}


function xml_handlerReset() {
    this.obj_xmlHttp = this.getXmlHttp();
    this.params = new Array();
}

function xml_handlerAddParam(key, val) {
    this.params[key] = val;
}

function xml_handlerGetResponseXML() {
    if(this.obj_xmlHttp && this.obj_xmlHttp.readyState == 4 && isDef(this.obj_xmlHttp.responseXML)) {
        var xmlDoc = this.obj_xmlHttp.responseXML;
        this.reset();
        return xmlDoc;
    }
    return null;
}

function xml_handlerToZMsgObject(xmlDoc, tags) {
    if(!xmlDoc) return null;
    if(!tags) {
        tags = new Array("error","message");
    }
    var obj_ret = new Array();
    for(var i=0; i<tags.length; i++) {
        try {
            obj_ret[tags[i]] = xmlDoc.getElementsByTagName(tags[i])[0].firstChild.nodeValue;
        } catch(e) {
            obj_ret[tags[i]] = "";
        }
    }
    return obj_ret;
}