/**
 * @ngdoc service
 * @name umbraco.services.xmlhelper
 * @function
 *
 * @description
 * Used to convert legacy xml data to json and back again
 */
function xmlhelper($http) {
    /*
     Copyright 2011 Abdulla Abdurakhmanov
     Original sources are available at https://code.google.com/p/x2js/

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
     */

    function X2JS() {
        var VERSION = "1.0.11";
        var escapeMode = false;

        var DOMNodeTypes = {
            ELEMENT_NODE: 1,
            TEXT_NODE: 3,
            CDATA_SECTION_NODE: 4,
            DOCUMENT_NODE: 9
        };

        function getNodeLocalName(node) {
            var nodeLocalName = node.localName;
            if (nodeLocalName == null) {
                nodeLocalName = node.baseName;
            } // Yeah, this is IE!! 

            if (nodeLocalName === null || nodeLocalName === "") {
                nodeLocalName = node.nodeName;
            } // =="" is IE too

            return nodeLocalName;
        }

        function getNodePrefix(node) {
            return node.prefix;
        }

        function escapeXmlChars(str) {
            if (typeof (str) === "string") {
                return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#x27;').replace(/\//g, '&#x2F;');
            } else {
                return str;
            }
        }

        function unescapeXmlChars(str) {
            return str.replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&quot;/g, '"').replace(/&#x27;/g, "'").replace(/&#x2F;/g, '\/');
        }

        function parseDOMChildren(node) {
            var result, child, childName;

            if (node.nodeType === DOMNodeTypes.DOCUMENT_NODE) {
                result = {};
                child = node.firstChild;
                childName = getNodeLocalName(child);
                result[childName] = parseDOMChildren(child);
                return result;
            }
            else {

                if (node.nodeType === DOMNodeTypes.ELEMENT_NODE) {
                    result = {};
                    result.__cnt = 0;
                    var nodeChildren = node.childNodes;

                    // Children nodes
                    for (var cidx = 0; cidx < nodeChildren.length; cidx++) {
                        child = nodeChildren.item(cidx); // nodeChildren[cidx];
                        childName = getNodeLocalName(child);

                        result.__cnt++;
                        if (result[childName] === null) {
                            result[childName] = parseDOMChildren(child);
                            result[childName + "_asArray"] = new Array(1);
                            result[childName + "_asArray"][0] = result[childName];
                        }
                        else {
                            if (result[childName] !== null) {
                                if (!(result[childName] instanceof Array)) {
                                    var tmpObj = result[childName];
                                    result[childName] = [];
                                    result[childName][0] = tmpObj;

                                    result[childName + "_asArray"] = result[childName];
                                }
                            }
                            var aridx = 0;
                            while (result[childName][aridx] !== null) {
                                aridx++;
                            }

                            (result[childName])[aridx] = parseDOMChildren(child);
                        }
                    }

                    // Attributes
                    for (var aidx = 0; aidx < node.attributes.length; aidx++) {
                        var attr = node.attributes.item(aidx); // [aidx];
                        result.__cnt++;
                        result["_" + attr.name] = attr.value;
                    }

                    // Node namespace prefix
                    var nodePrefix = getNodePrefix(node);
                    if (nodePrefix !== null && nodePrefix !== "") {
                        result.__cnt++;
                        result.__prefix = nodePrefix;
                    }

                    if (result.__cnt === 1 && result["#text"] !== null) {
                        result = result["#text"];
                    }

                    if (result["#text"] !== null) {
                        result.__text = result["#text"];
                        if (escapeMode) {
                            result.__text = unescapeXmlChars(result.__text);
                        }

                        delete result["#text"];
                        delete result["#text_asArray"];
                    }
                    if (result["#cdata-section"] != null) {
                        result.__cdata = result["#cdata-section"];
                        delete result["#cdata-section"];
                        delete result["#cdata-section_asArray"];
                    }

                    if (result.__text != null || result.__cdata != null) {
                        result.toString = function () {
                            return (this.__text != null ? this.__text : '') + (this.__cdata != null ? this.__cdata : '');
                        };
                    }
                    return result;
                }
                else {
                    if (node.nodeType === DOMNodeTypes.TEXT_NODE || node.nodeType === DOMNodeTypes.CDATA_SECTION_NODE) {
                        return node.nodeValue;
                    }
                }
            }
        }

        function startTag(jsonObj, element, attrList, closed) {
            var resultStr = "<" + ((jsonObj != null && jsonObj.__prefix != null) ? (jsonObj.__prefix + ":") : "") + element;
            if (attrList != null) {
                for (var aidx = 0; aidx < attrList.length; aidx++) {
                    var attrName = attrList[aidx];
                    var attrVal = jsonObj[attrName];
                    resultStr += " " + attrName.substr(1) + "='" + attrVal + "'";
                }
            }
            if (!closed) {
                resultStr += ">";
            } else {
                resultStr += "/>";
            }

            return resultStr;
        }

        function endTag(jsonObj, elementName) {
            return "</" + (jsonObj.__prefix !== null ? (jsonObj.__prefix + ":") : "") + elementName + ">";
        }

        function endsWith(str, suffix) {
            return str.indexOf(suffix, str.length - suffix.length) !== -1;
        }

        function jsonXmlSpecialElem(jsonObj, jsonObjField) {
            if (endsWith(jsonObjField.toString(), ("_asArray")) || jsonObjField.toString().indexOf("_") === 0 || (jsonObj[jsonObjField] instanceof Function)) {
                return true;
            } else {
                return false;
            }
        }

        function jsonXmlElemCount(jsonObj) {
            var elementsCnt = 0;
            if (jsonObj instanceof Object) {
                for (var it in jsonObj) {
                    if (jsonXmlSpecialElem(jsonObj, it)) {
                        continue;
                    }
                    elementsCnt++;
                }
            }
            return elementsCnt;
        }

        function parseJSONAttributes(jsonObj) {
            var attrList = [];
            if (jsonObj instanceof Object) {
                for (var ait in jsonObj) {
                    if (ait.toString().indexOf("__") === -1 && ait.toString().indexOf("_") === 0) {
                        attrList.push(ait);
                    }
                }
            }

            return attrList;
        }

        function parseJSONTextAttrs(jsonTxtObj) {
            var result = "";

            if (jsonTxtObj.__cdata != null) {
                result += "<![CDATA[" + jsonTxtObj.__cdata + "]]>";
            }

            if (jsonTxtObj.__text != null) {
                if (escapeMode) {
                    result += escapeXmlChars(jsonTxtObj.__text);
                } else {
                    result += jsonTxtObj.__text;
                }
            }
            return result;
        }

        function parseJSONTextObject(jsonTxtObj) {
            var result = "";

            if (jsonTxtObj instanceof Object) {
                result += parseJSONTextAttrs(jsonTxtObj);
            }
            else {
                if (jsonTxtObj != null) {
                    if (escapeMode) {
                        result += escapeXmlChars(jsonTxtObj);
                    } else {
                        result += jsonTxtObj;
                    }
                }
            }


            return result;
        }

        function parseJSONArray(jsonArrRoot, jsonArrObj, attrList) {
            var result = "";
            if (jsonArrRoot.length === 0) {
                result += startTag(jsonArrRoot, jsonArrObj, attrList, true);
            }
            else {
                for (var arIdx = 0; arIdx < jsonArrRoot.length; arIdx++) {
                    result += startTag(jsonArrRoot[arIdx], jsonArrObj, parseJSONAttributes(jsonArrRoot[arIdx]), false);
                    result += parseJSONObject(jsonArrRoot[arIdx]);
                    result += endTag(jsonArrRoot[arIdx], jsonArrObj);
                }
            }
            return result;
        }

        function parseJSONObject(jsonObj) {
            var result = "";

            var elementsCnt = jsonXmlElemCount(jsonObj);

            if (elementsCnt > 0) {
                for (var it in jsonObj) {
                    if (jsonXmlSpecialElem(jsonObj, it)) {
                        continue;
                    }

                    var subObj = jsonObj[it];
                    var attrList = parseJSONAttributes(subObj);

                    if (subObj === null || subObj === undefined) {
                        result += startTag(subObj, it, attrList, true);
                    } else {
                        if (subObj instanceof Object) {

                            if (subObj instanceof Array) {
                                result += parseJSONArray(subObj, it, attrList);
                            } else {
                                var subObjElementsCnt = jsonXmlElemCount(subObj);
                                if (subObjElementsCnt > 0 || subObj.__text !== null || subObj.__cdata !== null) {
                                    result += startTag(subObj, it, attrList, false);
                                    result += parseJSONObject(subObj);
                                    result += endTag(subObj, it);
                                } else {
                                    result += startTag(subObj, it, attrList, true);
                                }
                            }

                        } else {
                            result += startTag(subObj, it, attrList, false);
                            result += parseJSONTextObject(subObj);
                            result += endTag(subObj, it);
                        }
                    }
                }
            }
            result += parseJSONTextObject(jsonObj);

            return result;
        }

        this.parseXmlString = function (xmlDocStr) {
            var xmlDoc;
            if (window.DOMParser) {
                var parser = new window.DOMParser();
                xmlDoc = parser.parseFromString(xmlDocStr, "text/xml");
            }
            else {
                // IE :(
                if (xmlDocStr.indexOf("<?") === 0) {
                    xmlDocStr = xmlDocStr.substr(xmlDocStr.indexOf("?>") + 2);
                }
                xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                xmlDoc.async = "false";
                xmlDoc.loadXML(xmlDocStr);
            }
            return xmlDoc;
        };

        this.xml2json = function (xmlDoc) {
            return parseDOMChildren(xmlDoc);
        };

        this.xml_str2json = function (xmlDocStr) {
            var xmlDoc = this.parseXmlString(xmlDocStr);
            return this.xml2json(xmlDoc);
        };

        this.json2xml_str = function (jsonObj) {
            return parseJSONObject(jsonObj);
        };

        this.json2xml = function (jsonObj) {
            var xmlDocStr = this.json2xml_str(jsonObj);
            return this.parseXmlString(xmlDocStr);
        };

        this.getVersion = function () {
            return VERSION;
        };

        this.escapeMode = function (enabled) {
            escapeMode = enabled;
        };
    }

    var x2js = new X2JS();
    return {
        /** Called to load in the legacy tree js which is required on startup if a user is logged in or 
         after login, but cannot be called until they are authenticated which is why it needs to be lazy loaded. */
        toJson: function (xml) {
            var json = x2js.xml_str2json(xml);
            return json;
        },
        fromJson: function (json) {
            var xml = x2js.json2xml_str(json);
            return xml;
        }
    };
}
angular.module('umbraco.services').factory('xmlhelper', xmlhelper);