using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;

namespace XMLtoJSON_utility
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           
        }
 
        public string DefaultFileName = "Upload/";
        protected void UploadButton_Click(object sender, EventArgs e)
        {
            txtJson.Text = "";
            txtXml.Text = "";
            Label1.Text="";
            XmlDocument doc = new XmlDocument();

            if (FileUploader.HasFile)
                try
                {
                    FileUploader.SaveAs(Server.MapPath(DefaultFileName) +
                         FileUploader.FileName);
                    string path = Server.MapPath("~/Upload/" + FileUploader.PostedFile.FileName);
                    doc.Load(path);
                    txtXml.Text = doc.InnerXml;
                    string JSON = XmlToJSON(doc);
                    txtJson.Text = JSON;
                }
                catch (Exception ex)
                {
                    Label1.Text = "ERROR: " + ex.Message.ToString();
                }
            else
            {
                Label1.Text = "You have not specified a file.";
            }

        }
            
        private static string XmlToJSON(XmlDocument xmlDoc)
        {
            StringBuilder sbJSON = new StringBuilder();
            sbJSON.Append("{ ");
            XmlToJSONnode(sbJSON, xmlDoc.DocumentElement, true);
            sbJSON.Append("}");
            return sbJSON.ToString();
        }
        
        private static void XmlToJSONnode(StringBuilder sbJSON, XmlElement node, bool showNodeName)
        {
            if (showNodeName)
                sbJSON.Append("\"" + SafeJSON(node.Name) + "\": ");
            sbJSON.Append("{");
           
            Dictionary<string, ArrayList> childNodeNames = new Dictionary<string, ArrayList>();
            string attrName;

            //  Add in all nodes
            foreach (XmlNode cnode in node.ChildNodes)
            {
                if (cnode is XmlText)
                    StoreChildNode(childNodeNames, "value", cnode.InnerText);
                else if (cnode is XmlElement)
                    StoreChildNode(childNodeNames, cnode.Name, cnode);
            }
            //  Add in all node attributes
            if (node.Attributes != null)
                foreach (XmlAttribute attr in node.Attributes)
                {
                    attrName = "_" + attr.Name;
                    StoreChildNode(childNodeNames, attrName, attr.InnerText);
                }
            // Now output all stored info
            foreach (string childname in childNodeNames.Keys)
            {
                ArrayList alChild = (ArrayList)childNodeNames[childname];
                if (alChild.Count == 1)
                    OutputNode(childname, alChild[0], sbJSON, true);
                else
                {
                    sbJSON.Append(" \"" + SafeJSON(childname) + "\": [ ");
                    foreach (object Child in alChild)
                        OutputNode(childname, Child, sbJSON, false);
                    sbJSON.Remove(sbJSON.Length - 2, 2);
                    sbJSON.Append(" ], ");
                }
            }
            sbJSON.Remove(sbJSON.Length - 2, 2);
            sbJSON.Append(" }");
        }
        //  StoreChildNode: Store data associated with each nodeName
        //                  so that we know whether the nodeName is an array or not.
        private static void StoreChildNode(Dictionary<string, ArrayList> childNodeNames, string nodeName, object nodeValue)
        {
            if (nodeValue is XmlElement)
            {
                XmlNode cnode = (XmlNode)nodeValue;
                if (cnode.Attributes.Count == 0)
                {
                    XmlNodeList children = cnode.ChildNodes;
                    if (children.Count == 0)
                        nodeValue = null;
                    else if (children.Count == 1 && (children[0] is XmlText))
                        nodeValue = ((XmlText)(children[0])).InnerText;
                }
            }
         
           // object oValuesAL = childNodeNames[nodeName];
            ArrayList ValuesAL;
            if (!childNodeNames.ContainsKey(nodeName))
            {
                ValuesAL = new ArrayList();
                childNodeNames[nodeName] = ValuesAL;
            }
            else
                ValuesAL = childNodeNames[nodeName];
            ValuesAL.Add(nodeValue);
        }

        private static void OutputNode(string childname, object alChild, StringBuilder sbJSON, bool showNodeName)
        {
            if (alChild == null)
            {
                if (showNodeName)
                    sbJSON.Append("\"" + SafeJSON(childname) + "\": ");
                sbJSON.Append("null");
            }
            else if (alChild is string)
            {
                if (showNodeName)
                    sbJSON.Append("\"" + SafeJSON(childname) + "\": ");
                string sChild = (string)alChild;
                sChild = sChild.Trim();
                sbJSON.Append("\"" + SafeJSON(sChild) + "\"");
            }
            else
                XmlToJSONnode(sbJSON, (XmlElement)alChild, showNodeName);
            sbJSON.Append(", ");
        }

        // Make a string safe for JSON
        private static string SafeJSON(string sIn)
        {
            StringBuilder sbOut = new StringBuilder(sIn.Length);
            foreach (char ch in sIn)
            {
                if (Char.IsControl(ch) || ch == '\'')
                {
                    int ich = (int)ch;
                    sbOut.Append(@"\u" + ich.ToString("x4"));
                    continue;
                }
                else if (ch == '\"' || ch == '\\' || ch == '/')
                {
                    sbOut.Append('\\');
                }
                sbOut.Append(ch);
            }
            return sbOut.ToString();
        }
    }
}