using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.Xml.XPath;
using System.IO;

namespace WindowsFormsApp1
{
    public partial class StartShell : Form
    {
        XmlDocument xpathTo = null;

        public const string SearchFilter =
            "xml files (*.xml)|*.xml|config files (*.config, xml)|*.config|All files (*.*)|*.*";
        private string[] Levels = new string[100];
        public StartShell()
        {
            InitializeComponent();
        }

        private void BtnFromXml_Click(object sender, EventArgs e)
        {
            openFileDialog1.Title = "Fetch XML-file keeping new values";
            openFileDialog1.Filter = SearchFilter;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                lblFromXml.Text = openFileDialog1.FileName;
            }
        }

        private void BtnToXml_Click(object sender, EventArgs e)
        {
            openFileDialog1.Title = "Fetch XML-file to be updated";
            openFileDialog1.Filter = SearchFilter;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                lblToXml.Text = openFileDialog1.FileName;
            }
        }

        private void BtnStart_Click(object sender, EventArgs e)
        {
            // XML-document analysed

            XmlDocument xnode = new XmlDocument();
            xnode.Load(lblFromXml.Text);
          

            if (lblToXml.Text != "toxmlpath")
            {
                // XML-document for receiving file
                
                xpathTo = new XmlDocument();
                xpathTo.Load(lblToXml.Text);
            }


            lvwResult.Items.Clear();
            Process(xnode);

            // Saves to temporary file
            xpathTo.Save("abc.xml");

            // Move temporary file to original directory

            FileInfo fi = new FileInfo(lblToXml.Text);
            var actDir = fi.DirectoryName;
            var createdFile = File.ReadAllBytes("abc.xml");
            var fName = actDir + "\\default_" + DateTime.Now.ToShortDateString()+"__" + DateTime.Now.ToLongTimeString().Replace(":","-") + ".config";
            File.WriteAllBytes(fName,createdFile);
            File.Delete("abc.xml");
        }

        void Process(XmlNode node)
        {
            // Processing is a recurring process
            Process(node, 0);
        }

        void Process(XmlNode node, int level)
        {

            if (node.NodeType == XmlNodeType.Text)
            {
                ListViewItem lviResult = new ListViewItem();
                lviResult.Text = node.ParentNode.LocalName;
                lviResult.SubItems.Add(node.Value);

                // Find XPath for current node
                var xPath = GetXPathToNode(node);

                // Routine for XPath creates bad end on text-nodes / chenges to something seems working
                if (xPath.Trim().Substring(xPath.Trim().Length - 9) == "/#text[1]")
                {
                    xPath = xPath.Substring(0, xPath.Trim().Length - 9);
                    xPath = xPath + "/text()";
                }

                // Put data into ListView

                lviResult.SubItems.Add(xPath);
                if (lblToXml.Text != "toxmlpath")
                {
                    XmlNode searchedField = xpathTo.SelectSingleNode(xPath);
                    if (searchedField != null)
                    {
                        lviResult.SubItems.Add(searchedField.InnerText);
                        searchedField.Value = node.Value;
                    }
                    else
                    {
                        searchedField = xpathTo.SelectSingleNode(xPath.Substring(0, xPath.Trim().Length-7));
                        if (searchedField.OuterXml != "")
                        {
                            lviResult.SubItems.Add(searchedField.OuterXml);
                            XmlElement elemSearchfield = (XmlElement) searchedField;
                            if (elemSearchfield.IsEmpty)
                            {
                                elemSearchfield.InnerXml = node.Value;
                            }
                        }
                        else lviResult.SubItems.Add("saknas!");
                    }
                }



                lvwResult.Items.Add(lviResult);
            }

            foreach (XmlNode child in node.ChildNodes)
            {
                Process(child, level + 1);
            }
        }

        /// <summary>
        /// Gets the X-Path to a given Node
        /// </summary>
        /// <param name="node">The Node to get the X-Path from</param>
        /// <returns>The X-Path of the Node</returns>
        public string GetXPathToNode(XmlNode node)
        {
            if (node.NodeType == XmlNodeType.Attribute)
            {
                // attributes have an OwnerElement, not a ParentNode; also they have             
                // to be matched by name, not found by position             
                return String.Format("{0}/@{1}", GetXPathToNode(((XmlAttribute)node).OwnerElement), node.Name);
            }
            if (node.ParentNode == null)
            {
                // the only node with no parent is the root node, which has no path
                return "";
            }

            // Get the Index
            int indexInParent = 1;
            XmlNode siblingNode = node.PreviousSibling;
            // Loop thru all Siblings
            while (siblingNode != null)
            {
                // Increase the Index if the Sibling has the same Name
                if (siblingNode.Name == node.Name)
                {
                    indexInParent++;
                }
                siblingNode = siblingNode.PreviousSibling;
            }

            // the path to a node is the path to its parent, plus "/node()[n]", where n is its position among its siblings.         
            return String.Format("{0}/{1}[{2}]", GetXPathToNode(node.ParentNode), node.Name, indexInParent);
        }

 
        private void LvwResult_Click(object sender, EventArgs e)
        {
            var firstSelectedItem = lvwResult.SelectedItems[0];
            var xpath = firstSelectedItem.SubItems[2].Text;
            if (xpath.Trim().Substring(xpath.Trim().Length - 9) == "/#text[1]")
            {
                txtXPathAnalyse.Text = xpath.Substring(0, xpath.Trim().Length - 9);
            }
            else
            {
                txtXPathAnalyse.Text = xpath;
            }
        }
    }

}