using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml;

namespace FileTree
{
   public partial class TreeForm : Form
   {
      MySorter sorter = new MySorter ();

      Bitmap picture = null;

      public TreeForm ()
      {
         InitializeComponent ();
         listView.ListViewItemSorter = sorter;
         runButton_Click(null, null);

         /* 
         string [] pole = { "a", "bb", "CCC" };
         dataBox.ColumnCount = pole.Length;
         dataBox.Rows.Add(pole);
         dataBox.Rows.Add(pole);
         */
         
      }

      private void listView_ColumnClick(object sender, ColumnClickEventArgs e)
      {
          if (sorter.column_index == e.Column)
          {
              sorter.inv = ! sorter.inv;
          }
          else
          {
              sorter.column_index = e.Column;
              sorter.inv = false;
          }

          listView.Sort ();
      }

      private void runButton_Click(object sender, EventArgs e)
      {
         DriveInfo [] drives = DriveInfo.GetDrives ();
         foreach ( DriveInfo d in drives )
         {
            MyTreeNode n = new MyTreeNode ();
            n.Text = d.Name;
            n.Path = d.Name;
            try
            {
               // n.ToolTipText = d.VolumeLabel;
            }
            catch ( Exception ex )
            {
               n.ToolTipText = ex.Message;
            }
            treeView.Nodes.Add (n);

            // addSubdirs (n, 2);
         }
      }

      private void addSubdirs (MyTreeNode top, int level)
      {
         if (top.ready)
         {
            if (level > 1)
               foreach (MyTreeNode n in top.Nodes)
                  addSubdirs (n, level-1);
         }
         else
         {
            top.ready = true;
            try
            {
               DirectoryInfo top_dir = new DirectoryInfo (top.Path);
               DirectoryInfo [] subdirs = top_dir.GetDirectories ();
               foreach (DirectoryInfo d in subdirs)
               {
                  MyTreeNode n = new MyTreeNode ();
                  n.Text = d.Name;
                  n.ToolTipText = d.FullName;
                  n.Path = d.FullName;
                  top.Nodes.Add (n);
                  showStatus (n.Path);

                  if ( level > 1 )
                     addSubdirs (n, level-1);
               }
            }
            catch (Exception ex)
            {
               // top.ToolTipText = ex.Message;
               showStatus (ex.Message);
            }
         }
      }

      private void showFiles (MyTreeNode top)
      {
         listView.Items.Clear ();
         try
         {
            DirectoryInfo top_dir = new DirectoryInfo (top.Path);
            FileInfo [] files = top_dir.GetFiles ();
            foreach (FileInfo f in files)
            {
               MyListNode n = new MyListNode ();
               n.FilePath = f.FullName;
               n.FileName = f.Name;
               n.FileSize = f.Length;
               n.FileTime = f.LastWriteTime;
                
               n.Text = n.FileName;
               n.ToolTipText = n.FilePath;

               n.SubItems.Add("" + n.FileSize);

               n.SubItems.Add(n.FileTime.ToString ("dd-MM-yyyy hh:mm:ss"));

               listView.Items.Add (n);

               
            }
         }
         catch ( Exception ex )
         {
            // top.ToolTipText = ex.Message;
            showStatus (ex.Message);
         }
      }

      private void showFile (MyListNode n)
      {

          if (n != null)
          {
              string ext = Path.GetExtension (n.FileName);
              ext = ext.ToLower();
              switch (ext)
              {
                  case ".txt":
                  case ".bat":
                  case ".pas":
                  case ".c":
                  case ".cpp":
                      richTextBox.LoadFile(n.FilePath, RichTextBoxStreamType.PlainText);
                      tabControl.SelectedTab = textTab;
                      break;

                  case ".rtf":
                      richTextBox.LoadFile(n.FilePath);
                      tabControl.SelectedTab = textTab;
                      break;

                  case ".bmp":
                  case ".jpg":
                  case ".jpeg":
                      picture = new Bitmap(n.FilePath);
                      pictureBox_SizeChanged(null, null);
                      tabControl.SelectedTab = pictureTab;
                      break;

                  case ".htm":
                  case ".html":
                      htmlBox.Url = new Uri ("file://" + n.FilePath);
                      tabControl.SelectedTab = htmlTab;
                      break;

                  case ".csv":
                      readDataFile(n.FilePath);
                      tabControl.SelectedTab = dataTab;
                      break;

                  case ".xml":
                      readXmlFile(n.FilePath);
                      tabControl.SelectedTab = xmlTab;
                      break;
              }
          }
      }

      private void readXmlFile (string filePath)
      {
          TreeNode current = null;

          // using System.Xml;
          XmlTextReader f = new XmlTextReader(filePath);
          while (f.Read())
          {
              if (f.NodeType == XmlNodeType.Element)
              {
                  TreeNode n = new TreeNode();
                  n.Text = f.Name;
                  if (current == null)
                      xmlBox.Nodes.Add (n);
                  else
                      current.Nodes.Add (n);
                  current = n;

                  if (f.HasAttributes)
                  {
                      f.MoveToFirstAttribute();
                      for (int i = 0; i < f.AttributeCount; i++)
                      {

                          TreeNode a = new TreeNode();
                          a.Text = "Attribute: " + f.Name + "=" + f.Value;
                          current.Nodes.Add(a);
                          f.MoveToNextAttribute();
                      }
                      f.MoveToElement();
                  }
                  if (f.IsEmptyElement)
                      current = current.Parent;
              }
              else if (f.NodeType == XmlNodeType.EndElement)
              {
                  current = current.Parent;
              }
              else if (f.NodeType == XmlNodeType.Text)
              {
                  TreeNode n = new TreeNode();
                  n.Text = f.Value;
                  current.Nodes.Add(n);
              }
          }
      }

      private void readDataFile (string filePath)
      {
          dataBox.Rows.Clear();
          dataBox.ColumnCount = 0;

          StreamReader r = new StreamReader(filePath);
          
          string s = r.ReadLine ();
          while (s != null)
          {
              string[] pole = s.Split(',');

              int k = pole.Length;
              if (dataBox.ColumnCount < k)
                  dataBox.ColumnCount = k;
              dataBox.Rows.Add(pole);

              s = r.ReadLine();
          }
          
          /*
          StringBuilder txt = new StringBuilder ("");
          List<string> list = new List<string> ();
          int n = r.Read ();
          while (n >= 0)
          {
              char c = (char) n;
              if (c >= ' ' && c != ',' && c != ';' )
                  txt.Append (c);
              else if (c == ',' || c == ';')
              {
                  list.Add (txt.ToString ());
                  txt = new StringBuilder ("");
              }
              else if (c == '\n')
              {
                  int k = list.Count;
                  if (dataBox.ColumnCount < k)
                      dataBox.ColumnCount = k;
                  dataBox.Rows.Add(list.ToArray ());
                  txt = new StringBuilder ("");
                  list.Clear ();
              }
              n = r.Read();
          }
           */
      }

      private void showStatus(string s)
      {
         statusField.Text = s;
      }

      private void treeView_BeforeSelect (object sender, TreeViewCancelEventArgs e)
      {
         MyTreeNode n = e.Node as MyTreeNode;
         addSubdirs (n, 2);
         showStatus ("Before select " + n.Path);
      }

      private void treeView_BeforeExpand (object sender, TreeViewCancelEventArgs e)
      {
         MyTreeNode n = e.Node as MyTreeNode;
         addSubdirs (n, 2);
         showStatus ("Before expand " + n.Path);
      }

      private void treeView_AfterSelect (object sender, TreeViewEventArgs e)
      {
         MyTreeNode n = e.Node as MyTreeNode;
         showFiles (n);
         showStatus ("Selected " + n.Path);
      }

      private void listView_DoubleClick(object sender, EventArgs e)
      {
          MyListNode n = null;
          if (listView.SelectedItems.Count != 0)
             n = listView.SelectedItems [0] as MyListNode;
          
          showFile (n);

      }

      private void pictureBox_SizeChanged(object sender, EventArgs e)
      {
          if (picture != null)
          {
              int w = pictureBox.Width;
              int h = pictureBox.Height;
              int w0 = picture.Width;
              int h0 = picture.Height;
              int h1 = (int) ( (float) w * h0 / w0 );
              if (h > h1)
                  h = h1;
              else
                  w = (int)((float)h * w0 / h0);
              pictureBox.Image = new Bitmap(picture, w, h);
          }
      }


   }
}