using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;

public sealed class Form1
{
  /// <summary>
  /// Handles the <see cref="FileSplitter"/> instance.
  /// </summary>
  private FileSplitter withEventsField_splitter = new FileSplitter { BufferSize = .BufferSize };

  private FileSplitter splitter {
    get { return withEventsField_splitter; }
    set {
      if (withEventsField_splitter != null) {
        withEventsField_splitter.SplitProgressChanged -= Splitter_SplitProgressChangedArgs;
        withEventsField_splitter.MergeProgressChanged -= Splitter_MergeProgressChangedArgs;
      }
      withEventsField_splitter = value;
      if (withEventsField_splitter != null) {
        withEventsField_splitter.SplitProgressChanged += Splitter_SplitProgressChangedArgs;
        withEventsField_splitter.MergeProgressChanged += Splitter_MergeProgressChangedArgs;
      }
    }
  }

  // Splitter settings.
  private readonly string workingDir = "C:\\Test";
  private readonly string fileName = "File.mp3";
  private readonly string filePath = IO.Path.Combine(workingDir, fileName);
  private readonly string chunkName = "File.Part";
  private readonly string chunkExt = "fs";

  // Merger settings.
  private readonly string firstChunkPath = string.Format("{0}\\{1}.01.{2}", workingDir, chunkName, chunkExt);
  private readonly string targetFileName = string.Format("{0}\\{1}.{2}", workingDir, "Merged", IO.Path.GetExtension(fileName));

  // Some default chunk sizes to split a file.
  private readonly int kilobyte = 1024;
  private readonly int megabyte = 1048576;
  private readonly int gigabyte = 1073741824;
  private readonly int halfFileSize = Convert.ToInt32(new IO.FileInfo(filePath).Length / 2);

  // The label controls that will display the progress.
  private Label labelSplit1 = new Label();
  private Label labelSplit2 = new Label();
  private Label labelSplit3 = new Label();
  private Label labelMerge1 = new Label();
  private Label labelMerge2 = new Label();
  private Label labelMerge3 = new Label();

  // The button controls to start a split or merge operation.
  private Button withEventsField_buttonSplit;
  private Button buttonSplit {
    get { return withEventsField_buttonSplit; }
    set {
      if (withEventsField_buttonSplit != null) {
        withEventsField_buttonSplit.Click -= ButtonSplit_Click;
      }
      withEventsField_buttonSplit = value;
      if (withEventsField_buttonSplit != null) {
        withEventsField_buttonSplit.Click += ButtonSplit_Click;
      }
    }
  }

  private Button withEventsField_buttonMerge = new Button();
  private Button buttonMerge {
    get { return withEventsField_buttonMerge; }
    set {
      if (withEventsField_buttonMerge != null) {
        withEventsField_buttonMerge.Click -= ButtonMerge_Click;
      }
      withEventsField_buttonMerge = value;
      if (withEventsField_buttonMerge != null) {
        withEventsField_buttonMerge.Click += ButtonMerge_Click;
      }
    }
  }

  /// <summary>
  /// Initializes a new instance of the <see cref="Form1"/> class.
  /// </summary>
  public Form1()
  {
    // This call is required by the designer.
    this.InitializeComponent();

    // Set the controls properties.
    buttonSplit.Text = "Split";
    buttonSplit.Font = new Font(this.Font.FontFamily, 14f, FontStyle.Bold);
    buttonSplit.Size = new Size(200, 75);
    buttonSplit.Location = new Point(0, 0);
    buttonSplit.Cursor = Cursors.Hand;

    buttonMerge.Text = "Merge";
    buttonMerge.Font = new Font(this.Font.FontFamily, 14f, FontStyle.Bold);
    buttonMerge.Size = new Size(200, 75);
    buttonMerge.Location = new Point(buttonSplit.Location.X + buttonSplit.Width, 0);
    buttonMerge.Cursor = Cursors.Hand;

    labelSplit1.Text = "Total Progress:";
    labelSplit1.AutoSize = true;
    labelSplit1.Font = new Font(this.Font.FontFamily, 9f, FontStyle.Regular);
    labelSplit1.Location = new Point(0, buttonSplit.Location.Y + buttonSplit.Height + 10);

    labelSplit2.Text = "Chunk Progress:";
    labelSplit2.AutoSize = true;
    labelSplit2.Font = new Font(this.Font.FontFamily, 9f, FontStyle.Regular);
    labelSplit2.Location = new Point(0, labelSplit1.Location.Y + labelSplit1.Height);

    labelSplit3.Text = "Chunk Count:";
    labelSplit3.AutoSize = true;
    labelSplit3.Font = new Font(this.Font.FontFamily, 9f, FontStyle.Regular);
    labelSplit3.Location = new Point(0, labelSplit2.Location.Y + labelSplit2.Height);

    labelMerge1.Text = "Total Progress:";
    labelMerge1.AutoSize = true;
    labelMerge1.Font = new Font(this.Font.FontFamily, 9f, FontStyle.Regular);
    labelMerge1.Location = new Point(buttonMerge.Location.X, buttonMerge.Location.Y + buttonMerge.Height + 10);

    labelMerge2.Text = "Chunk Progress:";
    labelMerge2.AutoSize = true;
    labelMerge2.Font = new Font(this.Font.FontFamily, 9f, FontStyle.Regular);
    labelMerge2.Location = new Point(buttonMerge.Location.X, labelMerge1.Location.Y + labelMerge1.Height);

    labelMerge3.Text = "Chunk Count:";
    labelMerge3.AutoSize = true;
    labelMerge3.Font = new Font(this.Font.FontFamily, 9f, FontStyle.Regular);
    labelMerge3.Location = new Point(buttonMerge.Location.X, labelMerge2.Location.Y + labelMerge2.Height);

    // Add the controls on the UI.
    this.Controls.AddRange({
      labelSplit1, labelSplit2, labelSplit3,
      labelMerge1, labelMerge2, labelMerge3,
      buttonSplit, buttonMerge
    })

    // Set the Form properties.
    this.Size = new Size(buttonSplit.Width + buttonMerge.Width + 20, 200);
    this.FormBorderStyle = Windows.Forms.FormBorderStyle.FixedDialog;
    this.MaximizeBox = false;
  }

  /// <summary>
  /// Handles the <see cref="Button.Click"/> event of the <see cref="ButtonSplit"/> control.
  /// </summary>
  private void ButtonSplit_Click()
  {
    this.splitter.Split(sourceFile: this.filePath,
                        chunkSize: this.halfFileSize,
                        chunkName: this.chunkName,
                        chunkExt: this.chunkExt,
                        overwrite: true,
                        deleteAfterSplit: false);

    // Or...
    //Me.splitter.Split(sourceFile:=Me.filePath,
    //                  chunkCount:=2,
    //                  chunkName:=Me.chunkName,
    //                  chunkExt:=Me.chunkExt,
    //                  overwrite:=True,
    //                  deleteAfterSplit:=False)
  }

  /// <summary>
  /// Handles the <see cref="Button.Click"/> event of the <see cref="ButtonMerge"/> control.
  /// </summary>
  private void ButtonMerge_Click()
  {
    this.splitter.Merge(sourceChunk: this.firstChunkPath,
                        targetFile: this.targetFileName,
                        overwrite: true,
                        deleteChunksAfterMerged: false);
  }

  /// <summary>
  /// Handles the <see cref="FileSplitter.SplitProgressChangedArgs"/> event of the <see cref="Splitter"/> instance.
  /// </summary>
  /// <param name="sender">The source of the event.</param>
  /// <param name="e">The <see cref="FileSplitter.SplitProgressChangedArgs"/> instance containing the event data.</param>
  private void Splitter_SplitProgressChangedArgs(object sender, FileSplitter.SplitProgressChangedArgs e)
  {
    labelSplit1.Text = string.Format("Total Progress: {0}%", e.TotalProgress.ToString("n1"));
    labelSplit2.Text = string.Format("Chunk Progress: {0}%", e.ChunkProgress.ToString("n1"));
    labelSplit3.Text = string.Format("Current  Chunk: {0} of {1}", Convert.ToString(e.ChunksCreated + 1), Convert.ToString(e.ChunksToCreate));
    Application.DoEvents();
  }

  /// <summary>
  /// Handles the <see cref="FileSplitter.MergeProgressChangedArgs"/> event of the <see cref="Splitter"/> instance.
  /// </summary>
  /// <param name="sender">The source of the event.</param>
  /// <param name="e">The <see cref="FileSplitter.MergeProgressChangedArgs"/> instance containing the event data.</param>
  private void Splitter_MergeProgressChangedArgs(object sender, FileSplitter.MergeProgressChangedArgs e)
  {
    labelMerge1.Text = string.Format("Total Progress: {0}%", e.TotalProgress.ToString("n1"));
    labelMerge2.Text = string.Format("Chunk Progress: {0}%", e.ChunkProgress.ToString("n1"));
    labelMerge3.Text = string.Format("Current  Chunk: {0} of {1}", Convert.ToString(e.ChunksMerged + 1), Convert.ToString(e.ChunksToMerge));
    Application.DoEvents();
  }

}

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