using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using Seagull.BarTender.Print;
using System.Data;
using System.Runtime.InteropServices;

namespace MES接口
{
    public partial class BarTender : Form
   {
      #region Fields
      // Common strings.
      //format.BaseName 获取当前文件名，不包括后缀
      //format.Title 获取全部文件名，包括后缀
      //format.Status 文件是否被加载
      [DllImport("user32.dll")]
      public static extern bool ReleaseCapture();
      [DllImport("user32.dll")]
      public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
      public const int WM_SYSCOMMAND = 0x0112;
      public const int SC_MOVE = 0xF010;
      public const int HTCAPTION = 0x0002;

      private const string appName = "Label Print";
      private const string dataSourced = "Data Sourced";
      private Engine engine = null; // 新建打印机引擎
      private LabelFormatDocument format = null; // 当前打开的BTW文件对象
      private bool isClosing = false; // 正在关闭时此选项设置为true，会阻止缩略图加载.

      // 标签预览
      private string[] browsingFormats; // 当前选取的文件夹下的Btw文件
      Hashtable listItems; // A hash table containing ListViewItems and indexed by format name.
                           // It keeps track of what formats have had their image loaded.
      Queue<int> generationQueue; // A queue containing indexes into browsingFormats
                                  // to facilitate the generation of thumbnails

      // 预览文件的索引
      int topIndex; // The top visible index in the lstLabelBrowser
      int selectedIndex; // 预览框选中文件的索引
      #endregion

      #region Enumerations
      // Indexes into our image list for the label browser.
      enum ImageIndex { LoadingFormatImage = 0, FailureToLoadFormatImage = 1 };
      #endregion

      #region Constructor
      /// <summary>
      /// 构造函数初始化
      /// </summary>
      public BarTender()
      {
         InitializeComponent();
      }
      #endregion

      #region Delegates
      delegate void DelegateShowMessageBox(string message);
      #endregion

      #region Event Handlers
      #region Form Event Handlers
      /// <summary>
      /// 页面启动的时候执行，和打印机进行连接
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      private void LabelPrint_Load(object sender, EventArgs e)
      {
         this.headBar1.MouseDown += new MouseEventHandler(this.headBar1_MouseDown);
            // 创建一个打印机进程
         try
         {
            engine = new Engine(true);
         }
         catch (PrintEngineException exception)
         {
            // 不能打印进程返回错误信息直接退出程序
            MessageBox.Show(this, exception.Message, appName);
            this.Close(); 
            return;
         }

         // 获取打印机列表
         Printers printers = new Printers();
         foreach (Printer printer in printers)
         {
            cboPrinters.Items.Add(printer.PrinterName);
         }

         if (printers.Count > 0)
         {
            // 设置下拉框选中默认打印机
            cboPrinters.SelectedItem = printers.Default.PrinterName;
         }

         // 设置预览框中的图标
         lstLabelBrowser.View = View.LargeIcon;
         lstLabelBrowser.LargeImageList = new ImageList();
         lstLabelBrowser.LargeImageList.ImageSize = new Size(100, 100);
         lstLabelBrowser.LargeImageList.Images.Add(Properties.Resources.LoadingFormat);
         lstLabelBrowser.LargeImageList.Images.Add(Properties.Resources.LoadingError);

         // 初始化一个队列
         listItems = new Hashtable();
         generationQueue = new Queue<int>();

         //设置打印份数的最大值
         txtIdenticalCopies.MaxLength = 9;
         txtSerializedCopies.MaxLength = 9;
      }

      /// <summary>
      /// 关闭窗口的时候执行该方法
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      private void LabelPrint_FormClosed(object sender, FormClosedEventArgs e)
      {
         isClosing = true;

         // 关闭窗口之前向后台请求取消尚未打印的内容 
         thumbnailCacheWorker.CancelAsync();
         while (thumbnailCacheWorker.IsBusy)
         {
            Application.DoEvents();
         };

         // 如果已经启动了打印机，停止打印机并且不保存修改的文件SubString
         if (engine != null)
            engine.Stop(SaveOptions.DoNotSaveChanges);
      }

      /// <summary>
      ///打开文件夹的时候，选择该文件夹下面后缀名为.BTW的文件进行显示
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      private void btnOpen_Click(object sender, EventArgs e)
      {
         //选择文件的时提示的描述
         folderBrowserDialog.Description = "选择一个包含打印文件(*.BTW)的文件夹";
         DialogResult result = folderBrowserDialog.ShowDialog();
         if (result == DialogResult.OK)
         {
            lock (generationQueue)
            {
               generationQueue.Clear();
            }
            //清空之前选择的内容
            listItems.Clear();
            //将文件夹的路径赋值给TextBox
            txtFolderPath.Text = folderBrowserDialog.SelectedPath;
            //为选取的时候打印按钮为Disabled
            btnPrint.Enabled = false;
            //读取该文件夹下面的BTW文件，browsingFormats是文件名的字符串数组
            browsingFormats = System.IO.Directory.GetFiles(txtFolderPath.Text, "*.btw");

            // ListView序列化的长度
            lstLabelBrowser.VirtualListSize = browsingFormats.Length;
         }
      }

      /// <summary>
      /// 点击打印按钮的时候执行
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      private void btnPrint_Click(object sender, EventArgs e)
      {
         // 正在打印的时候锁定该进程
         // 用户点击也不展示SubString
         lock (engine)
         {
            bool success = true;
            // 设置打印参数
            if (format.PrintSetup.SupportsIdenticalCopies)
            {   
               int copies = 1;
               success = Int32.TryParse(txtIdenticalCopies.Text, out copies) && (copies >= 1);
               if (!success)
                  MessageBox.Show(this, "打印的份数必须大于1的整数", appName);
               else
               {
                  format.PrintSetup.IdenticalCopiesOfLabel = copies;
               }
            }
            // 数据源是数据库的时候
            // Assign number of serialized copies if it is not datasourced.
            if (success && (format.PrintSetup.SupportsSerializedLabels))
            {
               int copies = 1;
               success = int.TryParse(txtSerializedCopies.Text, out copies) && (copies >= 1);
               if (!success)
               {
                  MessageBox.Show(this, "打印份数必须是大于1的数字", appName);
               }
               else
               {
                  format.PrintSetup.NumberOfSerializedLabels = copies;
               }
            }

            // 所有的验证条件通过执行打印
            if (success)
            {
               Cursor.Current = Cursors.WaitCursor;

               // 选择打印机的名称
               if (cboPrinters.SelectedItem != null)
                  format.PrintSetup.PrinterName = cboPrinters.SelectedItem.ToString();

                    //int waitForCompletionTimeout = 10000; // 10 seconds
                    //Result result = format.Print(appName, waitForCompletionTimeout, out messages);
                    //string messageString = "\n\nMessages:";

                    //foreach (Seagull.BarTender.Print.Message message in messages)
                    //{
                    //   messageString += "\n\n" + message.Text;
                    //}

                    //if (result == Result.Failure)
                    //   MessageBox.Show(this, "Print Failed" + messageString, appName);
                    //else
                    //   MessageBox.Show(this, "Label was successfully sent to printer." + messageString, appName);
                }
         }
      }
      #endregion

      #region List View Event Handlers
      /// <summary>
      /// 选中预览文件的时候读取SubString
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      private void lstLabelBrowser_SelectedIndexChanged(object sender, EventArgs e)
      {
         if (lstLabelBrowser.SelectedIndices.Count == 1)
         {
            selectedIndex = lstLabelBrowser.SelectedIndices[0];
            EnableControls(false);
            picUpdatingFormat.Visible = true;

            // 启动后台加载函数读取内容
            // 读取到的数据显示在DataGridView当中
            BackgroundWorker formatLoader = new BackgroundWorker();
            formatLoader.DoWork += new DoWorkEventHandler(formatLoader_DoWork);
            formatLoader.RunWorkerCompleted += new RunWorkerCompletedEventHandler(formatLoader_RunWorkerCompleted);
            formatLoader.RunWorkerAsync(selectedIndex);
         }
         else if (lstLabelBrowser.SelectedIndices.Count == 0)
         {
            EnableControls(false);
            picUpdatingFormat.Visible = false;
         }
      }
      /// <summary>
      /// 读取完文件夹的时候展示问价在该区域
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      private void lstLabelBrowser_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
      {
         int btwFileIndex = e.ItemIndex;

         //如果不存在这个项目则设置成默认的图片
         if (listItems[browsingFormats[btwFileIndex]] == null)
         {
            e.Item = new ListViewItem(browsingFormats[btwFileIndex]);
            e.Item.ImageIndex = (int)ImageIndex.LoadingFormatImage;
            listItems.Add(browsingFormats[btwFileIndex], e.Item);
         }
         else
         {
            e.Item = (ListViewItem)listItems[browsingFormats[btwFileIndex]];
         }

         // 将索引添加到队列.
         if (e.Item.ImageIndex == (int)ImageIndex.LoadingFormatImage)
         {
            lock (generationQueue)
            {
               if (!generationQueue.Contains(btwFileIndex))
                  generationQueue.Enqueue(btwFileIndex);
            }
         }

         // 将东西放进队列的时候，如果队列没有被占用则开始执行任务
         if (!thumbnailCacheWorker.IsBusy && (generationQueue.Count > 0))
         {
            thumbnailCacheWorker.RunWorkerAsync();
         }
      }

      /// <summary>
      /// 缓存读取的文件列表
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="cacheEvent"></param>
      private void lstLabelBrowser_CacheVirtualItems(object sender, CacheVirtualItemsEventArgs cacheEvent)
      {
         topIndex = cacheEvent.StartIndex;

         lock (generationQueue)
         {
            for (int index = cacheEvent.StartIndex; index <= cacheEvent.EndIndex; ++index)
            {
               ListViewItem listViewItem = (ListViewItem)listItems[browsingFormats[index]];

               if ((listViewItem != null) && (listViewItem.ImageIndex == (int)ImageIndex.LoadingFormatImage))
               {
                  if (!generationQueue.Contains(index))
                     generationQueue.Enqueue(index);
               }
            }
         }

         // 任务资源可用的时候执行
         if (!thumbnailCacheWorker.IsBusy && (generationQueue.Count > 0))
         {
            thumbnailCacheWorker.RunWorkerAsync();
         }
      }
      #endregion

      #region Thumbnail Event Handlers
      /// <summary>
      /// Called when a thumbnail was loaded so it can be shown.
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      void thumbnailCacheWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
      {
         object[] args = e.UserState as object[];
           
         ListViewItem item = (ListViewItem)args[0];

         // 100 means we got the image successfully.
         if (e.ProgressPercentage == 100)
         {
            Image thumbnail = (Image)args[1];
            lstLabelBrowser.LargeImageList.Images.Add(item.Text, thumbnail);
            item.ImageIndex = lstLabelBrowser.LargeImageList.Images.IndexOfKey(item.Text);
         }
         else if (e.ProgressPercentage == 0) // 0 means we did not successfully get the format image.
         {
            item.ImageIndex = (int)ImageIndex.FailureToLoadFormatImage;
         }
         item.ListView.Invalidate(item.Bounds);
      }

      /// <summary>
      /// 后台启用函数加载缩略图
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      void thumbnailCacheWorker_DoWork(object sender, DoWorkEventArgs e)
      {
         BackgroundWorker worker = (BackgroundWorker)sender;

         int index;
         string fileName;

         // Loop until the queue of items that need to be loaded is empty or the worker was cancelled.
         while ((generationQueue.Count > 0) && !worker.CancellationPending && !isClosing)
         {
            lock (generationQueue)
            {
               // Get the index to use.
               index = generationQueue.Dequeue();
            }
            
            // If this is way out of our view don't bother generating it.
            if (Math.Abs(index - topIndex) < 30)
            {
               fileName = browsingFormats[index];

               // 检查文件是否出缩略图外都已经加载完成了
               ListViewItem item = (ListViewItem)listItems[fileName];
               if (item == null)
               {
                  item = new ListViewItem(fileName);
                  item.ImageIndex = (int)ImageIndex.LoadingFormatImage;
                  listItems.Add(fileName, item);
               }

               // 没有缩略图的时候就给个默认的
               if (item.ImageIndex == (int)ImageIndex.LoadingFormatImage)
               {
                  try
                  {
                     Console.WriteLine(fileName);
                     Image btwImage = LabelFormatThumbnail.Create(fileName, Color.Gray, 100, 100);

                     object[] progressReport = new object[] { item, btwImage };
                     worker.ReportProgress(100, progressReport);
                  }
                  catch
                  {
                     object[] progressReport = new object[] { item, null };
                     worker.ReportProgress(0, progressReport);
                  }
               }
            }
         }
      }
      #endregion

      #region Format Loader Event Handlers
      /// <summary>
      ///在另一个进程中进行文件的读取，不用占用当前的界面
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      void formatLoader_DoWork(object sender, DoWorkEventArgs e)
      {
         int index = (int)e.Argument;
         string errorMessage = "";

         // 确保安全先锁定打印机，因为可能正在执行打印任务
         lock (engine)
         {
            //确保用户选中该列表
            if (selectedIndex == index)
            {
               try
               {
                  if (format != null)
                  //是否保存对文件的编辑
                  format.Close(SaveOptions.SaveChanges);
                  format = engine.Documents.Open(browsingFormats[index]);
               }
               catch (System.Runtime.InteropServices.COMException comException)
               {
                  errorMessage = String.Format("Unable to open format: {0}\nReason: {1}", browsingFormats[index], comException.Message);
                  format = null;
               }
            }
         }
         // 后台执行只能调用MessageBox来显示信息
         if (errorMessage.Length != 0)
            Invoke(new DelegateShowMessageBox(ShowMessageBox), errorMessage);
      }

      /// <summary>
      /// 文件加载完的时候执行
      /// 填充打印份数默认值为1，如果存在SubString则读取出来
      /// </summary>
      /// <param name="sender"></param>
      /// <param name="e"></param>
      void formatLoader_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
      {
         // 确保正在操作的时候不会丢失该文件
         lock (engine)
         {
            if (format != null)
            {
               EnableControls(true);
               cboPrinters.SelectedItem = format.PrintSetup.PrinterName;
               picUpdatingFormat.Visible = false;
               lblFormatError.Visible = false;

               //支持打印多份的时候
               if (format.PrintSetup.SupportsIdenticalCopies == false)
               {
                  txtIdenticalCopies.Text = dataSourced;
                  txtIdenticalCopies.ReadOnly = true;
               }
               else
               {
                  txtIdenticalCopies.Text = format.PrintSetup.IdenticalCopiesOfLabel.ToString();
                  txtIdenticalCopies.ReadOnly = false;
               }

               //数据源是数据库的时候 
               if (format.PrintSetup.SupportsSerializedLabels == false)
               {
                  txtSerializedCopies.Text = dataSourced;
                  txtSerializedCopies.ReadOnly = true;
               }
               else
               {
                  txtSerializedCopies.Text = format.PrintSetup.NumberOfSerializedLabels.ToString();
                  txtSerializedCopies.ReadOnly = false;
               }
                    //DataTable dt = new DataTable();
                    //DataRow row = dt.NewRow();
                    //dt.Columns.Add(new DataColumn("name"));
                    //dt.Columns.Add(new DataColumn("sex"));
                    //dt.Columns.Add(new DataColumn("age"));
                    //row["name"] = "John";
                    //row["sex"] = "Smith";
                    //row["age"] = "18";
                    //dt.Rows.Add(row);
                    //MessageBox.Show(format.SubStrings[0].Name);
                    //获取具名数据源
                    if (format.SubStrings.Count > 0){
                  BindingSource bindingSource = new BindingSource();
                  bindingSource.DataSource = format.SubStrings;
                  substringGrid.DataSource = bindingSource;
                  substringGrid.AutoResizeColumns();
                  lblNoSubstrings.Visible = false;
               }else{
                  lblNoSubstrings.Visible = true;
               }
               substringGrid.Invalidate();
            }
            else // 没有文件的时候，隐藏标签信息
            {
               picUpdatingFormat.Visible = false;
               lblNoSubstrings.Visible = false;
               lblFormatError.Visible = true;
            }
         }
      }
      #endregion
      #endregion

      #region Methods
      /// <summary>
      ///打开的文件无效禁用所有的控件
      /// </summary>
      /// <param name="enable"></param>
      void EnableControls(bool enable)
      {
         txtIdenticalCopies.Enabled = enable;
         txtSerializedCopies.Enabled = enable;
         btnPrint.Enabled = enable;

         if (!enable)
         {
            txtIdenticalCopies.Text = "";
            txtSerializedCopies.Text = "";
            substringGrid.DataSource = null;
            lblFormatError.Visible = false;
            lblNoSubstrings.Visible = false;
         }
      }

      /// <summary>
      /// 重写一个展示消息的方法
      /// </summary>
      /// <param name="message">展示的信息</param>
        void ShowMessageBox(string message)
        {
            MessageBox.Show(this, message, appName);
        }

        #endregion

        private void headBar1_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }
    }
}