Imports System.ComponentModel
Imports System.Drawing
Imports System.IO
Imports System.Windows.Forms
Imports DevExpress.Utils
Imports DevExpress.XtraEditors
Imports DevExpress.XtraGrid
Imports DevExpress.XtraGrid.Columns
Imports DevExpress.XtraGrid.Views.BandedGrid
Imports DevExpress.XtraGrid.Views.Base
Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Grid.ViewInfo
Imports DevExpress.XtraPrinting
Imports DigitalData.Modules.Config
Imports DigitalData.Modules.EDMI.API
Imports DigitalData.Modules.EDMI.API.Client
Imports DigitalData.Modules.Language
Imports DigitalData.Modules.Logging
Imports DigitalData.Modules.ZooFlow

Public Class frmDocumentResultList
    Implements IResultForm

    ' These are NOT constants, only defaults
    ' Can be changed when calling frmDocumentResultList
    Private COLUMN_FILEPATH As String = "FULL_FILENAME"
    Private COLUMN_FILENAME As String = "Filename"
    Private COLUMN_DOCID As String = "DocID"
    Private COLUMN_ICON As String = "ICON"

    Private Const FILE_OPEN_TIMER_INTERVAL As Integer = 500

    ' Helper Classes
    Private _IDBClient As Client
    Private _LogConfig As LogConfig
    Private _Logger As Logger
    Private _Config As ConfigManager(Of DocumentResultConfig)
    Private _Environment As Environment
    Private _Params As DocumentResultParams
    Private _ResultLists As List(Of DocumentResult)
    Private _Helpers As DocumentResultList
    Private _Filesystem As DigitalData.Modules.Filesystem.File

    ' Runtime variables
    Private _IsLoading As Boolean = True
    Private _ActiveGrid As GridControl = Nothing
    Private _ActiveGridBand As GridBand = Nothing
    Private _DocumentInfo As DocumentInfo = Nothing

    ' TODO: Hashes for checking if the opened file was modified externally
    Private _HashOriginalFile As String = Nothing
    Private _HashOpenedFile As String = Nothing

    Private WithEvents _FileOpenTimer As New Timer
    Private _FileOpenList As New Dictionary(Of Integer, String)

    Private Property OperationMode As IResultForm.Mode Implements IResultForm.OperationMode

    Public Property ShouldReturnToPreviousForm As Boolean = False Implements IResultForm.ShouldReturnToPreviousForm

    Public Sub New(LogConfig As LogConfig, Environment As Environment, Params As DocumentResultParams)
        ' Dieser Aufruf ist für den Designer erforderlich.
        InitializeComponent()

        ' Fügen Sie Initialisierungen nach dem InitializeComponent()-Aufruf hinzu.
        Dim oConfigPath As String = Path.Combine(Application.UserAppDataPath, "ResultList", Params.WindowGuid)

        COLUMN_DOCID = Params.ColumnNames.ObjectIdColumn
        COLUMN_FILENAME = Params.ColumnNames.FilenameColumn
        COLUMN_FILEPATH = Params.ColumnNames.FullPathColumn

        _LogConfig = LogConfig
        _Logger = LogConfig.GetLogger()
        _Config = New ConfigManager(Of DocumentResultConfig)(LogConfig, oConfigPath, oConfigPath)
        _Helpers = New DocumentResultList(LogConfig)
        _Filesystem = New Modules.Filesystem.File(_LogConfig)

        _Environment = Environment
        _Params = Params
        _ResultLists = Params.Results

        _FileOpenTimer.Interval = FILE_OPEN_TIMER_INTERVAL
        _FileOpenTimer.Start()
    End Sub

    Private Sub frmDocumentResultList_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Try
            If _Environment.Service.IsActive AndAlso _Environment.Service.Address <> String.Empty Then
                OperationMode = IResultForm.Mode.WithAppServer
            Else
                OperationMode = IResultForm.Mode.NoAppServer
            End If

            If OperationMode = IResultForm.Mode.WithAppServer Then
                InitAppServer()
            End If

            ' Initialize Viewer with GDPicture.NET License
            If _Environment.Settings.GdPictureKey = String.Empty Then
                Throw New ApplicationException("GDPicture Licensekey is missing!")
            End If
            DocumentViewer1.Init(_LogConfig, _Environment.Settings.GdPictureKey)

            'Load config
            SplitContainerControl1.SplitterPosition = _Config.Config.SplitContainer1Distance
            SwitchMainContainerHorizontal.Checked = _Config.Config.SplitContainer1Horizontal
            SplitContainerControl2.SplitterPosition = _Config.Config.SplitContainer2Distance
            SwitchDetailContainerHorizontal.Checked = _Config.Config.SplitContainer2Horizontal

            If OperationMode <> IResultForm.Mode.NoAppServer Then
                ' Location and size will be managed by the ZooFlow Search Window
                If Utils.IsVisibleOnAnyScreen(_Config.Config.WindowLocation) Then
                    If Utils.LocationIsVisible(_Config.Config.WindowLocation) Then
                        Location = _Config.Config.WindowLocation
                    End If
                    If Utils.SizeIsVisible(_Config.Config.WindowSize) Then
                        Size = _Config.Config.WindowSize
                    End If
                End If

                SwitchMainContainerHorizontal.Visibility = DevExpress.XtraBars.BarItemVisibility.Never
                SwitchDetailContainerHorizontal.Visibility = DevExpress.XtraBars.BarItemVisibility.Never
            End If

            AddHandler GridView1.FocusedRowChanged, AddressOf GridView_FocusedRowChanged
            AddHandler GridView2.FocusedRowChanged, AddressOf GridView_FocusedRowChanged
            AddHandler GridView3.FocusedRowChanged, AddressOf GridView_FocusedRowChanged

            UpdateTotalResults()
            UpdateGridData()
        Catch ex As Exception
            _Logger.Error(ex)
            MessageBox.Show("Error while loading results:" & vbNewLine & vbNewLine & ex.Message, Text)
        Finally
            _IsLoading = False
        End Try
    End Sub

    Private Sub GridView_FocusedRowChanged(sender As GridView, e As FocusedRowChangedEventArgs)
        _Helpers.SetRowHandle(e)

        Try
            Reset_Errors()
            Cursor = Cursors.WaitCursor

            If e.FocusedRowHandle >= 0 Then
                Dim oRow = sender.GetDataRow(e.FocusedRowHandle)
                DocumentViewer1.CloseDocument()

                If OperationMode = IResultForm.Mode.NoAppServer Then
                    LoadFile_Legacy(oRow)
                ElseIf OperationMode = IResultForm.Mode.WithAppServer Then
                    LoadFile_IDB(oRow)
                End If

                If IsNothing(_DocumentInfo) Then
                    Show_Warning("File could not be loaded!")
                End If

                If Not IsNothing(_DocumentInfo) Then
                    If _FileOpenList.ContainsValue(_DocumentInfo.FullPath) Then
                        Show_Warning("Die ausgewählte Datei befindet sich im Zugriff!")
                    Else
                        DocumentViewer1.LoadFile(_DocumentInfo.FullPath)

                        If _DocumentInfo.AccessRight = Rights.AccessRight.VIEW_ONLY Then
                            DocumentViewer1.SetViewOnly(True)
                            RibbonPageGroup_Export.Visible = False
                        Else
                            DocumentViewer1.SetViewOnly(False)
                            RibbonPageGroup_Export.Visible = True
                        End If
                    End If
                End If

                ' TODO: Create checksum after closing, compare and take action
                If File.Exists(_DocumentInfo.FullPath) Then
                    _HashOriginalFile = _Filesystem.GetChecksum(_DocumentInfo.FullPath)
                Else
                    _HashOriginalFile = Nothing
                End If
            End If
        Catch ex As Exception
            _Logger.Error(ex)
            Show_CriticalError(ex.Message)
        Finally
            Cursor = Cursors.Default
        End Try
    End Sub

    Private Function InitAppServer() As Boolean
        Dim oSplit As List(Of String) = _Environment.Service.Address.Split(":").ToList()
        Dim oAddress As String = oSplit.Item(0)
        Dim oPort As Integer = oSplit.Item(1)

        _IDBClient = New Client(_LogConfig, oAddress, oPort)

        If Not _IDBClient.Connect() Then
            _Logger.Warn("Client could not connect to Service at [{0}]", _Environment.Service.Address)
            Return False
        End If

        Return True
    End Function

    Private Sub LoadFile_Legacy(GridRow As DataRow)
        Try
            Dim oFullPath = GridRow.Item(COLUMN_FILEPATH)

            _DocumentInfo = New DocumentInfo() With {
                .AccessRight = Rights.AccessRight.FULL,
                .FullPath = oFullPath
            }
        Catch ex As Exception
            _Logger.Error(ex)
            MsgBox("Error while loading file", MsgBoxStyle.Critical, Text)
        End Try
    End Sub

    Private Sub LoadFile_IDB(GridRow As DataRow)
        Try
            Dim oObjectId = GridRow.Item(COLUMN_DOCID)
            _Logger.Debug($"Gettin' Infor for oObjectId: {oObjectId}")

            ' This needs to be Sync bc otherwise the PopupMenuShowing event will fire before this method loaded the Document Info
            _DocumentInfo = _IDBClient.GetDocumentInfo(_Environment.User.UserId, oObjectId)
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Public Function RefreshResults(pResults As IEnumerable(Of BaseResult)) As Boolean Implements IResultForm.RefreshResults
        _IsLoading = True
        Try
            UpdateTotalResults()
            UpdateGridData()

            Return True
        Catch ex As Exception
            _Logger.Error(ex)
            MessageBox.Show("Error while loading results:" & vbNewLine & vbNewLine & ex.Message, Text)
            Return False
        Finally
            _IsLoading = False
        End Try
    End Function

    Private Sub ClearGridData()
        GridControl1.DataSource = Nothing
    End Sub

    Private Sub LoadGridData(Result As DocumentResult)
        If Result.Datatable.Columns.Contains(COLUMN_DOCID) = False Then
            Throw New ApplicationException($"Datatable is missing DocId Column [{COLUMN_DOCID}] for search {Result.Title}!")
        End If

        If OperationMode = IResultForm.Mode.NoAppServer And Result.Datatable.Columns.Contains(COLUMN_FILEPATH) = False Then
            Throw New ApplicationException($"Datatable is missing Filepath Column [{COLUMN_FILEPATH}] for search {Result.Title}!")
        End If

        GridControl1.DataSource = Result.Datatable
        GridControl1.ForceInitialize()
    End Sub

    Private Sub UpdateGridData()
        ' Load Grids
        For oIndex = 0 To _ResultLists.Count - 1
            Select Case oIndex
                Case 0
                    Dim oResult As DocumentResult = _ResultLists.Item(0)

                    LoadGridData(oResult)
                    CreateDocumentGrid(GridView1, oResult)
                    RestoreLayout(GridView1)
                    UpdateGridHeader(_ResultLists, oIndex, oResult.Datatable.Rows.Count)

                Case 1
                    Dim oResult As DocumentResult = _ResultLists.Item(1)

                    LoadGridData(oResult)
                    CreateDocumentGrid(GridView2, oResult)
                    RestoreLayout(GridView2)
                    UpdateGridHeader(_ResultLists, oIndex, oResult.Datatable.Rows.Count)

                Case 2
                    Dim oResult As DocumentResult = _ResultLists.Item(2)

                    LoadGridData(oResult)
                    CreateDocumentGrid(GridView3, oResult)
                    RestoreLayout(GridView3)
                    UpdateGridHeader(_ResultLists, oIndex, oResult.Datatable.Rows.Count)

                Case Else
                    MessageBox.Show(Constants.MESSAGE_TOO_MANY_SEARCHES, Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
                    Exit For
            End Select
        Next

        ' Hide Grids depending on Result count
        Select Case _ResultLists.Count
            Case 0

                SplitContainerControl1.SetPanelCollapsed(True)
                SplitContainerControl2.SetPanelCollapsed(True)

                SwitchMainContainerHorizontal.Enabled = False
                SwitchDetailContainerHorizontal.Enabled = False

                MessageBox.Show(Constants.MESSAGE_ERROR_IN_SEARCHES, Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
            Case 1
                SplitContainerControl1.PanelVisibility = DevExpress.XtraEditors.SplitPanelVisibility.Panel1
                SplitContainerControl2.PanelVisibility = DevExpress.XtraEditors.SplitPanelVisibility.Panel1

                SplitContainerControl1.SetPanelCollapsed(True)
                SplitContainerControl2.SetPanelCollapsed(True)

                SwitchMainContainerHorizontal.Enabled = False
                SwitchDetailContainerHorizontal.Enabled = False
            Case 2
                SplitContainerControl1.PanelVisibility = DevExpress.XtraEditors.SplitPanelVisibility.Both
                SplitContainerControl2.PanelVisibility = DevExpress.XtraEditors.SplitPanelVisibility.Panel1

                SplitContainerControl2.SetPanelCollapsed(True)

                SwitchDetailContainerHorizontal.Enabled = False
        End Select
    End Sub

    Private Sub UpdateTotalResults()
        Dim oTotalResults = 0

        For Each oList In _ResultLists
            oTotalResults += oList.Datatable.Rows.Count
        Next

        labelResultCount.Caption = String.Format(labelResultCount.Caption, oTotalResults)
    End Sub
    Private Sub UpdateGridHeader(pResultList As List(Of DocumentResult), pIndex As Integer, pCount As Integer)
        Select Case pIndex
            Case 0
                Dim oResult = pResultList.Item(0)
                GridBand1.Caption = $"{oResult.Title} ({pCount})"

            Case 1
                Dim oResult = pResultList.Item(1)
                GridBand2.Caption = $"{oResult.Title} ({pCount})"

            Case 2
                Dim oResult = pResultList.Item(2)
                GridBand3.Caption = $"{oResult.Title} ({pCount})"
        End Select
    End Sub

    Private Sub CreateDocumentGrid(GridView As BandedGridView, Result As DocumentResult)
        Try
            If IsNothing(GridView.Columns("ICON")) Then
                Dim oIconColumn = GridView.Columns.AddVisible("ICON", "ICON")
                With oIconColumn
                    .OptionsColumn.AllowSort = False
                    .OptionsColumn.AllowSize = False
                    .OptionsColumn.ShowCaption = False
                    .OptionsColumn.FixedWidth = True
                    .Width = 20
                    .MaxWidth = 20
                    .MinWidth = 20
                End With

                Dim oFirstBand As GridBand = GridView.Bands.First()
                oFirstBand.Columns.Add(oIconColumn)
                oFirstBand.Columns.MoveTo(0, oIconColumn)
            End If

            Dim oCreated, oChanged As String
            If _Environment?.User?.Language <> "de-DE" Then
                oChanged = "Changed"
                oCreated = "Created"
            Else
                oChanged = "Geändert"
                oCreated = "Erstellt"
            End If

            Try
                Dim oDocIdColumn As GridColumn = GridView.Columns(COLUMN_DOCID)
                If Not IsNothing(oDocIdColumn) Then
                    oDocIdColumn.Visible = False
                End If

                Dim oFilePathColumn As GridColumn = GridView.Columns(COLUMN_FILEPATH)
                If Not IsNothing(oFilePathColumn) Then
                    oFilePathColumn.Visible = False

                    ' Hide Fullpath column completely in AppServer-Mode
                    If OperationMode = IResultForm.Mode.WithAppServer Then
                        oFilePathColumn.OptionsColumn.ShowInCustomizationForm = False
                    End If
                End If

                Dim oCreatedColumn = GridView.Columns(oCreated)
                If Not IsNothing(oCreatedColumn) Then
                    oCreatedColumn.DisplayFormat.FormatType = FormatType.DateTime
                    oCreatedColumn.DisplayFormat.FormatString = _Environment.User.DateFormat & " HH:MM:ss"
                End If

                Dim oChangedColumn = GridView.Columns(oChanged)
                If Not IsNothing(oChangedColumn) Then
                    oChangedColumn.DisplayFormat.FormatType = FormatType.DateTime
                    oChangedColumn.DisplayFormat.FormatString = _Environment.User.DateFormat & " HH:MM:ss"
                End If
            Catch ex As Exception
                _Logger.Error(ex)
            End Try

            GridView.OptionsView.BestFitMaxRowCount = 30
            GridView.BestFitColumns()
        Catch ex As ApplicationException
            MsgBox($"Error while loading grid data for search {Result.Title}: {vbNewLine}{vbNewLine}{ex.Message}", MsgBoxStyle.Critical, Text)
            _Logger.Error(ex)
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Private Sub GridView1_CustomDrawCell(sender As Object, e As RowCellCustomDrawEventArgs) Handles GridView1.CustomDrawCell
        If e.RowHandle < 0 Then
            Exit Sub
        End If

        Dim oView As GridView = TryCast(sender, GridView)
        Dim oCellInfo As GridCellInfo = TryCast(e.Cell, GridCellInfo)
        Dim oRow As DataRow = oView.GetDataRow(e.RowHandle)
        Dim oValue = oRow.Item(COLUMN_FILENAME)

        e.DefaultDraw()

        If e.Column.FieldName = COLUMN_ICON Then
            Dim oIcon = _Helpers.GetIconByExtension(oValue)
            Dim offsetX = 0
            Dim offsetY = 0

            e.Cache.DrawImage(oIcon, e.Bounds.X + offsetX, e.Bounds.Y + offsetY, 18, 18)
        End If
    End Sub

    Private Function TryGetItem(DataRow As DataRow, ColumnName As String, Optional DefaultValue As String = "") As String
        Try
            Return DataRow.Item(ColumnName)
        Catch ex As Exception
            Return DefaultValue
        End Try
    End Function

    Private Sub SwitchMainContainerHorizontal_CheckedChanged(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles SwitchMainContainerHorizontal.CheckedChanged
        SplitContainerControl1.Horizontal = SwitchMainContainerHorizontal.Checked

        If _Config IsNot Nothing And _IsLoading = False Then
            _Config.Config.SplitContainer1Horizontal = SwitchMainContainerHorizontal.Checked
            _Config.Save()
        End If
    End Sub

    Private Sub SwitchDetailContainerHorizontal2_CheckedChanged(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles SwitchDetailContainerHorizontal.CheckedChanged
        SplitContainerControl2.Horizontal = SwitchDetailContainerHorizontal.Checked

        If _Config IsNot Nothing And _IsLoading = False Then
            _Config.Config.SplitContainer2Horizontal = SwitchDetailContainerHorizontal.Checked
            _Config.Save()
        End If
    End Sub

    Private Sub BarButtonItemExportGrid1_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItemExportGrid1.ItemClick
        Dim oActiveGrid = GetActiveGridControl()

        If oActiveGrid IsNot Nothing Then
            Dim oGridBand = _ActiveGridBand

            XtraSaveFileDialog.FileName = Utils.ConvertTextToSlug(oGridBand.Caption) & ".xlsx"
            XtraSaveFileDialog.DefaultExt = ".xlsx"

            If XtraSaveFileDialog.ShowDialog() = Windows.Forms.DialogResult.OK Then
                Dim oOptions As New XlsxExportOptions() With {
                    .ExportMode = XlsxExportMode.SingleFile
                }
                oActiveGrid.ExportToXlsx(XtraSaveFileDialog.FileName, oOptions)
            End If

        Else
            MessageBox.Show("Bitte wählen Sie eine Tabelle aus, die Sie exportieren möchten", Text, MessageBoxButtons.OK)
        End If
    End Sub

    Private Sub SplitContainerControl1_SplitterPositionChanged(sender As Object, e As EventArgs) Handles SplitContainerControl1.SplitterPositionChanged
        If _IsLoading = False Then
            _Config.Config.SplitContainer1Distance = SplitContainerControl1.SplitterPosition
            _Config.Save()
        End If
    End Sub

    Private Sub SplitContainerControl2_SplitterPositionChanged(sender As Object, e As EventArgs) Handles SplitContainerControl2.SplitterPositionChanged
        If _IsLoading = False Then
            _Config.Config.SplitContainer2Distance = SplitContainerControl2.SplitterPosition
            _Config.Save()
        End If
    End Sub

    Private Function GetActiveRow() As DataRow
        Dim oActiveGrid = GetActiveGridControl()
        Dim oActiveRowhandle = _Helpers.ActiveRowHandle

        If oActiveGrid IsNot Nothing And oActiveRowhandle <> Constants.NO_ROW_HANDLE Then
            Dim oView = DirectCast(oActiveGrid.DefaultView, GridView)
            Dim oRow = oView.GetDataRow(oActiveRowhandle)
            Return oRow
        Else
            Return Nothing
        End If
    End Function
    Private Function GetDevexpressGrid_LayoutName(pGridView As GridView)
        Dim Filename As String = $"DevExpressGridViewDocResult_{pGridView.Name}UserLayout.xml"
        Return Path.Combine(_Config.UserConfigPath.Replace("UserConfig.xml", ""), Filename)
    End Function
    Private Function GetActiveGridControl() As GridControl
        If _ActiveGrid Is Nothing Then
            Return Nothing
        End If

        Return _ActiveGrid
    End Function

    Private Sub GridViewSave_Layout(pGridView As GridView)
        Try
            Dim oXml As String = GetDevexpressGrid_LayoutName(pGridView)
            pGridView.SaveLayoutToXml(oXml, OptionsLayoutBase.FullLayout)
        Catch ex As Exception
            _Logger.Error(ex)
            _Logger.Info("Error while saving GridLayout: " & ex.Message)
        End Try
    End Sub
    Private Sub RestoreLayout(pGridView As GridView)
        Try
            Dim oLayoutFile As String = GetDevexpressGrid_LayoutName(pGridView)
            If File.Exists(oLayoutFile) Then
                pGridView.RestoreLayoutFromXml(oLayoutFile, OptionsLayoutBase.FullLayout)
            End If
        Catch ex As Exception
            _Logger.Error(ex)
            _Logger.Info("Error while restoring layout: " & ex.Message)
        End Try
    End Sub

    Private Sub GridControl_Enter(sender As GridControl, e As EventArgs) Handles GridControl1.Enter, GridControl2.Enter, GridControl3.Enter
        _ActiveGrid = sender
        BarButtonItem5.Visibility = DevExpress.XtraBars.BarItemVisibility.Always
        BarButtonItemExportGrid1.Visibility = DevExpress.XtraBars.BarItemVisibility.Always
        SetActiveGridBand()
    End Sub

    Private Sub GridView1_FocusedRowChanged(sender As GridView, e As FocusedRowChangedEventArgs) Handles GridView1.FocusedRowChanged, GridView2.FocusedRowChanged, GridView3.FocusedRowChanged
        Dim oGrid As GridControl = sender.GridControl
        _ActiveGrid = oGrid
    End Sub

    Private Sub SetActiveGridBand()
        If _ActiveGrid.Equals(GridControl1) Then
            _ActiveGridBand = GridBand1
        ElseIf _ActiveGrid.Equals(GridControl2) Then
            _ActiveGridBand = GridBand2
        ElseIf _ActiveGrid.Equals(GridControl3) Then
            _ActiveGridBand = GridBand3
        Else
            _ActiveGridBand = Nothing
        End If
    End Sub

    Private Sub OpenFolderPath()
        Try
            Dim oRow = GetActiveRow()

            If oRow IsNot Nothing Then
                Dim oFilename = _DocumentInfo.FullPath
                Dim oDirectory = IO.Path.GetDirectoryName(oFilename)
                Process.Start(oDirectory)
            End If
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Private Sub OpenFile()
        Try
            If _DocumentInfo IsNot Nothing Then
                Dim oFilename = _DocumentInfo.FullPath
                DocumentPropertyMenu_FileOpened(Me, oFilename)
            End If
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub



    Private Sub CopyFileName()
        Try
            Dim oRow = GetActiveRow()

            If oRow IsNot Nothing Then
                Dim oFilename = _DocumentInfo.FullPath
                Clipboard.SetText(oFilename)
            End If
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Private Sub OpenProperties()
        Try
            Dim oRow = GetActiveRow()

            If oRow IsNot Nothing Then
                Dim oObjectId = oRow.Item(COLUMN_DOCID)
                Dim oPropertyDialog As New frmObjectPropertyDialog(_LogConfig, _Environment, _IDBClient, oObjectId)
                oPropertyDialog.Show()
            End If
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Private Sub GridView1_ColumnFilterChanged(sender As GridView, e As EventArgs) Handles GridView1.ColumnFilterChanged
        Dim oRowCount = sender.RowCount
        UpdateGridHeader(_ResultLists, 0, oRowCount)
    End Sub

    Private Sub GridView2_ColumnFilterChanged(sender As GridView, e As EventArgs) Handles GridView2.ColumnFilterChanged
        Dim oRowCount = sender.RowCount
        UpdateGridHeader(_ResultLists, 1, oRowCount)
    End Sub

    Private Sub GridView3_ColumnFilterChanged(sender As GridView, e As EventArgs) Handles GridView3.ColumnFilterChanged
        Dim oRowCount = sender.RowCount
        UpdateGridHeader(_ResultLists, 2, oRowCount)
    End Sub

    Private Sub BarButtonItem4_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonBack.ItemClick
        ShouldReturnToPreviousForm = True
        Close()
    End Sub

    Private Sub frmDocumentResultList_Closing(sender As Object, e As CancelEventArgs) Handles Me.Closing
        Try
            _Config.Config.WindowLocation = Location
            _Config.Config.WindowSize = Size
            _Config.Save()

            DocumentViewer1.Done()
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Private Sub GridControl_DoubleClick(sender As Object, e As EventArgs) Handles GridControl1.DoubleClick, GridControl2.DoubleClick, GridControl3.DoubleClick
        If _DocumentInfo IsNot Nothing And _DocumentInfo.AccessRight > Rights.AccessRight.VIEW_ONLY Then
            OpenFile()
        End If
    End Sub

    Private Sub GridView_PopupMenuShowing(sender As Object, e As PopupMenuShowingEventArgs) _
        Handles GridView2.PopupMenuShowing, GridView3.PopupMenuShowing, GridView1.PopupMenuShowing
        Try
            Dim oView As GridView = sender

            If e.MenuType = GridMenuType.Row Then
                Dim oRowHandle = e.HitInfo.RowHandle
                Dim oRow As DataRow = oView.GetDataRow(oRowHandle)
                Dim oFilepath As String = _DocumentInfo.FullPath
                Dim oObjectId As Long = oRow.Item(COLUMN_DOCID)
                Dim oMenu As New DocumentPropertyMenu(_LogConfig, _Environment, _IDBClient, oFilepath, oObjectId)

                e.Menu.Items.Clear()

                For Each oItem In oMenu.GetMenuItems(OperationMode, _DocumentInfo.AccessRight)
                    e.Menu.Items.Add(oItem)
                Next

                AddHandler oMenu.FileOpened, AddressOf DocumentPropertyMenu_FileOpened
                ' AddHandler oMenu.FileClosed, AddressOf DocumentPropertyMenu_FileClosed
            End If
        Catch ex As Exception
            _Logger.Error(ex)
            MsgBox("Unexpected Error while preparing context menu", MsgBoxStyle.Critical, Text)
        End Try
    End Sub

    Public Sub DocumentPropertyMenu_FileOpened(sender As Object, FilePath As String)
        DocumentViewer1.CloseDocument()

        Dim oProcess = Process.Start(New ProcessStartInfo With {
            .FileName = FilePath
        })
        _FileOpenList.Add(oProcess.Id, FilePath)
    End Sub

    Public Sub FileOpenTimer_Elapsed() Handles _FileOpenTimer.Tick
        Try
            Dim oProcesses = Process.GetProcesses()
            Dim oIds = (From oProc In oProcesses
                        Select oProc.Id).
                        ToList()

            Dim oNewFileOpenList As New Dictionary(Of Integer, String)
            For Each oOpenFile In _FileOpenList
                If oIds.Contains(oOpenFile.Key) Then
                    oNewFileOpenList.Add(oOpenFile.Key, oOpenFile.Value)
                End If
            Next

            If oNewFileOpenList.Count < _FileOpenList.Count Then
                Dim oClosedFiles = _FileOpenList.
                    Except(oNewFileOpenList).
                    ToList()

                If oClosedFiles.Count = 1 Then
                    Dim oOpenFile = oClosedFiles.First()
                    DocumentViewer1.LoadFile(oOpenFile.Value)
                Else
                    ClearGridData()
                    UpdateGridData()
                End If

                _FileOpenList = oNewFileOpenList
            End If
        Catch ex As Exception
            _Logger.Error(ex)
        End Try
    End Sub

    Public Sub Show_CriticalError(Message As String)
        labelCriticalError.Visibility = DevExpress.XtraBars.BarItemVisibility.Always
        labelCriticalError.Caption = Message
    End Sub

    Public Sub Show_Warning(Message As String)
        labelWarning.Visibility = DevExpress.XtraBars.BarItemVisibility.Always
        labelWarning.Caption = Message
    End Sub

    Public Sub Reset_Errors()
        labelCriticalError.Visibility = DevExpress.XtraBars.BarItemVisibility.Never
        labelWarning.Visibility = DevExpress.XtraBars.BarItemVisibility.Never
    End Sub

    Private Sub BarButtonItem5_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItem5.ItemClick
        If Not IsNothing(_ActiveGrid) Then
            Try
                Dim oFile = GetDevexpressGrid_LayoutName(_ActiveGrid.MainView)
                If File.Exists(oFile) Then
                    File.Delete(oFile)
                End If
                UpdateGridData()
            Catch ex As Exception
                _Logger.Error(ex)
            End Try
        End If
    End Sub

    Private Sub frmDocumentResultList_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
        GridViewSave_Layout(_ActiveGrid.MainView)
    End Sub

    Private _DragBoxFromMouseDown As Rectangle
    Private _ScreenOffset As Point

    Private Sub GridView1_MouseDown(sender As GridView, e As MouseEventArgs) Handles GridView1.MouseDown
        If sender.FocusedRowHandle >= 0 Then
            Dim oDragSize As Size = SystemInformation.DragSize

            _DragBoxFromMouseDown = New Rectangle(New Point(e.X - (oDragSize.Width / 2),
                                                            e.Y - (oDragSize.Height / 2)), oDragSize)

        Else
            _DragBoxFromMouseDown = Rectangle.Empty
        End If
    End Sub

    Private Sub GridView1_MouseUp(sender As GridView, e As MouseEventArgs) Handles GridView1.MouseUp
        _DragBoxFromMouseDown = Rectangle.Empty
    End Sub

    Private Sub GridView1_MouseMove(sender As GridView, e As MouseEventArgs) Handles GridView1.MouseMove
        If e.Button AndAlso e.Button = MouseButtons.Left Then
            If _DragBoxFromMouseDown <> Rectangle.Empty And Not _DragBoxFromMouseDown.Contains(e.X, e.Y) Then

                Dim oHitInfo = sender.CalcHitInfo(e.Location)

                If oHitInfo.InRow Then
                    If _DocumentInfo IsNot Nothing AndAlso _DocumentInfo.AccessRight > Rights.AccessRight.VIEW_ONLY Then
                        _ScreenOffset = SystemInformation.WorkingArea.Location

                        Dim oFullPath As String = _DocumentInfo.FullPath
                        Dim oFiles As String() = {oFullPath}
                        Dim oData As New DataObject(DataFormats.FileDrop, oFiles)

                        sender.GridControl.DoDragDrop(oData, DragDropEffects.All)
                    End If
                End If
            End If
        End If
    End Sub
End Class