Imports System.IO
Imports System.Globalization

Public Class ClassHelper
    Public Shared Function Convert_Date(input As String, format As String)
        Try
            Dim dt As Date = CDate(input)
            Dim result = dt.ToString(format, CultureInfo.InvariantCulture)
            Return result
        Catch ex As Exception
            ClassLogger.Add("Unexpected Error while converting value '" & input & "' to date....." & ex.Message, False)
            Return input
        End Try

    End Function
    Public Shared Function CheckDBNull(input As Object, back_Value As String)
        If IsDBNull(input) Then
            If back_Value = "String" Then
                Return ""
            Else
                Return True
            End If
        Else
            If back_Value = "String" Then
                Return input.ToString
            Else
                Return False
            End If
        End If
    End Function
    Public Shared Function Get_TempFilename()
        'Eine tempfile generieren
        Dim tempFilename = My.Computer.FileSystem.GetTempFileName()
        'Nur den Filenamen ohne Erweiterung
        Dim tempName = Path.GetDirectoryName(tempFilename) & "\" & Path.GetFileNameWithoutExtension(tempFilename)
        'tempfile lsöchen
        If My.Computer.FileSystem.FileExists(tempFilename) Then
            My.Computer.FileSystem.DeleteFile(tempFilename)
        End If
        Return tempName
    End Function
    Public Shared Function CheckFileIsInUse(ByVal filename) As Boolean
        Dim fs As Integer = FreeFile()
        Dim inuse As Boolean = False
        If File.Exists(filename) Then
            Try
                Using f As New IO.FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.None)
                    ' thisFileInUse = False
                End Using
            Catch
                inuse = True
            End Try

            Try
                FileOpen(fs, filename, OpenMode.Binary, OpenAccess.ReadWrite, OpenShare.LockReadWrite)
            Catch ex As Exception
                ClassLogger.Add("File " & filename & " inuse or not able to open - message: " & ex.Message, True)
                inuse = True
            Finally
                FileClose(fs)
            End Try
        End If
        Return inuse
    End Function
    Public Shared Function Versionierung_Datei(Dateiname As String)
        Dim extension
        Dim _NewFileString
        Try
            Dim version As Integer = 1

            Dim Stammname As String = Path.GetDirectoryName(Dateiname) & "\" & Path.GetFileNameWithoutExtension(Dateiname)
            extension = Path.GetExtension(Dateiname)

            Dim _neuername As String = Stammname
            'Dim MoveFilename As String = DATEINAME.Replace(element.Value, "")
            'Überprüfen ob File existiert
            If File.Exists(_neuername & extension) = False Then
                _NewFileString = _neuername
            Else
                Do While File.Exists(_neuername & extension)
                    version = version + 1
                    _neuername = Stammname & "~" & version
                    _NewFileString = _neuername
                Loop
            End If
            Return _NewFileString & extension
        Catch ex As Exception
            ClassLogger.Add(" - Error in versioning file - error: " & vbNewLine & ex.Message)
            MsgBox(ex.Message, MsgBoxStyle.Critical, "Error in versioning file:")
            Return ""
        End Try

    End Function
    '' <summary>
    ''' Ersetzt alle nicht zulässigen Zeichen im angegebenen Dateinamen
    ''' </summary>
    ''' <param name="sFilename">Dateiname ohne Pfadangabe</param>
    ''' <param name="sChar">Ersatzzeichen für alle unzulässigen Zeichen 
    ''' im Dateinamen</param>
    Public Shared Function CleanFilename(ByVal sFilename As String, _
      Optional ByVal REPLACEChar As String = "") As String

        ' alle nicht zulässigen Zeichen ersetzen
        Return System.Text.RegularExpressions.Regex.Replace( _
          sFilename, "[?*^""<>|]", REPLACEChar)
    End Function
    Public Shared Sub File_open(RESULT_DOC_PATH As Object, DocID As String)
        Try
            If RESULT_DOC_PATH <> Nothing Then
                Dim EXT = Path.GetExtension(RESULT_DOC_PATH)
                EXT = EXT.Replace(".", "")
                Dim sql = String.Format("SELECT VIEWER FROM TBPMO_DOC_USER_VIEW WHERE USER_ID = {0} AND UPPER(FILE_EXTENSION) = UPPER('{1}')", USER_GUID, EXT)
                Dim DT As DataTable = ClassDatabase.Return_Datatable(sql)
                If DT.Rows.Count = 1 Then
                    Select Case DT.Rows(0).Item("VIEWER")
                        Case "DOC_VIEW"
                            Try
                                Dim DocView
                                DocView = Nothing
                                DocView = CreateObject("WMPViewXNG.Viewer")
                                ' open the viewer
                                Dim viewer_string = RESULT_DOC_PATH.Substring(2)
                                DocView.ViewFile(viewer_string)
                                CURRENT_DOCVIEW_PATH = viewer_string
                                CURRENT_DOCVIEW = DocView
                            Catch ex As Exception
                                MsgBox("Unexpected Error in DocView Open:" & vbNewLine & ex.Message & vbNewLine & RESULT_DOC_PATH & vbNewLine & "DocID: " & DocID, MsgBoxStyle.Critical)
                                ClassLogger.Add("Error in DocView Open: " & ex.Message & vbNewLine & " - Path: " & RESULT_DOC_PATH & " - DocID: " & DocID, True)
                                File_SYSOPEN(RESULT_DOC_PATH, DocID)
                            End Try
                    End Select
                Else
                    File_SYSOPEN(RESULT_DOC_PATH, DocID)
                End If
            Else
                If LogErrorsOnly = False Then ClassLogger.Add(" >> RESULT_DOC_PATH IS NOTHING")
            End If
        Catch ex As Exception
            MsgBox("Unexpected Error in File_open:" & vbNewLine & ex.Message & vbNewLine & RESULT_DOC_PATH & vbNewLine & "DocID: " & DocID, MsgBoxStyle.Critical)
            ClassLogger.Add("Error in File_open: " & ex.Message & vbNewLine & " - Path: " & RESULT_DOC_PATH & " - DocID: " & DocID, True)
        End Try
    End Sub
    Private Shared Sub File_SYSOPEN(RESULT_DOC_PATH As Object, DocID As String)
        Try
            If RESULT_DOC_PATH <> Nothing Then

                If System.IO.File.Exists(RESULT_DOC_PATH) = True Then
                    Process.Start(RESULT_DOC_PATH)
                Else
                    MsgBox("File Does Not Exist!", MsgBoxStyle.Exclamation)
                End If


            End If
        Catch ex As Exception
            MsgBox("Unexpected Error in File_SYSOPEN:" & vbNewLine & ex.Message & vbNewLine & RESULT_DOC_PATH & vbNewLine & "DocID: " & DocID, MsgBoxStyle.Critical)
            ClassLogger.Add("Error in File_SYSOPEN: " & ex.Message & vbNewLine & " - Path: " & RESULT_DOC_PATH & " - DocID: " & DocID, True)
        End Try

    End Sub
    Shared Function Convert_Date_2_Form_Format(p1 As Date) As Date
        Throw New NotImplementedException
    End Function

End Class