Imports System.IO

Public Class ClassIndexFunctions
    Public Shared Function FileExistsinDropTable(Filename As String) As Date
        Dim oSQL As String
        Dim oHash As String

        Try
            If Filename.Contains("'") Then
                Filename = Filename.Replace("'", "''")
            End If

            ' If file cannot be accessed, checksum cannot be generated
            ' In this case, the file should be treated as not yet existing
            oHash = FILESYSTEM.GetChecksum(Filename)

            If oHash Is Nothing Then
                LOGGER.Warn("Checksum for file {0} could not be generated. Treating as new file.", Filename)
                Return Nothing
            End If

            oSQL = "SELECT *  FROM TBGI_FILES_USER WHERE UPPER(FILE_HASH) = UPPER('" & oHash & "') AND WORKED = 0 ORDER BY ADDED_WHEN"
            Dim oResult As DataTable = ClassDatabase.Return_Datatable_CS(oSQL, MyConnectionString, True)

            If oResult Is Nothing Then
                Return Nothing
            End If

            If oResult.Rows.Count = 0 Then
                oSQL = "SELECT * FROM TBGI_HISTORY WHERE UPPER(FILE_HASH) = UPPER('" & oHash & "') ORDER BY ADDED_WHEN"
                oResult = ClassDatabase.Return_Datatable_CS(oSQL, MyConnectionString, True)

                If oResult Is Nothing Then
                    Return Nothing
                End If

                If oResult.Rows.Count = 0 Then
                    Return Nothing
                Else
                    Dim oFirstRow As DataRow = oResult.Rows.Item(0)
                    Return oFirstRow.Item("ADDED_WHEN")
                End If
            Else
                Dim oFirstRow As DataRow = oResult.Rows.Item(0)
                Return oFirstRow.Item("ADDED_WHEN")
            End If
        Catch ex As Exception
            MsgBox("Error in FileExistsinDropTable - Error-Message:" & vbNewLine & ex.Message & vbNewLine & "SQL-Command:" & vbNewLine & oSQL, MsgBoxStyle.Critical)
            Return Nothing
        End Try
    End Function

    Public Shared Function CheckDuplicateFiles(Filepath As String, ModuleTitle As String)
        Dim oFileInfo As New FileInfo(Filepath)
        Dim oFilename As String = oFileInfo.Name
        Dim oFileExists As Date = FileExistsinDropTable(Filepath)

        If oFileExists.Equals(Date.MinValue) Then
            Return True
        Else
            Dim oResult As DialogResult
            Dim oDate As String = oFileExists.ToString("d")
            Dim oBoxTitle = $"GLOBIX - {ModuleTitle}"
            Dim oBoxOptions = MsgBoxStyle.Question Or MsgBoxStyle.YesNo

            If USER_LANGUAGE = "de-DE" Then
                oResult = MsgBox($"Die Datei [{oFilename}] wurde bereits am [{oDate}] verarbeitet. Wollen Sie die gleiche Datei noch einmal verarbeiten?", oBoxOptions, oBoxTitle)
            Else
                oResult = MsgBox($"The file [{oFilename}] has already been processed at [{oDate}]. Do you want to process the same file again?", oBoxOptions, oBoxTitle)
            End If

            If oResult = DialogResult.Yes Then
                Return True
            End If
        End If

        Return False
    End Function
End Class