Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Logging
Imports DigitalData.Modules.Patterns
Imports DigitalData.Modules.Language
Imports DigitalData.Services.EDMIService.Methods.GetDatatableFromCache

Namespace Methods.GlobalIndexer.ImportFile
    Public Class ImportFileMethod
        Inherits BaseMethod

        Private ReadOnly TableStore As DataSet
        Private ReadOnly Patterns As Patterns2
        Private ReadOnly GetDatatable As GetDatatableFromCacheMethod

        Private ManualIndexes As DataTable
        Private AutomaticIndexes As DataTable
        Private ManualIndexesPostProcessing As DataTable

        Private Const VIEW_INDEX_MANUAL = "VWDDINDEX_MAN"
        Private Const VIEW_INDEX_AUTOMATIC = "VWDDINDEX_AUTOM"
        Private Const TABLE_POST_PROCESSING = "TBDD_INDEX_MAN_POSTPROCESSING"

        Private Const TYPE_VBSPLIT = "VBSPLIT"
        Private Const TYPE_VBREPLACE = "VBREPLACE"
        Private Const TYPE_REGEXPRESSION = "REG. EXPRESSION"

        Public Sub New(pLogConfig As LogConfig, pMSSQLServer As MSSQLServer, pTableStore As DataSet)
            MyBase.New(pLogConfig, pMSSQLServer)

            TableStore = pTableStore
            Patterns = New Patterns2(pLogConfig)
            GetDatatable = New GetDatatableFromCacheMethod(LogConfig, Database, TableStore)
        End Sub

        ''' <summary>
        ''' 
        ''' </summary>
        ''' <remarks>
        ''' 
        ''' 
        ''' 
        ''' </remarks>
        Public Function Run(pData As ImportFileRequest)
            Try
                LoadIndexes(pData.ProfileId)

                Dim oFinalAttributes = pData.AttributeValues

                ' apply the post processing
                oFinalAttributes = ApplyManualPostprocessing(oFinalAttributes, ManualIndexesPostProcessing)

                ' TODO: apply the manual attributes
                oFinalAttributes = ApplyAutomaticeAttributes(oFinalAttributes)


            Catch ex As Exception
                Return New ImportFileResponse(ex)
            End Try
        End Function

        Private Function ApplyManualPostprocessing(pManualAttributes As List(Of UserAttributeValue), pPostprocessingSteps As DataTable) As List(Of UserAttributeValue)
            Logger.Debug("Start of Method [ApplyManualPostprocessing]")
            Dim oAttributes = pManualAttributes

            For Each oProcessingRow As DataRow In pPostprocessingSteps.Rows

                Dim oIndexId = oProcessingRow.ItemEx(Of Integer)("IDXMAN_ID")
                Dim oIndexRow As DataRow = ManualIndexes.Select($"GUID = {oIndexId}").FirstOrDefault()
                Dim oIndex As UserAttributeValue = pManualAttributes.
                    Where(Function(attr) attr.AttributeId = oProcessingRow.ItemEx(Of Integer)("IDXMAN_ID")).
                    FirstOrDefault()

                Dim oValue = GetPostprocessingValue(oIndex.AttributeValues, oIndexRow)

                oAttributes.Add(New UserAttributeValue With {
                    .AttributeId = oIndexId,
                    .AttributeName = oIndex.AttributeName,
                    .AttributeValues = oIndex.AttributeValues,
                    .ControlName = oIndex.ControlName
                })
            Next

            Return oAttributes
        End Function

        Private Function ApplyAutomaticeAttributes(pManualAttributes As List(Of UserAttributeValue)) As List(Of UserAttributeValue)
            Logger.Debug("Start of Method [ApplyAutomaticeAttributes]")

            Return pManualAttributes
        End Function

        Private Function GetPostprocessingValue(pValues As List(Of String), pRow As DataRow)
            Logger.Debug("Start of Method [GetPostprocessingValue]")

            Dim oType = pRow.Item("TYPE")
            Dim oResult As New List(Of String)

            Logger.Debug("Type of Postprocessing is [{0}]", oType)

            Select Case oType
                Case TYPE_VBREPLACE
                    Dim oFindString = pRow.Item("TEXT1")
                    Dim oReplaceString = pRow.Item("TEXT2")

                    Logger.Debug("Replacing [{0}] with [{1}]", oFindString, oReplaceString)

                    For Each oIndexValue In pValues
                        Dim oReplaceResult = oIndexValue.Replace(oFindString, oReplaceString)
                        If oReplaceResult.Equals(oIndexValue) Then
                            Logger.Debug("Replace did not succeed, ReplaceString was not found.")
                        Else
                            Logger.Debug("Replace successful for [{0}].", oIndexValue)
                        End If

                        oResult.Add(oReplaceResult)
                    Next

                Case TYPE_VBSPLIT
                    Dim oSeparator As String = pRow.Item("TEXT1")
                    Dim oSplitIndex As Integer = 0
                    Integer.TryParse(pRow.Item("TEXT2"), oSplitIndex)

                    Logger.Debug("Splitting String at Separator [{0}] and Index [{1}]", oSeparator, oSplitIndex)

                    For Each oIndexValue In pValues
                        Dim oSplitted As List(Of String) = oIndexValue.Split(oSeparator).ToList()
                        Logger.Debug("Split succeeded, resulting list has [{0}] items.", oSplitted.Count)

                        If oSplitIndex < oSplitted.Count Then
                            Dim oValue = oSplitted.Item(oSplitIndex)
                            Logger.Debug("Saving value [{0}] from Index [{1}]", oValue, oSplitIndex)
                            oResult.Add(oValue)
                        Else
                            Logger.Debug("SplitIndex(TEXT2) was out of array bounds. Skipping.")
                        End If

                    Next

                Case Else
                    LogAndThrow($"Postprocessing type [{oType}] is not supported!")
            End Select

            Return oResult
        End Function

        Private Sub LoadIndexes(pProfileId As Integer)
            Logger.Debug("Start of Method [LoadIndexes]")

            LoadManualIndexes(pProfileId)
            LoadAutomaticIndexes(pProfileId)
            LoadPostProcessingSteps()
        End Sub

        Private Sub LoadAutomaticIndexes(pProfileId As Integer)
            Logger.Debug("Start of Method [LoadAutomaticIndexes]")

            Try
                ' Load automatic Indexes for this Import 
                Dim oAutomaticIndexes = GetDatatable.Run(
                    New GetDatatableFromCacheRequest With {
                        .DataTable = VIEW_INDEX_MANUAL,
                        .FilterExpression = $"DOK_ID = {pProfileId}"
                    })

                If oAutomaticIndexes.OK = False Then
                    LogAndThrow(oAutomaticIndexes.ErrorMessage)
                End If

                AutomaticIndexes = oAutomaticIndexes.Table
            Catch ex As Exception
                LogAndThrow(ex, "Error while automatic loading indexes!")
            End Try
        End Sub

        Private Sub LoadManualIndexes(pProfileId As Integer)
            Logger.Debug("Start of Method [LoadManualIndexes]")


            Try
                ' Load manual Indexes for this Import 
                Dim oManualIndexes = GetDatatable.Run(
                    New GetDatatableFromCacheRequest With {
                        .DataTable = VIEW_INDEX_MANUAL,
                        .FilterExpression = $"DOK_ID = {pProfileId}"
                    })

                If oManualIndexes.OK = False Then
                    LogAndThrow(oManualIndexes.ErrorMessage)
                End If

                ManualIndexes = oManualIndexes.Table

            Catch ex As Exception
                LogAndThrow(ex, "Error while loading indexes!")
            End Try
        End Sub

        Private Sub LoadPostProcessingSteps()
            Logger.Debug("Start of Method [LoadPostProcessingSteps]")

            Try
                ' Generate a string containing all index ids joined into a string
                Dim oIndexIdList As New List(Of Integer)
                For Each oRow As DataRow In ManualIndexes.Rows
                    oIndexIdList.Add(oRow.ItemEx(Of Integer)("GUID"))
                Next
                Dim oIndexIds As String = String.Join(",", oIndexIdList)

                ' Load all relevant postprocessing steps
                Dim oPostProcessingSteps = GetDatatable.Run(
                    New GetDatatableFromCacheRequest With {
                        .DataTable = TABLE_POST_PROCESSING,
                        .FilterExpression = $"IDXMAN_ID IN ({oIndexIds})"
                    })

                If oPostProcessingSteps.OK = False Then
                    LogAndThrow(oPostProcessingSteps.ErrorMessage)
                End If

                ManualIndexesPostProcessing = oPostProcessingSteps.Table
            Catch ex As Exception
                LogAndThrow(ex, "Error while loading post processing steps!")
            End Try
        End Sub
    End Class

End Namespace