Imports System.IO
Imports System.Xml
Imports System.Xml.Serialization
Imports System.Xml.XPath
Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Logging
Imports DigitalData.Modules.Language
Imports EDIDocumentImport.DocumentInfo
Imports System.Text.RegularExpressions
Imports EDIDocumentImport.WinLineInfo

Public Class DocumentLoader
    Inherits Base

    Public Config As Config
    Private Database As MSSQLServer
    Private Winline As WinLineInfo

    Public Files As New List(Of Document)

    Public Sub New(pLogConfig As LogConfig, pConfig As Config, pDatabase As MSSQLServer, pWinline As WinLineInfo)
        MyBase.New(pLogConfig, pLogConfig.GetLogger())
        Config = pConfig
        Database = pDatabase
        Winline = pWinline
    End Sub

    Public Function LoadFiles() As Boolean
        If Config.InputDirectory = String.Empty Then
            Throw New ArgumentNullException("InputDirectory")
        End If

        Logger.Info("Loading files from directory [{0}]", Config.InputDirectory)

        Try
            Dim oDirectory As New DirectoryInfo(Config.InputDirectory)
            Dim oFiles = oDirectory.GetFiles()

            Logger.Debug("Found [{0}] files in directory [{1}]", oFiles.Count, oDirectory)

            Files = oFiles.
                Select(AddressOf WrapFileInfo).
                Select(AddressOf LoadDocumentData).
                Select(Function(oDocument)
                           Return MatchDataFromWinLine(oDocument, Winline.Mandators)
                       End Function).
                ToList()

            Return True

        Catch ex As Exception
            Logger.Error(ex)
            Throw New IO.IOException($"Could not load files from directory {Config.InputDirectory}", ex)

        End Try
    End Function

    Private Function FindMatchingMandatorFromOrder(pData As Orders.Input.MESOWebService) As Mandator
        Dim oPositions As List(Of Orders.Input.MESOWebServiceEXIMVRG_ordersT026) = pData.Items.
            Where(Function(i) TypeOf i Is Orders.Input.MESOWebServiceEXIMVRG_ordersT026).
            Select(Of Orders.Input.MESOWebServiceEXIMVRG_ordersT026)(Function(i) i).
            ToList()
        Dim oYear = Winline.GetWinLineYear()
        Dim oMandatorId As String = String.Empty
        Dim oWhitelistedMandators = Winline.Mandators.
            Where(Function(m) m.IsWhitelisted = True).
            ToList()

        For Each oPos In oPositions
            For Each oMandator In oWhitelistedMandators
                Dim oSQL As String = $"
                    SELECT 
                    [c011], -- Artikelnummer 
                    [c003], -- Artikelbezeichnung
                    [c075], -- EAN-Nummer 
                    [c123]  -- Ersatzartikelnummer
                    FROM [{oMandator.Database}].[dbo].[v021]
                    WHERE [c075] = '{oPos.Artikelnummer}'
                    AND [mesocomp] = '{oMandator.Id}' AND [mesoyear] = {oYear}"
                Dim oTable As DataTable = Database.GetDatatable(oSQL)

                ' EAN not found in this Mandator, continue to next one
                If oTable.Rows.Count = 0 Then
                    Logger.Debug("EAN [{0}] was not found in Mandator: [{1}]", oPos.Artikelnummer, oMandator.Id)
                    Continue For
                End If

                ' Duplicate EAN, exit and do nothing about this manda
                If oTable.Rows.Count > 1 Then
                    Logger.Warn("EAN [{0}] was found more than once. Skipping Mandator [{1}]", oPos.Artikelnummer, oMandator.Id)
                    Exit For
                End If

                Dim oRow As DataRow = oTable.Rows.Item(0)
                Dim oArticleNumber As String = Utils.NotNull(oRow.Item(WinLineInfo.V21_ARTICLENUMBER), String.Empty)

                ' EAN was found, now we need to check it against the Regex of the current Mandantor, if one exists
                If oMandator.Regex <> String.Empty Then
                    Try
                        Dim oRegex As New Regex(oMandator.Regex)
                        Dim oMatch = oRegex.Match(oArticleNumber)

                        ' If ArticleNumber matches the regex, we assign it and exit
                        If oMatch.Success Then
                            oMandatorId = oMandator.Id
                            Exit For
                        Else
                            ' If it does not match, continue to the next mandator
                        End If
                    Catch ex As Exception
                        Logger.Error(ex)
                        Logger.Warn("Regex [{0}] could not be parsed. Skipping.", oMandator.Regex)
                    End Try
                Else
                    ' If no regex was found, we assume the number matches
                    oMandatorId = oMandator.Id
                End If
            Next
        Next

        If oMandatorId = String.Empty Then
            Return Nothing
        Else
            Return oWhitelistedMandators.
                Where(Function(m) m.Id = oMandatorId).
                Take(1).
                SingleOrDefault()
        End If
    End Function

    Private Function MatchDataFromWinLine(pDocument As DocumentInfo.Document, pMandators As List(Of WinLineInfo.Mandator)) As DocumentInfo.Document
        Dim oMandators As List(Of WinLineInfo.Mandator) = pMandators.
            Where(Function(m) m.IsWhitelisted = True).
            OrderBy(Function(m) m.Order).
            ToList()

        If TypeOf pDocument.Data Is Orders.Input.MESOWebService Then
            Dim oMandator = FindMatchingMandatorFromOrder(pDocument.Data)
            Dim oData As Orders.Input.MESOWebService = MatchOrderData(pDocument.Data, oMandator)

            pDocument.Mandator = oMandator
            pDocument.Data = oData
        End If

        Return pDocument
    End Function

    Private Function MatchOrderData(pData As Orders.Input.MESOWebService, pMandator As WinLineInfo.Mandator) As Orders.Input.MESOWebService
        Dim oYear = Winline.GetWinLineYear()

        If pMandator Is Nothing Then
            Return pData
        End If

        Dim oHead As Orders.Input.MESOWebServiceEXIMVRG_ordersT025 = pData.Items.
            Where(Function(h) TypeOf h Is Orders.Input.MESOWebServiceEXIMVRG_ordersT025).
            SetValue(Sub(h)
                         Dim oAccountNumber = Winline.TryGetAccountNumber(h.Fakt_Kontonummer, pMandator)
                         If oAccountNumber IsNot Nothing Then
                             h.Fakt_Kontonummer = oAccountNumber
                         End If

                         Dim oAccountNumber2 = Winline.TryGetAccountNumber(h.Lief_Kontonummer, pMandator)
                         If oAccountNumber2 IsNot Nothing Then
                             h.Lief_Kontonummer = oAccountNumber2
                         End If
                     End Sub).
            FirstOrDefault()

        Dim oPositions As List(Of Orders.Input.MESOWebServiceEXIMVRG_ordersT026) = pData.Items.
            Where(Function(p) TypeOf p Is Orders.Input.MESOWebServiceEXIMVRG_ordersT026).
            SetValue(Sub(p)
                         Dim oArticleNumber = Winline.TryGetArticleNumber(p.Artikelnummer, pMandator)
                         If oArticleNumber IsNot Nothing Then
                             p.Artikelnummer = oArticleNumber
                         End If
                     End Sub).
            Select(Of Orders.Input.MESOWebServiceEXIMVRG_ordersT026)(Function(i) i).
            ToList()


        pData.Items = New List(Of Object) From {oHead}.
            Concat(oPositions).
            ToArray()


        'Dim oAccountNumber = Winline.TryGetAccountNumber(oHead.Fakt_Kontonummer, oMandator)
        'If oAccountNumber IsNot Nothing Then
        '    oHead.Fakt_Kontonummer = oAccountNumber
        'End If

        'Dim oAccountNumber2 = Winline.TryGetAccountNumber(oHead.Lief_Kontonummer, oMandator)
        'If oAccountNumber2 IsNot Nothing Then
        '    oHead.Lief_Kontonummer = oAccountNumber2
        'End If

        'For Each oPos In oPositions
        '    Dim oArticleNumber = Winline.TryGetArticleNumber(oPos.Artikelnummer, oMandator)
        '    If oArticleNumber Then
        '        oPos.Artikelnummer = oArticleNumber
        '    End If


        'Next

        Return pData
    End Function




    Private Function WrapFileInfo(pFileInfo As FileInfo) As Document
        Return New Document With {.File = pFileInfo}
    End Function
    Private Function LoadDocumentData(pDocument As Document) As Document
        Using oFileStream As New FileStream(pDocument.FullName, FileMode.Open, FileAccess.Read, FileShare.Read)
            Try
                Dim oXmlDocument = New XPathDocument(oFileStream)
                Dim oNavigator = oXmlDocument.CreateNavigator()
                Dim oTemplateName = GetTemplateName(oNavigator)
                Dim oDocumentType = GetDocumentTypeFromTemplateName(oTemplateName)
                Dim oSchemaType = GetDocumentSchemaFromDocumentType(oDocumentType)

                ' Read data the first time, working copy
                Using oReader = oNavigator.ReadSubtree()
                    Dim oSerializer = GetSerializer(oSchemaType)
                    pDocument.Data = oSerializer.Deserialize(oReader)

                End Using

                ' Read data the second time, archive copy
                Using oReader = oNavigator.ReadSubtree()
                    Dim oSerializer = GetSerializer(oSchemaType)
                    pDocument.DataOriginal = oSerializer.Deserialize(oReader)

                End Using

                pDocument.Type = oDocumentType
                Return pDocument
            Catch ex As Exception
                Logger.Error(ex)

                Dim oException As Exception = ex
                If ex.InnerException IsNot Nothing Then
                    oException = ex.InnerException
                End If

                Throw oException
            End Try
        End Using
    End Function


    Private Function GetSerializer(pSchemaType As Type) As XmlSerializer
        Dim oSerializer As New XmlSerializer(pSchemaType)


        AddHandler oSerializer.UnknownAttribute, Sub(sender As Object, e As XmlAttributeEventArgs)
                                                     Logger.Debug("Unknown Attribute: {0}", e.Attr)
                                                 End Sub

        AddHandler oSerializer.UnknownElement, Sub(sender As Object, e As XmlElementEventArgs)
                                                   Logger.Debug("Unknown Element: {0}", e.Element)
                                               End Sub

        AddHandler oSerializer.UnknownNode, Sub(sender As Object, e As XmlNodeEventArgs)
                                                Logger.Debug("Unknown Node: {0}", e.Name)
                                            End Sub

        AddHandler oSerializer.UnreferencedObject, Sub(sender As Object, e As UnreferencedObjectEventArgs)
                                                       Logger.Debug("Unreferenced Object: {0}", e.UnreferencedId)
                                                   End Sub

        Return oSerializer
    End Function

    Private Function GetTemplateName(pDocument As XPathNavigator) As String
        Dim oTemplateName = pDocument.
            SelectSingleNode("//MESOWebService").
            GetAttribute("Template", "")

        Return oTemplateName
    End Function
End Class