Imports DigitalData.Modules.Logging
Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Base
Imports System.Data
Imports System.IO
Imports System.Data.SqlClient
Imports System.Collections.Generic
Imports System.Text.RegularExpressions

Namespace ZUGFeRD
    Public Class EmailFunctions
        Private ReadOnly _logConfig As LogConfig
        Private ReadOnly _logger As Logger
        Private ReadOnly _mssql As MSSQLServer

        Public Sub New(LogConfig As LogConfig, MSSQL As MSSQLServer)
            _logConfig = LogConfig
            _logger = _logConfig.GetLogger()
            _mssql = MSSQL
        End Sub

        ''' <summary>
        ''' Method to decide wether we use the old or the new
        ''' Rejection E-mail method.
        ''' 
        ''' TODO we have no information about the language of the receiver at the moment
        ''' </summary>
        ''' <param name="pMessageId">E-Mail Message ID</param>
        ''' <param name="pBodyText">Body Text</param>
        ''' <param name="pEmailData">Email Data object</param>
        ''' <param name="pSourceProcedure">Exception Title</param>
        ''' <param name="pEmailAccountId">Sending Profile from config</param>
        ''' <param name="pNamePortal">Name of the Portal from config</param>
        ''' <param name="pTemplateId">ID for E-Mail-Template from config</param>
        ''' <param name="pErrorCode">Error Code</param>
        Public Sub AddToEmailQueueMSSQL(pMessageId As String, pBodyText As String, pEmailData As EmailData, pSourceProcedure As String,
                                        pEmailAccountId As Integer, pNamePortal As String, pTemplateId As Integer, pErrorCode As ErrorCode)

            Dim useLegacyMethod = True
            Dim oErrorCode As String = String.Empty

            ' ErrorCode valid?
            If pErrorCode <> ErrorCode.Unknown Then
                Dim intCode As Integer = DirectCast(pErrorCode, Integer)
                oErrorCode = $"ZUGFERD_Rejection_{intCode}"

                Dim oSQL = $"SELECT COUNT(*) FROM TBDD_GUI_LANGUAGE_PHRASE WHERE TITLE = '{oErrorCode}'"
                If _mssql.GetScalarValue(oSQL) > 0 Then
                    useLegacyMethod = False
                Else
                    _logger.Warn($"Rejection reason [{oErrorCode}] not found in TBDD_GUI_LANGUAGE_PHRASE!")
                End If
            End If

            ' Gibt es das Template in TBDD_EMAIL_TEMPLATE?
            If useLegacyMethod = False AndAlso pTemplateId > 0 Then
                Try
                    Dim oSQL = $"SELECT COUNT(*) FROM TBDD_EMAIL_TEMPLATE WHERE GUID = {pTemplateId}"
                    If _mssql.GetScalarValue(oSQL) <= 0 Then
                        _logger.Warn($"EMAIL_TEMPLATE [{pTemplateId}] not found in TBDD_EMAIL_TEMPLATE!")
                        useLegacyMethod = True
                    End If
                Catch ex As Exception
                    _logger.Error(ex)
                    useLegacyMethod = True
                End Try

            Else
                _logger.Debug($"RejectionTemplateId not configured!")
                useLegacyMethod = True
            End If

            ' Check if Stored Procedure PRDD_SEND_REJECTION_MAIL exists
            If useLegacyMethod = False Then
                Try
                    Dim oSQL = $"SELECT COUNT(*) FROM sys.objects WHERE type = 'P' AND OBJECT_ID = OBJECT_ID('dbo.PRDD_SEND_REJECTION_MAIL')"
                    If _mssql.GetScalarValue(oSQL) <= 0 Then
                        _logger.Warn($"Procedure ['PRDD_SEND_REJECTION_MAIL'] not found in Database!")
                        useLegacyMethod = True
                    End If
                Catch ex As Exception
                    _logger.Error(ex)
                    useLegacyMethod = True
                End Try
            End If

            If useLegacyMethod = True Then
                _logger.Warn("New rejection mail logic is not configured correctly, use legacy logic instead!")
                AddToEmailQueueMSSQL(pMessageId, pBodyText, pEmailData, pSourceProcedure, pEmailAccountId, pNamePortal)
            Else
                _logger.Debug("New rejection mail logic is configured!")
                AddToEmailQueueMSSQL(pMessageId, pTemplateId, oErrorCode, pEmailAccountId)
            End If

        End Sub


        ''' <summary>
        ''' Function calls SP PRDD_SEND_REJECTION_MAIL
        ''' for sending rejection mail.
        ''' </summary>
        ''' <param name="pMessageId">E-Mail Message ID</param>
        ''' <param name="pTemplateId">GUID for TBDD_EMAIL_TEMPLATE from config</param>
        ''' <param name="pErrorCode">ErrorID (TBDD_GUI_LANGUAGE_PHRASE)</param>
        ''' <param name="pEmailAccountId">Sending profile from config</param>
        Private Sub AddToEmailQueueMSSQL(pMessageId As String, pTemplateId As Integer, pErrorCode As String, pEmailAccountId As Integer)

            Try
                Dim oExecute = $"EXECUTE dbo.PRDD_SEND_REJECTION_MAIL
                                    '{pMessageId}'
                                    , 0
                                    , {pEmailAccountId}
                                    , 'ZUGFeRD Service'
                                    , {pTemplateId}
                                    , '{pErrorCode}'
                                    , 77 
                                "
                If _mssql.ExecuteNonQuery(oExecute) = False Then
                    _logger.Warn("Could not execute PRDD_SEND_REJECTION_MAIL. See error log!")
                End If
            Catch ex As Exception
                _logger.Error(ex)
            End Try

        End Sub

        Private Sub AddToEmailQueueMSSQL(MessageId As String, BodyText As String, pEmailData As EmailData, SourceProcedure As String, pEmailAccountId As Integer, NamePortal As String)
            If pEmailData Is Nothing Then
                _logger.Warn("EmailData is empty. Email will not be sent!")
                Exit Sub
            End If

            Try
                Dim oJobId = RandomValue(1, 10000)
                Dim oReference = MessageId
                Dim oEmailTo = ""
                Dim oSubject = EmailStrings.EMAIL_SUBJECT_REJECTED.Replace(EmailStrings.constNAME_ZUGFERD_PORTAL, NamePortal)
                Dim oCreatedWho = "ZUGFeRD Service"

                Dim oMaskedBodyText = BodyText.Replace("'", "''")
                Dim oSubjectBodyText = String.Format(EmailStrings.EMAIL_SUBJECT_TEXT.Replace(EmailStrings.constNAME_ZUGFERD_PORTAL, NamePortal), pEmailData.Subject).Replace("'", "''")
                Dim oCompleteBodyText = oMaskedBodyText & oSubjectBodyText

                Dim oFinalBodyText = String.Format(EmailStrings.EMAIL_WRAPPING_TEXT.Replace(EmailStrings.constNAME_ZUGFERD_PORTAL, NamePortal), oCompleteBodyText)

                Dim oEmailAddress = pEmailData.From
                Dim oAttachmentPath = pEmailData.Attachment
                If oAttachmentPath <> String.Empty Then
                    _logger.Debug($"Attachment_String [{oAttachmentPath}]!")
                    If IO.File.Exists(oAttachmentPath) = False Then
                        _logger.Info($"Attachment.File [{oAttachmentPath}] is not existing!!!")
                    End If
                End If
                Dim oAttachmentPathEscaped = oAttachmentPath.Replace("'", "''")

                If IsNothing(oEmailAddress) OrElse String.IsNullOrWhiteSpace(oEmailAddress) Then
                    _logger.Warn("Could not find email-address for MessageId {0}", MessageId)
                    oEmailTo = String.Empty
                Else
                    oEmailTo = oEmailAddress
                End If

                _logger.Debug("Generated Email:")
                _logger.Debug("To: {0}", oEmailTo)
                _logger.Debug("Subject: {0}", oSubject)
                _logger.Debug("Body {0}", oFinalBodyText)
                Dim osql = $"Select MAX(GUID) FROM TBEMLP_HISTORY WHERE EMAIL_MSGID = '{MessageId}'"
                Dim oHistoryID = _mssql.GetScalarValue(osql)

                If IsNumeric(oHistoryID) Then
                    Dim oInsert = $"INSERT INTO [dbo].[TBEMLP_EMAIL_OUT] 
                       ([REMINDER_TYPE_ID]
                       ,[SENDING_PROFILE]
                       ,[REFERENCE_ID]
                       ,[REFERENCE_STRING]
                       ,[WF_ID]
                       ,[EMAIL_ADRESS]
                       ,[EMAIL_SUBJ]
                       ,[EMAIL_BODY]
                       ,[COMMENT]
                       ,[ADDED_WHO]
                        ,EMAIL_ATTMT1)
                 VALUES
                       (77
                       ,{pEmailAccountId}
                       ,{oHistoryID}
                       ,'{MessageId}'
                       ,77
                       ,'{oEmailTo}'
                       ,'{oSubject}'
                       ,'{oFinalBodyText}'
                       ,'{SourceProcedure}'
                       ,'{oCreatedWho}'
                       ,'{oAttachmentPathEscaped}')"
                    _mssql.ExecuteNonQuery(oInsert)
                Else
                    _logger.Warn("Could not get oHistoryID in AddToEmailQueueMSSQL!!")
                End If
            Catch ex As Exception
                _logger.Error(ex)
            End Try
        End Sub

        Public Function GetEmailDataForMessageId(MessageId As String) As EmailData
            Dim oSQL = $"SELECT EMAIL_FROM, EMAIL_SUBJECT FROM TBEMLP_HISTORY WHERE EMAIL_MSGID = '{MessageId}'"
            Try
                Dim oDatatable = _mssql.GetDatatable(oSQL)
                Dim oRow As DataRow

                If oDatatable.Rows.Count = 0 Then
                    _logger.Warn("Got no results for MessageId {0}", MessageId)
                    Return Nothing
                ElseIf oDatatable.Rows.Count > 1 Then
                    _logger.Warn("Got too many results for MessageId {0}. Using last row.", MessageId)
                End If

                _logger.Debug("Got Email Data for FileId {0}", MessageId)
                oRow = oDatatable.Rows.Item(oDatatable.Rows.Count - 1)

                Dim oFromDefault = String.Format("No Sender found for ({0})", MessageId)
                Dim oFrom = oRow.ItemEx("EMAIL_FROM", oFromDefault)

                Dim oSubjectDefault = String.Format("No Subject found for ({0})", MessageId)
                Dim oSubject = oRow.ItemEx("EMAIL_SUBJECT", oSubjectDefault)

                _logger.Info("Email Data for [{0}] fetched!", MessageId)
                Return New EmailData() With {
                    .From = oFrom,
                    .Subject = oSubject
                }

            Catch ex As Exception
                _logger.Warn("Could not fetch Email Data for FileId {0}", MessageId)
                Return Nothing
            End Try
        End Function

        Public Function GetOriginalEmailPath(OriginalEmailDirectory As String, MessageId As String) As String
            Dim oAttachmentFile = MessageId & ".eml"
            Dim oAttachmentPath = Path.Combine(OriginalEmailDirectory, oAttachmentFile)

            If File.Exists(oAttachmentPath) Then
                Return oAttachmentPath
            Else
                _logger.Warn("Email File {0} does not exist. Empty String will be returned.", oAttachmentPath)
                Return String.Empty
            End If
        End Function

        Private Function RandomValue(lowerBound As Integer, upperBound As Integer) As Integer
            Dim oRandomValue = CInt(Math.Floor((upperBound - lowerBound + 1) * Rnd())) + lowerBound
            Return oRandomValue
        End Function

        Public Function CreateBodyForMissingProperties(OriginalFilename As String, MissingProperties As List(Of String)) As String
            Dim oBody = String.Format(EmailStrings.EMAIL_MISSINGPROPERTIES_1, OriginalFilename)

            If MissingProperties.Count > 0 Then
                oBody &= $"{vbNewLine}{vbNewLine}"
                oBody &= EmailStrings.EMAIL_MISSINGPROPERTIES_2
                oBody &= $"{vbNewLine}{vbNewLine}"

                For Each prop In MissingProperties
                    oBody &= $"- {prop}"
                Next
            End If

            Return oBody
        End Function

        Public Function CreateBodyForUnhandledException(MessageId As String, Exception As Exception) As String
            Dim oBody = String.Format(EmailStrings.EMAIL_UNHANDLED_EXCEPTION, MessageId, Exception.Message, Exception.StackTrace)

            Return oBody
        End Function
    End Class
End Namespace