Imports System
Imports Independentsoft.Email
Imports Independentsoft.Email.Smtp
Imports Independentsoft.Email.Mime

Imports DigitalData.Modules.Logging
Public Class Email
    Private _logger As DigitalData.Modules.Logging.Logger
    Private _logConfig As LogConfig
    Public Sub New(LogConfig As LogConfig)
        _logger = LogConfig.GetLogger()
        _logConfig = LogConfig
    End Sub
    Public Function NewEmail(mailto As String, mailSubject As String, mailBody As String,
                                                      mailfrom As String, mailsmtp As String, mailport As Integer, mailUser As String, mailPW As String,
                                                      AUTH_TYPE As String, SENDER_INSTANCE As String, Optional attment As String = "")
        Try
            _logger.Debug($"in NewEmail..")
            Dim oEmpfaenger As String()
            If mailto.Contains(";") Then
                oEmpfaenger = mailto.Split(";")
            Else
                ReDim Preserve oEmpfaenger(0)
                oEmpfaenger(0) = mailto
            End If
            Dim oError As Boolean = False
            'Für jeden Empfänger eine Neue Mail erzeugen
            For Each oMailempfaenger As String In oEmpfaenger
                _logger.Debug($"Working on email for {oMailempfaenger}..")
                Try
                    Dim oMessage As New Message()
                    oMessage.From = New Mailbox(mailfrom, mailfrom)
                    oMessage.[To].Add(New Mailbox(oMailempfaenger))
                    oMessage.Subject = mailSubject
                    _logger.Debug($"Message created..")
                    Dim oTextBodyPart As New BodyPart()
                    oTextBodyPart.ContentType = New ContentType("text", "html", "utf-8")

                    oTextBodyPart.ContentTransferEncoding = ContentTransferEncoding.QuotedPrintable
                    Dim formattedBody = "<font face=""Tahoma"">" & mailBody & "<br><br>>> Service: " & SENDER_INSTANCE & "<br>" &
                                               ">> DateTime: " & My.Computer.Clock.LocalTime.ToShortDateString & " " &
                                               My.Computer.Clock.LocalTime.ToLongTimeString & "</font>"
                    oTextBodyPart.Body = formattedBody
                    oMessage.BodyParts.Add(oTextBodyPart)
                    If attment <> String.Empty Then
                        If System.IO.File.Exists(attment) Then
                            Dim attachment1 As New Attachment(attment)
                            If attment.ToLower.EndsWith("pdf") Then
                                attachment1.ContentType = New ContentType("application", "pdf")
                            ElseIf attment.ToLower.EndsWith("jpg") Then
                                attachment1.ContentType = New ContentType("application", "jpg")
                            ElseIf attment.ToLower.EndsWith("docx") Then
                                attachment1.ContentType = New ContentType("application", "MS-word")
                            End If
                            oMessage.BodyParts.Add(attachment1)
                        Else
                            _logger.Warn($"Attachment {attment.ToString} is not existing!")
                        End If
                    End If
                    Dim oEmailCient As SmtpClient
                    Try
                        oEmailCient = New SmtpClient(mailsmtp, mailport)
                    Catch ex As Exception
                        _logger.Warn("clsEmail.Create Client: " & ex.Message)
                        oError = True
                        Continue For
                    End Try
                    Try
                        oEmailCient.Connect()
                    Catch ex As Exception
                        _logger.Warn("clsEmail.Client.Connect: " & ex.Message)
                        oError = True
                        ' Continue For
                    End Try
                    _logger.Debug("Connected to Client!")
                    If AUTH_TYPE = "SSL" Then
                        oEmailCient.EnableSsl = True
                        'client.ValidateRemoteCertificate = True
                        _logger.Debug("Authentification via SSL.")
                    ElseIf AUTH_TYPE = "TLS" Then
                        ' client.ValidateRemoteCertificate = False
                        oEmailCient.StartTls()
                        oEmailCient.EnableSsl = False
                        _logger.Info("Authentification via TLS. SSL disabled")
                    Else
                        oEmailCient.EnableSsl = False
                        _logger.Info("Authentification NONE. SSL disabled")
                    End If
                    Try
                        oEmailCient.Connect()
                    Catch ex As Exception
                        _logger.Warn("clsEmail.Client.Connect: " & ex.Message)
                        oError = True
                        ' Continue For
                    End Try
                    Try
                        If mailsmtp.Contains("office365.com") Then
                            oEmailCient.Login(mailUser, mailPW, AuthenticationType.None)
                        Else
                            oEmailCient.Login(mailUser, mailPW)
                        End If

                        _logger.Debug("Logged in!")
                    Catch ex As Exception
                        Try
                            If mailsmtp.Contains("office365.com") Then
                                oEmailCient.Login(mailUser, mailPW, AuthenticationType.Login)
                            Else
                                oEmailCient.Login(mailUser, mailPW, AuthenticationType.Anonymous)
                            End If

                        Catch ex1 As Exception
                            Try
                                oEmailCient.Login(mailUser, mailPW, AuthenticationType.Login)
                            Catch ex2 As Exception
                                _logger.Warn("clsEmail.Client.Login: " & ex.Message)
                                oError = True
                                oEmailCient.Disconnect()
                                Continue For
                            End Try
                        End Try
                    End Try
                    Try
                        oEmailCient.Send(oMessage)
                        _logger.Info("Message to " & oMailempfaenger & " has been send.")
                        oError = False
                    Catch ex As Exception
                        _logger.Warn("clsEmail.Client.Send: " & ex.Message)
                        oError = True
                        oEmailCient.Disconnect()
                        Continue For
                    End Try
                    oEmailCient.Disconnect()

                Catch ex As Exception
                    _logger.Error(ex)
                    oError = True
                End Try
            Next

            If oError = True Then
                Return False
            Else
                Return True
            End If
        Catch ex As Exception
            _logger.Error(ex)
            Return False
        End Try
    End Function
End Class