Imports System
Imports Independentsoft.Email
Imports Independentsoft.Email.Smtp
Imports Independentsoft.Email.Mime
Imports DigitalData.Modules.Logging

Public Class clsEmail
    Dim Logger As DigitalData.Modules.Logging.Logger
    Private Shared MailAktiv As Boolean = False
    Sub New(MyLogger As LogConfig)
        Logger = MyLogger.GetLogger()
    End Sub
    Public Function Testmail(ByVal mailSubject As String, ByVal mailBody As String, mailto As String,
                                                      mailfrom As String, mailsmtp As String, mailport As Integer, mailUser As String, mailPW As String,
                                                      AUTH_TYPE As String, Optional attment As String = "")
        Try
            Dim message As New Message()
            message.From = New Mailbox(mailUser, mailUser)
            message.To.Add(New Mailbox(mailto))
            message.Subject = mailSubject
            message.Body = mailBody
            message.ContentType = New ContentType("text", "plain", "iso-8859-1")
            message.ContentTransferEncoding = ContentTransferEncoding.QuotedPrintable

            Dim client As New SmtpClient(mailsmtp, mailport)
            client.EnableSsl = True
            client.ValidateRemoteCertificate = False

            client.Connect()
            client.Login(mailUser, mailPW)

            client.Send(message)
            client.Disconnect()
            Return True
        Catch ex As Exception
            MsgBox(ex.Message, MsgBoxStyle.Critical)
        End Try

    End Function

    Public Function Email_Send_Independentsoft(ByVal mailSubject As String, ByVal mailBody As String, mailto As String,
                                                      mailfrom As String, mailsmtp As String, mailport As Integer, mailUser As String, mailPW As String,
                                                      AUTH_TYPE As String, Optional attment As String = "")


        Try
            Logger.Debug($"in Email_Send_Independentsoft..")
            Dim empfaenger As String()
            If mailto.Contains(";") Then
                empfaenger = mailto.Split(";")
            Else
                ReDim Preserve empfaenger(0)
                empfaenger(0) = mailto
            End If
            Dim _error As Boolean = False
            'Für jeden Empfänger eine Neue Mail erzeugen
            For Each _mailempfaenger As String In empfaenger
                Logger.Debug($"Working on email for {_mailempfaenger}..")
                Try
                    Dim message As New Message()
                    message.From = New Mailbox(mailfrom, mailfrom)
                    message.[To].Add(New Mailbox(_mailempfaenger))
                    message.Subject = mailSubject
                    Logger.Debug($"Message created..")
                    Dim textBodyPart As New BodyPart()
                    textBodyPart.ContentType = New ContentType("text", "html", "utf-8")
                    textBodyPart.ContentTransferEncoding = ContentTransferEncoding.QuotedPrintable
                    textBodyPart.Body = mailBody
                    message.BodyParts.Add(textBodyPart)
                    If attment <> String.Empty Then
                        If System.IO.File.Exists(attment) Then
                            Dim attachment1 As New Attachment(attment)
                            If attment.ToLower.EndsWith("pdf") Then
                                attachment1.ContentType = New ContentType("application", "pdf")
                            ElseIf attment.ToLower.EndsWith("jpg") Then
                                attachment1.ContentType = New ContentType("application", "jpg")
                            ElseIf attment.ToLower.EndsWith("docx") Then
                                attachment1.ContentType = New ContentType("application", "MS-word")
                            End If
                            message.BodyParts.Add(attachment1)
                        Else
                            Logger.Warn($"Attachment {attment.ToString} is not existing!")
                        End If
                    End If
                    Dim client As SmtpClient
                    Try
                        client = New SmtpClient(mailsmtp, mailport)
                    Catch ex As Exception
                        Logger.Warn("clsEmail.Create Client: " & ex.Message)
                        _error = True
                        Continue For
                    End Try
                    'Try
                    '    client.Connect()
                    'Catch ex As Exception
                    '    Logger.Warn("clsEmail.Client.Connect: " & ex.Message)
                    '    _error = True
                    '    ' Continue For
                    'End Try

                    If AUTH_TYPE = "SSL" Then
                        client.EnableSsl = True
                        '    client.ValidateRemoteCertificate = True
                        Logger.Info("Authentification via SSL.")
                    ElseIf AUTH_TYPE = "TLS" Then
                        ' client.ValidateRemoteCertificate = False
                        client.StartTls()
                        client.EnableSsl = False
                        Logger.Info("Authentification via TLS. SSL disabled")
                    Else
                        client.EnableSsl = False
                        Logger.Info("Authentification NONE. SSL disabled")
                    End If
                    Try
                        client.Connect()
                        Logger.Info("Connected to Client!")
                    Catch ex As Exception
                        Logger.Warn("clsEmail.Client.Connect2: " & ex.Message)
                        _error = True
                        ' Continue For
                    End Try
                    Try
                        If mailsmtp.Contains("office365.com") Then
                            client.Login(mailUser, mailPW, AuthenticationType.None)
                        Else
                            client.Login(mailUser, mailPW)
                        End If

                        Logger.Info("Logged in!")
                    Catch ex As Exception
                        Try
                            If mailsmtp.Contains("office365.com") Then
                                client.Login(mailUser, mailPW, AuthenticationType.Login)
                            Else
                                client.Login(mailUser, mailPW, AuthenticationType.None)
                            End If

                        Catch ex1 As Exception
                            Try
                                client.Login(mailUser, mailPW, AuthenticationType.Login)
                            Catch ex2 As Exception
                                Logger.Warn("clsEmail.Client.Login: " & ex.Message)
                                _error = True
                                client.Disconnect()
                                Continue For
                            End Try
                        End Try
                    End Try
                    Try
                        client.Send(message)
                        Logger.Info("Message to " & _mailempfaenger & " has been send.")
                        _error = False
                    Catch ex As Exception
                        Logger.Warn("clsEmail.Client.Send: " & ex.Message)
                        Try
                            client.Login(mailUser, mailPW, AuthenticationType.Login)
                            client.Send(message)
                        Catch ex1 As Exception
                            Logger.Warn("clsEmail.Client.Send2: " & ex.Message)
                            _error = True
                            client.Disconnect()
                            Continue For
                        End Try



                    End Try
                    client.Disconnect()

                Catch ex As Exception
                    Logger.Error(ex)
                    _error = True
                End Try
            Next

            If _error = True Then
                Return False
            Else
                Return True
            End If
        Catch ex As Exception
            Logger.Error(ex)
            Return False
        End Try
    End Function

End Class