#Region "Includes"

Imports System.Xml
Imports System.Data.SqlClient
Imports Common.Settings

#End Region

Public Class Common
    Public Const SERVICE_DISPLAY_NAME As String = "EDKB10"
    Public Const DLL_DISPLAY_NAME As String = "EDKB10 Library"
    Private Const DSN_DECRYPT_PASSWORD As String = "HutterundMueller"

#Region "Members"

    Private m_DSN As String
    Private m_StartJobInterval As Integer
    Private m_WatchJobInterval As Integer
    Private m_MaximalStartDuration As Integer
    Private m_EventLogName As String
    Private m_LogTarget As LogTarget
    Private m_MailServer As String
    Private m_MailFrom As String
    Private m_MailServerAuthMethod As MailServerAuthMethod
    Private m_MailServerAuthUser As String
    Private m_MailServerAuthPassword As String
    Private m_MaxStarterNotifications As Integer
    Private m_MaxWatcherNotifications As Integer

    Private m_EventLog As EventLog
#End Region

#Region "Constructor"

    'Creates a new instance of this object
    Public Sub New()
        Try
            Dim reader As System.IO.StreamReader
            Dim s As String

            reader = System.IO.File.OpenText(AppDomain.CurrentDomain.BaseDirectory & "bms_conn.cfg")
            s = reader.ReadLine

            m_DSN = ZpCryptography.DsnCrypto.Decrypt(s, DSN_DECRYPT_PASSWORD)

            LoadSettings()

        Catch ex As Exception
            Throw ex
        End Try
    End Sub

#End Region

#Region "Private Methods"

    'Loads all settings from xml configuration file
    Private Sub LoadSettings()
        Try
            Dim xmlDoc As New XmlDocument

            xmlDoc.Load(AppDomain.CurrentDomain.BaseDirectory & "bms_settings.xml")

            m_MaximalStartDuration = CInt(xmlDoc.SelectSingleNode("/root/config/MaximumStartDuration").InnerText)
            m_StartJobInterval = CDbl(xmlDoc.SelectSingleNode("/root/config/StartJobInterval").InnerText) * 1000 * 60
            m_WatchJobInterval = CDbl(xmlDoc.SelectSingleNode("/root/config/WatchJobInterval").InnerText) * 1000 * 60

            m_EventLogName = xmlDoc.SelectSingleNode("/root/config/EventLogName").InnerText
            m_LogTarget = CType(CInt(xmlDoc.SelectSingleNode("/root/config/LogTarget").InnerText), LogTarget)

            m_MailServer = xmlDoc.SelectSingleNode("/root/config/MailServer").InnerText
            m_MailFrom = xmlDoc.SelectSingleNode("/root/config/MailFrom").InnerText

            m_MailServerAuthMethod = CType(xmlDoc.SelectSingleNode("/root/config/MailServerAuth/Method").InnerText, MailServerAuthMethod)
            m_MailServerAuthUser = xmlDoc.SelectSingleNode("/root/config/MailServerAuth/UserName").InnerText
            m_MailServerAuthPassword = xmlDoc.SelectSingleNode("/root/config/MailServerAuth/Password").InnerText

            m_MaxStarterNotifications = CInt(xmlDoc.SelectSingleNode("/root/config/MaxStarterNotifications").InnerText)
            m_MaxWatcherNotifications = CInt(xmlDoc.SelectSingleNode("/root/config/MaxWatcherNotifications").InnerText)

            m_EventLog = New EventLog(m_EventLogName)
            m_EventLog.Source = "Service"
        Catch ex As Exception
            Throw ex
        End Try
    End Sub

#End Region


#Region "Public Methods"

    'Logs an exception
    Public Sub Log(ByVal source As String, ByVal message As String)
        Try
            Log(source, message, EventLogEntryType.Information)
        Catch ex As Exception
            Log(SERVICE_DISPLAY_NAME, "Catastrophical error while writing to EventLog " + m_LogTarget.ToString() + Environment.NewLine + ex.Message + Environment.NewLine + ex.StackTrace, EventLogEntryType.Error, LogTarget.SystemEventLog)
        End Try
    End Sub

    'Logs an exception
    Public Sub Log(ByVal ex As Exception)
        Try
            Log(ex.Source, ex.Message, EventLogEntryType.Error)
        Catch exNew As Exception
            Log(SERVICE_DISPLAY_NAME, "Catastrophical error while writing to EventLog " + m_LogTarget.ToString() + Environment.NewLine + exNew.Message + Environment.NewLine + exNew.StackTrace, EventLogEntryType.Error, LogTarget.SystemEventLog)
        End Try
    End Sub

    'Logs an message to the system eventlog or database event log
    Public Sub Log(ByVal source As String, ByVal message As String, ByVal eventLogType As EventLogEntryType)
        Try
            Log(source, message, eventLogType, m_LogTarget)
            'MsgBox(CInt("23s45")) force crash 4 debug
        Catch ex As Exception
            Log(SERVICE_DISPLAY_NAME, "Catastrophical error while writing to EventLog " + m_LogTarget.ToString() + Environment.NewLine + ex.Message + Environment.NewLine + ex.StackTrace, EventLogEntryType.Error, LogTarget.SystemEventLog)
        End Try
    End Sub

    'Logs an event
    Public Sub Log(ByVal source As String, ByVal message As String, ByVal eventLogType As EventLogEntryType, ByVal logTarget As LogTarget)
        Try
            Select Case logTarget
                Case logTarget.SystemEventLog
                    If Not System.Diagnostics.EventLog.SourceExists(m_EventLogName) Then
                        System.Diagnostics.EventLog.CreateEventSource(m_EventLogName, m_EventLogName)
                    End If

                    'System.Diagnostics.EventLog.WriteEntry(m_EventLogName, message, eventLogType)
                    EventLog.WriteEntry(m_EventLogName, message, eventLogType)
                Case logTarget.Database
                    Dim sqlCon As New SqlConnection(m_DSN)
                    Dim sqlCom As New SqlCommand

                    sqlCon.Open()

                    sqlCom.CommandType = CommandType.StoredProcedure
                    sqlCom.Connection = sqlCon
                    sqlCom.CommandText = "CreateEventLogEntry"

                    sqlCom.Parameters.Add(New SqlParameter("@TypeId", CInt(eventLogType)))
                    sqlCom.Parameters.Add(New SqlParameter("@Source", source))
                    sqlCom.Parameters.Add(New SqlParameter("@Computer", Environment.MachineName))
                    sqlCom.Parameters.Add(New SqlParameter("@EventDesc", message))
                    sqlCom.ExecuteNonQuery()

                    sqlCon.Close()
            End Select
        Catch ex As Exception
            m_EventLog.WriteEntry("EXCEPTION ON Common.Log: " + ex.Message, EventLogEntryType.Error)
            'Log(source, "EXCEPTION ON Common.Log: " + ex.Message + Environment.NewLine + Environment.NewLine + message, eventLogType, logTarget.SystemEventLog)
            'Log(SERVICE_DISPLAY_NAME, "EXCEPTION ON Common.Log: " + ex.Message + Environment.NewLine + ex.StackTrace, EventLogEntryType.Error, logTarget.SystemEventLog)
        End Try
    End Sub

    'Sends a mail using sql server and cdo object
    Public Sub SendMail(ByVal receiver As String, ByVal subject As String, ByVal message As String)
        Dim sqlConn As New SqlConnection(m_DSN)
        Try
            Dim sqlCom As New SqlCommand
            Dim da As New SqlDataAdapter
            Dim ds As New DataSet

            sqlConn.Open()

            sqlCom.CommandType = CommandType.StoredProcedure
            sqlCom.Connection = sqlConn
            sqlCom.CommandText = "SendMailMessage"

            sqlCom.Parameters.Add(New SqlParameter("@MailServer", m_MailServer))
            sqlCom.Parameters.Add(New SqlParameter("@From", m_MailFrom))
            sqlCom.Parameters.Add(New SqlParameter("@AuthMethod", m_MailServerAuthMethod.ToString()))
            sqlCom.Parameters.Add(New SqlParameter("@Username", m_MailServerAuthUser))
            sqlCom.Parameters.Add(New SqlParameter("@Password", m_MailServerAuthPassword))
            sqlCom.Parameters.Add(New SqlParameter("@To", receiver))
            sqlCom.Parameters.Add(New SqlParameter("@Subject", subject))
            sqlCom.Parameters.Add(New SqlParameter("@Body", message))

            da.SelectCommand = sqlCom
            da.Fill(ds)

            sqlConn.Close()
            If ds.Tables.Count > 0 Then
                If ds.Tables(0).Rows.Count > 0 Then
                    Throw New Exception("Mail konnte nicht versendet werden. " + ds.Tables(0).Rows(0)(0).ToString() + " " + ds.Tables(0).Rows(0)(1).ToString() + " " + ds.Tables(0).Rows(0)(2).ToString())
                End If
            End If
        Catch ex As Exception
            If sqlConn.State = ConnectionState.Open Then
                sqlConn.Close()
            End If
            Throw ex
        End Try
    End Sub

#End Region

#Region "Properties"
    Public ReadOnly Property StartJobInterval() As Integer
        Get
            Return m_StartJobInterval
        End Get
    End Property

    Public ReadOnly Property WatchJobInterval() As Integer
        Get
            Return m_WatchJobInterval
        End Get
    End Property

    Public ReadOnly Property MaximalStartDuration() As Integer
        Get
            Return m_MaximalStartDuration
        End Get
    End Property

    Public ReadOnly Property DSN() As String
        Get
            Return m_DSN
        End Get
    End Property

    Public ReadOnly Property EventLogName() As String
        Get
            Return m_EventLogName
        End Get
    End Property

    Public ReadOnly Property MailServer() As String
        Get
            Return m_EventLogName
        End Get
    End Property

    Public ReadOnly Property MailFrom() As String
        Get
            Return m_EventLogName
        End Get
    End Property

    Public ReadOnly Property MaxStarterNotifications() As String
        Get
            Return m_MaxStarterNotifications
        End Get
    End Property

    Public ReadOnly Property MaxWatcherNotifications() As String
        Get
            Return m_MaxWatcherNotifications
        End Get
    End Property
#End Region

#Region "Enums"

    Enum JournalEntryType
        Information = 1
        Warning = 2
        [Error] = 3
    End Enum

    Enum JobType
        WatchJob = 1
        StartJob = 2
    End Enum

    Enum JobStartType
        Executable = 1
        WindowsService = 2
        SqlQuery = 3
    End Enum

    Enum StartParameterType
        Username = 1
        Password = 2
        ServerName = 3
        FilePath = 4
        ServiceName = 5
        ConnectionString = 6
        SQLQuery = 7
    End Enum

    Enum LastRun
        Start = 1
        [End] = 2
    End Enum

    Enum NotificationType
        Mail = 1
        File = 2
    End Enum

    Enum LogTarget
        SystemEventLog = 1
        Database = 2
    End Enum

    Enum MailServerAuthMethod
        cdoAnonymous = 0
        cdoBasic = 1
    End Enum
#End Region

End Class