Imports System.Data.SqlClient
Imports System.Data.Odbc
Imports Microsoft.Win32
Imports DigitalData.Modules.Database.Constants
Imports DigitalData.Modules

Public Class frmConnection
    Private Sub TBDD_CONNECTIONBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs)
        Validate()
        TBDD_CONNECTIONBindingSource.EndEdit()
        TableAdapterManager.UpdateAll(MyDataset)
    End Sub

    Private Sub frmConnection_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Load_Connections()

        Dim oSystemConnections = LoadOdbcConnections(Registry.LocalMachine)
        Dim oUserConnections = LoadOdbcConnections(Registry.CurrentUser)

        For Each oDSN In oSystemConnections
            ODBCServerTextBox.Items.Add(oDSN)
        Next

        For Each oDSN In oUserConnections
            ODBCServerTextBox.Items.Add(oDSN)
        Next
    End Sub

    Private Sub Load_Connections()
        Try
            TBDD_CONNECTIONTableAdapter.Connection.ConnectionString = MyConnectionString
            TBDD_CONNECTIONTableAdapter.Fill(MyDataset.TBDD_CONNECTION)
        Catch ex As Exception
            _Logger.Error(ex)
            MsgBox("Fehler beim Laden der Verbindungen: " & vbNewLine & ex.Message, MsgBoxStyle.Critical, Text)
        End Try
    End Sub

    Private Function LoadOdbcConnections(Root As RegistryKey) As List(Of String)
        Dim oConnections As New List(Of String)

        Try
            Dim oPath As String = "SOFTWARE\\ODBC\\ODBC.INI\\ODBC Data Sources"
            Dim oKey As RegistryKey = Root.OpenSubKey(oPath, False)

            If oKey Is Nothing Then
                Return oConnections
            End If

            For Each oName In oKey.GetValueNames
                oConnections.Add(oName)
            Next

            Return oConnections
        Catch ex As Exception
            _Logger.Error(ex)
            Return oConnections
        End Try
    End Function



    Private Sub TBDD_CONNECTIONBindingSource_AddingNew(sender As Object, e As System.ComponentModel.AddingNewEventArgs) Handles TBDD_CONNECTIONBindingSource.AddingNew
        MyDataset.TBDD_CONNECTION.AKTIVColumn.DefaultValue = True
        MyDataset.TBDD_CONNECTION.ERSTELLTWERColumn.DefaultValue = Environment.UserName
        MyDataset.TBDD_CONNECTION.SQL_PROVIDERColumn.DefaultValue = "MS-SQL"
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs)
        ConnectionTest(SQL_PROVIDERComboBox.Text, chkWinAuth.Checked, SERVERTextBox.Text, USERNAMETextBox.Text, PASSWORDTextBox.Text, DATENBANKComboBox.Text)
    End Sub

    Private Sub ConnectionTest(ConnectionType As String, WinAuth As Boolean, Server As String, UserId As String, Password As String, Database As String)
        Dim oConnectionString As String = String.Empty

        Select Case ConnectionType
            Case PROVIDER_MSSQL
                If WinAuth Then
                    oConnectionString = $"Data Source={Server};Initial Catalog={Database};Trusted_Connection=True;"
                Else
                    oConnectionString = $"Server={Server};Database={Database};User Id={UserId};Password={Password};"
                End If

                Using oConnection As New SqlConnection(oConnectionString)
                    Try
                        oConnection.Open()
                        MsgBox("Die Verbindung wurde erfolgreich aufgebaut!", MsgBoxStyle.Information, Text)
                    Catch ex As Exception
                        _Logger.Error(ex)
                        MsgBox("Fehler beim Verbindungsaufbau (MSSQL): " & vbNewLine & ex.Message, MsgBoxStyle.Exclamation, Text)
                    End Try
                End Using
            Case PROVIDER_ORACLE
                Try
                    oConnectionString = $"Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST={Server})(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME={Database})));User Id={UserId};Password={Password};"
                    Dim oOracle As New Database.Oracle(_LogConfig, oConnectionString)

                    If oOracle.DBInitialized Then
                        MsgBox("Die Verbindung wurde erfolgreich aufgebaut!", MsgBoxStyle.Information, Text)
                    Else
                        MsgBox("Fehler beim Verbindungsaufbau (ORACLE): Fehler im Log", MsgBoxStyle.Critical, Text)
                    End If
                Catch ex As Exception
                    _Logger.Error(ex)
                    MsgBox("Fehler beim Verbindungsaufbau (ORACLE): " & vbNewLine & ex.Message, MsgBoxStyle.Critical, Text)
                End Try
            Case PROVIDER_ODBC
                Try
                    oConnectionString = $"DSN={Server};UID={UserId};PWD={Password}"

                    Using oConnection As New OdbcConnection(oConnectionString)
                        oConnection.Open()
                        MsgBox("Die Verbindung wurde erfolgreich aufgebaut!", MsgBoxStyle.Information, Text)
                    End Using
                Catch ex As Exception
                    _Logger.Error(ex)
                    MsgBox("Fehler beim Verbindungsaufbau (ODBC): " & vbNewLine & ex.Message, MsgBoxStyle.Critical, Text)
                End Try
        End Select


    End Sub

    Private Sub DATENBANKComboBox_Click(sender As Object, e As EventArgs) Handles DATENBANKComboBox.Click
        Cursor = Cursors.WaitCursor
        Dim oConnectionBuilder As New SqlConnectionStringBuilder

        If SERVERTextBox.Text = String.Empty Then
            MsgBox("Bitte geben sie einen Server an!")
            Exit Sub
        End If

        If SQL_PROVIDERComboBox.Text = PROVIDER_ORACLE Then
            Exit Sub
        End If

        If chkWinAuth.Checked Then
            oConnectionBuilder.DataSource = SERVERTextBox.Text
            oConnectionBuilder.IntegratedSecurity = True
        Else
            If USERNAMETextBox.Text = String.Empty Or PASSWORDTextBox.Text = String.Empty Then
                MsgBox("Bitte geben sie Benutzer und Passwort an!", MsgBoxStyle.Exclamation, Text)
                Exit Sub
            End If

            oConnectionBuilder.DataSource = SERVERTextBox.Text
            oConnectionBuilder.IntegratedSecurity = False
            oConnectionBuilder.UserID = USERNAMETextBox.Text
            oConnectionBuilder.Password = PASSWORDTextBox.Text
        End If

        Try
            Using oConnection As New SqlConnection(oConnectionBuilder.ToString)
                oConnection.Open()

                Using oCmd As New SqlCommand("sp_databases", oConnection) With {.CommandType = CommandType.StoredProcedure}
                    Using oReader As SqlDataReader = oCmd.ExecuteReader
                        If oReader.HasRows Then
                            DATENBANKComboBox.Items.Clear()
                            Do While oReader.Read()
                                DATENBANKComboBox.Items.Add(oReader.Item("Database_Name"))
                            Loop
                            DATENBANKComboBox.DroppedDown = True
                        Else
                            MsgBox("The standard-databases could not be retrieved." & vbNewLine & "Check rights in sql-server for user", MsgBoxStyle.Exclamation)
                        End If
                    End Using
                End Using
            End Using
        Catch ex As Exception
            _Logger.Error(ex)
            MsgBox("Error while loading Databases:" & vbCrLf & ex.Message, MsgBoxStyle.Critical, Text)
        Finally
            Cursor = Cursors.Default
        End Try
    End Sub

    Private Sub chkWinAuth_CheckedChanged(sender As Object, e As EventArgs) Handles chkWinAuth.CheckedChanged
        If chkWinAuth.Checked Then
            USERNAMETextBox.Enabled = False
            USERNAMETextBox.Text = "WINAUTH"
            PASSWORDTextBox.Enabled = False
            PASSWORDTextBox.Text = ""
        Else
            USERNAMETextBox.Enabled = True
            USERNAMETextBox.Text = ""
            PASSWORDTextBox.Enabled = True
            PASSWORDTextBox.Text = ""
        End If
    End Sub

    Private Sub BarButtonItem1_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonAdd.ItemClick
        TBDD_CONNECTIONBindingSource.AddNew()
    End Sub

    Private Sub BarButtonItem2_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonDelete.ItemClick
        Try
            If GUIDTextBox.Text <> String.Empty Then
                Dim oSQL = $"SELECT dbo.FNCW_GET_SEARCH_COUNT_FOR_CONNECTION({GUIDTextBox.Text})"
                Dim oCount = MyDB_DDECM.GetScalarValue(oSQL)

                If oCount IsNot Nothing AndAlso oCount = 0 Then
                    Dim oResult As MsgBoxResult = MsgBox("Wollen Sie die Verbindung wirklich löschen?", MsgBoxStyle.YesNo, Text)
                    If oResult = MsgBoxResult.Yes Then
                        TBDD_CONNECTIONTableAdapter.Delete(GUIDTextBox.Text)
                    End If
                Else
                    MsgBox($"Die Verbindung '{BEZEICHNUNGTextBox.Text}' kann nicht gelöscht werden, da sie von mindestens einer Suche verwendet wird!", MsgBoxStyle.Exclamation, Text)
                End If
            End If
        Catch ex As Exception
            _Logger.Error(ex)
            MsgBox("Fehler beim Löschen der Verbindung: " & vbNewLine & ex.Message, MsgBoxStyle.Critical, Text)
        End Try
    End Sub

    Private Sub BarButtonItem3_ItemClick(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonSave.ItemClick
        Validate()
        TBDD_CONNECTIONBindingSource.EndEdit()
        TableAdapterManager.UpdateAll(MyDataset)
    End Sub

    Private Sub BarButtonItem1_ItemClick_1(sender As Object, e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItem1.ItemClick
        ConnectionTest(SQL_PROVIDERComboBox.Text, chkWinAuth.Checked, SERVERTextBox.Text, USERNAMETextBox.Text, PASSWORDTextBox.Text, DATENBANKComboBox.Text)
    End Sub

    Private Sub SQL_PROVIDERComboBox_SelectedValueChanged(sender As Object, e As EventArgs) Handles SQL_PROVIDERComboBox.SelectedValueChanged
        If SQL_PROVIDERComboBox.Text = PROVIDER_ODBC Then
            DATENBANKComboBox.Enabled = False
            ODBCServerTextBox.Enabled = True
            chkWinAuth.Enabled = False
        Else
            DATENBANKComboBox.Enabled = True
            ODBCServerTextBox.Enabled = False
            chkWinAuth.Enabled = True
        End If
    End Sub

    Private Sub ODBCServerTextBox_SelectedValueChanged(sender As Object, e As EventArgs) Handles ODBCServerTextBox.SelectedValueChanged
        If ODBCServerTextBox.Text <> String.Empty Then
            SERVERTextBox.Text = ODBCServerTextBox.Text
            BEZEICHNUNGTextBox.Text = ODBCServerTextBox.Text
        End If
    End Sub
End Class