Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Filesystem
Imports DigitalData.Modules.Logging

Public Class frmConfigDatabase
    Private Const STRING_CONNECTION_SUCCESSFUL = "Die Verbindung wurde erfolgreich aufgebaut!" & vbNewLine & "Möchten Sie diese Verbindung nun in der Anwendung speichern?"

    Private Logger As Logger = My.LogConfig.GetLogger()

    Private Sub frmConfigDatabase_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim oConnectionString = My.SystemConfig.ConnectionString

        If Not oConnectionString = String.Empty Then
            Dim oBuilder = My.SystemConfig.GetConnectionStringBuilder(oConnectionString)

            If oBuilder Is Nothing Then
                MsgBox("Connection String ist ungültig!", MsgBoxStyle.Critical)
                Exit Sub
            End If

            If oConnectionString.Contains("Trusted") Then
                chkWinAuth.Checked = True
                txtConnectionString.Text = oConnectionString
            Else
                chkWinAuth.Checked = False
                txtConnectionString.Text = oConnectionString.Replace(oBuilder.Password, "XXXXXX")
                txtUserName.Text = oBuilder.UserID
            End If

            txtServerName.Text = oBuilder.DataSource
            cmbDatabase.Text = oBuilder.InitialCatalog
        End If
    End Sub

    Private Sub chkWinAuth_CheckedChanged(sender As Object, e As EventArgs) Handles chkWinAuth.CheckedChanged
        txtPassword.Enabled = Not chkWinAuth.Checked
        txtUserName.Enabled = Not chkWinAuth.Checked
    End Sub

    Private Sub cmbDatabase_Click(sender As Object, e As EventArgs) Handles cmbDatabase.Click
        Cursor = Cursors.WaitCursor

        Dim oConnectionString As String = GetConnectionString(False)
        Dim oDatabase As New MSSQLServer(My.LogConfig, oConnectionString)

        If oDatabase.DBInitialized = False Then
            MsgBox("Verbindung fehlgeschlagen!", MsgBoxStyle.Critical)
            Exit Sub
        End If

        Try
            Using oConnection = New SqlClient.SqlConnection(oConnectionString)
                oConnection.Open()
                Using cmd As New SqlClient.SqlCommand("sp_databases", oConnection)
                    Using dr As SqlClient.SqlDataReader = cmd.ExecuteReader
                        If dr.HasRows Then
                            cmbDatabase.Properties.Items.Clear()

                            Do While dr.Read
                                cmbDatabase.Properties.Items.Add(dr("Database_Name"))
                            Loop
                            cmbDatabase.ShowPopup()
                        Else
                            MsgBox("The standard-databases could not be retrieved. The default database will be set!" & vbNewLine & "Check rights in sql-server for user: " & Me.txtUserName.Text, MsgBoxStyle.Exclamation)
                        End If
                    End Using
                End Using
            End Using

        Catch ex As Exception
            Logger.Error(ex)
        End Try

        Cursor = Cursors.Default
    End Sub

    Private Function GetConnectionString(WithDatabase As Boolean) As String
        Dim oConnectionString As String

        If chkWinAuth.Checked Then
            oConnectionString = $"Data Source={txtServerName.Text};Trusted_Connection=True;"
        Else
            oConnectionString = $"Server={txtServerName.Text};User Id={txtUserName.Text};Password={txtPassword.Text};"
        End If

        If WithDatabase Then
            oConnectionString &= $"Database={cmbDatabase.Text};"
        End If

        Return oConnectionString
    End Function

    Private Sub btnTestConnection_Click(sender As Object, e As EventArgs) Handles btnTestConnection.Click
        Try
            Dim oConnectionString = GetConnectionString(True)

            Using oConnection As New SqlClient.SqlConnection(oConnectionString)
                oConnection.Open()
                oConnection.Close()
            End Using

            Dim oResult = MessageBox.Show(STRING_CONNECTION_SUCCESSFUL, Me.Text, MessageBoxButtons.YesNo, MessageBoxIcon.Question)

            If oResult = DialogResult.Yes Then
                Dim oCrypt As New EncryptionLegacy("!35452didalog=")
                Dim oEncryptedPassword = oCrypt.EncryptData(txtPassword.Text)
                Dim oEncryptedConnectionString = $"Server={txtServerName.Text};Database={cmbDatabase.Text};User Id={txtUserName.Text};Password={oEncryptedPassword};"

                My.SystemConfig.ConnectionString = oEncryptedConnectionString
                My.SystemConfigManager.Save()
            End If
        Catch ex As Exception
            Logger.Error(ex)
            MsgBox("Error while connecting to Database")
        End Try
    End Sub
End Class