Imports System.Data.SqlClient
Imports System.Data
Imports System.Security.Cryptography

Partial Class login_FLEX
    Inherits System.Web.UI.Page

    Dim Customer_ID As String = String.Empty
    Dim UserNaMe As String = String.Empty
    Dim passw As String = String.Empty
    Dim USERID As String = String.Empty
    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
        VERAG_VARIABLES.initerrorcount()
        If Page.IsPostBack = True Then
            Page.MaintainScrollPositionOnPostBack = True
        Else
            Page.MaintainScrollPositionOnPostBack = False
        End If
    End Sub
    Protected Sub ValidateUser(sender As Object, e As EventArgs)

        ' cDBFunctions.GetNewOpenConnection()
        Dim ConnectionString = ""
        If HttpContext.Current.Request.ServerVariables("SERVER_NAME") = "localhost" Then
            VERAG_PROG_ALLGEMEIN.cAllgemein.TESTSYSTEM = True
            'ConnectionString = "Server=DEVELOPER\DEVSQL;Database=VERAG_HOMEPAGE;Uid=sa;Pwd=BmWr501956"
            ConnectionString = "Server=DEVELOPER\DEVSQL;Database=VERAG_HOMEPAGE;Uid=AppUser;Pwd=yp/THDd?xM+pZ$;"
        Else
            VERAG_PROG_ALLGEMEIN.cAllgemein.TESTSYSTEM = False
            ConnectionString = "Server=DEVELOPER.verag.ost.dmn\DEVSQL;Database=VERAG_HOMEPAGE;Uid=AppUser;Pwd=yp/THDd?xM+pZ$;"
            'ConnectionString = "Server=db593295684.db.1and1.com;Database=db593295684;Uid=dbo593295684;Pwd=atilla#2;"
        End If

        Dim tb As TextBox = Login1.FindControl("txt_CustomerID")
        Dim tb_M As TextBox = Login2.FindControl("txt_CustomerID_M")
        Dim tb2 As TextBox = Login1.FindControl("Username")
        Dim tb2_M As TextBox = Login2.FindControl("Username")
        Dim tb3 As TextBox = Login1.FindControl("Password")
        Dim tb3_M As TextBox = Login2.FindControl("Password")

        Dim reqfieldvaluserID As RequiredFieldValidator = Login1.FindControl("CustomerIDrequired")
        Dim reqfieldvaluserID_M As RequiredFieldValidator = Login2.FindControl("CustomerID_M_required")
        Dim reqfieldvaluserName As RequiredFieldValidator = Login1.FindControl("UserNamerequired")
        Dim reqfieldvaluserName_M As RequiredFieldValidator = Login2.FindControl("UserName_M_required")
        Dim reqfieldvalpassw As RequiredFieldValidator = Login1.FindControl("Passwordrequired")
        Dim reqfieldvalpassw_M As RequiredFieldValidator = Login2.FindControl("Passwordrequired_M")

        Dim regexuserID As RegularExpressionValidator = Login1.FindControl("valid_getNumberInput")
        Dim regexuserID_M As RegularExpressionValidator = Login2.FindControl("valid_getNumber_M_Input")
        Dim regexusername As RegularExpressionValidator = Login1.FindControl("check_UserName_regex")
        Dim regexusername_M As RegularExpressionValidator = Login2.FindControl("check_UserName_M_regex")
        Dim cb As CheckBox = Login1.FindControl("RememberMe")
        Dim cb_M As CheckBox = Login2.FindControl("RememberMe_M")


        If String.IsNullOrEmpty(tb.Text) = False AndAlso String.IsNullOrEmpty(tb_M.Text) = True Then
            reqfieldvaluserID.Enabled = True
            reqfieldvaluserID_M.Enabled = False
            reqfieldvaluserID.Validate()
            If reqfieldvaluserID.IsValid = True Then
                regexuserID.Validate()
                If regexuserID.IsValid Then
                    Customer_ID = tb.Text
                Else
                    VERAG_VARIABLES.seterrorcount(1)
                    regexuserID.ErrorMessage = VERAG_VARIABLES.geterrornumb + ": Customer-ID has to be a number."
                End If
            End If
        End If
        If String.IsNullOrEmpty(tb_M.Text) = False AndAlso String.IsNullOrEmpty(tb.Text) = True Then
            reqfieldvaluserID.Enabled = False
            reqfieldvaluserID_M.Enabled = True
            If reqfieldvaluserID_M.IsValid = True Then
                regexusername_M.Validate()
                If regexusername_M.IsValid Then
                    Customer_ID = tb_M.Text
                Else
                    VERAG_VARIABLES.seterrorcount(2)
                    regexusername_M.ErrorMessage = VERAG_VARIABLES.geterrornumb + "Customer-ID does not have any special characters in it."
                End If
            End If
        End If
        If String.IsNullOrEmpty(tb2.Text) = False AndAlso String.IsNullOrEmpty(tb2_M.Text) = True Then
            reqfieldvaluserName.Enabled = True
            reqfieldvaluserName_M.Enabled = False
            regexusername.Validate()
            If reqfieldvaluserName.IsValid = True Then
                If regexusername.IsValid Then
                    UserNaMe = tb2.Text
                Else
                    VERAG_VARIABLES.seterrorcount(2)
                    regexusername_M.ErrorMessage = VERAG_VARIABLES.geterrornumb + "Username does not have any special characters in it."
                End If
            Else

                reqfieldvaluserName.ErrorMessage = String.Empty
            End If
        End If
        If String.IsNullOrEmpty(tb2_M.Text) = False AndAlso String.IsNullOrEmpty(tb2.Text) = True Then
            reqfieldvaluserName.Enabled = False
            reqfieldvaluserName_M.Enabled = True
            reqfieldvaluserName_M.Validate()
            If reqfieldvaluserName_M.IsValid = True Then
                regexusername_M.Validate()
                If regexusername.IsValid Then
                    UserNaMe = tb2_M.Text
                Else
                    VERAG_VARIABLES.seterrorcount(3)
                    regexusername.ErrorMessage = VERAG_VARIABLES.geterrornumb + "Password has to match the criterias of tge info button."
                End If
            End If
        End If
        If String.IsNullOrEmpty(tb3.Text) = False AndAlso String.IsNullOrEmpty(tb3_M.Text) = True Then
            reqfieldvalpassw.Enabled = True
            reqfieldvalpassw_M.Enabled = False
            reqfieldvalpassw.Validate()
            If reqfieldvalpassw.IsValid = True Then
                passw = tb3.Text
            End If
        End If
        If String.IsNullOrEmpty(tb3_M.Text) = False AndAlso String.IsNullOrEmpty(tb3.Text) = True Then
            reqfieldvalpassw.Enabled = False
            reqfieldvalpassw_M.Enabled = True

            reqfieldvalpassw_M.Validate()
            If reqfieldvalpassw_M.IsValid = True Then
                passw = tb3_M.Text
            Else
                VERAG_VARIABLES.seterrorcount(4)
                reqfieldvalpassw_M.ErrorMessage = String.Empty
            End If
        End If
        ' Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Using con As New SqlConnection(ConnectionString)
            ' Using cmd As New SqlCommand("Validate_User")
            Using cmd As New SqlCommand("SELECT KundenNr,Username,Password FROM [VERAG_HOMEPAGE].[dbo].[Users] WHERE Username=@Username AND Password=@Password AND KundenNr=@KundenNr")
                ' cmd.CommandType = CommandType.StoredProcedure
                cmd.Parameters.AddWithValue("@Username", UserNaMe)
                cmd.Parameters.AddWithValue("@KundenNr", Customer_ID)
                cmd.Parameters.AddWithValue("@Password", passw)
                cmd.Connection = con
                con.Open()
                ' userId = Convert.ToInt32(cmd.ExecuteScalar())
                Dim dr As SqlDataReader = cmd.ExecuteReader()
                If dr.HasRows Then
                    dr.Read()
                    'MsgBox(dr.Item(0).ToString())
                    Select Case dr.Item(0)
                        Case 0
                            VERAG_VARIABLES.seterrorcount(5)
                            Login1.FailureText = VERAG_VARIABLES.geterrornumb + "Username and/or Password do not match."
                            Exit Select
                        Case -2
                            VERAG_VARIABLES.seterrorcount(6)
                            Login1.FailureText = VERAG_VARIABLES.geterrornumb + "Account is not activated."
                            Exit Select
                        Case Else
                            If tb.Text = dr("KundenNr") Then
                                Customer_ID = dr("KundenNr").ToString
                            Else
                                VERAG_VARIABLES.seterrorcount(7)
                                Login1.FailureText = VERAG_VARIABLES.geterrornumb + "ID cannot be found in the database!"
                            End If
                            If tb2.Text = dr("Username") Then
                                UserNaMe = dr("Username").ToString
                            Else
                                VERAG_VARIABLES.seterrorcount(8)
                                Login1.FailureText = VERAG_VARIABLES.geterrornumb + "Username is not in the database!"
                            End If
                            If tb3.Text = dr("Password") Then
                                passw = dr("Password").ToString
                            Else
                                VERAG_VARIABLES.seterrorcount(9)
                                Login1.FailureText = VERAG_VARIABLES.geterrornumb + "Password is not in the database!"
                            End If

                            'MsgBox("Erfolgreich validiert.")
                            Session.Add("test", UserNaMe)
                            Session.Add("CustomerID", Customer_ID)
                            Session.Add("PW", passw)
                            Exit Select
                    End Select
                End If
                dr.Close()
                con.Close()
            End Using
            Using cmd2 As New SqlCommand("UPDATE [VERAG_HOMEPAGE].[dbo].[Users] SET [LastLoginDate]=@Date WHERE [Username]=@Username AND [KundenNr]=@KundenNr AND Password=@Password")
                cmd2.Parameters.AddWithValue("Date", Date.Now.ToString)
                cmd2.Parameters.AddWithValue("Username", UserNaMe)
                cmd2.Parameters.AddWithValue("KundenNr", Customer_ID)
                cmd2.Parameters.AddWithValue("Password", passw)
                cmd2.Connection = con
                con.Open()
                cmd2.ExecuteNonQuery()
                con.Close()
            End Using
        End Using

        If String.IsNullOrEmpty(tb2_M.Text) = False AndAlso String.IsNullOrEmpty(tb2.Text) = True Then
            FormsAuthentication.SetAuthCookie(Login1.UserName, cb_M.Checked)
        ElseIf String.IsNullOrEmpty(tb2.Text) = False AndAlso String.IsNullOrEmpty(tb2_M.Text) = True Then
            FormsAuthentication.SetAuthCookie(Login2.UserName, cb.Checked)
        End If
        'If (String.IsNullOrEmpty(passw) = False And String.IsNullOrEmpty(UserNaMe) = False And String.IsNullOrEmpty(Customer_ID) = False) Then
        'Dim str = gensaltToken(UserNaMe, passw, Customer_ID, Session.IsNewSession)
        'MsgBox(str)
        'End If
        FormsAuthentication.RedirectFromLoginPage(UserNaMe, True)

    End Sub

    Protected Sub LoginButton_Click(sender As Object, e As EventArgs)
        Validate("Login")
        Session.Add("test", UserNaMe)
        Session.Add("CustomerID", Customer_ID)
        Session.Add("PW", passw)
    End Sub
    Protected Sub LoginButton_M_Click(sender As Object, e As EventArgs)
        Validate("Login_M")
        Session.Add("test", UserNaMe)
        Session.Add("CustomerID", Customer_ID)
        Session.Add("PW", passw)
    End Sub
    Function gensaltToken(username As String, password As String, CustomerID As String, isnewSession As Boolean) As String
        If isnewSession = False Then
            Dim time() As Byte = BitConverter.GetBytes(DateTime.UtcNow.ToBinary())
            Dim Key() As Byte = Guid.NewGuid().ToByteArray()
            Dim token As String
            Dim MyMin As Integer = 155, MyMax As Integer = 875, My1stRandomNumber As Integer, My2ndRandomNumber As Integer
            ' Create a random number generator
            Dim Generator As System.Random = New System.Random()
            ' Get a random number >= MyMin and <= MyMax
            My1stRandomNumber = Generator.Next(MyMin, MyMax + 1) ' Note: Next function returns numbers _less than_ max, so pass in max + 1 to include max as a possible value

            ' Get another random number (don't create a new generator, use the same one)
            My2ndRandomNumber = Generator.Next(MyMin, MyMax + 1)
            If String.IsNullOrEmpty(username) = False And String.IsNullOrEmpty(passw) = False And String.IsNullOrEmpty(CustomerID) = False Then
                Try
                    Dim salt As String = VERAG_VARIABLES.GenerateSalt(My1stRandomNumber)
                    Dim passw As String = password
                    token = VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(VERAG_VARIABLES.HashPassword(passw, salt, 10101, My1stRandomNumber))
                    Return token
                Catch Ex As Exception
                    'Dim Msg, Style, Title As String
                    'Msg = "Token Generation failed" & vbCrLf & "A new E-mail has been sent to the intern e-mail given."
                    'Style = vbRetry + vbExclamation + vbDefaultButton1
                    'Title = "Error05: Token-Generierung"
                    'MsgBox(Msg, Style, Title)
                    'If MsgBox(Msg, Style, Title).Retry Then
                    'genToken(username, password, email)
                    Dim salt As String = VERAG_VARIABLES.GenerateSalt(My1stRandomNumber)
                    Dim passw As String = password
                    token = VERAG_PROG_ALLGEMEIN.cCryptography3.Encrypt(VERAG_VARIABLES.HashPassword(passw, salt, 10101, My2ndRandomNumber))


                    'Else
                    'MsgBox("Token-Generation has not been successful." & vbCrLf & "Please try again in five seconds!")
                    Dim jetzt As DateTime = DateTime.UtcNow
                    Dim wenn As DateTime = DateTime.UtcNow.AddSeconds(-5)

                    If jetzt < wenn Then
                        Return "NotYet"
                    Else
                        token = gensaltToken(username, password, CustomerID, Session.IsNewSession)
                        Return token
                        'End If
                    End If
                End Try
            Else
                Return String.Empty
            End If
        Else
            Return "Error in Session ID. It has changed. Please check admin!"
        End If
    End Function
End Class