Insert record to Database if record Exists using Stored Procedure in SQL Server

here i want to add logId from Login table and logtime to Logdetails table if uname and upasswd matches that in login table.. hw can i do this??

with below code logid is not getting added to logdetails table..but logtime is getting entered to Table..

create procedure [dbo].[login]
(
    @uname NVARCHAR(20),
    @upasswd NVARCHAR(20)
)
as
    declare @status int,@logId int, @Logtime datetime=GETDATE()

    if exists(select * from Login where uname=@uname and upasswd=@upasswd)
    begin
        insert into LogDetails(logId,Logtime) values(@logId,@Logtime) 
        set @status=1
    end
    else
       set @status=0
select @status