How to implement 3 times login attempts with a 15 minutes login blockage at incorrect entries. (CI + smarty)

[eluser]Unknown[/eluser]
Hi,

I am using smarty + code igniter. I am trying to develop an application, where after 3 invalid login attempts the user should be blocked for 15 mins (or for a certain period of time). Also, if he tries to login after he has been blocked, a message shud appear stating the remaining time duration (message may be like- " After 10 minutes, you can try login.", after 3 minutes - " After 7 minutes, you can try login.",).
Hope to get some positive feedbacks !