Custom Rails ActiveAdmin page with a simple workflow for import

I am using ActiveAdmin for one of my projects and I am very disappointed with its learning curve. ActiveAdmin does a pretty good job of doing simple things in a book, but when it comes to something pretty complex it gets pretty complicated.

I'm trying to create this simple use case, but I'm really stuck with ActiveAdmin. USECASE:

• The user opens a custom page, i.e. called program
• There it finds a simple file input form that allows it to upload a file
• After submitting the file, the user is redirected to a summary page, which displays the contents of the file, the parsed program, and information about what will happen when he confirms the action. There will be a confirm and cancel button.
• When the confirm button is pressed, the file is processed and the result is displayed

How do I accomplish this simple and trivial use case with ActiveAdmin? Can anyone provide a simple example with a custom page, controller actions, appropriate partial view, or whatever it takes to get it done?

Thank.