Discount for the next order

Hi,
I have to add a coupon to give discount to the next order of a client, after a successful purchasing.

I've creating an inactive coupon for this purpose. Now I have to add this feature to every product.

This is the problem. The products are thousands. It is not possible to do this one by one.

I've tried to use the bulk operations module but unfortunately the features of a product are not included as I saw.

Is there any other way to apply the coupon after any successful purchasing? And of course to send an email to the customer same time?

I appreciate any suggestion.