How to add or delete default value theme options while activate and deactivate theme

Question

I want to add & reset default value for my theme options while activate and deactivate a theme

More clearly something like this

if(theme active)
  add_option(); 
  // add new option to the theme and register default setting for one time only

if(theme deactivate)
   delete_option();
  // reset current option and delete default setting  for one time only

Question

How know is theme active or not? What a function or hook for this one. Let me know

Answer 1

I think what you are looking for was answered here:

• Theme Activate Hook