Expand existing plugin for wordpress

I have a wordpress plugin that let's you save your favourite woocommerce products. The plugin today has a notify if products comes back in stock function. I am now looking for expanding this plugin to a notify if products drops in price. It also needs to work with registered users. Additional, I need the products to be grayed out (text and image) in the wishlist with a text "Out of stock" if the productsf set to draft. Requirements for plugin: - Price drop notification through email with a fully template (something like the exisitng wishlist is ok) with a unsubscribe - Editable price drop email text preferably inside the plugin. - Work with registered users, non-registered users and social plugin - Checkboxes next to product on wishlist page that is checked by default, so if they don't want to recieve notifications for particular products they can uncheck. - Products is greyed out and set with a text "out of stock" if products is set to draft - I need to know each file that is edited. Preferably in a ziped folder.