Creating a random item giver mod

[TheMayoMan11]

Hi!

I'm very new to minecraft modding and Java coding but not to coding itself. I've got a modpack for 1.12.2 and I would like to create a mod that simply gives every player in game 1 random item every 15 seconds. I can't seem to find any plugins or mods that can do this with sponge so I'm opting to creating a mod because I would like to a skyblock on the server I'm using this for but its only one block and you get a random item every 15 seconds so you can progress. I can't really find any simple way to have the mod I'm creating, spawn any item in the game without having to write every single item in the game manually and then the code selecting a random number corresponding to that item to select the item they are giving the player. Any help would be greatly appreciate and pls remember I'm pretty new to all this.

Cheers!

[Draco18s]

There's already a collection that contains all the items in the game, its called the "item registry" and Forge tracks them.