Full inventory // double chest?

[dudle]

I have 2 questions. Is it possible to detect if a player has a full inventory when executing a command? how?
And second thing, how can I make it so when I open a chest it'd somehow detect that it's a double chest? I'm just doing a chest filling system and when I open 1 part of the large chest there's one set of items but when I click and open the other part of the large chest, it'd show me a different set of items filling the chest.

 

[Donut]

I have 2 questions. Is it possible to detect if a player has a full inventory when executing a command? how?
And second thing, how can I make it so when I open a chest it'd somehow detect that it's a double chest? I'm just doing a chest filling system and when I open 1 part of the large chest there's one set of items but when I click and open the other part of the large chest, it'd show me a different set of items filling the chest.

I feel like theres an 'if inventory is full' expression but couldnt find it on the docs but you can always just check if the player can hold 1 of a non-stackable item.

For the double chest you can just check on rightclick on chest if the block 1 block north/south/east/west is also a chest