Improve post-merge situation

[mislavmatijevic]

After merging of #11 and #9 (17eff3d) into main, a lot of errors were introduced because both branches included changes to the project files structure. Some of these errors were fixed directly on main, but others are to be solved in the frame of this issue.

• [x] Fix adding of product into a package
• [x] Refresh products and packages after a CRUD operation.
• [x] SalesMenuScreen.of(context) doesn't return SalesMenuScreenState, which means whoever is accessing this State needs to figure out a different way to get to needed data.
• [x] Fix editing of a product -> currently it shows the wrong quantity
• [x] item_card.dart -> changeAmount should also invoke onAmountChange's code
• [x] package_creation_2.dart -> selectedAmount used instead of quantity
• [x] ProductCounterCard not being displayed.
• [x] Enable adding products to new package
• [x] after selling, back button destroys navigation and leads user to a black screen
• [x] if invoice finalization fails (for example, buyer doesn't have enough funds), seller gets their amount reduced but buyer is not affected
• [x] package price equals sum of individual product prices, not actual amount!!!
• [x] refresh of products tab not working! Has something to do with bad state management!
• [x] deleting a selected product could cause havoc (not tested)
• [x] package remaining amount is basically sum of products, not actual number of possible remaining packages with given product stocks!

[mislavmatijevic]

@jfletcher20 If you catch some time tommorow, this is how far I've come. I'll try to work on this some more later tommorow.

[jfletcher20]

Changelog

Important ⏫

• [ ] item_card.dart -> changeAmount should also invoke onAmountChange's code

I don't understand what you mean by this - or what you intend, rather. IT seems to work fine for purposes of adding products to a package, at least. Should it also check if the store has that many products in stock, though, to limit adding only the amount that's in stock, or is the amount in stock at the moment of package creation irrelevant and only comes into play when creating a sale?

• [x] ~ProductCounterCard not being displayed.~

I crossed out this task since ProductCounterCard has been deleted

Insignificant ⏬

• [x] Refresh products and packages after a CRUD operation.
• [x] Fix editing of a product -> currently it shows the wrong quantity

When the user edits a product, the tab refreshes - but the context menu for editing/deleting remains up, retaining the old product information. This means that if you update the name of example product "Keybrd" to "Keyboard", submit changes, then press edit again, the textcontrollers autofill with "Keybrd" instead of "Keyboard". This bug is very insignificant and should be the least of our priorities. (The bug does NOT appear when editing packages, so that's good.)

[mislavmatijevic]

@jfletcher20 Application works pretty good now. Still, some errors persist.

[mislavmatijevic]

Merged with main.

[mislavmatijevic]

There are still things left to be fixed before production (and hopefully after)!

[mislavmatijevic]

I think we can agree, post-merge apocalypse is over. Back to maintaining.