feat: Language filter

[abughalib]

What

• Dev mode language search

Screenshot

screen-20220707-233805.mp4

Part of

#2482

[AshAman999]

Thanks for making that big effort to map the data to the language translations (+1 points for not using any librabry) and research about the supported languages for flutter.
Had some comments , If u could have a look.

[monsieurtanuki]

Hi @abughalib!
I'm sure the code can be improved; please have a look at my comments.

[teolemon]

We have the theoretical possibility of using : https://static.openfoodfacts.org/data/taxonomies/languages.json

[codecov-commenter]

Codecov Report

Merging #2539 (7d5cfa1) into develop (2ea0da3) will decrease coverage by 1.41%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop   #2539      +/-   ##
==========================================
- Coverage     8.86%   7.45%   -1.42%     
==========================================
  Files          161     214      +53     
  Lines         6623   10251    +3628     
==========================================
+ Hits           587     764     +177     
- Misses        6036    9487    +3451     

Impacted Files	Coverage Δ
...kages/smooth_app/lib/widgets/attribute_button.dart	0.00% <0.00%> (-92.00%)	⬇️
...s/smooth_app/lib/data_models/user_preferences.dart	8.73% <0.00%> (-23.57%)	⬇️
packages/smooth_app/lib/themes/smooth_theme.dart	60.00% <0.00%> (-22.98%)	⬇️
...p/lib/generic_lib/dialogs/smooth_alert_dialog.dart	15.11% <0.00%> (-19.10%)	⬇️
...mooth_app/lib/data_models/product_preferences.dart	24.65% <0.00%> (-6.78%)	⬇️
packages/smooth_app/lib/main.dart	14.16% <0.00%> (-3.73%)	⬇️
.../smooth_app/lib/pages/onboarding/welcome_page.dart	0.00% <0.00%> (-3.13%)	⬇️
.../smooth_app/lib/pages/onboarding/scan_example.dart	0.00% <0.00%> (-2.28%)	⬇️
...p/lib/pages/onboarding/consent_analytics_page.dart	0.00% <0.00%> (-1.57%)	⬇️
...smooth_app/lib/pages/product/new_product_page.dart	0.00% <0.00%> (-0.88%)	⬇️
... and 226 more

[abughalib]

screen-20220711-183438.mp4

[monsieurtanuki]

That's much better @abughalib, thank you for your strong rewriting!
I still have several comments, please have a look at them.
In particular, I don't see the point of using your new Pair class: what you need is either a list of 2-character lang codes or even better a list of OpenFoodFactsLanguages. From it you can retrieve everything (name in English, name in language, 2-character code).

[abughalib]

screen-20220720-210816.mp4

The search method now supports Name in English and language code in English.
The code is less efficient in terms of time complexity.

[monsieurtanuki]

Thank you @abughalib!

This is not the way I would have coded it but I must say that there were massive improvements compared to the early version and I assume that the code works.

We'll see later (in a future issue/PR) if changes are needed. Regarding performance or possible typos about the name in English.

[I haven't seen your latest changes]

[abughalib]

@monsieurtanuki
I realized further performance optimization can be done this morning and I started working on it half hour ago.
Please let me know if I can make it even better.

[AshAman999]

Should be good to go for now, we can optimize it later if needed

[AshAman999]

@M123-dev @teolemon
Can we move this language selection out of dev mode, might close as well #2503

[teolemon]

@AshAman999 merging this one for now, and yes, we can then open a PR to make language selection for all (might require some other behavior changes, for data refresh)

[AshAman999]

Anyways, Congratulations on your 1st PR here ㊗️
And thanks @abughalib for the same

[abughalib]

💯

[M123-dev]

And sorry that it took so long @abughalib

[abughalib]

@M123-dev
Not a Problem, Learned a lot during the process.