[Roniscend]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

Populates conjugation tables from the database in contract order using a single DB pass, fixes a leaked DB connection, and adds an explicit loading/error ViewModel with tests.
Closes #571

[andrewtavis]

As expected there are some merge conflicts here now, @Roniscend :) Would you be able to fix those? And will merging this PR in close #571, or if not what further work do we need to do?

[Roniscend]

As expected there are some merge conflicts here now, @Roniscend :) Would you be able to fix those? And will merging this PR in close #571, or if not what further work do we need to do?

Sure, will fix the merge conflicts also yeah this pr closes the issue

[andrewtavis]

Thanks for fixing the conflicts, @Roniscend! Let's plan on bringing this in tomorrow during the call :)

CC @ashb155 as well 👋

[prince-0408]

Thanks for the work here @Roniscend!

The ViewModel architecture (ConjugationSelectionUiState), the error/empty states with retry handling, and the Compose cell layout improvements (heightIn(min = 100.dp) / maxLines = 2) look great and nicely address #571.

A few key points to address before this is ready to merge:

1. Reusing getStructuredConjugations from PR #742:
   Commit 264c2f06 on main already introduced getStructuredConjugations and its helper methods, which already resolve conjugations in a single pass while properly quoting SQL identifiers, applying LIMIT 1, handling case-insensitivity, prefix-stripping, and inflected form fallback. We can remove getConjugationsForVerb (and its helper methods) from ConjugateDataManager.kt and have ConjugationSelectionViewModel call getStructuredConjugations(languageAlias, contract, verb) directly. This will also allow removing the duplicate tests and @Suppress("LargeClass") from ConjugateDataManagerTest.kt.
2. Case-sensitivity bug in databaseExists:
   Conjugate database filenames are uppercase (${alias.uppercase()}ConjugateData.sqlite). On case-sensitive Android filesystems, lowercase aliases like "en" or "de" will fail .exists() and get stuck in NoData.
3. Keying selectedTenseGroup:
   Keying rememberSaveable(verb, languageAlias) ensures the tense selection is cleared when navigating between verbs or languages.

Detailed inline comments and suggestions are below.

[prince-0408]

In commit 264c2f06 (PR #742), ConjugateDataManager.kt on main already introduced:

• getStructuredConjugations(language, yamlData, word)
• getVerbRowData (handles case-insensitive search, prefix stripping for "to ", "se ", "sich ", and fallback to inflected forms)
• resolveConjugatedValue
• parseComplexFormFromRow (properly quoting target columns with SqlIdentifier.quote and adding LIMIT 1)

The newly added getConjugationsForVerb, getColumnIndexWithFallback, getConjugatedValueFromCursor, parseComplexForm, and getVerbCursor duplicate this entire pipeline while missing SqlIdentifier.quote, LIMIT 1, and the prefix-stripping/inflected search improvements.

We can remove getConjugationsForVerb and its private helper methods completely and have ConjugationSelectionViewModel call getStructuredConjugations(languageAlias, contract, verb) directly.

[prince-0408]

Conjugate database files created by ConjugateDynamicDbHelper and checked by DatabaseFileManager are uppercase (e.g., ENConjugateData.sqlite, DEConjugateData.sqlite). On Android's Linux filesystem, file lookups are case-sensitive.

If languageAlias is passed as lowercase ("en", "de", "fr"), application.getDatabasePath("${alias}ConjugateData.sqlite") looks for enConjugateData.sqlite, which fails .exists() and permanently leaves the screen in ConjugationSelectionUiState.NoData.

Suggested change

	application.getDatabasePath("${alias}ConjugateData.sqlite").exists()
	application.getDatabasePath("${alias.uppercase()}ConjugateData.sqlite").exists()

[prince-0408]

Checking databaseExists(languageAlias) before loadOrDownloadContract avoids unnecessary network and file operations if the conjugate database isn't downloaded yet.

Additionally, we can call the existing getStructuredConjugations(languageAlias, contract, verb) from main instead of getConjugationsForVerb.

Suggested change

	val contract = contractDataLoader.loadOrDownloadContract(languageAlias)
	if (contract == null) {
	_uiState.value = ConjugationSelectionUiState.Error
	return@launch
	}
	if (!databaseExists(languageAlias)) {
	_uiState.value = ConjugationSelectionUiState.NoData
	return@launch
	}
	val data = conjugateDataManager.getConjugationsForVerb(verb, languageAlias, contract)
	if (!databaseExists(languageAlias)) {
	_uiState.value = ConjugationSelectionUiState.NoData
	return@launch
	}
	val contract = contractDataLoader.loadOrDownloadContract(languageAlias)
	if (contract == null) {
	_uiState.value = ConjugationSelectionUiState.Error
	return@launch
	}
	val data = conjugateDataManager.getStructuredConjugations(languageAlias, contract, verb)

[prince-0408]

selectedTenseGroup is remembered with rememberSaveable without keys. When navigating to another verb or language, the selected tense filter persists from the previous verb. If that tense group does not exist in the new verb's contract, tenseGroups[targetGroup] resolves to null and the card renders blank.

Keying rememberSaveable by verb and languageAlias resets the tense filter when the verb or language changes.

Suggested change

	var selectedTenseGroup by rememberSaveable { mutableStateOf<String?>(null) }
	var selectedTenseGroup by rememberSaveable(verb, languageAlias) { mutableStateOf<String?>(null) }

[angrezichatterbox]

Thanks for the review @prince-0408 and awesome work on the PR @Roniscend. I have made some minor changes to finalise the PR. Once again thanks for the work.