73 lines
2.6 KiB
Kotlin
73 lines
2.6 KiB
Kotlin
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package dev.privacyllc.period.di
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import android.content.Context
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import androidx.datastore.core.DataStore
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import androidx.datastore.preferences.core.PreferenceDataStoreFactory
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import androidx.datastore.preferences.core.Preferences
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import androidx.datastore.preferences.preferencesDataStoreFile
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import dagger.Module
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import dagger.Provides
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import dagger.hilt.InstallIn
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import dagger.hilt.android.qualifiers.ApplicationContext
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import dagger.hilt.components.SingletonComponent
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import dev.privacyllc.period.core.data.CycleData
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import dev.privacyllc.period.core.data.CycleRepository
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import dev.privacyllc.period.core.datastore.UserPreferencesRepository
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import dev.privacyllc.period.domain.prediction.BaselinePredictionEngine
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import dev.privacyllc.period.domain.prediction.PredictionEngine
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import java.time.Clock
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import javax.inject.Singleton
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/**
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* Where the app learns what a file path is, and the only place it does.
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*
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* Note what is absent: no `PeriodDatabase`, no DAO, no Room import anywhere in
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* this module or anywhere above it. `CycleData.repository` hands back a
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* repository and keeps the storage to itself — see
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* docs/architecture/README.md.
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*/
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@Module
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@InstallIn(SingletonComponent::class)
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object DataModule {
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/**
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* Singleton because Room and DataStore both are: two instances over one
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* file is a corruption bug that only shows up under concurrency.
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*/
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@Provides
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@Singleton
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fun cycleRepository(
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@ApplicationContext context: Context,
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engine: PredictionEngine,
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clock: Clock,
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): CycleRepository = CycleData.repository(context, engine, clock)
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@Provides
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@Singleton
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fun preferencesDataStore(@ApplicationContext context: Context): DataStore<Preferences> =
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PreferenceDataStoreFactory.create {
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context.preferencesDataStoreFile("user_preferences")
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}
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@Provides
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@Singleton
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fun userPreferencesRepository(store: DataStore<Preferences>) = UserPreferencesRepository(store)
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/**
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* Batch 02 replaces this binding, and only this binding.
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*
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* The rest of the app depends on [PredictionEngine], never on an
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* implementation — so swapping in the real engine is one line here, and the
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* §51 acceptance tests can run against both to show the replacement is
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* better rather than merely different.
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*/
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@Provides
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@Singleton
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fun predictionEngine(): PredictionEngine = BaselinePredictionEngine()
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/** Injected rather than read from the environment, so §50's date edge cases stay testable. */
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@Provides
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@Singleton
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fun clock(): Clock = Clock.systemDefaultZone()
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}
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