# Agent I: Hilt DI Modules

## Phase: 3 (Core Logic)
## Depends on: Agent A (Gradle), Agent C (Room database)

## Context
Set up Hilt dependency injection for the entire app.
Provides singletons for database, network, crypto components.

## Task
Create all Hilt DI modules for the application.

## Files to Create

### 1. di/AppModule.kt
```kotlin
package com.kecalek.chat.di

import android.content.Context
import androidx.room.Room
import com.kecalek.chat.data.local.AppDatabase
import dagger.Module
import dagger.Provides
import dagger.hilt.InstallIn
import dagger.hilt.android.qualifiers.ApplicationContext
import dagger.hilt.components.SingletonComponent
import net.sqlcipher.database.SupportFactory
import javax.inject.Singleton

@Module
@InstallIn(SingletonComponent::class)
object AppModule {

    @Provides
    @Singleton
    fun provideDatabase(
        @ApplicationContext context: Context,
    ): AppDatabase {
        // TODO: Get database passphrase from secure storage
        // For now, use a placeholder. In production, derive from identity key.
        val passphrase = "TODO_REPLACE_WITH_DERIVED_KEY".toByteArray()
        val factory = SupportFactory(passphrase)

        return Room.databaseBuilder(
            context,
            AppDatabase::class.java,
            "kecalek_chat.db"
        )
            .openHelperFactory(factory)
            .fallbackToDestructiveMigration()
            .build()
    }
}
```

### 2. di/DatabaseModule.kt
```kotlin
package com.kecalek.chat.di

import com.kecalek.chat.data.local.AppDatabase
import com.kecalek.chat.data.local.dao.ConversationDao
import com.kecalek.chat.data.local.dao.MessageDao
import com.kecalek.chat.data.local.dao.UserCacheDao
import dagger.Module
import dagger.Provides
import dagger.hilt.InstallIn
import dagger.hilt.components.SingletonComponent

@Module
@InstallIn(SingletonComponent::class)
object DatabaseModule {

    @Provides
    fun provideMessageDao(db: AppDatabase): MessageDao = db.messageDao()

    @Provides
    fun provideConversationDao(db: AppDatabase): ConversationDao = db.conversationDao()

    @Provides
    fun provideUserCacheDao(db: AppDatabase): UserCacheDao = db.userCacheDao()
}
```

### 3. di/NetworkModule.kt
```kotlin
package com.kecalek.chat.di

import dagger.Module
import dagger.Provides
import dagger.hilt.InstallIn
import dagger.hilt.components.SingletonComponent
import javax.inject.Singleton

@Module
@InstallIn(SingletonComponent::class)
object NetworkModule {

    // TODO: Provide ConnectionManager singleton
    // TODO: Provide ProtocolHandler singleton
    // TODO: Provide ServerApi singleton

    // Placeholder — will be wired when network layer is implemented by Claude Code
}
```

### 4. di/CryptoModule.kt
```kotlin
package com.kecalek.chat.di

import dagger.Module
import dagger.hilt.InstallIn
import dagger.hilt.components.SingletonComponent

@Module
@InstallIn(SingletonComponent::class)
object CryptoModule {

    // TODO: Provide crypto components (implemented by Claude Code)
    // - AesGcmCrypto
    // - HkdfUtils
    // - KeyEncryption (ECP1)
    // - Ed25519Crypto
    // - X25519Crypto
    // - RSACrypto
    // - MessagePadding
    // - ContactVerification

    // Placeholder — will be wired when crypto layer is implemented by Claude Code
}
```

## Constraints
- All modules use `@InstallIn(SingletonComponent::class)` unless scoped differently
- Database uses SQLCipher encryption via SupportFactory
- DAO providers are simple pass-through from AppDatabase
- Network and Crypto modules are placeholders (Claude Code implements the actual classes)
- Use `@Singleton` for expensive objects (database, network manager)

## DO NOT
- Implement actual crypto or network classes
- Add any UI-related bindings
- Create ViewModel bindings (Hilt handles those automatically via @HiltViewModel)