Implement view model provider, local database

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
 
     <application
+        android:name=".PokeSearch"
         android:allowBackup="true"
         android:enableOnBackInvokedCallback="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

app/src/main/java/com/ti/mobpo/AppViewModelProvider.kt

@@ -0,0 +1,21 @@
+package com.ti.mobpo
+
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.createSavedStateHandle
+import androidx.lifecycle.viewmodel.CreationExtras
+import androidx.lifecycle.viewmodel.initializer
+import androidx.lifecycle.viewmodel.viewModelFactory
+import com.ti.mobpo.ui.pokesearch.PokeSearchViewModel
+
+object AppViewModelProvider {
+    val Factory = viewModelFactory {
+        initializer {
+            PokeSearchViewModel(
+                pokesearchApplication().appContainer.favouritesRepository
+            )
+        }
+    }
+}
+
+fun CreationExtras.pokesearchApplication(): PokeSearch =
+    (this[ViewModelProvider.AndroidViewModelFactory.APPLICATION_KEY] as PokeSearch)

app/src/main/java/com/ti/mobpo/PokeSearch.kt

@@ -0,0 +1,19 @@
+package com.ti.mobpo
+
+import android.app.Application
+import com.ti.mobpo.data.AppContainer
+import com.ti.mobpo.data.AppDataContainer
+
+class PokeSearch : Application() {
+    lateinit var appContainer: AppContainer
+        private set
+
+    override fun onCreate() {
+        super.onCreate()
+        appContainer = createAppContainer()
+    }
+
+    private fun createAppContainer(): AppContainer {
+        return AppDataContainer(this)
+    }
+}

app/src/main/java/com/ti/mobpo/data/FavouriteDao.kt

@@ -17,4 +17,7 @@ interface FavouriteDao {
 
     @Query("SELECT id FROM favourites")
     fun getAllFavoriteIds(): Flow<List<Int>>
+
+    @Query("SELECT EXISTS(SELECT 1 FROM favourites WHERE id = :id LIMIT 1)")
+    suspend fun isFavourite(id: Int): Boolean
 }

app/src/main/java/com/ti/mobpo/data/FavouritesRepository.kt

@@ -20,4 +20,10 @@ interface FavouritesRepository {
      * Delete item from the data source
      */
     suspend fun deleteItem(item: Favourite)
+
+    /**
+     * Check if the item is a favourite
+     */
+
+    suspend fun isFavourite(id: Int): Boolean
 }

app/src/main/java/com/ti/mobpo/data/OfflineFavouritesRepository.kt

@@ -13,4 +13,8 @@ class OfflineFavouritesRepository(private val favouriteDao: FavouriteDao) : Favo
     override suspend fun deleteItem(item: Favourite) {
         favouriteDao.delete(item)
     }
+
+    override suspend fun isFavourite(id: Int): Boolean {
+        return favouriteDao.isFavourite(id)
+    }
 }

app/src/main/java/com/ti/mobpo/ui/Navigation.kt

@@ -20,6 +20,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
@@ -30,7 +31,6 @@ import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
-import com.ti.mobpo.ui.pokesearch.PokeSearchViewModel
 import com.ti.mobpo.ui.screens.Favourites
 import com.ti.mobpo.ui.screens.PokeSearchScreen
 
@@ -61,8 +61,6 @@ fun Navigation() {
     val updatedSelectedIndex = items.indexOfFirst { it.route == currentRoute }
     selectedItemIndex = rememberUpdatedState(updatedSelectedIndex).value
 
-    val pokeSearchViewModel: PokeSearchViewModel = viewModel()
-
     Scaffold (
         bottomBar = {
             NavigationBar {
@@ -106,7 +104,7 @@ fun Navigation() {
                             ExitTransition.None
                         }) {
                         composable(route = Screen.PokeSearch.route) {
-                            PokeSearchScreen(pokeSearchViewModel)
+                            PokeSearchScreen()
                         }
                         composable(
                             route = Screen.Favourites.route) {
@@ -124,7 +122,6 @@ fun Navigation() {
 @Composable
 fun NavigationPreview() {
     Surface {
-        val pokeSearchViewModel: PokeSearchViewModel = viewModel()
+        PokeSearchScreen()
-        PokeSearchScreen(pokeSearchViewModel)
     }
 }

app/src/main/java/com/ti/mobpo/ui/pokesearch/PokeSearchViewModel.kt

@@ -2,6 +2,8 @@ package com.ti.mobpo.ui.pokesearch
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.ti.mobpo.data.Favourite
+import com.ti.mobpo.data.FavouritesRepository
 import com.ti.mobpo.model.PokemonDetails
 import com.ti.mobpo.network.PokeApi
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -12,7 +14,7 @@ import java.io.IOException
 
 
 
-class PokeSearchViewModel : ViewModel() {
+class PokeSearchViewModel(private val favouritesRepository: FavouritesRepository) : ViewModel() {
     private val service = PokeApi.retrofitService;
 
     private val _pokemonDetails = MutableStateFlow<List<PokemonDetails>?>(null)
@@ -26,7 +28,8 @@ class PokeSearchViewModel : ViewModel() {
                 val detailsList = mutableListOf<PokemonDetails>()
                 for (pokemonSpecies in filteredList) {
                     val details = service.getPokemonDetails(extractPokemonId(pokemonSpecies.url))
-                    detailsList.add(details)
+                    val isFavorite = favouritesRepository.isFavourite(details.id)
+                    detailsList.add(details.copy(isFavorite = isFavorite))
                 }
                 _pokemonDetails.value = detailsList
             } catch (e: IOException) {
@@ -48,5 +51,17 @@ class PokeSearchViewModel : ViewModel() {
                 pokemon
             }
         }
+        viewModelScope.launch {
+            if (_pokemonDetails.value != null) {
+                val pokemon = _pokemonDetails.value!!.find { it.id == pokemonId }
+                pokemon?.let {
+                    if (it.isFavorite) {
+                        favouritesRepository.insertItem(Favourite(it.id, it.name))
+                    } else {
+                        favouritesRepository.deleteItem(Favourite(it.id, it.name))
+                    }
+                }
+            }
+        }
     }
 }

app/src/main/java/com/ti/mobpo/ui/screens/PokeSearch.kt

@@ -45,12 +45,13 @@ import androidx.lifecycle.viewmodel.compose.viewModel
 import com.ti.mobpo.model.PokemonDetails
 import coil.compose.AsyncImage
 import coil.request.ImageRequest
+import com.ti.mobpo.AppViewModelProvider
 import com.ti.mobpo.capitalizeFirstLetterAfterHyphens
 import com.ti.mobpo.ui.theme.MobileSecurityTheme
 
 @Composable
-fun PokeSearchScreen(pokeSearchViewModel: PokeSearchViewModel) {
+fun PokeSearchScreen(viewModel: PokeSearchViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
-    PokeSearch(pokeSearchViewModel)
+    PokeSearch(viewModel)
 }
 
 @Composable