Add news resource cards to for you screen

Change-Id: Ia68950804e304ccd4a9f4ba498dd2cf383315fbd

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/model/TopicEntity.kt

@@ -36,12 +36,10 @@ data class TopicEntity(
     val id: Int,
     val name: String,
     val description: String,
-    val followed: Boolean,
 )
 
 fun TopicEntity.asExternalModel() = Topic(
     id = id,
     name = name,
     description = description,
-    followed = followed,
 )

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/model/Topic.kt

@@ -23,5 +23,4 @@ fun NetworkTopic.asEntity() = TopicEntity(
     id = id,
     name = name,
     description = description,
-    followed = followed
 )

core-domain/src/main/java/com/google/samples/apps/nowinandroid/core/domain/repository/fake/FakeNewsRepository.kt

@@ -16,14 +16,21 @@
 
 package com.google.samples.apps.nowinandroid.core.domain.repository.fake
 
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.core.database.model.asExternalModel
+import com.google.samples.apps.nowinandroid.core.domain.model.asEntity
 import com.google.samples.apps.nowinandroid.core.domain.repository.NewsRepository
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
 import com.google.samples.apps.nowinandroid.core.network.Dispatcher
 import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers.IO
+import com.google.samples.apps.nowinandroid.core.network.fake.FakeDataSource
+import com.google.samples.apps.nowinandroid.core.network.model.NetworkNewsResource
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 
 /**
@@ -38,10 +45,25 @@ class FakeNewsRepository @Inject constructor(
 ) : NewsRepository {
 
     override fun getNewsResourcesStream(): Flow<List<NewsResource>> =
-        flowOf(emptyList())
+        flow {
+            emit(
+                networkJson.decodeFromString<List<NetworkNewsResource>>(FakeDataSource.data)
+                    .map(NetworkNewsResource::asEntity)
+                    .map(NewsResourceEntity::asExternalModel)
+            )
+        }
+            .flowOn(ioDispatcher)
 
     override fun getNewsResourcesStream(filterTopicIds: Set<Int>): Flow<List<NewsResource>> =
-        flowOf(emptyList())
+        flow {
+            emit(
+                networkJson.decodeFromString<List<NetworkNewsResource>>(FakeDataSource.data)
+                    .filter { it.topics.intersect(filterTopicIds).isNotEmpty() }
+                    .map(NetworkNewsResource::asEntity)
+                    .map(NewsResourceEntity::asExternalModel)
+            )
+        }
+            .flowOn(ioDispatcher)
 
     override suspend fun sync() = true
 }

core-domain/src/test/java/com/google/samples/apps/nowinandroid/core/database/model/PopulatedNewsResourceKtTest.kt

@@ -56,7 +56,6 @@ class PopulatedNewsResourceKtTest {
                     id = 3,
                     name = "name",
                     description = "description",
-                    followed = true,
                 )
             ),
         )
@@ -83,7 +82,6 @@ class PopulatedNewsResourceKtTest {
                         id = 3,
                         name = "name",
                         description = "description",
-                        followed = true,
                     )
                 )
             ),

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/FollowableTopic.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.model.data
+
+/**
+ * A [topic] with the additional information for whether or not it is followed.
+ */
+data class FollowableTopic(
+    val topic: Topic,
+    val isFollowed: Boolean
+)

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/SaveableNewsResource.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.model.data
+
+/**
+ * A [NewsResource] with the additional information for whether it is saved.
+ */
+data class SaveableNewsResource(
+    val newsResource: NewsResource,
+    val isSaved: Boolean,
+)

core-model/src/main/java/com/google/samples/apps/nowinandroid/core/model/data/Topic.kt

@@ -23,5 +23,4 @@ data class Topic(
     val id: Int,
     val name: String,
     val description: String,
-    val followed: Boolean = false
 )

core-network/src/main/java/com/google/samples/apps/nowinandroid/core/network/fake/FakeNiANetwork.kt

@@ -24,7 +24,6 @@ import com.google.samples.apps.nowinandroid.core.network.model.NetworkTopic
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.Serializable
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 
@@ -42,14 +41,6 @@ class FakeNiANetwork @Inject constructor(
 
     override suspend fun getNewsResources(): List<NetworkNewsResource> =
         withContext(ioDispatcher) {
-            networkJson.decodeFromString<ResourceData>(FakeDataSource.data).resources
+            networkJson.decodeFromString(FakeDataSource.data)
         }
 }
-
-/**
- * Representation of resources as fetched from [FakeDataSource]
- */
-@Serializable
-private data class ResourceData(
-    val resources: List<NetworkNewsResource>
-)

core-testing/src/main/java/com/google/samples/apps/nowinandroid/core/testing/repository/TestNewsRepository.kt

@@ -18,6 +18,7 @@ package com.google.samples.apps.nowinandroid.core.testing.repository
 
 import com.google.samples.apps.nowinandroid.core.domain.repository.NewsRepository
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
@@ -37,7 +38,7 @@ class TestNewsRepository : NewsRepository {
         filterTopicIds: Set<Int>
     ): Flow<List<NewsResource>> =
         getNewsResourcesStream().map { newsResources ->
-            newsResources.filter { it.topics.intersect(filterTopicIds).isNotEmpty() }
+            newsResources.filter { it.topics.map(Topic::id).intersect(filterTopicIds).isNotEmpty() }
         }
 
     /**

core-ui/src/main/java/com/google/samples/apps/nowinandroid/core/ui/NewsResourceCard.kt

@@ -192,7 +192,6 @@ private val newsResource = NewsResource(
             id = 1,
             name = "Name",
             description = "Description",
-            followed = false
         )
     )
 )

feature-following/src/androidTest/java/com/google/samples/apps/nowinandroid/following/FollowingScreenTest.kt

@@ -24,6 +24,7 @@ import androidx.compose.ui.test.onAllNodesWithContentDescription
 import androidx.compose.ui.test.onAllNodesWithText
 import androidx.compose.ui.test.onNodeWithContentDescription
 import androidx.compose.ui.test.onNodeWithText
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import com.google.samples.apps.nowinandroid.feature.following.FollowingScreen
 import com.google.samples.apps.nowinandroid.feature.following.FollowingUiState
@@ -110,7 +111,7 @@ class FollowingScreenTest {
 
         composeTestRule
             .onAllNodesWithContentDescription(followingTopicCardUnfollowButton)
-            .assertCountEquals(testTopics.filter { it.followed }.size)
+            .assertCountEquals(testTopics.filter { it.isFollowed }.size)
     }
 
     @Test
@@ -135,22 +136,30 @@ private const val TOPIC_3_NAME = "Tools"
 private const val TOPIC_DESC = "At vero eos et accusamus et iusto odio dignissimos ducimus qui."
 
 private val testTopics = listOf(
-    Topic(
-        id = 0,
-        name = TOPIC_1_NAME,
-        description = TOPIC_DESC,
-        followed = true
+    FollowableTopic(
+        Topic(
+            id = 0,
+            name = TOPIC_1_NAME,
+            description = TOPIC_DESC,
+        ),
+        isFollowed = true
     ),
-    Topic(
-        id = 1,
-        name = TOPIC_2_NAME,
-        description = TOPIC_DESC
+    FollowableTopic(
+        Topic(
+            id = 1,
+            name = TOPIC_2_NAME,
+            description = TOPIC_DESC
+        ),
+        isFollowed = false
     ),
-    Topic(
-        id = 2,
-        name = TOPIC_3_NAME,
-        description = TOPIC_DESC
+    FollowableTopic(
+        Topic(
+            id = 2,
+            name = TOPIC_3_NAME,
+            description = TOPIC_DESC
+        ),
+        isFollowed = false
     )
 )
 
-private val numberOfUnfollowedTopics = testTopics.filter { !it.followed }.size
+private val numberOfUnfollowedTopics = testTopics.filter { !it.isFollowed }.size

feature-following/src/main/java/com/google/samples/apps/nowinandroid/feature/following/FollowingScreen.kt

@@ -45,6 +45,7 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import com.google.samples.apps.nowinandroid.core.ui.NiaLoadingIndicator
 import com.google.samples.apps.nowinandroid.core.ui.NiaToolbar
@@ -105,10 +106,10 @@ fun FollowingWithTopicsScreen(
     LazyColumn(
         modifier = modifier
     ) {
-        uiState.topics.forEach {
+        uiState.topics.forEach { followableTopic ->
             item {
                 FollowingTopicCard(
-                    topic = it,
+                    followableTopic = followableTopic,
                     onTopicClick = onTopicClick,
                     onFollowButtonClick = onFollowButtonClick
                 )
@@ -124,7 +125,7 @@ fun FollowingErrorScreen() {
 
 @Composable
 fun FollowingTopicCard(
-    topic: Topic,
+    followableTopic: FollowableTopic,
     onTopicClick: () -> Unit,
     onFollowButtonClick: (Int, Boolean) -> Unit,
 ) {
@@ -147,13 +148,13 @@ fun FollowingTopicCard(
                 .weight(1f)
                 .clickable { onTopicClick() }
         ) {
-            TopicTitle(topicName = topic.name)
-            TopicDescription(topicDescription = topic.description)
+            TopicTitle(topicName = followableTopic.topic.name)
+            TopicDescription(topicDescription = followableTopic.topic.description)
         }
         FollowButton(
-            topicId = topic.id,
+            topicId = followableTopic.topic.id,
             onClick = onFollowButtonClick,
-            isFollowed = topic.followed
+            isFollowed = followableTopic.isFollowed
         )
     }
 }
@@ -244,10 +245,13 @@ fun TopicCardPreview() {
     NiaTheme {
         Surface {
             FollowingTopicCard(
-                Topic(
-                    id = 0,
-                    name = "Compose",
-                    description = "Description"
+                FollowableTopic(
+                    Topic(
+                        id = 0,
+                        name = "Compose",
+                        description = "Description"
+                    ),
+                    isFollowed = false
                 ),
                 onTopicClick = {},
                 onFollowButtonClick = { _, _ -> }

feature-following/src/main/java/com/google/samples/apps/nowinandroid/feature/following/FollowingViewModel.kt

@@ -19,6 +19,7 @@ package com.google.samples.apps.nowinandroid.feature.following
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.google.samples.apps.nowinandroid.core.domain.repository.TopicsRepository
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
@@ -39,10 +40,10 @@ class FollowingViewModel @Inject constructor(
 ) : ViewModel() {
 
     private val followedTopicIdsStream = topicsRepository.getFollowedTopicIdsStream()
-        .catch { FollowingState.Error }
-        .map { followedTopics ->
+        .map<Set<Int>, FollowingState> { followedTopics ->
             FollowingState.Topics(topics = followedTopics)
         }
+        .catch { emit(FollowingState.Error) }
 
     val uiState: StateFlow<FollowingUiState> = combine(
         followedTopicIdsStream,
@@ -70,15 +71,14 @@ class FollowingViewModel @Inject constructor(
     private fun mapFollowedAndUnfollowedTopics(topics: List<Topic>): Flow<FollowingUiState.Topics> =
         topicsRepository.getFollowedTopicIdsStream().map { followedTopicIds ->
             FollowingUiState.Topics(
-                topics =
-                topics.map {
-                    Topic(
-                        it.id,
-                        it.name,
-                        it.description,
-                        followedTopicIds.contains(it.id)
-                    )
-                }.sortedBy { it.name }
+                topics = topics
+                    .map { topic ->
+                        FollowableTopic(
+                            topic = topic,
+                            isFollowed = topic.id in followedTopicIds,
+                        )
+                    }
+                    .sortedBy { it.topic.name }
             )
         }
 }
@@ -90,6 +90,6 @@ private sealed interface FollowingState {
 
 sealed interface FollowingUiState {
     object Loading : FollowingUiState
-    data class Topics(val topics: List<Topic>) : FollowingUiState
+    data class Topics(val topics: List<FollowableTopic>) : FollowingUiState
     object Error : FollowingUiState
 }

feature-following/src/test/java/com/google/samples/apps/nowinandroid/following/FollowingViewModelTest.kt

@@ -17,6 +17,7 @@
 package com.google.samples.apps.nowinandroid.following
 
 import app.cash.turbine.test
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestTopicsRepository
 import com.google.samples.apps.nowinandroid.core.testing.util.TestDispatcherRule
@@ -63,13 +64,13 @@ class FollowingViewModelTest {
         viewModel.uiState
             .test {
                 awaitItem()
-                topicsRepository.sendTopics(testInputTopics)
-                topicsRepository.setFollowedTopicIds(setOf(testInputTopics[0].id))
+                topicsRepository.sendTopics(testInputTopics.map { it.topic })
+                topicsRepository.setFollowedTopicIds(setOf(testInputTopics[0].topic.id))
 
                 awaitItem()
                 viewModel.followTopic(
-                    followedTopicId = testInputTopics[1].id,
-                    followed = !testInputTopics[1].followed
+                    followedTopicId = testInputTopics[1].topic.id,
+                    followed = true
                 )
 
                 assertEquals(
@@ -85,19 +86,21 @@ class FollowingViewModelTest {
         viewModel.uiState
             .test {
                 awaitItem()
-                topicsRepository.sendTopics(testOutputTopics)
+                topicsRepository.sendTopics(testOutputTopics.map { it.topic })
                 topicsRepository.setFollowedTopicIds(
-                    setOf(testOutputTopics[0].id, testOutputTopics[1].id)
+                    setOf(testOutputTopics[0].topic.id, testOutputTopics[1].topic.id)
                 )
 
                 awaitItem()
                 viewModel.followTopic(
-                    followedTopicId = testOutputTopics[1].id,
-                    followed = !testOutputTopics[1].followed
+                    followedTopicId = testOutputTopics[1].topic.id,
+                    followed = false
                 )
 
                 assertEquals(
-                    FollowingUiState.Topics(topics = testInputTopics),
+                    FollowingUiState.Topics(
+                        topics = testInputTopics
+                    ),
                     awaitItem()
                 )
                 cancel()
@@ -111,41 +114,55 @@ private const val TOPIC_3_NAME = "Compose"
 private const val TOPIC_DESC = "At vero eos et accusamus et iusto odio dignissimos ducimus qui."
 
 private val testInputTopics = listOf(
-    Topic(
-        id = 0,
-        name = TOPIC_1_NAME,
-        description = TOPIC_DESC,
-        followed = true
+    FollowableTopic(
+        Topic(
+            id = 0,
+            name = TOPIC_1_NAME,
+            description = TOPIC_DESC,
+        ),
+        isFollowed = true
     ),
-    Topic(
-        id = 1,
-        name = TOPIC_2_NAME,
-        description = TOPIC_DESC
+    FollowableTopic(
+        Topic(
+            id = 1,
+            name = TOPIC_2_NAME,
+            description = TOPIC_DESC
+        ),
+        isFollowed = false
     ),
-    Topic(
-        id = 2,
-        name = TOPIC_3_NAME,
-        description = TOPIC_DESC
+    FollowableTopic(
+        Topic(
+            id = 2,
+            name = TOPIC_3_NAME,
+            description = TOPIC_DESC
+        ),
+        isFollowed = false
     )
 )
 
 private val testOutputTopics = listOf(
-    Topic(
-        id = 0,
-        name = TOPIC_1_NAME,
-        description = TOPIC_DESC,
-        followed = true
+    FollowableTopic(
+        Topic(
+            id = 0,
+            name = TOPIC_1_NAME,
+            description = TOPIC_DESC,
+        ),
+        isFollowed = true
     ),
-    Topic(
-        id = 1,
-        name = TOPIC_2_NAME,
-        description = TOPIC_DESC,
-        followed = true
+    FollowableTopic(
+        Topic(
+            id = 1,
+            name = TOPIC_2_NAME,
+            description = TOPIC_DESC
+        ),
+        isFollowed = true
     ),
-    Topic(
-        id = 2,
-        name = TOPIC_3_NAME,
-        description = TOPIC_DESC,
-        followed = false,
+    FollowableTopic(
+        Topic(
+            id = 2,
+            name = TOPIC_3_NAME,
+            description = TOPIC_DESC
+        ),
+        isFollowed = false
     )
 )

feature-foryou/build.gradle

@@ -53,6 +53,7 @@ dependencies {
     androidTestImplementation project(':core-testing')
 
     implementation libs.kotlinx.coroutines.android
+    implementation libs.kotlinx.datetime
 
     implementation libs.androidx.hilt.navigation.compose
     implementation libs.androidx.lifecycle.viewModelCompose

feature-foryou/src/androidTest/java/com/google/samples/apps/nowinandroid/feature/foryou/ForYouScreenTest.kt

@@ -26,6 +26,7 @@ import androidx.compose.ui.test.assertIsOn
 import androidx.compose.ui.test.junit4.createAndroidComposeRule
 import androidx.compose.ui.test.onNodeWithContentDescription
 import androidx.compose.ui.test.onNodeWithText
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import org.junit.Rule
 import org.junit.Test
@@ -40,7 +41,8 @@ class ForYouScreenTest {
             ForYouScreen(
                 uiState = ForYouFeedUiState.Loading,
                 onTopicCheckedChanged = { _, _ -> },
-                saveFollowedTopics = {}
+                saveFollowedTopics = {},
+                onNewsResourcesCheckedChanged = { _, _ -> }
             )
         }
 
@@ -56,27 +58,37 @@ class ForYouScreenTest {
         composeTestRule.setContent {
             ForYouScreen(
                 uiState = ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-                    selectedTopics = listOf(
-                        Topic(
-                            id = 0,
-                            name = "Headlines",
-                            description = ""
-                        ) to false,
-                        Topic(
-                            id = 1,
-                            name = "UI",
-                            description = ""
-                        ) to false,
-                        Topic(
-                            id = 2,
-                            name = "Tools",
-                            description = ""
-                        ) to false
+                    topics = listOf(
+                        FollowableTopic(
+                            topic = Topic(
+                                id = 0,
+                                name = "Headlines",
+                                description = ""
+                            ),
+                            isFollowed = false
+                        ),
+                        FollowableTopic(
+                            topic = Topic(
+                                id = 1,
+                                name = "UI",
+                                description = ""
+                            ),
+                            isFollowed = false
+                        ),
+                        FollowableTopic(
+                            topic = Topic(
+                                id = 2,
+                                name = "Tools",
+                                description = "",
+                            ),
+                            isFollowed = false
+                        ),
                     ),
                     feed = emptyList()
                 ),
                 onTopicCheckedChanged = { _, _ -> },
-                saveFollowedTopics = {}
+                saveFollowedTopics = {},
+                onNewsResourcesCheckedChanged = { _, _ -> }
             )
         }
 
@@ -110,27 +122,37 @@ class ForYouScreenTest {
         composeTestRule.setContent {
             ForYouScreen(
                 uiState = ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-                    selectedTopics = listOf(
-                        Topic(
-                            id = 0,
-                            name = "Headlines",
-                            description = ""
-                        ) to false,
-                        Topic(
-                            id = 1,
-                            name = "UI",
-                            description = ""
-                        ) to true,
-                        Topic(
-                            id = 2,
-                            name = "Tools",
-                            description = ""
-                        ) to false
+                    topics = listOf(
+                        FollowableTopic(
+                            topic = Topic(
+                                id = 0,
+                                name = "Headlines",
+                                description = ""
+                            ),
+                            isFollowed = false
+                        ),
+                        FollowableTopic(
+                            topic = Topic(
+                                id = 1,
+                                name = "UI",
+                                description = ""
+                            ),
+                            isFollowed = true
+                        ),
+                        FollowableTopic(
+                            topic = Topic(
+                                id = 2,
+                                name = "Tools",
+                                description = "",
+                            ),
+                            isFollowed = false
+                        ),
                     ),
                     feed = emptyList()
                 ),
                 onTopicCheckedChanged = { _, _ -> },
-                saveFollowedTopics = {}
+                saveFollowedTopics = {},
+                onNewsResourcesCheckedChanged = { _, _ -> }
             )
         }
 

feature-foryou/src/main/java/com/google/samples/apps/nowinandroid/feature/foryou/ForYouScreen.kt

@@ -22,6 +22,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListScope
+import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.selection.toggleable
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Button
@@ -39,8 +40,14 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import com.google.accompanist.flowlayout.FlowRow
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Video
+import com.google.samples.apps.nowinandroid.core.model.data.SaveableNewsResource
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
+import com.google.samples.apps.nowinandroid.core.ui.NewsResourceCardExpanded
 import com.google.samples.apps.nowinandroid.core.ui.NiaLoadingIndicator
+import kotlinx.datetime.Instant
 
 @Composable
 fun ForYouRoute(
@@ -53,7 +60,8 @@ fun ForYouRoute(
         modifier = modifier,
         uiState = uiState,
         onTopicCheckedChanged = viewModel::updateTopicSelection,
-        saveFollowedTopics = viewModel::saveFollowedTopics
+        saveFollowedTopics = viewModel::saveFollowedTopics,
+        onNewsResourcesCheckedChanged = viewModel::updateNewsResourceSaved
     )
 }
 
@@ -62,6 +70,7 @@ fun ForYouScreen(
     uiState: ForYouFeedUiState,
     onTopicCheckedChanged: (Int, Boolean) -> Unit,
     saveFollowedTopics: () -> Unit,
+    onNewsResourcesCheckedChanged: (Int, Boolean) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     Box(modifier = modifier.fillMaxSize()) {
@@ -81,9 +90,15 @@ fun ForYouScreen(
                         is ForYouFeedUiState.PopulatedFeed.FeedWithoutTopicSelection -> Unit
                     }
 
-//                    items(uiState.feed) { _: NewsResource ->
-//                        // TODO: News item
-//                    }
+                    items(uiState.feed) { (newsResource: NewsResource, isBookmarked: Boolean) ->
+                        NewsResourceCardExpanded(
+                            newsResource = newsResource,
+                            isBookmarked = isBookmarked,
+                            onToggleBookmark = {
+                                onNewsResourcesCheckedChanged(newsResource.id, !isBookmarked)
+                            }
+                        )
+                    }
                 }
             }
         }
@@ -104,7 +119,7 @@ private fun LazyListScope.TopicSelection(
             crossAxisSpacing = 8.dp,
             modifier = Modifier.padding(horizontal = 40.dp)
         ) {
-            uiState.selectedTopics.forEach { (topic, isSelected) ->
+            uiState.topics.forEach { (topic, isSelected) ->
                 key(topic.id) {
                     // TODO: Add toggleable semantics
                     OutlinedButton(
@@ -149,7 +164,8 @@ fun ForYouScreenLoading() {
     ForYouScreen(
         uiState = ForYouFeedUiState.Loading,
         onTopicCheckedChanged = { _, _ -> },
-        saveFollowedTopics = {}
+        saveFollowedTopics = {},
+        onNewsResourcesCheckedChanged = { _, _ -> }
     )
 }
 
@@ -158,27 +174,104 @@ fun ForYouScreenLoading() {
 fun ForYouScreenTopicSelection() {
     ForYouScreen(
         uiState = ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-            selectedTopics = listOf(
-                Topic(
-                    id = 0,
-                    name = "Headlines",
-                    description = ""
-                ) to false,
-                Topic(
-                    id = 1,
-                    name = "UI",
-                    description = ""
-                ) to true,
-                Topic(
-                    id = 2,
-                    name = "Tools",
-                    description = ""
-                ) to false
+            topics = listOf(
+                FollowableTopic(
+                    topic = Topic(
+                        id = 0,
+                        name = "Headlines",
+                        description = ""
+                    ),
+                    isFollowed = false
+                ),
+                FollowableTopic(
+                    topic = Topic(
+                        id = 1,
+                        name = "UI",
+                        description = ""
+                    ),
+                    isFollowed = false
+                ),
+                FollowableTopic(
+                    topic = Topic(
+                        id = 2,
+                        name = "Tools",
+                        description = "",
+                    ),
+                    isFollowed = false
+                ),
             ),
-            feed = emptyList()
+            feed = listOf(
+                SaveableNewsResource(
+                    newsResource = NewsResource(
+                        id = 1,
+                        episodeId = 52,
+                        title = "Thanks for helping us reach 1M YouTube Subscribers",
+                        content = "Thank you everyone for following the Now in Android series " +
+                            "and everything the Android Developers YouTube channel has to offer. " +
+                            "During the Android Developer Summit, our YouTube channel reached 1 " +
+                            "million subscribers! Here’s a small video to thank you all.",
+                        url = "https://youtu.be/-fJ6poHQrjM",
+                        publishDate = Instant.parse("2021-11-09T00:00:00.000Z"),
+                        type = Video,
+                        topics = listOf(
+                            Topic(
+                                id = 0,
+                                name = "Headlines",
+                                description = ""
+                            )
+                        ),
+                        authors = emptyList()
+                    ),
+                    isSaved = false
+                ),
+                SaveableNewsResource(
+                    newsResource = NewsResource(
+                        id = 2,
+                        episodeId = 52,
+                        title = "Transformations and customisations in the Paging Library",
+                        content = "A demonstration of different operations that can be performed " +
+                            "with Paging. Transformations like inserting separators, when to " +
+                            "create a new pager, and customisation options for consuming " +
+                            "PagingData.",
+                        url = "https://youtu.be/ZARz0pjm5YM",
+                        publishDate = Instant.parse("2021-11-01T00:00:00.000Z"),
+                        type = Video,
+                        topics = listOf(
+                            Topic(
+                                id = 1,
+                                name = "UI",
+                                description = ""
+                            ),
+                        ),
+                        authors = emptyList()
+                    ),
+                    isSaved = false
+                ),
+                SaveableNewsResource(
+                    newsResource = NewsResource(
+                        id = 3,
+                        episodeId = 52,
+                        title = "Community tip on Paging",
+                        content = "Tips for using the Paging library from the developer community",
+                        url = "https://youtu.be/r5JgIyS3t3s",
+                        publishDate = Instant.parse("2021-11-08T00:00:00.000Z"),
+                        type = Video,
+                        topics = listOf(
+                            Topic(
+                                id = 1,
+                                name = "UI",
+                                description = ""
+                            ),
+                        ),
+                        authors = emptyList()
+                    ),
+                    isSaved = false
+                ),
+            )
         ),
         onTopicCheckedChanged = { _, _ -> },
-        saveFollowedTopics = {}
+        saveFollowedTopics = {},
+        onNewsResourcesCheckedChanged = { _, _ -> }
     )
 }
 
@@ -190,6 +283,7 @@ fun PopulatedFeed() {
             feed = emptyList()
         ),
         onTopicCheckedChanged = { _, _ -> },
-        saveFollowedTopics = {}
+        saveFollowedTopics = {},
+        onNewsResourcesCheckedChanged = { _, _ -> }
     )
 }

feature-foryou/src/main/java/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModel.kt

@@ -24,8 +24,9 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.google.samples.apps.nowinandroid.core.domain.repository.NewsRepository
 import com.google.samples.apps.nowinandroid.core.domain.repository.TopicsRepository
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
-import com.google.samples.apps.nowinandroid.core.model.data.Topic
+import com.google.samples.apps.nowinandroid.core.model.data.SaveableNewsResource
 import com.google.samples.apps.nowinandroid.feature.foryou.util.saveable
 import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
@@ -51,7 +52,7 @@ class ForYouViewModel @Inject constructor(
                 FollowedTopicsState.None
             } else {
                 FollowedTopicsState.FollowedTopics(
-                    topics = followedTopics
+                    topicIds = followedTopics
                 )
             }
         }
@@ -61,6 +62,16 @@ class ForYouViewModel @Inject constructor(
             initialValue = FollowedTopicsState.Unknown
         )
 
+    /**
+     * TODO: Temporary saving of news resources persisted through process death with a
+     *       [SavedStateHandle].
+     *
+     * This should be persisted to disk instead.
+     */
+    private var savedNewsResources by savedStateHandle.saveable {
+        mutableStateOf<Set<Int>>(emptySet())
+    }
+
     /**
      * The in-progress set of topics to be selected, persisted through process death with a
      * [SavedStateHandle].
@@ -73,15 +84,26 @@ class ForYouViewModel @Inject constructor(
         followedTopicsStateFlow,
         topicsRepository.getTopicsStream(),
         snapshotFlow { inProgressTopicSelection },
-    ) { followedTopicsUserState, availableTopics, inProgressTopicSelection ->
+        snapshotFlow { savedNewsResources }
+    ) { followedTopicsUserState, availableTopics, inProgressTopicSelection, savedNewsResources ->
+
+        fun mapToSaveableFeed(feed: List<NewsResource>): List<SaveableNewsResource> =
+            feed.map { newsResource ->
+                SaveableNewsResource(
+                    newsResource = newsResource,
+                    isSaved = savedNewsResources.contains(newsResource.id)
+                )
+            }
+
         when (followedTopicsUserState) {
             // If we don't know the current selection state, just emit loading.
             FollowedTopicsState.Unknown -> flowOf<ForYouFeedUiState>(ForYouFeedUiState.Loading)
             // If the user has followed topics, use those followed topics to populate the feed
             is FollowedTopicsState.FollowedTopics -> {
                 newsRepository.getNewsResourcesStream(
-                    filterTopicIds = followedTopicsUserState.topics
+                    filterTopicIds = followedTopicsUserState.topicIds
                 )
+                    .map(::mapToSaveableFeed)
                     .map { feed ->
                         ForYouFeedUiState.PopulatedFeed.FeedWithoutTopicSelection(
                             feed = feed
@@ -94,10 +116,14 @@ class ForYouViewModel @Inject constructor(
                 newsRepository.getNewsResourcesStream(
                     filterTopicIds = inProgressTopicSelection
                 )
+                    .map(::mapToSaveableFeed)
                     .map { feed ->
                         ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-                            selectedTopics = availableTopics.map { topic ->
-                                topic to (topic.id in inProgressTopicSelection)
+                            topics = availableTopics.map { topic ->
+                                FollowableTopic(
+                                    topic = topic,
+                                    isFollowed = topic.id in inProgressTopicSelection
+                                )
                             },
                             feed = feed
                         )
@@ -127,6 +153,17 @@ class ForYouViewModel @Inject constructor(
         }
     }
 
+    fun updateNewsResourceSaved(newsResourceId: Int, isChecked: Boolean) {
+        withMutableSnapshot {
+            savedNewsResources =
+                if (isChecked) {
+                    savedNewsResources + newsResourceId
+                } else {
+                    savedNewsResources - newsResourceId
+                }
+        }
+    }
+
     fun saveFollowedTopics() {
         if (inProgressTopicSelection.isEmpty()) return
 
@@ -152,10 +189,10 @@ private sealed interface FollowedTopicsState {
     object None : FollowedTopicsState
 
     /**
-     * The user has followed the given (non-empty) set of [topics].
+     * The user has followed the given (non-empty) set of [topicIds].
      */
     data class FollowedTopics(
-        val topics: Set<Int>,
+        val topicIds: Set<Int>,
     ) : FollowedTopicsState
 }
 
@@ -177,23 +214,23 @@ sealed interface ForYouFeedUiState {
         /**
          * The list of news resources contained in this [PopulatedFeed].
          */
-        val feed: List<NewsResource>
+        val feed: List<SaveableNewsResource>
 
         /**
          * The feed, along with a list of topics that can be selected.
          */
         data class FeedWithTopicSelection(
-            val selectedTopics: List<Pair<Topic, Boolean>>,
-            override val feed: List<NewsResource>
+            val topics: List<FollowableTopic>,
+            override val feed: List<SaveableNewsResource>
         ) : PopulatedFeed {
-            val canSaveSelectedTopics: Boolean = selectedTopics.any { it.second }
+            val canSaveSelectedTopics: Boolean = topics.any { it.isFollowed }
         }
 
         /**
          * Just the feed.
          */
         data class FeedWithoutTopicSelection(
-            override val feed: List<NewsResource>
+            override val feed: List<SaveableNewsResource>
         ) : PopulatedFeed
     }
 }

feature-foryou/src/test/java/com/google/samples/apps/nowinandroid/feature/foryou/ForYouViewModelTest.kt

@@ -18,11 +18,16 @@ package com.google.samples.apps.nowinandroid.feature.foryou
 
 import androidx.lifecycle.SavedStateHandle
 import app.cash.turbine.test
+import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Video
+import com.google.samples.apps.nowinandroid.core.model.data.SaveableNewsResource
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestNewsRepository
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestTopicsRepository
 import com.google.samples.apps.nowinandroid.core.testing.util.TestDispatcherRule
 import kotlinx.coroutines.test.runTest
+import kotlinx.datetime.Instant
 import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Rule
@@ -91,26 +96,35 @@ class ForYouViewModelTest {
                 awaitItem()
                 topicsRepository.sendTopics(sampleTopics)
                 topicsRepository.setFollowedTopicIds(emptySet())
-                newsRepository.sendNewsResources(emptyList())
+                newsRepository.sendNewsResources(sampleNewsResources)
 
                 assertEquals(
                     ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-                        selectedTopics = listOf(
-                            Topic(
-                                id = 0,
-                                name = "Headlines",
-                                description = ""
-                            ) to false,
-                            Topic(
-                                id = 1,
-                                name = "UI",
-                                description = ""
-                            ) to false,
-                            Topic(
-                                id = 2,
-                                name = "Tools",
-                                description = "",
-                            ) to false
+                        topics = listOf(
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 0,
+                                    name = "Headlines",
+                                    description = ""
+                                ),
+                                isFollowed = false
+                            ),
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 1,
+                                    name = "UI",
+                                    description = ""
+                                ),
+                                isFollowed = false
+                            ),
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 2,
+                                    name = "Tools",
+                                    description = "",
+                                ),
+                                isFollowed = false
+                            ),
                         ),
                         feed = emptyList()
                     ),
@@ -127,11 +141,16 @@ class ForYouViewModelTest {
                 awaitItem()
                 topicsRepository.sendTopics(sampleTopics)
                 topicsRepository.setFollowedTopicIds(setOf(0, 1))
-                newsRepository.sendNewsResources(emptyList())
+                newsRepository.sendNewsResources(sampleNewsResources)
 
                 assertEquals(
                     ForYouFeedUiState.PopulatedFeed.FeedWithoutTopicSelection(
-                        feed = emptyList()
+                        feed = sampleNewsResources.map {
+                            SaveableNewsResource(
+                                newsResource = it,
+                                isSaved = false
+                            )
+                        }
                     ),
                     awaitItem()
                 )
@@ -146,31 +165,49 @@ class ForYouViewModelTest {
                 awaitItem()
                 topicsRepository.sendTopics(sampleTopics)
                 topicsRepository.setFollowedTopicIds(emptySet())
-                newsRepository.sendNewsResources(emptyList())
+                newsRepository.sendNewsResources(sampleNewsResources)
 
                 awaitItem()
                 viewModel.updateTopicSelection(1, isChecked = true)
 
                 assertEquals(
                     ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-                        selectedTopics = listOf(
-                            Topic(
-                                id = 0,
-                                name = "Headlines",
-                                description = ""
-                            ) to false,
-                            Topic(
-                                id = 1,
-                                name = "UI",
-                                description = ""
-                            ) to true,
-                            Topic(
-                                id = 2,
-                                name = "Tools",
-                                description = ""
-                            ) to false
+                        topics = listOf(
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 0,
+                                    name = "Headlines",
+                                    description = ""
+                                ),
+                                isFollowed = false
+                            ),
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 1,
+                                    name = "UI",
+                                    description = ""
+                                ),
+                                isFollowed = true
+                            ),
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 2,
+                                    name = "Tools",
+                                    description = "",
+                                ),
+                                isFollowed = false
+                            )
                         ),
-                        feed = emptyList()
+                        feed = listOf(
+                            SaveableNewsResource(
+                                newsResource = sampleNewsResources[1],
+                                isSaved = false
+                            ),
+                            SaveableNewsResource(
+                                newsResource = sampleNewsResources[2],
+                                isSaved = false
+                            )
+                        )
                     ),
                     awaitItem()
                 )
@@ -185,7 +222,7 @@ class ForYouViewModelTest {
                 awaitItem()
                 topicsRepository.sendTopics(sampleTopics)
                 topicsRepository.setFollowedTopicIds(emptySet())
-                newsRepository.sendNewsResources(emptyList())
+                newsRepository.sendNewsResources(sampleNewsResources)
 
                 awaitItem()
                 viewModel.updateTopicSelection(1, isChecked = true)
@@ -195,22 +232,31 @@ class ForYouViewModelTest {
 
                 assertEquals(
                     ForYouFeedUiState.PopulatedFeed.FeedWithTopicSelection(
-                        selectedTopics = listOf(
-                            Topic(
-                                id = 0,
-                                name = "Headlines",
-                                description = ""
-                            ) to false,
-                            Topic(
-                                id = 1,
-                                name = "UI",
-                                description = ""
-                            ) to false,
-                            Topic(
-                                id = 2,
-                                name = "Tools",
-                                description = ""
-                            ) to false
+                        topics = listOf(
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 0,
+                                    name = "Headlines",
+                                    description = ""
+                                ),
+                                isFollowed = false
+                            ),
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 1,
+                                    name = "UI",
+                                    description = ""
+                                ),
+                                isFollowed = false
+                            ),
+                            FollowableTopic(
+                                topic = Topic(
+                                    id = 2,
+                                    name = "Tools",
+                                    description = "",
+                                ),
+                                isFollowed = false
+                            )
                         ),
                         feed = emptyList()
                     ),
@@ -227,7 +273,7 @@ class ForYouViewModelTest {
                 awaitItem()
                 topicsRepository.sendTopics(sampleTopics)
                 topicsRepository.setFollowedTopicIds(emptySet())
-                newsRepository.sendNewsResources(emptyList())
+                newsRepository.sendNewsResources(sampleNewsResources)
 
                 awaitItem()
                 viewModel.updateTopicSelection(1, isChecked = true)
@@ -237,7 +283,16 @@ class ForYouViewModelTest {
 
                 assertEquals(
                     ForYouFeedUiState.PopulatedFeed.FeedWithoutTopicSelection(
-                        feed = emptyList()
+                        feed = listOf(
+                            SaveableNewsResource(
+                                newsResource = sampleNewsResources[1],
+                                isSaved = false
+                            ),
+                            SaveableNewsResource(
+                                newsResource = sampleNewsResources[2],
+                                isSaved = false
+                            )
+                        )
                     ),
                     awaitItem()
                 )
@@ -245,6 +300,35 @@ class ForYouViewModelTest {
                 cancel()
             }
     }
+
+    @Test
+    fun newsResourceSelectionUpdatesAfterLoadingFollowedTopics() = runTest {
+        viewModel.uiState
+            .test {
+                awaitItem()
+                topicsRepository.sendTopics(sampleTopics)
+                topicsRepository.setFollowedTopicIds(setOf(1))
+                newsRepository.sendNewsResources(sampleNewsResources)
+                viewModel.updateNewsResourceSaved(2, true)
+
+                assertEquals(
+                    ForYouFeedUiState.PopulatedFeed.FeedWithoutTopicSelection(
+                        feed = listOf(
+                            SaveableNewsResource(
+                                newsResource = sampleNewsResources[1],
+                                isSaved = true
+                            ),
+                            SaveableNewsResource(
+                                newsResource = sampleNewsResources[2],
+                                isSaved = false
+                            )
+                        )
+                    ),
+                    awaitItem()
+                )
+                cancel()
+            }
+    }
 }
 
 private val sampleTopics = listOf(
@@ -264,3 +348,62 @@ private val sampleTopics = listOf(
         description = ""
     )
 )
+
+private val sampleNewsResources = listOf(
+    NewsResource(
+        id = 1,
+        episodeId = 52,
+        title = "Thanks for helping us reach 1M YouTube Subscribers",
+        content = "Thank you everyone for following the Now in Android series and everything the " +
+            "Android Developers YouTube channel has to offer. During the Android Developer " +
+            "Summit, our YouTube channel reached 1 million subscribers! Here’s a small video to " +
+            "thank you all.",
+        url = "https://youtu.be/-fJ6poHQrjM",
+        publishDate = Instant.parse("2021-11-09T00:00:00.000Z"),
+        type = Video,
+        topics = listOf(
+            Topic(
+                id = 0,
+                name = "Headlines",
+                description = ""
+            )
+        ),
+        authors = emptyList()
+    ),
+    NewsResource(
+        id = 2,
+        episodeId = 52,
+        title = "Transformations and customisations in the Paging Library",
+        content = "A demonstration of different operations that can be performed with Paging. " +
+            "Transformations like inserting separators, when to create a new pager, and " +
+            "customisation options for consuming PagingData.",
+        url = "https://youtu.be/ZARz0pjm5YM",
+        publishDate = Instant.parse("2021-11-01T00:00:00.000Z"),
+        type = Video,
+        topics = listOf(
+            Topic(
+                id = 1,
+                name = "UI",
+                description = ""
+            ),
+        ),
+        authors = emptyList()
+    ),
+    NewsResource(
+        id = 3,
+        episodeId = 52,
+        title = "Community tip on Paging",
+        content = "Tips for using the Paging library from the developer community",
+        url = "https://youtu.be/r5JgIyS3t3s",
+        publishDate = Instant.parse("2021-11-08T00:00:00.000Z"),
+        type = Video,
+        topics = listOf(
+            Topic(
+                id = 1,
+                name = "UI",
+                description = ""
+            ),
+        ),
+        authors = emptyList()
+    ),
+)