Add AuthorScreen and corresponding components

Change-Id: Iee5e8bd0932d1b68770aaa1e23fa660451109601

app/build.gradle.kts

@@ -61,6 +61,7 @@ android {
 }
 
 dependencies {
+    implementation(project(":feature-author"))
     implementation(project(":feature-interests"))
     implementation(project(":feature-foryou"))
     implementation(project(":feature-topic"))

app/src/main/java/com/google/samples/apps/nowinandroid/ui/NiaNavGraph.kt

@@ -27,6 +27,10 @@ import androidx.navigation.compose.composable
 import androidx.navigation.compose.navigation
 import androidx.navigation.compose.rememberNavController
 import androidx.navigation.navArgument
+import com.google.samples.apps.nowinandroid.feature.author.AuthorDestinations
+import com.google.samples.apps.nowinandroid.feature.author.AuthorDestinationsArgs
+import com.google.samples.apps.nowinandroid.feature.author.AuthorRoute
+import com.google.samples.apps.nowinandroid.feature.author.InterestsScreens.AUTHOR_SCREEN
 import com.google.samples.apps.nowinandroid.feature.foryou.ForYouRoute
 import com.google.samples.apps.nowinandroid.feature.interests.InterestsRoute
 import com.google.samples.apps.nowinandroid.feature.topic.InterestsDestinations
@@ -69,7 +73,7 @@ fun NiaNavGraph(
             composable(InterestsDestinations.INTERESTS_DESTINATION) {
                 InterestsRoute(
                     navigateToTopic = { navController.navigate("$TOPIC_SCREEN/$it") },
-                    navigateToAuthor = { /* TO IMPLEMENT */ },
+                    navigateToAuthor = { navController.navigate("$AUTHOR_SCREEN/$it") },
                 )
             }
             composable(
@@ -82,6 +86,16 @@ fun NiaNavGraph(
             ) {
                 TopicRoute(onBackClick = { navController.popBackStack() })
             }
+            composable(
+                AuthorDestinations.AUTHOR_ROUTE,
+                arguments = listOf(
+                    navArgument(AuthorDestinationsArgs.AUTHOR_ID_ARG) {
+                        type = NavType.StringType
+                    }
+                )
+            ) {
+                AuthorRoute(onBackClick = { navController.popBackStack() })
+            }
         }
     }
 }

core-data/src/main/java/com/google/samples/apps/nowinandroid/core/data/repository/AuthorsRepository.kt

@@ -26,6 +26,11 @@ interface AuthorsRepository : Syncable {
      */
     fun getAuthorsStream(): Flow<List<Author>>
 
+    /**
+     * Gets data for a specific author
+     */
+    fun getAuthorStream(id: String): Flow<Author>
+
     /**
      * Sets the user's currently followed authors
      */

core-data/src/main/java/com/google/samples/apps/nowinandroid/core/data/repository/OfflineFirstAuthorsRepository.kt

@@ -41,6 +41,11 @@ class OfflineFirstAuthorsRepository @Inject constructor(
     private val niaPreferences: NiaPreferences,
 ) : AuthorsRepository {
 
+    override fun getAuthorStream(id: String): Flow<Author> =
+        authorDao.getAuthorEntityStream(id).map {
+            it.asExternalModel()
+        }
+
     override fun getAuthorsStream(): Flow<List<Author>> =
         authorDao.getAuthorEntitiesStream()
             .map { it.map(AuthorEntity::asExternalModel) }

core-data/src/main/java/com/google/samples/apps/nowinandroid/core/data/repository/fake/FakeAuthorsRepository.kt

@@ -29,6 +29,7 @@ import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 
@@ -60,6 +61,10 @@ class FakeAuthorsRepository @Inject constructor(
     }
         .flowOn(ioDispatcher)
 
+    override fun getAuthorStream(id: String): Flow<Author> {
+        return getAuthorsStream().map { it.first { author -> author.id == id } }
+    }
+
     override suspend fun setFollowedAuthorIds(followedAuthorIds: Set<String>) {
         niaPreferences.setFollowedAuthorIds(followedAuthorIds)
     }

core-data/src/test/java/com/google/samples/apps/nowinandroid/core/data/testdoubles/TestAuthorDao.kt

@@ -43,6 +43,10 @@ class TestAuthorDao : AuthorDao {
     override fun getAuthorEntitiesStream(): Flow<List<AuthorEntity>> =
         entitiesStateFlow
 
+    override fun getAuthorEntityStream(authorId: String): Flow<AuthorEntity> {
+        throw NotImplementedError("Unused in tests")
+    }
+
     override suspend fun insertOrIgnoreAuthors(authorEntities: List<AuthorEntity>): List<Long> {
         entitiesStateFlow.value = authorEntities
         // Assume no conflicts on insert

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/AuthorDao.kt

@@ -30,6 +30,14 @@ import kotlinx.coroutines.flow.Flow
  */
 @Dao
 interface AuthorDao {
+    @Query(
+        value = """
+        SELECT * FROM authors
+        WHERE id = :authorId
+    """
+    )
+    fun getAuthorEntityStream(authorId: String): Flow<AuthorEntity>
+
     @Query(value = "SELECT * FROM authors")
     fun getAuthorEntitiesStream(): Flow<List<AuthorEntity>>
 

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

@@ -22,6 +22,7 @@ import com.google.samples.apps.nowinandroid.core.model.data.Author
 import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.map
 
 class TestAuthorsRepository : AuthorsRepository {
     /**
@@ -38,6 +39,10 @@ class TestAuthorsRepository : AuthorsRepository {
 
     override fun getAuthorsStream(): Flow<List<Author>> = authorsFlow
 
+    override fun getAuthorStream(id: String): Flow<Author> {
+        return authorsFlow.map { authors -> authors.find { it.id == id }!! }
+    }
+
     override fun getFollowedAuthorIdsStream(): Flow<Set<String>> = _followedAuthorIds
 
     override suspend fun setFollowedAuthorIds(followedAuthorIds: Set<String>) {
@@ -56,14 +61,14 @@ class TestAuthorsRepository : AuthorsRepository {
     override suspend fun syncWith(synchronizer: Synchronizer) = true
 
     /**
-     * A test-only API to allow controlling the list of topics from tests.
+     * A test-only API to allow controlling the list of authors from tests.
      */
     fun sendAuthors(authors: List<Author>) {
         authorsFlow.tryEmit(authors)
     }
 
     /**
-     * A test-only API to allow querying the current followed topics.
+     * A test-only API to allow querying the current followed authors.
      */
     fun getCurrentFollowedAuthors(): Set<String>? = _followedAuthorIds.replayCache.firstOrNull()
 }

feature-author/.gitignore

@@ -0,0 +1 @@
+/build

feature-author/build.gradle.kts

@@ -0,0 +1,64 @@
+/*
+ * 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.
+ */
+plugins {
+    id("nowinandroid.android.library")
+    id("nowinandroid.android.library.compose")
+    id("nowinandroid.android.library.jacoco")
+    kotlin("kapt")
+    id("dagger.hilt.android.plugin")
+    id("nowinandroid.spotless")
+}
+
+android {
+    defaultConfig {
+        testInstrumentationRunner = "com.google.samples.apps.nowinandroid.core.testing.NiaTestRunner"
+    }
+}
+
+dependencies {
+    implementation(project(":core-model"))
+    implementation(project(":core-ui"))
+    implementation(project(":core-data"))
+    implementation(project(":core-common"))
+
+    testImplementation(project(":core-testing"))
+    androidTestImplementation(project(":core-testing"))
+
+    implementation(libs.coil.kt)
+    implementation(libs.coil.kt.compose)
+
+    implementation(libs.kotlinx.coroutines.android)
+    implementation(libs.kotlinx.datetime)
+
+    implementation(libs.androidx.hilt.navigation.compose)
+    implementation(libs.androidx.lifecycle.viewModelCompose)
+
+    implementation(libs.hilt.android)
+    kapt(libs.hilt.compiler)
+
+    // TODO : Remove this dependency once we upgrade to Android Studio Dolphin b/228889042
+    // These dependencies are currently necessary to render Compose previews
+    debugImplementation(libs.androidx.customview.poolingcontainer)
+
+    // androidx.test is forcing JUnit, 4.12. This forces it to use 4.13
+    configurations.configureEach {
+        resolutionStrategy {
+            force(libs.junit4)
+            // Temporary workaround for https://issuetracker.google.com/174733673
+            force("org.objenesis:objenesis:2.6")
+        }
+    }
+}