Merge pull request #43 from Skrilltrax/develop

app/src/main/java/dev/msfjarvis/lobsters/MainActivity.kt

@@ -5,16 +5,24 @@ import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.foundation.Text
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumnForIndexed
+import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material.FloatingActionButton
+import androidx.compose.material.IconToggleButton
+import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Scaffold
+import androidx.compose.material.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.Providers
 import androidx.compose.runtime.ambientOf
 import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.setContent
@@ -23,8 +31,10 @@ import androidx.compose.ui.unit.dp
 import dagger.hilt.android.AndroidEntryPoint
 import dev.msfjarvis.lobsters.compose.utils.IconResource
 import dev.msfjarvis.lobsters.data.LobstersViewModel
+import dev.msfjarvis.lobsters.model.LobstersPost
 import dev.msfjarvis.lobsters.ui.LobstersItem
 import dev.msfjarvis.lobsters.ui.LobstersTheme
+import dev.msfjarvis.lobsters.ui.savedTitleColor
 import dev.msfjarvis.lobsters.urllauncher.UrlLauncher
 import javax.inject.Inject
 
@@ -52,40 +62,128 @@ fun LobstersApp(
   viewModel: LobstersViewModel
 ) {
   val urlLauncher = UrlLauncherAmbient.current
-  val state = viewModel.posts.collectAsState()
-  val lastIndex = state.value.lastIndex
+  val posts = viewModel.posts.collectAsState()
+  val savedPosts = viewModel.savedPosts.collectAsState()
+  val lastIndex = posts.value.lastIndex
+  val showSaved = remember { mutableStateOf(false) }
 
   Scaffold(
+    topBar = {
+      LobstersTopAppBar(showSaved.value) {
+        showSaved.value = !showSaved.value
+      }
+    },
     bodyContent = {
-      if (state.value.isEmpty()) {
-        Column(
-          modifier = Modifier.fillMaxSize(),
-          verticalArrangement = Arrangement.Center,
-          horizontalAlignment = Alignment.CenterHorizontally,
-        ) {
-          IconResource(R.drawable.ic_sync_problem_24px)
-          Text(stringResource(R.string.loading))
-        }
+      val saved = showSaved.value
+      if (saved && savedPosts.value.isEmpty()) {
+        EmptyList(saved)
+      } else if (!saved && posts.value.isEmpty()) {
+        EmptyList(saved)
       } else {
-        LazyColumnForIndexed(
-          items = state.value,
-          modifier = Modifier.padding(horizontal = 8.dp)
-        ) { index, item ->
-          if (lastIndex == index) {
-            viewModel.getMorePosts()
-          }
-          LobstersItem(
-            item,
-            linkOpenAction = { post -> urlLauncher.launch(post.url.ifEmpty { post.commentsUrl }) },
-            commentOpenAction = { post -> urlLauncher.launch(post.commentsUrl) },
-          )
-        }
-      }
-    },
-    floatingActionButton = {
-      FloatingActionButton(onClick = { viewModel.refreshPosts() }) {
-        IconResource(resourceId = R.drawable.ic_refresh_24px)
+        LobsterList(
+          showSaved.value,
+          savedPosts.value,
+          posts.value,
+          lastIndex,
+          viewModel,
+          urlLauncher
+        )
       }
     },
+    floatingActionButton = { LobstersFAB(showSaved.value, viewModel) },
   )
 }
+
+@Composable
+private fun LobstersFAB(
+  showSaved: Boolean,
+  viewModel: LobstersViewModel
+) {
+  if (!showSaved) {
+    FloatingActionButton(
+      onClick = { viewModel.refreshPosts() },
+      modifier = Modifier
+    ) {
+      IconResource(resourceId = R.drawable.ic_refresh_24px)
+    }
+  }
+}
+
+@Composable
+private fun LobsterList(
+  showSaved: Boolean,
+  savedPosts: List<LobstersPost>,
+  hottestPosts: List<LobstersPost>,
+  lastIndex: Int,
+  viewModel: LobstersViewModel,
+  urlLauncher: UrlLauncher
+) {
+  val hottestPostsListState = rememberLazyListState()
+  val savedPostsListState = rememberLazyListState()
+
+  LazyColumnForIndexed(
+    items = if (showSaved) savedPosts else hottestPosts,
+    state = if (showSaved) savedPostsListState else hottestPostsListState,
+    modifier = Modifier.padding(horizontal = 8.dp)
+  ) { index, item ->
+    if (lastIndex == index && !showSaved) {
+      viewModel.getMorePosts()
+    }
+    LobstersItem(
+      item,
+      linkOpenAction = { post -> urlLauncher.launch(post.url.ifEmpty { post.commentsUrl }) },
+      commentOpenAction = { post -> urlLauncher.launch(post.commentsUrl) },
+      saveAction = { post ->
+        if (showSaved) {
+          viewModel.removeSavedPost(post)
+        } else {
+          viewModel.savePost(post)
+        }
+      },
+    )
+  }
+}
+
+@Composable
+private fun EmptyList(showSaved: Boolean) {
+  Column(
+    modifier = Modifier.fillMaxSize(),
+    verticalArrangement = Arrangement.Center,
+    horizontalAlignment = Alignment.CenterHorizontally,
+  ) {
+    if (showSaved) {
+      IconResource(
+        R.drawable.ic_favorite_border_24px,
+        tint = savedTitleColor,
+        modifier = Modifier.padding(16.dp)
+      )
+      Text(stringResource(R.string.no_saved_posts))
+    } else {
+      IconResource(R.drawable.ic_sync_problem_24px, modifier = Modifier.padding(16.dp))
+      Text(stringResource(R.string.loading))
+    }
+  }
+}
+
+@Composable
+private fun LobstersTopAppBar(showSaved: Boolean, toggleAction: () -> Unit) {
+  TopAppBar {
+    Box(modifier = Modifier.fillMaxWidth()) {
+      Text(
+        text = if (showSaved) "Saved" else "Home",
+        modifier = Modifier.padding(16.dp).align(Alignment.CenterStart),
+        style = MaterialTheme.typography.h6,
+      )
+      IconToggleButton(
+        checked = showSaved,
+        onCheckedChange = { toggleAction.invoke() },
+        modifier = Modifier.padding(8.dp).align(Alignment.CenterEnd),
+      ) {
+        IconResource(
+          resourceId = if (showSaved) R.drawable.ic_favorite_24px else R.drawable.ic_favorite_border_24px,
+          tint = savedTitleColor,
+        )
+      }
+    }
+  }
+}

app/src/main/java/dev/msfjarvis/lobsters/compose/utils/DeferredIcon.kt

@@ -16,8 +16,8 @@
 package dev.msfjarvis.lobsters.compose.utils
 
 import androidx.annotation.DrawableRes
-import androidx.compose.foundation.Icon
 import androidx.compose.foundation.AmbientContentColor
+import androidx.compose.foundation.Icon
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color

app/src/main/java/dev/msfjarvis/lobsters/data/LobstersViewModel.kt

@@ -20,14 +20,16 @@ class LobstersViewModel @ViewModelInject constructor(
 ) : ViewModel() {
   private var apiPage = 1
   private val _posts = MutableStateFlow<List<LobstersPost>>(emptyList())
-  private val dao = database.postsDao()
+  private val _savedPosts = MutableStateFlow<List<LobstersPost>>(emptyList())
+  private val postsDao = database.postsDao()
+  private val savedPostsDao = database.savedPostsDao()
   private val coroutineExceptionHandler = CoroutineExceptionHandler { _, throwable ->
     when (throwable) {
       // Swallow known network errors that can be recovered from.
       is UnknownHostException, is SocketTimeoutException -> {
         if (_posts.value.isEmpty()) {
           viewModelScope.launch {
-            dao.loadPosts().collectLatest { _posts.value = it }
+            postsDao.loadPosts().collectLatest { _posts.value = it }
           }
         }
       }
@@ -35,9 +37,17 @@ class LobstersViewModel @ViewModelInject constructor(
     }
   }
   val posts: StateFlow<List<LobstersPost>> get() = _posts
+  val savedPosts: StateFlow<List<LobstersPost>> get() = _savedPosts
 
   init {
     getMorePostsInternal(true)
+    getSavedPosts()
+  }
+
+  private fun getSavedPosts() {
+    viewModelScope.launch {
+      savedPostsDao.loadPosts().collectLatest { _savedPosts.value = it }
+    }
   }
 
   fun getMorePosts() {
@@ -52,14 +62,36 @@ class LobstersViewModel @ViewModelInject constructor(
   private fun getMorePostsInternal(firstLoad: Boolean) {
     viewModelScope.launch(coroutineExceptionHandler) {
       val newPosts = lobstersApi.getHottestPosts(apiPage)
+        .transformLikedFlag()
+        .toList()
       if (firstLoad) {
         _posts.value = newPosts
-        dao.deleteAllPosts()
+        postsDao.deleteAllPosts()
       } else {
         _posts.value += newPosts
       }
       apiPage += 1
-      dao.insertPosts(*_posts.value.toTypedArray())
+      postsDao.insertPosts(*_posts.value.toTypedArray())
     }
   }
+
+  fun savePost(post: LobstersPost) {
+    viewModelScope.launch {
+      savedPostsDao.insertPosts(post)
+      getSavedPosts()
+      _posts.value = _posts.value.transformLikedFlag().toList()
+    }
+  }
+
+  fun removeSavedPost(post: LobstersPost) {
+    viewModelScope.launch {
+      savedPostsDao.deletePostById(post.shortId)
+      getSavedPosts()
+      _posts.value = _posts.value.transformLikedFlag().toList()
+    }
+  }
+
+  private suspend fun List<LobstersPost>.transformLikedFlag() = map {
+    it.apply { isLiked = savedPostsDao.isLiked(shortId) }
+  }
 }

app/src/main/java/dev/msfjarvis/lobsters/di/ApiModule.kt

@@ -11,6 +11,7 @@ import dev.msfjarvis.lobsters.api.LobstersApi
 @Module
 object ApiModule {
   const val LOBSTERS_URL = "https://lobste.rs"
+
   @Provides
   fun provideLobstersApi(): LobstersApi {
     return ApiClient.getClient(LOBSTERS_URL)

app/src/main/java/dev/msfjarvis/lobsters/ui/LobstersItem.kt

@@ -13,6 +13,8 @@ import androidx.compose.foundation.lazy.LazyColumnFor
 import androidx.compose.foundation.lazy.LazyItemScope
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -31,18 +33,27 @@ fun LazyItemScope.LobstersItem(
   modifier: Modifier = Modifier,
   linkOpenAction: (LobstersPost) -> Unit,
   commentOpenAction: (LobstersPost) -> Unit,
+  saveAction: (LobstersPost) -> Unit,
 ) {
+  val liked = remember { mutableStateOf(false) }
+  val titleColor = if (post.isLiked || liked.value) savedTitleColor else titleColor
+
   Column(
     modifier = modifier
       .fillParentMaxWidth()
       .clickable(
         onClick = { linkOpenAction.invoke(post) },
-        onLongClick = { commentOpenAction.invoke(post) }
+        onLongClick = { commentOpenAction.invoke(post) },
+        onDoubleClick = {
+          post.isLiked = true
+          liked.value = true
+          saveAction.invoke(post)
+        },
       ),
   ) {
     Text(
       text = post.title,
-      color = Color(0xFF7395D9),
+      color = titleColor,
       fontWeight = FontWeight.Bold,
       modifier = Modifier.padding(top = 4.dp)
     )
@@ -106,11 +117,15 @@ fun PreviewLobstersItem() {
       null,
       null,
     ),
-    listOf("openbsd")
+    listOf("openbsd"),
   )
   LobstersTheme {
     LazyColumnFor(items = listOf(post)) { item ->
-      LobstersItem(post = item, linkOpenAction = {}, commentOpenAction = {})
+      LobstersItem(
+        post = item,
+        linkOpenAction = {},
+        commentOpenAction = {},
+        saveAction = {})
     }
   }
 }

app/src/main/java/dev/msfjarvis/lobsters/ui/Theme.kt

@@ -5,6 +5,9 @@ import androidx.compose.material.darkColors
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.Color
 
+val titleColor = Color(0xFF7395D9)
+val savedTitleColor = Color(0xFFD97373)
+
 val darkColors = darkColors(
   primary = Color.White,
   secondary = Color(0xFF6C0000),

app/src/main/res/drawable/ic_favorite_24px.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M12,21.35l-1.45,-1.32C5.4,15.36 2,12.28 2,8.5 2,5.42 4.42,3 7.5,3c1.74,0 3.41,0.81 4.5,2.09C13.09,3.81 14.76,3 16.5,3 19.58,3 22,5.42 22,8.5c0,3.78 -3.4,6.86 -8.55,11.54L12,21.35z"/>
+</vector>

app/src/main/res/drawable/ic_favorite_border_24px.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M16.5,3c-1.74,0 -3.41,0.81 -4.5,2.09C10.91,3.81 9.24,3 7.5,3 4.42,3 2,5.42 2,8.5c0,3.78 3.4,6.86 8.55,11.54L12,21.35l1.45,-1.32C18.6,15.36 22,12.28 22,8.5 22,5.42 19.58,3 16.5,3zM12.1,18.55l-0.1,0.1 -0.1,-0.1C7.14,14.24 4,11.39 4,8.5 4,6.5 5.5,5 7.5,5c1.54,0 3.04,0.99 3.57,2.36h1.87C13.46,5.99 14.96,5 16.5,5c2,0 3.5,1.5 3.5,3.5 0,2.89 -3.14,5.74 -7.9,10.05z"/>
+</vector>

app/src/main/res/values/strings.xml

@@ -1,4 +1,5 @@
 <resources>
     <string name="app_name">lobste.rs</string>
     <string name="loading">Loading posts…</string>
+    <string name="no_saved_posts">You don\'t have any saved posts</string>
 </resources>

data/src/main/java/dev/msfjarvis/lobsters/data/model/SavedLobstersEntity.kt

@@ -0,0 +1,14 @@
+package dev.msfjarvis.lobsters.data.model
+
+import androidx.room.Embedded
+import androidx.room.Entity
+import dev.msfjarvis.lobsters.model.LobstersPost
+
+@Entity(
+  tableName = "lobsters_saved_posts",
+  primaryKeys = ["shortId"],
+)
+data class SavedLobstersEntity(
+  @Embedded
+  val post: LobstersPost
+)

data/src/main/java/dev/msfjarvis/lobsters/data/source/PostsDao.kt

@@ -6,6 +6,7 @@ import androidx.room.Insert
 import androidx.room.OnConflictStrategy
 import androidx.room.Query
 import androidx.room.Transaction
+import androidx.room.Update
 import dev.msfjarvis.lobsters.data.model.LobstersEntity
 import dev.msfjarvis.lobsters.model.LobstersPost
 import kotlinx.coroutines.flow.Flow
@@ -15,6 +16,15 @@ abstract class PostsDao {
   @Query("SELECT * FROM lobsters_posts")
   abstract fun loadPosts(): Flow<List<LobstersPost>>
 
+  @Update
+  suspend fun updatePost(vararg posts: LobstersPost) {
+    updatePosts(posts.map { LobstersEntity(it) })
+  }
+
+  @Update(onConflict = OnConflictStrategy.IGNORE)
+  protected abstract suspend fun updatePosts(posts: List<LobstersEntity>)
+
+
   @Transaction
   open suspend fun insertPosts(vararg posts: LobstersPost) {
     insertPosts(posts.map { LobstersEntity(it) })

data/src/main/java/dev/msfjarvis/lobsters/data/source/PostsDatabase.kt

@@ -4,12 +4,14 @@ import androidx.room.Database
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
 import dev.msfjarvis.lobsters.data.model.LobstersEntity
+import dev.msfjarvis.lobsters.data.model.SavedLobstersEntity
 
 @Database(
   entities = [
     LobstersEntity::class,
+    SavedLobstersEntity::class
   ],
-  version = 1,
+  version = 2,
   exportSchema = false,
 )
 @TypeConverters(
@@ -17,4 +19,5 @@ import dev.msfjarvis.lobsters.data.model.LobstersEntity
 )
 abstract class PostsDatabase : RoomDatabase() {
   abstract fun postsDao(): PostsDao
+  abstract fun savedPostsDao(): SavedPostsDao
 }

data/src/main/java/dev/msfjarvis/lobsters/data/source/SavedPostsDao.kt

@@ -0,0 +1,42 @@
+package dev.msfjarvis.lobsters.data.source
+
+import androidx.room.Dao
+import androidx.room.Delete
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Transaction
+import dev.msfjarvis.lobsters.data.model.SavedLobstersEntity
+import dev.msfjarvis.lobsters.model.LobstersPost
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+abstract class SavedPostsDao {
+  @Query("SELECT * FROM lobsters_saved_posts")
+  abstract fun loadPosts(): Flow<List<LobstersPost>>
+
+  @Transaction
+  open suspend fun insertPosts(vararg posts: LobstersPost) {
+    insertPosts(posts.map { SavedLobstersEntity(it) })
+  }
+
+  @Insert(onConflict = OnConflictStrategy.IGNORE)
+  protected abstract suspend fun insertPosts(posts: List<SavedLobstersEntity>)
+
+  @Transaction
+  open suspend fun deletePosts(vararg posts: LobstersPost) {
+    deletePosts(posts.map { SavedLobstersEntity(it) })
+  }
+
+  @Delete
+  protected abstract suspend fun deletePosts(posts: List<SavedLobstersEntity>)
+
+  @Query("DELETE FROM lobsters_saved_posts")
+  abstract suspend fun deleteAllPosts()
+
+  @Query("DELETE FROM lobsters_saved_posts WHERE shortId LIKE :shortId")
+  abstract suspend fun deletePostById(shortId: String)
+
+  @Query("SELECT EXISTS(SELECT 1 FROM lobsters_saved_posts WHERE shortId LIKE :shortId)")
+  abstract suspend fun isLiked(shortId: String): Boolean
+}

lobsters-api/src/test/java/dev/msfjarvis/lobsters/api/TestUtils.kt

@@ -3,7 +3,7 @@ package dev.msfjarvis.lobsters.api
 import java.io.File
 
 object TestUtils {
-  fun getJson(path : String) : String {
+  fun getJson(path: String): String {
     // Load the JSON response
     val uri = javaClass.classLoader.getResource(path)
     val file = File(uri.path)

model/src/main/java/dev/msfjarvis/lobsters/model/LobstersPost.kt

@@ -22,5 +22,6 @@ class LobstersPost(
   val commentsUrl: String,
   @Json(name = "submitter_user")
   val submitterUser: Submitter,
-  val tags: List<String>
+  val tags: List<String>,
+  var isLiked: Boolean = false,
 )