[Tags IA] Fetch posts for multiple tags

WordPress/src/main/java/org/wordpress/android/datasets/wrappers/ReaderPostTableWrapper.kt

@@ -5,6 +5,8 @@ import org.wordpress.android.datasets.ReaderPostTable
 import org.wordpress.android.models.ReaderPost
 import org.wordpress.android.models.ReaderPostList
 import org.wordpress.android.models.ReaderTag
+import org.wordpress.android.ui.reader.actions.ReaderActions.UpdateResult
+import org.wordpress.android.ui.reader.models.ReaderBlogIdPostId
 import javax.inject.Inject
 
 @Reusable
@@ -30,6 +32,23 @@ class ReaderPostTableWrapper @Inject constructor() {
 
     fun getNumPostsWithTag(readerTag: ReaderTag): Int = ReaderPostTable.getNumPostsWithTag(readerTag)
 
-    fun addOrUpdatePosts(readerTag: ReaderTag, posts: ReaderPostList) =
+    fun addOrUpdatePosts(readerTag: ReaderTag?, posts: ReaderPostList) =
         ReaderPostTable.addOrUpdatePosts(readerTag, posts)
+
+    fun deletePostsWithTag(tag: ReaderTag) = ReaderPostTable.deletePostsWithTag(tag)
+
+    fun comparePosts(posts: ReaderPostList): UpdateResult = ReaderPostTable.comparePosts(posts)
+
+    fun updateBookmarkedPostPseudoId(posts: ReaderPostList) = ReaderPostTable.updateBookmarkedPostPseudoId(posts)
+
+    fun setGapMarkerForTag(blogId: Long, postId: Long, tag: ReaderTag) =
+        ReaderPostTable.setGapMarkerForTag(blogId, postId, tag)
+
+    fun removeGapMarkerForTag(tag: ReaderTag) = ReaderPostTable.removeGapMarkerForTag(tag)
+
+    fun deletePostsBeforeGapMarkerForTag(tag: ReaderTag) = ReaderPostTable.deletePostsBeforeGapMarkerForTag(tag)
+
+    fun hasOverlap(posts: ReaderPostList?, tag: ReaderTag): Boolean = ReaderPostTable.hasOverlap(posts, tag)
+
+    fun getGapMarkerIdsForTag(tag: ReaderTag): ReaderBlogIdPostId? = ReaderPostTable.getGapMarkerIdsForTag(tag)
 }

WordPress/src/main/java/org/wordpress/android/ui/bloggingprompts/BloggingPromptsPostTagProvider.kt

@@ -2,7 +2,7 @@ package org.wordpress.android.ui.bloggingprompts
 
 import org.wordpress.android.models.ReaderTag
 import org.wordpress.android.models.ReaderTagType
-import org.wordpress.android.ui.reader.services.post.ReaderPostLogic
+import org.wordpress.android.ui.reader.repository.ReaderPostRepository
 import org.wordpress.android.ui.reader.utils.ReaderUtilsWrapper
 import javax.inject.Inject
 
@@ -23,7 +23,7 @@ class BloggingPromptsPostTagProvider @Inject constructor(
             promptIdTag,
             promptIdTag,
             promptIdTag,
-            ReaderPostLogic.formatFullEndpointForTag(promptIdTag),
+            ReaderPostRepository.formatFullEndpointForTag(promptIdTag),
             ReaderTagType.FOLLOWED,
         )
     }

WordPress/src/main/java/org/wordpress/android/ui/prefs/AppPrefsWrapper.kt

@@ -448,6 +448,10 @@ class AppPrefsWrapper @Inject constructor() {
     fun getShouldHideDynamicCard(id: String, ): Boolean =
         AppPrefs.getShouldHideDynamicCard(id)
 
+    fun shouldUpdateBookmarkPostsPseudoIds(tag: ReaderTag?): Boolean = AppPrefs.shouldUpdateBookmarkPostsPseudoIds(tag)
+
+    fun setBookmarkPostsPseudoIdsUpdated() = AppPrefs.setBookmarkPostsPseudoIdsUpdated()
+
     fun getAllPrefs(): Map<String, Any?> = AppPrefs.getAllPrefs()
 
     fun setString(prefKey: PrefKey, value: String) {

WordPress/src/main/java/org/wordpress/android/ui/reader/ReaderFragment.kt

@@ -226,14 +226,15 @@ class ReaderFragment : Fragment(R.layout.reader_fragment_layout), ScrollableView
         }
 
         childFragmentManager.beginTransaction().apply {
-            val fragment = if (uiState.selectedReaderTag.isDiscover) {
-                ReaderDiscoverFragment()
-            } else {
-                ReaderPostListFragment.newInstanceForTag(
-                    uiState.selectedReaderTag,
+            val selectedTag = uiState.selectedReaderTag
+            val fragment = when {
+                selectedTag.isDiscover -> ReaderDiscoverFragment()
+                selectedTag.isTags -> ReaderTagsFeedFragment.newInstance(selectedTag)
+                else -> ReaderPostListFragment.newInstanceForTag(
+                    selectedTag,
                     ReaderTypes.ReaderPostListType.TAG_FOLLOWED,
                     true,
-                    uiState.selectedReaderTag.isFilterable
+                    selectedTag.isFilterable
                 )
             }
             replace(R.id.container, fragment, uiState.selectedReaderTag.tagSlug)

WordPress/src/main/java/org/wordpress/android/ui/reader/ReaderTagsFeedFragment.kt

@@ -0,0 +1,232 @@
+package org.wordpress.android.ui.reader
+
+import android.os.Bundle
+import android.view.View
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.fragment.app.viewModels
+import androidx.lifecycle.ViewModelProvider
+import dagger.hilt.android.AndroidEntryPoint
+import org.wordpress.android.R
+import org.wordpress.android.databinding.ReaderTagFeedFragmentLayoutBinding
+import org.wordpress.android.models.ReaderTag
+import org.wordpress.android.ui.ViewPagerFragment
+import org.wordpress.android.ui.compose.theme.AppThemeWithoutBackground
+import org.wordpress.android.ui.main.WPMainActivity
+import org.wordpress.android.ui.reader.services.update.ReaderUpdateServiceStarter
+import org.wordpress.android.ui.reader.subfilter.SubFilterViewModel
+import org.wordpress.android.ui.reader.subfilter.SubFilterViewModel.Companion.getViewModelKeyForTag
+import org.wordpress.android.ui.reader.subfilter.SubfilterListItem
+import org.wordpress.android.ui.reader.viewmodels.ReaderTagsFeedViewModel
+import org.wordpress.android.ui.reader.viewmodels.ReaderViewModel
+import org.wordpress.android.util.NetworkUtils
+import org.wordpress.android.util.extensions.getSerializableCompat
+import javax.inject.Inject
+
+/**
+ * Initial implementation of ReaderTagsFeedFragment with the idea of it containing both a ComposeView, which will host
+ * all Compose content related to the new Tags Feed as well as an internal ReaderPostListFragment, which will be used
+ * to display "filtered" content based on the currently selected tag on the top app bar filter.
+ *
+ * It might be tricky to get this working properly since a lot of places expect the ReaderPostListFragment to be the
+ * main content of the ReaderFragment (e.g.: initializing the SubFilterViewModel), so a few changes might be needed.
+ */
+@AndroidEntryPoint
+class ReaderTagsFeedFragment : ViewPagerFragment(R.layout.reader_tag_feed_fragment_layout),
+    WPMainActivity.OnScrollToTopListener {
+    private val tagsFeedTag by lazy {
+        // TODO maybe we can just create a static function somewhere that returns the Tags Feed ReaderTag, since it's
+        //  used in multiple places, client-side only, and always the same.
+        requireArguments().getSerializableCompat<ReaderTag>(ARG_TAGS_FEED_TAG)!!
+    }
+
+    @Inject
+    lateinit var viewModelFactory: ViewModelProvider.Factory
+    private lateinit var subFilterViewModel: SubFilterViewModel
+
+    private val viewModel: ReaderTagsFeedViewModel by viewModels()
+    private val readerViewModel: ReaderViewModel by viewModels(
+        ownerProducer = { requireParentFragment() }
+    )
+
+    // binding
+    private lateinit var binding: ReaderTagFeedFragmentLayoutBinding
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        binding = ReaderTagFeedFragmentLayoutBinding.bind(view)
+
+        binding.composeView.setContent {
+            AppThemeWithoutBackground {
+                val uiState by viewModel.uiStateFlow.collectAsState()
+                ReaderTagsFeedScreen(
+                    uiState = uiState,
+                    onRetryClicked = viewModel::fetchTag,
+                )
+            }
+        }
+
+        initViewModels(savedInstanceState)
+    }
+
+    private fun initViewModels(savedInstanceState: Bundle?) {
+        subFilterViewModel = ViewModelProvider(this, viewModelFactory).get(
+            getViewModelKeyForTag(tagsFeedTag),
+            SubFilterViewModel::class.java
+        )
+        subFilterViewModel.start(tagsFeedTag, tagsFeedTag, savedInstanceState)
+
+        subFilterViewModel.updateTagsAndSites.observe(viewLifecycleOwner) { event ->
+            event.applyIfNotHandled {
+                if (NetworkUtils.isNetworkAvailable(activity)) {
+                    ReaderUpdateServiceStarter.startService(activity, this)
+                }
+            }
+        }
+
+        subFilterViewModel.subFilters.observe(viewLifecycleOwner) { subFilters ->
+            readerViewModel.showTopBarFilterGroup(
+                tagsFeedTag,
+                subFilters
+            )
+
+            val tags = subFilters.filterIsInstance<SubfilterListItem.Tag>().map { it.tag }
+            viewModel.fetchAll(tags)
+        }
+        subFilterViewModel.updateTagsAndSites()
+    }
+
+    override fun getScrollableViewForUniqueIdProvision(): View {
+        return binding.composeView
+    }
+
+    override fun onScrollToTop() {
+        // TODO scroll current content to top
+    }
+
+    companion object {
+        private const val ARG_TAGS_FEED_TAG = "tags_feed_tag"
+
+        fun newInstance(
+            feedTag: ReaderTag
+        ): ReaderTagsFeedFragment = ReaderTagsFeedFragment().apply {
+            arguments = Bundle().apply {
+                putSerializable(ARG_TAGS_FEED_TAG, feedTag)
+            }
+        }
+    }
+}
+
+/**
+ * Throwaway UI code just for testing the initial Tags Feed fetching code.
+ * TODO remove this and replace with the final Compose content.
+ */
+@Composable
+private fun ReaderTagsFeedScreen(
+    uiState: ReaderTagsFeedViewModel.UiState,
+    onRetryClicked: (ReaderTag) -> Unit,
+) {
+    Column(
+        modifier = Modifier
+            .fillMaxHeight()
+            .verticalScroll(rememberScrollState())
+            .padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        uiState.tagStates.forEach { (tag, fetchState) ->
+            Column(
+                verticalArrangement = Arrangement.spacedBy(4.dp),
+            ) {
+                Text(
+                    text = tag.tagTitle,
+                    style = MaterialTheme.typography.h4,
+                )
+
+                when (fetchState) {
+                    is ReaderTagsFeedViewModel.FetchState.Loading -> {
+                        Text(
+                            text = "Loading...",
+                            style = MaterialTheme.typography.body1,
+                        )
+                    }
+
+                    is ReaderTagsFeedViewModel.FetchState.Error -> {
+                        Row(
+                            horizontalArrangement = Arrangement.spacedBy(2.dp),
+                        ) {
+                            Text(
+                                text = "Error loading posts.",
+                                style = MaterialTheme.typography.body1,
+                            )
+
+                            Text(
+                                text = "Retry",
+                                style = MaterialTheme.typography.body1,
+                                textDecoration = TextDecoration.Underline,
+                                color = MaterialTheme.colors.primary,
+                                modifier = Modifier
+                                    .padding(start = 8.dp)
+                                    .clickable { onRetryClicked(tag) },
+                            )
+                        }
+                    }
+
+                    is ReaderTagsFeedViewModel.FetchState.Success -> {
+                        Row(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .horizontalScroll(rememberScrollState()),
+                        ) {
+                            fetchState.posts.forEach { post ->
+                                Column(
+                                    modifier = Modifier
+                                        .width(300.dp)
+                                        .background(
+                                            MaterialTheme.colors.surface,
+                                            RoundedCornerShape(4.dp)
+                                        )
+                                        .padding(4.dp),
+                                    verticalArrangement = Arrangement.spacedBy(4.dp),
+                                ) {
+                                    Text(
+                                        text = post.title,
+                                        style = MaterialTheme.typography.h5,
+                                        maxLines = 2,
+                                        overflow = TextOverflow.Ellipsis,
+                                    )
+
+                                    Text(
+                                        text = post.excerpt,
+                                        style = MaterialTheme.typography.body1,
+                                        maxLines = 4,
+                                        overflow = TextOverflow.Ellipsis,
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

WordPress/src/main/java/org/wordpress/android/ui/reader/exceptions/ReaderPostFetchException.kt

@@ -0,0 +1,5 @@
+package org.wordpress.android.ui.reader.exceptions
+
+class ReaderPostFetchException(
+    message: String = "Failed to fetch post(s).",
+) : RuntimeException(message)