[SPIKE][Experiment] Articles by Categories

app/src/main/java/org/wikipedia/dataclient/Service.kt

@@ -172,6 +172,9 @@ interface Service {
     @GET(MW_API_PREFIX + "action=query&prop=info&generator=categories&inprop=varianttitles|displaytitle&gclshow=!hidden&gcllimit=500")
     suspend fun getCategories(@Query("titles") titles: String): MwQueryResponse
 
+    @GET(MW_API_PREFIX + "action=query&prop=categories&clshow=!hidden&cllimit=100")
+    suspend fun getCategoriesProps(@Query("titles") titles: String): MwQueryResponse
+
     @GET(MW_API_PREFIX + "action=query&prop=description|pageimages|info&pilicense=any&generator=categorymembers&inprop=varianttitles|displaytitle&gcmprop=ids|title")
     suspend fun getCategoryMembers(
         @Query("gcmtitle") title: String,

app/src/main/java/org/wikipedia/dataclient/mwapi/MwQueryPage.kt

@@ -24,6 +24,7 @@ class MwQueryPage {
     @SerialName("pageid") val pageId = 0
     @SerialName("pageprops") val pageProps: PageProps? = null
     @SerialName("entityterms") val entityTerms: EntityTerms? = null
+    @SerialName("categories") val categoriesProps: List<Category>? = null
 
     val ns = 0
     val coordinates: List<Coordinates>? = null
@@ -147,4 +148,10 @@ class MwQueryPage {
         val label: List<String> = emptyList()
         val description: List<String> = emptyList()
     }
+
+    @Serializable
+    class Category {
+        val ns = 0
+        val title: String = ""
+    }
 }

app/src/main/java/org/wikipedia/history/HistoryFragment.kt

@@ -9,11 +9,13 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.LinearLayout
+import android.widget.ScrollView
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
 import androidx.core.view.isVisible
+import androidx.core.view.setPadding
 import androidx.core.view.updateLayoutParams
 import androidx.core.view.updateMarginsRelative
 import androidx.fragment.app.Fragment
@@ -38,6 +40,7 @@ import org.wikipedia.util.DimenUtil
 import org.wikipedia.util.FeedbackUtil
 import org.wikipedia.util.Resource
 import org.wikipedia.util.ResourceUtil
+import org.wikipedia.util.StringUtil
 import org.wikipedia.util.log.L
 import org.wikipedia.views.DefaultViewHolder
 import org.wikipedia.views.PageItemView
@@ -91,7 +94,6 @@ class HistoryFragment : Fragment(), BackPressedHandler {
             }
         }
     }
-
     private fun setUpScrollListener() {
         binding.historyList.addOnScrollListener(object : RecyclerView.OnScrollListener() {
             override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
@@ -260,6 +262,7 @@ class HistoryFragment : Fragment(), BackPressedHandler {
         init {
             val searchCardView = itemView.findViewById<WikiCardView>(R.id.search_card)
             val voiceSearchButton = itemView.findViewById<View>(R.id.voice_search_button)
+            val categoriesDialogButton = itemView.findViewById<ImageView>(R.id.categories_dialog)
             historyFilterButton = itemView.findViewById(R.id.history_filter)
             clearHistoryButton = itemView.findViewById(R.id.history_delete)
             searchCardView.setOnClickListener { (requireParentFragment() as MainFragment).openSearchActivity(Constants.InvokeSource.NAV_MENU, null, it) }
@@ -282,6 +285,34 @@ class HistoryFragment : Fragment(), BackPressedHandler {
                     deleteSelectedPages()
                 }
             }
+            categoriesDialogButton.setOnClickListener {
+                val groupData = viewModel.groupedTitles
+
+                var htmlContent = ""
+                groupData.forEach {
+                    htmlContent += "${it.first} <b> (${it.second})</b> <br>"
+                }
+
+                val textView = TextView(requireContext()).apply {
+                    text = StringUtil.fromHtml(htmlContent)
+                    textSize = 14f
+                }
+
+                val scrollView = ScrollView(requireContext()).apply {
+                    layoutParams = ViewGroup.LayoutParams(
+                        ViewGroup.LayoutParams.MATCH_PARENT,
+                        ViewGroup.LayoutParams.WRAP_CONTENT
+                    )
+                    setPadding(DimenUtil.roundedDpToPx(12f))
+                    addView(textView)
+                }
+
+                MaterialAlertDialogBuilder(requireContext())
+                    .setTitle(R.string.action_item_categories)
+                    .setView(scrollView)
+                    .setPositiveButton(android.R.string.ok, null)
+                    .show()
+            }
             FeedbackUtil.setButtonTooltip(historyFilterButton, clearHistoryButton)
             adjustSearchCardView(searchCardView)
         }

app/src/main/java/org/wikipedia/history/HistoryViewModel.kt

@@ -6,12 +6,18 @@ import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import org.wikipedia.WikipediaApp
 import org.wikipedia.database.AppDatabase
+import org.wikipedia.dataclient.ServiceFactory
+import org.wikipedia.dataclient.mwapi.MwQueryPage.Category
 import org.wikipedia.util.Resource
 import org.wikipedia.util.SingleLiveData
+import org.wikipedia.util.StringUtil
 
 class HistoryViewModel : ViewModel() {
 
@@ -33,6 +39,7 @@ class HistoryViewModel : ViewModel() {
 
     val historyItems = MutableLiveData(Resource<List<Any>>())
     val deleteHistoryItemsAction = SingleLiveData<Resource<Boolean>>()
+    var groupedTitles = emptyList<Pair<String, Int>>()
 
     init {
         reloadHistoryItems()
@@ -47,6 +54,26 @@ class HistoryViewModel : ViewModel() {
     private suspend fun loadHistoryItems() {
         withContext(Dispatchers.IO) {
             val items = AppDatabase.instance.historyEntryWithImageDao().filterHistoryItems(searchQuery.orEmpty())
+            val historyEntryItems = items.filterIsInstance<HistoryEntry>()
+
+            val categories = mutableListOf<Category>()
+            val deferredCategories = historyEntryItems.map { item ->
+                async {
+                    try {
+                        val response = ServiceFactory.get(WikipediaApp.instance.wikiSite).getCategoriesProps(item.apiTitle)
+                        response.query?.firstPage()?.categoriesProps ?: emptyList()
+                    } catch (e: Exception) {
+                        // Handle exceptions appropriately, e.g., log, return emptyList, etc.
+                        println("Error fetching categories for ${item.apiTitle}: ${e.message}")
+                        emptyList() // or throw e; depending on your error handling.
+                    }
+                }
+            }
+
+            deferredCategories.awaitAll().forEach { categories.addAll(it) }
+
+            // Grouping the titles by setting in a Pair<> with its name and count
+            groupedTitles = categories.groupBy { it.title }.map { Pair(StringUtil.removeNamespace(it.key), it.value.size) }.sortedByDescending { it.second }
             historyItems.postValue(Resource.Success(items))
         }
     }

app/src/main/res/layout/view_history_header_with_search.xml

@@ -35,6 +35,18 @@
             android:textSize="24sp"
             android:textStyle="bold" />
 
+        <ImageView
+            android:id="@+id/categories_dialog"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:clickable="true"
+            android:contentDescription="@string/action_item_categories"
+            android:focusable="true"
+            android:background="?attr/actionBarItemBackground"
+            android:scaleType="centerInside"
+            app:srcCompat="@drawable/ic_category_black_24dp"
+            app:tint="?attr/progressive_color" />
+
         <ImageView
             android:id="@+id/history_filter"
             android:layout_width="48dp"