add progress and error messages if comments disabled or empty

app/src/main/java/com/github/libretube/ui/sheets/CommentsSheet.kt

@@ -7,11 +7,14 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
+import com.github.libretube.R
 import com.github.libretube.api.RetrofitInstance
 import com.github.libretube.api.obj.Comment
-import com.github.libretube.databinding.BottomSheetBinding
+import com.github.libretube.databinding.CommentsSheetBinding
 import com.github.libretube.extensions.TAG
 import com.github.libretube.ui.adapters.CommentsAdapter
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 
 class CommentsSheet(
     private val videoId: String,
@@ -19,25 +22,25 @@ class CommentsSheet(
     private var nextPage: String?,
     private val onMoreComments: (comments: List<Comment>, nextPage: String?) -> Unit
 ) : ExpandedBottomSheet() {
-    private lateinit var binding: BottomSheetBinding
+    private lateinit var binding: CommentsSheetBinding
 
     private lateinit var commentsAdapter: CommentsAdapter
     private var isLoading = false
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
-        binding = BottomSheetBinding.inflate(layoutInflater)
+        binding = CommentsSheetBinding.inflate(layoutInflater)
         return binding.root
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        binding.optionsRecycler.layoutManager = LinearLayoutManager(requireContext())
+        binding.commentsRV.layoutManager = LinearLayoutManager(requireContext())
-        binding.optionsRecycler.setItemViewCacheSize(20)
+        binding.commentsRV.setItemViewCacheSize(20)
 
-        binding.optionsRecycler.viewTreeObserver
+        binding.commentsRV.viewTreeObserver
             .addOnScrollChangedListener {
-                if (!binding.optionsRecycler.canScrollVertically(1)) {
+                if (!binding.commentsRV.canScrollVertically(1)) {
                     fetchNextComments()
                 }
             }
@@ -45,12 +48,13 @@ class CommentsSheet(
         commentsAdapter = CommentsAdapter(videoId, comments) {
             dialog?.dismiss()
         }
-        binding.optionsRecycler.adapter = commentsAdapter
+        binding.commentsRV.adapter = commentsAdapter
 
         if (comments.isEmpty()) fetchComments()
     }
 
     private fun fetchComments() {
+        binding.progress.visibility = View.VISIBLE
         lifecycleScope.launchWhenCreated {
             isLoading = true
             val response = try {
@@ -59,6 +63,20 @@ class CommentsSheet(
                 Log.e(TAG(), e.toString())
                 return@launchWhenCreated
             }
+            if (response.disabled == true) {
+                withContext(Dispatchers.Main) {
+                    binding.errorTV.visibility = View.VISIBLE
+                }
+                return@launchWhenCreated
+            }
+            if (response.comments.isEmpty()) {
+                withContext(Dispatchers.Main) {
+                    binding.errorTV.text = getString(R.string.no_comments_available)
+                    binding.errorTV.visibility = View.VISIBLE
+                }
+                return@launchWhenCreated
+            }
+            binding.progress.visibility = View.GONE
             commentsAdapter.updateItems(response.comments)
             nextPage = response.nextpage
             onMoreComments.invoke(response.comments, response.nextpage)

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

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/standard_bottom_sheet"
+        style="@style/Widget.Material3.BottomSheet"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:paddingBottom="20dp"
+        app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <!-- Drag handle for accessibility -->
+            <com.google.android.material.bottomsheet.BottomSheetDragHandleView
+                android:id="@+id/drag_handle"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+            <FrameLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content">
+
+                <androidx.recyclerview.widget.RecyclerView
+                    android:id="@+id/commentsRV"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content" />
+
+                <ProgressBar
+                    android:id="@+id/progress"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:visibility="gone" />
+
+                <TextView
+                    android:id="@+id/errorTV"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:layout_marginVertical="5dp"
+                    android:text="@string/comments_disabled"
+                    android:visibility="gone" />
+
+            </FrameLayout>
+
+        </LinearLayout>
+
+    </FrameLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -396,6 +396,8 @@
     <string name="swipe_controls_summary">Use swipe gesture to adjust the brightness and volume.</string>
     <string name="defaults">Defaults</string>
     <string name="pop_up">Pop-Up</string>
+    <string name="comments_disabled">Comments are disabled by the author.</string>
+    <string name="no_comments_available">This video has no comments available.</string>
 
     <!-- Notification channel strings -->
     <string name="download_channel_name">Download Service</string>