Add Sections query

Author: lorensr

app/src/main/graphql/guide/graphql/toc/Sections.graphql

@@ -0,0 +1,8 @@
+query Sections($id: Int!) {
+  chapter(id: $id) {
+    sections {
+      number
+      title
+    }
+  }
+}

app/src/main/java/guide/graphql/toc/ui/sections/SectionsAdapter.kt

@@ -5,23 +5,40 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 import guide.graphql.toc.R
+import guide.graphql.toc.SectionsQuery
 import guide.graphql.toc.databinding.SectionBinding
 
 class SectionsAdapter(
     private val context: Context,
-    private val chapterNumber: Int
+    private val chapterNumber: Int,
+    private var sections: List<SectionsQuery.Section> = listOf()
 ) : RecyclerView.Adapter<SectionsAdapter.ViewHolder>() {
 
+    fun updateSections(sections: List<SectionsQuery.Section>) {
+        this.sections = sections
+        notifyDataSetChanged()
+    }
+
     class ViewHolder(val binding: SectionBinding) : RecyclerView.ViewHolder(binding.root)
 
     override fun getItemCount(): Int {
-        return 0
+        return sections.size
     }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
         val binding = SectionBinding.inflate(LayoutInflater.from(parent.context), parent, false)
         return ViewHolder(binding)
     }
 
-    override fun onBindViewHolder(holder: ViewHolder, position: Int) {}
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val section = sections[position]
+        section.let {
+            holder.binding.sectionTitle.text = context.getString(
+                R.string.section_title,
+                chapterNumber.toString(),
+                section.number.toString(),
+                section.title
+            )
+        }
+    }
 }

app/src/main/java/guide/graphql/toc/ui/sections/SectionsFragment.kt

@@ -5,10 +5,15 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.navArgs
 import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.LinearLayoutManager
+import com.apollographql.apollo.coroutines.toDeferred
+import com.apollographql.apollo.exception.ApolloException
 import com.google.android.material.transition.MaterialSharedAxis
+import guide.graphql.toc.SectionsQuery
+import guide.graphql.toc.data.Apollo
 import guide.graphql.toc.databinding.SectionsFragmentBinding
 
 class SectionsFragment : Fragment() {
@@ -52,7 +57,33 @@ class SectionsFragment : Fragment() {
         binding.sections.addItemDecoration(itemDivider)
         binding.sections.adapter = adapter
 
-        showErrorMessage("No sections")
+        lifecycleScope.launchWhenStarted {
+            binding.spinner.visibility = View.VISIBLE
+            binding.error.visibility = View.GONE
+            try {
+                val response = Apollo.client.query(
+                    SectionsQuery(id = args.chapterId)
+                ).toDeferred().await()
+
+                if (response.hasErrors()) {
+                    throw Exception("Response has errors")
+                }
+
+                val sections = response.data?.chapter?.sections ?: throw Exception("Data is null")
+
+                if (sections.size > 1) {
+                    adapter.updateSections(sections)
+                    binding.spinner.visibility = View.GONE
+                    binding.error.visibility = View.GONE
+                } else {
+                    throw Exception("No sections")
+                }
+            } catch (e: ApolloException) {
+                showErrorMessage("GraphQL request failed")
+            } catch (e: Exception) {
+                showErrorMessage(e.message.orEmpty())
+            }
+        }
     }
 
     override fun onDestroyView() {