Improved user feedback on subscription import

app/src/main/java/com/github/libretube/util/ImportHelper.kt

@@ -9,6 +9,7 @@ import com.github.libretube.R
 import com.github.libretube.api.RetrofitInstance
 import com.github.libretube.api.SubscriptionHelper
 import com.github.libretube.extensions.TAG
+import com.github.libretube.extensions.toastFromMainThread
 import com.github.libretube.obj.NewPipeSubscription
 import com.github.libretube.obj.NewPipeSubscriptions
 import kotlinx.coroutines.CoroutineScope
@@ -17,56 +18,64 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import java.io.FileOutputStream
 
-class ImportHelper(private val activity: Activity) {
+class ImportHelper(
+    private val activity: Activity
+) {
     /**
      * Import subscriptions by a file uri
      */
     fun importSubscriptions(uri: Uri?) {
         if (uri == null) return
         try {
-            val channels = when (activity.contentResolver.getType(uri)) {
+            val applicationContext = activity.applicationContext
-                "application/json" -> {
+            val channels = getChannelsFromUri(uri)
-                    // NewPipe subscriptions format
-                    val mapper = ObjectMapper()
-                    val json = activity.contentResolver.openInputStream(uri)?.use {
-                        it.bufferedReader().use { reader -> reader.readText() }
-                    }.orEmpty()
-
-                    val subscriptions = mapper.readValue(json, NewPipeSubscriptions::class.java)
-                    subscriptions.subscriptions.orEmpty().map {
-                        it.url!!.replace("https://www.youtube.com/channel/", "")
-                    }
-                }
-                "text/csv", "text/comma-separated-values" -> {
-                    // import subscriptions from Google/YouTube Takeout
-                    activity.contentResolver.openInputStream(uri)?.use {
-                        it.bufferedReader().useLines { lines ->
-                            lines.map { line -> line.substringBefore(",") }
-                                .filter { channelId -> channelId.length == 24 }
-                                .toList()
-                        }
-                    }.orEmpty()
-                }
-                else -> throw IllegalArgumentException("Unsupported file type")
-            }
-
             CoroutineScope(Dispatchers.IO).launch {
                 SubscriptionHelper.importSubscriptions(channels)
+            }.invokeOnCompletion {
+                applicationContext.toastFromMainThread(R.string.importsuccess)
             }
-
+        } catch (e: IllegalArgumentException) {
-            Toast.makeText(activity, R.string.importsuccess, Toast.LENGTH_SHORT).show()
+            Log.e(TAG(), e.toString())
+            Toast.makeText(activity, R.string.unsupported_file_format, Toast.LENGTH_SHORT).show()
         } catch (e: Exception) {
             Log.e(TAG(), e.toString())
-            Toast.makeText(
+            Toast.makeText(activity, R.string.server_error, Toast.LENGTH_SHORT).show()
-                activity,
-                R.string.error,
-                Toast.LENGTH_SHORT
-            ).show()
         }
     }
 
     /**
-     * write the text to the document
+     * Get a list of channel IDs from a file [Uri]
+     */
+    private fun getChannelsFromUri(uri: Uri): List<String> {
+        return when (activity.contentResolver.getType(uri)) {
+            "application/json" -> {
+                // NewPipe subscriptions format
+                val mapper = ObjectMapper()
+                val json = activity.contentResolver.openInputStream(uri)?.use {
+                    it.bufferedReader().use { reader -> reader.readText() }
+                }.orEmpty()
+
+                val subscriptions = mapper.readValue(json, NewPipeSubscriptions::class.java)
+                subscriptions.subscriptions.orEmpty().map {
+                    it.url!!.replace("https://www.youtube.com/channel/", "")
+                }
+            }
+            "text/csv", "text/comma-separated-values" -> {
+                // import subscriptions from Google/YouTube Takeout
+                activity.contentResolver.openInputStream(uri)?.use {
+                    it.bufferedReader().useLines { lines ->
+                        lines.map { line -> line.substringBefore(",") }
+                            .filter { channelId -> channelId.length == 24 }
+                            .toList()
+                    }
+                }.orEmpty()
+            }
+            else -> throw IllegalArgumentException("Unsupported file type")
+        }
+    }
+
+    /**
+     * Write the text to the document
      */
     fun exportSubscriptions(uri: Uri?) {
         if (uri == null) return

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

@@ -372,6 +372,7 @@
     <string name="alternative_player_layout_summary">Show the related videos as a row above the comments instead of below.</string>
     <string name="audio_track">Audio track</string>
     <string name="default_audio_track">Default</string>
+    <string name="unsupported_file_format">Unsupported file format!</string>
 
     <!-- Notification channel strings -->
     <string name="download_channel_name">Download Service</string>