Tweak new chapters notification wording

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -501,7 +501,7 @@ class LibraryUpdateService(
         return notification(Notifications.CHANNEL_NEW_CHAPTERS) {
             setContentTitle(manga.title)
 
-            val description = getChaptersDescriptionString(chapters)
+            val description = getNewChaptersDescription(chapters)
             setContentText(description)
             setStyle(NotificationCompat.BigTextStyle().bigText(description))
 
@@ -554,28 +554,47 @@ class LibraryUpdateService(
         }
     }
 
-    private fun getChaptersDescriptionString(chapters: Array<Chapter>): String {
+    private fun getNewChaptersDescription(chapters: Array<Chapter>): String {
         val formatter = DecimalFormat("#.###", DecimalFormatSymbols()
                 .apply { decimalSeparator = '.' })
 
-        val chapterNumbers = chapters
+        val displayableChapterNumbers = chapters
+                .filter { it.chapter_number >= 0 }
                 .sortedBy { it.chapter_number }
                 .map { formatter.format(it.chapter_number) }
                 .toSet()
 
-        val shouldTruncate = chapterNumbers.size > NOTIF_MAX_CHAPTERS
-        val chaptersDescription = if (shouldTruncate) {
-            chapterNumbers.take(NOTIF_MAX_CHAPTERS - 1).joinToString(", ")
-        } else {
-            chapterNumbers.joinToString(", ")
-        }
-
-        var description = resources.getQuantityString(R.plurals.notification_chapters, chapters.size, chaptersDescription)
-        if (shouldTruncate) {
-            description += " ${resources.getString(R.string.notification_and_n_more, (chapterNumbers.size - (NOTIF_MAX_CHAPTERS - 1)))}"
+        return when (displayableChapterNumbers.size) {
+            // No sensible chapter numbers to show (i.e. no chapters have parsed chapter number)
+            0 -> {
+                // "1 new chapter" or "5 new chapters"
+                resources.getQuantityString(R.plurals.notification_chapters_generic, chapters.size, chapters.size)
+            }
+            // Only 1 chapter has a parsed chapter number
+            1 -> {
+                val remaining = chapters.size - displayableChapterNumbers.size
+                if (remaining == 0) {
+                    // "Chapter 2.5"
+                    resources.getString(R.string.notification_chapters_single, displayableChapterNumbers.first())
+                } else {
+                    // "Chapter 2.5 and 10 more"
+                    resources.getString(R.string.notification_chapters_single_and_more, displayableChapterNumbers.first(), remaining)
+                }
+            }
+            // Everything else (i.e. multiple parsed chapter numbers)
+            else -> {
+                val shouldTruncate = displayableChapterNumbers.size > NOTIF_MAX_CHAPTERS
+                if (shouldTruncate) {
+                    // "Chapters 1, 2.5, 3, 4, 5 and 10 more"
+                    val remaining = displayableChapterNumbers.size - NOTIF_MAX_CHAPTERS
+                    val joinedChapterNumbers = displayableChapterNumbers.take(NOTIF_MAX_CHAPTERS).joinToString(", ")
+                    resources.getQuantityString(R.plurals.notification_chapters_multiple_and_more, remaining, joinedChapterNumbers, remaining)
+                } else {
+                    // "Chapters 1, 2.5, 3"
+                    resources.getString(R.string.notification_chapters_multiple, displayableChapterNumbers.joinToString(","))
+                }
+            }
         }
-
-        return description
     }
 
     /**

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

@@ -507,14 +507,20 @@
     <string name="notification_update_progress">Update progress: %1$d/%2$d</string>
     <string name="notification_new_chapters">New chapters found</string>
     <plurals name="notification_new_chapters_text">
-        <item quantity="one">For %d title</item>
+        <item quantity="one">For 1 title</item>
         <item quantity="other">For %d titles</item>
     </plurals>
-    <plurals name="notification_chapters">
-        <item quantity="one">Chapter %1$s</item>
-        <item quantity="other">Chapters %1$s</item>
+    <plurals name="notification_chapters_generic">
+        <item quantity="one">1 new chapter</item>
+        <item quantity="other">%1$d new chapters</item>
+    </plurals>
+    <string name="notification_chapters_single">Chapter %1$s</string>
+    <string name="notification_chapters_single_and_more">Chapter %1$s and %2$d more</string>
+    <string name="notification_chapters_multiple">Chapters %1$s</string>
+    <plurals name="notification_chapters_multiple_and_more">
+        <item quantity="one">Chapter %1$s and 1 more</item>
+        <item quantity="other">Chapters %1$s and %2$d more</item>
     </plurals>
-    <string name="notification_and_n_more">and %1$d more</string>
     <string name="notification_cover_update_failed">Failed to update cover</string>
     <string name="notification_first_add_to_library">Please add the manga to your library before doing this</string>
     <string name="notification_not_connected_to_ac_title">Sync canceled</string>