Refactor chapters description

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/adapter/ChapterListItemAD.kt

@@ -26,7 +26,7 @@ fun chapterListItemAD(
 	bind { payloads ->
 		if (payloads.isEmpty()) {
 			binding.textViewTitle.text = item.chapter.name
-			binding.textViewDescription.textAndVisible = item.description()
+			binding.textViewDescription.textAndVisible = item.description
 		}
 		when {
 			item.isCurrent -> {

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/model/ChapterListItem.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.details.ui.model
 
 import android.text.format.DateUtils
+import org.jsoup.internal.StringUtil.StringJoiner
 import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.parsers.model.MangaChapter
 
@@ -10,6 +11,14 @@ data class ChapterListItem(
 	private val uploadDateMs: Long,
 ) : ListModel {
 
+	var description: String? = null
+		private set
+		get() {
+			if (field != null) return field
+			field = buildDescription()
+			return field
+		}
+
 	var uploadDate: CharSequence? = null
 		private set
 		get() {
@@ -38,14 +47,20 @@ data class ChapterListItem(
 	val isNew: Boolean
 		get() = hasFlag(FLAG_NEW)
 
-	fun description(): CharSequence {
-		val number = chapter.number.toString()
-		val scanlator = chapter.scanlator?.takeUnless { it.isBlank() }
-		return when {
-			uploadDate != null && scanlator != null -> "#$number • $uploadDate • $scanlator"
-			scanlator != null -> "#$number • $scanlator"
-			else -> "#$number • $uploadDate"
+	private fun buildDescription(): String {
+		val joiner = StringJoiner(" • ")
+		if (chapter.number != 0) {
+			joiner.add("#").append(chapter.number.toString())
+		}
+		uploadDate?.let { date ->
+			joiner.add(date.toString())
+		}
+		chapter.scanlator?.let { scanlator ->
+			if (scanlator.isNotBlank()) {
+				joiner.add(scanlator)
+			}
 		}
+		return joiner.complete()
 	}
 
 	private fun hasFlag(flag: Int): Boolean {