Show new chapters on details

app/src/main/java/org/koitharu/kotatsu/ui/details/ChaptersAdapter.kt

@@ -16,6 +16,13 @@ class ChaptersAdapter(onItemClickListener: OnRecyclerItemClickListener<MangaChap
 			updateCurrentPosition()
 		}
 
+	var newChaptersCount: Int = 0
+		set(value) {
+			val updated = maxOf(field, value)
+			field = value
+			notifyItemRangeChanged(itemCount - updated, updated)
+		}
+
 	var currentChapterPosition = RecyclerView.NO_POSITION
 		private set
 
@@ -24,9 +31,13 @@ class ChaptersAdapter(onItemClickListener: OnRecyclerItemClickListener<MangaChap
 	override fun onGetItemId(item: MangaChapter) = item.id
 
 	override fun getExtra(item: MangaChapter, position: Int): ChapterExtra = when {
-		currentChapterPosition == RecyclerView.NO_POSITION -> ChapterExtra.UNREAD
+		currentChapterPosition == RecyclerView.NO_POSITION
+				|| currentChapterPosition < position -> if (position >= itemCount - newChaptersCount) {
+			ChapterExtra.NEW
+		} else {
+			ChapterExtra.UNREAD
+		}
 		currentChapterPosition == position -> ChapterExtra.CURRENT
-		currentChapterPosition < position -> ChapterExtra.UNREAD
 		currentChapterPosition > position -> ChapterExtra.READ
 		else -> ChapterExtra.UNREAD
 	}

app/src/main/java/org/koitharu/kotatsu/ui/details/ChaptersFragment.kt

@@ -4,6 +4,7 @@ import android.os.Bundle
 import android.view.View
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.fragment_chapters.*
 import moxy.ktx.moxyPresenter
@@ -44,6 +45,7 @@ class ChaptersFragment : BaseFragment(R.layout.fragment_chapters), MangaDetailsV
 	override fun onMangaUpdated(manga: Manga) {
 		this.manga = manga
 		adapter.replaceData(manga.chapters.orEmpty())
+		scrollToCurrent()
 	}
 
 	override fun onLoadingStateChanged(isLoading: Boolean) {
@@ -56,6 +58,11 @@ class ChaptersFragment : BaseFragment(R.layout.fragment_chapters), MangaDetailsV
 
 	override fun onHistoryChanged(history: MangaHistory?) {
 		adapter.currentChapterId = history?.chapterId
+		scrollToCurrent()
+	}
+
+	override fun onNewChaptersChanged(newChapters: Int) {
+		adapter.newChaptersCount = newChapters
 	}
 
 	override fun onFavouriteChanged(categories: List<FavouriteCategory>) = Unit
@@ -86,4 +93,13 @@ class ChaptersFragment : BaseFragment(R.layout.fragment_chapters), MangaDetailsV
 		}
 		return true
 	}
+
+	private fun scrollToCurrent() {
+		val pos = (recyclerView_chapters.adapter as? ChaptersAdapter)?.currentChapterPosition
+			?: RecyclerView.NO_POSITION
+		if (pos != RecyclerView.NO_POSITION) {
+			(recyclerView_chapters.layoutManager as? LinearLayoutManager)
+				?.scrollToPositionWithOffset(pos, 100)
+		}
+	}
 }

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsActivity.kt

@@ -80,6 +80,17 @@ class MangaDetailsActivity : BaseActivity(), MangaDetailsView {
 		}
 	}
 
+	override fun onNewChaptersChanged(newChapters: Int) {
+		val tab = tabs.getTabAt(1) ?: return
+		if (newChapters == 0) {
+			tab.removeBadge()
+		} else {
+			val badge = tab.orCreateBadge
+			badge.number = newChapters
+			badge.isVisible = true
+		}
+	}
+
 	override fun onCreateOptionsMenu(menu: Menu?): Boolean {
 		menuInflater.inflate(R.menu.opt_details, menu)
 		return super.onCreateOptionsMenu(menu)

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsFragment.kt

@@ -93,6 +93,8 @@ class MangaDetailsFragment : BaseFragment(R.layout.fragment_details), MangaDetai
 
 	override fun onMangaRemoved(manga: Manga) = Unit //handled in activity
 
+	override fun onNewChaptersChanged(newChapters: Int) = Unit
+
 	override fun onClick(v: View) {
 		if (v is Chip) {
 			when(val tag = v.tag) {

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsPresenter.kt

@@ -17,6 +17,7 @@ import org.koitharu.kotatsu.domain.favourites.FavouritesRepository
 import org.koitharu.kotatsu.domain.favourites.OnFavouritesChangeListener
 import org.koitharu.kotatsu.domain.history.HistoryRepository
 import org.koitharu.kotatsu.domain.history.OnHistoryChangeListener
+import org.koitharu.kotatsu.domain.tracking.TrackingRepository
 import org.koitharu.kotatsu.ui.common.BasePresenter
 import org.koitharu.kotatsu.utils.ext.safe
 import java.io.IOException
@@ -28,12 +29,14 @@ class MangaDetailsPresenter private constructor() : BasePresenter<MangaDetailsVi
 
 	private lateinit var historyRepository: HistoryRepository
 	private lateinit var favouritesRepository: FavouritesRepository
+	private lateinit var trackingRepository: TrackingRepository
 
 	private var manga: Manga? = null
 
 	override fun onFirstViewAttach() {
 		historyRepository = HistoryRepository()
 		favouritesRepository = FavouritesRepository()
+		trackingRepository = TrackingRepository()
 		super.onFirstViewAttach()
 		HistoryRepository.subscribe(this)
 		FavouritesRepository.subscribe(this)
@@ -75,6 +78,7 @@ class MangaDetailsPresenter private constructor() : BasePresenter<MangaDetailsVi
 				}
 				viewState.onMangaUpdated(data)
 				this@MangaDetailsPresenter.manga = data
+				viewState.onNewChaptersChanged(trackingRepository.getNewChaptersCount(manga.id))
 			} catch (_: CancellationException){
 			} catch (e: Throwable) {
 				if (BuildConfig.DEBUG) {

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsView.kt

@@ -1,8 +1,6 @@
 package org.koitharu.kotatsu.ui.details
 
-import moxy.MvpView
 import moxy.viewstate.strategy.alias.AddToEndSingle
-import moxy.viewstate.strategy.alias.OneExecution
 import moxy.viewstate.strategy.alias.SingleState
 import org.koitharu.kotatsu.core.model.FavouriteCategory
 import org.koitharu.kotatsu.core.model.Manga
@@ -22,4 +20,7 @@ interface MangaDetailsView : BaseMvpView {
 
 	@SingleState
 	fun onMangaRemoved(manga: Manga)
+
+	@AddToEndSingle
+	fun onNewChaptersChanged(newChapters: Int)
 }