Update progress

app/src/main/kotlin/org/koitharu/kotatsu/details/domain/ProgressUpdateUseCase.kt

@@ -0,0 +1,54 @@
+package org.koitharu.kotatsu.details.domain
+
+import org.koitharu.kotatsu.core.model.findChapter
+import org.koitharu.kotatsu.core.model.isLocal
+import org.koitharu.kotatsu.core.parser.MangaRepository
+import org.koitharu.kotatsu.history.data.HistoryRepository
+import org.koitharu.kotatsu.history.data.PROGRESS_NONE
+import org.koitharu.kotatsu.local.data.LocalMangaRepository
+import org.koitharu.kotatsu.parsers.model.Manga
+import javax.inject.Inject
+
+class ProgressUpdateUseCase @Inject constructor(
+	private val mangaRepositoryFactory: MangaRepository.Factory,
+	private val historyRepository: HistoryRepository,
+	private val localMangaRepository: LocalMangaRepository,
+) {
+
+	suspend operator fun invoke(manga: Manga): Float {
+		val history = historyRepository.getOne(manga) ?: return PROGRESS_NONE
+		val seed = if (manga.isLocal) {
+			localMangaRepository.getRemoteManga(manga) ?: manga
+		} else {
+			manga
+		}
+		val repo = mangaRepositoryFactory.create(seed.source)
+		val details = if (manga.source != seed.source || seed.chapters.isNullOrEmpty()) {
+			repo.getDetails(seed)
+		} else {
+			seed
+		}
+		val chapter = details.findChapter(history.chapterId) ?: return PROGRESS_NONE
+		val chapters = details.getChapters(chapter.branch) ?: return PROGRESS_NONE
+		val chaptersCount = chapters.size
+		if (chaptersCount == 0) {
+			return PROGRESS_NONE
+		}
+		val chapterIndex = chapters.indexOfFirst { x -> x.id == history.chapterId }
+		val pagesCount = repo.getPages(chapter).size
+		if (pagesCount == 0) {
+			return PROGRESS_NONE
+		}
+		val pagePercent = (history.page + 1) / pagesCount.toFloat()
+		val ppc = 1f / chaptersCount
+		val result = ppc * chapterIndex + ppc * pagePercent
+		historyRepository.addOrUpdate(
+			manga = details,
+			chapterId = chapter.id,
+			page = history.page,
+			scroll = history.scroll,
+			percent = result,
+		)
+		return result
+	}
+}

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

@@ -13,6 +13,7 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.filterNot
 import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.map
@@ -38,6 +39,7 @@ import org.koitharu.kotatsu.details.data.MangaDetails
 import org.koitharu.kotatsu.details.domain.BranchComparator
 import org.koitharu.kotatsu.details.domain.DetailsInteractor
 import org.koitharu.kotatsu.details.domain.DetailsLoadUseCase
+import org.koitharu.kotatsu.details.domain.ProgressUpdateUseCase
 import org.koitharu.kotatsu.details.domain.RelatedMangaUseCase
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.HistoryInfo
@@ -70,6 +72,7 @@ class DetailsViewModel @Inject constructor(
 	private val relatedMangaUseCase: RelatedMangaUseCase,
 	private val extraProvider: ListExtraProvider,
 	private val detailsLoadUseCase: DetailsLoadUseCase,
+	private val progressUpdateUseCase: ProgressUpdateUseCase,
 ) : BaseViewModel() {
 
 	private val intent = MangaIntent(savedStateHandle)
@@ -203,6 +206,13 @@ class DetailsViewModel @Inject constructor(
 				onShowTip.call(Unit)
 			}
 		}
+		launchJob(Dispatchers.Default) {
+			val manga = details.firstOrNull { !it?.chapters.isNullOrEmpty() } ?: return@launchJob
+			val h = history.firstOrNull()
+			if (h != null) {
+				progressUpdateUseCase(manga.toManga())
+			}
+		}
 	}
 
 	fun reload() {