Fix offline details loading

app/src/main/kotlin/org/koitharu/kotatsu/core/os/NetworkState.kt

@@ -19,7 +19,9 @@ class NetworkState(
 	override fun onActive() {
 		invalidate()
 		val request = NetworkRequest.Builder()
-			.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+			.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
+			.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
+			.addTransportType(NetworkCapabilities.TRANSPORT_ETHERNET)
 			.build()
 		connectivityManager.registerNetworkCallback(request, callback)
 	}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Network.kt

@@ -19,6 +19,8 @@ fun ConnectivityManager.isOnline(): Boolean {
 }
 
 private fun ConnectivityManager.isOnline(network: Network): Boolean {
-	val capabilities = getNetworkCapabilities(network)
-	return capabilities != null && capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+	val capabilities = getNetworkCapabilities(network) ?: return false
+	return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
+		|| capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
+		|| capabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)
 }

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

@@ -60,8 +60,7 @@ class DetailsLoadUseCase @Inject constructor(
 		} catch (e: IOException) {
 			local?.await()?.manga?.also { localManga ->
 				send(MangaDetails(localManga, null, localManga.description?.parseAsHtml(withImages = false), true))
-			}
-			throw e
+			} ?: close(e)
 		}
 	}
 

app/src/main/kotlin/org/koitharu/kotatsu/local/data/LocalMangaMappingCache.kt

@@ -0,0 +1,32 @@
+package org.koitharu.kotatsu.local.data
+
+import androidx.collection.MutableLongObjectMap
+import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
+import org.koitharu.kotatsu.local.data.input.LocalMangaInput
+import org.koitharu.kotatsu.local.domain.model.LocalManga
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+import java.io.File
+
+class LocalMangaMappingCache {
+
+	private val map = MutableLongObjectMap<File>()
+
+	suspend fun get(mangaId: Long): LocalManga? {
+		val file = synchronized(this) {
+			map[mangaId]
+		} ?: return null
+		return runCatchingCancellable {
+			LocalMangaInput.of(file).getManga()
+		}.onFailure {
+			it.printStackTraceDebug()
+		}.getOrNull()
+	}
+
+	operator fun set(mangaId: Long, localManga: LocalManga?) = synchronized(this) {
+		if (localManga == null) {
+			map.remove(mangaId)
+		} else {
+			map[mangaId] = localManga.file
+		}
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/local/data/LocalMangaRepository.kt

@@ -51,6 +51,7 @@ class LocalMangaRepository @Inject constructor(
 
 	override val source = MangaSource.LOCAL
 	private val locks = MultiMutex<Long>()
+	private val localMappingCache = LocalMangaMappingCache()
 
 	override val isMultipleTagsSupported: Boolean = true
 	override val isTagsExclusionSupported: Boolean = true
@@ -141,6 +142,10 @@ class LocalMangaRepository @Inject constructor(
 	}
 
 	suspend fun findSavedManga(remoteManga: Manga): LocalManga? = runCatchingCancellable {
+		// very fast path
+		localMappingCache.get(remoteManga.id)?.let {
+			return@runCatchingCancellable it
+		}
 		// fast path
 		LocalMangaInput.find(storageManager.getReadableDirs(), remoteManga)?.let {
 			return it.getManga()
@@ -162,6 +167,8 @@ class LocalMangaRepository @Inject constructor(
 				}
 			}
 		}.firstOrNull()?.getManga()
+	}.onSuccess { x: LocalManga? ->
+		localMappingCache[remoteManga.id] = x
 	}.onFailure {
 		it.printStackTraceDebug()
 	}.getOrNull()