Handle manga links

app/src/main/kotlin/org/koitharu/kotatsu/core/db/dao/MangaDao.kt

@@ -19,6 +19,10 @@ abstract class MangaDao {
 	@Query("SELECT * FROM manga WHERE manga_id = :id")
 	abstract suspend fun find(id: Long): MangaWithTags?
 
+	@Transaction
+	@Query("SELECT * FROM manga WHERE public_url = :publicUrl")
+	abstract suspend fun findByPublicUrl(publicUrl: String): MangaWithTags?
+
 	@Transaction
 	@Query("SELECT * FROM manga WHERE (title LIKE :query OR alt_title LIKE :query) AND manga_id IN (SELECT manga_id FROM favourites UNION SELECT manga_id FROM history) LIMIT :limit")
 	abstract suspend fun searchByTitle(query: String, limit: Int): List<MangaWithTags>

app/src/main/kotlin/org/koitharu/kotatsu/core/model/Manga.kt

@@ -1,5 +1,6 @@
 package org.koitharu.kotatsu.core.model
 
+import android.net.Uri
 import androidx.core.os.LocaleListCompat
 import org.koitharu.kotatsu.core.util.ext.iterator
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
@@ -66,3 +67,10 @@ fun Manga.getPreferredBranch(history: MangaHistory?): String? {
 
 val Manga.isLocal: Boolean
 	get() = source == MangaSource.LOCAL
+
+val Manga.appUrl: Uri
+	get() = Uri.parse("https://kotatsu.app/manga").buildUpon()
+		.appendQueryParameter("source", source.name)
+		.appendQueryParameter("name", title)
+		.appendQueryParameter("url", url)
+		.build()

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaDataRepository.kt

@@ -17,10 +17,12 @@ import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.model.MangaTag
 import org.koitharu.kotatsu.reader.domain.ReaderColorFilter
 import javax.inject.Inject
+import javax.inject.Provider
 
 @Reusable
 class MangaDataRepository @Inject constructor(
 	private val db: MangaDatabase,
+	private val resolverProvider: Provider<MangaLinkResolver>,
 ) {
 
 	suspend fun saveReaderMode(manga: Manga, mode: ReaderMode) {
@@ -63,10 +65,15 @@ class MangaDataRepository @Inject constructor(
 		return db.mangaDao.find(mangaId)?.toManga()
 	}
 
+	suspend fun findMangaByPublicUrl(publicUrl: String): Manga? {
+		return db.mangaDao.findByPublicUrl(publicUrl)?.toManga()
+	}
+
 	suspend fun resolveIntent(intent: MangaIntent): Manga? = when {
 		intent.manga != null -> intent.manga
 		intent.mangaId != 0L -> findMangaById(intent.mangaId)
-		else -> null // TODO resolve uri
+		intent.uri != null -> resolverProvider.get().resolve(intent.uri)
+		else -> null
 	}
 
 	suspend fun storeManga(manga: Manga) {

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaLinkResolver.kt

@@ -0,0 +1,119 @@
+package org.koitharu.kotatsu.core.parser
+
+import android.net.Uri
+import dagger.Reusable
+import org.koitharu.kotatsu.core.model.MangaSource
+import org.koitharu.kotatsu.core.util.ext.ifNullOrEmpty
+import org.koitharu.kotatsu.explore.data.MangaSourcesRepository
+import org.koitharu.kotatsu.parsers.exception.NotFoundException
+import org.koitharu.kotatsu.parsers.model.ContentType
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaSource
+import org.koitharu.kotatsu.parsers.util.almostEquals
+import org.koitharu.kotatsu.parsers.util.levenshteinDistance
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+import org.koitharu.kotatsu.parsers.util.toRelativeUrl
+import javax.inject.Inject
+
+@Reusable
+class MangaLinkResolver @Inject constructor(
+	private val repositoryFactory: MangaRepository.Factory,
+	private val sourcesRepository: MangaSourcesRepository,
+	private val dataRepository: MangaDataRepository,
+) {
+
+	suspend fun resolve(uri: Uri): Manga {
+		return if (uri.host == "kotatsu.app") {
+			resolveAppLink(uri)
+		} else {
+			resolveExternalLink(uri)
+		} ?: throw NotFoundException("Manga not found", uri.toString())
+	}
+
+	suspend fun resolveAppLink(uri: Uri): Manga? {
+		require(uri.pathSegments.singleOrNull() == "manga") { "Invalid url" }
+		val sourceName = requireNotNull(uri.getQueryParameter("source")) { "Source is not specified" }
+		val source = MangaSource(sourceName)
+		require(source != MangaSource.DUMMY) { "Manga source $sourceName is not supported" }
+		val repo = repositoryFactory.create(source)
+		return repo.findExact(
+			url = uri.getQueryParameter("url"),
+			title = uri.getQueryParameter("name"),
+		)
+	}
+
+	suspend fun resolveExternalLink(uri: Uri): Manga? {
+		dataRepository.findMangaByPublicUrl(uri.toString())?.let {
+			return it
+		}
+		val host = uri.host ?: return null
+		val repo = sourcesRepository.allMangaSources.asSequence()
+			.map { source ->
+				repositoryFactory.create(source) as RemoteMangaRepository
+			}.find { repo ->
+				host in repo.domains
+			} ?: return null
+		return repo.findExact(uri.toString().toRelativeUrl(host), null)
+	}
+
+	private suspend fun MangaRepository.findExact(url: String?, title: String?): Manga? {
+		if (!title.isNullOrEmpty()) {
+			val list = getList(0, title)
+			if (url != null) {
+				list.find { it.url == url }?.let {
+					return it
+				}
+			}
+			list.minByOrNull { it.title.levenshteinDistance(title) }
+				?.takeIf { it.title.almostEquals(title, 0.2f) }
+				?.let { return it }
+		}
+		val seed = getDetailsNoCache(
+			getSeedManga(source, url ?: return null, title),
+		)
+		return runCatchingCancellable {
+			val seedTitle = seed.title.ifEmpty {
+				seed.altTitle
+			}.ifNullOrEmpty {
+				seed.author
+			} ?: return@runCatchingCancellable null
+			val seedList = getList(0, seedTitle)
+			seedList.first { x -> x.url == url }
+		}.getOrThrow()
+	}
+
+	private suspend fun MangaRepository.getDetailsNoCache(manga: Manga): Manga {
+		return if (this is RemoteMangaRepository) {
+			getDetails(manga, withCache = false)
+		} else {
+			getDetails(manga)
+		}
+	}
+
+	private fun getSeedManga(source: MangaSource, url: String, title: String?) = Manga(
+		id = run {
+			var h = 1125899906842597L
+			source.name.forEach { c ->
+				h = 31 * h + c.code
+			}
+			url.forEach { c ->
+				h = 31 * h + c.code
+			}
+			h
+		},
+		title = title.orEmpty(),
+		altTitle = null,
+		url = url,
+		publicUrl = "",
+		rating = 0.0f,
+		isNsfw = source.contentType == ContentType.HENTAI,
+		coverUrl = "",
+		tags = emptySet(),
+		state = null,
+		author = null,
+		largeCoverUrl = null,
+		description = null,
+		chapters = null,
+		source = source,
+	)
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/RemoteMangaRepository.kt

@@ -51,6 +51,9 @@ class RemoteMangaRepository(
 			getConfig()[parser.configKeyDomain] = value
 		}
 
+	val domains: Array<out String>
+		get() = parser.configKeyDomain.presetValues
+
 	val headers: Headers
 		get() = parser.headers
 
@@ -70,14 +73,7 @@ class RemoteMangaRepository(
 		return parser.getList(offset, tags, sortOrder)
 	}
 
-	override suspend fun getDetails(manga: Manga): Manga {
-		cache.getDetails(source, manga.url)?.let { return it }
-		val details = asyncSafe {
-			parser.getDetails(manga)
-		}
-		cache.putDetails(source, manga.url, details)
-		return details.await()
-	}
+	override suspend fun getDetails(manga: Manga): Manga = getDetails(manga, withCache = true)
 
 	override suspend fun getPages(chapter: MangaChapter): List<MangaPage> {
 		cache.getPages(source, chapter.url)?.let { return it }
@@ -103,6 +99,18 @@ class RemoteMangaRepository(
 		return related.await()
 	}
 
+	suspend fun getDetails(manga: Manga, withCache: Boolean): Manga {
+		if (!withCache) {
+			return parser.getDetails(manga)
+		}
+		cache.getDetails(source, manga.url)?.let { return it }
+		val details = asyncSafe {
+			parser.getDetails(manga)
+		}
+		cache.putDetails(source, manga.url, details)
+		return details.await()
+	}
+
 	fun getAuthProvider(): MangaParserAuthProvider? = parser as? MangaParserAuthProvider
 
 	fun getConfigKeys(): List<ConfigKey<*>> = ArrayList<ConfigKey<*>>().also {

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

@@ -8,6 +8,7 @@ import androidx.core.content.FileProvider
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.logs.FileLogger
+import org.koitharu.kotatsu.core.model.appUrl
 import org.koitharu.kotatsu.parsers.model.Manga
 import java.io.File
 
@@ -22,6 +23,8 @@ class ShareHelper(private val context: Context) {
 			append(manga.title)
 			append("\n \n")
 			append(manga.publicUrl)
+			append("\n \n")
+			append(manga.appUrl)
 		}
 		ShareCompat.IntentBuilder(context)
 			.setText(text)

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

@@ -4,7 +4,7 @@ import androidx.annotation.FloatRange
 import org.koitharu.kotatsu.parsers.util.levenshteinDistance
 import java.util.UUID
 
-inline fun <C : CharSequence> C?.ifNullOrEmpty(defaultValue: () -> C): C {
+inline fun <C : CharSequence?> C?.ifNullOrEmpty(defaultValue: () -> C): C {
 	return if (this.isNullOrEmpty()) defaultValue() else this
 }