mihon/app/src/main/java/exh/GalleryAdder.kt

package exh

import android.net.Uri
import com.github.salomonbrys.kotson.*
import com.google.gson.JsonArray
import com.google.gson.JsonObject
import com.google.gson.JsonParser
import eu.kanade.tachiyomi.data.database.DatabaseHelper
import eu.kanade.tachiyomi.data.database.models.Manga
import eu.kanade.tachiyomi.network.NetworkHelper
import eu.kanade.tachiyomi.source.SourceManager
import eu.kanade.tachiyomi.util.syncChaptersWithSource
import exh.metadata.copyTo
import exh.metadata.loadEh
import exh.metadata.loadNhentai
import exh.metadata.models.ExGalleryMetadata
import exh.metadata.models.NHentaiMetadata
import exh.util.defRealm
import io.realm.Realm
import okhttp3.MediaType
import okhttp3.Request
import okhttp3.RequestBody
import timber.log.Timber
import uy.kohesive.injekt.injectLazy
import java.net.MalformedURLException
import java.net.URI
import java.net.URISyntaxException

class GalleryAdder {

    private val db: DatabaseHelper by injectLazy()

    private val sourceManager: SourceManager by injectLazy()

    private val networkHelper: NetworkHelper by injectLazy()

    companion object {
        const val API_BASE = "https://api.e-hentai.org/api.php"
        val JSON = MediaType.parse("application/json; charset=utf-8")!!
    }

    fun getGalleryUrlFromPage(url: String): String {
        val uri = Uri.parse(url)
        val lastSplit = uri.pathSegments.last().split("-")
        val pageNum = lastSplit.last()
        val gallery = lastSplit.first()
        val pageToken = uri.pathSegments.elementAt(1)

        val json = JsonObject()
        json["method"] = "gtoken"
        json["pagelist"] = JsonArray().apply {
            add(JsonArray().apply {
                add(gallery.toInt())
                add(pageToken)
                add(pageNum.toInt())
            })
        }

        val outJson = JsonParser().parse(networkHelper.client.newCall(Request.Builder()
                .url(API_BASE)
                .post(RequestBody.create(JSON, json.toString()))
                .build()).execute().body()!!.string()).obj

        val obj = outJson["tokenlist"].array.first()
        return "${uri.scheme}://${uri.host}/g/${obj["gid"].int}/${obj["token"].string}/"
    }

    fun addGallery(url: String,
                   fav: Boolean = false,
                   forceSource: Long? = null): GalleryAddEvent {
        try {
            val urlObj = Uri.parse(url)
            val source = when (urlObj.host) {
                "g.e-hentai.org", "e-hentai.org" -> EH_SOURCE_ID
                "exhentai.org" -> EXH_SOURCE_ID
                "nhentai.net" -> NHENTAI_SOURCE_ID
                else -> return GalleryAddEvent.Fail.UnknownType(url)
            }

            if(forceSource != null && source != forceSource) {
                return GalleryAddEvent.Fail.UnknownType(url)
            }

            val firstPathSegment = urlObj.pathSegments.firstOrNull()?.toLowerCase()
            val realUrl = when(source) {
                EH_SOURCE_ID, EXH_SOURCE_ID -> when (firstPathSegment) {
                    "g" -> {
                        //Is already gallery page, do nothing
                        url
                    }
                    "s" -> {
                        //Is page, fetch gallery token and use that
                        getGalleryUrlFromPage(url)
                    }
                    else -> return GalleryAddEvent.Fail.UnknownType(url)
                }
                NHENTAI_SOURCE_ID -> when {
                    firstPathSegment == "g" -> url
                    urlObj.pathSegments.size >= 3 -> "https://nhentai.net/g/${urlObj.pathSegments[1]}/"
                    else -> return GalleryAddEvent.Fail.UnknownType(url)
                }
                else -> return GalleryAddEvent.Fail.UnknownType(url)
            }

            val sourceObj = sourceManager.get(source)
                    ?: return GalleryAddEvent.Fail.Error(url, "Could not find EH source!")

            val cleanedUrl = when(source) {
                EH_SOURCE_ID, EXH_SOURCE_ID -> getUrlWithoutDomain(realUrl)
                NHENTAI_SOURCE_ID -> realUrl //nhentai uses URLs directly (oops, my bad when implementing this source)
                else -> return GalleryAddEvent.Fail.UnknownType(url)
            }

            //Use manga in DB if possible, otherwise, make a new manga
            val manga = db.getManga(cleanedUrl, source).executeAsBlocking()
                    ?: Manga.create(source).apply {
                this.url = cleanedUrl
                title = realUrl
            }

            //Copy basics
            manga.copyFrom(sourceObj.fetchMangaDetails(manga).toBlocking().first())

            //Apply metadata
            defRealm { realm ->
                when (source) {
                    EH_SOURCE_ID, EXH_SOURCE_ID ->
                        realm.loadEh(ExGalleryMetadata.galleryId(realUrl),
                                ExGalleryMetadata.galleryToken(realUrl),
                                isExSource(source))?.copyTo(manga)
                    NHENTAI_SOURCE_ID ->
                        realm.loadNhentai(NHentaiMetadata.nhIdFromUrl(realUrl))
                                ?.copyTo(manga)
                    else -> return GalleryAddEvent.Fail.UnknownType(url)
                }
            }

            if (fav) manga.favorite = true

            db.insertManga(manga).executeAsBlocking().insertedId()?.let {
                manga.id = it
            }

            //Fetch and copy chapters
            try {
                sourceObj.fetchChapterList(manga).map {
                    syncChaptersWithSource(db, it, manga, sourceObj)
                }.toBlocking().first()
            } catch (e: Exception) {
                Timber.e(e, "Failed to update chapters for gallery: ${manga.title}!")
                return GalleryAddEvent.Fail.Error(url, "Failed to update chapters for gallery: $url")
            }

            return GalleryAddEvent.Success(url, manga)
        } catch(e: Exception) {
            Timber.e(e, "Could not add gallery!")
            return GalleryAddEvent.Fail.Error(url,
                    ((e.message ?: "Unknown error!") + " (Gallery: $url)").trim())
        }
    }

    private fun getUrlWithoutDomain(orig: String): String {
        try {
            val uri = URI(orig)
            var out = uri.path
            if (uri.query != null)
                out += "?" + uri.query
            if (uri.fragment != null)
                out += "#" + uri.fragment
            return out
        } catch (e: URISyntaxException) {
            return orig
        }
    }
}

sealed class GalleryAddEvent {
    abstract val logMessage: String
    abstract val galleryUrl: String
    open val galleryTitle: String? = null

    class Success(override val galleryUrl: String,
                  val manga: Manga): GalleryAddEvent() {
        override val logMessage = "Added gallery: $galleryTitle"
        override val galleryTitle: String
            get() = manga.title
    }

    sealed class Fail: GalleryAddEvent() {
        class UnknownType(override val galleryUrl: String): Fail() {
            override val logMessage = "Unknown gallery type for gallery: $galleryUrl"
        }

        class Error(override val galleryUrl: String,
                    override val logMessage: String): Fail()
    }
}