package eu.kanade.tachiyomi.source

import android.graphics.drawable.Drawable
import eu.kanade.domain.source.model.SourceData
import eu.kanade.tachiyomi.data.preference.PreferencesHelper
import eu.kanade.tachiyomi.extension.ExtensionManager
import eu.kanade.tachiyomi.source.model.Page
import eu.kanade.tachiyomi.source.model.SChapter
import eu.kanade.tachiyomi.source.model.SManga
import eu.kanade.tachiyomi.util.lang.awaitSingle
import rx.Observable
import uy.kohesive.injekt.Injekt
import uy.kohesive.injekt.api.get

/**
 * A basic interface for creating a source. It could be an online source, a local source, etc...
 */
interface Source {

    /**
     * Id for the source. Must be unique.
     */
    val id: Long

    /**
     * Name of the source.
     */
    val name: String

    val lang: String
        get() = ""

    /**
     * Returns an observable with the updated details for a manga.
     *
     * @param manga the manga to update.
     */
    @Deprecated(
        "Use the 1.x API instead",
        ReplaceWith("getMangaDetails"),
    )
    fun fetchMangaDetails(manga: SManga): Observable<SManga> = throw IllegalStateException("Not used")

    /**
     * Returns an observable with all the available chapters for a manga.
     *
     * @param manga the manga to update.
     */
    @Deprecated(
        "Use the 1.x API instead",
        ReplaceWith("getChapterList"),
    )
    fun fetchChapterList(manga: SManga): Observable<List<SChapter>> = throw IllegalStateException("Not used")

    // TODO: remove direct usages on this method
    /**
     * Returns an observable with the list of pages a chapter has.
     *
     * @param chapter the chapter.
     */
    @Deprecated(
        "Use the 1.x API instead",
        ReplaceWith("getPageList"),
    )
    fun fetchPageList(chapter: SChapter): Observable<List<Page>> = Observable.empty()

    /**
     * [1.x API] Get the updated details for a manga.
     */
    @Suppress("DEPRECATION")
    suspend fun getMangaDetails(manga: SManga): SManga {
        return fetchMangaDetails(manga).awaitSingle()
    }

    /**
     * [1.x API] Get all the available chapters for a manga.
     */
    @Suppress("DEPRECATION")
    suspend fun getChapterList(manga: SManga): List<SChapter> {
        return fetchChapterList(manga).awaitSingle()
    }

    /**
     * [1.x API] Get the list of pages a chapter has.
     */
    @Suppress("DEPRECATION")
    suspend fun getPageList(chapter: SChapter): List<Page> {
        return fetchPageList(chapter).awaitSingle()
    }
}

fun Source.icon(): Drawable? = Injekt.get<ExtensionManager>().getAppIconForSource(this)

fun Source.getPreferenceKey(): String = "source_$id"

fun Source.toSourceData(): SourceData = SourceData(id = id, lang = lang, name = name)

fun Source.getNameForMangaInfo(mergeSources: List<Source>?): String {
    val preferences = Injekt.get<PreferencesHelper>()
    val enabledLanguages = preferences.enabledLanguages().get()
        .filterNot { it in listOf("all", "other") }
    val hasOneActiveLanguages = enabledLanguages.size == 1
    val isInEnabledLanguages = lang in enabledLanguages
    return when {
        // SY -->
        !mergeSources.isNullOrEmpty() -> getMergedSourcesString(
            mergeSources,
            enabledLanguages,
            hasOneActiveLanguages,
        )
        // SY <--
        // For edge cases where user disables a source they got manga of in their library.
        hasOneActiveLanguages && !isInEnabledLanguages -> toString()
        // Hide the language tag when only one language is used.
        hasOneActiveLanguages && isInEnabledLanguages -> name
        else -> toString()
    }
}

// SY -->
private fun getMergedSourcesString(
    mergeSources: List<Source>,
    enabledLangs: List<String>,
    onlyName: Boolean,
): String {
    return if (onlyName) {
        mergeSources.joinToString { source ->
            if (source.lang !in enabledLangs) {
                source.toString()
            } else {
                source.name
            }
        }
    } else {
        mergeSources.joinToString()
    }
}
// SY <--

fun Source.isLocalOrStub(): Boolean = id == LocalSource.ID || this is SourceManager.StubSource