MangaGg: Fix chapter list (#2056)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/Mangagg.kt

@@ -1,13 +1,69 @@
 package org.koitharu.kotatsu.parsers.site.madara.en
 
+import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
+import org.koitharu.kotatsu.parsers.model.MangaChapter
 import org.koitharu.kotatsu.parsers.model.MangaParserSource
 import org.koitharu.kotatsu.parsers.site.madara.MadaraParser
+import org.koitharu.kotatsu.parsers.util.attrAsRelativeUrl
+import org.koitharu.kotatsu.parsers.util.generateUid
+import org.koitharu.kotatsu.parsers.util.parseHtml
+import org.koitharu.kotatsu.parsers.util.removeSuffix
+import org.koitharu.kotatsu.parsers.util.selectFirstOrThrow
+import org.koitharu.kotatsu.parsers.util.toAbsoluteUrl
+import java.text.SimpleDateFormat
 
 @MangaSourceParser("MANGAGG", "MangaGg", "en")
 internal class Mangagg(context: MangaLoaderContext) :
 	MadaraParser(context, MangaParserSource.MANGAGG, "mangagg.com") {
 	override val tagPrefix = "genre/"
 	override val datePattern = "MM/dd/yyyy"
+
+	override suspend fun loadChapters(mangaUrl: String, document: Document): List<MangaChapter> {
+		val chapters = mutableListOf<MangaChapter>()
+		var page = 1
+
+		while (true) {
+			val url = mangaUrl.toAbsoluteUrl(domain).removeSuffix('/') + "/ajax/chapters/?t=$page"
+			val doc = webClient.httpPost(url, emptyMap()).parseHtml()
+			val pageChapters = parseChapterPage(doc)
+
+			if (pageChapters.isEmpty()) {
+				break
+			}
+
+			chapters.addAll(pageChapters)
+			page++
+		}
+
+		return chapters.reversed().mapIndexed { index, chapter ->
+			chapter.copy(number = index + 1f)
+		}
+	}
+
+	private fun parseChapterPage(doc: Document): List<MangaChapter> {
+		val dateFormat = SimpleDateFormat(datePattern, sourceLocale)
+		return doc.select(selectChapter).map { li ->
+			val a = li.selectFirstOrThrow("a")
+			val href = a.attrAsRelativeUrl("href")
+			val link = href + stylePage
+			val dateText = li.selectFirst("a.c-new-tag")?.attr("title") ?: li.selectFirst(selectDate)?.text()
+			val name = a.selectFirst("p")?.text() ?: a.ownText()
+			MangaChapter(
+				id = generateUid(href),
+				title = name,
+				number = 0f,
+				volume = 0,
+				url = link,
+				uploadDate = parseChapterDate(
+					dateFormat,
+					dateText,
+				),
+				source = source,
+				scanlator = null,
+				branch = null,
+			)
+		}
+	}
 }