feat: GetChapters endpoint + tests

src/Domain/Manga/Application/QueryHandler/GetMangaChaptersHandler.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Domain\Manga\Application\QueryHandler;
+
+use App\Domain\Manga\Application\Query\GetMangaChapters;
+use App\Domain\Manga\Application\Response\ChapterListResponse;
+use App\Domain\Manga\Application\Response\ChapterResponse;
+use App\Domain\Manga\Domain\Contract\Repository\MangaRepositoryInterface;
+use App\Domain\Manga\Domain\Exception\MangaNotFoundException;
+
+readonly class GetMangaChaptersHandler
+{
+    public function __construct(
+        private MangaRepositoryInterface $mangaRepository
+    ) {}
+
+    public function handle(GetMangaChapters $query): ChapterListResponse
+    {
+        $manga = $this->mangaRepository->findById($query->mangaId);
+        if (!$manga) {
+            throw new MangaNotFoundException();
+        }
+
+        $chapters = $this->mangaRepository->findChapters(
+            mangaId: $query->mangaId,
+            page: $query->page,
+            limit: $query->limit,
+            sortOrder: $query->sortOrder
+        );
+
+        $total = $this->mangaRepository->countChapters($query->mangaId);
+
+        return new ChapterListResponse(
+            chapters: array_map(
+                fn ($chapter) => new ChapterResponse(
+                    id: $chapter->getId(),
+                    number: $chapter->getNumber(),
+                    title: $chapter->getTitle(),
+                    volume: $chapter->getVolume(),
+                    isVisible: $chapter->isVisible(),
+                    createdAt: $chapter->getCreatedAt()
+                ),
+                $chapters
+            ),
+            total: $total,
+            page: $query->page,
+            limit: $query->limit
+        );
+    }
+}