feat: Reader beginning

src/Domain/Reader/Application/QueryHandler/GetChapterPagesHandler.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Domain\Reader\Application\QueryHandler;
+
+use App\Domain\Reader\Application\Query\GetChapterPages;
+use App\Domain\Reader\Application\Response\ChapterPagesResponse;
+use App\Domain\Reader\Domain\Contract\Repository\ChapterRepositoryInterface;
+use App\Domain\Reader\Domain\Exception\ChapterNotFoundException;
+use App\Domain\Reader\Domain\ValueObject\ChapterId;
+
+final readonly class GetChapterPagesHandler
+{
+    public function __construct(
+        private ChapterRepositoryInterface $chapterRepository
+    ) {
+    }
+
+    public function handle(GetChapterPages $query): ChapterPagesResponse
+    {
+        $chapterId = new ChapterId($query->getChapterId());
+
+        $totalItems = $this->chapterRepository->getTotalPagesForChapter($chapterId);
+
+        if ($totalItems === 0) {
+            throw ChapterNotFoundException::forChapter($chapterId);
+        }
+
+        $pages = $this->chapterRepository->getPagesForChapter(
+            $chapterId,
+            $query->getPage(),
+            $query->getItemsPerPage()
+        );
+
+        return new ChapterPagesResponse(
+            $pages,
+            $totalItems,
+            $query->getPage(),
+            $query->getItemsPerPage()
+        );
+    }
+}