Refactor code structure for improved readability and maintainability

app/api/truyen/[id]/chapters/route.ts

@@ -0,0 +1,49 @@
+import { NextResponse } from "next/server"
+import connectToMongoDB from "@/lib/mongoose"
+import { Chapter } from "@/lib/models/chapter"
+
+export async function GET(
+  req: Request,
+  { params }: { params: Promise<{ id: string }> } // `id` is the `novel.id`
+) {
+  try {
+    const { id: novelId } = await params
+    
+    const { searchParams } = new URL(req.url)
+    const page = parseInt(searchParams.get("page") || "1", 10)
+    const limit = parseInt(searchParams.get("limit") || "100", 10)
+
+    await connectToMongoDB()
+
+    const skip = (page - 1) * limit
+
+    const [chapters, totalChapters] = await Promise.all([
+      Chapter.find({ novelId })
+        .sort({ number: 1 })
+        .skip(skip)
+        .limit(limit)
+        .select("number title createdAt") // don't return content
+        .lean(),
+      Chapter.countDocuments({ novelId })
+    ])
+
+    return NextResponse.json({
+      chapters: chapters.map(c => ({
+        id: c._id.toString(),
+        number: c.number,
+        title: c.title,
+        createdAt: (c.createdAt as Date).toISOString()
+      })),
+      totalChapters,
+      totalPages: Math.ceil(totalChapters / limit),
+      currentPage: page
+    })
+
+  } catch (error: any) {
+    console.error("Fetch novel chapters error:", error)
+    return NextResponse.json(
+      { error: "Không thể lấy danh sách chương" },
+      { status: 500 }
+    )
+  }
+}