feat: add sort to GET /authors endpoint

src/routes/authors/getMany.ts

@@ -1,24 +1,44 @@
 import { FastifyInstance } from "fastify";
-import { Static } from "@sinclair/typebox";
+import { Type, Static } from "@sinclair/typebox";
 
 import * as Authors from "../../services/authors";
 import { PaginatedTypeBox } from "../../services/paginated";
 
 const GetAuthorsResponse = PaginatedTypeBox(Authors.AuthorResponse);
 type GetAuthorsResponse = Static<typeof GetAuthorsResponse>;
 
+const GetAuthorsQuery = Type.Object({
+  sortOrder: Type.Optional(
+    Type.String({
+      enum: ["asc", "desc"],
+    })
+  ),
+  sortKey: Type.Optional(
+    Type.String({
+      enum: ["name", "created_at", "updated_at"],
+    })
+  ),
+});
+type GetAuthorsQuery = Static<typeof GetAuthorsQuery>;
+
 export const registerGetAuthors = (app: FastifyInstance) => {
   app.get<{
+    Querystring: GetAuthorsQuery;
     Reply: GetAuthorsResponse;
   }>(
     `/authors`,
     {
       schema: {
+        querystring: GetAuthorsQuery,
         response: { 200: GetAuthorsResponse },
       },
     },
     (request, reply) => {
-      const authors = Authors.getMany();
+      const sort = {
+        order: request.query.sortOrder ?? "asc",
+        key: request.query.sortKey ?? "name",
+      } as Parameters<typeof Authors.getMany>["0"];
+      const authors = Authors.getMany(sort);
       reply.code(200).send({
         has_more_data: false,
         data: authors,

src/services/authors.ts

@@ -59,8 +59,18 @@ export function update(
   return author ?? null;
 }
 
-export function getMany(): AuthorResponse[] {
-  return [...authorDatabase.values()];
+export function getMany(sort: {
+  key: "name" | "created_at" | "updated_at";
+  order: "asc" | "desc";
+}): AuthorResponse[] {
+  return [...authorDatabase.values()].sort((a, b) => {
+    const comparison =
+      sort.key === "name"
+        ? a.name.localeCompare(b.name)
+        : new Date(a[sort.key]).getTime() - new Date(b[sort.key]).getTime();
+    const order = sort.order === "asc" ? 1 : -1;
+    return comparison * order;
+  });
 }
 
 export function get(id: string): AuthorResponse | null {