Initial commit

packages/media/src/application/use-cases/get-media.use-case.ts

@@ -0,0 +1,26 @@
+import { z } from "zod";
+
+import { MediaNotFoundError } from "../../entities/errors/media";
+import { mediaSchema } from "../../entities/models/media";
+import type { IMediaRepository } from "../repositories/media.repository.interface";
+
+// ── Input ────────────────────────────────────────────────────────────────
+export const getMediaInputSchema = z.object({ id: z.string().min(1) }).strict();
+export type GetMediaInput = z.infer<typeof getMediaInputSchema>;
+
+// ── Output ───────────────────────────────────────────────────────────────
+export const getMediaOutputSchema = mediaSchema;
+export type GetMediaOutput = z.infer<typeof getMediaOutputSchema>;
+
+// ── Use case ─────────────────────────────────────────────────────────────
+export type IGetMediaUseCase = ReturnType<typeof getMediaUseCase>;
+
+export const getMediaUseCase =
+  (mediaRepository: IMediaRepository) =>
+  async (input: GetMediaInput): Promise<GetMediaOutput> => {
+    const media = await mediaRepository.getMedia(input.id);
+    if (!media) {
+      throw new MediaNotFoundError(`Media with id "${input.id}" not found`);
+    }
+    return getMediaOutputSchema.parse(media);
+  };