feat: add createHiddenFilesBatch to client (#20)

* feat: add createHiddenFilesBatch to client

Batch-upload many hidden files in one multipart request, for uploading
large 3D-tile sets (point clouds / gaussian splats) without hitting the
per-file upload throttle. Pairs with POST /api/item/hidden/batch.

* chore: add changeset for createHiddenFilesBatch

Author: ABujalance

.changeset/batch-hidden-files.md

@@ -0,0 +1,8 @@
+---
+"@thatopen/services": minor
+---
+
+Add `EngineServicesClient.createHiddenFilesBatch()` to upload many hidden files
+in a single request, for large 3D-tile sets (point clouds / gaussian splats)
+without hitting the per-file upload throttle. Exports the
+`CreateHiddenItemsBatchResult` type.

src/core/client.ts

@@ -18,6 +18,7 @@ import {
 import { CreateItemResponse, UpdateItemResponse } from '../types/response';
 import {
   CreateHiddenItemResult,
+  CreateHiddenItemsBatchResult,
   HiddenFileEntity,
   Metadata,
 } from '../types/files';
@@ -1181,6 +1182,30 @@ export class EngineServicesClient {
     );
   }
 
+  /**
+   * Creates many hidden files attached to a parent item in a single request.
+   * Use this instead of many `createHiddenFile` calls when uploading large sets
+   * (e.g. 3D Tiles); upload in chunks of up to 100 files per call.
+   * @param files - The files to upload.
+   * @param parentFileId - The parent item's unique identifier.
+   * @returns One result per uploaded file, in order, each with its hidden file ID.
+   */
+  async createHiddenFilesBatch(files: (File | Blob)[], parentFileId: string) {
+    const formData = new FormData();
+    for (const file of files) {
+      formData.append('files', file);
+    }
+    formData.append('parentItemId', parentFileId);
+
+    return await this.#requestApi<CreateHiddenItemsBatchResult>(
+      'POST',
+      `${ITEM_PATH}/${HIDDEN_PATH}/batch`,
+      {
+        body: formData,
+      },
+    );
+  }
+
   /**
    * Deletes a hidden file by its ID.
    * @param hiddenId - The hidden file's unique identifier.

src/types/files.ts

@@ -13,6 +13,10 @@ export type CreateHiddenItemResult = {
   hiddenFileId: string;
 };
 
+export type CreateHiddenItemsBatchResult = {
+  results: { originalName: string; hiddenFileId: string }[];
+};
+
 export type MetadataValue = string | number | boolean | null;
 
 export type Metadata = Record<string, MetadataValue>;