Initialize Schnappix Photo Booth application with custom UVC camera, silent Wi-Fi IPP printing, local gallery storage, and kiosk screen pinning support

src/services/storage.ts

@@ -0,0 +1,58 @@
+import * as MediaLibrary from 'expo-media-library';
+import { Platform } from 'react-native';
+
+const ALBUM_NAME = 'Schnappix';
+
+/**
+ * Request necessary media library permissions.
+ * @returns Promise<boolean> True if permissions are granted.
+ */
+export async function requestStoragePermission(): Promise<boolean> {
+  const { status, canAskAgain } = await MediaLibrary.getPermissionsAsync();
+  if (status === 'granted') {
+    return true;
+  }
+  
+  if (canAskAgain) {
+    const { status: newStatus } = await MediaLibrary.requestPermissionsAsync();
+    return newStatus === 'granted';
+  }
+  
+  return false;
+}
+
+/**
+ * Saves a local image file directly to the public DCIM gallery inside the "Schnappix" album.
+ * 
+ * @param localUri The local file URI of the image (temp cached file).
+ * @returns Promise<string> The permanent URI of the saved asset in the gallery.
+ */
+export async function saveToGallery(localUri: string): Promise<string> {
+  const hasPermission = await requestStoragePermission();
+  if (!hasPermission) {
+    throw new Error('Storage permission not granted. Cannot save photo to gallery.');
+  }
+
+  // 1. Create a media asset from the local file
+  const asset = await MediaLibrary.createAssetAsync(localUri);
+  
+  try {
+    // 2. Check if the "Schnappix" album already exists
+    let album = await MediaLibrary.getAlbumAsync(ALBUM_NAME);
+    
+    if (!album) {
+      // 3. If it doesn't exist, create it with our asset
+      await MediaLibrary.createAlbumAsync(ALBUM_NAME, asset, false);
+      console.log(`Created new album "${ALBUM_NAME}" and saved photo.`);
+    } else {
+      // 4. If it exists, add our asset to it
+      await MediaLibrary.addAssetsToAlbumAsync([asset], album, false);
+      console.log(`Saved photo to existing album "${ALBUM_NAME}".`);
+    }
+    
+    return asset.uri;
+  } catch (e: any) {
+    console.error('Error saving asset to album, returning fallback asset URI:', e);
+    return asset.uri;
+  }
+}