lively/src/services/media/gallery.service.ts

import * as MediaLibrary from "expo-media-library";
import * as ImageManipulator from "expo-image-manipulator";
import { Dimensions } from "react-native";

const { width: SCREEN_WIDTH, height: SCREEN_HEIGHT } = Dimensions.get("screen");

export async function requestGalleryPermission(): Promise<boolean> {
  const { status } = await MediaLibrary.requestPermissionsAsync();
  return status === "granted";
}

export async function getRecentPhotos(
  count: number = 50,
  offset: number = 0
): Promise<{ assets: MediaLibrary.Asset[]; hasMore: boolean }> {
  const query = new MediaLibrary.Query()
    .eq(MediaLibrary.AssetField.MEDIA_TYPE, MediaLibrary.MediaType.IMAGE)
    .orderBy({
      key: MediaLibrary.AssetField.CREATION_TIME,
      ascending: false,
    })
    .limit(count)
    .offset(offset);

  const assets = await query.exe();

  return {
    assets,
    hasMore: assets.length === count,
  };
}

export async function prepareImageForWallpaper(
  uri: string
): Promise<string> {
  const result = await ImageManipulator.manipulateAsync(
    uri,
    [
      {
        resize: {
          width: SCREEN_WIDTH * 2,
          height: SCREEN_HEIGHT * 2,
        },
      },
    ],
    { compress: 0.95, format: ImageManipulator.SaveFormat.JPEG }
  );

  return result.uri;
}