import * as MediaLibrary from "expo-media-library";
import * as FileSystem from "expo-file-system";
import Toast from "react-native-toast-message";

export default async function saveImage(uri) {
  const permission = await MediaLibrary.requestPermissionsAsync();
  if (permission.granted) {
    const timestamp = new Date().getTime();
    const fileUri = FileSystem.cacheDirectory + `${timestamp}.png`;
    try {
      const res = await FileSystem.downloadAsync(uri, fileUri);
      await MediaLibrary.saveToLibraryAsync(res.uri);
      Toast.show({
        type: "success",
        text1: "已保存到相册",
        topOffset: 60,
      });
      return true;
    } catch (err) {
      console.error("FS Err: ", err);
      return false;
    }
  } else {
    Toast.show({
      type: "error",
      text1: "保存失败，请检查APP媒体权限",
      topOffset: 60,
    });
    return false;
  }
}