Add meme view & sharing

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/utilities/meme.ts

@@ -0,0 +1,51 @@
+import { NavigationProp } from '@react-navigation/native';
+import { Dirs, FileSystem } from 'react-native-file-access';
+import { extension } from 'react-native-mime-types';
+import Share from 'react-native-share';
+import Clipboard from '@react-native-clipboard/clipboard';
+import { Meme } from '../database';
+import { ROUTE, RootStackParamList } from '../types';
+
+const favoriteMeme = (realm: Realm, meme: Meme) => {
+  realm.write(() => {
+    meme.isFavorite = !meme.isFavorite;
+  });
+};
+
+const shareMeme = async (meme: Meme) => {
+  const fileExtension = extension(meme.mimeType) as string;
+  const cacheUri = `${Dirs.CacheDir}/${meme.id.toHexString()}.${fileExtension}`;
+  await FileSystem.cp(meme.uri, cacheUri);
+  await Share.open({
+    url: `file://${cacheUri}`,
+    type: meme.mimeType,
+    failOnCancel: false,
+  });
+};
+
+const copyMeme = (meme: Meme) => {
+  Clipboard.setURI(meme.uri);
+};
+
+const editMeme = (
+  navigation: NavigationProp<RootStackParamList>,
+  meme: Meme,
+) => {
+  navigation.navigate(ROUTE.EDIT_MEME, { id: meme.id.toHexString() });
+};
+
+const deleteMeme = async (realm: Realm, meme: Meme) => {
+  await FileSystem.unlink(meme.uri);
+
+  realm.write(() => {
+    for (const tag of meme.tags) {
+      tag.dateModified = new Date();
+      tag.memes.slice(tag.memes.indexOf(meme), 1);
+      tag.memesLength -= 1;
+    }
+
+    realm.delete(meme);
+  });
+};
+
+export { favoriteMeme, shareMeme, copyMeme, editMeme, deleteMeme };