[TMA-461] Notifications Screen (#151)

* renamed ProfileStack to MainStack, created initial notifications data type

* cleaned up code

* added notifications to redux

* finished sectioned list

* updated types to make more sense

* finished sectioned notifications by date

* updated notification type and tested mock backend integration

* finished read or unread logic

* minor changes

* another minor fix

* finished integration

* moved stuff

* added ability to navigate to user profile

Co-authored-by: Husam Salhab <47015061+hsalhab@users.noreply.github.com>

5 files changed, 170 insertions, 16 deletions

diff --git a/src/screens/main/Notifications.tsx b/src/screens/main/Notifications.tsx
deleted file mode 100644
index ca8c41c3..00000000
--- a/src/screens/main/Notifications.tsx
+++ /dev/null
@@ -1,13 +0,0 @@
-import React from 'react';
-import {ComingSoon} from '../../components';
-
-/**
- * Navigation Screen for displaying other users'
- * actions on the logged in user's posts
- */
-
-const Notifications: React.FC = () => {
-  return <ComingSoon />;
-};
-
-export default Notifications;
diff --git a/src/screens/main/NotificationsScreen.tsx b/src/screens/main/NotificationsScreen.tsx
new file mode 100644
index 00000000..2343215f
--- /dev/null
+++ b/src/screens/main/NotificationsScreen.tsx
@@ -0,0 +1,167 @@
+import AsyncStorage from '@react-native-community/async-storage';
+import moment from 'moment';
+import React, {useCallback, useEffect, useState} from 'react';
+import {
+  RefreshControl,
+  SectionList,
+  StyleSheet,
+  Text,
+  View,
+} from 'react-native';
+import {SafeAreaView} from 'react-native-safe-area-context';
+import {useDispatch, useSelector} from 'react-redux';
+import {Notification} from '../../components/notifications';
+import {loadUserNotifications} from '../../store/actions';
+import {RootState} from '../../store/rootReducer';
+import {NotificationType, ScreenType} from '../../types';
+import {getDateAge, SCREEN_HEIGHT} from '../../utils';
+
+const NotificationsScreen: React.FC = () => {
+  const [refreshing, setRefreshing] = useState(false);
+  // used for figuring out which ones are unread
+  const [lastViewed, setLastViewed] = useState<moment.Moment | undefined>(
+    undefined,
+  );
+  const {notifications} = useSelector(
+    (state: RootState) => state.notifications,
+  );
+  const [sectionedNotifications, setSectionedNotifications] = useState<
+    {title: 'Today' | 'Yesterday' | 'This Week'; data: NotificationType[]}[]
+  >([]);
+
+  const dispatch = useDispatch();
+
+  const onRefresh = useCallback(() => {
+    const refrestState = async () => {
+      dispatch(loadUserNotifications());
+    };
+    setRefreshing(true);
+    refrestState().then(() => {
+      setRefreshing(false);
+    });
+  }, [dispatch]);
+
+  // handles storing and fetching the "previously viewed" information
+  useEffect(() => {
+    const getAndUpdateLastViewed = async () => {
+      const key = 'notificationLastViewed';
+      const previousLastViewed = await AsyncStorage.getItem(key);
+      setLastViewed(
+        previousLastViewed == null
+          ? moment.unix(0)
+          : moment(previousLastViewed),
+      );
+      await AsyncStorage.setItem(key, moment().toString());
+    };
+    getAndUpdateLastViewed();
+  }, [notifications]);
+
+  // handles sectioning notifications to "date age"
+  // mark notifications as read or unread
+  useEffect(() => {
+    const sortedNotifications = (notifications ?? [])
+      .slice()
+      .sort((a, b) => (a.timestamp < b.timestamp ? 1 : -1));
+    let todays = [];
+    let yesterdays = [];
+    let thisWeeks = [];
+    for (const n of sortedNotifications) {
+      const notificationDate = moment(n.timestamp);
+      const dateAge = getDateAge(notificationDate);
+      if (dateAge === 'unknown') {
+        continue;
+      }
+      const unread = lastViewed ? lastViewed.diff(notificationDate) < 0 : false;
+      const newN = {...n, unread};
+      switch (dateAge) {
+        case 'today':
+          todays.push(newN);
+          continue;
+        case 'yesterday':
+          yesterdays.push(newN);
+          continue;
+        case 'thisWeek':
+          thisWeeks.push(newN);
+          continue;
+        default:
+          continue;
+      }
+    }
+    setSectionedNotifications([
+      {
+        title: 'Today',
+        data: todays,
+      },
+      {
+        title: 'Yesterday',
+        data: yesterdays,
+      },
+      {
+        title: 'This Week',
+        data: thisWeeks,
+      },
+    ]);
+  }, [lastViewed, notifications]);
+
+  const renderNotification = ({item}: {item: NotificationType}) => (
+    <Notification item={item} screenType={ScreenType.Notifications} />
+  );
+
+  const renderSectionHeader = ({section: {title}}) => (
+    <View style={styles.sectionHeaderContainer}>
+      <Text style={styles.sectionHeader}>{title}</Text>
+    </View>
+  );
+
+  return (
+    <SafeAreaView>
+      <View style={styles.header}>
+        <Text style={styles.headerText}>Notifications</Text>
+        <View style={styles.underline} />
+      </View>
+      <SectionList
+        contentContainerStyle={styles.container}
+        sections={sectionedNotifications}
+        keyExtractor={(item, index) => index.toString()}
+        renderItem={renderNotification}
+        renderSectionHeader={renderSectionHeader}
+        refreshControl={
+          <RefreshControl refreshing={refreshing} onRefresh={onRefresh} />
+        }
+      />
+    </SafeAreaView>
+  );
+};
+
+const styles = StyleSheet.create({
+  header: {
+    marginLeft: '5%',
+    marginTop: '5%',
+    alignSelf: 'flex-start',
+    flexDirection: 'column',
+  },
+  headerText: {
+    fontWeight: 'bold',
+    fontSize: 16,
+  },
+  underline: {
+    borderWidth: 2,
+    borderColor: '#8F01FF',
+  },
+  container: {
+    paddingBottom: '20%',
+    minHeight: (SCREEN_HEIGHT * 8) / 10,
+  },
+  sectionHeaderContainer: {
+    width: '100%',
+    backgroundColor: '#f3f2f2',
+  },
+  sectionHeader: {
+    marginLeft: '5%',
+    marginTop: '5%',
+    marginBottom: '2%',
+    fontSize: 16,
+  },
+});
+
+export default NotificationsScreen;
diff --git a/src/screens/main/index.ts b/src/screens/main/index.ts
index b15f76da..a5a723d7 100644
--- a/src/screens/main/index.ts
+++ b/src/screens/main/index.ts
@@ -1,3 +1,3 @@
 export {default as Home} from './Home';
-export {default as Notifications} from './Notifications';
+export {default as NotificationsScreen} from './NotificationsScreen';
 export {default as Upload} from './Upload';
diff --git a/src/screens/profile/IndividualMoment.tsx b/src/screens/profile/IndividualMoment.tsx
index 469c648e..91742324 100644
--- a/src/screens/profile/IndividualMoment.tsx
+++ b/src/screens/profile/IndividualMoment.tsx
@@ -4,7 +4,7 @@ import {StackNavigationProp} from '@react-navigation/stack';
 import React from 'react';
 import {FlatList, StyleSheet, View} from 'react-native';
 import {useSelector} from 'react-redux';
-import {ProfileStackParams} from 'src/routes/profile/ProfileStack';
+import {ProfileStackParams} from 'src/routes/main/ProfileStack';
 import {
   IndividualMomentTitleBar,
   MomentPostContent,
diff --git a/src/screens/profile/MomentCommentsScreen.tsx b/src/screens/profile/MomentCommentsScreen.tsx
index 2cc809a3..ebe4da28 100644
--- a/src/screens/profile/MomentCommentsScreen.tsx
+++ b/src/screens/profile/MomentCommentsScreen.tsx
@@ -1,6 +1,6 @@
 import * as React from 'react';
 import {RouteProp, useNavigation} from '@react-navigation/native';
-import {ProfileStackParams} from '../../routes/profile';
+import {ProfileStackParams} from '../../routes/main';
 import {CenteredView, CommentTile} from '../../components';
 import {CommentType} from '../../types';
 import {ScrollView, StyleSheet, Text, View} from 'react-native';