1 files changed, 52 insertions, 0 deletions

diff --git a/webapp/actions/post_actions.jsx b/webapp/actions/post_actions.jsx
index 866ae5888..a6b464a24 100644
--- a/webapp/actions/post_actions.jsx
+++ b/webapp/actions/post_actions.jsx
@@ -6,7 +6,9 @@ import AppDispatcher from 'dispatcher/app_dispatcher.jsx';
 import ChannelStore from 'stores/channel_store.jsx';
 import PostStore from 'stores/post_store.jsx';
 import TeamStore from 'stores/team_store.jsx';
+import UserStore from 'stores/user_store.jsx';
 
+import * as PostUtils from 'utils/post_utils.jsx';
 import Constants from 'utils/constants.jsx';
 const ActionTypes = Constants.ActionTypes;
 
@@ -62,3 +64,53 @@ export function handleNewPost(post, msg) {
         websocketMessageProps
     });
 }
+
+export function setUnreadPost(channelId, postId) {
+    let lastViewed = 0;
+    let ownNewMessage = false;
+    const post = PostStore.getPost(channelId, postId);
+    const posts = PostStore.getVisiblePosts(channelId).posts;
+    var currentUsedId = UserStore.getCurrentId();
+    if (currentUsedId === post.user_id || PostUtils.isSystemMessage(post)) {
+        for (const otherPostId in posts) {
+            if (lastViewed < posts[otherPostId].create_at && currentUsedId !== posts[otherPostId].user_id && !PostUtils.isSystemMessage(posts[otherPostId])) {
+                lastViewed = posts[otherPostId].create_at;
+            }
+        }
+        if (lastViewed === 0) {
+            lastViewed = Number.MAX_VALUE;
+        } else if (lastViewed > post.create_at) {
+            lastViewed = post.create_at - 1;
+            ownNewMessage = true;
+        } else {
+            lastViewed -= 1;
+        }
+    } else {
+        lastViewed = post.create_at - 1;
+    }
+
+    if (lastViewed === Number.MAX_VALUE) {
+        AsyncClient.updateLastViewedAt();
+        ChannelStore.resetCounts(ChannelStore.getCurrentId());
+        ChannelStore.emitChange();
+    } else {
+        let unreadPosts = 0;
+        for (const otherPostId in posts) {
+            if (posts[otherPostId].create_at > lastViewed) {
+                unreadPosts += 1;
+            }
+        }
+        const member = ChannelStore.getMember(channelId);
+        const channel = ChannelStore.get(channelId);
+        member.last_viewed_at = lastViewed;
+        member.msg_count = channel.total_msg_count - unreadPosts;
+        member.mention_count = 0;
+        ChannelStore.setChannelMember(member);
+        ChannelStore.setUnreadCount(channelId);
+        AsyncClient.setLastViewedAt(lastViewed, channelId);
+    }
+
+    if (channelId === ChannelStore.getCurrentId()) {
+        ChannelStore.emitLastViewed(lastViewed, ownNewMessage);
+    }
+}