Chat App - Activity Indicators

Create a real-time chat app.

See language/*.md for language-specific setup, architecture, and constraints.

UI Requirements

Use SpacetimeDB brand styling (dark theme).

Features

Basic Chat Features

• Users can set a display name
• Users can create chat rooms and join/leave them
• Users can send messages to rooms they've joined
• Show who's online
• Include reasonable validation (e.g., don't let users spam, enforce sensible limits)

Typing Indicators

• Show when other users are currently typing in a room
• Typing indicator should automatically expire after a few seconds of inactivity
• Display "User is typing..." or "Multiple users are typing..." in the UI

Read Receipts

• Track which users have seen which messages
• Display "Seen by X, Y, Z" under messages (or a seen indicator)
• Update read status in real-time as users view messages

Unread Message Counts

• Show unread message count badges on the room list
• Track last-read position per user per room
• Update counts in real-time as new messages arrive or are read

Scheduled Messages

• Users can compose a message and schedule it to send at a future time
• Show pending scheduled messages to the author (with option to cancel)
• Message appears in the room at the scheduled time

Ephemeral/Disappearing Messages

• Users can send messages that auto-delete after a set duration (e.g., 1 minute, 5 minutes)
• Show a countdown or indicator that the message will disappear
• Message is permanently deleted from the database when time expires

Message Reactions

• Users can react to messages with emoji (e.g., 👍 ❤️ 😂 😮 😢)
• Show reaction counts on messages that update in real-time
• Users can toggle their own reactions on/off
• Display who reacted when hovering over reaction counts

Message Editing with History

• Users can edit their own messages after sending
• Show "(edited)" indicator on edited messages
• Other users can view the edit history of a message
• Edits sync in real-time to all viewers

Real-Time Permissions

• Room creators are admins and can kick/ban users from their rooms
• Kicked users immediately lose access and stop receiving room updates
• Admins can promote other users to admin
• Permission changes apply instantly without requiring reconnection

Rich User Presence

• Users can set their status: online, away, do-not-disturb, invisible
• Show "Last active X minutes ago" for users who aren't online
• Status changes sync to all viewers in real-time
• Auto-set to "away" after period of inactivity

Message Threading

• Users can reply to specific messages, creating a thread
• Show reply count and preview on parent messages
• Threaded view to see all replies to a message
• New replies sync in real-time to thread viewers

Private Rooms and Direct Messages

• Users can create private/invite-only rooms that don't appear in the public room list
• Room creators can invite specific users by username
• Direct messages (DMs) between two users as a special type of private room
• Invited users receive notifications and can accept/decline invitations
• Only members can see private room content and member lists

Room Activity Indicators

• Show activity badges on rooms with recent message activity (e.g., "Active now", "Hot")
• Display real-time message velocity or activity level per room
• Activity indicators update live as conversation pace changes
• Help users quickly identify where active conversations are happening