feat: seasonal theme overlays + improved animated chat backgrounds
Adds 11 CSS-only seasonal overlays (Halloween, Christmas, New Year, Autumn, April Fool's, Lunar New Year, Valentine's Day, St. Patrick's Day, Earth Day, Deep Space, Retro Arcade) with date-based auto-detection and a manual override dropdown in Settings → Appearance → Seasonal Theme. All themes respect prefers-reduced-motion. SeasonalEffect mounts at z-index 9997 in App.tsx. Also rewrites all 5 animated chat background keyframes for smoother, more organic motion: Digital Rain gains a phosphor glow flicker; Star Drift now loops each layer by exactly its own tile size (no more seam); Grid Pulse adds an independent brightness oscillation at a prime period; Aurora Flow drives all four gradient layers through distinct paths; Fireflies adds glow-pulse and opacity-blink animations at prime periods for unsynchronised bioluminescence. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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# Lotus Chat — Implementation Reference for Backlog
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# Lotus Chat — Technical Implementation Field Guide
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**Date:** June 2026
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This document provides technical guidance, file paths, and architectural notes for unimplemented items in `LOTUS_TODO.md` to assist engineers during development.
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This document provides exhaustive, low-level implementation details for the remaining items in `LOTUS_TODO.md`. Follow these patterns to ensure code is "Lotus-perfect" (idiomatic, performant, and TDS-compliant).
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---
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## 🧵 Priority 3 — Higher Complexity
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### P3-8 · Thread Panel (Full Side Drawer)
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**Architecture:** Mirror the `MembersDrawer` pattern but with a specialized timeline.
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**⚠️ Largest Feature**
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- **Objective:** Add a right-side drawer to view and reply to threads (`m.thread` relations).
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- **Key Files to Reference:**
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- `src/app/features/room/RoomView.tsx`: Main layout. Needs to render the new `ThreadPanel` component conditionally.
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- `src/app/features/room/MembersDrawer.tsx`: Use this as a pattern for side drawers (fixed width, toggleable).
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- `src/app/features/room/message/Message.tsx`: Check `isThreadedMessage` logic and the `onReplyClick(ev, true)` handler.
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- **Architecture:**
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- Create `activeThreadEventIdAtom` in a new state file.
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- `ThreadPanel` should reuse `Timeline` components but filter for events where `m.relates_to.event_id === activeThreadEventId` and `rel_type === 'm.thread'`.
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- **SDK API:** Use `mx.getThread(eventId)` or the aggregations API: `GET /rooms/{roomId}/relations/{eventId}/m.thread`.
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- **Note:** `RoomTimeline.tsx` currently has `handleReplyClick` (Line 978) which already supports starting threads.
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---
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## 🛠️ Priority 4 — Specialized Features
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### P4-3 · Knock-to-join Notifications for Admins
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- **Objective:** Alert admins when users are knocking and provide an easy way to approve/deny.
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- **Key Files:**
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- `src/app/features/room/MembersDrawer.tsx`: Already contains logic to show "Pending Requests" (Line 412).
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- `src/app/hooks/useRoomsNotificationPreferences.ts`: Add logic to detect `Membership.Knock` events in joined rooms where the user has invite permissions.
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- **Implementation:**
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- Create a hook `usePendingKnocks(room)` that returns `room.getMembersWithMembership(Membership.Knock)`.
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- Add a notification badge to the "Members" icon in the room header if knocks > 0.
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### P4-4 · Math / LaTeX Rendering
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- **Objective:** Render `$...$` and `$$...$$` blocks using KaTeX.
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- **Key Files:**
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- `src/app/utils/sanitize.ts`: **Critical.** The sanitizer currently strips many tags. You must allow specific KaTeX/MathML outputs.
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- `src/app/plugins/react-custom-html-parser.ts`: Add a custom rule to detect LaTeX patterns in plain text or handle the specific HTML from the server.
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- `src/app/styles/CustomHtml.css.ts`: Add KaTeX CSS import/styles.
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* **1. State (src/app/state/room/thread.ts):**
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```typescript
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export const activeThreadIdAtom = atom<string | null>(null);
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```
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* **2. Layout (src/app/features/room/Room.tsx):**
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Insert the `ThreadPanel` conditionally alongside the `RoomTimeline`.
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```tsx
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{activeThreadId && (
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<>
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<Line variant="Background" direction="Vertical" size="300" />
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<ThreadPanel roomId={roomId} threadId={activeThreadId} />
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</>
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)}
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```
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* **3. Component (src/app/features/room/thread/ThreadPanel.tsx):**
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* Use `room.getThread(threadId)` from the SDK.
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* Render a `Header` with a "Close" button that sets `activeThreadIdAtom` to `null`.
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* Reuse `RoomTimeline` but pass a filtered `EventTimelineSet`.
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* **Pro Tip:** Use `thread.timelineSet` directly for the most accurate thread view.
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---
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## 🎨 Priority 5 — Gamer / Aesthetic / Customization
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### P5-1 · Custom Accent Color Picker
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### P5-1 · Custom Accent Color Picker (Non-TDS only)
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**Mechanism:** Dynamic CSS variable injection.
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- **Objective:** User-defined accent color for non-TDS themes.
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- **Key Files:**
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- `src/app/hooks/useTheme.ts`: Central theme logic.
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- `src/app/state/settings.ts`: Add `customAccentColor: string` to the settings atom.
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- **Implementation:**
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- Inject a `<style>` block into `<head>` that overrides CSS variables.
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- **Variables to target:** `--lt-accent-orange`, `--lt-accent-cyan`, `--lt-accent-green` (or their non-TDS equivalents in `folds`).
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* **1. Setting (src/app/state/settings.ts):**
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Add `customAccentColor: string` (hex).
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* **2. Manager (src/app/pages/ThemeManager.tsx):**
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Inside the `useEffect` that monitors theme changes:
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```typescript
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if (!lotusTerminal && customAccentColor) {
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document.documentElement.style.setProperty('--lt-accent-orange', customAccentColor);
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// Also derive a 'glow' version (e.g. 50% opacity)
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document.documentElement.style.setProperty('--lt-accent-orange-glow', `${customAccentColor}80`);
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}
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```
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* **3. UI (src/app/features/settings/general/General.tsx):**
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Use a `<Input type="color">` component. Hide this section if `lotusTerminal` is `true`.
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### P5-10 · Voice Channel User Limit
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### P5-14 · Animated Avatar Overlay
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**Mechanism:** CSS Pseudo-element wrapping.
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- **Objective:** Prevent joining a voice channel if the user limit is reached.
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- **Key Files:**
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- `src/app/features/call/CallView.tsx`: Join logic site.
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- **Implementation:**
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- In `CallPrescreen` (Line 77), retrieve the `io.lotus.voice_limit` state event from the room.
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- Compare `callMembers.length` with the `max_users` value from the event content.
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- If current members >= limit, disable the `canJoin` flag and display a "Channel Full" message.
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### P5-13 · Avatar Frame / Border Decorations
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- **Objective:** Add cosmetic frames around user avatars.
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- **Key Files:**
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- `src/app/components/user-avatar/UserAvatar.tsx`: Rendering site.
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- **Implementation:**
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- Add an optional `frameName` prop to the `UserAvatar` component.
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- Since `folds` components like `AvatarImage` are restrictive, wrap the entire return value (both fallback and image paths) in a new `Box` container that applies the frame/glow effects via CSS.
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### P5-21 · Custom @Mention Highlight Color
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- **Objective:** Persistent background highlight for messages that mention the user.
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- **Key Files:**
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- `src/app/components/message/layout/layout.css.ts`: Styling site.
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- `src/app/features/room/message/Message.tsx`: Logic site.
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- **Implementation:**
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- In `layout.css.ts`, add a `mention` variant to the `MessageBase` recipe that sets a static `backgroundColor`.
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- In `Message.tsx`, pass the `isMentioned` boolean (Line 800) into the `MessageBase` component as a new prop to trigger the highlight variant.
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### P5-20 · Quick Reply from Browser Notification
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- **Objective:** Inline reply in OS notifications.
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- **Key Files:**
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- `src/sw.ts`: Handle the `notificationclick` event.
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- **Implementation:**
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- Check for `event.reply` in the service worker.
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- Use the `accessToken` and `baseUrl` stored in the `sessions` map (already implemented in `sw.ts`) to send a Matrix message via `fetch` directly from the Service Worker.
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- **Crucial:** Ensure the message is sent as a relation if the notification was for a thread.
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* **1. Wrapper (src/app/components/user-avatar/UserAvatar.tsx):**
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```tsx
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const avatar = (
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<AvatarImage className={classNames(css.UserAvatar, className)} ... />
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);
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if (!frame) return avatar;
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return (
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<div className={css.AvatarFrameContainer} data-frame={frame}>
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{avatar}
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<div className={css.AvatarFrameEffect} />
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</div>
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);
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```
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* **2. CSS (src/app/components/user-avatar/UserAvatar.css.ts):**
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Define animations like `rotate` or `pulse`. Use `position: absolute; inset: -4px` on the effect div to create a glowing ring around the avatar.
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---
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## 🧪 Pending Audits Guidance
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## 🛠️ Priority 4 — Specialized Features
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### Audit-3 · Profile Banner Image
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### P4-4 · Math / LaTeX Rendering
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**Mechanism:** KaTeX injection into the HTML parser.
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- **Task:** Check if MSC4133 or Matrix v1.16 defines a banner field.
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- **Update:** Matrix spec does not currently have a stable `m.banner` field. Most clients use `org.matrix.msc4133.banner_url` (unstable).
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- **Recommendation:** Use `mx.http.authedRequest` to experiment with this field on `matrix.lotusguild.org`.
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* **1. Sanitizer (src/app/utils/sanitize.ts):**
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You must allow KaTeX-specific tags and classes (e.g., `span`, `annotation`, `math`). Use a specialized allowed list for math blocks.
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* **2. Parser (src/app/plugins/react-custom-html-parser.tsx):**
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Detect `$ ... $` and `$$ ... $$` patterns in text nodes.
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```tsx
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if (node.type === 'text') {
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const parts = node.data.split(/(\$\$.*?\$\$|\$.*?\$)/g);
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return parts.map(p => {
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if (p.startsWith('$')) return <KaTeX math={p.replace(/\$/g, '')} />;
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return p;
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});
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}
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```
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* **3. CSS (src/app/styles/CustomHtml.css.ts):**
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Import `katex/dist/katex.min.css` only when a math block is rendered to save initial bundle size.
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### P4-6 · OIDC / SSO Next-Gen Auth (MSC3861)
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**Mechanism:** Matrix Authentication Service (MAS) Integration.
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* **Architecture:** Shift from password-based `/login` to OAuth2 `authorization_code` flow.
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* **Key Files:** `src/app/pages/auth/Login.tsx` and `src/app/hooks/useAuth.ts`.
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* **Implementation:**
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1. Use `oidc-client-ts` or a similar lightweight OIDC library.
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2. Check for `m.authentication` in `/.well-known/matrix/client`.
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3. Redirect to the MAS authorization endpoint.
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4. Handle the callback in a new `OidcCallback` route and store the OIDC `refresh_token`.
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---
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## 🎨 Priority 5 — Gamer / Aesthetic / Customization
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### P5-12 · Seasonal / Event Themes
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**Mechanism:** Date-aware global overlays.
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* **1. Component (src/app/components/seasonal/SeasonalEffect.tsx):**
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```tsx
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const isHalloween = now.month === 9 && now.day >= 15; // etc.
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if (!isHalloween) return null;
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return <div className={css.HalloweenSpiderWeb} />;
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```
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* **2. Styles (src/app/styles/Animations.css.ts):**
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Use `repeating-linear-gradient` for spider webs or `keyframes` for falling snow.
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* **3. Mounting:** Place at the very end of `App.tsx` (above the `LotusToastContainer`) with `pointer-events: none`.
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### P5-13 · Avatar Frame / Border Decorations
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**Mechanism:** Static variant of P5-14.
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* **Implementation:** Use a simple `border` or `box-shadow` in `UserAvatar.tsx` based on the `io.lotus.avatar_frame` account data. Unlike the animated version, this should avoid `keyframes` to save CPU on long member lists.
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### P5-2 · Additional Color Theme Presets
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**Mechanism:** Standard vanilla-extract theme multiplication.
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* **Implementation:** Replicate the `lotusTerminalTheme` object in `src/colors.css.ts` for each new theme (Cyberpunk, Ocean, etc.). Ensure each theme defines all 50+ tokens required by the `folds` library and TDS.
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### P5-15 · In-Call Soundboard
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**Mechanism:** Local-to-Global Audio Bridge.
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* **Architecture:** Use the `Web Audio API` to mix sounds into the `MediaStream` before it enters the Element Call widget.
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* **Implementation:**
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1. Create an `AudioContext`.
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2. Create a `MediaStreamDestinationNode`.
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3. Create an `AudioBufferSourceNode` for the clip.
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4. Route the mic `MediaStream` and the clip source to the destination.
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5. Pass the destination's `.stream` to the call bridge.
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### P5-20 · Quick Reply from Browser Notification
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**Mechanism:** Service Worker `notificationclick` Action.
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* **1. Registration (src/sw.ts):**
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```typescript
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self.addEventListener('notificationclick', (event) => {
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if (event.action === 'reply' && event.reply) {
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const { roomId, threadId } = event.notification.data;
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const session = sessions.get(event.clientId); // Uses existing session mapping
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// Send via direct fetch to bypass SDK loading
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fetch(`${session.baseUrl}/_matrix/client/v3/rooms/${roomId}/send/m.room.message`, {
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method: 'POST',
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headers: { Authorization: `Bearer ${session.accessToken}` },
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body: JSON.stringify({
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msgtype: 'm.text',
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body: event.reply,
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'm.relates_to': threadId ? { rel_type: 'm.thread', event_id: threadId } : undefined
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})
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});
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}
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});
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```
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---
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## 🔬 Extreme Complexity Projects
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### P5-30 · Advanced ML Noise Suppression (Krisp-style)
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**Mechanism:** RNNoise WASM + Web Audio Worklet Pipeline.
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* **Objective:** Filter non-vocal noise from the microphone stream in real-time.
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* **Architecture:**
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1. **Engine:** Use `RNNoise` (Recurrent Neural Network for noise suppression). It is lightweight and highly effective for speech.
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2. **Pipeline:** `Mic Stream` -> `AudioWorkletNode` (Processing) -> `MediaStreamDestination` -> `Element Call`.
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* **Implementation Steps:**
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1. **WASM Wrapper:** Compile the `RNNoise` C library to WebAssembly. Use a library like `rnnoise-wasm` or `noise-suppression-js`.
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2. **Audio Worklet:** Create `src/app/utils/audio/RnnoiseWorklet.ts`. This must handle 480-sample chunks (10ms of audio at 48kHz), which is the standard frame size for RNNoise.
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3. **Client Integration:**
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* In `CallControl.ts`, intercept the `localStream`.
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* Pass the stream through the Worklet.
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* Crucially, you must ensure that the processed stream is used by the `RTCPeerConnection` within the Element Call iframe.
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### P5-31 · Granular Voice & Screenshare Quality Controls
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**Mechanism:** WebRTC Encoding Parameters + Backend Quality Guard.
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* **Objective:** Per-room and per-user control over audio fidelity and screenshare smoothness.
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* **Architecture:**
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1. **State Event:** `io.lotus.room_quality` (state key `""`) containing:
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```json
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{
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"audio_bitrate": 128000,
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"screen_max_res": "1080p",
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"screen_max_fps": 60
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}
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```
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2. **Client-Side (RoomInput / CallControl):**
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* **Screenshare:** In `src/app/plugins/call/CallControl.ts`, when initiating screenshare, map the "Quality" setting to `getDisplayMedia` constraints:
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```typescript
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const constraints = {
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video: {
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width: { ideal: 1920 }, // 1080p
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frameRate: { ideal: 60 }
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}
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};
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```
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* **Audio Bitrate:** After the call joins, find the `RTCRtpSender` for the audio track and update parameters:
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```typescript
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const sender = peerConnection.getSenders().find(s => s.track?.kind === 'audio');
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const params = sender.getParameters();
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params.encodings[0].maxBitrate = roomBitrate || 128000;
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await sender.setParameters(params);
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```
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3. **Backend Sidecar (The "Quality Guard"):**
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* **Pattern:** Extend the `voice-limit-guard.py` (on LXC 151) to handle quality metadata.
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* **Mechanism:** When a user requests a LiveKit JWT to join a room, the Guard fetches the `io.lotus.room_quality` event for that room via the Synapse Admin API.
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* **Enforcement:** The Guard injects these limits into the LiveKit token claims (if supported) or simply returns them to the client as an authorized "config" packet that the client must respect.
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* **Challenges:**
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* **LiveKit Compatibility:** Ensuring the SFU doesn't over-compress a high-bitrate stream from a "Pro" user.
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* **Network Stability:** High bitrates (512kbps audio + 60fps 1080p video) require significant upstream bandwidth. Implement a "Network Warning" UI if packets are dropped.
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### P5-34 · User-to-User Private Notes
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**Mechanism:** Encrypted account data map.
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* **Objective:** Private, cross-session notes about other users.
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* **Key Files:**
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* `src/app/hooks/useUserNotes.ts`: New hook for CRUD operations.
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* `src/app/components/user-profile/UserRoomProfile.tsx`: UI site.
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* **Implementation:**
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1. Store as a single map in `io.lotus.user_notes` account data: `{ "@alice:server": "Cool dev", "@bob:server": "Needs moderation" }`.
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2. Wrap the entire map in E2EE if the client supports local account data encryption, or rely on standard Matrix account data privacy.
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3. Add a "Notes" tab or textarea to the user profile popout.
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