Guard against undefined values in combat log undo payloads

Firestore rejects writes containing undefined values. The pause/resume
and end-combat undo snapshots read encounter fields that may not yet
exist in Firestore, so add ?? false / ?? null / ?? 0 fallbacks to
match the pattern already used in the start-combat undo path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,78 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+npm start          # Dev server at http://localhost:3000
+npm run build      # Production build
+npm test           # Run tests (no test files currently exist)
+```
+
+Docker:
+```bash
+docker build -t ttrpg-initiative-tracker .
+docker run -p 8080:80 --rm --name ttrpg-tracker-app ttrpg-initiative-tracker
+```
+
+The Dockerfile uses `NODE_OPTIONS=--openssl-legacy-provider npm run build` to work around an OpenSSL compatibility issue between Node 18 and react-scripts 5.
+
+## Architecture
+
+Single-page React app (Create React App) for DMs to manage TTRPG combat encounters with a real-time player display. The entire application — all components, hooks, Firebase init, and routing — lives in **`src/App.js`** (~2500 lines).
+
+**Key dependencies:** React 18, Firebase SDK v10 (Firestore + anonymous auth), Tailwind CSS v3, lucide-react icons.
+
+### Two App Modes (query-param routing)
+
+- Default URL → `AdminView`: full DM interface (campaign/encounter/participant management)
+- `?playerView=true` or `/display` → `DisplayView`: read-only player-facing view for a second monitor
+
+### Firebase / Firestore
+
+All app state lives in Firestore under `artifacts/{APP_ID}/public/data/`:
+- `campaigns/` — campaign documents
+- `campaigns/{id}/encounters/` — sub-collections with a `participants` array per encounter
+- `activeDisplay/status` — single doc controlling what the player display shows
+
+`APP_ID` defaults to `"ttrpg-initiative-tracker-default"` and can be overridden via `REACT_APP_TRACKER_APP_ID`.
+
+All users authenticate anonymously (Firebase Anonymous Auth). If `window.__initial_auth_token` is set, a custom token is used instead.
+
+Real-time updates use two custom hooks in App.js: `useFirestoreDocument(docPath)` and `useFirestoreCollection(collectionPath)`, both backed by `onSnapshot`.
+
+### App.js Sections (in order)
+
+1. Constants — `APP_VERSION`, `CONDITIONS` array, defaults
+2. Firebase config — reads `REACT_APP_FIREBASE_*` env vars
+3. Firestore path helpers — `getPath` object
+4. Utility functions — `generateId()`, `rollD20()`, sort helpers
+5. Custom hooks — `useFirestoreDocument`, `useFirestoreCollection`
+6. Reusable UI — `Modal`, `ConfirmationModal`, `LoadingSpinner`, `ErrorDisplay`
+7. Feature components — forms, managers, controls (see below)
+8. `AdminView` (~line 1942) — root DM component
+9. `DisplayView` (~line 2186) — root player component
+10. `App` (~line 2426) — auth + routing
+
+Major feature components: `CreateCampaignForm`, `CreateEncounterForm`, `EditParticipantModal`, `CharacterManager`, `ParticipantManager`, `InitiativeControls`, `EncounterManager`.
+
+### Styling
+
+Tailwind CSS with two custom font families configured in `tailwind.config.js`:
+- `font-cinzel` — Cinzel (serif, used for headings)
+- `font-garamond` — Alegreya Sans (default body font)
+
+### Environment Variables
+
+Copy `env.example` to `.env.local` and fill in Firebase credentials:
+
+```
+REACT_APP_FIREBASE_API_KEY
+REACT_APP_FIREBASE_AUTH_DOMAIN
+REACT_APP_FIREBASE_PROJECT_ID
+REACT_APP_FIREBASE_STORAGE_BUCKET
+REACT_APP_FIREBASE_MESSAGING_SENDER_ID
+REACT_APP_FIREBASE_APP_ID
+REACT_APP_TRACKER_APP_ID   # optional, Firestore namespace
+```

Dockerfile

@@ -38,6 +38,9 @@ LABEL stage="nginx-server"
 # Copy the build output from the 'build' stage to Nginx's html directory
 COPY --from=build /app/build /usr/share/nginx/html
 
+# Replace default nginx config with one that handles SPA client-side routing
+COPY nginx-docker.conf /etc/nginx/conf.d/default.conf
+
 # Expose port 80 (Nginx default)
 EXPOSE 80
 

LICENSE

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README.md

@@ -1,15 +1,21 @@
-# TTRPG Initiative Tracker (v0.2.1)
+# TTRPG Initiative Tracker (v0.2.5)
 
-This application is the result of not having the exact tool I want to use, and a few sessions of [vibe-coding](https://www.youtube.com/watch?v=Tw18-4U7mts) with [Google Gemini](https://developers.google.com/gemini-code-assist/docs/overview).
+![Here it is in use](images/in_use.png)
+
+This application is the result of not having the exact tool I want to use, and after a few sessions of [vibe-coding](https://www.youtube.com/watch?v=Tw18-4U7mts) with [Google Gemini](https://developers.google.com/gemini-code-assist/docs/overview), here it is!.
 
 **Use at your own risk.**
 
 A web-based application designed to help Dungeon Masters (DMs) manage and display combat initiative for tabletop role-playing games (TTRPGs). It features a DM admin interface for controlling encounters and a separate player display view suitable for an external monitor.
 
+![](images/initiative_tracker.png)
+
 Have you tried it? Got feedback or questions? Discuss here: [https://discourse.draft13.com/c/ttrpg-initiative-tracker/16](https://discourse.draft13.com/c/ttrpg-initiative-tracker/16)
 
 ## Features
 
+![DM View.](images/dm_view.png)
+
 * **Campaign Management:**
     * Create campaigns to organize game sessions.
     * Option to set a custom background image URL for the player display on a per-campaign basis.
@@ -17,6 +23,7 @@ Have you tried it? Got feedback or questions? Discuss here: [https://discourse.d
 * **Character Management:**
     * Add and manage characters (player characters) within each campaign.
     * Set default Max HP and default Initiative Modifier for each campaign character.
+    * The character list is collapsible to save screen space.
 * **Encounter Management:**
     * Create multiple encounters per campaign.
     * Add characters from the campaign roster (with auto-rolled initiative based on their modifier and HP pre-filled from campaign defaults) or add custom monsters.
@@ -24,16 +31,38 @@ Have you tried it? Got feedback or questions? Discuss here: [https://discourse.d
     * "Add All Campaign Characters" button for quickly populating encounters with initiative rolls.
     * DM controls to start, pause/resume, advance turns, and end encounters.
     * Visual feedback for rolled initiative when adding individual participants.
+    * Participants can be added mid-combat while the encounter is paused; the turn order recalculates on resume.
+* **HP Tracking:**
+    * Apply damage or healing to any participant during combat directly from the DM view.
+    * When a participant reaches 0 HP they are automatically marked inactive and shown with a skull (☠️) icon.
+    * Healing a dead participant above 0 HP revives them and reactivates them in the turn order.
+* **Death Save Tracking:**
+    * When a player character reaches 0 HP, three death save checkboxes appear in the DM view.
+    * Marking the third death save triggers a dissolve animation on the player display, then removes the participant from the encounter.
+* **Conditions:**
+    * Apply any of 22 conditions to a participant, including all standard D&D conditions plus several extras: Alchemist Fire 🔥, Bardic Inspiration 🎵, Blinded 🙈, Charmed 💘, Deafened 🔇, Exhaustion 😴, Frightened 😱, Grappled 🤜, Grazed 🩹, Incapacitated 💫, Invisible 👻, Paralyzed ⚡, Petrified 🗿, Poisoned 🤢, Prone ⬇️, Restrained 🕸️, Sapped 🔨, Shield 🛡️, Slowed 🐌, Stunned 💥, Unconscious 💤, Vexed 🎯.
+    * Active conditions are shown as emoji badges on both the DM view and the player display.
+    * Conditions can be toggled directly from the badge or from an expandable condition picker per participant.
 * **Player Display:**
-    * A clean interface showing the current initiative order, participant HP (monster HP totals are hidden, only the bar is shown), and current turn.
-    * NPCs (monster-type) are visually distinct from hostile monsters.
-    * Displays custom campaign background if set.
-    * Shows a "Game Session Paused" message when no encounter is active or if the current encounter is paused by the DM.
-    * Player display is opened in a separate window via a button in the DM's header.
+    * A clean interface showing the current initiative order, round number, participant HP, and current turn.
+    * HP bars use color-coded thresholds: green (above half), yellow (quarter to half), red (below quarter), dark red (dead).
+    * Monster and NPC HP totals are hidden; only the color-coded bar is shown.
+    * Player character HP can be hidden from the player display via a toggle in the DM's initiative controls ("Hide player HP"). When enabled, only the color-coded bar is shown for characters as well.
+    * Active conditions are displayed as emoji badges on each participant's card.
+    * Inactive participants (and dead ones) are greyed out with a grayscale filter.
+    * Inactive monsters (e.g. pre-staged or summoned reserves) are hidden from the player display entirely; inactive player characters still appear greyed out.
+    * The current participant's card auto-scrolls into view when the turn advances.
+    * NPCs are visually distinct from hostile monsters, which are distinct from player characters.
+    * Displays a custom campaign background image if one is set.
+    * Shows a "Game Session Paused" message when no encounter is active, or "(Combat Paused)" when the DM pauses a running encounter.
+    * Player display is opened in a separate window via the "Open Player Window" button in the DM's header.
+    * A **fullscreen button** (top-right corner) toggles the browser into fullscreen mode — ideal for a dedicated second monitor.
+    * A **prevent sleep toggle** (moon/coffee icon, top-right corner) uses the browser Wake Lock API to keep the screen on while active.
+* **Combat Action Log:** A running log of combat events (HP changes, condition changes, turn advances, participant additions/removals, encounter starts/ends, etc.) is available at `/logs`. Entries are timestamped and tagged with the encounter name. Most entries include an **↩ Undo** button that rolls back the action in Firestore (restoring HP, conditions, turn order, etc.). Rolled-back entries are greyed out with a strikethrough. The log can be cleared in bulk from that page.
 * **Real-time Updates:** Uses Firebase Firestore for real-time synchronization between DM actions and the player display.
 * **Initiative Tie-Breaking:** DMs can drag-and-drop participants with tied initiative scores (before an encounter starts or while paused) to set a manual order.
 * **Responsive Design:** Styled with Tailwind CSS.
-* **Confirmation Modals:** Implemented for destructive actions like deleting campaigns, characters, encounters, or ending combat.
+* **Confirmation Modals:** Used for destructive actions like deleting campaigns, characters, encounters, or ending combat.
 
 ## Tech Stack
 
@@ -44,8 +73,7 @@ Have you tried it? Got feedback or questions? Discuss here: [https://discourse.d
 
 ## App Usage Overview
 
-![DM View Screenshot Placeholder](images/dm_view.png) 
-*(Replace with an actual screenshot of your DM view)*
+![](images/running_combat.png) 
 
 The TTRPG Initiative Tracker is designed for Dungeon Masters to manage combat encounters and display the initiative order to players. Here's a typical workflow:
 
@@ -65,16 +93,33 @@ The TTRPG Initiative Tracker is designed for Dungeon Masters to manage combat en
         * Once participants are added and initiative is set, click "Start Encounter". This also automatically makes the encounter live on the Player Display.
         * Use the "Pause" button to temporarily halt combat. While paused, you can adjust HP and re-order tied initiatives. Click "Resume" to continue.
         * Use the "Next Turn" button (disabled when paused) to advance through the initiative order. The current combatant will be highlighted.
-        * Apply damage or healing to participants directly in the Admin View.
-        * Mark participants as inactive (e.g., if knocked out) using the toggle next to their name.
+        * Apply damage or healing to participants directly in the Admin View. Participants at 0 HP are automatically deactivated and marked with a skull icon. Healing them above 0 HP revives them.
+        * For player characters at 0 HP, track death saving throws using the three checkboxes that appear. Marking the third failure triggers a death animation on the player display and removes the participant.
+        * Apply or remove conditions (Blinded, Charmed, Poisoned, etc.) using the ✨ button next to each participant. Active conditions appear as emoji badges on both the DM view and the player display.
+        * Mark participants as inactive (e.g., if knocked out) using the toggle next to their name. Inactive monsters are hidden from the player display entirely, making this useful for pre-staging summoned reserves.
+        * Toggle **Hide player HP** in the initiative controls to show or hide player character HP values on the player display.
         * Click "End Encounter" (with confirmation) when combat is over. This also deactivates it from the Player Display.
 
 2.  **Player Display Window:**
-    * This window (opened by the DM via `/?playerView=true` URL) shows a simplified, header-less view of the active encounter.
-    * It displays the initiative order, current turn, round number, and participant HP (monster/NPC HP values are hidden, only the bar is shown).
-    * NPCs are styled with a muted gray background, distinct from hostile monsters (custom reddish-brown) and player characters (blueish).
-    * If a custom background URL was set for the campaign, it will be displayed.
-    * If no encounter is active on the Player Display, or if the current encounter is paused by the DM, it will show an appropriate message ("Game Session Paused" or "Combat Paused").
+    * This window (opened by the DM via the "Open Player Window" button, or accessed directly at `/display` or `/?playerView=true`) shows a simplified, header-less view of the active encounter.
+    * It displays the initiative order, current turn, round number, and participant HP bars. Monster/NPC HP totals are hidden; only the color-coded bar is shown. Player character HP is shown numerically unless the DM has enabled "Hide player HP".
+    * HP bars are color-coded: green (above 50%), yellow (25–50%), red (below 25%), dark red (dead/0 HP).
+    * Active conditions are shown as emoji badges on each participant's card.
+    * The current participant's card automatically scrolls into view when the turn advances.
+    * NPCs are styled with a muted gray background, distinct from hostile monsters (reddish-brown) and player characters (dark blue/indigo).
+    * Dead and inactive participants are greyed out with a grayscale filter. Inactive monsters are hidden entirely.
+    * When a player character's third death save is marked, a dissolve animation plays on the display before the participant is removed.
+    * If a custom background URL was set for the campaign, it will be displayed with a semi-transparent overlay behind the participant cards.
+    * If no encounter is active on the Player Display, it shows "Game Session Paused". If the current encounter is paused by the DM, it shows "(Combat Paused)".
+    * Use the **fullscreen button** (top-right) to go fullscreen — great for a dedicated second monitor. Press Escape or click again to exit.
+    * Use the **prevent sleep toggle** (moon icon, top-right) to keep the screen awake using the browser Wake Lock API. The icon turns amber and switches to a coffee cup when active.
+
+3.  **Combat Log (`/logs`):**
+    * A dedicated page that records all significant combat events: encounter starts and ends, turn advances, HP changes, condition changes, participant additions/removals, and activation toggles.
+    * Each entry is timestamped and tagged with the encounter name for easy reference.
+    * Most entries have an **↩ Undo** button. Clicking it rolls back that specific action in Firestore — restoring HP, conditions, turn order, or participant state to what it was before. The entry is then greyed out and marked "rolled back".
+    * The log can be cleared in bulk from the page (with confirmation).
+    * Accessible via the "Logs" link in the DM header or directly at `/logs`.
 
 This flow allows the DM to prepare and run encounters efficiently while providing a clear, real-time view for the players.
 
@@ -92,7 +137,7 @@ This flow allows the DM to prepare and run encounters efficiently while providin
 
 1.  **Clone the Repository:**
     ```bash
-    git clone <your-repository-url>
+    git clone https://code.draft13.com/robert/ttrpg-initiative-tracker
     cd ttrpg-initiative-tracker
     ```
 
@@ -183,7 +228,6 @@ This project includes a `Dockerfile` to containerize the application for deploym
 ## Project Structure
 
 <pre>
-
 ttrpg-initiative-tracker/
 ├── .dockerignore        # Specifies intentionally untracked files that Docker should ignore
 ├── .env.example         # Example environment variables
@@ -202,7 +246,6 @@ ttrpg-initiative-tracker/
 ├── App.js           # Main application component
 ├── index.css        # Global styles (including Tailwind directives)
 └── index.js         # React entry point
-
 </pre>
 
 ## Contributing

nginx-docker.conf

@@ -0,0 +1,9 @@
+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

public/index.html

@@ -10,6 +10,9 @@
     />
     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700;900&family=Alegreya+Sans:ital,wght@0,400;0,500;0,700;1,400&display=swap" rel="stylesheet">
     <title>TTRPG Initiative Tracker</title>
   </head>
   <body>

src/index.css

@@ -7,14 +7,9 @@
 
 body {
   margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
+  font-family: 'Alegreya Sans', system-ui, sans-serif;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
-  /* background-color: #1A202C; /* Tailwind Slate 900 */
-  /* color: #E2E8F0;       /* Tailwind Slate 200 */
-  /* These will likely be overridden by the App component's Tailwind classes */
 }
 
 code {

tailwind.config.js

@@ -6,7 +6,12 @@ module.exports = {
     "./public/index.html"
   ],
   theme: {
-    extend: {},
+    extend: {
+      fontFamily: {
+        cinzel: ['Cinzel', 'serif'],
+        garamond: ['"Alegreya Sans"', 'system-ui', 'sans-serif'],
+      },
+    },
   },
   plugins: [],
 }