update readme

Responsive single-column layout (max 480px) with styles for:
- Option items with label/vote-button rows
- Voted state highlighting (green tint)
- Active/closed timer color states
- Disabled button opacity
- Full-width copy URL button

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

.gitignore

@@ -0,0 +1 @@
+node_modules/

README.md

@@ -1,14 +1,55 @@
 # P2P Poll App
 
-P2P Poll - Minimal GUN-based Scaffolding
+A peer-to-peer polling app built with [Automerge](https://automerge.org/) and Vanilla JS. No backend required — polls sync in real time across browsers using CRDTs and a WebSocket relay.
 
-What this is
-- A tiny peer-to-peer polling app implemented with vanilla JS and GUN (a decentralized, CRDT-friendly database).
-- No central server for poll data. Peers connect and synchronize the poll in real-time.
+## Features
 
-Notes
-- This scaffold uses GUN’s browser-based peer-to-peer data replication.
-- You can extend with:
-  - Persistent storage on each peer
-  - Better conflict resolution UI
-  - Optional signaling server for explicit peer discovery
+- **Add options** — type an option and press Enter or click "Add Option". Duplicate options (case-insensitive) are rejected with an inline error message.
+- **Vote on options** — click the vote button next to any option. You can vote on multiple options, but only once per option.
+- **Toggle votes** — click your vote again to remove it (the button turns green with a checkmark when you've voted).
+- **Live vote counts** — options are sorted by vote count in descending order and update in real time as votes come in from other users.
+- **2-minute countdown timer** — click "Start 2-min Vote" to begin a shared countdown. Voting is open before and during the countdown. Once the timer expires, all vote buttons are disabled.
+- **Shared timer** — the deadline is stored in the Automerge document, so all peers see the same countdown and voting closes simultaneously for everyone.
+- **Copy URL** — click "Copy URL" to copy the poll link to your clipboard. Share it with others to join the same poll.
+- **P2P sync** — all state (options, votes, timer) syncs across browsers in real time with no central server handling your data.
+
+## How it works
+
+### Tech stack
+
+- **[Automerge](https://automerge.org/)** via `@automerge/vanillajs` — a CRDT library that lets multiple clients concurrently edit shared documents and merge changes without conflicts.
+- **BroadcastChannelNetworkAdapter** — syncs between tabs in the same browser instantly via the browser's BroadcastChannel API.
+- **WebSocketClientAdapter** — syncs across different browsers/devices via a WebSocket relay (`wss://sync.automerge.org`). The relay only forwards CRDT messages; it does not store or interpret your data.
+- **IndexedDBStorageAdapter** — persists the document locally so it survives page refreshes.
+- **Vite** — bundles the app with WebAssembly support (required by Automerge).
+
+### Data model
+
+The poll is a single Automerge document with three fields:
+
+```js
+{
+  options: string[],       // list of poll options in insertion order
+  votes: { [option]: number }, // vote count per option
+  deadline: number | null  // Unix timestamp (ms) when voting closes, or null
+}
+```
+
+### URL-based sharing
+
+Each document gets a unique Automerge URL (e.g. `automerge:abc123...`) stored in the page's URL hash. Opening the same URL in any browser loads and syncs the same document. Creating a new poll generates a new document and updates the hash automatically.
+
+### Voting rules
+
+- Voted options are tracked in `localStorage` (keyed by document URL), so they persist across page refreshes but are isolated per browser.
+- One vote per option per user. Votes can be toggled off and back on until the timer expires.
+- The timer (`doc.deadline`) is set once by whoever clicks "Start 2-min Vote" and is shared via the Automerge document, so all peers use the same deadline.
+
+## Running locally
+
+```bash
+pnpm install
+pnpm dev
+```
+
+Open the printed localhost URL. To test cross-browser sync, copy the URL (including the `#automerge:...` hash) and open it in a different browser.

app.js

@@ -1,200 +1,214 @@
-// Minimal GUN-based P2P Poll scaffold (vanilla JS)
+import {
+  Repo,
+  BroadcastChannelNetworkAdapter,
+  WebSocketClientAdapter,
+  IndexedDBStorageAdapter,
+  isValidAutomergeUrl,
+} from "@automerge/vanillajs";
 
-(function() {
-  // Initialize GUN (no server needed; can optionally connect to a relay server)
-  // If you want a local-only node for prototyping: Gun()
-  // If you want to use a signaling server for discovery, pass a list of peers to Gun().opt({peers: [...]})
-  const gun = Gun();
+const REPO = new Repo({
+  network: [
+    new BroadcastChannelNetworkAdapter(),
+    new WebSocketClientAdapter("wss://sync.automerge.org"),
+  ],
+  storage: new IndexedDBStorageAdapter(),
+});
 
-  // DOM helpers
-  const pollSection = document.getElementById('poll');
-  const pollIdInput = document.getElementById('pollId');
-  const loadPollBtn = document.getElementById('loadPollBtn');
-  const createPollBtn = document.getElementById('createPollBtn');
-  const pollTitleInput = document.getElementById('pollTitle');
-  const setTitleBtn = document.getElementById('setTitleBtn');
-  const optionsDiv = document.getElementById('options');
-  const newOptionInput = document.getElementById('newOption');
-  const addOptionBtn = document.getElementById('addOptionBtn');
-  const totalVotesSpan = document.getElementById('totalVotes');
-  const pollIdDisplay = document.getElementById('pollIdDisplay');
+let HANDLE;
 
-  let currentPollId = null;
-  let pollsRef = null; // Gun node for /polls/{pollId}
-  let pollData = null; // local cache
+function getVotedKey(docUrl) {
+  return `p2p-poll-voted:${docUrl}`;
+}
 
-  // Helpers
-  function renderOptionList(options) {
-    optionsDiv.innerHTML = '';
-    const keys = Object.keys(options || {});
-    if (keys.length === 0) {
-      optionsDiv.innerHTML = '<p>No options yet. Add one below.</p>';
-      return;
-    }
-    keys.forEach((optId) => {
-      const opt = options[optId];
-      const el = document.createElement('div');
-      el.className = 'option';
-      el.innerHTML = `
-        <span class="text">${opt.text}</span>
-        <button data-optid="${optId}" class="voteBtn">Vote (${opt.votes || 0})</button>
-      `;
-      optionsDiv.appendChild(el);
-    });
-  }
+function getVotedOptions() {
+  const key = getVotedKey(document.location.hash);
+  return new Set(JSON.parse(localStorage.getItem(key) || "[]"));
+}
 
-  function updateTotalVotes() {
-    const opts = pollData && pollData.options ? pollData.options : {};
-    const total = Object.values(opts).reduce((sum, o) => sum + (o.votes || 0), 0);
-    totalVotesSpan.textContent = total;
-  }
+function markVoted(opt) {
+  const key = getVotedKey(document.location.hash);
+  const voted = getVotedOptions();
+  voted.add(opt);
+  localStorage.setItem(key, JSON.stringify([...voted]));
+}
 
-  // Load existing poll and subscribe to changes
-  function loadPoll(pollId) {
-    if (!pollId) return;
+function unmarkVoted(opt) {
+  const key = getVotedKey(document.location.hash);
+  const voted = getVotedOptions();
+  voted.delete(opt);
+  localStorage.setItem(key, JSON.stringify([...voted]));
+}
 
-    currentPollId = pollId;
-    pollIdDisplay.textContent = pollId;
-    pollsRef = gun.get('polls').get(pollId);
+const locationHash = document.location.hash.substring(1);
+const statusEl = document.getElementById("status");
+const optionsList = document.getElementById("options-list");
+const optionInput = document.getElementById("option-input");
+const addBtn = document.getElementById("add-btn");
+const duplicateMsg = document.getElementById("duplicate-msg");
+const copyBtn = document.getElementById("copy-btn");
+const timerEl = document.getElementById("timer");
+const startVotingBtn = document.getElementById("start-voting-btn");
 
-    // Initialize structure if new poll
-    pollsRef.get('title').put('Untitled Poll');
-    pollsRef.get('options').put({}); // ensure map exists
-
-    // Real-time updates: listen to changes
-    pollsRef.get('title').on((title) => {
-      pollTitleInput.value = title || '';
-    });
-
-    pollsRef.on((data) => {
-      // data is the entire poll node if subscribed; but we explore explicit fields
-    });
-
-    // For options map
-    pollsRef.get('options').on((opts) => {
-      // opts is the entire options map; convert to plain object
-      const optionsObj = toPlainObject(opts);
-      pollData = {
-        title: null,
-        options: optionsObj
-      };
-      renderOptionList(optionsObj);
-      updateTotalVotes();
-    });
-
-    // Also listen for title changes separately (in case some clients push via title path)
-    pollsRef.get('title').on((title) => {
-      pollTitleInput.value = title || '';
-    });
-
-    // Show UI
-    document.getElementById('setup').style.display = 'none';
-    pollSection.style.display = 'block';
-  }
-
-  // Create a new poll
-  function createPoll() {
-    const pollId = pollIdInput.value.trim();
-    if (!pollId) {
-      alert('Please enter a poll ID to create.');
-      return;
-    }
-    currentPollId = pollId;
-    // Initialize poll
-    pollsRef = gun.get('polls').get(pollId);
-    pollsRef.put({
-      title: 'New Poll',
-    });
-    pollsRef.get('options').put({}); // ensure map exists
-    // reflect in UI
-    pollIdDisplay.textContent = pollId;
-    pollTitleInput.value = 'New Poll';
-    pollSection.style.display = 'block';
-    document.getElementById('setup').style.display = 'none';
-  }
-
-  // Add option
-  function addOption() {
-    if (!pollsRef) {
-      alert('Load or create a poll first.');
-      return;
-    }
-    const text = newOptionInput.value.trim();
-    if (!text) return;
-    const optionId = 'opt_' + Date.now();
-    pollsRef.get('options').get(optionId).put({ text, votes: 0 });
-    newOptionInput.value = '';
-  }
-
-  // Set title
-  function setTitle() {
-    if (!pollsRef) return;
-    const title = pollTitleInput.value.trim() || 'Untitled';
-    pollsRef.get('title').put(title);
-  }
-
-  // Vote handler (delegated)
-  function handleVoteClick(e) {
-    if (e.target.classList.contains('voteBtn')) {
-      const optId = e.target.getAttribute('data-optid');
-      if (!optId || !pollsRef) return;
-      const optRef = pollsRef.get('options').get(optId);
-      // Increment votes locally
-      optRef.get('votes').once((v) => {
-        const current = v || 0;
-        optRef.put({ votes: current + 1 });
-      });
-      // UI will update via the on() listener on options map
-    }
-  }
-
-  // Utilities
-  function toPlainObject(obj) {
-    // Gun emits special proxy-like objects; convert to plain object
-    if (!obj) return {};
-    // If it's already a plain object, return
-    if (typeof obj !== 'object') return {};
-    // Gun events deliver object-like; attempt shallow copy
+if (isValidAutomergeUrl(locationHash)) {
+  statusEl.textContent = "Loading document…";
   try {
-      const copy = JSON.parse(JSON.stringify(obj));
-      return copy;
-    } catch (e) {
-      // Fallback: return as-is if cannot stringify
-      return obj;
-    }
+    HANDLE = await REPO.find(locationHash);
+    statusEl.textContent = "";
+  } catch (err) {
+    statusEl.textContent = "Could not load document. Starting a new one.";
+    HANDLE = REPO.create({ options: [], votes: {}, deadline: null });
+    document.location.hash = HANDLE.url;
   }
+} else {
+  HANDLE = REPO.create({ options: [], votes: {}, deadline: null });
+  document.location.hash = HANDLE.url;
+}
 
-  // Event bindings
-  loadPollBtn.addEventListener('click', () => {
-    const id = pollIdInput.value.trim();
-    if (!id) {
-      alert('Enter a Poll ID to load.');
+HANDLE.on("change", ({ doc }) => render(doc));
+
+const initialDoc = HANDLE.doc();
+if (initialDoc) render(initialDoc);
+
+let timerInterval = null;
+
+function render(doc) {
+  renderOptions(doc);
+  renderTimer(doc);
+}
+
+function renderOptions(doc) {
+  const votes = doc.votes || {};
+  const deadline = doc.deadline ?? null;
+  const now = Date.now();
+  const votingClosed = deadline !== null && now >= deadline;
+  const votedOptions = getVotedOptions();
+
+  const sorted = [...(doc.options || [])].sort(
+    (a, b) => (votes[b] || 0) - (votes[a] || 0),
+  );
+
+  optionsList.innerHTML = "";
+  sorted.forEach((opt) => {
+    const count = votes[opt] || 0;
+    const alreadyVoted = votedOptions.has(opt);
+
+    const item = document.createElement("div");
+    item.className = "option-item";
+
+    const label = document.createElement("span");
+    label.className = "option-label";
+    label.textContent = opt;
+
+    const voteBtn = document.createElement("button");
+    voteBtn.className = alreadyVoted ? "vote-btn voted" : "vote-btn";
+    voteBtn.textContent = alreadyVoted ? `✓ ${count}` : `▲ ${count}`;
+    voteBtn.disabled = votingClosed;
+    if (votingClosed) voteBtn.title = "Voting is closed";
+    else if (alreadyVoted) voteBtn.title = "Click to remove your vote";
+
+    voteBtn.addEventListener("click", () => {
+      if (alreadyVoted) {
+        unmarkVoted(opt);
+        HANDLE.change((d) => {
+          if (!d.votes) d.votes = {};
+          d.votes[opt] = Math.max(0, (d.votes[opt] || 0) - 1);
+        });
+      } else {
+        markVoted(opt);
+        HANDLE.change((d) => {
+          if (!d.votes) d.votes = {};
+          d.votes[opt] = (d.votes[opt] || 0) + 1;
+        });
+      }
+    });
+
+    item.appendChild(label);
+    item.appendChild(voteBtn);
+    optionsList.appendChild(item);
+  });
+}
+
+function renderTimer(doc) {
+  const deadline = doc?.deadline ?? null;
+  const now = Date.now();
+
+  if (deadline === null) {
+    timerEl.textContent = "";
+    startVotingBtn.hidden = false;
     return;
   }
-    loadPoll(id);
-  });
 
-  createPollBtn.addEventListener('click', () => {
-    createPoll();
-  });
+  startVotingBtn.hidden = true;
 
-  addOptionBtn.addEventListener('click', addOption);
-  newOptionInput.addEventListener('keydown', (ev) => {
-    if (ev.key === 'Enter') addOption();
-  });
-
-  setTitleBtn.addEventListener('click', setTitle);
-
-  // Delegate vote clicks
-  optionsDiv.addEventListener('click', handleVoteClick);
-
-  // Initialize: optionally auto-create a poll if URL param present
-  // Example: ?pollId=my-poll-123
-  const urlParams = new URLSearchParams(window.location.search);
-  const autoPoll = urlParams.get('pollId');
-  if (autoPoll) {
-    pollIdInput.value = autoPoll;
-    loadPoll(autoPoll);
+  if (now >= deadline) {
+    timerEl.textContent = "Voting closed.";
+    timerEl.className = "timer closed";
+    clearInterval(timerInterval);
+    timerInterval = null;
+    return;
   }
 
-})();
+  const remaining = Math.ceil((deadline - now) / 1000);
+  const mins = Math.floor(remaining / 60);
+  const secs = remaining % 60;
+  timerEl.textContent = `Voting closes in ${mins}:${secs.toString().padStart(2, "0")}`;
+  timerEl.className = "timer active";
+
+  if (!timerInterval) {
+    timerInterval = setInterval(() => {
+      const d = HANDLE.doc();
+      if (!d) return;
+      renderTimer(d);
+      renderOptions(d);
+      if (Date.now() >= d.deadline) {
+        clearInterval(timerInterval);
+        timerInterval = null;
+      }
+    }, 1000);
+  }
+}
+
+startVotingBtn.addEventListener("click", () => {
+  HANDLE.change((d) => {
+    d.deadline = Date.now() + 2 * 60 * 1000;
+  });
+});
+
+addBtn.addEventListener("click", () => {
+  const value = optionInput.value.trim();
+  if (!value) return;
+
+  const doc = HANDLE.doc();
+  const valueLower = value.toLowerCase();
+  const isDuplicate = (doc?.options || []).some(
+    (opt) => opt.toLowerCase() === valueLower,
+  );
+
+  if (isDuplicate) {
+    duplicateMsg.textContent = `"${value}" is already in the list.`;
+    duplicateMsg.hidden = false;
+    return;
+  }
+
+  duplicateMsg.hidden = true;
+  HANDLE.change((d) => {
+    if (!d.options) d.options = [];
+    d.options.push(value);
+  });
+  optionInput.value = "";
+});
+
+optionInput.addEventListener("keydown", (e) => {
+  if (e.key === "Enter") addBtn.click();
+});
+
+optionInput.addEventListener("input", () => {
+  duplicateMsg.hidden = true;
+});
+
+copyBtn.addEventListener("click", () => {
+  navigator.clipboard.writeText(window.location.href).then(() => {
+    copyBtn.textContent = "Copied!";
+    setTimeout(() => (copyBtn.textContent = "Copy URL"), 1500);
+  });
+});

index.html

@@ -1,55 +1,31 @@
 <!doctype html>
 <html lang="en">
-<head>
+    <head>
         <meta charset="UTF-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
-  <title>P2P Poll</title>
-  <link rel="stylesheet" href="styles.css" />
-  <!-- Gun.js via CDN for quick start -->
-  <script src="https://unpkg.com/gun/gun.js"></script>
-</head>
-<body>
-  <div class="container">
-    <h1>P2P Poll</h1>
-
-    <section id="setup" class="card">
-      <h2>Start or Join Poll</h2>
-      <div class="field">
-        <label for="pollId">Poll ID (share with peer):</label>
-        <input id="pollId" type="text" placeholder="e.g. my-poll-123" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>P2P Polling App</title>
+        <link rel="stylesheet" href="./styles.css" />
+    </head>
+    <body>
+        <div id="app">
+            <h1>P2P Polling App</h1>
+            <div id="status"></div>
+            <div id="add-option">
+                <input
+                    type="text"
+                    id="option-input"
+                    placeholder="Enter an option..."
+                />
+                <button id="add-btn">Add Option</button>
             </div>
-      <button id="loadPollBtn">Load Poll</button>
-      <button id="createPollBtn">Create New Poll</button>
-      <p class="note">Tip: You can run two instances and connect by using the same Poll ID.</p>
-    </section>
-
-    <section id="poll" class="card" style="display:none;">
-      <h2>Poll</h2>
-      <div class="field">
-        <label for="pollTitle">Poll Title</label>
-        <input id="pollTitle" type="text" placeholder="Poll Title" />
-        <button id="setTitleBtn">Set Title</button>
+            <div id="duplicate-msg" hidden></div>
+            <div id="timer-section">
+                <div id="timer"></div>
+                <button id="start-voting-btn">Start 2-min Vote</button>
             </div>
-
-      <div id="options" class="options">
-        <!-- dynamic options will render here -->
+            <div id="options-list"></div>
+            <button id="copy-btn">Copy URL</button>
         </div>
-
-      <div class="field">
-        <input id="newOption" type="text" placeholder="Add a new option" />
-        <button id="addOptionBtn">Add Option</button>
-      </div>
-
-      <div class="summary">
-        <p>Total votes: <span id="totalVotes">0</span></p>
-      </div>
-
-      <div class="share">
-        <p>Share Poll ID with peer: <code id="pollIdDisplay"></code></p>
-      </div>
-    </section>
-  </div>
-
-  <script src="app.js"></script>
-</body>
+        <script type="module" src="./app.js"></script>
+    </body>
 </html>

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "p2p-poll-app",
+  "type": "module",
+  "engines": {
+    "node": ">=24"
+  },
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@automerge/automerge-repo": "^2.0.0",
+    "@automerge/automerge-repo-network-websocket": "^2.0.0",
+    "@automerge/automerge-repo-storage-indexeddb": "^2.0.0",
+    "@automerge/vanillajs": "^2.5.3"
+  },
+  "devDependencies": {
+    "vite": "^6.0.0",
+    "vite-plugin-top-level-await": "^1.4.0",
+    "vite-plugin-wasm": "^3.3.0"
+  }
+}

styles.css

@@ -1,104 +1,93 @@
-:root {
-    --bg: #0f1220;
-    --card: #1a1740;
-    --text: #e8e3ff;
-    --muted: #b8a7d2;
-    --accent: #6bd3ff;
-}
-
-* {
-    box-sizing: border-box;
-}
-
-html,
 body {
-    margin: 0;
-    padding: 0;
     font-family: sans-serif;
-    background: #0b0a14;
-    color: #fff;
-    height: 100%;
-}
-
-.container {
-    max-width: 700px;
+    max-width: 480px;
     margin: 40px auto;
     padding: 0 16px;
 }
 
-.card {
-    background: #1f1740;
-    border-radius: 12px;
-    padding: 16px;
-    margin-bottom: 14px;
-    border: 1px solid #2a1950;
-}
-
-.field {
-    margin-bottom: 12px;
+#add-option {
     display: flex;
     gap: 8px;
-    align-items: center;
+    margin-bottom: 8px;
 }
 
-label {
-    min-width: 180px;
-}
-
-input[type="text"] {
+#option-input {
     flex: 1;
     padding: 8px;
-    border-radius: 6px;
-    border: 1px solid #5a2d8a;
-    background: #2a174f;
-    color: #fff;
+    font-size: 1rem;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+}
+
+#duplicate-msg {
+    color: #c00;
+    font-size: 0.9rem;
+    margin-bottom: 12px;
 }
 
 button {
-    padding: 8px 12px;
-    border-radius: 6px;
-    border: none;
-    background: #6bd3ff;
-    color: #04152a;
-    font-weight: bold;
+    padding: 8px 16px;
+    font-size: 1rem;
     cursor: pointer;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    background: #fff;
 }
 
-button:hover {
-    opacity: 0.95;
+button:hover:not(:disabled) {
+    background: #f0f0f0;
 }
 
-.options {
+button:disabled {
+    opacity: 0.5;
+    cursor: default;
+}
+
+#timer-section {
     display: flex;
-    flex-direction: column;
-    gap: 8px;
-    margin-top: 6px;
-}
-
-.option {
-    display: flex;
-    justify-content: space-between;
     align-items: center;
-    padding: 8px;
-    background: #2a174f;
-    border: 1px solid #40217a;
-    border-radius: 6px;
+    gap: 12px;
+    margin-bottom: 16px;
 }
 
-.option .text {
+.timer.active {
+    font-weight: bold;
+    color: #1a6e1a;
+}
+
+.timer.closed {
+    font-weight: bold;
+    color: #c00;
+}
+
+.option-item {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 10px 12px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    margin-bottom: 8px;
+}
+
+.option-label {
     flex: 1;
 }
 
-.share {
-    font-size: 0.9em;
-    color: var(--muted);
+.vote-btn {
+    padding: 4px 12px;
+    font-size: 0.9rem;
+    white-space: nowrap;
 }
 
-.note {
-    color: #c8b5ff;
-    font-size: 0.9em;
+.vote-btn.voted {
+    background: #e6f4e6;
+    border-color: #4a9e4a;
+    color: #2a6e2a;
 }
 
-.total {
-    font-weight: bold;
+
+#copy-btn {
+    margin-top: 16px;
+    width: 100%;
 }

vite.config.js

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import wasm from 'vite-plugin-wasm'
+import topLevelAwait from 'vite-plugin-top-level-await'
+
+export default defineConfig({
+  plugins: [wasm(), topLevelAwait()]
+})