Add initial implementation of P2P Poll app with HTML, CSS, and JavaScript

app.js

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+// Minimal GUN-based P2P Poll scaffold (vanilla JS)
+
+(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();
+
+  // 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 currentPollId = null;
+  let pollsRef = null; // Gun node for /polls/{pollId}
+  let pollData = null; // local cache
+
+  // 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 updateTotalVotes() {
+    const opts = pollData && pollData.options ? pollData.options : {};
+    const total = Object.values(opts).reduce((sum, o) => sum + (o.votes || 0), 0);
+    totalVotesSpan.textContent = total;
+  }
+
+  // Load existing poll and subscribe to changes
+  function loadPoll(pollId) {
+    if (!pollId) return;
+
+    currentPollId = pollId;
+    pollIdDisplay.textContent = pollId;
+    pollsRef = gun.get('polls').get(pollId);
+
+    // 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
+    try {
+      const copy = JSON.parse(JSON.stringify(obj));
+      return copy;
+    } catch (e) {
+      // Fallback: return as-is if cannot stringify
+      return obj;
+    }
+  }
+
+  // Event bindings
+  loadPollBtn.addEventListener('click', () => {
+    const id = pollIdInput.value.trim();
+    if (!id) {
+      alert('Enter a Poll ID to load.');
+      return;
+    }
+    loadPoll(id);
+  });
+
+  createPollBtn.addEventListener('click', () => {
+    createPoll();
+  });
+
+  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);
+  }
+
+})();