Added code.

client/public/data.js

@@ -0,0 +1,194 @@
+// coms/client/public/data.js
+// Data module: holds the in‐memory threads, notices and reply state
+
+// Map of all messages and notices by ID
+// Client’s own session ID
+let myId = null;
+const threads = new Map();
+
+// Map of connected users by unique ID
+const users = new Map();
+
+// Ordered list of root‐level IDs (messages and notices)
+const rootIds = [];
+
+// Negative counter to generate unique IDs for notices
+let noticeCounter = -1;
+
+// ID of the message we’re currently replying to (or null)
+let replyTo = null;
+
+// ID of the message currently focused for navigation (or null)
+let focusedId = null;
+
+/**
+ * Set the focused message ID (or null to clear).
+ * @param {number|null} id
+ */
+function setFocused(id) {
+  focusedId = id;
+}
+/**
+ * Get the currently focused message ID.
+ * @returns {number|null}
+ */
+function getFocused() {
+  return focusedId;
+}
+/**
+ * Clear the current focus.
+ */
+function clearFocused() {
+  focusedId = null;
+}
+
+// -- User management API ---
+
+/**
+ * Register a user with their unique ID.
+ * @param {number} id
+ * @param {string} name
+ */
+function addUser(id, name) {
+  users.set(id, name);
+}
+
+/**
+ * Remove a user by their ID.
+ * @param {number} id
+ */
+function removeUser(id) {
+  users.delete(id);
+}
+
+/**
+ * Update a user’s name.
+ * @param {number} id
+ * @param {string} name
+ */
+function updateUser(id, name) {
+  users.set(id, name);
+}
+
+/**
+ * Get a list of {id, name} objects for all users.
+ * @returns {{id:number, name:string}[]}
+ */
+function getUsers() {
+  return Array.from(users.entries()).map(([id, name]) => ({ id, name }));
+}
+
+/**
+ * Get grouped display strings: e.g. ["Anon (3x)", "Alice (1x)"]
+ * @returns {string[]}
+ */
+function getGroupedUsers() {
+  const counts = {};
+  for (const name of users.values()) {
+    counts[name] = (counts[name] || 0) + 1;
+  }
+  return Object.entries(counts).map(([name, count]) => {
+    const nameSpan = `<span class="name">${new Option(name).innerHTML}</span>`;
+    return count > 1 ? `${nameSpan} (${count}x)` : nameSpan;
+  });
+}
+
+/**
+ * Add a new chat message to the thread structure.
+ * @param {{id: number, username: string, content: string, ts: number, parent?: number}} msg
+ */
+function addMessage({ id, username, content, ts, parent = null }) {
+  threads.set(id, { id, username, content, ts, parent, children: [] });
+  if (parent !== null && threads.has(parent)) {
+    threads.get(parent).children.push(id);
+  } else {
+    rootIds.push(id);
+  }
+}
+
+/**
+ * Insert a system notice as a root‐level thread item.
+ * @param {string} content — HTML or plain text for the notice
+ */
+function addNotice(content) {
+  const ts = Math.floor(Date.now() / 1000);
+  const id = noticeCounter--;
+  threads.set(id, {
+    id,
+    username: "",
+    content,
+    ts,
+    parent: null,
+    children: [],
+  });
+  rootIds.push(id);
+}
+
+/**
+ * Reset all data (useful for unit tests or full re‐initialization).
+ */
+function clearData() {
+  threads.clear();
+  rootIds.length = 0;
+  noticeCounter = -1;
+  replyTo = null;
+}
+
+/** @returns {Map<number,object>} The threads map. */
+function getThreads() {
+  return threads;
+}
+
+/** @returns {number[]} The ordered list of root‐level IDs. */
+function getRootIds() {
+  return rootIds;
+}
+
+/**
+ * Set this client’s own session ID.
+ * @param {number} id
+ */
+function setMyId(id) {
+  myId = id;
+}
+
+/**
+ * Get this client’s own session ID.
+ * @returns {number|null}
+ */
+function getMyId() {
+  return myId;
+}
+
+/** @returns {number|null} The current reply‐to ID. */
+function getReplyTo() {
+  return replyTo;
+}
+
+/** @param {number|null} id — Set the current reply‐to ID. */
+function setReplyTo(id) {
+  replyTo = id;
+}
+
+export {
+  threads,
+  rootIds,
+  users,
+  addMessage,
+  addNotice,
+  addUser,
+  removeUser,
+  updateUser,
+  getUsers,
+  getGroupedUsers,
+  clearData,
+  getThreads,
+  getRootIds,
+  getReplyTo,
+  setReplyTo,
+  getFocused,
+  setFocused,
+  clearFocused,
+  setMyId,
+  getMyId,
+};