From b552ccd547f265091934ba67b3c3d1be8e53b40a Mon Sep 17 00:00:00 2001
From: ValueOn AG <p.motsch@valueon.ch>
Date: Fri, 6 Mar 2026 12:40:50 +0100
Subject: [PATCH] chat: periodischer Scan fuer Teilnehmer-Nachrichten,
 Chat-Panel-Reopen wenn geschlossen

Made-with: Cursor
---
 src/bot/chatProcedure.ts | 72 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/src/bot/chatProcedure.ts b/src/bot/chatProcedure.ts
index 4302eba..dc3ea54 100644
--- a/src/bot/chatProcedure.ts
+++ b/src/bot/chatProcedure.ts
@@ -23,6 +23,7 @@ export class ChatProcedure {
   private _lastMessageText: string = '';
   private _botJoinedAtMs: number = 0;
   private _recentMessageKeyTimestamps: Map<string, number> = new Map();
+  private _scanIntervalId: ReturnType<typeof setInterval> | null = null;
 
   constructor(
     page: Page,
@@ -357,6 +358,72 @@ export class ChatProcedure {
     });
 
     this._logger.info(`Chat MutationObserver set up (target: ${chatObserverTarget})`);
+
+    this._startPeriodicChatScan();
+  }
+
+  /**
+   * Periodic scan as fallback: participant messages may load async and miss
+   * the MutationObserver (addedNode with empty placeholder, then content update).
+   * Also reopens the chat panel if it was closed (e.g. by user or Teams).
+   */
+  private _startPeriodicChatScan(): void {
+    if (this._scanIntervalId) return;
+    const intervalMs = 2500;
+    this._scanIntervalId = setInterval(async () => {
+      if (!this._isSubscribed || !this._page) return;
+      try {
+        const chatPanelOpen = await this._page.evaluate(() => {
+          const chatBtn = document.querySelector('button[id="chat-button"], button[data-tid="chat-button"]') as HTMLElement | null;
+          if (chatBtn?.getAttribute('aria-pressed') === 'true') return true;
+          const messageList = document.querySelector('[data-tid="message-pane-list"], [data-tid="chat-pane-list"], [data-tid="chat-pane"]') as HTMLElement | null;
+          return !!(messageList && messageList.offsetHeight > 50);
+        });
+        if (!chatPanelOpen) {
+          this._logger.info('Chat panel closed, reopening');
+          await this._openChatPanel();
+        }
+
+        const knownKeys = Array.from(this._recentMessageKeyTimestamps.keys());
+        const messages = await this._page.evaluate((knownKeysArr: string[]) => {
+          const known = new Set(knownKeysArr);
+          const noisePatterns = [
+            'meeting ended', 'meeting started', 'was invited', 'left the chat',
+            'joined the meeting', 'left the meeting', 'doesn\'t have a teams account',
+          ];
+          function isNoise(t: string) {
+            const l = t.toLowerCase();
+            return noisePatterns.some(p => l.includes(p));
+          }
+          const results: Array<{ speaker: string; text: string; timestamp: string; teamsTimestamp?: string; messageKey: string }> = [];
+          const seenThisScan = new Set<string>();
+          const container = document.querySelector('[data-tid="message-pane-list"], [data-tid="chat-pane-list"], [data-tid="chat-pane"]') || document.body;
+          const candidates = container.querySelectorAll('[data-tid="chat-message"], .fui-ChatMessage, [data-tid*="chat-pane-message"]');
+          for (const el of Array.from(candidates) as HTMLElement[]) {
+            const messageEl = el.closest?.('[data-tid="chat-message"], .fui-ChatMessage') || el;
+            let author = 'Unknown';
+            const authorEl = messageEl.querySelector('[data-tid="message-author"], [data-tid="message-author-name"], .fui-ChatMessage__author, [data-tid*="author"]');
+            if (authorEl?.textContent) author = authorEl.textContent.trim();
+            const bodyEl = messageEl.querySelector('[data-tid="message-body"], .fui-ChatMessage__body, [data-tid*="message-body"]');
+            const text = (bodyEl as HTMLElement)?.innerText?.trim() || '';
+            if (!text || text.length < 2 || isNoise(text)) continue;
+            const key = `${author}::${text}`;
+            if (known.has(key) || seenThisScan.has(key)) continue;
+            seenThisScan.add(key);
+            const timeEl = messageEl.querySelector('time[datetime], [data-tid*="timestamp"] time');
+            const ts = timeEl?.getAttribute?.('datetime') || new Date().toISOString();
+            results.push({ speaker: author, text, timestamp: ts, teamsTimestamp: ts, messageKey: key });
+          }
+          return results;
+        }, knownKeys);
+        for (const msg of messages) {
+          this._handleChatMessage(msg);
+        }
+      } catch {
+        // Page may be closed
+      }
+    }, intervalMs);
+    this._logger.info(`Chat periodic scan started (interval: ${intervalMs}ms)`);
   }
 
   /**
@@ -477,6 +544,11 @@ export class ChatProcedure {
   async unsubscribe(): Promise<void> {
     this._isSubscribed = false;
 
+    if (this._scanIntervalId) {
+      clearInterval(this._scanIntervalId);
+      this._scanIntervalId = null;
+    }
+
     try {
       await this._page.evaluate(() => {
         if ((window as any).__chatObserver) {