Phase 4: Support LID identity scheme and fix incoming message parsing

whatsapp-gateway/baileys-client.js

@@ -229,7 +229,34 @@ async function disconnectSession(session_key) {
     }
 }
 
+/**
+ * Send a message using an active session
+ */
+async function sendMessage(session_key, phone, message, mediaUrl = null) {
+    const sock = sessions.get(session_key);
+    if (!sock) {
+        throw new Error(`Session ${session_key} is not active or connected`);
+    }
+
+    let jid = phone.includes('@') ? phone : `${phone}@s.whatsapp.net`;
+    
+    if (mediaUrl) {
+        const ext = mediaUrl.split('.').pop().toLowerCase();
+        if (['jpg', 'jpeg', 'png', 'webp'].includes(ext)) {
+            return await sock.sendMessage(jid, { image: { url: mediaUrl }, caption: message });
+        } else if (['mp4', 'mkv', 'avi'].includes(ext)) {
+            return await sock.sendMessage(jid, { video: { url: mediaUrl }, caption: message });
+        } else {
+            return await sock.sendMessage(jid, { document: { url: mediaUrl }, caption: message, fileName: mediaUrl.split('/').pop() });
+        }
+    }
+    
+    return await sock.sendMessage(jid, { text: message });
+}
+
 module.exports = {
     startSession,
-    disconnectSession
+    disconnectSession,
+    sendMessage
 };
+