Expose phone busy event to desktop call interface

tools/chatgui/src/callwindow.h

@@ -18,7 +18,7 @@ class CallVideoWindow;
 class CallWindow : public QWidget {
     Q_OBJECT
 public:
-    enum State { Outgoing, Ringing, Incoming, Active, Ended };
+    enum State { Outgoing, Ringing, Incoming, Active, Ended, WaitDecision };
 
     explicit CallWindow(QWidget* parent = nullptr);
     ~CallWindow() override;
@@ -78,6 +78,7 @@ private:
     QLabel*      m_connectionLabel;
     QLabel*      m_statsLabel;
     QPushButton* m_acceptBtn;
+    QPushButton* m_continueBtn; /* явное разрешение начать вызов занятого телефона */
     QPushButton* m_declineBtn;
     QPushButton* m_hangupBtn;
     QPushButton* m_muteBtn;

tools/chatgui/transport/gui_bridge.h

@@ -201,6 +201,7 @@ void gui_bridge_set_call_incoming_cb(gui_call_incoming_fn cb);
 /* Callback для звонкового события с call_id (ringing/accepted) */
 typedef void (*gui_call_id_fn)(uint64_t call_id);
 void gui_bridge_set_call_ringing_cb(gui_call_id_fn cb);
+void gui_bridge_set_call_phone_busy_cb(gui_call_id_fn cb);
 void gui_bridge_set_call_accepted_cb(gui_call_id_fn cb);
 
 /* Callback для завершения/отклонения звонка (вызывается из GUI-потока) */

tools/chatgui/transport/gui_bridge_impl.cpp

@@ -58,6 +58,7 @@ static gui_local_event_fn g_local_invite_cb = nullptr;
 static gui_local_event_fn g_local_delivery_cb = nullptr;
 static gui_call_incoming_fn          g_call_incoming_cb        = nullptr;
 static gui_call_id_fn                g_call_ringing_cb         = nullptr;
+static gui_call_id_fn                g_call_phone_busy_cb      = nullptr;
 static gui_call_id_fn                g_call_accepted_cb        = nullptr;
 static gui_call_ended_fn             g_call_ended_cb           = nullptr;
 static gui_call_ended_fn             g_call_declined_cb        = nullptr;
@@ -375,6 +376,12 @@ void GuiBridgeReceiver::processPost(int eventType, QByteArray data) {
             if (g_call_ringing_cb) g_call_ringing_cb(callId);
         }
         break;
+    case CHAT_EVT_CALL_PHONE_BUSY:
+        if (dlen == 9) {
+            uint64_t callId; memcpy(&callId, d, 8);
+            if (g_call_phone_busy_cb) g_call_phone_busy_cb(callId);
+        } else DEBUG_WARN(DEBUG_CATEGORY_CALL, "gui_bridge: invalid PHONE_BUSY bytes=%d", dlen);
+        break;
     case GUI_EVT_CALL_ACCEPTED:
         if (dlen >= 8) {
             uint64_t callId; memcpy(&callId, d, 8);
@@ -604,6 +611,7 @@ void gui_bridge_set_call_incoming_cb(gui_call_incoming_fn cb) {
 void gui_bridge_set_call_ringing_cb(gui_call_id_fn cb) {
     g_call_ringing_cb = cb;
 }
+void gui_bridge_set_call_phone_busy_cb(gui_call_id_fn cb) { g_call_phone_busy_cb = cb; }
 
 void gui_bridge_set_call_accepted_cb(gui_call_id_fn cb) {
     g_call_accepted_cb = cb;