From 79a361ba43a74d895b2ed28ebdb6913fbff4ee36 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Thu, 25 Jun 2020 21:57:36 +0400
Subject: [PATCH] Move call management to Core::App.

---
 Telegram/SourceFiles/api/api_updates.cpp      |  2 +-
 .../calls/calls_box_controller.cpp            | 14 +--
 Telegram/SourceFiles/calls/calls_call.cpp     | 75 ++++++++--------
 Telegram/SourceFiles/calls/calls_call.h       | 21 +++--
 Telegram/SourceFiles/calls/calls_instance.cpp | 88 +++++++++++--------
 Telegram/SourceFiles/calls/calls_instance.h   | 34 +++----
 Telegram/SourceFiles/calls/calls_panel.cpp    | 10 +--
 Telegram/SourceFiles/calls/calls_panel.h      |  2 +-
 Telegram/SourceFiles/calls/calls_top_bar.cpp  |  3 +-
 Telegram/SourceFiles/core/application.cpp     |  5 +-
 Telegram/SourceFiles/core/application.h       | 13 ++-
 Telegram/SourceFiles/data/data_changes.h      |  3 +-
 Telegram/SourceFiles/history/history.cpp      |  5 +-
 .../view/history_view_top_bar_widget.cpp      |  2 +-
 .../history/view/media/history_view_call.cpp  |  3 +-
 .../SourceFiles/info/info_wrap_widget.cpp     |  3 +-
 Telegram/SourceFiles/main/main_session.cpp    |  1 -
 Telegram/SourceFiles/main/main_session.h      |  9 --
 Telegram/SourceFiles/mainwidget.cpp           | 22 ++++-
 Telegram/SourceFiles/mainwidget.h             |  1 +
 .../media/player/media_player_instance.cpp    | 21 ++---
 .../media/view/media_view_overlay_widget.cpp  | 24 +++--
 .../SourceFiles/settings/settings_calls.cpp   | 10 +--
 23 files changed, 204 insertions(+), 167 deletions(-)

diff --git a/Telegram/SourceFiles/api/api_updates.cpp b/Telegram/SourceFiles/api/api_updates.cpp
index 1b099628ec..8eb4a07cb9 100644
--- a/Telegram/SourceFiles/api/api_updates.cpp
+++ b/Telegram/SourceFiles/api/api_updates.cpp
@@ -1721,7 +1721,7 @@ void Updates::feedUpdate(const MTPUpdate &update) {
 	} break;
 
 	case mtpc_updatePhoneCall: {
-		session().calls().handleUpdate(update.c_updatePhoneCall());
+		Core::App().calls().handleUpdate(&session(), update.c_updatePhoneCall());
 	} break;
 
 	case mtpc_updateUserBlocked: {
diff --git a/Telegram/SourceFiles/calls/calls_box_controller.cpp b/Telegram/SourceFiles/calls/calls_box_controller.cpp
index e7ff96d7f0..5f0cc6dcb7 100644
--- a/Telegram/SourceFiles/calls/calls_box_controller.cpp
+++ b/Telegram/SourceFiles/calls/calls_box_controller.cpp
@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "styles/style_boxes.h"
 #include "lang/lang_keys.h"
 #include "ui/effects/ripple_animation.h"
+#include "core/application.h"
 #include "calls/calls_instance.h"
 #include "history/history.h"
 #include "history/history_item.h"
@@ -18,6 +19,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/window_session_controller.h"
 #include "main/main_session.h"
 #include "data/data_session.h"
+#include "data/data_changes.h"
 #include "data/data_media_types.h"
 #include "data/data_user.h"
 #include "app.h"
@@ -237,11 +239,11 @@ void BoxController::prepare() {
 		}
 	}, lifetime());
 
-	subscribe(session().calls().newServiceMessage(), [=](FullMsgId msgId) {
-		if (const auto item = session().data().message(msgId)) {
-			insertRow(item, InsertWay::Prepend);
-		}
-	});
+	session().changes().messageUpdates(
+		Data::MessageUpdate::Flag::CallAdded
+	) | rpl::start_with_next([=](const Data::MessageUpdate &update) {
+		insertRow(update.item, InsertWay::Prepend);
+	}, lifetime());
 
 	delegate()->peerListSetTitle(tr::lng_call_box_title());
 	setDescriptionText(tr::lng_contacts_loading(tr::now));
@@ -315,7 +317,7 @@ void BoxController::rowActionClicked(not_null<PeerListRow*> row) {
 	auto user = row->peer()->asUser();
 	Assert(user != nullptr);
 
-	user->session().calls().startOutgoingCall(user);
+	Core::App().calls().startOutgoingCall(user);
 }
 
 void BoxController::receivedCalls(const QVector<MTPMessage> &result) {
diff --git a/Telegram/SourceFiles/calls/calls_call.cpp b/Telegram/SourceFiles/calls/calls_call.cpp
index e317b6a38c..0a72867281 100644
--- a/Telegram/SourceFiles/calls/calls_call.cpp
+++ b/Telegram/SourceFiles/calls/calls_call.cpp
@@ -131,7 +131,8 @@ bool Call::isIncomingWaiting() const {
 	if (type() != Call::Type::Incoming) {
 		return false;
 	}
-	return (_state == State::Starting) || (_state == State::WaitingIncoming);
+	return (state() == State::Starting)
+		|| (state() == State::WaitingIncoming);
 }
 
 void Call::start(bytes::const_span random) {
@@ -142,13 +143,14 @@ void Call::start(bytes::const_span random) {
 	Assert(!_dhConfig.p.empty());
 
 	generateModExpFirst(random);
-	if (_state == State::Starting || _state == State::Requesting) {
+	const auto state = _state.current();
+	if (state == State::Starting || state == State::Requesting) {
 		if (_type == Type::Outgoing) {
 			startOutgoing();
 		} else {
 			startIncoming();
 		}
-	} else if (_state == State::ExchangingKeys
+	} else if (state == State::ExchangingKeys
 		&& _answerAfterDhConfigReceived) {
 		answer();
 	}
@@ -156,7 +158,7 @@ void Call::start(bytes::const_span random) {
 
 void Call::startOutgoing() {
 	Expects(_type == Type::Outgoing);
-	Expects(_state == State::Requesting);
+	Expects(_state.current() == State::Requesting);
 	Expects(_gaHash.size() == kSha256Size);
 
 	_api.request(MTPphone_RequestCall(
@@ -206,12 +208,12 @@ void Call::startOutgoing() {
 
 void Call::startIncoming() {
 	Expects(_type == Type::Incoming);
-	Expects(_state == State::Starting);
+	Expects(_state.current() == State::Starting);
 
 	_api.request(MTPphone_ReceivedCall(
 		MTP_inputPhoneCall(MTP_long(_id), MTP_long(_accessHash))
 	)).done([=](const MTPBool &result) {
-		if (_state == State::Starting) {
+		if (_state.current() == State::Starting) {
 			setState(State::WaitingIncoming);
 		}
 	}).fail([=](const RPCError &error) {
@@ -228,8 +230,9 @@ void Call::answer() {
 void Call::actuallyAnswer() {
 	Expects(_type == Type::Incoming);
 
-	if (_state != State::Starting && _state != State::WaitingIncoming) {
-		if (_state != State::ExchangingKeys
+	const auto state = _state.current();
+	if (state != State::Starting && state != State::WaitingIncoming) {
+		if (state != State::ExchangingKeys
 			|| !_answerAfterDhConfigReceived) {
 			return;
 		}
@@ -280,10 +283,11 @@ crl::time Call::getDurationMs() const {
 }
 
 void Call::hangup() {
-	if (_state == State::Busy) {
+	const auto state = _state.current();
+	if (state == State::Busy) {
 		_delegate->callFinished(this);
 	} else {
-		auto missed = (_state == State::Ringing || (_state == State::Waiting && _type == Type::Outgoing));
+		auto missed = (state == State::Ringing || (state == State::Waiting && _type == Type::Outgoing));
 		auto declined = isIncomingWaiting();
 		auto reason = missed ? MTP_phoneCallDiscardReasonMissed() :
 			declined ? MTP_phoneCallDiscardReasonBusy() : MTP_phoneCallDiscardReasonHangup();
@@ -292,7 +296,7 @@ void Call::hangup() {
 }
 
 void Call::redial() {
-	if (_state != State::Busy) {
+	if (_state.current() != State::Busy) {
 		return;
 	}
 	Assert(_controller == nullptr);
@@ -384,7 +388,7 @@ bool Call::handleUpdate(const MTPPhoneCall &call) {
 			return false;
 		}
 		if (_type == Type::Outgoing
-			&& _state == State::Waiting
+			&& _state.current() == State::Waiting
 			&& data.vreceive_date().value_or_empty() != 0) {
 			const auto &config = _user->session().serverConfig();
 			_discardByTimeoutTimer.callOnce(config.callRingTimeoutMs);
@@ -399,7 +403,7 @@ bool Call::handleUpdate(const MTPPhoneCall &call) {
 			return false;
 		}
 		if (_type == Type::Incoming
-			&& _state == State::ExchangingKeys
+			&& _state.current() == State::ExchangingKeys
 			&& !_controller) {
 			startConfirmedCall(data);
 		}
@@ -432,7 +436,8 @@ bool Call::handleUpdate(const MTPPhoneCall &call) {
 		}
 		if (reason && reason->type() == mtpc_phoneCallDiscardReasonBusy) {
 			setState(State::Busy);
-		} else if (_type == Type::Outgoing || _state == State::HangingUp) {
+		} else if (_type == Type::Outgoing
+			|| _state.current() == State::HangingUp) {
 			setState(State::Ended);
 		} else {
 			setState(State::EndedByOtherDevice);
@@ -460,7 +465,7 @@ bool Call::handleUpdate(const MTPPhoneCall &call) {
 void Call::confirmAcceptedCall(const MTPDphoneCallAccepted &call) {
 	Expects(_type == Type::Outgoing);
 
-	if (_state == State::ExchangingKeys
+	if (_state.current() == State::ExchangingKeys
 		|| _controller) {
 		LOG(("Call Warning: Unexpected confirmAcceptedCall."));
 		return;
@@ -710,34 +715,33 @@ bool Call::checkCallFields(const MTPDphoneCallAccepted &call) {
 }
 
 void Call::setState(State state) {
-	if (_state == State::Failed) {
+	if (_state.current() == State::Failed) {
 		return;
 	}
-	if (_state == State::FailedHangingUp && state != State::Failed) {
+	if (_state.current() == State::FailedHangingUp && state != State::Failed) {
 		return;
 	}
-	if (_state != state) {
+	if (_state.current() != state) {
 		_state = state;
-		_stateChanged.notify(state, true);
 
 		if (true
-			&& _state != State::Starting
-			&& _state != State::Requesting
-			&& _state != State::Waiting
-			&& _state != State::WaitingIncoming
-			&& _state != State::Ringing) {
+			&& state != State::Starting
+			&& state != State::Requesting
+			&& state != State::Waiting
+			&& state != State::WaitingIncoming
+			&& state != State::Ringing) {
 			_waitingTrack.reset();
 		}
 		if (false
-			|| _state == State::Ended
-			|| _state == State::EndedByOtherDevice
-			|| _state == State::Failed
-			|| _state == State::Busy) {
+			|| state == State::Ended
+			|| state == State::EndedByOtherDevice
+			|| state == State::Failed
+			|| state == State::Busy) {
 			// Destroy controller before destroying Call Panel,
 			// so that the panel hide animation is smooth.
 			destroyController();
 		}
-		switch (_state) {
+		switch (state) {
 		case State::Established:
 			_startTime = crl::now();
 			break;
@@ -794,16 +798,17 @@ void Call::finish(FinishType type, const MTPPhoneCallDiscardReason &reason) {
 
 	auto finalState = (type == FinishType::Ended) ? State::Ended : State::Failed;
 	auto hangupState = (type == FinishType::Ended) ? State::HangingUp : State::FailedHangingUp;
-	if (_state == State::Requesting) {
+	const auto state = _state.current();
+	if (state == State::Requesting) {
 		_finishByTimeoutTimer.call(kHangupTimeoutMs, [this, finalState] { setState(finalState); });
 		_finishAfterRequestingCall = type;
 		return;
 	}
-	if (_state == State::HangingUp
-		|| _state == State::FailedHangingUp
-		|| _state == State::EndedByOtherDevice
-		|| _state == State::Ended
-		|| _state == State::Failed) {
+	if (state == State::HangingUp
+		|| state == State::FailedHangingUp
+		|| state == State::EndedByOtherDevice
+		|| state == State::Ended
+		|| state == State::Failed) {
 		return;
 	}
 	if (!_id) {
diff --git a/Telegram/SourceFiles/calls/calls_call.h b/Telegram/SourceFiles/calls/calls_call.h
index 2f91c9fe1b..265e74671b 100644
--- a/Telegram/SourceFiles/calls/calls_call.h
+++ b/Telegram/SourceFiles/calls/calls_call.h
@@ -60,13 +60,13 @@ public:
 	};
 	Call(not_null<Delegate*> delegate, not_null<UserData*> user, Type type);
 
-	Type type() const {
+	[[nodiscard]] Type type() const {
 		return _type;
 	}
-	not_null<UserData*> user() const {
+	[[nodiscard]] not_null<UserData*> user() const {
 		return _user;
 	}
-	bool isIncomingWaiting() const;
+	[[nodiscard]] bool isIncomingWaiting() const;
 
 	void start(bytes::const_span random);
 	bool handleUpdate(const MTPPhoneCall &call);
@@ -89,10 +89,10 @@ public:
 		Busy,
 	};
 	State state() const {
-		return _state;
+		return _state.current();
 	}
-	base::Observable<State> &stateChanged() {
-		return _stateChanged;
+	rpl::producer<State> stateValue() const {
+		return _state.value();
 	}
 
 	static constexpr auto kSignalBarStarting = -1;
@@ -126,6 +126,10 @@ public:
 	void setAudioVolume(bool input, float level);
 	void setAudioDuckingEnabled(bool enabled);
 
+	[[nodiscard]] rpl::lifetime &lifetime() {
+		return _lifetime;
+	}
+
 	~Call();
 
 private:
@@ -166,10 +170,9 @@ private:
 	not_null<UserData*> _user;
 	MTP::Sender _api;
 	Type _type = Type::Outgoing;
-	State _state = State::Starting;
+	rpl::variable<State> _state = State::Starting;
 	FinishType _finishAfterRequestingCall = FinishType::None;
 	bool _answerAfterDhConfigReceived = false;
-	base::Observable<State> _stateChanged;
 	int _signalBarCount = kSignalBarStarting;
 	base::Observable<int> _signalBarCountChanged;
 	crl::time _startTime = 0;
@@ -195,6 +198,8 @@ private:
 
 	std::unique_ptr<Media::Audio::Track> _waitingTrack;
 
+	rpl::lifetime _lifetime;
+
 };
 
 void UpdateConfig(const std::string &data);
diff --git a/Telegram/SourceFiles/calls/calls_instance.cpp b/Telegram/SourceFiles/calls/calls_instance.cpp
index ffd3312141..5c700db204 100644
--- a/Telegram/SourceFiles/calls/calls_instance.cpp
+++ b/Telegram/SourceFiles/calls/calls_instance.cpp
@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "mtproto/mtproto_dh_utils.h"
 #include "core/application.h"
 #include "main/main_session.h"
+#include "main/main_account.h"
 #include "apiwrap.h"
 #include "lang/lang_keys.h"
 #include "boxes/confirm_box.h"
@@ -32,9 +33,14 @@ constexpr auto kServerConfigUpdateTimeoutMs = 24 * 3600 * crl::time(1000);
 
 } // namespace
 
-Instance::Instance(not_null<Main::Session*> session)
-: _session(session)
-, _api(&_session->mtp()) {
+Instance::Instance() = default;
+
+Instance::~Instance() {
+	for (const auto panel : _pendingPanels) {
+		if (panel) {
+			delete panel;
+		}
+	}
 }
 
 void Instance::startOutgoingCall(not_null<UserData*> user) {
@@ -44,8 +50,9 @@ void Instance::startOutgoingCall(not_null<UserData*> user) {
 	}
 	if (user->callsStatus() == UserData::CallsStatus::Private) {
 		// Request full user once more to refresh the setting in case it was changed.
-		_session->api().requestFullPeer(user);
-		Ui::show(Box<InformBox>(tr::lng_call_error_not_available(tr::now, lt_user, user->name)));
+		user->session().api().requestFullPeer(user);
+		Ui::show(Box<InformBox>(
+			tr::lng_call_error_not_available(tr::now, lt_user, user->name)));
 		return;
 	}
 	requestMicrophonePermissionOrFail(crl::guard(this, [=] {
@@ -101,8 +108,9 @@ void Instance::playSound(Sound sound) {
 void Instance::destroyCall(not_null<Call*> call) {
 	if (_currentCall.get() == call) {
 		destroyCurrentPanel();
-		_currentCall.reset();
-		_currentCallChanged.notify(nullptr, true);
+		auto taken = base::take(_currentCall);
+		_currentCallChanges.fire(nullptr);
+		taken.reset();
 
 		if (App::quitting()) {
 			LOG(("Calls::Instance doesn't prevent quit any more."));
@@ -123,17 +131,24 @@ void Instance::destroyCurrentPanel() {
 }
 
 void Instance::createCall(not_null<UserData*> user, Call::Type type) {
-	auto call = std::make_unique<Call>(getCallDelegate(), user, type);;
+	auto call = std::make_unique<Call>(getCallDelegate(), user, type);
+	const auto raw = call.get();
+
+	user->session().account().sessionChanges(
+	) | rpl::start_with_next([=] {
+		destroyCall(raw);
+	}, raw->lifetime());
+
 	if (_currentCall) {
-		_currentCallPanel->replaceCall(call.get());
+		_currentCallPanel->replaceCall(raw);
 		std::swap(_currentCall, call);
 		call->hangup();
 	} else {
-		_currentCallPanel = std::make_unique<Panel>(call.get());
+		_currentCallPanel = std::make_unique<Panel>(raw);
 		_currentCall = std::move(call);
 	}
-	_currentCallChanged.notify(_currentCall.get(), true);
-	refreshServerConfig();
+	_currentCallChanges.fire_copy(raw);
+	refreshServerConfig(&user->session());
 	refreshDhConfig();
 }
 
@@ -141,7 +156,7 @@ void Instance::refreshDhConfig() {
 	Expects(_currentCall != nullptr);
 
 	const auto weak = base::make_weak(_currentCall);
-	_api.request(MTPmessages_GetDhConfig(
+	_currentCall->user()->session().api().request(MTPmessages_GetDhConfig(
 		MTP_int(_dhConfig.version),
 		MTP_int(MTP::ModExpFirst::kRandomPowerSize)
 	)).done([=](const MTPmessages_DhConfig &result) {
@@ -198,27 +213,32 @@ bytes::const_span Instance::updateDhConfig(
 	});
 }
 
-void Instance::refreshServerConfig() {
-	if (_serverConfigRequestId) {
+void Instance::refreshServerConfig(not_null<Main::Session*> session) {
+	if (_serverConfigRequestSession) {
 		return;
 	}
-	if (_lastServerConfigUpdateTime && (crl::now() - _lastServerConfigUpdateTime) < kServerConfigUpdateTimeoutMs) {
+	if (_lastServerConfigUpdateTime
+		&& ((crl::now() - _lastServerConfigUpdateTime)
+			< kServerConfigUpdateTimeoutMs)) {
 		return;
 	}
-	_serverConfigRequestId = _api.request(MTPphone_GetCallConfig(
+	_serverConfigRequestSession = session;
+	session->api().request(MTPphone_GetCallConfig(
 	)).done([=](const MTPDataJSON &result) {
-		_serverConfigRequestId = 0;
+		_serverConfigRequestSession = nullptr;
 		_lastServerConfigUpdateTime = crl::now();
 
 		const auto &json = result.c_dataJSON().vdata().v;
 		UpdateConfig(std::string(json.data(), json.size()));
 	}).fail([=](const RPCError &error) {
-		_serverConfigRequestId = 0;
-	}).send();
+		_serverConfigRequestSession = nullptr;
+		}).send();
 }
 
-void Instance::handleUpdate(const MTPDupdatePhoneCall& update) {
-	handleCallUpdate(update.vphone_call());
+void Instance::handleUpdate(
+		not_null<Main::Session*> session,
+		const MTPDupdatePhoneCall& update) {
+	handleCallUpdate(session, update.vphone_call());
 }
 
 void Instance::showInfoPanel(not_null<Call*> call) {
@@ -239,18 +259,20 @@ bool Instance::isQuitPrevent() {
 	return true;
 }
 
-void Instance::handleCallUpdate(const MTPPhoneCall &call) {
+void Instance::handleCallUpdate(
+		not_null<Main::Session*> session,
+		const MTPPhoneCall &call) {
 	if (call.type() == mtpc_phoneCallRequested) {
 		auto &phoneCall = call.c_phoneCallRequested();
-		auto user = _session->data().userLoaded(phoneCall.vadmin_id().v);
+		auto user = session->data().userLoaded(phoneCall.vadmin_id().v);
 		if (!user) {
 			LOG(("API Error: User not loaded for phoneCallRequested."));
 		} else if (user->isSelf()) {
 			LOG(("API Error: Self found in phoneCallRequested."));
 		}
-		const auto &config = _session->serverConfig();
+		const auto &config = session->serverConfig();
 		if (alreadyInCall() || !user || user->isSelf()) {
-			_api.request(MTPphone_DiscardCall(
+			session->api().request(MTPphone_DiscardCall(
 				MTP_flags(0),
 				MTP_inputPhoneCall(phoneCall.vid(), phoneCall.vaccess_hash()),
 				MTP_int(0),
@@ -273,10 +295,14 @@ bool Instance::alreadyInCall() {
 	return (_currentCall && _currentCall->state() != Call::State::Busy);
 }
 
-Call *Instance::currentCall() {
+Call *Instance::currentCall() const {
 	return _currentCall.get();
 }
 
+rpl::producer<Call*> Instance::currentCallValue() const {
+	return _currentCallChanges.events_starting_with(currentCall());
+}
+
 void Instance::requestMicrophonePermissionOrFail(Fn<void()> onSuccess) {
 	Platform::PermissionStatus status=Platform::GetPermissionStatus(Platform::PermissionType::Microphone);
 	if (status==Platform::PermissionStatus::Granted) {
@@ -302,12 +328,4 @@ void Instance::requestMicrophonePermissionOrFail(Fn<void()> onSuccess) {
 	}
 }
 
-Instance::~Instance() {
-	for (auto panel : _pendingPanels) {
-		if (panel) {
-			delete panel;
-		}
-	}
-}
-
 } // namespace Calls
diff --git a/Telegram/SourceFiles/calls/calls_instance.h b/Telegram/SourceFiles/calls/calls_instance.h
index d8987f4582..92a6ad58a5 100644
--- a/Telegram/SourceFiles/calls/calls_instance.h
+++ b/Telegram/SourceFiles/calls/calls_instance.h
@@ -29,24 +29,18 @@ class Instance
 	, private base::Subscriber
 	, public base::has_weak_ptr {
 public:
-	explicit Instance(not_null<Main::Session*> session);
+	Instance();
+	~Instance();
 
 	void startOutgoingCall(not_null<UserData*> user);
-	void handleUpdate(const MTPDupdatePhoneCall &update);
+	void handleUpdate(
+		not_null<Main::Session*> session,
+		const MTPDupdatePhoneCall &update);
 	void showInfoPanel(not_null<Call*> call);
-	Call* currentCall();
+	[[nodiscard]] Call *currentCall() const;
+	[[nodiscard]] rpl::producer<Call*> currentCallValue() const;
 
-	base::Observable<Call*> &currentCallChanged() {
-		return _currentCallChanged;
-	}
-
-	base::Observable<FullMsgId> &newServiceMessage() {
-		return _newServiceMessage;
-	}
-
-	bool isQuitPrevent();
-
-	~Instance();
+	[[nodiscard]] bool isQuitPrevent();
 
 private:
 	not_null<Call::Delegate*> getCallDelegate() {
@@ -66,21 +60,21 @@ private:
 	void requestMicrophonePermissionOrFail(Fn<void()> onSuccess) override;
 
 	void refreshDhConfig();
-	void refreshServerConfig();
+	void refreshServerConfig(not_null<Main::Session*> session);
 	bytes::const_span updateDhConfig(const MTPmessages_DhConfig &data);
 
 	bool alreadyInCall();
-	void handleCallUpdate(const MTPPhoneCall &call);
-
-	const not_null<Main::Session*> _session;
-	MTP::Sender _api;
+	void handleCallUpdate(
+		not_null<Main::Session*> session,
+		const MTPPhoneCall &call);
 
 	DhConfig _dhConfig;
 
 	crl::time _lastServerConfigUpdateTime = 0;
-	mtpRequestId _serverConfigRequestId = 0;
+	base::weak_ptr<Main::Session> _serverConfigRequestSession;
 
 	std::unique_ptr<Call> _currentCall;
+	rpl::event_stream<Call*> _currentCallChanges;
 	std::unique_ptr<Panel> _currentCallPanel;
 	base::Observable<Call*> _currentCallChanged;
 	base::Observable<FullMsgId> _newServiceMessage;
diff --git a/Telegram/SourceFiles/calls/calls_panel.cpp b/Telegram/SourceFiles/calls/calls_panel.cpp
index 465799906e..1442e8894d 100644
--- a/Telegram/SourceFiles/calls/calls_panel.cpp
+++ b/Telegram/SourceFiles/calls/calls_panel.cpp
@@ -405,11 +405,11 @@ void Panel::initControls() {
 void Panel::reinitControls() {
 	Expects(_call != nullptr);
 
-	unsubscribe(base::take(_stateChangedSubscription));
-	_stateChangedSubscription = subscribe(
-		_call->stateChanged(),
-		[=](State state) { stateChanged(state); });
-	stateChanged(_call->state());
+	_stateLifetime.destroy();
+	_call->stateValue(
+	) | rpl::start_with_next([=](State state) {
+		stateChanged(state);
+	}, _stateLifetime);
 
 	_signalBars.create(
 		this,
diff --git a/Telegram/SourceFiles/calls/calls_panel.h b/Telegram/SourceFiles/calls/calls_panel.h
index a674cb66df..697fe26a31 100644
--- a/Telegram/SourceFiles/calls/calls_panel.h
+++ b/Telegram/SourceFiles/calls/calls_panel.h
@@ -130,7 +130,7 @@ private:
 	QPoint _dragStartMousePosition;
 	QPoint _dragStartMyPosition;
 
-	int _stateChangedSubscription = 0;
+	rpl::lifetime _stateLifetime;
 
 	class Button;
 	object_ptr<Button> _answerHangupRedial;
diff --git a/Telegram/SourceFiles/calls/calls_top_bar.cpp b/Telegram/SourceFiles/calls/calls_top_bar.cpp
index 1eb33b46ee..c70a540929 100644
--- a/Telegram/SourceFiles/calls/calls_top_bar.cpp
+++ b/Telegram/SourceFiles/calls/calls_top_bar.cpp
@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/labels.h"
 #include "ui/wrap/padding_wrap.h"
 #include "lang/lang_keys.h"
+#include "core/application.h"
 #include "calls/calls_call.h"
 #include "calls/calls_instance.h"
 #include "calls/calls_panel.h"
@@ -118,7 +119,7 @@ void TopBar::initControls() {
 				&& (_info->clickModifiers() & Qt::ControlModifier)) {
 				Ui::show(Box<DebugInfoBox>(_call));
 			} else {
-				call->user()->session().calls().showInfoPanel(call);
+				Core::App().calls().showInfoPanel(call);
 			}
 		}
 	});
diff --git a/Telegram/SourceFiles/core/application.cpp b/Telegram/SourceFiles/core/application.cpp
index c709b98acb..dc02b35c37 100644
--- a/Telegram/SourceFiles/core/application.cpp
+++ b/Telegram/SourceFiles/core/application.cpp
@@ -101,14 +101,15 @@ Application::Application(not_null<Launcher*> launcher)
 , _databases(std::make_unique<Storage::Databases>())
 , _animationsManager(std::make_unique<Ui::Animations::Manager>())
 , _clearEmojiImageLoaderTimer([=] { clearEmojiSourceImages(); })
+, _audio(std::make_unique<Media::Audio::Instance>())
 , _fallbackProductionConfig(
 	std::make_unique<MTP::Config>(MTP::Environment::Production))
 , _domain(std::make_unique<Main::Domain>(cDataFile()))
 , _exportManager(std::make_unique<Export::Manager>())
+, _calls(std::make_unique<Calls::Instance>())
 , _langpack(std::make_unique<Lang::Instance>())
 , _langCloudManager(std::make_unique<Lang::CloudManager>(langpack()))
 , _emojiKeywords(std::make_unique<ChatHelpers::EmojiKeywords>())
-, _audio(std::make_unique<Media::Audio::Instance>())
 , _logo(Window::LoadLogo())
 , _logoNoMargin(Window::LoadLogoNoMargin())
 , _autoLockTimer([=] { checkAutoLock(); }) {
@@ -943,7 +944,7 @@ void Application::QuitAttempt() {
 		if (const auto session = App().maybeActiveSession()) {
 			if (session->updates().isQuitPrevent()
 				|| session->api().isQuitPrevent()
-				|| session->calls().isQuitPrevent()) {
+				|| App().calls().isQuitPrevent()) {
 				App().quitDelayed();
 				return;
 			}
diff --git a/Telegram/SourceFiles/core/application.h b/Telegram/SourceFiles/core/application.h
index ce61b5ad1d..b39d3d81ed 100644
--- a/Telegram/SourceFiles/core/application.h
+++ b/Telegram/SourceFiles/core/application.h
@@ -95,6 +95,10 @@ namespace Export {
 class Manager;
 } // namespace Export
 
+namespace Calls {
+class Instance;
+} // namespace Calls
+
 namespace Core {
 
 class Launcher;
@@ -231,6 +235,11 @@ public:
 		not_null<Media::Player::FloatDelegate*> replacement);
 	[[nodiscard]] rpl::producer<FullMsgId> floatPlayerClosed() const;
 
+	// Calls.
+	Calls::Instance &calls() const {
+		return *_calls;
+	}
+
 	void logout(Main::Account *account = nullptr);
 	void forceLogOut(
 		not_null<Main::Account*> account,
@@ -319,9 +328,11 @@ private:
 	const std::unique_ptr<Ui::Animations::Manager> _animationsManager;
 	crl::object_on_queue<Stickers::EmojiImageLoader> _emojiImageLoader;
 	base::Timer _clearEmojiImageLoaderTimer;
+	const std::unique_ptr<Media::Audio::Instance> _audio;
 	mutable std::unique_ptr<MTP::Config> _fallbackProductionConfig;
 	const std::unique_ptr<Main::Domain> _domain;
 	const std::unique_ptr<Export::Manager> _exportManager;
+	const std::unique_ptr<Calls::Instance> _calls;
 	std::unique_ptr<Window::Controller> _window;
 	std::unique_ptr<Media::View::OverlayWidget> _mediaView;
 	const std::unique_ptr<Lang::Instance> _langpack;
@@ -331,8 +342,6 @@ private:
 	base::Observable<void> _passcodedChanged;
 	QPointer<Ui::BoxContent> _badProxyDisableBox;
 
-	const std::unique_ptr<Media::Audio::Instance> _audio;
-
 	std::unique_ptr<Media::Player::FloatController> _floatPlayers;
 	Media::Player::FloatDelegate *_defaultFloatPlayerDelegate = nullptr;
 	Media::Player::FloatDelegate *_replacementFloatPlayerDelegate = nullptr;
diff --git a/Telegram/SourceFiles/data/data_changes.h b/Telegram/SourceFiles/data/data_changes.h
index fd38841c20..db5230ab5e 100644
--- a/Telegram/SourceFiles/data/data_changes.h
+++ b/Telegram/SourceFiles/data/data_changes.h
@@ -132,8 +132,9 @@ struct MessageUpdate {
 		Destroyed        = (1 << 1),
 		DialogRowRepaint = (1 << 2),
 		DialogRowRefresh = (1 << 3),
+		CallAdded        = (1 << 4),
 
-		LastUsedBit      = (1 << 3),
+		LastUsedBit      = (1 << 4),
 	};
 	using Flags = base::flags<Flag>;
 	friend inline constexpr auto is_flag_type(Flag) { return true; }
diff --git a/Telegram/SourceFiles/history/history.cpp b/Telegram/SourceFiles/history/history.cpp
index 10b06b58e9..4f5b3bf8f9 100644
--- a/Telegram/SourceFiles/history/history.cpp
+++ b/Telegram/SourceFiles/history/history.cpp
@@ -1238,8 +1238,9 @@ void History::applyServiceChanges(
 	} break;
 
 	case mtpc_messageActionPhoneCall: {
-		item->history()->session().calls().newServiceMessage().notify(
-			item->fullId());
+		item->history()->session().changes().messageUpdated(
+			item,
+			Data::MessageUpdate::Flag::CallAdded);
 	} break;
 	}
 }
diff --git a/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp b/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp
index ecd1add0b1..0bfbc2b2b9 100644
--- a/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_top_bar_widget.cpp
@@ -194,7 +194,7 @@ void TopBarWidget::onSearch() {
 void TopBarWidget::onCall() {
 	if (const auto peer = _activeChat.peer()) {
 		if (const auto user = peer->asUser()) {
-			user->session().calls().startOutgoingCall(user);
+			Core::App().calls().startOutgoingCall(user);
 		}
 	}
 }
diff --git a/Telegram/SourceFiles/history/view/media/history_view_call.cpp b/Telegram/SourceFiles/history/view/media/history_view_call.cpp
index 1d534f7e94..29127eb763 100644
--- a/Telegram/SourceFiles/history/view/media/history_view_call.cpp
+++ b/Telegram/SourceFiles/history/view/media/history_view_call.cpp
@@ -13,6 +13,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history_item.h"
 #include "history/view/history_view_element.h"
 #include "history/view/history_view_cursor_state.h"
+#include "core/application.h"
 #include "calls/calls_instance.h"
 #include "data/data_media_types.h"
 #include "data/data_user.h"
@@ -50,7 +51,7 @@ QSize Call::countOptimalSize() {
 	const auto user = _parent->data()->history()->peer->asUser();
 	_link = std::make_shared<LambdaClickHandler>([=] {
 		if (user) {
-			user->session().calls().startOutgoingCall(user);
+			Core::App().calls().startOutgoingCall(user);
 		}
 	});
 
diff --git a/Telegram/SourceFiles/info/info_wrap_widget.cpp b/Telegram/SourceFiles/info/info_wrap_widget.cpp
index c56ac00acc..ae5753a00c 100644
--- a/Telegram/SourceFiles/info/info_wrap_widget.cpp
+++ b/Telegram/SourceFiles/info/info_wrap_widget.cpp
@@ -20,6 +20,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/dropdown_menu.h"
 #include "ui/wrap/fade_wrap.h"
 #include "ui/search_field_controller.h"
+#include "core/application.h"
 #include "calls/calls_instance.h"
 #include "core/shortcuts.h"
 #include "window/window_session_controller.h"
@@ -500,7 +501,7 @@ void WrapWidget::addProfileCallsButton() {
 					? st::infoLayerTopBarCall
 					: st::infoTopBarCall))
 		)->addClickHandler([=] {
-			user->session().calls().startOutgoingCall(user);
+			Core::App().calls().startOutgoingCall(user);
 		});
 	}, _topBar->lifetime());
 
diff --git a/Telegram/SourceFiles/main/main_session.cpp b/Telegram/SourceFiles/main/main_session.cpp
index fc7915899e..21aa198fea 100644
--- a/Telegram/SourceFiles/main/main_session.cpp
+++ b/Telegram/SourceFiles/main/main_session.cpp
@@ -72,7 +72,6 @@ Session::Session(
 , _settings(std::move(settings))
 , _api(std::make_unique<ApiWrap>(this))
 , _updates(std::make_unique<Api::Updates>(this))
-, _calls(std::make_unique<Calls::Instance>(this))
 , _downloader(std::make_unique<Storage::DownloadManagerMtproto>(_api.get()))
 , _uploader(std::make_unique<Storage::Uploader>(_api.get()))
 , _storage(std::make_unique<Storage::Facade>())
diff --git a/Telegram/SourceFiles/main/main_session.h b/Telegram/SourceFiles/main/main_session.h
index b7eebe925b..7425e028ff 100644
--- a/Telegram/SourceFiles/main/main_session.h
+++ b/Telegram/SourceFiles/main/main_session.h
@@ -47,10 +47,6 @@ class SessionController;
 struct TermsLock;
 } // namespace Window
 
-namespace Calls {
-class Instance;
-} // namespace Calls
-
 namespace Stickers {
 class EmojiPack;
 class DicePacks;
@@ -133,10 +129,6 @@ public:
 		return *_api;
 	}
 
-	[[nodiscard]] Calls::Instance &calls() {
-		return *_calls;
-	}
-
 	// Terms lock.
 	void lockByTerms(const Window::TermsLock &data);
 	void unlockTerms();
@@ -166,7 +158,6 @@ private:
 	const std::unique_ptr<SessionSettings> _settings;
 	const std::unique_ptr<ApiWrap> _api;
 	const std::unique_ptr<Api::Updates> _updates;
-	const std::unique_ptr<Calls::Instance> _calls;
 	const std::unique_ptr<Storage::DownloadManagerMtproto> _downloader;
 	const std::unique_ptr<Storage::Uploader> _uploader;
 	const std::unique_ptr<Storage::Facade> _storage;
diff --git a/Telegram/SourceFiles/mainwidget.cpp b/Telegram/SourceFiles/mainwidget.cpp
index 5f44469354..dc3303a3f0 100644
--- a/Telegram/SourceFiles/mainwidget.cpp
+++ b/Telegram/SourceFiles/mainwidget.cpp
@@ -245,9 +245,13 @@ MainWidget::MainWidget(
 	connect(_dialogs, SIGNAL(cancelled()), this, SLOT(dialogsCancelled()));
 	connect(_history, &HistoryWidget::cancelled, [=] { handleHistoryBack(); });
 
-	subscribe(session().calls().currentCallChanged(), [=](Calls::Call *call) {
+	Core::App().calls().currentCallValue(
+	) | rpl::start_with_next([=](Calls::Call *call) {
 		setCurrentCall(call);
-	});
+	}, lifetime());
+	if (_callTopBar) {
+		_callTopBar->finishAnimating();
+	}
 
 	Core::App().setDefaultFloatPlayerDelegate(floatPlayerDelegate());
 	Core::App().floatPlayerClosed(
@@ -943,16 +947,18 @@ void MainWidget::playerHeightUpdated() {
 }
 
 void MainWidget::setCurrentCall(Calls::Call *call) {
+	_currentCallLifetime.destroy();
 	_currentCall = call;
 	if (_currentCall) {
-		subscribe(_currentCall->stateChanged(), [this](Calls::Call::State state) {
+		_currentCall->stateValue(
+		) | rpl::start_with_next([=](Calls::Call::State state) {
 			using State = Calls::Call::State;
 			if (state == State::Established) {
 				createCallTopBar();
 			} else {
 				destroyCallTopBar();
 			}
-		});
+		}, _currentCallLifetime);
 	} else {
 		destroyCallTopBar();
 	}
@@ -2036,6 +2042,10 @@ void MainWidget::hideAll() {
 		_player->setVisible(false);
 		_playerHeight = 0;
 	}
+	if (_callTopBar) {
+		_callTopBar->setVisible(false);
+		_callTopBarHeight = 0;
+	}
 }
 
 void MainWidget::showAll() {
@@ -2091,6 +2101,10 @@ void MainWidget::showAll() {
 		_player->setVisible(true);
 		_playerHeight = _player->contentHeight();
 	}
+	if (_callTopBar) {
+		_callTopBar->setVisible(true);
+		_callTopBarHeight = _callTopBar->height();
+	}
 	updateControlsGeometry();
 	floatPlayerCheckVisibility();
 
diff --git a/Telegram/SourceFiles/mainwidget.h b/Telegram/SourceFiles/mainwidget.h
index c60732d3ed..4b0239c24f 100644
--- a/Telegram/SourceFiles/mainwidget.h
+++ b/Telegram/SourceFiles/mainwidget.h
@@ -373,6 +373,7 @@ private:
 	std::unique_ptr<Window::ConnectionState> _connecting;
 
 	base::weak_ptr<Calls::Call> _currentCall;
+	rpl::lifetime _currentCallLifetime;
 	object_ptr<Ui::SlideWrap<Calls::TopBar>> _callTopBar = { nullptr };
 
 	Export::View::PanelController *_currentExportView = nullptr;
diff --git a/Telegram/SourceFiles/media/player/media_player_instance.cpp b/Telegram/SourceFiles/media/player/media_player_instance.cpp
index c71fe14cc2..e5c5bebf95 100644
--- a/Telegram/SourceFiles/media/player/media_player_instance.cpp
+++ b/Telegram/SourceFiles/media/player/media_player_instance.cpp
@@ -114,19 +114,14 @@ Instance::Instance()
 		handleSongUpdate(audioId);
 	});
 
-	// While we have one Media::Player::Instance for all sessions we have to do this.
-	Core::App().domain().activeSessionValue(
-	) | rpl::start_with_next([=](Main::Session *session) {
-		if (session) {
-			subscribe(session->calls().currentCallChanged(), [=](Calls::Call *call) {
-				if (call) {
-					pauseOnCall(AudioMsgId::Type::Voice);
-					pauseOnCall(AudioMsgId::Type::Song);
-				} else {
-					resumeOnCall(AudioMsgId::Type::Voice);
-					resumeOnCall(AudioMsgId::Type::Song);
-				}
-			});
+	Core::App().calls().currentCallValue(
+	) | rpl::start_with_next([=](Calls::Call *call) {
+		if (call) {
+			pauseOnCall(AudioMsgId::Type::Voice);
+			pauseOnCall(AudioMsgId::Type::Song);
+		} else {
+			resumeOnCall(AudioMsgId::Type::Voice);
+			resumeOnCall(AudioMsgId::Type::Song);
 		}
 	}, _lifetime);
 
diff --git a/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp b/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp
index 3be0fc4968..327aaa1bf4 100644
--- a/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp
+++ b/Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp
@@ -341,6 +341,17 @@ OverlayWidget::OverlayWidget()
 		setWindowState(Qt::WindowFullScreen);
 	}
 
+	Core::App().calls().currentCallValue(
+	) | rpl::start_with_next([=](Calls::Call *call) {
+		if (!_streamed) {
+			return;
+		} else if (call) {
+			playbackPauseOnCall();
+		} else {
+			playbackResumeOnCall();
+		}
+	}, lifetime());
+
 	_saveMsgUpdater.setSingleShot(true);
 	connect(&_saveMsgUpdater, SIGNAL(timeout()), this, SLOT(updateImage()));
 
@@ -3530,19 +3541,6 @@ void OverlayWidget::setSession(not_null<Main::Session*> session) {
 		}
 	}, _sessionLifetime);
 
-	base::ObservableViewer(
-		session->calls().currentCallChanged()
-	) | rpl::start_with_next([=](Calls::Call *call) {
-		if (!_streamed) {
-			return;
-		}
-		if (call) {
-			playbackPauseOnCall();
-		} else {
-			playbackResumeOnCall();
-		}
-	}, _sessionLifetime);
-
 	base::ObservableViewer(
 		session->documentUpdated
 	) | rpl::start_with_next([=](DocumentData *document) {
diff --git a/Telegram/SourceFiles/settings/settings_calls.cpp b/Telegram/SourceFiles/settings/settings_calls.cpp
index 68f14a3054..ddfbef47c1 100644
--- a/Telegram/SourceFiles/settings/settings_calls.cpp
+++ b/Telegram/SourceFiles/settings/settings_calls.cpp
@@ -135,7 +135,7 @@ void Calls::setupContent() {
 			Core::App().settings().setCallOutputDeviceID(
 				QString::fromStdString(deviceId));
 			_controller->session().saveSettingsDelayed();
-			if (const auto call = _controller->session().calls().currentCall()) {
+			if (const auto call = Core::App().calls().currentCall()) {
 				call->setCurrentAudioDevice(false, deviceId);
 			}
 		});
@@ -165,7 +165,7 @@ void Calls::setupContent() {
 		_needWriteSettings = true;
 		updateOutputLabel(value);
 		Core::App().settings().setCallOutputVolume(value);
-		if (const auto call = _controller->session().calls().currentCall()) {
+		if (const auto call = Core::App().calls().currentCall()) {
 			call->setAudioVolume(false, value / 100.0f);
 		}
 	};
@@ -214,7 +214,7 @@ void Calls::setupContent() {
 			if (_micTester) {
 				stopTestingMicrophone();
 			}
-			if (const auto call = _controller->session().calls().currentCall()) {
+			if (const auto call = Core::App().calls().currentCall()) {
 				call->setCurrentAudioDevice(true, deviceId);
 			}
 		});
@@ -244,7 +244,7 @@ void Calls::setupContent() {
 		_needWriteSettings = true;
 		updateInputLabel(value);
 		Core::App().settings().setCallInputVolume(value);
-		if (const auto call = _controller->session().calls().currentCall()) {
+		if (const auto call = Core::App().calls().currentCall()) {
 			call->setAudioVolume(true, value / 100.0f);
 		}
 	};
@@ -299,7 +299,7 @@ void Calls::setupContent() {
 	}) | rpl::start_with_next([=](bool enabled) {
 		Core::App().settings().setCallAudioDuckingEnabled(enabled);
 		Core::App().saveSettingsDelayed();
-		if (const auto call = _controller->session().calls().currentCall()) {
+		if (const auto call = Core::App().calls().currentCall()) {
 			call->setAudioDuckingEnabled(enabled);
 		}
 	}, content->lifetime());