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/*
 * media-session-p.h
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 * Copyright (C) 2010-2017 Belledonne Communications SARL
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 *
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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
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 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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 */

#ifndef _MEDIA_SESSION_P_H_
#define _MEDIA_SESSION_P_H_

#include <utility>

#include "call-session-p.h"

#include "media-session.h"
#include "port-config.h"
#include "nat/ice-agent.h"
#include "nat/stun-client.h"

#include "linphone/call_stats.h"

// =============================================================================

LINPHONE_BEGIN_NAMESPACE

class MediaSessionPrivate : public CallSessionPrivate {
public:
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	MediaSessionPrivate () = default;
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public:
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	static int resumeAfterFailedTransfer (void *userData, unsigned int);
	static bool_t startPendingRefer (void *userData);
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	static void stunAuthRequestedCb (void *userData, const char *realm, const char *nonce, const char **username, const char **password, const char **ha1);

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	void accepted () override;
	void ackReceived (LinphoneHeaders *headers) override;
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	void dtmfReceived (char dtmf);
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	bool failure () override;
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	void pauseForTransfer ();
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	void pausedByRemote ();
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	void remoteRinging () override;
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	int resumeAfterFailedTransfer ();
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	void resumed ();
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	void startPendingRefer ();
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	void telephoneEventReceived (int event);
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	void terminated () override;
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	void updated (bool isUpdate);
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	void updating (bool isUpdate) override;
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	void enableSymmetricRtp (bool value);
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	void oglRender () const;
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	void sendVfu ();

	void clearIceCheckList (IceCheckList *cl);
	void deactivateIce ();
	void prepareStreamsForIceGathering (bool hasVideo);
	void stopStreamsForIceGathering ();

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	int getAf () const { return af; }
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	bool getAudioMuted () const { return audioMuted; }
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	MediaSessionParams *getCurrentParams () const { return static_cast<MediaSessionParams *>(currentParams); }
	MediaSessionParams *getParams () const { return static_cast<MediaSessionParams *>(params); }
	MediaSessionParams *getRemoteParams () const { return static_cast<MediaSessionParams *>(remoteParams); }
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	void setCurrentParams (MediaSessionParams *msp);
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	void setParams (MediaSessionParams *msp);
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	void setRemoteParams (MediaSessionParams *msp);
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	IceSession *getIceSession () const { return iceAgent->getIceSession(); }
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	SalMediaDescription *getLocalDesc () const { return localDesc; }
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	unsigned int getMediaStartCount () const;
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	MediaStream *getMediaStream (LinphoneStreamType type) const;
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	LinphoneNatPolicy *getNatPolicy () const { return natPolicy; }
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	int getRtcpPort (LinphoneStreamType type) const;
	int getRtpPort (LinphoneStreamType type) const;
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	LinphoneCallStats *getStats (LinphoneStreamType type) const;
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	int getStreamIndex (LinphoneStreamType type) const;
	int getStreamIndex (MediaStream *ms) const;
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	SalCallOp * getOp () const { return op; }
	void setAudioMuted (bool value) { audioMuted = value; }
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	void initializeStreams ();
	void stopStreams ();

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	// CoreListener
	void onNetworkReachable (bool reachable) override;

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private:
	static OrtpJitterBufferAlgorithm jitterBufferNameToAlgo (const std::string &name);

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#ifdef VIDEO_ENABLED
	static void videoStreamEventCb (void *userData, const MSFilter *f, const unsigned int eventId, const void *args);
#endif // ifdef VIDEO_ENABLED
#ifdef TEST_EXT_RENDERER
	static void extRendererCb (void *userData, const MSPicture *local, const MSPicture *remote);
#endif // ifdef TEST_EXT_RENDERER
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	static void realTimeTextCharacterReceived (void *userData, MSFilter *f, unsigned int id, void *arg);
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	static int sendDtmf (void *data, unsigned int revents);
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	static float aggregateQualityRatings (float audioRating, float videoRating);

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	std::shared_ptr<Participant> getMe () const;
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	void setState (LinphoneCallState newState, const std::string &message) override;
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	void computeStreamsIndexes (const SalMediaDescription *md);
	void fixCallParams (SalMediaDescription *rmd);
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	void initializeParamsAccordingToIncomingCallParams () override;
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	void setCompatibleIncomingCallParams (SalMediaDescription *md);
	void updateBiggestDesc (SalMediaDescription *md);
	void updateRemoteSessionIdAndVer ();

	void initStats (LinphoneCallStats *stats, LinphoneStreamType type);
	void notifyStatsUpdated (int streamIndex) const;

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	OrtpEvQueue *getEventQueue (int streamIndex) const;
	MediaStream *getMediaStream (int streamIndex) const;
	MSWebCam *getVideoDevice () const;
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	void fillMulticastMediaAddresses ();
	int selectFixedPort (int streamIndex, std::pair<int, int> portRange);
	int selectRandomPort (int streamIndex, std::pair<int, int> portRange);
	void setPortConfig (int streamIndex, std::pair<int, int> portRange);
	void setPortConfigFromRtpSession (int streamIndex, RtpSession *session);
	void setRandomPortConfig (int streamIndex);

	void discoverMtu (const Address &remoteAddr);
	std::string getBindIpForStream (int streamIndex);
	void getLocalIp (const Address &remoteAddr);
	std::string getPublicIpForStream (int streamIndex);
	void runStunTestsIfNeeded ();
	void selectIncomingIpVersion ();
	void selectOutgoingIpVersion ();

	void forceStreamsDirAccordingToState (SalMediaDescription *md);
	bool generateB64CryptoKey (size_t keyLength, char *keyOut, size_t keyOutSize);
	void makeLocalMediaDescription ();
	int setupEncryptionKey (SalSrtpCryptoAlgo *crypto, MSCryptoSuite suite, unsigned int tag);
	void setupDtlsKeys (SalMediaDescription *md);
	void setupEncryptionKeys (SalMediaDescription *md);
	void setupRtcpFb (SalMediaDescription *md);
	void setupRtcpXr (SalMediaDescription *md);
	void setupZrtpHash (SalMediaDescription *md);
	void transferAlreadyAssignedPayloadTypes (SalMediaDescription *oldMd, SalMediaDescription *md);
	void updateLocalMediaDescriptionFromIce ();

	SalMulticastRole getMulticastRole (SalStreamType type);
	void joinMulticastGroup (int streamIndex, MediaStream *ms);

	int findCryptoIndexFromTag (const SalSrtpCryptoAlgo crypto[], unsigned char tag);
	void setDtlsFingerprint (MSMediaStreamSessions *sessions, const SalStreamDescription *sd, const SalStreamDescription *remote);
	void setDtlsFingerprintOnAllStreams ();
	void setupDtlsParams (MediaStream *ms);
	void setZrtpCryptoTypesParameters (MSZrtpParams *params);
	void startDtls (MSMediaStreamSessions *sessions, const SalStreamDescription *sd, const SalStreamDescription *remote);
	void startDtlsOnAllStreams ();
	void updateCryptoParameters (SalMediaDescription *oldMd, SalMediaDescription *newMd);
	bool updateStreamCryptoParameters (const SalStreamDescription *localStreamDesc, SalStreamDescription *oldStream, SalStreamDescription *newStream, MediaStream *ms);

	int getIdealAudioBandwidth (const SalMediaDescription *md, const SalStreamDescription *desc);
	int getVideoBandwidth (const SalMediaDescription *md, const SalStreamDescription *desc);
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	RtpProfile *makeProfile (const SalMediaDescription *md, const SalStreamDescription *desc, int *usedPt);
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	void unsetRtpProfile (int streamIndex);
	void updateAllocatedAudioBandwidth (const PayloadType *pt, int maxbw);

	void applyJitterBufferParams (RtpSession *session, LinphoneStreamType type);
	void clearEarlyMediaDestination (MediaStream *ms);
	void clearEarlyMediaDestinations ();
	void configureAdaptiveRateControl (MediaStream *ms, const OrtpPayloadType *pt, bool videoWillBeUsed);
	void configureRtpSessionForRtcpFb (const SalStreamDescription *stream);
	void configureRtpSessionForRtcpXr (SalStreamType type);
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	RtpSession *createAudioRtpIoSession ();
	RtpSession *createVideoRtpIoSession ();
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	void freeResources ();
	void handleIceEvents (OrtpEvent *ev);
	void handleStreamEvents (int streamIndex);
	void initializeAudioStream ();
	void initializeTextStream ();
	void initializeVideoStream ();
	void prepareEarlyMediaForking ();
	void postConfigureAudioStreams (bool muted);
	void setSymmetricRtp (bool value);
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	void setupRingbackPlayer ();
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	void startAudioStream (LinphoneCallState targetState, bool videoWillBeUsed);
	void startStreams (LinphoneCallState targetState);
	void startTextStream ();
	void startVideoStream (LinphoneCallState targetState);
	void stopAudioStream ();
	void stopTextStream ();
	void stopVideoStream ();
	void tryEarlyMediaForking (SalMediaDescription *md);
	void updateFrozenPayloads (SalMediaDescription *result);
	void updateStreams (SalMediaDescription *newMd, LinphoneCallState targetState);
	void updateStreamsDestinations (SalMediaDescription *oldMd, SalMediaDescription *newMd);

	bool allStreamsAvpfEnabled () const;
	bool allStreamsEncrypted () const;
	bool atLeastOneStreamStarted () const;
	void audioStreamAuthTokenReady (const std::string &authToken, bool verified);
	void audioStreamEncryptionChanged (bool encrypted);
	uint16_t getAvpfRrInterval () const;
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	unsigned int getNbActiveStreams () const;
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	bool isEncryptionMandatory () const;
	int mediaParametersChanged (SalMediaDescription *oldMd, SalMediaDescription *newMd);
	void propagateEncryptionChanged ();

	void fillLogStats (MediaStream *st);
	void updateLocalStats (LinphoneCallStats *stats, MediaStream *stream) const;
	void updateRtpStats (LinphoneCallStats *stats, int streamIndex);

	bool mediaReportEnabled (int statsType);
	bool qualityReportingEnabled () const;
	void updateReportingCallState ();
	void updateReportingMediaInfo (int statsType);

	void executeBackgroundTasks (bool oneSecondElapsed);
	void reportBandwidth ();
	void reportBandwidthForStream (MediaStream *ms, LinphoneStreamType type);

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	void abort (const std::string &errorMsg) override;
	void handleIncomingReceivedStateInIncomingNotification () override;
	bool isReadyForInvite () const override;
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	LinphoneStatus pause ();
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	int restartInvite () override;
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	void setTerminated () override;
	LinphoneStatus startAcceptUpdate (LinphoneCallState nextState, const std::string &stateInfo) override;
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	LinphoneStatus startUpdate (const std::string &subject = "") override;
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	void terminate () override;
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	void updateCurrentParams () const override;
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	void accept (const MediaSessionParams *params, bool wasRinging);
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	LinphoneStatus acceptUpdate (const CallSessionParams *csp, LinphoneCallState nextState, const std::string &stateInfo) override;
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	void refreshSockets ();
	void reinviteToRecoverFromConnectionLoss () override;

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#ifdef VIDEO_ENABLED
	void videoStreamEventCb (const MSFilter *f, const unsigned int eventId, const void *args);
#endif // ifdef VIDEO_ENABLED
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	void realTimeTextCharacterReceived (MSFilter *f, unsigned int id, void *arg);
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	int sendDtmf ();
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	void stunAuthRequestedCb (const char *realm, const char *nonce, const char **username, const char **password, const char **ha1);

private:
	static const std::string ecStateStore;
	static const int ecStateMaxLen;

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	std::weak_ptr<Participant> me;

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	AudioStream *audioStream = nullptr;
	OrtpEvQueue *audioStreamEvQueue = nullptr;
	LinphoneCallStats *audioStats = nullptr;
	RtpProfile *audioProfile = nullptr;
	RtpProfile *rtpIoAudioProfile = nullptr;
	int mainAudioStreamIndex = LINPHONE_CALL_STATS_AUDIO;

	VideoStream *videoStream = nullptr;
	OrtpEvQueue *videoStreamEvQueue = nullptr;
	LinphoneCallStats *videoStats = nullptr;
	RtpProfile *rtpIoVideoProfile = nullptr;
	RtpProfile *videoProfile = nullptr;
	int mainVideoStreamIndex = LINPHONE_CALL_STATS_VIDEO;
	void *videoWindowId = nullptr;
	bool cameraEnabled = true;

	TextStream *textStream = nullptr;
	OrtpEvQueue *textStreamEvQueue = nullptr;
	LinphoneCallStats *textStats = nullptr;
	RtpProfile *textProfile = nullptr;
	int mainTextStreamIndex = LINPHONE_CALL_STATS_TEXT;

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	LinphoneNatPolicy *natPolicy = nullptr;
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	StunClient *stunClient = nullptr;
	IceAgent *iceAgent = nullptr;

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	// The address family to prefer for RTP path, guessed from signaling path.
	int af;

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	std::string dtmfSequence;
	belle_sip_source_t *dtmfTimer = nullptr;

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	std::string mediaLocalIp;
	PortConfig mediaPorts[SAL_MEDIA_DESCRIPTION_MAX_STREAMS];
	bool needMediaLocalIpRefresh = false;
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	// The rtp, srtp, zrtp contexts for each stream.
	MSMediaStreamSessions sessions[SAL_MEDIA_DESCRIPTION_MAX_STREAMS];

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	SalMediaDescription *localDesc = nullptr;
	int localDescChanged = 0;
	SalMediaDescription *biggestDesc = nullptr;
	SalMediaDescription *resultDesc = nullptr;
	bool expectMediaInAck = false;
	unsigned int remoteSessionId = 0;
	unsigned int remoteSessionVer = 0;

	std::string authToken;
	bool authTokenVerified = false;
	std::string dtlsCertificateFingerprint;

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	unsigned int mediaStartCount = 0;
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	// Upload bandwidth setting at the time the call is started. Used to detect if it changes during a call.
	int upBandwidth = 0;

	// Upload bandwidth used by audio.
	int audioBandwidth = 0;
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	bool allMuted = false;
	bool audioMuted = false;
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	bool automaticallyPaused = false;
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	bool pausedByApp = false;
	bool recordActive = false;

	std::string onHoldFile;

	L_DECLARE_PUBLIC(MediaSession);
};

LINPHONE_END_NAMESPACE

#endif // ifndef _MEDIA_SESSION_P_H_