/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 * Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
 * Copyright (C) 2015 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Google Inc. nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef RTCPeerConnection_h
#define RTCPeerConnection_h

#if ENABLE(MEDIA_STREAM)

#include "ActiveDOMObject.h"
#include "Dictionary.h"
#include "EventTarget.h"
// FIXME: Workaround for bindings bug http://webkit.org/b/150121
#include "JSMediaStream.h"
#include "PeerConnectionBackend.h"
#include "RTCRtpReceiver.h"
#include "RTCRtpSender.h"
#include "ScriptWrappable.h"
#include <wtf/HashMap.h>
#include <wtf/RefCounted.h>

namespace WebCore {

class MediaStream;
class MediaStreamTrack;
class PeerConnectionBackend;
class RTCConfiguration;
class RTCDataChannel;
class RTCIceCandidate;
class RTCPeerConnectionErrorCallback;
class RTCSessionDescription;
class RTCStatsCallback;

class RTCPeerConnection final : public RefCounted<RTCPeerConnection>, public PeerConnectionBackendClient, public RTCRtpSenderClient, public EventTargetWithInlineData, public ActiveDOMObject {
public:
    static RefPtr<RTCPeerConnection> create(ScriptExecutionContext&, const Dictionary& rtcConfiguration, ExceptionCode&);
    ~RTCPeerConnection();

    Vector<RefPtr<RTCRtpSender>> getSenders() const override { return m_senderSet; }
    Vector<RefPtr<RTCRtpReceiver>> getReceivers() const { return m_receiverSet; }

    RefPtr<RTCRtpSender> addTrack(RefPtr<MediaStreamTrack>&&, Vector<MediaStream*>, ExceptionCode&);
    void removeTrack(RTCRtpSender*, ExceptionCode&);

    void queuedCreateOffer(const Dictionary& offerOptions, PeerConnection::SessionDescriptionPromise&&);
    void queuedCreateAnswer(const Dictionary& answerOptions, PeerConnection::SessionDescriptionPromise&&);

    void queuedSetLocalDescription(RTCSessionDescription*, PeerConnection::VoidPromise&&);
    RefPtr<RTCSessionDescription> localDescription() const;
    RefPtr<RTCSessionDescription> currentLocalDescription() const;
    RefPtr<RTCSessionDescription> pendingLocalDescription() const;

    void queuedSetRemoteDescription(RTCSessionDescription*, PeerConnection::VoidPromise&&);
    RefPtr<RTCSessionDescription> remoteDescription() const;
    RefPtr<RTCSessionDescription> currentRemoteDescription() const;
    RefPtr<RTCSessionDescription> pendingRemoteDescription() const;

    String signalingState() const;

    void queuedAddIceCandidate(RTCIceCandidate*, PeerConnection::VoidPromise&&);

    String iceGatheringState() const;
    String iceConnectionState() const;

    RTCConfiguration* getConfiguration() const;
    void setConfiguration(const Dictionary& configuration, ExceptionCode&);

    void privateGetStats(MediaStreamTrack*, PeerConnection::StatsPromise&&);
    void privateGetStats(PeerConnection::StatsPromise&&);

    RefPtr<RTCDataChannel> createDataChannel(String label, const Dictionary& dataChannelDict, ExceptionCode&);

    void close();

    // EventTarget
    virtual EventTargetInterface eventTargetInterface() const override { return RTCPeerConnectionEventTargetInterfaceType; }
    virtual ScriptExecutionContext* scriptExecutionContext() const override { return ActiveDOMObject::scriptExecutionContext(); }

    using RefCounted<RTCPeerConnection>::ref;
    using RefCounted<RTCPeerConnection>::deref;

private:
    RTCPeerConnection(ScriptExecutionContext&, RefPtr<RTCConfiguration>&&, ExceptionCode&);

    // EventTarget implementation.
    virtual void refEventTarget() override { ref(); }
    virtual void derefEventTarget() override { deref(); }

    // ActiveDOMObject
    void stop() override;
    const char* activeDOMObjectName() const override;
    bool canSuspendForDocumentSuspension() const override;

    // PeerConnectionBackendClient
    void setSignalingState(PeerConnectionStates::SignalingState) override;
    void updateIceGatheringState(PeerConnectionStates::IceGatheringState) override;
    void updateIceConnectionState(PeerConnectionStates::IceConnectionState) override;

    void scheduleNegotiationNeededEvent() override;

    void fireEvent(Event&) override;
    PeerConnectionStates::SignalingState internalSignalingState() const override { return m_signalingState; }
    PeerConnectionStates::IceGatheringState internalIceGatheringState() const override { return m_iceGatheringState; }
    PeerConnectionStates::IceConnectionState internalIceConnectionState() const override { return m_iceConnectionState; }

    // RTCRtpSenderClient
    void replaceTrack(RTCRtpSender&, MediaStreamTrack&, PeerConnection::VoidPromise&&) override;

    PeerConnectionStates::SignalingState m_signalingState;
    PeerConnectionStates::IceGatheringState m_iceGatheringState;
    PeerConnectionStates::IceConnectionState m_iceConnectionState;

    Vector<RefPtr<RTCRtpSender>> m_senderSet;
    Vector<RefPtr<RTCRtpReceiver>> m_receiverSet;

    Vector<RefPtr<RTCDataChannel>> m_dataChannels;

    std::unique_ptr<PeerConnectionBackend> m_backend;

    RefPtr<RTCConfiguration> m_configuration;

    bool m_stopped;
};

} // namespace WebCore

#endif // ENABLE(MEDIA_STREAM)

#endif // RTCPeerConnection_h