/*
 * Copyright (C) 2017 Apple Inc. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY 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.
 */

#include "config.h"
#include "LibWebRTCSocket.h"

#if USE(LIBWEBRTC)

#include "DataReference.h"
#include "LibWebRTCSocketFactory.h"
#include "NetworkProcessConnection.h"
#include "NetworkRTCSocketMessages.h"
#include "WebProcess.h"
#include <WebCore/SharedBuffer.h>
#include <wtf/Function.h>
#include <wtf/MainThread.h>

namespace WebKit {

static inline void sendOnMainThread(Function<void(IPC::Connection&)>&& callback)
{
    callOnMainThread([callback = WTFMove(callback)]() {
        callback(WebProcess::singleton().networkConnection().connection());
    });
}

LibWebRTCSocket::LibWebRTCSocket(LibWebRTCSocketFactory& factory, uint64_t identifier, Type type, const rtc::SocketAddress& localAddress, const rtc::SocketAddress& remoteAddress)
    : m_factory(factory)
    , m_identifier(identifier)
    , m_type(type)
    , m_localAddress(localAddress)
    , m_remoteAddress(remoteAddress)
{
    memset(&m_options, 1, MAX_SOCKET_OPTION);
}

LibWebRTCSocket::~LibWebRTCSocket()
{
    m_factory.detach(*this);
}

rtc::SocketAddress LibWebRTCSocket::GetLocalAddress() const
{
    return m_localAddress;
}

rtc::SocketAddress LibWebRTCSocket::GetRemoteAddress() const
{
    return m_remoteAddress;
}

void LibWebRTCSocket::signalAddressReady(const rtc::SocketAddress& address)
{
    m_localAddress = address;
    m_state = (m_type == Type::ClientTCP) ? STATE_CONNECTED : STATE_BOUND;
    SignalAddressReady(this, m_localAddress);
}

void LibWebRTCSocket::signalReadPacket(const WebCore::SharedBuffer& buffer, rtc::SocketAddress&& address, int64_t timestamp)
{
    m_remoteAddress = WTFMove(address);
    SignalReadPacket(this, buffer.data(), buffer.size(), m_remoteAddress, rtc::PacketTime(timestamp, 0));
}

void LibWebRTCSocket::signalSentPacket(int rtcPacketID, int64_t sendTimeMs)
{
    m_availableSendingBytes += m_beingSentPacketSizes.takeFirst();
    SignalSentPacket(this, rtc::SentPacket(rtcPacketID, sendTimeMs));
    if (m_shouldSignalReadyToSend) {
        m_shouldSignalReadyToSend = false;
        SignalReadyToSend(this);
    }
}

void LibWebRTCSocket::signalConnect()
{
    m_state = STATE_CONNECTED;
    SignalConnect(this);
}

void LibWebRTCSocket::signalClose(int error)
{
    m_state = STATE_CLOSED;
    SignalClose(this, error);
}

static inline String authKey(const rtc::PacketOptions& options)
{
    if (options.packet_time_params.srtp_auth_key.size() <= 0)
        return { };
    return String(options.packet_time_params.srtp_auth_key.data(), options.packet_time_params.srtp_auth_key.size());
}

bool LibWebRTCSocket::willSend(size_t size)
{
    if (size > m_availableSendingBytes) {
        m_shouldSignalReadyToSend = true;
        setError(EWOULDBLOCK);
        return false;
    }
    m_availableSendingBytes -= size;
    m_beingSentPacketSizes.append(size);
    return true;
}

int LibWebRTCSocket::SendTo(const void *value, size_t size, const rtc::SocketAddress& address, const rtc::PacketOptions& options)
{
    if (!willSend(size))
        return -1;

    auto buffer = WebCore::SharedBuffer::create(static_cast<const uint8_t*>(value), size);
    auto identifier = this->identifier();

    sendOnMainThread([identifier, buffer = WTFMove(buffer), address, options](IPC::Connection& connection) {
        IPC::DataReference data(reinterpret_cast<const uint8_t*>(buffer->data()), buffer->size());
        String srtpAuthKey = authKey(options);
        Messages::NetworkRTCSocket::SendTo message(data, RTCNetwork::SocketAddress(address), options.packet_id, options.packet_time_params.rtp_sendtime_extension_id, srtpAuthKey, options.packet_time_params.srtp_packet_index, options.dscp);
        connection.send(WTFMove(message), identifier);
    });
    return size;
}

int LibWebRTCSocket::Close()
{
    auto identifier = this->identifier();
    sendOnMainThread([identifier](IPC::Connection& connection) {
        connection.send(Messages::NetworkRTCSocket::Close(), identifier);
    });
    return 0;
}

int LibWebRTCSocket::GetOption(rtc::Socket::Option option, int* value)
{
    ASSERT(option < MAX_SOCKET_OPTION);
    int storedValue = m_options[option];
    if (storedValue != -1)
        *value = m_options[option];
    return 0;
}

int LibWebRTCSocket::SetOption(rtc::Socket::Option option, int value)
{
    ASSERT(option < MAX_SOCKET_OPTION);

    m_options[option] = value;

    auto identifier = this->identifier();
    sendOnMainThread([identifier, option, value](IPC::Connection& connection) {
        connection.send(Messages::NetworkRTCSocket::SetOption(option, value), identifier);
    });
    return 0;
}

} // namespace WebKit

#endif // USE(LIBWEBRTC)
