/*
 * Copyright (c) 2010 University of Washington
 *
 * SPDX-License-Identifier: GPL-2.0-only
 */

#include "trace-helper.h"

#include "ns3/abort.h"
#include "ns3/assert.h"
#include "ns3/log.h"
#include "ns3/names.h"
#include "ns3/net-device.h"
#include "ns3/node.h"
#include "ns3/pcap-file-wrapper.h"
#include "ns3/ptr.h"

#include <cstdint>
#include <fstream>
#include <string>

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("TraceHelper");

PcapHelper::PcapHelper()
{
    NS_LOG_FUNCTION_NOARGS();
}

PcapHelper::~PcapHelper()
{
    NS_LOG_FUNCTION_NOARGS();
}

Ptr<PcapFileWrapper>
PcapHelper::CreateFile(std::string filename,
                       std::ios::openmode filemode,
                       DataLinkType dataLinkType,
                       uint32_t snapLen,
                       int32_t tzCorrection)
{
    NS_LOG_FUNCTION(filename << filemode << dataLinkType << snapLen << tzCorrection);

    Ptr<PcapFileWrapper> file = CreateObject<PcapFileWrapper>();
    file->Open(filename, filemode);
    NS_ABORT_MSG_IF(file->Fail(), "Unable to Open " << filename << " for mode " << filemode);

    file->Init(dataLinkType, snapLen, tzCorrection);
    NS_ABORT_MSG_IF(file->Fail(), "Unable to Init " << filename);

    //
    // Note that the pcap helper promptly forgets all about the pcap file.  We
    // rely on the reference count of the file object which will soon be owned
    // by the caller to keep the object alive.  If the caller uses the file
    // object to hook a trace source, ownership of the file object will be
    // implicitly transferred to the callback which keeps the object alive.
    // When the callback is destroyed (when either the trace is disconnected or
    // the object with the trace source is deleted) the callback will be destroyed
    // and the file object will be destroyed, releasing the pointer and closing
    // the file.
    //
    return file;
}

std::string
PcapHelper::GetFilenameFromDevice(std::string prefix, Ptr<NetDevice> device, bool useObjectNames)
{
    NS_LOG_FUNCTION(prefix << device << useObjectNames);
    NS_ABORT_MSG_UNLESS(!prefix.empty(), "Empty prefix string");

    std::ostringstream oss;
    oss << prefix << "-";

    std::string nodename;
    std::string devicename;

    Ptr<Node> node = device->GetNode();

    if (useObjectNames)
    {
        nodename = Names::FindName(node);
        devicename = Names::FindName(device);
    }

    if (!nodename.empty())
    {
        oss << nodename;
    }
    else
    {
        oss << node->GetId();
    }

    oss << "-";

    if (!devicename.empty())
    {
        oss << devicename;
    }
    else
    {
        oss << device->GetIfIndex();
    }

    oss << ".pcap";

    return oss.str();
}

std::string
PcapHelper::GetFilenameFromInterfacePair(std::string prefix,
                                         Ptr<Object> object,
                                         uint32_t interface,
                                         bool useObjectNames)
{
    NS_LOG_FUNCTION(prefix << object << interface << useObjectNames);
    NS_ABORT_MSG_UNLESS(!prefix.empty(), "Empty prefix string");

    std::ostringstream oss;
    oss << prefix << "-";

    std::string objname;
    std::string nodename;

    Ptr<Node> node = object->GetObject<Node>();

    if (useObjectNames)
    {
        objname = Names::FindName(object);
        nodename = Names::FindName(node);
    }

    if (!objname.empty())
    {
        oss << objname;
    }
    else if (!nodename.empty())
    {
        oss << nodename;
    }
    else
    {
        oss << "n" << node->GetId();
    }

    oss << "-i" << interface << ".pcap";

    return oss.str();
}

//
// The basic default trace sink.  This one just writes the packet to the pcap
// file which is good enough for most kinds of captures.
//
void
PcapHelper::DefaultSink(Ptr<PcapFileWrapper> file, Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(file << p);
    file->Write(Simulator::Now(), p);
}

void
PcapHelper::SinkWithHeader(Ptr<PcapFileWrapper> file, const Header& header, Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(file << p);
    file->Write(Simulator::Now(), header, p);
}

AsciiTraceHelper::AsciiTraceHelper()
{
    NS_LOG_FUNCTION_NOARGS();
}

AsciiTraceHelper::~AsciiTraceHelper()
{
    NS_LOG_FUNCTION_NOARGS();
}

Ptr<OutputStreamWrapper>
AsciiTraceHelper::CreateFileStream(std::string filename, std::ios::openmode filemode)
{
    NS_LOG_FUNCTION(filename << filemode);

    Ptr<OutputStreamWrapper> StreamWrapper = Create<OutputStreamWrapper>(filename, filemode);

    //
    // Note that the ascii trace helper promptly forgets all about the trace file.
    // We rely on the reference count of the file object which will soon be owned
    // by the caller to keep the object alive.  If the caller uses the stream
    // object to hook a trace source, ownership of the stream object will be
    // implicitly transferred to the callback which keeps the object alive.
    // When the callback is destroyed (when either the trace is disconnected or
    // the object with the trace source is deleted) the callback will be destroyed
    // and the stream object will be destroyed, releasing the pointer and closing
    // the underlying file.
    //
    return StreamWrapper;
}

std::string
AsciiTraceHelper::GetFilenameFromDevice(std::string prefix,
                                        Ptr<NetDevice> device,
                                        bool useObjectNames)
{
    NS_LOG_FUNCTION(prefix << device << useObjectNames);
    NS_ABORT_MSG_UNLESS(!prefix.empty(), "Empty prefix string");

    std::ostringstream oss;
    oss << prefix << "-";

    std::string nodename;
    std::string devicename;

    Ptr<Node> node = device->GetNode();

    if (useObjectNames)
    {
        nodename = Names::FindName(node);
        devicename = Names::FindName(device);
    }

    if (!nodename.empty())
    {
        oss << nodename;
    }
    else
    {
        oss << node->GetId();
    }

    oss << "-";

    if (!devicename.empty())
    {
        oss << devicename;
    }
    else
    {
        oss << device->GetIfIndex();
    }

    oss << ".tr";

    return oss.str();
}

std::string
AsciiTraceHelper::GetFilenameFromInterfacePair(std::string prefix,
                                               Ptr<Object> object,
                                               uint32_t interface,
                                               bool useObjectNames)
{
    NS_LOG_FUNCTION(prefix << object << interface << useObjectNames);
    NS_ABORT_MSG_UNLESS(!prefix.empty(), "Empty prefix string");

    std::ostringstream oss;
    oss << prefix << "-";

    std::string objname;
    std::string nodename;

    Ptr<Node> node = object->GetObject<Node>();

    if (useObjectNames)
    {
        objname = Names::FindName(object);
        nodename = Names::FindName(node);
    }

    if (!objname.empty())
    {
        oss << objname;
    }
    else if (!nodename.empty())
    {
        oss << nodename;
    }
    else
    {
        oss << "n" << node->GetId();
    }

    oss << "-i" << interface << ".tr";

    return oss.str();
}

//
// One of the basic default trace sink sets.  Enqueue:
//
//   When a packet has been sent to a device for transmission, the device is
//   expected to place the packet onto a transmit queue even if it does not
//   have to delay the packet at all, if only to trigger this event.  This
//   event will eventually translate into a '+' operation in the trace file.
//
//   This is typically implemented by hooking the "TxQueue/Enqueue" trace hook
//   in the device (actually the Queue in the device).
//
void
AsciiTraceHelper::DefaultEnqueueSinkWithoutContext(Ptr<OutputStreamWrapper> stream,
                                                   Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "+ " << Simulator::Now().GetSeconds() << " " << *p << std::endl;
}

void
AsciiTraceHelper::DefaultEnqueueSinkWithContext(Ptr<OutputStreamWrapper> stream,
                                                std::string context,
                                                Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "+ " << Simulator::Now().GetSeconds() << " " << context << " " << *p
                         << std::endl;
}

//
// One of the basic default trace sink sets.  Drop:
//
//   When a packet has been sent to a device for transmission, the device is
//   expected to place the packet onto a transmit queue.  If this queue is
//   full the packet will be dropped.  The device is expected to trigger an
//   event to indicate that an outbound packet is being dropped.  This event
//   will eventually translate into a 'd' operation in the trace file.
//
//   This is typically implemented by hooking the "TxQueue/Drop" trace hook
//   in the device (actually the Queue in the device).
//
void
AsciiTraceHelper::DefaultDropSinkWithoutContext(Ptr<OutputStreamWrapper> stream,
                                                Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "d " << Simulator::Now().GetSeconds() << " " << *p << std::endl;
}

void
AsciiTraceHelper::DefaultDropSinkWithContext(Ptr<OutputStreamWrapper> stream,
                                             std::string context,
                                             Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "d " << Simulator::Now().GetSeconds() << " " << context << " " << *p
                         << std::endl;
}

//
// One of the basic default trace sink sets.  Dequeue:
//
//   When a packet has been sent to a device for transmission, the device is
//   expected to place the packet onto a transmit queue even if it does not
//   have to delay the packet at all.  The device removes the packet from the
//   transmit queue when the packet is ready to send, and this dequeue will
//   fire a corresponding event.  This event will eventually translate into a
//   '-' operation in the trace file.
//
//   This is typically implemented by hooking the "TxQueue/Dequeue" trace hook
//   in the device (actually the Queue in the device).
//
void
AsciiTraceHelper::DefaultDequeueSinkWithoutContext(Ptr<OutputStreamWrapper> stream,
                                                   Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "- " << Simulator::Now().GetSeconds() << " " << *p << std::endl;
}

void
AsciiTraceHelper::DefaultDequeueSinkWithContext(Ptr<OutputStreamWrapper> stream,
                                                std::string context,
                                                Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "- " << Simulator::Now().GetSeconds() << " " << context << " " << *p
                         << std::endl;
}

//
// One of the basic default trace sink sets.  Receive:
//
//   When a packet is received by a device for transmission, the device is
//   expected to trigger this event to indicate the reception has occurred.
//   This event will eventually translate into an 'r' operation in the trace
//   file.
//
//   This is typically implemented by hooking the "MacRx" trace hook in the
//   device.
void
AsciiTraceHelper::DefaultReceiveSinkWithoutContext(Ptr<OutputStreamWrapper> stream,
                                                   Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "r " << Simulator::Now().GetSeconds() << " " << *p << std::endl;
}

void
AsciiTraceHelper::DefaultReceiveSinkWithContext(Ptr<OutputStreamWrapper> stream,
                                                std::string context,
                                                Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(stream << p);
    *stream->GetStream() << "r " << Simulator::Now().GetSeconds() << " " << context << " " << *p
                         << std::endl;
}

void
PcapHelperForDevice::EnablePcap(std::string prefix,
                                Ptr<NetDevice> nd,
                                bool promiscuous,
                                bool explicitFilename)
{
    EnablePcapInternal(prefix, nd, promiscuous, explicitFilename);
}

void
PcapHelperForDevice::EnablePcap(std::string prefix,
                                std::string ndName,
                                bool promiscuous,
                                bool explicitFilename)
{
    Ptr<NetDevice> nd = Names::Find<NetDevice>(ndName);
    EnablePcap(prefix, nd, promiscuous, explicitFilename);
}

void
PcapHelperForDevice::EnablePcap(std::string prefix, NetDeviceContainer d, bool promiscuous)
{
    for (auto i = d.Begin(); i != d.End(); ++i)
    {
        Ptr<NetDevice> dev = *i;
        EnablePcap(prefix, dev, promiscuous);
    }
}

void
PcapHelperForDevice::EnablePcap(std::string prefix, NodeContainer n, bool promiscuous)
{
    NetDeviceContainer devs;
    for (auto i = n.Begin(); i != n.End(); ++i)
    {
        Ptr<Node> node = *i;
        for (uint32_t j = 0; j < node->GetNDevices(); ++j)
        {
            devs.Add(node->GetDevice(j));
        }
    }
    EnablePcap(prefix, devs, promiscuous);
}

void
PcapHelperForDevice::EnablePcapAll(std::string prefix, bool promiscuous)
{
    EnablePcap(prefix, NodeContainer::GetGlobal(), promiscuous);
}

void
PcapHelperForDevice::EnablePcap(std::string prefix,
                                uint32_t nodeid,
                                uint32_t deviceid,
                                bool promiscuous)
{
    NodeContainer n = NodeContainer::GetGlobal();

    for (auto i = n.Begin(); i != n.End(); ++i)
    {
        Ptr<Node> node = *i;
        if (node->GetId() != nodeid)
        {
            continue;
        }

        NS_ABORT_MSG_IF(deviceid >= node->GetNDevices(),
                        "PcapHelperForDevice::EnablePcap(): Unknown deviceid = " << deviceid);
        Ptr<NetDevice> nd = node->GetDevice(deviceid);
        EnablePcap(prefix, nd, promiscuous);
        return;
    }
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(std::string prefix, Ptr<NetDevice> nd, bool explicitFilename)
{
    EnableAsciiInternal(Ptr<OutputStreamWrapper>(), prefix, nd, explicitFilename);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(Ptr<OutputStreamWrapper> stream, Ptr<NetDevice> nd)
{
    EnableAsciiInternal(stream, std::string(), nd, false);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(std::string prefix,
                                       std::string ndName,
                                       bool explicitFilename)
{
    EnableAsciiImpl(Ptr<OutputStreamWrapper>(), prefix, ndName, explicitFilename);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(Ptr<OutputStreamWrapper> stream, std::string ndName)
{
    EnableAsciiImpl(stream, std::string(), ndName, false);
}

//
// Private API
//
void
AsciiTraceHelperForDevice::EnableAsciiImpl(Ptr<OutputStreamWrapper> stream,
                                           std::string prefix,
                                           std::string ndName,
                                           bool explicitFilename)
{
    Ptr<NetDevice> nd = Names::Find<NetDevice>(ndName);
    EnableAsciiInternal(stream, prefix, nd, explicitFilename);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(std::string prefix, NetDeviceContainer d)
{
    EnableAsciiImpl(Ptr<OutputStreamWrapper>(), prefix, d);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(Ptr<OutputStreamWrapper> stream, NetDeviceContainer d)
{
    EnableAsciiImpl(stream, std::string(), d);
}

//
// Private API
//
void
AsciiTraceHelperForDevice::EnableAsciiImpl(Ptr<OutputStreamWrapper> stream,
                                           std::string prefix,
                                           NetDeviceContainer d)
{
    for (auto i = d.Begin(); i != d.End(); ++i)
    {
        Ptr<NetDevice> dev = *i;
        EnableAsciiInternal(stream, prefix, dev, false);
    }
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(std::string prefix, NodeContainer n)
{
    EnableAsciiImpl(Ptr<OutputStreamWrapper>(), prefix, n);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(Ptr<OutputStreamWrapper> stream, NodeContainer n)
{
    EnableAsciiImpl(stream, std::string(), n);
}

//
// Private API
//
void
AsciiTraceHelperForDevice::EnableAsciiImpl(Ptr<OutputStreamWrapper> stream,
                                           std::string prefix,
                                           NodeContainer n)
{
    NetDeviceContainer devs;
    for (auto i = n.Begin(); i != n.End(); ++i)
    {
        Ptr<Node> node = *i;
        for (uint32_t j = 0; j < node->GetNDevices(); ++j)
        {
            devs.Add(node->GetDevice(j));
        }
    }
    EnableAsciiImpl(stream, prefix, devs);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAsciiAll(std::string prefix)
{
    EnableAsciiImpl(Ptr<OutputStreamWrapper>(), prefix, NodeContainer::GetGlobal());
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAsciiAll(Ptr<OutputStreamWrapper> stream)
{
    EnableAsciiImpl(stream, std::string(), NodeContainer::GetGlobal());
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(Ptr<OutputStreamWrapper> stream,
                                       uint32_t nodeid,
                                       uint32_t deviceid)
{
    EnableAsciiImpl(stream, std::string(), nodeid, deviceid, false);
}

//
// Public API
//
void
AsciiTraceHelperForDevice::EnableAscii(std::string prefix,
                                       uint32_t nodeid,
                                       uint32_t deviceid,
                                       bool explicitFilename)
{
    EnableAsciiImpl(Ptr<OutputStreamWrapper>(), prefix, nodeid, deviceid, explicitFilename);
}

//
// Private API
//
void
AsciiTraceHelperForDevice::EnableAsciiImpl(Ptr<OutputStreamWrapper> stream,
                                           std::string prefix,
                                           uint32_t nodeid,
                                           uint32_t deviceid,
                                           bool explicitFilename)
{
    NodeContainer n = NodeContainer::GetGlobal();

    for (auto i = n.Begin(); i != n.End(); ++i)
    {
        Ptr<Node> node = *i;
        if (node->GetId() != nodeid)
        {
            continue;
        }

        NS_ABORT_MSG_IF(
            deviceid >= node->GetNDevices(),
            "AsciiTraceHelperForDevice::EnableAscii(): Unknown deviceid = " << deviceid);

        Ptr<NetDevice> nd = node->GetDevice(deviceid);

        EnableAsciiInternal(stream, prefix, nd, explicitFilename);
        return;
    }
}

} // namespace ns3
