#include "switch-channel.h"

#include "ns3/log.h"

/**
 * \file
 * \ingroup ethernet
 * ns3::SwitchChannel implementation.
 */

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("SwitchChannel");

NS_OBJECT_ENSURE_REGISTERED(SwitchChannel);

TypeId
SwitchChannel::GetTypeId()
{
    static TypeId tid = TypeId("ns3::SwitchChannel")
                            .SetParent<Channel>()
                            .SetGroupName("Ethernet")
                            .AddConstructor<SwitchChannel>();
    return tid;
}

SwitchChannel::SwitchChannel()
    : Channel()
{
    NS_LOG_FUNCTION_NOARGS();
}

SwitchChannel::~SwitchChannel()
{
    NS_LOG_FUNCTION_NOARGS();

    for (auto iter = m_switchedChannels.begin(); iter != m_switchedChannels.end(); iter++)
    {
        *iter = nullptr;
    }
    m_switchedChannels.clear();
}

void
SwitchChannel::AddChannel(Ptr<Channel> switchedChannel)
{
    m_switchedChannels.push_back(switchedChannel);
}

std::size_t
SwitchChannel::GetNDevices() const
{
    uint32_t ndevices = 0;
    for (auto iter = m_switchedChannels.begin(); iter != m_switchedChannels.end(); iter++)
    {
        ndevices += (*iter)->GetNDevices();
    }
    return ndevices;
}

Ptr<NetDevice>
SwitchChannel::GetDevice(std::size_t i) const
{
    std::size_t ndevices = 0;
    for (auto iter = m_switchedChannels.begin(); iter != m_switchedChannels.end(); iter++)
    {
        if ((i - ndevices) < (*iter)->GetNDevices())
        {
            return (*iter)->GetDevice(i - ndevices);
        }
        ndevices += (*iter)->GetNDevices();
    }
    return nullptr;
}

} // namespace ns3