#ifndef TSN_MULTIDROP_CHANNEL_H
#define TSN_MULTIDROP_CHANNEL_H

#include "ns3/channel.h"
#include "ns3/data-rate.h"
#include "ns3/nstime.h"
#include "ns3/ptr.h"
#include "ns3/traced-callback.h"

#include <list>

// Add a doxygen group for this module.
// If you have more than one file, this should be in only one of them.
/**
 * \defgroup ethernet Description of the ethernet
 */

namespace ns3
{

class TsnNetDevice;
class TsnMultidropNetDevice;
class Packet;

  /**
   * \ingroup ethernet
   * \brief Ethernet Multidrop Channel.
   *
   * This class represents a half duplex multidrop Ethernet channel, called
   * 10BASE-T1S, where the collision are avoid using a mechanism called PLCA
   * (Physical Layer Collision Avoidance), implemented in the netDevice.
   * This physical layer is proposed in IEEE 802.3cg-2019.
   *
   */

class TsnMultidropChannel : public Channel
{
  public:
    /**
     * \brief Get the TypeId
     *
     * \return The TypeId for this class
     */
    static TypeId GetTypeId();

    /**
     * \brief Create a TsnMultidropChannel
     *
     * By default, you get a channel that has a 25ns delay no matter
     * the netdevice.
     */
    TsnMultidropChannel();

    /**
     * \brief Attach a given netdevice to this channel
     * \param device pointer to the netdevice to attach to the channel
     */
    void Attach(Ptr<TsnMultidropNetDevice> device);

    /**
     * \brief Transmit a packet over this channel
     * \param p Packet to transmit
     * \param src Source TsnNetDevice
     * \param txTime Transmit time to apply
     * \returns true if successful (currently always true)
     */
    virtual bool TransmitStart(Ptr<const Packet> p, Ptr<TsnNetDevice> src, Time txTime);

    /**
     * \brief Get number of devices on this channel
     * \returns number of devices on this channel
     */
    std::size_t GetNDevices() const override;

    /**
     * \brief Get TsnNetDevice corresponding to index i on this channel
     * \param i Index number of the device requested
     * \returns Ptr to TsnNetDevice requested
     */
    Ptr<TsnNetDevice> GetEthernetDevice(std::size_t i) const;

    /**
     * \brief Get NetDevice corresponding to index i on this channel
     * \param i Index number of the device requested
     * \returns Ptr to NetDevice requested
     */
    Ptr<NetDevice> GetDevice(std::size_t i) const override;

    /**
    *
    */
    void StartBeaconTransmission();

    /**
    *
    */
    void StopBeaconTransmission();

  protected:
    /**
     * \brief Get the delay associated with this channel
     * \returns Time delay
     */
    Time GetDelay() const;

    /**
     * \brief Check to make sure the wire is initialized
     * \returns true if initialized, asserts otherwise
     */
    bool IsInitialized() const;


    /**
     * TracedCallback signature for packet transmission animation events.
     *
     * \param [in] packet The packet being transmitted.
     * \param [in] txDevice the TransmitTing NetDevice.
     * \param [in] rxDevice the Receiving NetDevice.
     * \param [in] duration The amount of time to transmit the packet.
     * \param [in] lastBitTime Last bit receive time (relative to now)
     * \deprecated The non-const \c Ptr<NetDevice> argument is deprecated
     * and will be changed to \c Ptr<const NetDevice> in a future release.
     */
    typedef void (*TxRxAnimationCallback)(Ptr<const Packet> packet,
                                          Ptr<NetDevice> txDevice,
                                          Ptr<NetDevice> rxDevice,
                                          Time duration,
                                          Time lastBitTime);

  private:
    std::vector<Ptr<TsnMultidropNetDevice>> m_netDevices;

    Time m_delay;           //!< Propagation delay

    /**
     * The trace source for the packet transmission animation events that the
     * device can fire.
     * Arguments to the callback are the packet, transmitting
     * net device, receiving net device, transmission time and
     * packet receipt time.
     *
     * \see class CallBackTraceSource
     * \deprecated The non-const \c Ptr<NetDevice> argument is deprecated
     * and will be changed to \c Ptr<const NetDevice> in a future release.
     */
    TracedCallback<Ptr<const Packet>, // Packet being transmitted
                   Ptr<NetDevice>,    // Transmitting NetDevice
                   Ptr<NetDevice>,    // Receiving NetDevice
                   Time,              // Amount of time to transmit the pkt
                   Time               // Last bit receive time (relative to now)
                   >
        m_txrxEthernet;

    /** \brief Wire states
     *
     */
    enum WireState
    {
        /** Initializing state */
        INITIALIZING,
        /** Idle state (no transmission from NetDevice) */
        IDLE,
        /** Transmitting state (data being transmitted from NetDevice. */
        TRANSMITTING,
        /** Propagating state (data is being propagated in the channel. */
        PROPAGATING
    };

    WireState m_wireState = INITIALIZING;
};

}

#endif /* TSN_MULTIDROP_CHANNEL_H */