#pragma once

#include <llarp.hpp>
#include <llarp/vpn/platform.hpp>
#include <llarp/util/thread/queue.hpp>
#include <memory>

namespace llarp::apple
{
  struct Context;

  class VPNInterface final : public vpn::NetworkInterface,
                             public std::enable_shared_from_this<VPNInterface>
  {
   public:
    using packet_write_callback = std::function<bool(int af_family, void* data, int size)>;
    using on_readable_callback = std::function<void(VPNInterface&)>;

    explicit VPNInterface(
        Context& ctx,
        packet_write_callback packet_writer,
        on_readable_callback on_readable,
        AbstractRouter* router);

    // Method to call when a packet has arrived to deliver the packet to lokinet
    bool
    OfferReadPacket(const llarp_buffer_t& buf);

    int
    PollFD() const override;

    net::IPPacket
    ReadNextPacket() override;

    bool
    WritePacket(net::IPPacket pkt) override;

    void
    MaybeWakeUpperLayers() const override;

   private:
    // Function for us to call when we have a packet to emit.  Should return true if the packet was
    // handed off to the OS successfully.
    packet_write_callback m_PacketWriter;

    // Called when we are ready to start reading packets
    on_readable_callback m_OnReadable;

    static inline constexpr auto PacketQueueSize = 1024;

    thread::Queue<net::IPPacket> m_ReadQueue{PacketQueueSize};

    AbstractRouter* const _router;
  };

}  // namespace llarp::apple