#pragma once
#include <cstdint>
#include <functional>
#include <span>
#include "eth.h"
#include "ipv4.h"
#include "span_writer.h"

namespace icmp {

struct __attribute__((packed)) echo {
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
    uint16_t id;
    uint16_t seq;
};
static_assert(sizeof(echo) == 8);

void handle(std::span<const uint8_t> frame, span_writer& tx,
            eth::mac_addr our_mac, ipv4::ip4_addr our_ip,
            std::function<void(std::span<const uint8_t>)> send_raw);

size_t build_echo_request(std::span<uint8_t> buf,
                          eth::mac_addr src_mac, ipv4::ip4_addr src_ip,
                          eth::mac_addr dst_mac, ipv4::ip4_addr dst_ip,
                          uint16_t id, uint16_t seq);

bool parse_echo_reply(std::span<const uint8_t> frame, ipv4::ip4_addr& src_ip, uint16_t expected_id);

} // namespace icmp