#ifndef COPPINO_IPV6_H
#define COPPINO_IPV6_H

namespace ipv6 {

  const uint8_t LEN = 128;
  const uint8_t ICMP_ECHO_REQUEST_TYPE = 128;
  const uint8_t ICMP_ECHO_REPLY_TYPE   = 129;

  const uint8_t NH_ICMP = 58;
  const uint8_t NH_UDP  = 17;

  class IPv6Addr {
    private:
      char address[16];
    public:
      IPv6Addr();
      IPv6Addr(const char* address);
      void deserialize(const char* address);
      const char* serialize();
  };

  extern const IPv6Addr ALL_NODES_ADDRESS;

  struct ipv6_packet_header {
    char field[4];
    char len[2];
    char next_header;
    char hop_limit;
    IPv6Addr src_addr;
    IPv6Addr dst_addr;
  }__attribute__((packed));

  class IPv6Packet {
    private:
      char packet[LEN];
    public:
      void setSrcAddress(IPv6Addr& address);
      void setDstAddress(IPv6Addr& address);
      void setNextHeader(uint8_t next_header);
      void setPayload(char* payload, int len);
      
      char* serialize();
      void deserialize(const char*, int len);

      void doAction();
  };

  /* Note: content of message may be changed */
  void handleICMP(const char* src, const char* dst, char* message, int len);

  uint16_t compute_checksum(const char* src_addr, const char* dst_addr, uint8_t next_header, const char* payload, int len);
}

#endif