#ifndef TLV_H
#define TLV_H

#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <stdint.h>

#define LEN_NEIGHBOUR_REQ 0
#define LEN_NEIGHBOUR 18
#define LEN_NETWORK_HASH 16
#define LEN_NETWORK_STATE_REQ 0
#define LEN_NODE_HASH 26
#define LEN_NODE_STATE_REQ 8
#define MIN_LEN_NODE_STATE 26
#define MAX_LEN_NODE_STATE 218

// 8 octets min (struct pointer 4 octets), 1024 octets max
typedef struct packet {
	unsigned char magic; // 95 (si autre, ignorer)
	unsigned char version; // 1 (si autre, ignorer)
	uint16_t length; // 1020 max
	char body[1020];
} packet;

// 1 octet
typedef struct pad1 {
	unsigned char type;
} pad1;

// 2 octets min, 258 octets max (unsigned char 0 -> 255)
typedef struct padn {
	unsigned char type;
	unsigned char length;
	char mbz[256];
} padn;

// 2 octets
typedef struct neighbour_req {
	unsigned char type;
	unsigned char length;
} neighbour_req;

// 20 octets
typedef struct neighbour {
	unsigned char type;
	unsigned char length;
	struct in6_addr ip;
	int16_t port;
} neighbour;

// 18 octets
typedef struct network_hash {
	unsigned char type;
	unsigned char length;
	unsigned char network_hash[16];
} network_hash;

// 2 octets
typedef struct network_state_req {
	unsigned char type;
	unsigned char length;
} network_state_req;

// 28 octets
typedef struct node_hash {
	unsigned char type;
	unsigned char length;
	uint64_t node_id;
	uint16_t seqno;
	unsigned char node_hash[16];
} node_hash;

// 10 octets
typedef struct node_state_req {
	unsigned char type;
	unsigned char length;
	uint64_t node_id;
} node_state_req;

// 28 octets min, 220 octets max (data 0 -> 192)
typedef struct node_state {
	unsigned char type;
	unsigned char length;
	uint64_t node_id;
	uint16_t seqno;
	unsigned char node_hash[16];
	char data[192];
} node_state;

// 2 octets min, 258 ocets max (unsigned char 0 -> 255)
typedef struct warning {
	unsigned char type;
	unsigned char length;
	char message[256];
} warning;

typedef union tlv {
	pad1 *pad1;
	padn *padn;
	neighbour_req *neighbour_req;
	neighbour *neighbour;
	network_hash *network_hash;
	network_state_req *network_state_req;
	node_hash *node_hash;
	node_state_req *node_state_req;
	node_state *node_state;
	warning *warning;
} tlv;

#include "node.h"
#include "hash.h"

// build specific tlv
int build_pad1(tlv *tlv);
int build_padn(tlv *tlv, size_t len);
int build_neighbour_req(union tlv *tlv);
int build_neighbour(tlv *tlv, struct in6_addr ip, int16_t port);
int build_network_hash(tlv *tlv, list *data_list);
int build_network_state_req(tlv *tlv);
int build_node_hash(tlv *tlv, uint64_t node_id, uint16_t seqno, char *data, unsigned char length);
int build_node_state_req(tlv *tlv, uint64_t node_id);
int build_node_state(tlv *tlv, uint64_t node_id, uint16_t seqno, char *data, size_t data_len);
int build_warning(tlv *tlv, char *message, size_t message_len);

#endif