/* DHT.h
* 
* An implementation of the DHT as seen in docs/DHT.txt
* 
 
    Copyright (C) 2013 Tox project All Rights Reserved.

    This file is part of Tox.

    Tox is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Tox is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Tox.  If not, see <http://www.gnu.org/licenses/>.
    
*/


#ifndef DHT_H 
#define DHT_H 

#include "net_crypto.h"

//Current time, unix format
#define unix_time() ((uint32_t)time(NULL))

//size of the client_id in bytes
#define CLIENT_ID_SIZE crypto_box_PUBLICKEYBYTES



//Add a new friend to the friends list
//client_id must be CLIENT_ID_SIZE bytes long.
//returns 0 if success
//returns 1 if failure (friends list is full)
int DHT_addfriend(uint8_t * client_id);

//Delete a friend from the friends list
//client_id must be CLIENT_ID_SIZE bytes long.
//returns 0 if success
//returns 1 if failure (client_id not in friends list)
int DHT_delfriend(uint8_t * client_id);


//Get ip of friend
//client_id must be CLIENT_ID_SIZE bytes long.
//ip must be 4 bytes long.
//port must be 2 bytes long.
//returns ip if success
//returns ip of 0 if failure (This means the friend is either offline or we have not found him yet.)
//returns ip of 1 if friend is not in list.
IP_Port DHT_getfriendip(uint8_t * client_id);


//Run this function at least a couple times per second (It's the main loop)
void doDHT();

//if we receive a DHT packet we call this function so it can be handled.
//Return 0 if packet is handled correctly.
//return 1 if it didn't handle the packet or if the packet was shit.
int DHT_handlepacket(uint8_t * packet, uint32_t length, IP_Port source);

//Use this function to bootstrap the client
//Sends a get nodes request to the given node with ip port and public_key
void DHT_bootstrap(IP_Port ip_port, uint8_t * public_key);


//TODO:
//Add functions to save and load the state(client list, friends list)





#endif