/* Messenger.h
*
* An implementation of a simple text chat only messenger on the tox network core.
*
* NOTE: All the text in the messages must be encoded using UTF-8
 
    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 MESSENGER_H
#define MESSENGER_H

#include "net_crypto.h"
#include "DHT.h"

#define MAX_NAME_LENGTH 128
#define MAX_USERSTATUS_LENGTH 128
// don't assume MAX_USERSTATUS_LENGTH will stay at 128, it may be increased
// to an absurdly large number later

//add a friend
//set the data that will be sent along with friend request
//client_id is the client id of the friend
//data is the data and length is the length
//returns the friend number if success
//return -1 if failure.
int m_addfriend(uint8_t * client_id, uint8_t * data, uint16_t length);


//add a friend without sending a friendrequest.
//returns the friend number if success
//return -1 if failure.
int m_addfriend_norequest(uint8_t * client_id);

//return the friend id associated to that client id.
//return -1 if no such friend
int getfriend_id(uint8_t * client_id);

//copies the public key associated to that friend id into client_id buffer.
//make sure that client_id is of size CLIENT_ID_SIZE.
//returns 0 if success
//return -1 if failure.
int getclient_id(int friend_id, uint8_t * client_id);

//remove a friend
int m_delfriend(int friendnumber);

//return 4 if friend is online
//return 3 if friend is confirmed
//return 2 if the friend request was sent
//return 1 if the friend was added
//return 0 if there is no friend with that number.
int m_friendstatus(int friendnumber);


//send a text chat message to an online friend.
//returns 1 if packet was successfully put into the send queue
//return 0 if it was not.
int m_sendmessage(int friendnumber, uint8_t * message, uint32_t length);

//Set our nickname
//name must be a string of maximum MAX_NAME_LENGTH length.
//return 0 if success
//return -1 if failure
int setname(uint8_t * name, uint16_t length);


//get name of friendnumber
//put it in name
//name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH (128) bytes.
//return 0 if success
//return -1 if failure
int getname(int friendnumber, uint8_t * name);

// set our user status
// you are responsible for freeing status after
// returns 0 on success, -1 on failure
int m_set_userstatus(uint8_t *status, uint16_t length);

// return the length of friendnumber's user status,
// including null
// pass it into malloc
int m_get_userstatus_size(int friendnumber);

// copy friendnumber's userstatus into buf, truncating if size is over maxlen
// get the size you need to allocate from m_get_userstatus_size
int m_copy_userstatus(int friendnumber, uint8_t * buf, uint32_t maxlen);

//set the function that will be executed when a friend request is received.
//function format is function(uint8_t * public_key, uint8_t * data, uint16_t length)
void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t));


//set the function that will be executed when a message from a friend is received.
//function format is: function(int friendnumber, uint8_t * message, uint32_t length)
void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t));

// set the callback for name changes
// function(int friendnumber, uint8_t *newname, uint16_t length)
// you are not responsible for freeing newname
void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t));

// set the callback for user status changes
// function(int friendnumber, uint8_t *newstatus, uint16_t length)
// you are not responsible for freeing newstatus
void m_callback_userstatus(void (*function)(int, uint8_t *, uint16_t));

//run this at startup
void initMessenger();


//the main loop that needs to be run at least 200 times per second.
void doMessenger();


//SAVING AND LOADING FUNCTIONS:

//returns the size of the messenger data (for saving)
uint32_t Messenger_size();

//save the messenger in data (must be allocated memory of size Messenger_size())
void Messenger_save(uint8_t * data);

//load the messenger from data of size length.
int Messenger_load(uint8_t * data, uint32_t length);

#endif