/*
 * Handle friend requests.
 */

/*
 * Copyright © 2016-2017 The TokTok team.
 * Copyright © 2014 Tox project.
 *
 * This file is part of Tox, the free peer to peer instant messenger.
 *
 * 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 FRIEND_REQUESTS_H
#define FRIEND_REQUESTS_H

#include "friend_connection.h"

#define MAX_FRIEND_REQUEST_DATA_SIZE (ONION_CLIENT_MAX_DATA_SIZE - (1 + sizeof(uint32_t)))

typedef struct {
    uint32_t nospam;
    void (*handle_friendrequest)(void *, const uint8_t *, const uint8_t *, size_t, void *);
    uint8_t handle_friendrequest_isset;
    void *handle_friendrequest_object;

    int (*filter_function)(const uint8_t *, void *);
    void *filter_function_userdata;
    /* NOTE: The following is just a temporary fix for the multiple friend requests received at the same time problem.
     * TODO(irungentoo): Make this better (This will most likely tie in with the way we will handle spam.)
     */

#define MAX_RECEIVED_STORED 32

    uint8_t received_requests[MAX_RECEIVED_STORED][CRYPTO_PUBLIC_KEY_SIZE];
    uint16_t received_requests_index;
} Friend_Requests;

/* Set and get the nospam variable used to prevent one type of friend request spam. */
void set_nospam(Friend_Requests *fr, uint32_t num);
uint32_t get_nospam(const Friend_Requests *fr);

/* Remove real_pk from received_requests list.
 *
 *  return 0 if it removed it successfully.
 *  return -1 if it didn't find it.
 */
int remove_request_received(Friend_Requests *fr, const uint8_t *real_pk);

/* Set the function that will be executed when a friend request for us is received.
 *  Function format is function(uint8_t * public_key, uint8_t * data, size_t length, void * userdata)
 */
void callback_friendrequest(Friend_Requests *fr, void (*function)(void *, const uint8_t *, const uint8_t *, size_t,
                            void *), void *object);

/* Set the function used to check if a friend request should be displayed to the user or not.
 * Function format is int function(uint8_t * public_key, void * userdata)
 * It must return 0 if the request is ok (anything else if it is bad.)
 */
void set_filter_function(Friend_Requests *fr, int (*function)(const uint8_t *, void *), void *userdata);

/* Sets up friendreq packet handlers. */
void friendreq_init(Friend_Requests *fr, Friend_Connections *fr_c);


#endif