/* DHT boostrap
 *
 * A simple DHT boostrap server for tox.
 *
 *  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/>.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "../toxcore/DHT.h"
#include "../toxcore/LAN_discovery.h"
#include "../toxcore/friend_requests.h"
#include "../toxcore/util.h"

#include "../testing/misc_tools.c"

/* Sleep function (x = milliseconds) */
#ifdef WIN32
#define c_sleep(x) Sleep(1*x)
#else
#include <unistd.h>
#include <arpa/inet.h>
#define c_sleep(x) usleep(1000*x)
#endif

#define PORT 33445



void manage_keys(DHT *dht)
{
    const uint32_t KEYS_SIZE = crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
    uint8_t keys[KEYS_SIZE];

    FILE *keys_file = fopen("key", "r");

    if (keys_file != NULL) {
        /* If file was opened successfully -- load keys,
           otherwise save new keys */
        size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);

        if (read_size != KEYS_SIZE) {
            printf("Error while reading the key file\nExiting.\n");
            exit(1);
        }

        load_keys(dht->c, keys);
        printf("Keys loaded successfully.\n");
    } else {
        new_keys(dht->c);
        save_keys(dht->c, keys);
        keys_file = fopen("key", "w");

        if (fwrite(keys, sizeof(uint8_t), KEYS_SIZE, keys_file) != KEYS_SIZE) {
            printf("Error while writing the key file.\nExiting.\n");
            exit(1);
        }

        printf("Keys saved successfully.\n");
    }

    fclose(keys_file);
}

int main(int argc, char *argv[])
{
    if (argc == 2 && !strncasecmp(argv[1], "-h", 3)) {
        printf("Usage (connected)  : %s [--ipv4|--ipv6] IP PORT KEY\n", argv[0]);
        printf("Usage (unconnected): %s [--ipv4|--ipv6]\n", argv[0]);
        exit(0);
    }

    /* let user override default by cmdline */
    uint8_t ipv6enabled = TOX_ENABLE_IPV6_DEFAULT; /* x */
    int argvoffset = cmdline_parsefor_ipv46(argc, argv, &ipv6enabled);

    if (argvoffset < 0)
        exit(1);

    /* Initialize networking -
       Bind to ip 0.0.0.0 / [::] : PORT */
    IP ip;
    ip_init(&ip, ipv6enabled);

    DHT *dht = new_DHT(new_net_crypto(new_networking(ip, PORT)));
    Onion *onion = new_onion(dht);
    Onion_Announce *onion_a = new_onion_announce(dht);

    if (!(onion && onion_a)) {
        printf("Something failed to initialize.\n");
        exit(1);
    }
    perror("Initialization");

    manage_keys(dht);
    /* We want our DHT public key to be the same as our internal one since this is a bootstrap server */
    memcpy(dht->self_public_key, dht->c->self_public_key, crypto_box_PUBLICKEYBYTES);
    memcpy(dht->self_secret_key, dht->c->self_secret_key, crypto_box_SECRETKEYBYTES);
    printf("Public key: ");
    uint32_t i;

    FILE *file;
    file = fopen("PUBLIC_ID.txt", "w");

    for (i = 0; i < 32; i++) {
        if (dht->c->self_public_key[i] < 16)
            printf("0");

        printf("%hhX", dht->c->self_public_key[i]);
        fprintf(file, "%hhX", dht->c->self_public_key[i]);
    }

    fclose(file);

    printf("\n");
    printf("Port: %u\n", ntohs(dht->c->lossless_udp->net->port));

    if (argc > argvoffset + 3) {
        printf("Trying to bootstrap into the network...\n");
        uint16_t port = htons(atoi(argv[argvoffset + 2]));
        uint8_t *bootstrap_key = hex_string_to_bin(argv[argvoffset + 3]);
        int res = DHT_bootstrap_from_address(dht, argv[argvoffset + 1],
                                             ipv6enabled, port, bootstrap_key);
        free(bootstrap_key);

        if (!res) {
            printf("Failed to convert \"%s\" into an IP address. Exiting...\n", argv[argvoffset + 1]);
            exit(1);
        }
    }

    int is_waiting_for_dht_connection = 1;

    uint64_t last_LANdiscovery = 0;
    LANdiscovery_init(dht);

    while (1) {
        if (is_waiting_for_dht_connection && DHT_isconnected(dht)) {
            printf("Connected to other bootstrap server successfully.\n");
            is_waiting_for_dht_connection = 0;
        }

        do_DHT(dht);

        if (is_timeout(last_LANdiscovery, is_waiting_for_dht_connection ? 5 : LAN_DISCOVERY_INTERVAL)) {
            send_LANdiscovery(htons(PORT), dht);
            last_LANdiscovery = unix_time();
        }

        networking_poll(dht->c->lossless_udp->net);

        c_sleep(1);
    }

    return 0;
}