<?php
/**
 * This file is part of GameQ.
 *
 * GameQ is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GameQ 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace GameQ\Protocols;

use GameQ\Protocol;
use GameQ\Buffer;
use GameQ\Result;
use GameQ\Exception\Protocol as Exception;

/**
 * Battlefield Bad Company 2 Protocol Class
 *
 * NOTE:  There are no qualifiers to the response packets sent back from the server as to which response packet
 * belongs to which query request.  For now this class assumes the responses are in the same order as the order in
 * which the packets were sent to the server.  If this assumption turns out to be wrong there is easy way to tell which
 * response belongs to which query.  Hopefully this assumption will hold true as it has in my testing.
 *
 * @package GameQ\Protocols
 * @author  Austin Bischoff <austin@codebeard.com>
 */
class Bfbc2 extends Protocol
{

    /**
     * Array of packets we want to query.
     *
     * @type array
     */
    protected $packets = [
        self::PACKET_VERSION => "\x00\x00\x00\x00\x18\x00\x00\x00\x01\x00\x00\x00\x07\x00\x00\x00version\x00",
        self::PACKET_STATUS  => "\x00\x00\x00\x00\x1b\x00\x00\x00\x01\x00\x00\x00\x0a\x00\x00\x00serverInfo\x00",
        self::PACKET_PLAYERS => "\x00\x00\x00\x00\x24\x00\x00\x00\x02\x00\x00\x00\x0b\x00\x00\x00listPlayers\x00\x03\x00\x00\x00\x61ll\x00",
    ];

    /**
     * Use the response flag to figure out what method to run
     *
     * @type array
     */
    protected $responses = [
        "processVersion",
        "processDetails",
        "processPlayers",
    ];

    /**
     * The transport mode for this protocol is TCP
     *
     * @type string
     */
    protected $transport = self::TRANSPORT_TCP;

    /**
     * The query protocol used to make the call
     *
     * @type string
     */
    protected $protocol = 'bfbc2';

    /**
     * String name of this protocol class
     *
     * @type string
     */
    protected $name = 'bfbc2';

    /**
     * Longer string name of this protocol class
     *
     * @type string
     */
    protected $name_long = "Battlefield Bad Company 2";

    /**
     * The client join link
     *
     * @type string
     */
    protected $join_link = null;

    /**
     * query_port = client_port + 29321
     * 48888 = 19567 + 29321
     *
     * @type int
     */
    protected $port_diff = 29321;

    /**
     * Normalize settings for this protocol
     *
     * @type array
     */
    protected $normalize = [
        // General
        'general' => [
            // target       => source
            'dedicated'  => 'dedicated',
            'hostname'   => 'hostname',
            'mapname'    => 'map',
            'maxplayers' => 'max_players',
            'numplayers' => 'num_players',
            'password'   => 'password',
        ],
        'player'  => [
            'name'  => 'name',
            'score' => 'score',
            'ping'  => 'ping',
        ],
        'team'    => [
            'score' => 'tickets',
        ],
    ];

    /**
     * Process the response for the StarMade server
     *
     * @return array
     * @throws \GameQ\Exception\Protocol
     */
    public function processResponse()
    {

        //print_r($this->packets_response);

        // Holds the results sent back
        $results = [];

        // Iterate over the response packets
        // @todo: This protocol has no packet ordering, ids or anyway to identify which packet coming back belongs to which initial call.
        foreach ($this->packets_response as $i => $packet) {
            // Create a new buffer
            $buffer = new Buffer($packet);

            // Burn first 4 bytes, same across all packets
            $buffer->skip(4);

            // Get the packet length
            $packetLength = $buffer->getLength();

            // Check to make sure the expected length matches the real length
            // Subtract 4 for the header burn
            if ($packetLength != ($buffer->readInt32() - 4)) {
                throw new Exception(__METHOD__ . " packet length does not match expected length!");
            }

            // We assume the packets are coming back in the same order as sent, this maybe incorrect...
            $results = array_merge(
                $results,
                call_user_func_array([$this, $this->responses[$i]], [$buffer])
            );
        }

        unset($buffer, $packetLength);

        return $results;
    }

    /*
     * Internal Methods
     */

    /**
     * Decode the buffer into a usable format
     *
     * @param \GameQ\Buffer $buffer
     *
     * @return array
     */
    protected function decode(Buffer $buffer)
    {

        $items = [];

        // Get the number of words in this buffer
        $itemCount = $buffer->readInt32();

        // Loop over the number of items
        for ($i = 0; $i < $itemCount; $i++) {
            // Length of the string
            $buffer->readInt32();

            // Just read the string
            $items[$i] = $buffer->readString();
        }

        return $items;
    }

    /**
     * Process the server details
     *
     * @param \GameQ\Buffer $buffer
     *
     * @return array
     */
    protected function processDetails(Buffer $buffer)
    {

        // Decode into items
        $items = $this->decode($buffer);

        // Set the result to a new result instance
        $result = new Result();

        // Server is always dedicated
        $result->add('dedicated', 1);

        // These are the same no matter what mode the server is in
        $result->add('hostname', $items[1]);
        $result->add('num_players', (int)$items[2]);
        $result->add('max_players', (int)$items[3]);
        $result->add('gametype', $items[4]);
        $result->add('map', $items[5]);
        $result->add('roundsplayed', (int)$items[6]);
        $result->add('roundstotal', (int)$items[7]);
        $result->add('num_teams', (int)$items[8]);

        // Set the current index
        $index_current = 9;

        // Pull the team count
        $teamCount = $result->get('num_teams');

        // Loop for the number of teams found, increment along the way
        for ($id = 1; $id <= $teamCount; $id++, $index_current++) {
            // Shows the tickets
            $result->addTeam('tickets', $items[$index_current]);
            // We add an id so we know which team this is
            $result->addTeam('id', $id);
        }

        // Get and set the rest of the data points.
        $result->add('targetscore', (int)$items[$index_current]);
        $result->add('online', 1); // Forced true, shows accepting players
        $result->add('ranked', (($items[$index_current + 2] == 'true') ? 1 : 0));
        $result->add('punkbuster', (($items[$index_current + 3] == 'true') ? 1 : 0));
        $result->add('password', (($items[$index_current + 4] == 'true') ? 1 : 0));
        $result->add('uptime', (int)$items[$index_current + 5]);
        $result->add('roundtime', (int)$items[$index_current + 6]);
        $result->add('mod', $items[$index_current + 7]);

        $result->add('ip_port', $items[$index_current + 9]);
        $result->add('punkbuster_version', $items[$index_current + 10]);
        $result->add('join_queue', (($items[$index_current + 11] == 'true') ? 1 : 0));
        $result->add('region', $items[$index_current + 12]);

        unset($items, $index_current, $teamCount, $buffer);

        return $result->fetch();
    }

    /**
     * Process the server version
     *
     * @param \GameQ\Buffer $buffer
     *
     * @return array
     */
    protected function processVersion(Buffer $buffer)
    {
        // Decode into items
        $items = $this->decode($buffer);

        // Set the result to a new result instance
        $result = new Result();

        $result->add('version', $items[2]);

        unset($buffer, $items);

        return $result->fetch();
    }

    /**
     * Process the players
     *
     * @param \GameQ\Buffer $buffer
     *
     * @return array
     */
    protected function processPlayers(Buffer $buffer)
    {

        // Decode into items
        $items = $this->decode($buffer);

        // Set the result to a new result instance
        $result = new Result();

        // Number of data points per player
        $numTags = $items[1];

        // Grab the tags for each player
        $tags = array_slice($items, 2, $numTags);

        // Get the player count
        $playerCount = $items[$numTags + 2];

        // Iterate over the index until we run out of players
        for ($i = 0, $x = $numTags + 3; $i < $playerCount; $i++, $x += $numTags) {
            // Loop over the player tags and extract the info for that tag
            foreach ($tags as $index => $tag) {
                $result->addPlayer($tag, $items[($x + $index)]);
            }
        }

        return $result->fetch();
    }
}