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<?php

/**
 * Copyright 2017 MICRORISC s.r.o.
 * Copyright 2017 IQRF Tech s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

declare(strict_types=1);

namespace App\IqrfAppModule\Model;

use Nette;

/**
 * Parser for DPA Coordinator responses.
 */
class CoordinatorParser {

    use Nette\SmartObject;

    /**
     * Parse DPA Coordinator response
     * @param string $packet DPA packet
     * @return array
     */
    public function parse(string $packet) {
        $pcmd = explode('.', $packet)[3];
        switch ($pcmd) {
            case '81':
                return $this->parseGetNodes($packet);
            case '82':
                return $this->parseGetNodes($packet);
        }
    }

    /**
     * Parse response to DPA Coordinator - "Get bonded nodes" and "Get discovered nodes" request
     * @param string $packet DPA packet response
     * @return array Bonded XOR discovered nodes
     */
    public function parseGetNodes(string $packet) {
        $data = [];
        $packetArray = explode('.', $packet);
        $pcmd = $packetArray[3];
        if ($pcmd === '81') {
            $type = 'DiscoveredNodes';
        } elseif ($pcmd === '82') {
            $type = 'BondedNodes';
        }
        for ($i = 0; $i < 30; $i += 2) {
            $data[$type][$i / 2] = str_split(str_pad(strrev(base_convert($packetArray[9 + $i] . $packetArray[8 + $i], 16, 2)), 16, '0'));
        }
        return $data;
    }

}