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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\ConfigModule\Model;

use App\Model\JsonFileManager;
use Nette;
use Nette\Utils\ArrayHash;

class InstanceManager {

    use Nette\SmartObject;

    /**
     * @var JsonFileManager
     */
    private $fileManager;

    /**
     *
     * @var string File name (without .json)
     */
    private $fileName;

    /**
     * Constructor
     * @param JsonFileManager $fileManager
     */
    public function __construct(JsonFileManager $fileManager) {
        $this->fileManager = $fileManager;
    }

    /**
     * Add new Instance
     * @param ArrayHash $array Instance's settings
     */
    public function add(ArrayHash $array) {
        $id = count($this->getInstances());
        $this->save($array, $id);
    }

    /**
     * Delete Instance setting
     * @param int $id Instance ID
     */
    public function delete(int $id) {
        $json = $this->fileManager->read($this->fileName);
        unset($json['Instances'][$id]);
        $json['Instances'] = array_values($json['Instances']);
        $this->fileManager->write($this->fileName, $json);
    }

    /**
     * Get list of Instances
     * @return array Instances
     */
    public function getInstances() {
        $json = $this->fileManager->read($this->fileName);
        return $json['Instances'];
    }

    /**
     * Convert Instances configuration form array to JSON array
     * @param int $id Interface ID
     * @return array Array for form
     */
    public function load(int $id = 0) {
        $json = $this->fileManager->read($this->fileName);
        $instances = $json['Instances'];
        if ($id >= count($instances)) {
            return [];
        }
        $data = $instances[$id];
        $instance = $data['Properties'];
        $instance['Name'] = $data['Name'];
        $instance['Enabled'] = $data['Enabled'];
        return $instance;
    }

    /**
     * Save Instances setting
     * @param ArrayHash $array Instance settings
     * @param int $id Instance ID
     */
    public function save(ArrayHash $array, int $id = 0) {
        $json = $this->fileManager->read($this->fileName);
        $json['Instances'] = $this->saveJson($json['Instances'], $array, $id);
        $this->fileManager->write($this->fileName, $json);
    }

    /**
     * Convert array from Interfaces configuration form to JSON
     * @param array $instances Original Instances JSON array
     * @param ArrayHash $update Changed settings
     * @param int $id Interface ID
     * @return array JSON array
     */
    public function saveJson(array $instances, ArrayHash $update, int $id) {
        $instance = [];
        $instance['Name'] = $update['Name'];
        $instance['Enabled'] = $update['Enabled'];
        unset($update['Name'], $update['Enabled']);
        $instance['Properties'] = (array) $update;
        $instances[$id] = $instance;
        return $instances;
    }

    /**
     * Set file name
     * @param string $fileName File name (without .json)
     */
    public function setFileName(string $fileName) {
        $this->fileName = $fileName;
    }

}