<?php

/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you 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 Elastic\Apm\Impl;

use Elastic\Apm\Impl\BackendComm\SerializationUtil;
use Elastic\Apm\Impl\Log\LoggableInterface;
use Elastic\Apm\Impl\Log\LoggableTrait;
use Elastic\Apm\Impl\Util\ArrayUtil;

/**
 * Code in this file is part of implementation internals and thus it is not covered by the backward compatibility.
 *
 * @internal
 */
final class Metadata implements SerializableDataInterface, LoggableInterface
{
    use LoggableTrait;

    /**
     * @var ?array<string|bool|int|float|null>
     *
     * @link https://github.com/elastic/apm-server/blob/v7.2.0/docs/spec/metadata.json#L32C10-L32C16
     */
    public $labels = null;

    /**
     * @var ProcessData
     *
     * @link https://github.com/elastic/apm-server/blob/7.0/docs/spec/metadata.json#L22
     * @link https://github.com/elastic/apm-server/blob/7.0/docs/spec/process.json
     */
    public $process;

    /**
     * @var ServiceData
     *
     * @link https://github.com/elastic/apm-server/blob/7.0/docs/spec/metadata.json#L7
     * @link https://github.com/elastic/apm-server/blob/7.0/docs/spec/service.json
     */
    public $service;

    /**
     * @var SystemData
     *
     * @link https://github.com/elastic/apm-server/blob/v7.0.0/docs/spec/metadata.json#L25
     * @link github.com/elastic/apm-server/blob/v7.0.0/docs/spec/system.json
     */
    public $system;

    /** @inheritDoc */
    public function jsonSerialize()
    {
        $result = [];

        if ($this->labels !== null && !ArrayUtil::isEmpty($this->labels)) {
            SerializationUtil::addNameValue('labels', (object)$this->labels, /* ref */ $result);
        }
        SerializationUtil::addNameValue('process', $this->process, /* ref */ $result);
        SerializationUtil::addNameValue('service', $this->service, /* ref */ $result);
        SerializationUtil::addNameValue('system', $this->system, /* ref */ $result);

        return SerializationUtil::postProcessResult($result);
    }
}