<?php

namespace ActivityPhp\Server\Http;

use ActivityPhp\Server\Cache\CacheHelper;
use Exception;
use GuzzleHttp\Client;

/**
 * Request handler
 */
class Request
{
    const HTTP_HEADER_ACCEPT = 'application/activity+json,application/ld+json,application/json';

    /** @var string HTTP method */
    protected $method = 'GET';

    /**
     * Allowed HTTP methods
     *
     * @var array
     */
    protected $allowedMethods = [
        'GET', 'POST'
    ];

    /**
     * HTTP client
     *
     * @var \GuzzleHttp\Client
     */
    protected $client;

    /**
     * Set HTTP client
     *
     * @param float|int $timeout
     * @param string $agent
     */
    public function __construct($timeout = 10.0, $agent = '')
    {
        $headers = ['Accept' => self::HTTP_HEADER_ACCEPT];
        if ($agent) {
            $headers['User-Agent'] = $agent;
        }

        $this->client = new Client([
            'timeout' => $timeout,
            'headers' => $headers
        ]);
    }

    /**
     * Set HTTP methods
     *
     * @param string $method
     */
    protected function setMethod(string $method)
    {
        if (in_array($method, $this->allowedMethods)) {
            $this->method = $method;
        }
    }

    /**
     * Get HTTP methods
     *
     * @return string
     */
    protected function getMethod()
    {
        return $this->method;
    }

    /**
     * Execute a GET request
     *
     * @param  string $url
     * @return string
     */
    public function get(string $url)
    {
        if (CacheHelper::has($url)) {
            return CacheHelper::get($url);
        }
        try {
            $content = $this->client->get($url)->getBody()->getContents();
        } catch (\GuzzleHttp\Exception\ClientException $exception) {
            throw new Exception($exception->getMessage());
        }

        CacheHelper::set($url, $content);

        return $content;
    }
}
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