<?php
namespace Szurubooru\Helpers;

class HttpHelper
{
    private $redirected = false;

    public function setResponseCode($code)
    {
        http_response_code($code);
    }

    public function setHeader($key, $value)
    {
        header($key . ': ' . $value);
    }

    public function outputJSON($data)
    {
        $encodedJson = json_encode((array) $data);
        $lastError = json_last_error();
        if ($lastError !== JSON_ERROR_NONE)
            $this->output('Fatal error while encoding JSON: ' . $lastError . PHP_EOL . PHP_EOL . print_r($data, true));
        else
            $this->output($encodedJson);
    }

    public function output($data)
    {
        echo $data;
    }

    public function getRequestHeaders()
    {
        if (function_exists('getallheaders'))
        {
            return getallheaders();
        }
        $result = [];
        foreach ($_SERVER as $key => $value)
        {
            if (substr($key, 0, 5) === "HTTP_")
            {
                $key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
                $result[$key] = $value;
            }
            else
            {
                $result[$key] = $value;
            }
        }
        return $result;
    }

    public function getRequestHeader($key)
    {
        $headers = $this->getRequestHeaders();
        return isset($headers[$key]) ? $headers[$key] : null;
    }

    public function getRequestMethod()
    {
        return $_SERVER['REQUEST_METHOD'];
    }

    public function getRequestUri()
    {
        $requestUri = $_SERVER['REQUEST_URI'];
        $requestUri = preg_replace('/\?.*$/', '', $requestUri);
        return $requestUri;
    }

    public function redirect($destination)
    {
        $this->setResponseCode(307);
        $this->setHeader('Location', $destination);
        $this->redirected = true;
    }

    public function nonCachedRedirect($destination)
    {
        $this->setResponseCode(303);
        $this->setHeader('Location', $destination);
        $this->redirected = true;
    }

    public function isRedirecting()
    {
        return $this->redirected;
    }
}