<?php
namespace  includes;

use classes\xmpp;
use classes\webhook;
use config\config;

/**
 * Main Application Class
 * @package Includes
 */
class app
{
    protected $config;

    public function __construct()
    {
        $this->config = new config();
    }

    /**
     * Main application loop
     */
    public function start(): void
    {
        if($this->checkIfRequestMethodIsPost() && $this->checkAuthorization() && $this->checkIfIpOnWhitelistAndWhitelistEnabled())  {
            $this->handleIncomingData();
        }
    }

    /**
     * Check if client is authorized to post via this gate
     * @return bool
     */
    private function checkAuthorization(): ?bool
    {
        if(isset($_GET['apikey']) && $_GET['apikey'] === $this->config->api_key)
        {
            return true;
        }

        die("ERROR: Client not authenticated to use this application");
    }

    /**
     * Check if whitelist and ip address is in whitelist
     */
    private function checkIfIpOnWhitelistAndWhitelistEnabled(): bool
    {
        if($this->config->ip_whitelist)
        {
            if(in_array($this->getRealIPAddr(),$this->config->ips_whitelist_list))
            {
                return true;
            }

            return false;
        }

        return true;
    }
    /**
     * Check if request method is post
     * @return bool
     */
    private function checkIfRequestMethodIsPost(): bool
    {
        if($_SERVER["REQUEST_METHOD"])
        {
            return true;
        }

        return false;
    }


    private function handleIncomingData(): void
    {
        $post = file_get_contents("php://input");
        $comp = $this->checkIfCompatibilityClassNeeded();
        $wh = new Webhook($post,$comp);
        $xmpp = new Xmpp();

        $xmpp->start();
        $xmpp->connect();
        $xmpp->sendMessage($wh->getMessage(),$wh->getEventFilter());
        $xmpp->disconnect();
    }

    private function checkIfCompatibilityClassNeeded()
    {
	$comp = $_GET["comp"] ?? "";
        if(array_key_exists("HTTP_X_GITEA_DELIVERY",$_SERVER) || $comp === "gitea")
        {
            return 'gitea';
        }

        if(isset($_SERVER['User-Agent']) && $_SERVER['User-Agent'] === "Grafana" || $comp === "Grafana")
        {
            return 'grafana';
        }
	
        return false;
    }

    private function getRealIPAddr()
    {
        if (!empty($_SERVER['HTTP_CLIENT_IP']))
        {
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        }

        elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
        {
            $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
        }
        else
        {
            $ip = $_SERVER['REMOTE_ADDR'];
        }

        return $ip;
    }
}