<?php
if($_SERVER['REQUEST_METHOD'] !== 'GET') {
    http_response_code(405);
    header('Content-Type: text/plain');
    echo 'Unsupported request method.';
    return;
}

$reqPath = '/' . trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/');

if($_SERVER['HTTP_HOST'] !== 'ip.flash.moe') {
    $address = $_SERVER['REMOTE_ADDR'];
    $version = (int)substr($_SERVER['HTTP_HOST'], 3, 1);
    $packed  = bin2hex(inet_pton($address));

    if($reqPath === '/json') {
        header('Access-Control-Allow-Origin: *');
        header('Cache-Control: no-cache');
        header('Content-Type: application/json; charset=utf-8');
        echo json_encode([
            'a' => $address,
            'h' => $packed,
            'v' => $version,
        ]);
        return;
    }

    if($reqPath === '/xml') {
        header('Access-Control-Allow-Origin: *');
        header('Cache-Control: no-cache');
        header('Content-Type: application/xml; charset=utf-8');
        $document = new DOMDocument('1.0', 'utf-8');
        $root = $document->appendChild(new DOMElement('IPAddress'));
        $root->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
        $root->setAttribute('xmlns:xsd', 'http://www.w3.org/2001/XMLSchema');

        $root->setAttribute('version', $version);
        $root->setAttribute('packed', $packed);
        $root->appendChild(new DOMText($address));

        echo $document->saveXML();
        return;
    }

    if($reqPath === '/packed') {
        header('Access-Control-Allow-Origin: *');
        header('Cache-Control: no-cache');
        header('Content-Type: text/plain');
        echo $packed;
        return;
    }

    if($reqPath === '/') {
        header('Access-Control-Allow-Origin: *');
        header('Cache-Control: no-cache');
        header('Content-Type: text/plain');
        echo $address;
        return;
    }
} else {
    if($reqPath === '/style.css') {
        header('Content-Type: text/css; charset=utf-8');
        echo file_get_contents(__DIR__ . '/../style.css');
        return;
    }

    if($reqPath === '/script.js') {
        header('Content-Type: application/javascript; charset=utf-8');
        echo file_get_contents(__DIR__ . '/../script.js');
        return;
    }

    if($reqPath === '/') {
        header('Content-Type: text/html; charset=utf-8');
        echo file_get_contents(__DIR__ . '/../index.html');
        return;
    }
}

http_response_code(404);
header('Content-Type: text/plain');
echo 'Path not found.';