<?php
namespace Uiharu;

use stdClass;
use Index\MediaType;
use Index\Performance\Stopwatch;

require_once __DIR__ . '/../uiharu.php';

define('UIH_CACHE',       !UIH_DEBUG || isset($_GET['_cache']));
define('UIH_INCLUDE_RAW', UIH_DEBUG || isset($_GET['include_raw']));

function uih_media_type_json(MediaType $mediaType): array {
    $parts = [
        'string' => (string)$mediaType,
        'type' => $mediaType->getCategory(),
        'subtype' => $mediaType->getKind(),
    ];

    if(!empty($suffix = $mediaType->getSuffix()))
        $parts['suffix'] = $suffix;

    if(!empty($params = $mediaType->getParams()))
        $parts['params'] = $params;

    return $parts;
}

function uih_parse_url(string $url): array|false {
    $parts = parse_url($url);
    if($parts === false)
        return false;

    // v1 compat
    $parts['uri'] = uih_build_url($parts);
    if(isset($parts['pass']))
        $parts['password'] = $parts['pass'];

    return $parts;
}

function uih_build_url(array $parts): string {
    $string = '';

    if(!empty($parts['scheme']))
        $string .= $parts['scheme'] . ':';

    $authority = '';

    if(isset($parts['user']) || isset($parts['pass'])) {
        if(isset($parts['user']))
            $authority .= $parts['user'];
        if(isset($parts['pass']))
            $authority .= ':' . $parts['pass'];
        $authority .= '@';
    }

    if(isset($parts['host'])) {
        $authority .= $parts['host'];
        if(isset($parts['port']))
            $authority .= ':' . $parts['port'];
    }

    $hasAuthority = !empty($authority);
    if($hasAuthority)
        $string .= '//' . $authority;

    $path = $parts['path'] ?? '';
    $hasPath = !empty($path);

    if($hasAuthority && (!$hasPath || $path[0] !== '/'))
        $string .= '/';
    elseif(!$hasAuthority && $path[1] === '/')
        $path = '/' . trim($path, '/');

    $string .= $path;

    if(!empty($parts['query'])) {
        $string .= '?';
        $queryParts = explode('&', $parts['query']);

        foreach($queryParts as $queryPart) {
            $kvp = explode('=', $queryPart, 2);
            $string .= rawurlencode($kvp[0]);
            if(isset($kvp[1]))
                $string .= '=' . rawurlencode($kvp[1]);
            $string .= '&';
        }

        $string = substr($string, 0, -1);
    }

    if(!empty($parts['fragment']))
        $string .= '#' . rawurlencode($parts['fragment']);

    return $string;
}

function uih_eeprom_lookup(stdClass $resp, string $eepromFileId, string $domain = 'flashii'): void {
    $resp->type = 'eeprom:file';
    $resp->color = '#8559a5';
    $resp->eeprom_file_id = $eepromFileId;
    $curl = curl_init("https://eeprom.{$domain}.net/uploads/{$resp->eeprom_file_id}.json");
    curl_setopt_array($curl, [
        CURLOPT_AUTOREFERER => false,
        CURLOPT_CERTINFO => false,
        CURLOPT_FAILONERROR => false,
        CURLOPT_FOLLOWLOCATION => false,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TCP_FASTOPEN => true,
        CURLOPT_CONNECTTIMEOUT => 2,
        CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
        CURLOPT_TIMEOUT => 5,
        CURLOPT_USERAGENT => 'Uiharu/' . UIH_VERSION,
        CURLOPT_HTTPHEADER => [
            'Accept: application/json',
        ],
    ]);
    $eepromResp = curl_exec($curl);
    curl_close($curl);
    $resp->eeprom_file_info = json_decode($eepromResp);
    if(isset($resp->eeprom_file_info->name))
        $resp->title = $resp->eeprom_file_info->name;
    if(isset($resp->eeprom_file_info->thumb))
        $resp->image = $resp->eeprom_file_info->thumb;
    $resp->site_name = 'Flashii EEPROM';
}

if(!is_dir(UIH_SEM_PATH))
    mkdir(UIH_SEM_PATH, 0777, true);

header('X-Powered-By: Uiharu');

$db->execute('DELETE FROM `uih_metadata_cache` WHERE `metadata_created` < NOW() - INTERVAL 7 DAY');

$reqMethod =                      filter_input(INPUT_SERVER, 'REQUEST_METHOD');
$reqPath   = '/' . trim(parse_url(filter_input(INPUT_SERVER, 'REQUEST_URI'), PHP_URL_PATH), '/');
$reqHead   = false;

if($reqMethod == 'HEAD') {
    $reqMethod = 'GET';
    $reqHead = true;
}

if(!empty($_SERVER['HTTP_ORIGIN'])) {
    $originLast12 = substr($_SERVER['HTTP_ORIGIN'], -12, 12);
    $originLast10 = substr($_SERVER['HTTP_ORIGIN'], -10, 10);
    if($originLast12 !== '/flashii.net' && $originLast12 !== '.flashii.net'
        && $originLast10 !== '/edgii.net' && $originLast10 !== '.edgii.net'
        && $_SERVER['HTTP_ORIGIN'] !== 'https://flashii.net'
        && $_SERVER['HTTP_ORIGIN'] !== 'http://flashii.net'
        && $_SERVER['HTTP_ORIGIN'] !== 'https://edgii.net'
        && $_SERVER['HTTP_ORIGIN'] !== 'http://edgii.net') {
        http_response_code(403);
        return;
    }

    header('Access-Control-Allow-Origin: ' . $_SERVER['HTTP_ORIGIN']);
    header('Vary: Origin');
}

if($reqMethod === 'OPTIONS') {
    http_response_code(204);
    //header('Access-Control-Allow-Credentials: true');
    //header('Access-Control-Allow-Headers: Authorization');
    header('Access-Control-Allow-Methods: OPTIONS, GET, POST');
    return;
}

if($reqPath === '/metadata') {
    // Allow using POST for ridiculous urls.
    if($reqMethod !== 'GET' && $reqMethod !== 'POST') {
        http_response_code(405);
        return;
    }

    header('Content-Type: application/json; charset=utf-8');
    if($reqHead)
        return;

    $sw = Stopwatch::startNew();
    $resp = new stdClass;

    if($_SERVER['HTTP_HOST'] === 'mii.flashii.net') {
        $resp->type = 'object';
        $resp->content_type = [];
        $resp->content_type['string'] = 'application/x-update-your-script-to-use-uiharu.flashii.net-instead-of-mii.flashii.net';
        $resp->content_type['type'] = 'text';
        $resp->content_type['subtype'] = 'deprecation';
        $resp->title = 'Update your URLs: mii.flashii.net -> uiharu.flashii.net';
        $resp->description = 'Update your URLs: mii.flashii.net -> uiharu.flashii.net';
        $resp->site_name = 'Deprecation notice';
        $resp->took = 35.1;
        echo json_encode($resp);
        return;
    }

    if($reqMethod === 'POST') {
        $targetUrl = substr((string)file_get_contents('php://input'), 0, 1000);
    } else {
        $targetUrl = (string)filter_input(INPUT_GET, 'url');
    }

    $parsedUrl = uih_parse_url($targetUrl);
    if($parsedUrl === false) {
        http_response_code(400);
        $resp->error = 'metadata:uri';
        echo json_encode($resp);
        return;
    }

    $resp->uri = $parsedUrl;

    // if no scheme is specified, try https
    if(empty($parsedUrl['scheme'])) {
        $parsedUrl['scheme'] = 'https';
        $parsedUrl = uih_parse_url(uih_build_url($parsedUrl));
    }

    $urlHash = hash('sha256', uih_build_url($parsedUrl));

    try {
        $semPath = UIH_SEM_PATH . DIRECTORY_SEPARATOR . $urlHash;
        if(!is_file($semPath))
            touch($semPath);
        $ftok = ftok($semPath, UIH_SEM_NAME);
        $semaphore = sem_get($ftok, 1);
        while(!sem_acquire($semaphore)) usleep(100);

        if(UIH_CACHE) {
            $cacheFetch = $db->prepare('SELECT `metadata_resp` FROM `uih_metadata_cache` WHERE `metadata_url` = UNHEX(?) AND `metadata_created` > NOW() - INTERVAL 10 MINUTE');
            $cacheFetch->addParameter(1, $urlHash);
            $cacheFetch->execute();
            $cacheResult = $cacheFetch->getResult();
            if($cacheResult->next()) {
                $cacheResp = json_decode($cacheResult->getString(0));
                if($cacheResp !== null)
                    $resp = $cacheResp;
            }
        }

        if(empty($resp->type)) {
            $urlScheme = strtolower($parsedUrl['scheme']);
            $urlHost = strtolower($parsedUrl['host']);
            $urlPath = '/' . trim($parsedUrl['path'], '/');

            if($urlScheme === 'eeprom') {
                if(preg_match('#^([A-Za-z0-9-_]+)$#', $parsedUrl['path'], $matches)) {
                    $resp->uri = $parsedUrl = uih_parse_url('https://i.fii.moe/' . $matches[1]);
                    $continueRaw = true;
                    uih_eeprom_lookup($resp, $matches[1]);
                }
            } elseif($urlScheme === 'devrom') {
                if(preg_match('#^([A-Za-z0-9-_]+)$#', $parsedUrl['path'], $matches)) {
                    $resp->uri = $parsedUrl = uih_parse_url('https://i.edgii.net/' . $matches[1]);
                    $continueRaw = true;
                    uih_eeprom_lookup($resp, $matches[1], 'edgii');
                }
            } elseif($urlScheme === 'http' || $urlScheme === 'https') {
                switch($urlHost) {
                    case 'i.flashii.net':
                    case 'i.fii.moe':
                        $eepromFileId = substr($urlPath, 1);
                    case 'eeprom.flashii.net':
                        if(!isset($eepromFileId) && preg_match('#^/uploads/([A-Za-z0-9-_]+)/?$#', $urlPath, $matches))
                            $eepromFileId = $matches[1];

                        if(!empty($eepromFileId)) {
                            $continueRaw = true;
                            uih_eeprom_lookup($resp, $eepromFileId);
                        }
                        break;

                    case 'i.edgii.net':
                        $eepromFileId = substr($urlPath, 1);
                    case 'eeprom.edgii.net':
                        if(!isset($eepromFileId) && preg_match('#^/uploads/([A-Za-z0-9-_]+)/?$#', $urlPath, $matches))
                            $eepromFileId = $matches[1];

                        if(!empty($eepromFileId)) {
                            $continueRaw = true;
                            uih_eeprom_lookup($resp, $eepromFileId, 'edgii');
                        }
                        break;

                    case 'twitter.com':   case 'www.twitter.com':
                    case 'm.twitter.com': case 'mobile.twitter.com':
                    case 'nitter.net':    case 'www.nitter.net':
                        if(preg_match('#^/@?(?:[A-Za-z0-9_]{1,20})/status(?:es)?/([0-9]+)/?$#', $urlPath, $matches)) {
                            $resp->type = 'twitter:tweet';
                            $resp->color = '#1da1f2';
                            $resp->tweet_id = strval($matches[1] ?? '0');
                            $curl = curl_init("https://api.twitter.com/2/tweets?ids={$resp->tweet_id}&expansions=attachments.media_keys,author_id,entities.mentions.username,referenced_tweets.id,referenced_tweets.id.author_id&media.fields=height,width,media_key,preview_image_url,url,type&tweet.fields=attachments,conversation_id,text,source,possibly_sensitive,created_at&user.fields=id,name,profile_image_url,protected,username,verified");
                            curl_setopt_array($curl, [
                                CURLOPT_AUTOREFERER => false,
                                CURLOPT_CERTINFO => false,
                                CURLOPT_FAILONERROR => false,
                                CURLOPT_FOLLOWLOCATION => false,
                                CURLOPT_RETURNTRANSFER => true,
                                CURLOPT_TCP_FASTOPEN => true,
                                CURLOPT_CONNECTTIMEOUT => 2,
                                CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
                                CURLOPT_TIMEOUT => 5,
                                CURLOPT_USERAGENT => 'Uiharu/' . UIH_VERSION,
                                CURLOPT_HTTPHEADER => [
                                    'Authorization: Bearer ' . Config::get('Twitter', 'apiToken'),
                                    'Accept: application/json',
                                ],
                            ]);
                            $tweetResp = curl_exec($curl);
                            curl_close($curl);
                            $resp->tweet_info = json_decode($tweetResp);
                            if(isset($resp->tweet_info->includes->users[0]->name))
                                $resp->title = $resp->tweet_info->includes->users[0]->name;
                            if(isset($resp->tweet_info->includes->users[0]->profile_image_url))
                                $resp->image = $resp->tweet_info->includes->users[0]->profile_image_url;
                            if(isset($resp->tweet_info->data[0]->text))
                                $resp->description = $resp->tweet_info->data[0]->text;
                            $resp->site_name = 'Twitter';
                            break;
                        }

                        if(preg_match('#^/@?([A-Za-z0-9_]{1,20})/?$#', $urlPath, $matches)) {
                            $resp->type = 'twitter:user';
                            $resp->color = '#1da1f2';
                            $resp->twitter_user_name = strval($matches[1] ?? '');
                            $curl = curl_init("https://api.twitter.com/2/users/by?usernames={$resp->twitter_user_name}&user.fields=description,entities,id,name,profile_image_url,protected,url,username,verified");
                            curl_setopt_array($curl, [
                                CURLOPT_AUTOREFERER => false,
                                CURLOPT_CERTINFO => false,
                                CURLOPT_FAILONERROR => false,
                                CURLOPT_FOLLOWLOCATION => false,
                                CURLOPT_RETURNTRANSFER => true,
                                CURLOPT_TCP_FASTOPEN => true,
                                CURLOPT_CONNECTTIMEOUT => 2,
                                CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
                                CURLOPT_TIMEOUT => 5,
                                CURLOPT_USERAGENT => 'Uiharu/' . UIH_VERSION,
                                CURLOPT_HTTPHEADER => [
                                    'Authorization: Bearer ' . Config::get('Twitter', 'apiToken'),
                                    'Accept: application/json',
                                ],
                            ]);
                            $twitUserResp = curl_exec($curl);
                            curl_close($curl);
                            $resp->twitter_user_info = json_decode($twitUserResp);
                            if(isset($resp->twitter_user_info->data[0]->name))
                                $resp->title = $resp->twitter_user_info->data[0]->name;
                            if(isset($resp->twitter_user_info->data[0]->profile_image_url))
                                $resp->image = $resp->twitter_user_info->data[0]->profile_image_url;
                            if(isset($resp->twitter_user_info->data[0]->description))
                                $resp->description = $resp->twitter_user_info->data[0]->description;
                            $resp->site_name = 'Twitter';
                            break;
                        }
                        break;

                    case 'youtu.be': case 'www.youtu.be': // www. doesn't work for this, but may as well cover it
                        $youtubeVideoId = substr($urlPath, 1);
                    case 'youtube.com': case 'www.youtube.com':
                    case 'youtube-nocookie.com': case 'www.youtube-nocookie.com':
                        parse_str($parsedUrl['query'], $queryString);

                        if(!isset($youtubeVideoId) && $urlPath === '/watch')
                            $youtubeVideoId = $queryString['v'] ?? null;

                        if(!empty($youtubeVideoId)) {
                            $resp->type = 'youtube:video';
                            $resp->color = '#f00';
                            $resp->youtube_video_id = $youtubeVideoId;

                            if(isset($queryString['t']))
                                $resp->youtube_start_time = $queryString['t'];
                            if(isset($queryString['list']))
                                $resp->youtube_playlist = $queryString['list'];
                            if(isset($queryString['index']))
                                $resp->youtube_playlist_index = $queryString['index'];

                            $curl = curl_init("https://www.googleapis.com/youtube/v3/videos?part=snippet%2CcontentDetails%2Cstatistics&id={$resp->youtube_video_id}&key=" . Config::get('Google', 'apiKey'));
                            curl_setopt_array($curl, [
                                CURLOPT_AUTOREFERER => false,
                                CURLOPT_CERTINFO => false,
                                CURLOPT_FAILONERROR => false,
                                CURLOPT_FOLLOWLOCATION => false,
                                CURLOPT_RETURNTRANSFER => true,
                                CURLOPT_TCP_FASTOPEN => true,
                                CURLOPT_CONNECTTIMEOUT => 2,
                                CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
                                CURLOPT_TIMEOUT => 5,
                                CURLOPT_USERAGENT => 'Uiharu/' . UIH_VERSION,
                                CURLOPT_HTTPHEADER => [
                                    'Accept: application/json',
                                ],
                            ]);
                            $youtubeResp = curl_exec($curl);
                            curl_close($curl);
                            $resp->youtube_video_info = json_decode($youtubeResp);
                            if(isset($resp->youtube_video_info->items[0]->snippet->title))
                                $resp->title = $resp->youtube_video_info->items[0]->snippet->title;
                            if(isset($resp->youtube_video_info->items[0]->snippet->thumbnails->medium->url))
                                $resp->image = $resp->youtube_video_info->items[0]->snippet->thumbnails->medium->url;
                            if(isset($resp->youtube_video_info->items[0]->snippet->description))
                                $resp->description = $resp->youtube_video_info->items[0]->snippet->description;
                            $resp->site_name = 'YouTube';
                        }
                        break;
                }
            } else {
                http_response_code(404);
                $resp->error = 'metadata:scheme';
            }

            if((empty($resp->type) || isset($continueRaw)) && in_array($parsedUrl['scheme'], ['http', 'https'])) {
                $curl = curl_init(uih_build_url($parsedUrl));
                curl_setopt_array($curl, [
                    CURLOPT_AUTOREFERER => true,
                    CURLOPT_CERTINFO => false,
                    CURLOPT_FAILONERROR => false,
                    CURLOPT_FOLLOWLOCATION => true,
                    CURLOPT_MAXREDIRS => 5,
                    CURLOPT_PATH_AS_IS => true,
                    CURLOPT_NOBODY => true,
                    CURLOPT_HEADER => true,
                    CURLOPT_RETURNTRANSFER => true,
                    CURLOPT_TCP_FASTOPEN => true,
                    CURLOPT_CONNECTTIMEOUT => 2,
                    CURLOPT_PROTOCOLS => CURLPROTO_HTTP | CURLPROTO_HTTPS,
                    CURLOPT_REDIR_PROTOCOLS => CURLPROTO_HTTP | CURLPROTO_HTTPS,
                    CURLOPT_TIMEOUT => 5,
                    CURLOPT_DEFAULT_PROTOCOL => 'https',
                    CURLOPT_USERAGENT => 'Mozilla/5.0 (compatible) Uiharu/' . UIH_VERSION,
                    CURLOPT_HTTPHEADER => [
                        'Accept: text/html,application/xhtml+xml',
                    ],
                ]);
                $headers = curl_exec($curl);

                if($headers === false) {
                    $resp->error = 'metadata:timeout';
                    $resp->errorMessage = curl_error($curl);
                } else {
                    $headersRaw = explode("\r\n", trim($headers));
                    $statusCode = 200;
                    $headers = [];
                    foreach($headersRaw as $header) {
                        if(empty($header))
                            continue;
                        if(strpos($header, ':') === false) {
                            $headParts = explode(' ', $header);
                            if(isset($headParts[1]) && is_numeric($headParts[1]))
                                $statusCode = (int)$headParts[1];
                            $headers = [];
                            continue;
                        }
                        $headerParts = explode(':', $header, 2);
                        $headerParts[0] = mb_strtolower($headerParts[0]);
                        if(isset($headers[$headerParts[0]]))
                            $headers[$headerParts[0]] .= ', ' . trim($headerParts[1] ?? '');
                        else
                            $headers[$headerParts[0]] = trim($headerParts[1] ?? '');
                    }

                    try {
                        $contentType = MediaType::parse($headers['content-type'] ?? '');
                    } catch(InvalidArgumentException $ex) {
                        $contentType = MediaType::parse('application/octet-stream');
                    }

                    $resp->content_type = uih_media_type_json($contentType);

                    $isHTML  = $contentType->equals('text/html');
                    $isXHTML = $contentType->equals('application/xhtml+xml');

                    if($isHTML || $isXHTML) {
                        curl_setopt_array($curl, [
                            CURLOPT_NOBODY => false,
                            CURLOPT_HEADER => false,
                        ]);

                        $body = curl_exec($curl);
                        curl_close($curl);

                        $document = new DOMDocument;
                        if($isXHTML) {
                            $document->loadXML($body);
                        } else {
                            @$document->loadHTML('<?xml encoding="' . $contentType->getCharset() . '">' . $body);
                            foreach($document->childNodes as $child)
                                if($child->nodeType === XML_PI_NODE) {
                                    $document->removeChild($child);
                                    break;
                                }
                            $document->encoding = $contentType->getCharset();
                        }

                        $charSet = $document->encoding;

                        $resp->type = 'website';
                        $resp->title = '';

                        $isMetaTitle = false;
                        $titleTag = $document->getElementsByTagName('title');
                        foreach($titleTag as $tag) {
                            $resp->title = trim(mb_convert_encoding($tag->textContent, 'utf-8', $charSet));
                            break;
                        }

                        $metaTags = $document->getElementsByTagName('meta');
                        foreach($metaTags as $tag) {
                            $nameAttr = $tag->hasAttribute('name') ? $tag->getAttribute('name') : (
                                $tag->hasAttribute('property') ? $tag->getAttribute('property') : ''
                            );
                            $valueAttr = $tag->hasAttribute('value') ? $tag->getAttribute('value') : (
                                $tag->hasAttribute('content') ? $tag->getAttribute('content') : ''
                            );
                            $nameAttr  = trim(mb_convert_encoding($nameAttr,  'utf-8', $charSet));
                            $valueAttr = trim(mb_convert_encoding($valueAttr, 'utf-8', $charSet));
                            if(empty($nameAttr) || empty($valueAttr))
                                continue;

                            switch($nameAttr) {
                                case 'og:title':
                                case 'twitter:title':
                                    if(!$isMetaTitle) {
                                        $isMetaTitle = true;
                                        $resp->title = $valueAttr;
                                    }
                                    break;

                                case 'description':
                                case 'og:description':
                                case 'twitter:description':
                                    if(!isset($resp->description))
                                        $resp->description = $valueAttr;
                                    break;

                                case 'og:site_name':
                                    $resp->site_name = $valueAttr;
                                    break;

                                case 'og:image':
                                case 'twitter:image':
                                    $resp->image = $valueAttr;
                                    break;

                                case 'theme-color':
                                    $resp->color = $valueAttr;
                                    break;

                                case 'og:type':
                                    $resp->type = $valueAttr;
                                    break;
                            }
                        }
                    } else {
                        $resp->is_image = $isImage = $contentType->matchCategory('image');
                        $resp->is_audio = $isAudio = $contentType->matchCategory('audio');
                        $resp->is_video = $isVideo = $contentType->matchCategory('video');

                        if($isImage || $isAudio || $isVideo) {
                            curl_close($curl);
                            $resp->media = new stdClass;
                            $ffmpeg = json_decode(shell_exec(sprintf('ffprobe -show_streams -show_format -print_format json -v quiet -i %s', escapeshellarg(uih_build_url($parsedUrl)))));

                            if(!empty($ffmpeg)) {
                                if(!empty($ffmpeg->format)) {
                                    $resp->media->confidence = empty($ffmpeg->format->probe_score) ? 0 : (intval($ffmpeg->format->probe_score) / 100);
                                    if(!empty($ffmpeg->format->duration))
                                        $resp->media->duration = floatval($ffmpeg->format->duration);
                                    if(!empty($ffmpeg->format->size))
                                        $resp->media->size = intval($ffmpeg->format->size);
                                    if(!empty($ffmpeg->format->bit_rate))
                                        $resp->media->bitrate = intval($ffmpeg->format->bit_rate);

                                    if($isVideo || $isImage) {
                                        if(!empty($ffmpeg->streams)) {
                                            foreach($ffmpeg->streams as $stream) {
                                                if(($stream->codec_type ?? null) !== 'video')
                                                    continue;

                                                $resp->width = intval($stream->coded_width ?? $stream->width ?? -1);
                                                $resp->height = intval($stream->coded_height ?? $stream->height ?? -1);

                                                if(!empty($stream->display_aspect_ratio))
                                                    $resp->media->aspect_ratio = $stream->display_aspect_ratio;

                                                if($isImage)
                                                    break;
                                            }
                                        }
                                    }

                                    if($isAudio) {
                                        function eat_tags(stdClass $dest, stdClass $source): void {
                                            if(!empty($source->title) || !empty($source->TITLE))
                                                $dest->title = $source->title ?? $source->TITLE;
                                            if(!empty($source->artist) || !empty($source->ARTIST))
                                                $dest->artist = $source->artist ?? $source->ARTIST;
                                            if(!empty($source->album) || !empty($source->ALBUM))
                                                $dest->album = $source->album ?? $source->ALBUM;
                                            if(!empty($source->date) || !empty($source->DATE))
                                                $dest->date = $source->date ?? $source->DATE;
                                            if(!empty($source->comment) || !empty($source->COMMENT))
                                                $dest->comment = $source->comment ?? $source->COMMENT;
                                            if(!empty($source->genre) || !empty($source->GENRE))
                                                $dest->genre = $source->genre ?? $source->GENRE;
                                        }

                                        if(!empty($ffmpeg->format->tags)) {
                                            $resp->media->tags = new stdClass;
                                            eat_tags($resp->media->tags, $ffmpeg->format->tags);
                                        } elseif(!empty($ffmpeg->streams)) {
                                            // iterate over streams, fuck ogg
                                            $resp->media->tags = new stdClass;
                                            foreach($ffmpeg->streams as $stream) {
                                                if(($stream->codec_type ?? null) === 'audio' && !empty($stream->tags)) {
                                                    eat_tags($resp->media->tags, $stream->tags);
                                                    if(!empty($resp->media->tags))
                                                        break;
                                                }
                                            }
                                        }

                                        if(empty($resp->title)) {
                                            $audioTitle = '';
                                            if(!empty($resp->media->tags->artist))
                                                $audioTitle .= $resp->media->tags->artist . ' - ';
                                            if(!empty($resp->media->tags->title))
                                                $audioTitle .= $resp->media->tags->title;
                                            if(!empty($resp->media->tags->date))
                                                $audioTitle .= ' (' . $resp->media->tags->date . ')';
                                            if(!empty($audioTitle))
                                                $resp->title = $audioTitle;
                                        }

                                        if(empty($resp->description) && !empty($resp->media->tags->comment))
                                            $resp->description = $resp->media->tags->comment;
                                    }
                                }
                            }

                            if(UIH_INCLUDE_RAW)
                                $resp->ffmpeg = $ffmpeg;
                        } else curl_close($curl);
                    }
                }
            }

            $sw->stop();
            $resp->took = $sw->getElapsedTime() / 1000;
            $respJson = json_encode($resp);
            $replaceCache = $db->prepare('REPLACE INTO `uih_metadata_cache` (`metadata_url`, `metadata_resp`) VALUES (UNHEX(?), ?)');
            $replaceCache->addParameter(1, $urlHash);
            $replaceCache->addParameter(2, $respJson);
            $replaceCache->execute();
        }
    } finally {
        if(!empty($semaphore))
            sem_release($semaphore);
        if(is_file($semPath))
            unlink($semPath);
    }

    echo $respJson ?? json_encode($resp);
    return;
}

if($reqPath === '/') {
    if($reqMethod !== 'GET') {
        http_response_code(405);
        return;
    }

    header('Content-Type: text/plain');

    if($reqHead)
        return;

    echo 'Metadata lookup service - OK';
    return;
}

http_response_code(404);