<?php
define('FTM_ROOT', __DIR__ . '/..');
define('FTM_HASH', 'xxh3');
define('FTM_PATH_PUB', FTM_ROOT . '/public');
define('FTM_PATH_PRV', FTM_ROOT . '/private');

define('FTM_COMMON_CONFIG', FTM_PATH_PRV . '/common.ini');
define('FTM_SOUND_LIBRARY', FTM_PATH_PRV . '/sound-library.ini');
define('FTM_SOUND_PACKS', FTM_PATH_PRV . '/sound-packs.ini');
define('FTM_TEXT_TRIGGERS', FTM_PATH_PRV . '/text-triggers.ini');

define('FTM_LEGACY_SOUND_TYPE', [
    'opus' => 'audio/ogg',
    'ogg' => 'audio/ogg',
    'mp3' => 'audio/mpeg',
    'caf' => 'audio/x-caf',
    'wav' => 'audio/wav',
]);

define('FTM_FILE_HASH_MAP', [
    'common' => [FTM_COMMON_CONFIG],
    'sounds' => [FTM_SOUND_LIBRARY, FTM_SOUND_PACKS],
    'sounds2' => [FTM_SOUND_LIBRARY, FTM_SOUND_PACKS],
    'texttriggers' => [FTM_TEXT_TRIGGERS],
    'soundtriggers' => [FTM_TEXT_TRIGGERS],
]);

header('X-Powered-By: Futami');
header('Cache-Control: max-age=86400, must-revalidate');
header('Access-Control-Allow-Origin: *');

$reqMethod = (string)filter_input(INPUT_SERVER, 'REQUEST_METHOD');
if($reqMethod === 'OPTIONS') {
    http_response_code(204);
    header('Access-Control-Allow-Methods: OPTIONS, GET');
    header('Access-Control-Allow-Headers: Cache-Control');
    return;
}

if($reqMethod !== 'HEAD' && $reqMethod !== 'GET') {
    http_response_code(405);
    return;
}

function json_out($data): void {
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode($data);
    exit;
}

function ftm_hash_str(string $data): string {
    return hash(FTM_HASH, $data);
}
function ftm_hash_file(string $path): string {
    return hash_file(FTM_HASH, $path);
}
function hash_mapped_file(string $name): string {
    $files = FTM_FILE_HASH_MAP[$name] ?? [];
    if(count($files) === 1)
        return ftm_hash_file($files[0]);

    $data = '';
    foreach($files as $file)
        $data .= file_get_contents($file);

    return ftm_hash_str($data);
}

function match_etag($eTag): void {
    if(filter_input(INPUT_SERVER, 'HTTP_IF_NONE_MATCH') === $eTag) {
        http_response_code(304);
        exit;
    }
}
function gen_etag(string $user, string $data): string {
    return sprintf('W/"%s-%s"', ftm_hash_str($data), $user);
}
function gen_etag_file(string $user, string $path): string {
    return gen_etag($user, ftm_hash_file($path));
}
function etag(string $etag): void {
    match_etag($etag);
    header('ETag: ' . $etag);
}
function etag_data(string $user, string $data): void {
    etag(gen_etag($user, $data));
}
function etag_file(string $user, string $path): void {
    etag(gen_etag_file($user, $path));
}

$reqPath = '/' . trim(parse_url((string)filter_input(INPUT_SERVER, 'REQUEST_URI'), PHP_URL_PATH), '/');

if($reqPath === '/common.json') {
    etag_file('common', FTM_COMMON_CONFIG);

    $config = parse_ini_file(FTM_COMMON_CONFIG, false, INI_SCANNER_TYPED);
    $common = new stdClass;

    foreach($config as $key => $value) {
        if($key === 'colours') {
            $dict = $value;
            $value = [];
            foreach($dict as $name => $raw)
                $value[] = ['n' => $name, 'c' => $raw];
        } elseif(is_string($value) && str_starts_with($value, '::')) {
            $parts = explode(':', substr($value, 2));
            $hash = hash_mapped_file($parts[0]);
            $value = sprintf($parts[1], $hash);
        }

        $common->{$key} = $value;
    }

    json_out($common);
}

if(preg_match('#^/sounds2(\.[a-f0-9]{8})?.json$#', $reqPath)) {
    $sndLibData = file_get_contents(FTM_SOUND_LIBRARY);
    $sndPackData = file_get_contents(FTM_SOUND_PACKS);

    etag_data('sounds2', $sndLibData . $sndPackData);

    $sndLib = parse_ini_string($sndLibData, true, INI_SCANNER_TYPED);
    $sndPacks = parse_ini_string($sndPackData, true, INI_SCANNER_TYPED);

    $library = [];
    foreach($sndLib as $name => $info)
        $library[] = [
            'name' => $name,
            'title' => $info['title'],
            'sources' => $info['sources'],
        ];

    $packs = [];
    foreach($sndPacks as $name => $info)
        $packs[] = [
            'name' => $name,
            'title' => $info['title'],
            'events' => $info['events'],
        ];

    json_out(compact('library', 'packs'));
}

if(preg_match('#^/sounds(\.[a-f0-9]{8})?.json$#', $reqPath)) {
    $sndLibData = file_get_contents(FTM_SOUND_LIBRARY);
    $sndPackData = file_get_contents(FTM_SOUND_PACKS);

    etag_data('sounds', $sndLibData . $sndPackData);

    $sndLib = parse_ini_string($sndLibData, true, INI_SCANNER_TYPED);
    $sndPacks = parse_ini_string($sndPackData, true, INI_SCANNER_TYPED);

    $library = [];
    foreach($sndLib as $name => $info) {
        $sources = [];
        foreach($info['sources'] as $type => $path) {
            $sources[] = [
                'format' => FTM_LEGACY_SOUND_TYPE[$type],
                'url' => $path,
            ];
        }

        $library[] = [
            'id' => $name,
            'name' => $info['title'],
            'sources' => $sources,
        ];
    }

    $packs = [];
    foreach($sndPacks as $name => $info)
        $packs[] = [
            'id' => $name,
            'name' => $info['title'],
            'events' => $info['events'],
        ];

    json_out(compact('library', 'packs'));
}

if(preg_match('#^/texttriggers(\.[a-f0-9]{8})?.json$#', $reqPath)) {
    etag_file('texttriggers', FTM_TEXT_TRIGGERS);

    $triggers = parse_ini_file(FTM_TEXT_TRIGGERS, true, INI_SCANNER_TYPED);

    if($triggers === false)
        $triggers = [];
    else
        $triggers = array_values($triggers);

    json_out($triggers);
}

if(preg_match('#^/soundtriggers(\.[a-f0-9]{8})?.json$#', $reqPath)) {
    etag_file('soundtriggers', FTM_TEXT_TRIGGERS);

    $textTriggers = parse_ini_file(FTM_TEXT_TRIGGERS, true, INI_SCANNER_TYPED);
    $sndLib = parse_ini_file(FTM_SOUND_LIBRARY, true, INI_SCANNER_TYPED);
    $soundTrigs = [];

    foreach($textTriggers as $triggerInfo) {
        if($triggerInfo['type'] !== 'sound' && $triggerInfo['type'] !== 'alias')
            continue;

        $soundTrig = [];

        if($triggerInfo['type'] === 'sound') {
            $sounds = [];

            foreach($triggerInfo['sounds'] as $soundName) {
                if(!isset($sndLib[$soundName]))
                    continue;

                $sound = [];
                $libSound = $sndLib[$soundName];

                if(isset($libSound['sources']['mp3']))
                    $sound['m'] = $libSound['sources']['mp3'];
                if(isset($libSound['sources']['ogg']))
                    $sound['o'] = $libSound['sources']['ogg'];
                if(isset($libSound['sources']['opus']))
                    $sound['o'] = $libSound['sources']['opus'];
                if(isset($libSound['sources']['caf']))
                    $sound['c'] = $libSound['sources']['caf'];

                if(empty($sound))
                    continue;

                if(isset($triggerInfo['volume'])) {
                    $sound['v'] = ceil(($triggerInfo['volume'] - 1) * 100);
                    $sound['v2'] = $triggerInfo['volume'];
                }

                if(isset($triggerInfo['rate']))
                    $sound['r'] = $triggerInfo['rate'];

                $sounds[] = $sound;
            }

            $soundTrig['s'] = $sounds;
        } elseif($triggerInfo['type'] === 'alias') {
            $soundTrig['f'] = $triggerInfo['for'];
        }

        $matches = [];
        foreach($triggerInfo['match'] as $match) {
            $filters = [];
            $value = null;
            $notValue = null;

            $parts = explode(';', $match);
            foreach($parts as $part) {
                $part = explode(':', trim($part));

                switch($part[0]) {
                    case 'lc':
                        $filters[] = 'lower';
                        break;
                    case 'is':
                        $filters[] = 'exact';
                        $value = trim($part[1]);
                        break;
                    case 'starts':
                        $filters[] = 'starts';
                        $value = trim($part[1]);
                        break;
                    case 'has':
                        $filters[] = 'contains';
                        $value = trim($part[1]);
                        break;
                    case 'hasnot':
                        $notValue = trim($part[1]);
                        break;
                    default:
                        $filters[] = 'missing:' . $part[0];
                        break;
                }
            }

            $matchNew = ['t' => implode(':', $filters)];
            if($value !== null)
                $matchNew['m'] = $value;
            if($notValue !== null)
                $matchNew['n'] = $notValue;

            $matches[] = $matchNew;
        }
        $soundTrig['t'] = $matches;

        $soundTrigs[] = $soundTrig;
    }

    json_out([
        'meta' => [
            'baseUrl' => '',
        ],
        'triggers' => $soundTrigs,
    ]);
}

if($reqPath === '/' || $reqPath === '/index.html' || $reqPath === '/index.php') {
    header('Content-Type: text/html; charset=utf-8');
    echo <<<HTML
    <!doctype html>
    Data and settings shared between both chat clients is stored on this subdomain.
    HTML;
    return;
}

http_response_code(404);