<?php
declare(strict_types=1);

/*
 * SFU signaling bootstrap — minimal standalone setup.
 * Reuses the composed BE database and session if available,
 * otherwise falls back to own PDO from environment.
 */

define('SFU_ROOT', dirname(__DIR__));

/* ── autoloader ───────────────────────────────────────────────────── */
spl_autoload_register(static function (string $class): void {
    $prefix = 'AndroidCast\\Sfu\\';
    if (str_starts_with($class, $prefix)) {
        $rel  = str_replace('\\', '/', substr($class, strlen($prefix)));
        $file = SFU_ROOT . '/src/' . $rel . '.php';
        if (is_file($file)) {
            require_once $file;
        }
    }
});

/* ── configuration ────────────────────────────────────────────────── */

function sfuConfig(string $key, mixed $default = null): mixed
{
    static $cfg = null;
    if ($cfg === null) {
        $cfgFile = SFU_ROOT . '/config/config.php';
        $cfg = is_file($cfgFile) ? (require $cfgFile) : [];
        /* Env overrides */
        if (getenv('JANUS_URL') !== false) {
            $cfg['janus_url'] = getenv('JANUS_URL');
        }
        if (getenv('DB_DSN') !== false) {
            $cfg['db_dsn'] = getenv('DB_DSN');
        }
    }
    return $cfg[$key] ?? $default;
}

/* ── PDO ────────────────────────────────────────────────────────────── */

function sfuPdo(): \PDO
{
    static $pdo = null;
    if ($pdo === null) {
        /* Prefer composed BE PDO if already bootstrapped */
        $composedBe = '/var/www/ac/composed/backend/src/bootstrap.php';
        if (is_file($composedBe)) {
            require_once $composedBe;
            if (function_exists('db')) {
                $pdo = db();
                return $pdo;
            }
        }
        /* Fall back to own DSN */
        $dsn  = sfuConfig('db_dsn', 'mysql:host=cast01;dbname=androidcast;charset=utf8mb4');
        $user = sfuConfig('db_user', 'androidcast');
        $pass = sfuConfig('db_pass', '');
        $pdo  = new \PDO($dsn, $user, $pass, [
            \PDO::ATTR_ERRMODE            => \PDO::ERRMODE_EXCEPTION,
            \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
        ]);
    }
    return $pdo;
}

/* ── Janus client ────────────────────────────────────────────────── */

function janusClient(): \AndroidCast\Sfu\JanusClient
{
    static $client = null;
    if ($client === null) {
        $url    = sfuConfig('janus_url', 'http://10.7.16.237:8088/janus');
        $client = new \AndroidCast\Sfu\JanusClient($url);
    }
    return $client;
}

/* ── Auth helper ─────────────────────────────────────────────────── */

function sfuRequireAuth(): array
{
    /* Try composed BE session */
    $composedBe = '/var/www/ac/composed/backend/src/bootstrap.php';
    if (is_file($composedBe)) {
        require_once $composedBe;
        if (function_exists('requireAuth')) {
            return requireAuth();
        }
    }
    /* Minimal cookie/bearer check */
    session_start();
    if (empty($_SESSION['user_id'])) {
        http_response_code(401);
        echo json_encode(['ok' => false, 'error' => 'unauthorized']);
        exit;
    }
    return ['id' => (int) $_SESSION['user_id'], 'email' => $_SESSION['email'] ?? ''];
}

/* ── JSON helpers ────────────────────────────────────────────────── */

function sfuJsonOk(array $data = []): void
{
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['ok' => true] + $data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    exit;
}

function sfuJsonErr(string $message, int $code = 400): void
{
    http_response_code($code);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['ok' => false, 'error' => $message], JSON_UNESCAPED_SLASHES);
    exit;
}