<?php

function env_value(string $key, string $default = ''): string
{
    $value = getenv($key);
    if ($value !== false && $value !== '') {
        return $value;
    }

    static $fileVars = null;
    if ($fileVars === null) {
        $fileVars = is_file(__DIR__.'/../.env')
            ? parse_ini_file(__DIR__.'/../.env', false, INI_SCANNER_RAW)
            : [];
    }

    return isset($fileVars[$key]) && $fileVars[$key] !== ''
        ? (string) $fileVars[$key]
        : $default;
}

$host = env_value('DB_HOST', '127.0.0.1');
$port = env_value('DB_PORT', '3306');
$database = env_value('DB_DATABASE', 'spbu_baru');
$username = env_value('DB_USERNAME', 'root');
$password = env_value('DB_PASSWORD', '');
$dsn = "mysql:host={$host};port={$port};dbname={$database};charset=utf8mb4";

echo "Waiting for database at {$host}:{$port}...\n";

for ($attempt = 1; $attempt <= 30; $attempt++) {
    try {
        new PDO($dsn, $username, $password, [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_TIMEOUT => 3,
        ]);

        echo "Database connection OK.\n";
        exit(0);
    } catch (PDOException $exception) {
        if ($attempt === 30) {
            fwrite(STDERR, "Database unreachable after 30 attempts: {$exception->getMessage()}\n");
            exit(1);
        }

        sleep(2);
    }
}