<?php
declare(strict_types=1);

final class AdminerRuntimeConfig
{
    private const FILE_NAME = 'config.json';

    public static function sync(Settings $settings, string $pluginErrorLog = ''): void
    {
        $runtimeDir = rtrim($settings->adminerSsoDir(), '/');
        if ($runtimeDir === '' || !is_dir($runtimeDir)) {
            return;
        }

        if (!is_writable($runtimeDir)) {
            self::log($pluginErrorLog, 'Adminer runtime dir is not writable: ' . $runtimeDir);
            return;
        }

        $payload = [
            'version' => 1,
            'adminer_public' => ($settings->enableAdminer() && $settings->adminerPublic()),
            'updated_at' => time(),
        ];

        $encoded = json_encode($payload, JSON_UNESCAPED_SLASHES);
        if (!is_string($encoded) || $encoded === '') {
            self::log($pluginErrorLog, 'Failed to encode Adminer runtime config JSON.');
            return;
        }

        $targetPath = $runtimeDir . '/' . self::FILE_NAME;
        $tempPath = $runtimeDir . '/.' . self::FILE_NAME . '.' . getmypid() . '.tmp';

        $written = @file_put_contents($tempPath, $encoded, LOCK_EX);
        if ($written === false) {
            self::log($pluginErrorLog, 'Failed to write temporary Adminer runtime config: ' . $tempPath);
            return;
        }

        @chmod($tempPath, 0644);

        if (!@rename($tempPath, $targetPath)) {
            @unlink($tempPath);
            self::log($pluginErrorLog, 'Failed to replace Adminer runtime config: ' . $targetPath);
            return;
        }

        @chmod($targetPath, 0644);
    }

    private static function log(string $pluginErrorLog, string $message): void
    {
        if ($pluginErrorLog === '') {
            return;
        }

        $line = sprintf("[%s] ADMINER_RUNTIME_CONFIG %s\n", date('c'), $message);
        @error_log($line, 3, $pluginErrorLog);
    }
}